Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 4318 insertions, 0 deletions

diff --git a/libreofficekit/source/gtk/lokdocview.cxx b/libreofficekit/source/gtk/lokdocview.cxx
new file mode 100644
index 000000000..75deee7a3
--- /dev/null
+++ b/libreofficekit/source/gtk/lokdocview.cxx
@@ -0,0 +1,3901 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <sal/types.h>
+#include <math.h>
+#include <string.h>
+#include <memory>
+#include <vector>
+#include <string>
+#include <sstream>
+#include <iostream>
+#include <mutex>
+#include <boost/property_tree/json_parser.hpp>
+
+#include <com/sun/star/awt/Key.hpp>
+#include <LibreOfficeKit/LibreOfficeKit.h>
+#include <LibreOfficeKit/LibreOfficeKitInit.h>
+#include <LibreOfficeKit/LibreOfficeKitEnums.h>
+#include <LibreOfficeKit/LibreOfficeKitGtk.h>
+#include <vcl/event.hxx>
+
+#include "tilebuffer.hxx"
+
+#if !GLIB_CHECK_VERSION(2,32,0)
+#define G_SOURCE_REMOVE FALSE
+#define G_SOURCE_CONTINUE TRUE
+#endif
+#if !GLIB_CHECK_VERSION(2,40,0)
+#define g_info(...) g_log(G_LOG_DOMAIN, G_LOG_LEVEL_INFO, __VA_ARGS__)
+#endif
+
+// Cursor bitmaps from the installation set.
+#define CURSOR_HANDLE_DIR "/../share/libreofficekit/"
+// Number of handles around a graphic selection.
+#define GRAPHIC_HANDLE_COUNT 8
+// Maximum Zoom allowed
+#define MAX_ZOOM 5.0f
+// Minimum Zoom allowed
+#define MIN_ZOOM 0.25f
+
+/// This is expected to be locked during setView(), doSomethingElse() LOK calls.
+static std::mutex g_aLOKMutex;
+
+namespace {
+
+/// Same as a GdkRectangle, but also tracks in which part the rectangle is.
+struct ViewRectangle
+{
+    int m_nPart;
+    GdkRectangle m_aRectangle;
+
+    ViewRectangle(int nPart = 0, const GdkRectangle& rRectangle = GdkRectangle())
+        : m_nPart(nPart),
+        m_aRectangle(rRectangle)
+    {
+    }
+};
+
+/// Same as a list of GdkRectangles, but also tracks in which part the rectangle is.
+struct ViewRectangles
+{
+    int m_nPart;
+    std::vector<GdkRectangle> m_aRectangles;
+
+    ViewRectangles(int nPart = 0, const std::vector<GdkRectangle>& rRectangles = std::vector<GdkRectangle>())
+        : m_nPart(nPart),
+        m_aRectangles(rRectangles)
+    {
+    }
+};
+
+/// Private struct used by this GObject type
+struct LOKDocViewPrivateImpl
+{
+    std::string m_aLOPath;
+    std::string m_aUserProfileURL;
+    std::string m_aDocPath;
+    std::string m_aRenderingArguments;
+    gdouble m_nLoadProgress;
+    bool m_bIsLoading;
+    bool m_bInit; // initializeForRendering() has been called
+    bool m_bCanZoomIn;
+    bool m_bCanZoomOut;
+    bool m_bUnipoll;
+    LibreOfficeKit* m_pOffice;
+    LibreOfficeKitDocument* m_pDocument;
+
+    std::unique_ptr<TileBuffer> m_pTileBuffer;
+    GThreadPool* lokThreadPool;
+
+    gfloat m_fZoom;
+    glong m_nDocumentWidthTwips;
+    glong m_nDocumentHeightTwips;
+    /// View or edit mode.
+    bool m_bEdit;
+    /// LOK Features
+    guint64 m_nLOKFeatures;
+    /// Number of parts in currently loaded document
+    gint m_nParts;
+    /// Position and size of the visible cursor.
+    GdkRectangle m_aVisibleCursor;
+    /// Position and size of the view cursors. The current view can only see
+    /// them, can't modify them. Key is the view id.
+    std::map<int, ViewRectangle> m_aViewCursors;
+    /// Cursor overlay is visible or hidden (for blinking).
+    bool m_bCursorOverlayVisible;
+    /// Cursor is visible or hidden (e.g. for graphic selection).
+    bool m_bCursorVisible;
+    /// Visibility of view selections. The current view can only see / them,
+    /// can't modify them. Key is the view id.
+    std::map<int, bool> m_aViewCursorVisibilities;
+    /// Time of the last button press.
+    guint32 m_nLastButtonPressTime;
+    /// Time of the last button release.
+    guint32 m_nLastButtonReleaseTime;
+    /// Last pressed button (left, right, middle)
+    guint32 m_nLastButtonPressed;
+    /// Key modifier (ctrl, atl, shift)
+    guint32 m_nKeyModifier;
+    /// Rectangles of the current text selection.
+    std::vector<GdkRectangle> m_aTextSelectionRectangles;
+    /// Rectangles of view selections. The current view can only see
+    /// them, can't modify them. Key is the view id.
+    std::map<int, ViewRectangles> m_aTextViewSelectionRectangles;
+    /// Position and size of the selection start (as if there would be a cursor caret there).
+    GdkRectangle m_aTextSelectionStart;
+    /// Position and size of the selection end.
+    GdkRectangle m_aTextSelectionEnd;
+    GdkRectangle m_aGraphicSelection;
+    /// Position and size of the graphic view selections. The current view can only
+    /// see them, can't modify them. Key is the view id.
+    std::map<int, ViewRectangle> m_aGraphicViewSelections;
+    GdkRectangle m_aCellCursor;
+    /// Position and size of the cell view cursors. The current view can only
+    /// see them, can't modify them. Key is the view id.
+    std::map<int, ViewRectangle> m_aCellViewCursors;
+    bool m_bInDragGraphicSelection;
+    /// Position, size and color of the reference marks. The current view can only
+    /// see them, can't modify them. Key is the view id.
+    std::vector<std::pair<ViewRectangle, sal_uInt32>> m_aReferenceMarks;
+
+    /// @name Start/middle/end handle.
+    ///@{
+    /// Bitmap of the text selection start handle.
+    cairo_surface_t* m_pHandleStart;
+    /// Rectangle of the text selection start handle, to know if the user clicked on it or not
+    GdkRectangle m_aHandleStartRect;
+    /// If we are in the middle of a drag of the text selection end handle.
+    bool m_bInDragStartHandle;
+    /// Bitmap of the text selection middle handle.
+    cairo_surface_t* m_pHandleMiddle;
+    /// Rectangle of the text selection middle handle, to know if the user clicked on it or not
+    GdkRectangle m_aHandleMiddleRect;
+    /// If we are in the middle of a drag of the text selection middle handle.
+    bool m_bInDragMiddleHandle;
+    /// Bitmap of the text selection end handle.
+    cairo_surface_t* m_pHandleEnd;
+    /// Rectangle of the text selection end handle, to know if the user clicked on it or not
+    GdkRectangle m_aHandleEndRect;
+    /// If we are in the middle of a drag of the text selection end handle.
+    bool m_bInDragEndHandle;
+    ///@}
+
+    /// @name Graphic handles.
+    ///@{
+    /// Rectangle of a graphic selection handle, to know if the user clicked on it or not.
+    GdkRectangle m_aGraphicHandleRects[8];
+    /// If we are in the middle of a drag of a graphic selection handle.
+    bool m_bInDragGraphicHandles[8];
+    ///@}
+
+    /// View ID, returned by createView() or 0 by default.
+    int m_nViewId;
+
+    /// Cached part ID, returned by getPart().
+    int m_nPartId;
+
+    /// Cached document type, returned by getDocumentType().
+    LibreOfficeKitDocumentType m_eDocumentType;
+
+    /// Contains a freshly set zoom level: logic size of a tile.
+    /// It gets reset back to 0 when LOK was informed about this zoom change.
+    int m_nTileSizeTwips;
+
+    GdkRectangle m_aVisibleArea;
+    bool m_bVisibleAreaSet;
+
+    /// Event source ID for handleTimeout() of this widget.
+    guint m_nTimeoutId;
+
+    /// Rectangles of view locks. The current view can only see
+    /// them, can't modify them. Key is the view id.
+    std::map<int, ViewRectangle> m_aViewLockRectangles;
+
+    LOKDocViewPrivateImpl()
+        : m_nLoadProgress(0),
+        m_bIsLoading(false),
+        m_bInit(false),
+        m_bCanZoomIn(true),
+        m_bCanZoomOut(true),
+        m_bUnipoll(false),
+        m_pOffice(nullptr),
+        m_pDocument(nullptr),
+        lokThreadPool(nullptr),
+        m_fZoom(0),
+        m_nDocumentWidthTwips(0),
+        m_nDocumentHeightTwips(0),
+        m_bEdit(false),
+        m_nLOKFeatures(0),
+        m_nParts(0),
+        m_aVisibleCursor({0, 0, 0, 0}),
+        m_bCursorOverlayVisible(false),
+        m_bCursorVisible(true),
+        m_nLastButtonPressTime(0),
+        m_nLastButtonReleaseTime(0),
+        m_nLastButtonPressed(0),
+        m_nKeyModifier(0),
+        m_aTextSelectionStart({0, 0, 0, 0}),
+        m_aTextSelectionEnd({0, 0, 0, 0}),
+        m_aGraphicSelection({0, 0, 0, 0}),
+        m_aCellCursor({0, 0, 0, 0}),
+        m_bInDragGraphicSelection(false),
+        m_pHandleStart(nullptr),
+        m_aHandleStartRect({0, 0, 0, 0}),
+        m_bInDragStartHandle(false),
+        m_pHandleMiddle(nullptr),
+        m_aHandleMiddleRect({0, 0, 0, 0}),
+        m_bInDragMiddleHandle(false),
+        m_pHandleEnd(nullptr),
+        m_aHandleEndRect({0, 0, 0, 0}),
+        m_bInDragEndHandle(false),
+        m_nViewId(0),
+        m_nPartId(0),
+        m_eDocumentType(LOK_DOCTYPE_OTHER),
+        m_nTileSizeTwips(0),
+        m_aVisibleArea({0, 0, 0, 0}),
+        m_bVisibleAreaSet(false),
+        m_nTimeoutId(0)
+    {
+        memset(&m_aGraphicHandleRects, 0, sizeof(m_aGraphicHandleRects));
+        memset(&m_bInDragGraphicHandles, 0, sizeof(m_bInDragGraphicHandles));
+    }
+
+    ~LOKDocViewPrivateImpl()
+    {
+        if (m_nTimeoutId)
+            g_source_remove(m_nTimeoutId);
+    }
+};
+
+}
+
+/// Wrapper around LOKDocViewPrivateImpl, managed by malloc/memset/free.
+struct _LOKDocViewPrivate
+{
+    LOKDocViewPrivateImpl* m_pImpl;
+
+    LOKDocViewPrivateImpl* operator->()
+    {
+        return m_pImpl;
+    }
+};
+
+enum
+{
+    LOAD_CHANGED,
+    EDIT_CHANGED,
+    COMMAND_CHANGED,
+    SEARCH_NOT_FOUND,
+    PART_CHANGED,
+    SIZE_CHANGED,
+    HYPERLINK_CLICKED,
+    CURSOR_CHANGED,
+    SEARCH_RESULT_COUNT,
+    COMMAND_RESULT,
+    ADDRESS_CHANGED,
+    FORMULA_CHANGED,
+    TEXT_SELECTION,
+    PASSWORD_REQUIRED,
+    COMMENT,
+    RULER,
+    WINDOW,
+    INVALIDATE_HEADER,
+
+    LAST_SIGNAL
+};
+
+enum
+{
+    PROP_0,
+
+    PROP_LO_PATH,
+    PROP_LO_UNIPOLL,
+    PROP_LO_POINTER,
+    PROP_USER_PROFILE_URL,
+    PROP_DOC_PATH,
+    PROP_DOC_POINTER,
+    PROP_EDITABLE,
+    PROP_LOAD_PROGRESS,
+    PROP_ZOOM,
+    PROP_IS_LOADING,
+    PROP_IS_INITIALIZED,
+    PROP_DOC_WIDTH,
+    PROP_DOC_HEIGHT,
+    PROP_CAN_ZOOM_IN,
+    PROP_CAN_ZOOM_OUT,
+    PROP_DOC_PASSWORD,
+    PROP_DOC_PASSWORD_TO_MODIFY,
+    PROP_TILED_ANNOTATIONS,
+
+    PROP_LAST
+};
+
+static guint doc_view_signals[LAST_SIGNAL] = { 0 };
+static GParamSpec *properties[PROP_LAST] = { nullptr };
+
+static void lok_doc_view_initable_iface_init (GInitableIface *iface);
+static void callbackWorker (int nType, const char* pPayload, void* pData);
+static void updateClientZoom (LOKDocView *pDocView);
+
+SAL_DLLPUBLIC_EXPORT GType lok_doc_view_get_type();
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+#if defined __clang__
+#if __has_warning("-Wdeprecated-volatile")
+#pragma clang diagnostic ignored "-Wdeprecated-volatile"
+#endif
+#endif
+#endif
+G_DEFINE_TYPE_WITH_CODE (LOKDocView, lok_doc_view, GTK_TYPE_DRAWING_AREA,
+                         G_ADD_PRIVATE (LOKDocView)
+                         G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, lok_doc_view_initable_iface_init));
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
+static LOKDocViewPrivate& getPrivate(LOKDocView* pDocView)
+{
+    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private(pDocView));
+    return *priv;
+}
+
+namespace {
+
+/// Helper struct used to pass the data from soffice thread -> main thread.
+struct CallbackData
+{
+    int m_nType;
+    std::string m_aPayload;
+    LOKDocView* m_pDocView;
+
+    CallbackData(int nType, const std::string& rPayload, LOKDocView* pDocView)
+        : m_nType(nType),
+          m_aPayload(rPayload),
+          m_pDocView(pDocView) {}
+};
+
+}
+
+static void
+LOKPostCommand (LOKDocView* pDocView,
+                const gchar* pCommand,
+                const gchar* pArguments,
+                bool bNotifyWhenFinished)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+    LOEvent* pLOEvent = new LOEvent(LOK_POST_COMMAND);
+    GError* error = nullptr;
+    pLOEvent->m_pCommand = g_strdup(pCommand);
+    pLOEvent->m_pArguments  = g_strdup(pArguments);
+    pLOEvent->m_bNotifyWhenFinished = bNotifyWhenFinished;
+
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_POST_COMMAND: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+}
+
+static void
+doSearch(LOKDocView* pDocView, const char* pText, bool bBackwards, bool highlightAll)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return;
+
+    boost::property_tree::ptree aTree;
+    GtkWidget* drawingWidget = GTK_WIDGET(pDocView);
+    GdkWindow* drawingWindow = gtk_widget_get_window(drawingWidget);
+    if (!drawingWindow)
+        return;
+    std::shared_ptr<cairo_region_t> cairoVisRegion( gdk_window_get_visible_region(drawingWindow),
+                                                    cairo_region_destroy);
+    cairo_rectangle_int_t cairoVisRect;
+    cairo_region_get_rectangle(cairoVisRegion.get(), 0, &cairoVisRect);
+    int x = pixelToTwip (cairoVisRect.x, priv->m_fZoom);
+    int y = pixelToTwip (cairoVisRect.y, priv->m_fZoom);
+
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.SearchString/type", '/'), "string");
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.SearchString/value", '/'), pText);
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.Backward/type", '/'), "boolean");
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.Backward/value", '/'), bBackwards);
+    if (highlightAll)
+    {
+        aTree.put(boost::property_tree::ptree::path_type("SearchItem.Command/type", '/'), "unsigned short");
+        // SvxSearchCmd::FIND_ALL
+        aTree.put(boost::property_tree::ptree::path_type("SearchItem.Command/value", '/'), "1");
+    }
+
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.SearchStartPointX/type", '/'), "long");
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.SearchStartPointX/value", '/'), x);
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.SearchStartPointY/type", '/'), "long");
+    aTree.put(boost::property_tree::ptree::path_type("SearchItem.SearchStartPointY/value", '/'), y);
+
+    std::stringstream aStream;
+    boost::property_tree::write_json(aStream, aTree);
+
+    LOKPostCommand (pDocView, ".uno:ExecuteSearch", aStream.str().c_str(), false);
+}
+
+static bool
+isEmptyRectangle(const GdkRectangle& rRectangle)
+{
+    return rRectangle.x == 0 && rRectangle.y == 0 && rRectangle.width == 0 && rRectangle.height == 0;
+}
+
+/// if handled, returns TRUE else FALSE
+static bool
+handleTextSelectionOnButtonPress(GdkRectangle& aClick, LOKDocView* pDocView) {
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    if (gdk_rectangle_intersect(&aClick, &priv->m_aHandleStartRect, nullptr))
+    {
+        g_info("LOKDocView_Impl::signalButton: start of drag start handle");
+        priv->m_bInDragStartHandle = true;
+        return true;
+    }
+    else if (gdk_rectangle_intersect(&aClick, &priv->m_aHandleMiddleRect, nullptr))
+    {
+        g_info("LOKDocView_Impl::signalButton: start of drag middle handle");
+        priv->m_bInDragMiddleHandle = true;
+        return true;
+    }
+    else if (gdk_rectangle_intersect(&aClick, &priv->m_aHandleEndRect, nullptr))
+    {
+        g_info("LOKDocView_Impl::signalButton: start of drag end handle");
+        priv->m_bInDragEndHandle = true;
+        return true;
+    }
+
+    return false;
+}
+
+/// if handled, returns TRUE else FALSE
+static bool
+handleGraphicSelectionOnButtonPress(GdkRectangle& aClick, LOKDocView* pDocView) {
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GError* error = nullptr;
+
+    for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
+    {
+        if (gdk_rectangle_intersect(&aClick, &priv->m_aGraphicHandleRects[i], nullptr))
+        {
+            g_info("LOKDocView_Impl::signalButton: start of drag graphic handle #%d", i);
+            priv->m_bInDragGraphicHandles[i] = true;
+
+            GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+            LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
+            pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_START;
+            pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(priv->m_aGraphicHandleRects[i].x + priv->m_aGraphicHandleRects[i].width / 2, priv->m_fZoom);
+            pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(priv->m_aGraphicHandleRects[i].y + priv->m_aGraphicHandleRects[i].height / 2, priv->m_fZoom);
+            g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+            g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+            if (error != nullptr)
+            {
+                g_warning("Unable to call LOK_SET_GRAPHIC_SELECTION: %s", error->message);
+                g_clear_error(&error);
+            }
+            g_object_unref(task);
+
+            return true;
+        }
+    }
+
+    return false;
+}
+
+/// if handled, returns TRUE else FALSE
+static bool
+handleTextSelectionOnButtonRelease(LOKDocView* pDocView) {
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    if (priv->m_bInDragStartHandle)
+    {
+        g_info("LOKDocView_Impl::signalButton: end of drag start handle");
+        priv->m_bInDragStartHandle = false;
+        return true;
+    }
+    else if (priv->m_bInDragMiddleHandle)
+    {
+        g_info("LOKDocView_Impl::signalButton: end of drag middle handle");
+        priv->m_bInDragMiddleHandle = false;
+        return true;
+    }
+    else if (priv->m_bInDragEndHandle)
+    {
+        g_info("LOKDocView_Impl::signalButton: end of drag end handle");
+        priv->m_bInDragEndHandle = false;
+        return true;
+    }
+
+    return false;
+}
+
+/// if handled, returns TRUE else FALSE
+static bool
+handleGraphicSelectionOnButtonRelease(LOKDocView* pDocView, GdkEventButton* pEvent) {
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GError* error = nullptr;
+
+    for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
+    {
+        if (priv->m_bInDragGraphicHandles[i])
+        {
+            g_info("LOKDocView_Impl::signalButton: end of drag graphic handle #%d", i);
+            priv->m_bInDragGraphicHandles[i] = false;
+
+            GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+            LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
+            pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_END;
+            pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(pEvent->x, priv->m_fZoom);
+            pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(pEvent->y, priv->m_fZoom);
+            g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+            g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+            if (error != nullptr)
+            {
+                g_warning("Unable to call LOK_SET_GRAPHIC_SELECTION: %s", error->message);
+                g_clear_error(&error);
+            }
+            g_object_unref(task);
+
+            return true;
+        }
+    }
+
+    if (priv->m_bInDragGraphicSelection)
+    {
+        g_info("LOKDocView_Impl::signalButton: end of drag graphic selection");
+        priv->m_bInDragGraphicSelection = false;
+
+        GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+        LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
+        pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_END;
+        pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(pEvent->x, priv->m_fZoom);
+        pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(pEvent->y, priv->m_fZoom);
+        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+        if (error != nullptr)
+        {
+            g_warning("Unable to call LOK_SET_GRAPHIC_SELECTION: %s", error->message);
+            g_clear_error(&error);
+        }
+        g_object_unref(task);
+
+        return true;
+    }
+
+    return false;
+}
+
+static void
+postKeyEventInThread(gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    gint nTileSizePixelsScaled = nTileSizePixels * nScaleFactor;
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+
+    if (priv->m_nTileSizeTwips)
+    {
+        ss.str(std::string());
+        ss << "lok::Document::setClientZoom(" << nTileSizePixelsScaled << ", " << nTileSizePixelsScaled << ", " << priv->m_nTileSizeTwips << ", " << priv->m_nTileSizeTwips << ")";
+        g_info("%s", ss.str().c_str());
+        priv->m_pDocument->pClass->setClientZoom(priv->m_pDocument,
+                                                 nTileSizePixelsScaled,
+                                                 nTileSizePixelsScaled,
+                                                 priv->m_nTileSizeTwips,
+                                                 priv->m_nTileSizeTwips);
+        priv->m_nTileSizeTwips = 0;
+    }
+    if (priv->m_bVisibleAreaSet)
+    {
+        ss.str(std::string());
+        ss << "lok::Document::setClientVisibleArea(" << priv->m_aVisibleArea.x << ", " << priv->m_aVisibleArea.y << ", ";
+        ss << priv->m_aVisibleArea.width << ", " << priv->m_aVisibleArea.height << ")";
+        g_info("%s", ss.str().c_str());
+        priv->m_pDocument->pClass->setClientVisibleArea(priv->m_pDocument,
+                                                        priv->m_aVisibleArea.x,
+                                                        priv->m_aVisibleArea.y,
+                                                        priv->m_aVisibleArea.width,
+                                                        priv->m_aVisibleArea.height);
+        priv->m_bVisibleAreaSet = false;
+    }
+
+    ss.str(std::string());
+    ss << "lok::Document::postKeyEvent(" << pLOEvent->m_nKeyEvent << ", " << pLOEvent->m_nCharCode << ", " << pLOEvent->m_nKeyCode << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->postKeyEvent(priv->m_pDocument,
+                                            pLOEvent->m_nKeyEvent,
+                                            pLOEvent->m_nCharCode,
+                                            pLOEvent->m_nKeyCode);
+}
+
+static gboolean
+signalKey (GtkWidget* pWidget, GdkEventKey* pEvent)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW(pWidget);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    int nCharCode = 0;
+    int nKeyCode = 0;
+    GError* error = nullptr;
+
+    if (!priv->m_bEdit)
+    {
+        g_info("signalKey: not in edit mode, ignore");
+        return FALSE;
+    }
+
+    priv->m_nKeyModifier &= KEY_MOD2;
+    switch (pEvent->keyval)
+    {
+    case GDK_KEY_BackSpace:
+        nKeyCode = com::sun::star::awt::Key::BACKSPACE;
+        break;
+    case GDK_KEY_Delete:
+        nKeyCode = com::sun::star::awt::Key::DELETE;
+        break;
+    case GDK_KEY_Return:
+    case GDK_KEY_KP_Enter:
+        nKeyCode = com::sun::star::awt::Key::RETURN;
+        break;
+    case GDK_KEY_Escape:
+        nKeyCode = com::sun::star::awt::Key::ESCAPE;
+        break;
+    case GDK_KEY_Tab:
+        nKeyCode = com::sun::star::awt::Key::TAB;
+        break;
+    case GDK_KEY_Down:
+        nKeyCode = com::sun::star::awt::Key::DOWN;
+        break;
+    case GDK_KEY_Up:
+        nKeyCode = com::sun::star::awt::Key::UP;
+        break;
+    case GDK_KEY_Left:
+        nKeyCode = com::sun::star::awt::Key::LEFT;
+        break;
+    case GDK_KEY_Right:
+        nKeyCode = com::sun::star::awt::Key::RIGHT;
+        break;
+    case GDK_KEY_Page_Down:
+        nKeyCode = com::sun::star::awt::Key::PAGEDOWN;
+        break;
+    case GDK_KEY_Page_Up:
+        nKeyCode = com::sun::star::awt::Key::PAGEUP;
+        break;
+    case GDK_KEY_Insert:
+        nKeyCode = com::sun::star::awt::Key::INSERT;
+        break;
+    case GDK_KEY_Shift_L:
+    case GDK_KEY_Shift_R:
+        if (pEvent->type == GDK_KEY_PRESS)
+            priv->m_nKeyModifier |= KEY_SHIFT;
+        break;
+    case GDK_KEY_Control_L:
+    case GDK_KEY_Control_R:
+        if (pEvent->type == GDK_KEY_PRESS)
+            priv->m_nKeyModifier |= KEY_MOD1;
+        break;
+    case GDK_KEY_Alt_L:
+    case GDK_KEY_Alt_R:
+        if (pEvent->type == GDK_KEY_PRESS)
+            priv->m_nKeyModifier |= KEY_MOD2;
+        else
+            priv->m_nKeyModifier &= ~KEY_MOD2;
+        break;
+    default:
+        if (pEvent->keyval >= GDK_KEY_F1 && pEvent->keyval <= GDK_KEY_F26)
+            nKeyCode = com::sun::star::awt::Key::F1 + (pEvent->keyval - GDK_KEY_F1);
+        else
+            nCharCode = gdk_keyval_to_unicode(pEvent->keyval);
+    }
+
+    // rsc is not public API, but should be good enough for debugging purposes.
+    // If this is needed for real, then probably a new param of type
+    // css::awt::KeyModifier is needed in postKeyEvent().
+    if (pEvent->state & GDK_SHIFT_MASK)
+        nKeyCode |= KEY_SHIFT;
+
+    if (pEvent->state & GDK_CONTROL_MASK)
+        nKeyCode |= KEY_MOD1;
+
+    if (priv->m_nKeyModifier & KEY_MOD2)
+        nKeyCode |= KEY_MOD2;
+
+    if (nKeyCode & (KEY_SHIFT | KEY_MOD1 | KEY_MOD2)) {
+        if (pEvent->keyval >= GDK_KEY_a && pEvent->keyval <= GDK_KEY_z)
+        {
+            nKeyCode |= 512 + (pEvent->keyval - GDK_KEY_a);
+        }
+        else if (pEvent->keyval >= GDK_KEY_A && pEvent->keyval <= GDK_KEY_Z) {
+                nKeyCode |= 512 + (pEvent->keyval - GDK_KEY_A);
+        }
+        else if (pEvent->keyval >= GDK_KEY_0 && pEvent->keyval <= GDK_KEY_9) {
+                nKeyCode |= 256 + (pEvent->keyval - GDK_KEY_0);
+        }
+    }
+
+    GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+    LOEvent* pLOEvent = new LOEvent(LOK_POST_KEY);
+    pLOEvent->m_nKeyEvent = pEvent->type == GDK_KEY_RELEASE ? LOK_KEYEVENT_KEYUP : LOK_KEYEVENT_KEYINPUT;
+    pLOEvent->m_nCharCode = nCharCode;
+    pLOEvent->m_nKeyCode  = nKeyCode;
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_POST_KEY: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+
+    return FALSE;
+}
+
+static gboolean
+handleTimeout (gpointer pData)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (pData);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    if (priv->m_bEdit)
+    {
+        if (priv->m_bCursorOverlayVisible)
+            priv->m_bCursorOverlayVisible = false;
+        else
+            priv->m_bCursorOverlayVisible = true;
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+    }
+
+    return G_SOURCE_CONTINUE;
+}
+
+static void
+commandChanged(LOKDocView* pDocView, const std::string& rString)
+{
+    g_signal_emit(pDocView, doc_view_signals[COMMAND_CHANGED], 0, rString.c_str());
+}
+
+static void
+searchNotFound(LOKDocView* pDocView, const std::string& rString)
+{
+    g_signal_emit(pDocView, doc_view_signals[SEARCH_NOT_FOUND], 0, rString.c_str());
+}
+
+static void searchResultCount(LOKDocView* pDocView, const std::string& rString)
+{
+    g_signal_emit(pDocView, doc_view_signals[SEARCH_RESULT_COUNT], 0, rString.c_str());
+}
+
+static void commandResult(LOKDocView* pDocView, const std::string& rString)
+{
+    g_signal_emit(pDocView, doc_view_signals[COMMAND_RESULT], 0, rString.c_str());
+}
+
+static void addressChanged(LOKDocView* pDocView, const std::string& rString)
+{
+    g_signal_emit(pDocView, doc_view_signals[ADDRESS_CHANGED], 0, rString.c_str());
+}
+
+static void formulaChanged(LOKDocView* pDocView, const std::string& rString)
+{
+    g_signal_emit(pDocView, doc_view_signals[FORMULA_CHANGED], 0, rString.c_str());
+}
+
+static void reportError(LOKDocView* /*pDocView*/, const std::string& rString)
+{
+    GtkWidget *dialog = gtk_message_dialog_new(nullptr,
+            GTK_DIALOG_DESTROY_WITH_PARENT,
+            GTK_MESSAGE_ERROR,
+            GTK_BUTTONS_CLOSE,
+            "%s",
+            rString.c_str());
+    gtk_dialog_run(GTK_DIALOG(dialog));
+    gtk_widget_destroy(dialog);
+}
+
+static void
+setPart(LOKDocView* pDocView, const std::string& rString)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    priv->m_nPartId = std::stoi(rString);
+    g_signal_emit(pDocView, doc_view_signals[PART_CHANGED], 0, priv->m_nPartId);
+}
+
+static void
+hyperlinkClicked(LOKDocView* pDocView, const std::string& rString)
+{
+    g_signal_emit(pDocView, doc_view_signals[HYPERLINK_CLICKED], 0, rString.c_str());
+}
+
+/// Trigger a redraw, invoked on the main thread by other functions running in a thread.
+static gboolean queueDraw(gpointer pData)
+{
+    GtkWidget* pWidget = static_cast<GtkWidget*>(pData);
+
+    gtk_widget_queue_draw(pWidget);
+
+    return G_SOURCE_REMOVE;
+}
+
+/// Looks up the author string from initializeForRendering()'s rendering arguments.
+static std::string getAuthorRenderingArgument(LOKDocViewPrivate& priv)
+{
+    std::stringstream aStream;
+    aStream << priv->m_aRenderingArguments;
+    boost::property_tree::ptree aTree;
+    boost::property_tree::read_json(aStream, aTree);
+    std::string aRet;
+    for (const auto& rPair : aTree)
+    {
+        if (rPair.first == ".uno:Author")
+        {
+            aRet = rPair.second.get<std::string>("value");
+            break;
+        }
+    }
+    return aRet;
+}
+
+/// Author string <-> View ID map
+static std::map<std::string, int> g_aAuthorViews;
+
+static void refreshSize(LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    priv->m_pDocument->pClass->getDocumentSize(priv->m_pDocument, &priv->m_nDocumentWidthTwips, &priv->m_nDocumentHeightTwips);
+    float zoom = priv->m_fZoom;
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    gint nTileSizePixelsScaled = nTileSizePixels * nScaleFactor;
+    long nDocumentWidthTwips = priv->m_nDocumentWidthTwips;
+    long nDocumentHeightTwips = priv->m_nDocumentHeightTwips;
+    long nDocumentWidthPixels = twipToPixel(nDocumentWidthTwips, zoom);
+    long nDocumentHeightPixels = twipToPixel(nDocumentHeightTwips, zoom);
+
+    // Total number of columns in this document.
+    guint nColumns = ceil(static_cast<double>(nDocumentWidthPixels) / nTileSizePixelsScaled);
+    priv->m_pTileBuffer = std::make_unique<TileBuffer>(nColumns, nScaleFactor);
+    gtk_widget_set_size_request(GTK_WIDGET(pDocView),
+                                nDocumentWidthPixels,
+                                nDocumentHeightPixels);
+}
+
+/// Set up LOKDocView after the document is loaded, invoked on the main thread by openDocumentInThread() running in a thread.
+static gboolean postDocumentLoad(gpointer pData)
+{
+    LOKDocView* pLOKDocView = static_cast<LOKDocView*>(pData);
+    LOKDocViewPrivate& priv = getPrivate(pLOKDocView);
+
+    std::unique_lock<std::mutex> aGuard(g_aLOKMutex);
+    priv->m_pDocument->pClass->initializeForRendering(priv->m_pDocument, priv->m_aRenderingArguments.c_str());
+    priv->m_nViewId = priv->m_pDocument->pClass->getView(priv->m_pDocument);
+    g_aAuthorViews[getAuthorRenderingArgument(priv)] = priv->m_nViewId;
+    priv->m_pDocument->pClass->registerCallback(priv->m_pDocument, callbackWorker, pLOKDocView);
+    priv->m_nParts = priv->m_pDocument->pClass->getParts(priv->m_pDocument);
+    aGuard.unlock();
+    priv->m_nTimeoutId = g_timeout_add(600, handleTimeout, pLOKDocView);
+
+    refreshSize(pLOKDocView);
+
+    gtk_widget_set_can_focus(GTK_WIDGET(pLOKDocView), true);
+    gtk_widget_grab_focus(GTK_WIDGET(pLOKDocView));
+    lok_doc_view_set_zoom(pLOKDocView, 1.0);
+
+    // we are completely loaded
+    priv->m_bInit = true;
+    g_object_notify_by_pspec(G_OBJECT(pLOKDocView), properties[PROP_IS_INITIALIZED]);
+
+    return G_SOURCE_REMOVE;
+}
+
+/// Implementation of the global callback handler, invoked by globalCallback();
+static gboolean
+globalCallback (gpointer pData)
+{
+    CallbackData* pCallback = static_cast<CallbackData*>(pData);
+    LOKDocViewPrivate& priv = getPrivate(pCallback->m_pDocView);
+    bool bModify = false;
+
+    switch (pCallback->m_nType)
+    {
+    case LOK_CALLBACK_STATUS_INDICATOR_START:
+    {
+        priv->m_nLoadProgress = 0.0;
+        g_signal_emit (pCallback->m_pDocView, doc_view_signals[LOAD_CHANGED], 0, 0.0);
+    }
+    break;
+    case LOK_CALLBACK_STATUS_INDICATOR_SET_VALUE:
+    {
+        priv->m_nLoadProgress = static_cast<gdouble>(std::stoi(pCallback->m_aPayload)/100.0);
+        g_signal_emit (pCallback->m_pDocView, doc_view_signals[LOAD_CHANGED], 0, priv->m_nLoadProgress);
+    }
+    break;
+    case LOK_CALLBACK_STATUS_INDICATOR_FINISH:
+    {
+        priv->m_nLoadProgress = 1.0;
+        g_signal_emit (pCallback->m_pDocView, doc_view_signals[LOAD_CHANGED], 0, 1.0);
+    }
+    break;
+    case LOK_CALLBACK_DOCUMENT_PASSWORD_TO_MODIFY:
+        bModify = true;
+        [[fallthrough]];
+    case LOK_CALLBACK_DOCUMENT_PASSWORD:
+    {
+        char const*const pURL(pCallback->m_aPayload.c_str());
+        g_signal_emit (pCallback->m_pDocView, doc_view_signals[PASSWORD_REQUIRED], 0, pURL, bModify);
+    }
+    break;
+    case LOK_CALLBACK_ERROR:
+    {
+        reportError(pCallback->m_pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_SIGNATURE_STATUS:
+    {
+        // TODO
+    }
+    break;
+    default:
+        g_assert(false);
+        break;
+    }
+    delete pCallback;
+
+    return G_SOURCE_REMOVE;
+}
+
+static void
+globalCallbackWorker(int nType, const char* pPayload, void* pData)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (pData);
+
+    CallbackData* pCallback = new CallbackData(nType, pPayload ? pPayload : "(nil)", pDocView);
+    g_info("LOKDocView_Impl::globalCallbackWorkerImpl: %s, '%s'", lokCallbackTypeToString(nType), pPayload);
+    gdk_threads_add_idle(globalCallback, pCallback);
+}
+
+static GdkRectangle
+payloadToRectangle (LOKDocView* pDocView, const char* pPayload)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GdkRectangle aRet;
+    // x, y, width, height, part number.
+    gchar** ppCoordinates = g_strsplit(pPayload, ", ", 5);
+    gchar** ppCoordinate = ppCoordinates;
+
+    aRet.width = aRet.height = aRet.x = aRet.y = 0;
+
+    if (!*ppCoordinate)
+        return aRet;
+    aRet.x = atoi(*ppCoordinate);
+    if (aRet.x < 0)
+        aRet.x = 0;
+    ++ppCoordinate;
+    if (!*ppCoordinate)
+        return aRet;
+    aRet.y = atoi(*ppCoordinate);
+    if (aRet.y < 0)
+        aRet.y = 0;
+    ++ppCoordinate;
+    if (!*ppCoordinate)
+        return aRet;
+    long l = atol(*ppCoordinate);
+    if (l > std::numeric_limits<int>::max())
+        aRet.width = std::numeric_limits<int>::max();
+    else
+        aRet.width = l;
+    if (aRet.x + aRet.width > priv->m_nDocumentWidthTwips)
+        aRet.width = priv->m_nDocumentWidthTwips - aRet.x;
+    ++ppCoordinate;
+    if (!*ppCoordinate)
+        return aRet;
+    l = atol(*ppCoordinate);
+    if (l > std::numeric_limits<int>::max())
+        aRet.height = std::numeric_limits<int>::max();
+    else
+        aRet.height = l;
+    if (aRet.y + aRet.height > priv->m_nDocumentHeightTwips)
+        aRet.height = priv->m_nDocumentHeightTwips - aRet.y;
+    g_strfreev(ppCoordinates);
+
+    return aRet;
+}
+
+static std::vector<GdkRectangle>
+payloadToRectangles(LOKDocView* pDocView, const char* pPayload)
+{
+    std::vector<GdkRectangle> aRet;
+
+    if (g_strcmp0(pPayload, "EMPTY") == 0)
+       return aRet;
+
+    gchar** ppRectangles = g_strsplit(pPayload, "; ", 0);
+    for (gchar** ppRectangle = ppRectangles; *ppRectangle; ++ppRectangle)
+        aRet.push_back(payloadToRectangle(pDocView, *ppRectangle));
+    g_strfreev(ppRectangles);
+
+    return aRet;
+}
+
+
+static void
+setTilesInvalid (LOKDocView* pDocView, const GdkRectangle& rRectangle)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GdkRectangle aRectanglePixels;
+    GdkPoint aStart, aEnd;
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    gint nTileSizePixelsScaled = nTileSizePixels * nScaleFactor;
+
+    aRectanglePixels.x = twipToPixel(rRectangle.x, priv->m_fZoom) * nScaleFactor;
+    aRectanglePixels.y = twipToPixel(rRectangle.y, priv->m_fZoom) * nScaleFactor;
+    aRectanglePixels.width = twipToPixel(rRectangle.width, priv->m_fZoom) * nScaleFactor;
+    aRectanglePixels.height = twipToPixel(rRectangle.height, priv->m_fZoom) * nScaleFactor;
+
+    aStart.x = aRectanglePixels.y / nTileSizePixelsScaled;
+    aStart.y = aRectanglePixels.x / nTileSizePixelsScaled;
+    aEnd.x = (aRectanglePixels.y + aRectanglePixels.height + nTileSizePixelsScaled) / nTileSizePixelsScaled;
+    aEnd.y = (aRectanglePixels.x + aRectanglePixels.width + nTileSizePixelsScaled) / nTileSizePixelsScaled;
+    for (int i = aStart.x; i < aEnd.x; i++)
+    {
+        for (int j = aStart.y; j < aEnd.y; j++)
+        {
+            GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+            priv->m_pTileBuffer->setInvalid(i, j, priv->m_fZoom, task, priv->lokThreadPool);
+            g_object_unref(task);
+        }
+    }
+}
+
+static gboolean
+callback (gpointer pData)
+{
+    CallbackData* pCallback = static_cast<CallbackData*>(pData);
+    LOKDocView* pDocView = LOK_DOC_VIEW (pCallback->m_pDocView);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    //callback registered before the widget was destroyed.
+    //Use existence of lokThreadPool as flag it was torn down
+    if (!priv->lokThreadPool)
+    {
+        delete pCallback;
+        return G_SOURCE_REMOVE;
+    }
+
+    switch (static_cast<LibreOfficeKitCallbackType>(pCallback->m_nType))
+    {
+    case LOK_CALLBACK_INVALIDATE_TILES:
+    {
+        if (pCallback->m_aPayload.compare(0, 5, "EMPTY") != 0) // payload doesn't start with "EMPTY"
+        {
+            GdkRectangle aRectangle = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
+            setTilesInvalid(pDocView, aRectangle);
+        }
+        else
+            priv->m_pTileBuffer->resetAllTiles();
+
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+    }
+    break;
+    case LOK_CALLBACK_INVALIDATE_VISIBLE_CURSOR:
+    {
+
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        const std::string& rRectangle = aTree.get<std::string>("rectangle");
+        int nViewId = aTree.get<int>("viewId");
+
+        priv->m_aVisibleCursor = payloadToRectangle(pDocView, rRectangle.c_str());
+        priv->m_bCursorOverlayVisible = true;
+        std::cerr << nViewId;
+        std::cerr << priv->m_nViewId;
+        if(nViewId == priv->m_nViewId)
+        {
+            g_signal_emit(pDocView, doc_view_signals[CURSOR_CHANGED], 0,
+                      priv->m_aVisibleCursor.x,
+                      priv->m_aVisibleCursor.y,
+                      priv->m_aVisibleCursor.width,
+                      priv->m_aVisibleCursor.height);
+        }
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+    }
+    break;
+    case LOK_CALLBACK_TEXT_SELECTION:
+    {
+        priv->m_aTextSelectionRectangles = payloadToRectangles(pDocView, pCallback->m_aPayload.c_str());
+        bool bIsTextSelected = !priv->m_aTextSelectionRectangles.empty();
+        // In case the selection is empty, then we get no LOK_CALLBACK_TEXT_SELECTION_START/END events.
+        if (!bIsTextSelected)
+        {
+            memset(&priv->m_aTextSelectionStart, 0, sizeof(priv->m_aTextSelectionStart));
+            memset(&priv->m_aHandleStartRect, 0, sizeof(priv->m_aHandleStartRect));
+            memset(&priv->m_aTextSelectionEnd, 0, sizeof(priv->m_aTextSelectionEnd));
+            memset(&priv->m_aHandleEndRect, 0, sizeof(priv->m_aHandleEndRect));
+        }
+        else
+            memset(&priv->m_aHandleMiddleRect, 0, sizeof(priv->m_aHandleMiddleRect));
+
+        g_signal_emit(pDocView, doc_view_signals[TEXT_SELECTION], 0, bIsTextSelected);
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+    }
+    break;
+    case LOK_CALLBACK_TEXT_SELECTION_START:
+    {
+        priv->m_aTextSelectionStart = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
+    }
+    break;
+    case LOK_CALLBACK_TEXT_SELECTION_END:
+    {
+        priv->m_aTextSelectionEnd = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
+    }
+    break;
+    case LOK_CALLBACK_CURSOR_VISIBLE:
+    {
+        priv->m_bCursorVisible = pCallback->m_aPayload == "true";
+    }
+    break;
+    case LOK_CALLBACK_MOUSE_POINTER:
+    {
+        // We do not want the cursor to get changed in view-only mode
+        if (priv->m_bEdit)
+        {
+            // The gtk docs claim that most css cursors should be supported, however
+            // on my system at least this is not true and many cursors are unsupported.
+            // In this case pCursor = null, which results in the default cursor
+            // being set.
+            GdkCursor* pCursor = gdk_cursor_new_from_name(gtk_widget_get_display(GTK_WIDGET(pDocView)),
+                                                          pCallback->m_aPayload.c_str());
+            gdk_window_set_cursor(gtk_widget_get_window(GTK_WIDGET(pDocView)), pCursor);
+        }
+    }
+    break;
+    case LOK_CALLBACK_GRAPHIC_SELECTION:
+    {
+        if (pCallback->m_aPayload != "EMPTY")
+            priv->m_aGraphicSelection = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
+        else
+            memset(&priv->m_aGraphicSelection, 0, sizeof(priv->m_aGraphicSelection));
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+    }
+    break;
+    case LOK_CALLBACK_GRAPHIC_VIEW_SELECTION:
+    {
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        int nViewId = aTree.get<int>("viewId");
+        int nPart = aTree.get<int>("part");
+        const std::string& rRectangle = aTree.get<std::string>("selection");
+        if (rRectangle != "EMPTY")
+            priv->m_aGraphicViewSelections[nViewId] = ViewRectangle(nPart, payloadToRectangle(pDocView, rRectangle.c_str()));
+        else
+        {
+            auto it = priv->m_aGraphicViewSelections.find(nViewId);
+            if (it != priv->m_aGraphicViewSelections.end())
+                priv->m_aGraphicViewSelections.erase(it);
+        }
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+        break;
+    }
+    break;
+    case LOK_CALLBACK_CELL_CURSOR:
+    {
+        if (pCallback->m_aPayload != "EMPTY")
+            priv->m_aCellCursor = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
+        else
+            memset(&priv->m_aCellCursor, 0, sizeof(priv->m_aCellCursor));
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+    }
+    break;
+    case LOK_CALLBACK_HYPERLINK_CLICKED:
+    {
+        hyperlinkClicked(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_STATE_CHANGED:
+    {
+        commandChanged(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_SEARCH_NOT_FOUND:
+    {
+        searchNotFound(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_DOCUMENT_SIZE_CHANGED:
+    {
+        refreshSize(pDocView);
+        g_signal_emit(pDocView, doc_view_signals[SIZE_CHANGED], 0, nullptr);
+    }
+    break;
+    case LOK_CALLBACK_SET_PART:
+    {
+        setPart(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_SEARCH_RESULT_SELECTION:
+    {
+        boost::property_tree::ptree aTree;
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::read_json(aStream, aTree);
+        int nCount = aTree.get_child("searchResultSelection").size();
+        searchResultCount(pDocView, std::to_string(nCount));
+    }
+    break;
+    case LOK_CALLBACK_UNO_COMMAND_RESULT:
+    {
+        commandResult(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_CELL_ADDRESS:
+    {
+        addressChanged(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_CELL_FORMULA:
+    {
+        formulaChanged(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_ERROR:
+    {
+        reportError(pDocView, pCallback->m_aPayload);
+    }
+    break;
+    case LOK_CALLBACK_INVALIDATE_VIEW_CURSOR:
+    {
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        int nViewId = aTree.get<int>("viewId");
+        int nPart = aTree.get<int>("part");
+        const std::string& rRectangle = aTree.get<std::string>("rectangle");
+        priv->m_aViewCursors[nViewId] = ViewRectangle(nPart, payloadToRectangle(pDocView, rRectangle.c_str()));
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+        break;
+    }
+    case LOK_CALLBACK_TEXT_VIEW_SELECTION:
+    {
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        int nViewId = aTree.get<int>("viewId");
+        int nPart = aTree.get<int>("part");
+        const std::string& rSelection = aTree.get<std::string>("selection");
+        priv->m_aTextViewSelectionRectangles[nViewId] = ViewRectangles(nPart, payloadToRectangles(pDocView, rSelection.c_str()));
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+        break;
+    }
+    case LOK_CALLBACK_VIEW_CURSOR_VISIBLE:
+    {
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        int nViewId = aTree.get<int>("viewId");
+        const std::string& rVisible = aTree.get<std::string>("visible");
+        priv->m_aViewCursorVisibilities[nViewId] = rVisible == "true";
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+        break;
+    }
+    break;
+    case LOK_CALLBACK_CELL_VIEW_CURSOR:
+    {
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        int nViewId = aTree.get<int>("viewId");
+        int nPart = aTree.get<int>("part");
+        const std::string& rRectangle = aTree.get<std::string>("rectangle");
+        if (rRectangle != "EMPTY")
+            priv->m_aCellViewCursors[nViewId] = ViewRectangle(nPart, payloadToRectangle(pDocView, rRectangle.c_str()));
+        else
+        {
+            auto it = priv->m_aCellViewCursors.find(nViewId);
+            if (it != priv->m_aCellViewCursors.end())
+                priv->m_aCellViewCursors.erase(it);
+        }
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+        break;
+    }
+    case LOK_CALLBACK_VIEW_LOCK:
+    {
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        int nViewId = aTree.get<int>("viewId");
+        int nPart = aTree.get<int>("part");
+        const std::string& rRectangle = aTree.get<std::string>("rectangle");
+        if (rRectangle != "EMPTY")
+            priv->m_aViewLockRectangles[nViewId] = ViewRectangle(nPart, payloadToRectangle(pDocView, rRectangle.c_str()));
+        else
+        {
+            auto it = priv->m_aViewLockRectangles.find(nViewId);
+            if (it != priv->m_aViewLockRectangles.end())
+                priv->m_aViewLockRectangles.erase(it);
+        }
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+        break;
+    }
+    case LOK_CALLBACK_REDLINE_TABLE_SIZE_CHANGED:
+    {
+        break;
+    }
+    case LOK_CALLBACK_REDLINE_TABLE_ENTRY_MODIFIED:
+    {
+        break;
+    }
+    case LOK_CALLBACK_COMMENT:
+        g_signal_emit(pCallback->m_pDocView, doc_view_signals[COMMENT], 0, pCallback->m_aPayload.c_str());
+        break;
+    case LOK_CALLBACK_RULER_UPDATE:
+        g_signal_emit(pCallback->m_pDocView, doc_view_signals[RULER], 0, pCallback->m_aPayload.c_str());
+        break;
+    case LOK_CALLBACK_WINDOW:
+        g_signal_emit(pCallback->m_pDocView, doc_view_signals[WINDOW], 0, pCallback->m_aPayload.c_str());
+        break;
+    case LOK_CALLBACK_INVALIDATE_HEADER:
+        g_signal_emit(pCallback->m_pDocView, doc_view_signals[INVALIDATE_HEADER], 0, pCallback->m_aPayload.c_str());
+        break;
+    case LOK_CALLBACK_REFERENCE_MARKS:
+    {
+        std::stringstream aStream(pCallback->m_aPayload);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+
+        priv->m_aReferenceMarks.clear();
+
+        for(const auto& rMark : aTree.get_child("marks"))
+        {
+            sal_uInt32 nColor = std::stoi(rMark.second.get<std::string>("color"), nullptr, 16);
+            std::string sRect = rMark.second.get<std::string>("rectangle");
+            sal_uInt32 nPart = std::stoi(rMark.second.get<std::string>("part"));
+
+            GdkRectangle aRect = payloadToRectangle(pDocView, sRect.c_str());
+            priv->m_aReferenceMarks.push_back(std::pair<ViewRectangle, sal_uInt32>(ViewRectangle(nPart, aRect), nColor));
+        }
+
+        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+        break;
+    }
+
+    case LOK_CALLBACK_STATUS_INDICATOR_START:
+    case LOK_CALLBACK_STATUS_INDICATOR_SET_VALUE:
+    case LOK_CALLBACK_STATUS_INDICATOR_FINISH:
+    case LOK_CALLBACK_DOCUMENT_PASSWORD:
+    case LOK_CALLBACK_DOCUMENT_PASSWORD_TO_MODIFY:
+    case LOK_CALLBACK_VALIDITY_LIST_BUTTON:
+    case LOK_CALLBACK_SIGNATURE_STATUS:
+    case LOK_CALLBACK_CONTEXT_MENU:
+    case LOK_CALLBACK_PROFILE_FRAME:
+    case LOK_CALLBACK_CLIPBOARD_CHANGED:
+    case LOK_CALLBACK_CONTEXT_CHANGED:
+    case LOK_CALLBACK_CELL_SELECTION_AREA:
+    case LOK_CALLBACK_CELL_AUTO_FILL_AREA:
+    case LOK_CALLBACK_TABLE_SELECTED:
+    case LOK_CALLBACK_JSDIALOG:
+    case LOK_CALLBACK_CALC_FUNCTION_LIST:
+    case LOK_CALLBACK_TAB_STOP_LIST:
+    case LOK_CALLBACK_FORM_FIELD_BUTTON:
+    {
+        // TODO: Implement me
+        break;
+    }
+    }
+    delete pCallback;
+
+    return G_SOURCE_REMOVE;
+}
+
+static void callbackWorker (int nType, const char* pPayload, void* pData)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (pData);
+
+    CallbackData* pCallback = new CallbackData(nType, pPayload ? pPayload : "(nil)", pDocView);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    std::stringstream ss;
+    ss << "callbackWorker, view #" << priv->m_nViewId << ": " << lokCallbackTypeToString(nType) << ", '" << (pPayload ? pPayload : "(nil)") << "'";
+    g_info("%s", ss.str().c_str());
+    gdk_threads_add_idle(callback, pCallback);
+}
+
+static void
+renderHandle(LOKDocView* pDocView,
+             cairo_t* pCairo,
+             const GdkRectangle& rCursor,
+             cairo_surface_t* pHandle,
+             GdkRectangle& rRectangle)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    GdkPoint aCursorBottom;
+    int nHandleWidth, nHandleHeight;
+    double fHandleScale;
+
+    nHandleWidth = cairo_image_surface_get_width(pHandle);
+    nHandleHeight = cairo_image_surface_get_height(pHandle);
+    // We want to scale down the handle, so that its height is the same as the cursor caret.
+    fHandleScale = twipToPixel(rCursor.height, priv->m_fZoom) / nHandleHeight;
+    // We want the top center of the handle bitmap to be at the bottom center of the cursor rectangle.
+    aCursorBottom.x = twipToPixel(rCursor.x, priv->m_fZoom) + twipToPixel(rCursor.width, priv->m_fZoom) / 2 - (nHandleWidth * fHandleScale) / 2;
+    aCursorBottom.y = twipToPixel(rCursor.y, priv->m_fZoom) + twipToPixel(rCursor.height, priv->m_fZoom);
+
+    cairo_save (pCairo);
+    cairo_scale(pCairo, 1.0 / nScaleFactor, 1.0 / nScaleFactor);
+    cairo_translate(pCairo, aCursorBottom.x * nScaleFactor, aCursorBottom.y * nScaleFactor);
+    cairo_scale(pCairo, fHandleScale * nScaleFactor, fHandleScale * nScaleFactor);
+    cairo_set_source_surface(pCairo, pHandle, 0, 0);
+    cairo_paint(pCairo);
+    cairo_restore (pCairo);
+
+    rRectangle.x = aCursorBottom.x;
+    rRectangle.y = aCursorBottom.y;
+    rRectangle.width = nHandleWidth * fHandleScale;
+    rRectangle.height = nHandleHeight * fHandleScale;
+}
+
+/// Renders handles around an rSelection rectangle on pCairo.
+static void
+renderGraphicHandle(LOKDocView* pDocView,
+                    cairo_t* pCairo,
+                    const GdkRectangle& rSelection,
+                    const GdkRGBA& rColor)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    int nHandleWidth = 9, nHandleHeight = 9;
+    GdkRectangle aSelection;
+
+    aSelection.x = twipToPixel(rSelection.x, priv->m_fZoom);
+    aSelection.y = twipToPixel(rSelection.y, priv->m_fZoom);
+    aSelection.width = twipToPixel(rSelection.width, priv->m_fZoom);
+    aSelection.height = twipToPixel(rSelection.height, priv->m_fZoom);
+
+    for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
+    {
+        int x = aSelection.x, y = aSelection.y;
+
+        switch (i)
+        {
+        case 0: // top-left
+            break;
+        case 1: // top-middle
+            x += aSelection.width / 2;
+            break;
+        case 2: // top-right
+            x += aSelection.width;
+            break;
+        case 3: // middle-left
+            y += aSelection.height / 2;
+            break;
+        case 4: // middle-right
+            x += aSelection.width;
+            y += aSelection.height / 2;
+            break;
+        case 5: // bottom-left
+            y += aSelection.height;
+            break;
+        case 6: // bottom-middle
+            x += aSelection.width / 2;
+            y += aSelection.height;
+            break;
+        case 7: // bottom-right
+            x += aSelection.width;
+            y += aSelection.height;
+            break;
+        }
+
+        // Center the handle.
+        x -= nHandleWidth / 2;
+        y -= nHandleHeight / 2;
+
+        priv->m_aGraphicHandleRects[i].x = x;
+        priv->m_aGraphicHandleRects[i].y = y;
+        priv->m_aGraphicHandleRects[i].width = nHandleWidth;
+        priv->m_aGraphicHandleRects[i].height = nHandleHeight;
+
+        cairo_set_source_rgb(pCairo, rColor.red, rColor.green, rColor.blue);
+        cairo_rectangle(pCairo, x, y, nHandleWidth, nHandleHeight);
+        cairo_fill(pCairo);
+    }
+}
+
+/// Finishes the paint tile operation and returns the result, if any
+static gpointer
+paintTileFinish(LOKDocView* pDocView, GAsyncResult* res, GError **error)
+{
+    GTask* task = G_TASK(res);
+
+    g_return_val_if_fail(LOK_IS_DOC_VIEW(pDocView), nullptr);
+    g_return_val_if_fail(g_task_is_valid(res, pDocView), nullptr);
+    g_return_val_if_fail(error == nullptr || *error == nullptr, nullptr);
+
+    return g_task_propagate_pointer(task, error);
+}
+
+/// Callback called in the main UI thread when paintTileInThread in LOK thread has finished
+static void
+paintTileCallback(GObject* sourceObject, GAsyncResult* res, gpointer userData)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW(sourceObject);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(userData);
+    std::unique_ptr<TileBuffer>& buffer = priv->m_pTileBuffer;
+    GError* error;
+
+    error = nullptr;
+    cairo_surface_t* pSurface = static_cast<cairo_surface_t*>(paintTileFinish(pDocView, res, &error));
+    if (error != nullptr)
+    {
+        if (error->domain == LOK_TILEBUFFER_ERROR &&
+            error->code == LOK_TILEBUFFER_CHANGED)
+            g_info("Skipping paint tile request because corresponding"
+                   "tile buffer has been destroyed");
+        else
+            g_warning("Unable to get painted GdkPixbuf: %s", error->message);
+        g_error_free(error);
+        return;
+    }
+
+    buffer->setTile(pLOEvent->m_nPaintTileX, pLOEvent->m_nPaintTileY, pSurface);
+    gdk_threads_add_idle(queueDraw, GTK_WIDGET(pDocView));
+
+    cairo_surface_destroy(pSurface);
+}
+
+
+static bool
+renderDocument(LOKDocView* pDocView, cairo_t* pCairo)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GdkRectangle aVisibleArea;
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    gint nTileSizePixelsScaled = nTileSizePixels * nScaleFactor;
+    long nDocumentWidthPixels = twipToPixel(priv->m_nDocumentWidthTwips, priv->m_fZoom) * nScaleFactor;
+    long nDocumentHeightPixels = twipToPixel(priv->m_nDocumentHeightTwips, priv->m_fZoom) * nScaleFactor;
+    // Total number of rows / columns in this document.
+    guint nRows = ceil(static_cast<double>(nDocumentHeightPixels) / nTileSizePixelsScaled);
+    guint nColumns = ceil(static_cast<double>(nDocumentWidthPixels) / nTileSizePixelsScaled);
+
+    cairo_save (pCairo);
+    cairo_scale (pCairo, 1.0/nScaleFactor, 1.0/nScaleFactor);
+    gdk_cairo_get_clip_rectangle (pCairo, &aVisibleArea);
+    aVisibleArea.x = pixelToTwip (aVisibleArea.x, priv->m_fZoom);
+    aVisibleArea.y = pixelToTwip (aVisibleArea.y, priv->m_fZoom);
+    aVisibleArea.width = pixelToTwip (aVisibleArea.width, priv->m_fZoom);
+    aVisibleArea.height = pixelToTwip (aVisibleArea.height, priv->m_fZoom);
+
+    // Render the tiles.
+    for (guint nRow = 0; nRow < nRows; ++nRow)
+    {
+        for (guint nColumn = 0; nColumn < nColumns; ++nColumn)
+        {
+            GdkRectangle aTileRectangleTwips, aTileRectanglePixels;
+            bool bPaint = true;
+
+            // Determine size of the tile: the rightmost/bottommost tiles may
+            // be smaller, and we need the size to decide if we need to repaint.
+            if (nColumn == nColumns - 1)
+                aTileRectanglePixels.width = nDocumentWidthPixels - nColumn * nTileSizePixelsScaled;
+            else
+                aTileRectanglePixels.width = nTileSizePixelsScaled;
+            if (nRow == nRows - 1)
+                aTileRectanglePixels.height = nDocumentHeightPixels - nRow * nTileSizePixelsScaled;
+            else
+                aTileRectanglePixels.height = nTileSizePixelsScaled;
+
+            // Determine size and position of the tile in document coordinates,
+            // so we can decide if we can skip painting for partial rendering.
+            aTileRectangleTwips.x = pixelToTwip(nTileSizePixelsScaled, priv->m_fZoom) * nColumn;
+            aTileRectangleTwips.y = pixelToTwip(nTileSizePixelsScaled, priv->m_fZoom) * nRow;
+            aTileRectangleTwips.width = pixelToTwip(aTileRectanglePixels.width, priv->m_fZoom);
+            aTileRectangleTwips.height = pixelToTwip(aTileRectanglePixels.height, priv->m_fZoom);
+
+            if (!gdk_rectangle_intersect(&aVisibleArea, &aTileRectangleTwips, nullptr))
+                bPaint = false;
+
+            if (bPaint)
+            {
+                LOEvent* pLOEvent = new LOEvent(LOK_PAINT_TILE);
+                pLOEvent->m_nPaintTileX = nRow;
+                pLOEvent->m_nPaintTileY = nColumn;
+                pLOEvent->m_fPaintTileZoom = priv->m_fZoom;
+                pLOEvent->m_pTileBuffer = &*priv->m_pTileBuffer;
+                GTask* task = g_task_new(pDocView, nullptr, paintTileCallback, pLOEvent);
+                g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+                Tile& currentTile = priv->m_pTileBuffer->getTile(nRow, nColumn, task, priv->lokThreadPool);
+                cairo_surface_t* pSurface = currentTile.getBuffer();
+                cairo_set_source_surface(pCairo, pSurface,
+                                             twipToPixel(aTileRectangleTwips.x, priv->m_fZoom),
+                                             twipToPixel(aTileRectangleTwips.y, priv->m_fZoom));
+                cairo_paint(pCairo);
+                g_object_unref(task);
+            }
+        }
+    }
+
+    cairo_restore (pCairo);
+    return false;
+}
+
+static const GdkRGBA& getDarkColor(int nViewId, LOKDocViewPrivate& priv)
+{
+    static std::map<int, GdkRGBA> aColorMap;
+    auto it = aColorMap.find(nViewId);
+    if (it != aColorMap.end())
+        return it->second;
+
+    if (priv->m_eDocumentType == LOK_DOCTYPE_TEXT)
+    {
+        char* pValues = priv->m_pDocument->pClass->getCommandValues(priv->m_pDocument, ".uno:TrackedChangeAuthors");
+        std::stringstream aInfo;
+        aInfo << "lok::Document::getCommandValues('.uno:TrackedChangeAuthors') returned '" << pValues << "'" << std::endl;
+        g_info("%s", aInfo.str().c_str());
+
+        std::stringstream aStream(pValues);
+        boost::property_tree::ptree aTree;
+        boost::property_tree::read_json(aStream, aTree);
+        for (const auto& rValue : aTree.get_child("authors"))
+        {
+            const std::string& rName = rValue.second.get<std::string>("name");
+            guint32 nColor = rValue.second.get<guint32>("color");
+            GdkRGBA aColor{static_cast<double>(static_cast<guint8>(nColor>>16))/255, static_cast<double>(static_cast<guint8>(static_cast<guint16>(nColor) >> 8))/255, static_cast<double>(static_cast<guint8>(nColor))/255, 0};
+            auto itAuthorViews = g_aAuthorViews.find(rName);
+            if (itAuthorViews != g_aAuthorViews.end())
+                aColorMap[itAuthorViews->second] = aColor;
+        }
+    }
+    else
+    {
+        // Based on tools/color.hxx, COL_AUTHOR1_DARK..COL_AUTHOR9_DARK.
+        static std::vector<GdkRGBA> aColors =
+        {
+            {(double(198))/255, (double(146))/255, (double(0))/255, 0},
+            {(double(6))/255, (double(70))/255, (double(162))/255, 0},
+            {(double(87))/255, (double(157))/255, (double(28))/255, 0},
+            {(double(105))/255, (double(43))/255, (double(157))/255, 0},
+            {(double(197))/255, (double(0))/255, (double(11))/255, 0},
+            {(double(0))/255, (double(128))/255, (double(128))/255, 0},
+            {(double(140))/255, (double(132))/255, (double(0))/255, 0},
+            {(double(43))/255, (double(85))/255, (double(107))/255, 0},
+            {(double(209))/255, (double(118))/255, (double(0))/255, 0},
+        };
+        static int nColorCounter = 0;
+        GdkRGBA aColor = aColors[nColorCounter++ % aColors.size()];
+        aColorMap[nViewId] = aColor;
+    }
+    assert(aColorMap.find(nViewId) != aColorMap.end());
+    return aColorMap[nViewId];
+}
+
+static bool
+renderOverlay(LOKDocView* pDocView, cairo_t* pCairo)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    if (priv->m_bEdit && priv->m_bCursorVisible && priv->m_bCursorOverlayVisible && !isEmptyRectangle(priv->m_aVisibleCursor))
+    {
+        if (priv->m_aVisibleCursor.width < 30)
+            // Set a minimal width if it would be 0.
+            priv->m_aVisibleCursor.width = 30;
+
+        cairo_set_source_rgb(pCairo, 0, 0, 0);
+        cairo_rectangle(pCairo,
+                        twipToPixel(priv->m_aVisibleCursor.x, priv->m_fZoom),
+                        twipToPixel(priv->m_aVisibleCursor.y, priv->m_fZoom),
+                        twipToPixel(priv->m_aVisibleCursor.width, priv->m_fZoom),
+                        twipToPixel(priv->m_aVisibleCursor.height, priv->m_fZoom));
+        cairo_fill(pCairo);
+    }
+
+    // View cursors: they do not blink and are colored.
+    if (priv->m_bEdit && !priv->m_aViewCursors.empty())
+    {
+        for (auto& rPair : priv->m_aViewCursors)
+        {
+            auto itVisibility = priv->m_aViewCursorVisibilities.find(rPair.first);
+            if (itVisibility != priv->m_aViewCursorVisibilities.end() && !itVisibility->second)
+                continue;
+
+            // Show view cursors when in Writer or when the part matches.
+            if (rPair.second.m_nPart != priv->m_nPartId && priv->m_eDocumentType != LOK_DOCTYPE_TEXT)
+                continue;
+
+            GdkRectangle& rCursor = rPair.second.m_aRectangle;
+            if (rCursor.width < 30)
+                // Set a minimal width if it would be 0.
+                rCursor.width = 30;
+
+            const GdkRGBA& rDark = getDarkColor(rPair.first, priv);
+            cairo_set_source_rgb(pCairo, rDark.red, rDark.green, rDark.blue);
+            cairo_rectangle(pCairo,
+                            twipToPixel(rCursor.x, priv->m_fZoom),
+                            twipToPixel(rCursor.y, priv->m_fZoom),
+                            twipToPixel(rCursor.width, priv->m_fZoom),
+                            twipToPixel(rCursor.height, priv->m_fZoom));
+            cairo_fill(pCairo);
+        }
+    }
+
+    if (priv->m_bEdit && priv->m_bCursorVisible && !isEmptyRectangle(priv->m_aVisibleCursor) && priv->m_aTextSelectionRectangles.empty())
+    {
+        // Have a cursor, but no selection: we need the middle handle.
+        gchar* handleMiddlePath = g_strconcat (priv->m_aLOPath.c_str(), CURSOR_HANDLE_DIR, "handle_image_middle.png", nullptr);
+        if (!priv->m_pHandleMiddle)
+        {
+            priv->m_pHandleMiddle = cairo_image_surface_create_from_png(handleMiddlePath);
+            assert(cairo_surface_status(priv->m_pHandleMiddle) == CAIRO_STATUS_SUCCESS);
+        }
+        g_free (handleMiddlePath);
+        renderHandle(pDocView, pCairo, priv->m_aVisibleCursor, priv->m_pHandleMiddle, priv->m_aHandleMiddleRect);
+    }
+
+    if (!priv->m_aTextSelectionRectangles.empty())
+    {
+        for (const GdkRectangle& rRectangle : priv->m_aTextSelectionRectangles)
+        {
+            // Blue with 75% transparency.
+            cairo_set_source_rgba(pCairo, (double(0x43))/255, (double(0xac))/255, (double(0xe8))/255, 0.25);
+            cairo_rectangle(pCairo,
+                            twipToPixel(rRectangle.x, priv->m_fZoom),
+                            twipToPixel(rRectangle.y, priv->m_fZoom),
+                            twipToPixel(rRectangle.width, priv->m_fZoom),
+                            twipToPixel(rRectangle.height, priv->m_fZoom));
+            cairo_fill(pCairo);
+        }
+
+        // Handles
+        if (!isEmptyRectangle(priv->m_aTextSelectionStart))
+        {
+            // Have a start position: we need a start handle.
+            gchar* handleStartPath = g_strconcat (priv->m_aLOPath.c_str(), CURSOR_HANDLE_DIR, "handle_image_start.png", nullptr);
+            if (!priv->m_pHandleStart)
+            {
+                priv->m_pHandleStart = cairo_image_surface_create_from_png(handleStartPath);
+                assert(cairo_surface_status(priv->m_pHandleStart) == CAIRO_STATUS_SUCCESS);
+            }
+            renderHandle(pDocView, pCairo, priv->m_aTextSelectionStart, priv->m_pHandleStart, priv->m_aHandleStartRect);
+            g_free (handleStartPath);
+        }
+        if (!isEmptyRectangle(priv->m_aTextSelectionEnd))
+        {
+            // Have a start position: we need an end handle.
+            gchar* handleEndPath = g_strconcat (priv->m_aLOPath.c_str(), CURSOR_HANDLE_DIR, "handle_image_end.png", nullptr);
+            if (!priv->m_pHandleEnd)
+            {
+                priv->m_pHandleEnd = cairo_image_surface_create_from_png(handleEndPath);
+                assert(cairo_surface_status(priv->m_pHandleEnd) == CAIRO_STATUS_SUCCESS);
+            }
+            renderHandle(pDocView, pCairo, priv->m_aTextSelectionEnd, priv->m_pHandleEnd, priv->m_aHandleEndRect);
+            g_free (handleEndPath);
+        }
+    }
+
+    // Selections of other views.
+    for (const auto& rPair : priv->m_aTextViewSelectionRectangles)
+    {
+        if (rPair.second.m_nPart != priv->m_nPartId && priv->m_eDocumentType != LOK_DOCTYPE_TEXT)
+            continue;
+
+        for (const GdkRectangle& rRectangle : rPair.second.m_aRectangles)
+        {
+            const GdkRGBA& rDark = getDarkColor(rPair.first, priv);
+            // 75% transparency.
+            cairo_set_source_rgba(pCairo, rDark.red, rDark.green, rDark.blue, 0.25);
+            cairo_rectangle(pCairo,
+                            twipToPixel(rRectangle.x, priv->m_fZoom),
+                            twipToPixel(rRectangle.y, priv->m_fZoom),
+                            twipToPixel(rRectangle.width, priv->m_fZoom),
+                            twipToPixel(rRectangle.height, priv->m_fZoom));
+            cairo_fill(pCairo);
+        }
+    }
+
+    if (!isEmptyRectangle(priv->m_aGraphicSelection))
+    {
+        GdkRGBA const aBlack{0, 0, 0, 0};
+        renderGraphicHandle(pDocView, pCairo, priv->m_aGraphicSelection, aBlack);
+    }
+
+    // Graphic selections of other views.
+    for (const auto& rPair : priv->m_aGraphicViewSelections)
+    {
+        const ViewRectangle& rRectangle = rPair.second;
+        if (rRectangle.m_nPart != priv->m_nPartId && priv->m_eDocumentType != LOK_DOCTYPE_TEXT)
+            continue;
+
+        const GdkRGBA& rDark = getDarkColor(rPair.first, priv);
+        renderGraphicHandle(pDocView, pCairo, rRectangle.m_aRectangle, rDark);
+    }
+
+    // Draw the cell cursor.
+    if (!isEmptyRectangle(priv->m_aCellCursor))
+    {
+        cairo_set_source_rgb(pCairo, 0, 0, 0);
+        cairo_rectangle(pCairo,
+                        twipToPixel(priv->m_aCellCursor.x, priv->m_fZoom),
+                        twipToPixel(priv->m_aCellCursor.y, priv->m_fZoom),
+                        twipToPixel(priv->m_aCellCursor.width, priv->m_fZoom),
+                        twipToPixel(priv->m_aCellCursor.height, priv->m_fZoom));
+        cairo_set_line_width(pCairo, 2.0);
+        cairo_stroke(pCairo);
+    }
+
+    // Cell view cursors: they are colored.
+    for (const auto& rPair : priv->m_aCellViewCursors)
+    {
+        const ViewRectangle& rCursor = rPair.second;
+        if (rCursor.m_nPart != priv->m_nPartId)
+            continue;
+
+        const GdkRGBA& rDark = getDarkColor(rPair.first, priv);
+        cairo_set_source_rgb(pCairo, rDark.red, rDark.green, rDark.blue);
+        cairo_rectangle(pCairo,
+                        twipToPixel(rCursor.m_aRectangle.x, priv->m_fZoom),
+                        twipToPixel(rCursor.m_aRectangle.y, priv->m_fZoom),
+                        twipToPixel(rCursor.m_aRectangle.width, priv->m_fZoom),
+                        twipToPixel(rCursor.m_aRectangle.height, priv->m_fZoom));
+        cairo_set_line_width(pCairo, 2.0);
+        cairo_stroke(pCairo);
+    }
+
+    // Draw reference marks.
+    for (const auto& rPair : priv->m_aReferenceMarks)
+    {
+        const ViewRectangle& rMark = rPair.first;
+        if (rMark.m_nPart != priv->m_nPartId)
+            continue;
+
+        sal_uInt32 nColor = rPair.second;
+        sal_uInt8 nRed = (nColor >> 16) & 0xff;
+        sal_uInt8 nGreen = (nColor >> 8) & 0xff;
+        sal_uInt8 nBlue = nColor & 0xff;
+        cairo_set_source_rgb(pCairo, nRed, nGreen, nBlue);
+        cairo_rectangle(pCairo,
+                        twipToPixel(rMark.m_aRectangle.x, priv->m_fZoom),
+                        twipToPixel(rMark.m_aRectangle.y, priv->m_fZoom),
+                        twipToPixel(rMark.m_aRectangle.width, priv->m_fZoom),
+                        twipToPixel(rMark.m_aRectangle.height, priv->m_fZoom));
+        cairo_set_line_width(pCairo, 2.0);
+        cairo_stroke(pCairo);
+    }
+
+    // View locks: they are colored.
+    for (const auto& rPair : priv->m_aViewLockRectangles)
+    {
+        const ViewRectangle& rRectangle = rPair.second;
+        if (rRectangle.m_nPart != priv->m_nPartId)
+            continue;
+
+        // Draw a rectangle.
+        const GdkRGBA& rDark = getDarkColor(rPair.first, priv);
+        cairo_set_source_rgb(pCairo, rDark.red, rDark.green, rDark.blue);
+        cairo_rectangle(pCairo,
+                        twipToPixel(rRectangle.m_aRectangle.x, priv->m_fZoom),
+                        twipToPixel(rRectangle.m_aRectangle.y, priv->m_fZoom),
+                        twipToPixel(rRectangle.m_aRectangle.width, priv->m_fZoom),
+                        twipToPixel(rRectangle.m_aRectangle.height, priv->m_fZoom));
+        cairo_set_line_width(pCairo, 2.0);
+        cairo_stroke(pCairo);
+
+        // And a lock.
+        cairo_rectangle(pCairo,
+                        twipToPixel(rRectangle.m_aRectangle.x + rRectangle.m_aRectangle.width, priv->m_fZoom) - 25,
+                        twipToPixel(rRectangle.m_aRectangle.y + rRectangle.m_aRectangle.height, priv->m_fZoom) - 15,
+                        20,
+                        10);
+        cairo_fill(pCairo);
+        cairo_arc(pCairo,
+                  twipToPixel(rRectangle.m_aRectangle.x + rRectangle.m_aRectangle.width, priv->m_fZoom) - 15,
+                  twipToPixel(rRectangle.m_aRectangle.y + rRectangle.m_aRectangle.height, priv->m_fZoom) - 15,
+                  5,
+                  180.0 * (M_PI/180.0),
+                  360.0 * (M_PI/180.0));
+        cairo_stroke(pCairo);
+    }
+
+    return false;
+}
+
+static gboolean
+lok_doc_view_signal_button(GtkWidget* pWidget, GdkEventButton* pEvent)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (pWidget);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GError* error = nullptr;
+
+    g_info("LOKDocView_Impl::signalButton: %d, %d (in twips: %d, %d)",
+           static_cast<int>(pEvent->x), static_cast<int>(pEvent->y),
+           static_cast<int>(pixelToTwip(pEvent->x, priv->m_fZoom)),
+           static_cast<int>(pixelToTwip(pEvent->y, priv->m_fZoom)));
+    gtk_widget_grab_focus(GTK_WIDGET(pDocView));
+
+    switch (pEvent->type)
+    {
+    case GDK_BUTTON_PRESS:
+    {
+        GdkRectangle aClick;
+        aClick.x = pEvent->x;
+        aClick.y = pEvent->y;
+        aClick.width = 1;
+        aClick.height = 1;
+
+        if (handleTextSelectionOnButtonPress(aClick, pDocView))
+            return FALSE;
+        if (handleGraphicSelectionOnButtonPress(aClick, pDocView))
+            return FALSE;
+
+        int nCount = 1;
+        if ((pEvent->time - priv->m_nLastButtonPressTime) < 250)
+            nCount++;
+        priv->m_nLastButtonPressTime = pEvent->time;
+        GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+        LOEvent* pLOEvent = new LOEvent(LOK_POST_MOUSE_EVENT);
+        pLOEvent->m_nPostMouseEventType = LOK_MOUSEEVENT_MOUSEBUTTONDOWN;
+        pLOEvent->m_nPostMouseEventX = pixelToTwip(pEvent->x, priv->m_fZoom);
+        pLOEvent->m_nPostMouseEventY = pixelToTwip(pEvent->y, priv->m_fZoom);
+        pLOEvent->m_nPostMouseEventCount = nCount;
+        switch (pEvent->button)
+        {
+        case 1:
+            pLOEvent->m_nPostMouseEventButton = MOUSE_LEFT;
+            break;
+        case 2:
+            pLOEvent->m_nPostMouseEventButton = MOUSE_MIDDLE;
+            break;
+        case 3:
+            pLOEvent->m_nPostMouseEventButton = MOUSE_RIGHT;
+            break;
+        }
+        pLOEvent->m_nPostMouseEventModifier = priv->m_nKeyModifier;
+        priv->m_nLastButtonPressed = pLOEvent->m_nPostMouseEventButton;
+        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+        if (error != nullptr)
+        {
+            g_warning("Unable to call LOK_POST_MOUSE_EVENT: %s", error->message);
+            g_clear_error(&error);
+        }
+        g_object_unref(task);
+        break;
+    }
+    case GDK_BUTTON_RELEASE:
+    {
+        if (handleTextSelectionOnButtonRelease(pDocView))
+            return FALSE;
+        if (handleGraphicSelectionOnButtonRelease(pDocView, pEvent))
+            return FALSE;
+
+        int nCount = 1;
+        if ((pEvent->time - priv->m_nLastButtonReleaseTime) < 250)
+            nCount++;
+        priv->m_nLastButtonReleaseTime = pEvent->time;
+        GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+        LOEvent* pLOEvent = new LOEvent(LOK_POST_MOUSE_EVENT);
+        pLOEvent->m_nPostMouseEventType = LOK_MOUSEEVENT_MOUSEBUTTONUP;
+        pLOEvent->m_nPostMouseEventX = pixelToTwip(pEvent->x, priv->m_fZoom);
+        pLOEvent->m_nPostMouseEventY = pixelToTwip(pEvent->y, priv->m_fZoom);
+        pLOEvent->m_nPostMouseEventCount = nCount;
+        switch (pEvent->button)
+        {
+        case 1:
+            pLOEvent->m_nPostMouseEventButton = MOUSE_LEFT;
+            break;
+        case 2:
+            pLOEvent->m_nPostMouseEventButton = MOUSE_MIDDLE;
+            break;
+        case 3:
+            pLOEvent->m_nPostMouseEventButton = MOUSE_RIGHT;
+            break;
+        }
+        pLOEvent->m_nPostMouseEventModifier = priv->m_nKeyModifier;
+        priv->m_nLastButtonPressed = pLOEvent->m_nPostMouseEventButton;
+        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+        if (error != nullptr)
+        {
+            g_warning("Unable to call LOK_POST_MOUSE_EVENT: %s", error->message);
+            g_clear_error(&error);
+        }
+        g_object_unref(task);
+        break;
+    }
+    default:
+        break;
+    }
+    return FALSE;
+}
+
+static void
+getDragPoint(GdkRectangle* pHandle,
+             GdkEventMotion* pEvent,
+             GdkPoint* pPoint)
+{
+    GdkPoint aCursor, aHandle;
+
+    // Center of the cursor rectangle: we know that it's above the handle.
+    aCursor.x = pHandle->x + pHandle->width / 2;
+    aCursor.y = pHandle->y - pHandle->height / 2;
+    // Center of the handle rectangle.
+    aHandle.x = pHandle->x + pHandle->width / 2;
+    aHandle.y = pHandle->y + pHandle->height / 2;
+    // Our target is the original cursor position + the dragged offset.
+    pPoint->x = aCursor.x + (pEvent->x - aHandle.x);
+    pPoint->y = aCursor.y + (pEvent->y - aHandle.y);
+}
+
+static gboolean
+lok_doc_view_signal_motion (GtkWidget* pWidget, GdkEventMotion* pEvent)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (pWidget);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GdkPoint aPoint;
+    GError* error = nullptr;
+
+    std::unique_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    if (priv->m_bInDragMiddleHandle)
+    {
+        g_info("lcl_signalMotion: dragging the middle handle");
+        getDragPoint(&priv->m_aHandleMiddleRect, pEvent, &aPoint);
+        priv->m_pDocument->pClass->setTextSelection(priv->m_pDocument, LOK_SETTEXTSELECTION_RESET, pixelToTwip(aPoint.x, priv->m_fZoom), pixelToTwip(aPoint.y, priv->m_fZoom));
+        return FALSE;
+    }
+    if (priv->m_bInDragStartHandle)
+    {
+        g_info("lcl_signalMotion: dragging the start handle");
+        getDragPoint(&priv->m_aHandleStartRect, pEvent, &aPoint);
+        priv->m_pDocument->pClass->setTextSelection(priv->m_pDocument, LOK_SETTEXTSELECTION_START, pixelToTwip(aPoint.x, priv->m_fZoom), pixelToTwip(aPoint.y, priv->m_fZoom));
+        return FALSE;
+    }
+    if (priv->m_bInDragEndHandle)
+    {
+        g_info("lcl_signalMotion: dragging the end handle");
+        getDragPoint(&priv->m_aHandleEndRect, pEvent, &aPoint);
+        priv->m_pDocument->pClass->setTextSelection(priv->m_pDocument, LOK_SETTEXTSELECTION_END, pixelToTwip(aPoint.x, priv->m_fZoom), pixelToTwip(aPoint.y, priv->m_fZoom));
+        return FALSE;
+    }
+    aGuard.unlock();
+    for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
+    {
+        if (priv->m_bInDragGraphicHandles[i])
+        {
+            g_info("lcl_signalMotion: dragging the graphic handle #%d", i);
+            return FALSE;
+        }
+    }
+    if (priv->m_bInDragGraphicSelection)
+    {
+        g_info("lcl_signalMotion: dragging the graphic selection");
+        return FALSE;
+    }
+
+    GdkRectangle aMotionInTwipsInTwips;
+    aMotionInTwipsInTwips.x = pixelToTwip(pEvent->x, priv->m_fZoom);
+    aMotionInTwipsInTwips.y = pixelToTwip(pEvent->y, priv->m_fZoom);
+    aMotionInTwipsInTwips.width = 1;
+    aMotionInTwipsInTwips.height = 1;
+    if (gdk_rectangle_intersect(&aMotionInTwipsInTwips, &priv->m_aGraphicSelection, nullptr))
+    {
+        g_info("lcl_signalMotion: start of drag graphic selection");
+        priv->m_bInDragGraphicSelection = true;
+
+        GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+        LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
+        pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_START;
+        pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(pEvent->x, priv->m_fZoom);
+        pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(pEvent->y, priv->m_fZoom);
+        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+        if (error != nullptr)
+        {
+            g_warning("Unable to call LOK_SET_GRAPHIC_SELECTION: %s", error->message);
+            g_clear_error(&error);
+        }
+        g_object_unref(task);
+
+        return FALSE;
+    }
+
+    // Otherwise a mouse move, as on the desktop.
+
+    GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+    LOEvent* pLOEvent = new LOEvent(LOK_POST_MOUSE_EVENT);
+    pLOEvent->m_nPostMouseEventType = LOK_MOUSEEVENT_MOUSEMOVE;
+    pLOEvent->m_nPostMouseEventX = pixelToTwip(pEvent->x, priv->m_fZoom);
+    pLOEvent->m_nPostMouseEventY = pixelToTwip(pEvent->y, priv->m_fZoom);
+    pLOEvent->m_nPostMouseEventCount = 1;
+    pLOEvent->m_nPostMouseEventButton = priv->m_nLastButtonPressed;
+    pLOEvent->m_nPostMouseEventModifier = priv->m_nKeyModifier;
+
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_MOUSEEVENT_MOUSEMOVE: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+
+    return FALSE;
+}
+
+static void
+setGraphicSelectionInThread(gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    ss.str(std::string());
+    ss << "lok::Document::setGraphicSelection(" << pLOEvent->m_nSetGraphicSelectionType;
+    ss << ", " << pLOEvent->m_nSetGraphicSelectionX;
+    ss << ", " << pLOEvent->m_nSetGraphicSelectionY << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setGraphicSelection(priv->m_pDocument,
+                                                   pLOEvent->m_nSetGraphicSelectionType,
+                                                   pLOEvent->m_nSetGraphicSelectionX,
+                                                   pLOEvent->m_nSetGraphicSelectionY);
+}
+
+static void
+setClientZoomInThread(gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    priv->m_pDocument->pClass->setClientZoom(priv->m_pDocument,
+                                             pLOEvent->m_nTilePixelWidth,
+                                             pLOEvent->m_nTilePixelHeight,
+                                             pLOEvent->m_nTileTwipWidth,
+                                             pLOEvent->m_nTileTwipHeight);
+}
+
+static void
+postMouseEventInThread(gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    ss.str(std::string());
+    ss << "lok::Document::postMouseEvent(" << pLOEvent->m_nPostMouseEventType;
+    ss << ", " << pLOEvent->m_nPostMouseEventX;
+    ss << ", " << pLOEvent->m_nPostMouseEventY;
+    ss << ", " << pLOEvent->m_nPostMouseEventCount;
+    ss << ", " << pLOEvent->m_nPostMouseEventButton;
+    ss << ", " << pLOEvent->m_nPostMouseEventModifier << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->postMouseEvent(priv->m_pDocument,
+                                              pLOEvent->m_nPostMouseEventType,
+                                              pLOEvent->m_nPostMouseEventX,
+                                              pLOEvent->m_nPostMouseEventY,
+                                              pLOEvent->m_nPostMouseEventCount,
+                                              pLOEvent->m_nPostMouseEventButton,
+                                              pLOEvent->m_nPostMouseEventModifier);
+}
+
+static void
+openDocumentInThread (gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    if ( priv->m_pDocument )
+    {
+        priv->m_pDocument->pClass->destroy( priv->m_pDocument );
+        priv->m_pDocument = nullptr;
+    }
+
+    priv->m_pOffice->pClass->registerCallback(priv->m_pOffice, globalCallbackWorker, pDocView);
+    priv->m_pDocument = priv->m_pOffice->pClass->documentLoadWithOptions( priv->m_pOffice, priv->m_aDocPath.c_str(), "en-US" );
+    if ( !priv->m_pDocument )
+    {
+        char *pError = priv->m_pOffice->pClass->getError( priv->m_pOffice );
+        g_task_return_new_error(task, g_quark_from_static_string ("LOK error"), 0, "%s", pError);
+    }
+    else
+    {
+        priv->m_eDocumentType = static_cast<LibreOfficeKitDocumentType>(priv->m_pDocument->pClass->getDocumentType(priv->m_pDocument));
+        gdk_threads_add_idle(postDocumentLoad, pDocView);
+        g_task_return_boolean (task, true);
+    }
+}
+
+static void
+setPartInThread(gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+    int nPart = pLOEvent->m_nPart;
+
+    std::unique_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    priv->m_pDocument->pClass->setPart( priv->m_pDocument, nPart );
+    aGuard.unlock();
+
+    lok_doc_view_reset_view(pDocView);
+}
+
+static void
+setPartmodeInThread(gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+    int nPartMode = pLOEvent->m_nPartMode;
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    priv->m_pDocument->pClass->setPartMode( priv->m_pDocument, nPartMode );
+}
+
+static void
+setEditInThread(gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+    bool bWasEdit = priv->m_bEdit;
+    bool bEdit = pLOEvent->m_bEdit;
+
+    if (!priv->m_bEdit && bEdit)
+        g_info("lok_doc_view_set_edit: entering edit mode");
+    else if (priv->m_bEdit && !bEdit)
+    {
+        g_info("lok_doc_view_set_edit: leaving edit mode");
+        std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+        std::stringstream ss;
+        ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+        g_info("%s", ss.str().c_str());
+        priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+        priv->m_pDocument->pClass->resetSelection(priv->m_pDocument);
+    }
+    priv->m_bEdit = bEdit;
+    g_signal_emit(pDocView, doc_view_signals[EDIT_CHANGED], 0, bWasEdit);
+    gdk_threads_add_idle(queueDraw, GTK_WIDGET(pDocView));
+}
+
+static void
+postCommandInThread (gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    ss.str(std::string());
+    ss << "lok::Document::postUnoCommand(" << pLOEvent->m_pCommand << ", " << pLOEvent->m_pArguments << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->postUnoCommand(priv->m_pDocument, pLOEvent->m_pCommand, pLOEvent->m_pArguments, pLOEvent->m_bNotifyWhenFinished);
+}
+
+static void
+paintTileInThread (gpointer data)
+{
+    GTask* task = G_TASK(data);
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    gint nTileSizePixelsScaled = nTileSizePixels * nScaleFactor;
+
+    // check if "source" tile buffer is different from "current" tile buffer
+    if (pLOEvent->m_pTileBuffer != &*priv->m_pTileBuffer)
+    {
+        pLOEvent->m_pTileBuffer = nullptr;
+        g_task_return_new_error(task,
+                                LOK_TILEBUFFER_ERROR,
+                                LOK_TILEBUFFER_CHANGED,
+                                "TileBuffer has changed");
+        return;
+    }
+    std::unique_ptr<TileBuffer>& buffer = priv->m_pTileBuffer;
+    if (buffer->hasValidTile(pLOEvent->m_nPaintTileX, pLOEvent->m_nPaintTileY))
+        return;
+
+    cairo_surface_t *pSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, nTileSizePixelsScaled, nTileSizePixelsScaled);
+    if (cairo_surface_status(pSurface) != CAIRO_STATUS_SUCCESS)
+    {
+        cairo_surface_destroy(pSurface);
+        g_task_return_new_error(task,
+                                LOK_TILEBUFFER_ERROR,
+                                LOK_TILEBUFFER_MEMORY,
+                                "Error allocating Surface");
+        return;
+    }
+
+    unsigned char* pBuffer = cairo_image_surface_get_data(pSurface);
+    GdkRectangle aTileRectangle;
+    aTileRectangle.x = pixelToTwip(nTileSizePixelsScaled, pLOEvent->m_fPaintTileZoom * nScaleFactor) * pLOEvent->m_nPaintTileY;
+    aTileRectangle.y = pixelToTwip(nTileSizePixelsScaled, pLOEvent->m_fPaintTileZoom * nScaleFactor) * pLOEvent->m_nPaintTileX;
+
+    std::unique_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    ss.str(std::string());
+    GTimer* aTimer = g_timer_new();
+    gulong nElapsedMs;
+    ss << "lok::Document::paintTile(" << static_cast<void*>(pBuffer) << ", "
+        << nTileSizePixelsScaled << ", " << nTileSizePixelsScaled << ", "
+        << aTileRectangle.x << ", " << aTileRectangle.y << ", "
+        << pixelToTwip(nTileSizePixelsScaled, pLOEvent->m_fPaintTileZoom * nScaleFactor) << ", "
+        << pixelToTwip(nTileSizePixelsScaled, pLOEvent->m_fPaintTileZoom * nScaleFactor) << ")";
+
+    priv->m_pDocument->pClass->paintTile(priv->m_pDocument,
+                                         pBuffer,
+                                         nTileSizePixelsScaled, nTileSizePixelsScaled,
+                                         aTileRectangle.x, aTileRectangle.y,
+                                         pixelToTwip(nTileSizePixelsScaled, pLOEvent->m_fPaintTileZoom * nScaleFactor),
+                                         pixelToTwip(nTileSizePixelsScaled, pLOEvent->m_fPaintTileZoom * nScaleFactor));
+    aGuard.unlock();
+
+    g_timer_elapsed(aTimer, &nElapsedMs);
+    ss << " rendered in " << (nElapsedMs / 1000.) << " milliseconds";
+    g_info("%s", ss.str().c_str());
+    g_timer_destroy(aTimer);
+
+    cairo_surface_mark_dirty(pSurface);
+
+    // Its likely that while the tilebuffer has changed, one of the paint tile
+    // requests has passed the previous check at start of this function, and has
+    // rendered the tile already. We want to stop such rendered tiles from being
+    // stored in new tile buffer.
+    if (pLOEvent->m_pTileBuffer != &*priv->m_pTileBuffer)
+    {
+        pLOEvent->m_pTileBuffer = nullptr;
+        g_task_return_new_error(task,
+                                LOK_TILEBUFFER_ERROR,
+                                LOK_TILEBUFFER_CHANGED,
+                                "TileBuffer has changed");
+        return;
+    }
+
+    g_task_return_pointer(task, pSurface, reinterpret_cast<GDestroyNotify>(cairo_surface_destroy));
+}
+
+
+static void
+lokThreadFunc(gpointer data, gpointer /*user_data*/)
+{
+    GTask* task = G_TASK(data);
+    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
+    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    switch (pLOEvent->m_nType)
+    {
+    case LOK_LOAD_DOC:
+        openDocumentInThread(task);
+        break;
+    case LOK_POST_COMMAND:
+        postCommandInThread(task);
+        break;
+    case LOK_SET_EDIT:
+        setEditInThread(task);
+        break;
+    case LOK_SET_PART:
+        setPartInThread(task);
+        break;
+    case LOK_SET_PARTMODE:
+        setPartmodeInThread(task);
+        break;
+    case LOK_POST_KEY:
+        // view-only/editable mode already checked during signal key signal emission
+        postKeyEventInThread(task);
+        break;
+    case LOK_PAINT_TILE:
+        paintTileInThread(task);
+        break;
+    case LOK_POST_MOUSE_EVENT:
+        postMouseEventInThread(task);
+        break;
+    case LOK_SET_GRAPHIC_SELECTION:
+        if (priv->m_bEdit)
+            setGraphicSelectionInThread(task);
+        else
+            g_info ("LOK_SET_GRAPHIC_SELECTION: skipping graphical operation in view-only mode");
+        break;
+    case LOK_SET_CLIENT_ZOOM:
+        setClientZoomInThread(task);
+        break;
+    }
+
+    g_object_unref(task);
+}
+
+static void
+onStyleContextChanged (LOKDocView* pDocView)
+{
+    // The scale factor might have changed
+    updateClientZoom (pDocView);
+    gtk_widget_queue_draw (GTK_WIDGET (pDocView));
+}
+
+static void lok_doc_view_init (LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    priv.m_pImpl = new LOKDocViewPrivateImpl();
+
+    gtk_widget_add_events(GTK_WIDGET(pDocView),
+                          GDK_BUTTON_PRESS_MASK
+                          |GDK_BUTTON_RELEASE_MASK
+                          |GDK_BUTTON_MOTION_MASK
+                          |GDK_KEY_PRESS_MASK
+                          |GDK_KEY_RELEASE_MASK);
+
+    priv->lokThreadPool = g_thread_pool_new(lokThreadFunc,
+                                            nullptr,
+                                            1,
+                                            FALSE,
+                                            nullptr);
+
+    g_signal_connect (pDocView, "style-updated", G_CALLBACK(onStyleContextChanged), nullptr);
+}
+
+static void lok_doc_view_set_property (GObject* object, guint propId, const GValue *value, GParamSpec *pspec)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (object);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    bool bDocPasswordEnabled = priv->m_nLOKFeatures & LOK_FEATURE_DOCUMENT_PASSWORD;
+    bool bDocPasswordToModifyEnabled = priv->m_nLOKFeatures & LOK_FEATURE_DOCUMENT_PASSWORD_TO_MODIFY;
+    bool bTiledAnnotationsEnabled = !(priv->m_nLOKFeatures & LOK_FEATURE_NO_TILED_ANNOTATIONS);
+
+    switch (propId)
+    {
+    case PROP_LO_PATH:
+        priv->m_aLOPath = g_value_get_string (value);
+        break;
+    case PROP_LO_UNIPOLL:
+        priv->m_bUnipoll = g_value_get_boolean (value);
+        break;
+    case PROP_LO_POINTER:
+        priv->m_pOffice = static_cast<LibreOfficeKit*>(g_value_get_pointer(value));
+        break;
+    case PROP_USER_PROFILE_URL:
+        if (const gchar* pUserProfile = g_value_get_string(value))
+            priv->m_aUserProfileURL = pUserProfile;
+        break;
+    case PROP_DOC_PATH:
+        priv->m_aDocPath = g_value_get_string (value);
+        break;
+    case PROP_DOC_POINTER:
+        priv->m_pDocument = static_cast<LibreOfficeKitDocument*>(g_value_get_pointer(value));
+        priv->m_eDocumentType = static_cast<LibreOfficeKitDocumentType>(priv->m_pDocument->pClass->getDocumentType(priv->m_pDocument));
+        break;
+    case PROP_EDITABLE:
+        lok_doc_view_set_edit (pDocView, g_value_get_boolean (value));
+        break;
+    case PROP_ZOOM:
+        lok_doc_view_set_zoom (pDocView, g_value_get_float (value));
+        break;
+    case PROP_DOC_WIDTH:
+        priv->m_nDocumentWidthTwips = g_value_get_long (value);
+        break;
+    case PROP_DOC_HEIGHT:
+        priv->m_nDocumentHeightTwips = g_value_get_long (value);
+        break;
+    case PROP_DOC_PASSWORD:
+        if (bool(g_value_get_boolean (value)) != bDocPasswordEnabled)
+        {
+            priv->m_nLOKFeatures = priv->m_nLOKFeatures ^ LOK_FEATURE_DOCUMENT_PASSWORD;
+            priv->m_pOffice->pClass->setOptionalFeatures(priv->m_pOffice, priv->m_nLOKFeatures);
+        }
+        break;
+    case PROP_DOC_PASSWORD_TO_MODIFY:
+        if ( bool(g_value_get_boolean (value)) != bDocPasswordToModifyEnabled)
+        {
+            priv->m_nLOKFeatures = priv->m_nLOKFeatures ^ LOK_FEATURE_DOCUMENT_PASSWORD_TO_MODIFY;
+            priv->m_pOffice->pClass->setOptionalFeatures(priv->m_pOffice, priv->m_nLOKFeatures);
+        }
+        break;
+    case PROP_TILED_ANNOTATIONS:
+        if ( bool(g_value_get_boolean (value)) != bTiledAnnotationsEnabled)
+        {
+            priv->m_nLOKFeatures = priv->m_nLOKFeatures ^ LOK_FEATURE_NO_TILED_ANNOTATIONS;
+            priv->m_pOffice->pClass->setOptionalFeatures(priv->m_pOffice, priv->m_nLOKFeatures);
+        }
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, propId, pspec);
+    }
+}
+
+static void lok_doc_view_get_property (GObject* object, guint propId, GValue *value, GParamSpec *pspec)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (object);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    switch (propId)
+    {
+    case PROP_LO_PATH:
+        g_value_set_string (value, priv->m_aLOPath.c_str());
+        break;
+    case PROP_LO_UNIPOLL:
+        g_value_set_boolean (value, priv->m_bUnipoll);
+        break;
+    case PROP_LO_POINTER:
+        g_value_set_pointer(value, priv->m_pOffice);
+        break;
+    case PROP_USER_PROFILE_URL:
+        g_value_set_string(value, priv->m_aUserProfileURL.c_str());
+        break;
+    case PROP_DOC_PATH:
+        g_value_set_string (value, priv->m_aDocPath.c_str());
+        break;
+    case PROP_DOC_POINTER:
+        g_value_set_pointer(value, priv->m_pDocument);
+        break;
+    case PROP_EDITABLE:
+        g_value_set_boolean (value, priv->m_bEdit);
+        break;
+    case PROP_LOAD_PROGRESS:
+        g_value_set_double (value, priv->m_nLoadProgress);
+        break;
+    case PROP_ZOOM:
+        g_value_set_float (value, priv->m_fZoom);
+        break;
+    case PROP_IS_LOADING:
+        g_value_set_boolean (value, priv->m_bIsLoading);
+        break;
+    case PROP_IS_INITIALIZED:
+        g_value_set_boolean (value, priv->m_bInit);
+        break;
+    case PROP_DOC_WIDTH:
+        g_value_set_long (value, priv->m_nDocumentWidthTwips);
+        break;
+    case PROP_DOC_HEIGHT:
+        g_value_set_long (value, priv->m_nDocumentHeightTwips);
+        break;
+    case PROP_CAN_ZOOM_IN:
+        g_value_set_boolean (value, priv->m_bCanZoomIn);
+        break;
+    case PROP_CAN_ZOOM_OUT:
+        g_value_set_boolean (value, priv->m_bCanZoomOut);
+        break;
+    case PROP_DOC_PASSWORD:
+        g_value_set_boolean (value, (priv->m_nLOKFeatures & LOK_FEATURE_DOCUMENT_PASSWORD) != 0);
+        break;
+    case PROP_DOC_PASSWORD_TO_MODIFY:
+        g_value_set_boolean (value, (priv->m_nLOKFeatures & LOK_FEATURE_DOCUMENT_PASSWORD_TO_MODIFY) != 0);
+        break;
+    case PROP_TILED_ANNOTATIONS:
+        g_value_set_boolean (value, !(priv->m_nLOKFeatures & LOK_FEATURE_NO_TILED_ANNOTATIONS));
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, propId, pspec);
+    }
+}
+
+static gboolean lok_doc_view_draw (GtkWidget* pWidget, cairo_t* pCairo)
+{
+    LOKDocView *pDocView = LOK_DOC_VIEW (pWidget);
+
+    renderDocument (pDocView, pCairo);
+    renderOverlay (pDocView, pCairo);
+
+    return FALSE;
+}
+
+//rhbz#1444437 finalize may not occur immediately when this widget is destroyed
+//it may happen during GC of javascript, e.g. in gnome-documents but "destroy"
+//will be called promptly, so close documents in destroy, not finalize
+static void lok_doc_view_destroy (GtkWidget* widget)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (widget);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    // Ignore notifications sent to this view on shutdown.
+    std::unique_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    if (priv->m_pDocument)
+    {
+        priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+        priv->m_pDocument->pClass->registerCallback(priv->m_pDocument, nullptr, nullptr);
+    }
+
+    if (priv->lokThreadPool)
+    {
+        g_thread_pool_free(priv->lokThreadPool, true, true);
+        priv->lokThreadPool = nullptr;
+    }
+
+    aGuard.unlock();
+
+    if (priv->m_pDocument)
+    {
+        if (priv->m_pDocument->pClass->getViewsCount(priv->m_pDocument) > 1)
+        {
+            priv->m_pDocument->pClass->destroyView(priv->m_pDocument, priv->m_nViewId);
+        }
+        else
+        {
+            if (priv->m_pDocument)
+            {
+                priv->m_pDocument->pClass->destroy (priv->m_pDocument);
+                priv->m_pDocument = nullptr;
+            }
+            if (priv->m_pOffice)
+            {
+                priv->m_pOffice->pClass->destroy (priv->m_pOffice);
+                priv->m_pOffice = nullptr;
+            }
+        }
+    }
+
+    GTK_WIDGET_CLASS (lok_doc_view_parent_class)->destroy (widget);
+}
+
+static void lok_doc_view_finalize (GObject* object)
+{
+    LOKDocView* pDocView = LOK_DOC_VIEW (object);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    delete priv.m_pImpl;
+    priv.m_pImpl = nullptr;
+
+    G_OBJECT_CLASS (lok_doc_view_parent_class)->finalize (object);
+}
+
+// kicks the mainloop awake
+static gboolean timeout_wakeup(void *)
+{
+    return FALSE;
+}
+
+// integrate our mainloop with LOK's
+static int lok_poll_callback(void*, int timeoutUs)
+{
+    if (timeoutUs)
+    {
+        guint timeout = g_timeout_add(timeoutUs / 1000, timeout_wakeup, nullptr);
+        g_main_context_iteration(nullptr, true);
+        g_source_remove(timeout);
+    }
+    else
+        g_main_context_iteration(nullptr, FALSE);
+
+    return 0;
+}
+
+// thread-safe wakeup of our mainloop
+static void lok_wake_callback(void *)
+{
+    g_main_context_wakeup(nullptr);
+}
+
+static gboolean spin_lok_loop(void *pData)
+{
+    LOKDocView *pDocView = LOK_DOC_VIEW (pData);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    priv->m_pOffice->pClass->runLoop(priv->m_pOffice, lok_poll_callback, lok_wake_callback, nullptr);
+    return FALSE;
+}
+
+// Update the client's view size
+static void updateClientZoom(LOKDocView *pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    gint nTileSizePixelsScaled = nTileSizePixels * nScaleFactor;
+    GError* error = nullptr;
+
+    GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+    LOEvent* pLOEvent = new LOEvent(LOK_SET_CLIENT_ZOOM);
+    pLOEvent->m_nTilePixelWidth = nTileSizePixelsScaled;
+    pLOEvent->m_nTilePixelHeight = nTileSizePixelsScaled;
+    pLOEvent->m_nTileTwipWidth = pixelToTwip(nTileSizePixelsScaled, priv->m_fZoom * nScaleFactor);
+    pLOEvent->m_nTileTwipHeight = pixelToTwip(nTileSizePixelsScaled, priv->m_fZoom * nScaleFactor);
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_SET_CLIENT_ZOOM: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+
+    priv->m_nTileSizeTwips = pixelToTwip(nTileSizePixelsScaled, priv->m_fZoom * nScaleFactor);
+}
+
+static gboolean lok_doc_view_initable_init (GInitable *initable, GCancellable* /*cancellable*/, GError **error)
+{
+    LOKDocView *pDocView = LOK_DOC_VIEW (initable);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    if (priv->m_pOffice != nullptr)
+        return true;
+
+    if (priv->m_bUnipoll)
+        g_setenv("SAL_LOK_OPTIONS", "unipoll", FALSE);
+
+    priv->m_pOffice = lok_init_2(priv->m_aLOPath.c_str(), priv->m_aUserProfileURL.empty() ? nullptr : priv->m_aUserProfileURL.c_str());
+
+    if (priv->m_pOffice == nullptr)
+    {
+        g_set_error (error,
+                     g_quark_from_static_string ("LOK initialization error"), 0,
+                     "Failed to get LibreOfficeKit context. Make sure path (%s) is correct",
+                     priv->m_aLOPath.c_str());
+        return FALSE;
+    }
+    priv->m_nLOKFeatures |= LOK_FEATURE_PART_IN_INVALIDATION_CALLBACK;
+    priv->m_nLOKFeatures |= LOK_FEATURE_VIEWID_IN_VISCURSOR_INVALIDATION_CALLBACK;
+    priv->m_pOffice->pClass->setOptionalFeatures(priv->m_pOffice, priv->m_nLOKFeatures);
+
+    if (priv->m_bUnipoll)
+        g_idle_add(spin_lok_loop, pDocView);
+
+    return true;
+}
+
+static void lok_doc_view_initable_iface_init (GInitableIface *iface)
+{
+    iface->init = lok_doc_view_initable_init;
+}
+
+static void lok_doc_view_class_init (LOKDocViewClass* pClass)
+{
+    GObjectClass *pGObjectClass = G_OBJECT_CLASS(pClass);
+    GtkWidgetClass *pWidgetClass = GTK_WIDGET_CLASS(pClass);
+
+    pGObjectClass->get_property = lok_doc_view_get_property;
+    pGObjectClass->set_property = lok_doc_view_set_property;
+    pGObjectClass->finalize = lok_doc_view_finalize;
+
+    pWidgetClass->draw = lok_doc_view_draw;
+    pWidgetClass->button_press_event = lok_doc_view_signal_button;
+    pWidgetClass->button_release_event = lok_doc_view_signal_button;
+    pWidgetClass->key_press_event = signalKey;
+    pWidgetClass->key_release_event = signalKey;
+    pWidgetClass->motion_notify_event = lok_doc_view_signal_motion;
+    pWidgetClass->destroy = lok_doc_view_destroy;
+
+    /**
+     * LOKDocView:lopath:
+     *
+     * The absolute path of the LibreOffice install.
+     */
+    properties[PROP_LO_PATH] =
+        g_param_spec_string("lopath",
+                            "LO Path",
+                            "LibreOffice Install Path",
+                            nullptr,
+                            static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT_ONLY |
+                                                     G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:unipoll:
+     *
+     * Whether we use our own unified polling mainloop in place of glib's
+     */
+    properties[PROP_LO_UNIPOLL] =
+        g_param_spec_boolean("unipoll",
+                             "Unified Polling",
+                             "Whether we use a custom unified polling loop",
+                             FALSE,
+                             static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT_ONLY |
+                                                      G_PARAM_STATIC_STRINGS));
+    /**
+     * LOKDocView:lopointer:
+     *
+     * A LibreOfficeKit* in case lok_init() is already called
+     * previously.
+     */
+    properties[PROP_LO_POINTER] =
+        g_param_spec_pointer("lopointer",
+                             "LO Pointer",
+                             "A LibreOfficeKit* from lok_init()",
+                             static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT_ONLY |
+                                                      G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:userprofileurl:
+     *
+     * The absolute path of the LibreOffice user profile.
+     */
+    properties[PROP_USER_PROFILE_URL] =
+        g_param_spec_string("userprofileurl",
+                            "User profile path",
+                            "LibreOffice user profile path",
+                            nullptr,
+                            static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT_ONLY |
+                                                     G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:docpath:
+     *
+     * The path of the document that is currently being viewed.
+     */
+    properties[PROP_DOC_PATH] =
+        g_param_spec_string("docpath",
+                            "Document Path",
+                            "The URI of the document to open",
+                            nullptr,
+                            static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                     G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:docpointer:
+     *
+     * A LibreOfficeKitDocument* in case documentLoad() is already called
+     * previously.
+     */
+    properties[PROP_DOC_POINTER] =
+        g_param_spec_pointer("docpointer",
+                             "Document Pointer",
+                             "A LibreOfficeKitDocument* from documentLoad()",
+                             static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                      G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:editable:
+     *
+     * Whether the document loaded inside of #LOKDocView is editable or not.
+     */
+    properties[PROP_EDITABLE] =
+        g_param_spec_boolean("editable",
+                             "Editable",
+                             "Whether the content is in edit mode or not",
+                             FALSE,
+                             static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                      G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:load-progress:
+     *
+     * The percent completion of the current loading operation of the
+     * document. This can be used for progress bars. Note that this is not a
+     * very accurate progress indicator, and its value might reset it couple of
+     * times to 0 and start again. You should not rely on its numbers.
+     */
+    properties[PROP_LOAD_PROGRESS] =
+        g_param_spec_double("load-progress",
+                            "Estimated Load Progress",
+                            "Shows the progress of the document load operation",
+                            0.0, 1.0, 0.0,
+                            static_cast<GParamFlags>(G_PARAM_READABLE |
+                                                     G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:zoom-level:
+     *
+     * The current zoom level of the document loaded inside #LOKDocView. The
+     * default value is 1.0.
+     */
+    properties[PROP_ZOOM] =
+        g_param_spec_float("zoom-level",
+                           "Zoom Level",
+                           "The current zoom level of the content",
+                           0, 5.0, 1.0,
+                           static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                    G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:is-loading:
+     *
+     * Whether the requested document is being loaded or not. %TRUE if it is
+     * being loaded, otherwise %FALSE.
+     */
+    properties[PROP_IS_LOADING] =
+        g_param_spec_boolean("is-loading",
+                             "Is Loading",
+                             "Whether the view is loading a document",
+                             FALSE,
+                             static_cast<GParamFlags>(G_PARAM_READABLE |
+                                                      G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:is-initialized:
+     *
+     * Whether the requested document has completely loaded or not.
+     */
+    properties[PROP_IS_INITIALIZED] =
+        g_param_spec_boolean("is-initialized",
+                             "Has initialized",
+                             "Whether the view has completely initialized",
+                             FALSE,
+                             static_cast<GParamFlags>(G_PARAM_READABLE |
+                                                      G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:doc-width:
+     *
+     * The width of the currently loaded document in #LOKDocView in twips.
+     */
+    properties[PROP_DOC_WIDTH] =
+        g_param_spec_long("doc-width",
+                          "Document Width",
+                          "Width of the document in twips",
+                          0, G_MAXLONG, 0,
+                          static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                   G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:doc-height:
+     *
+     * The height of the currently loaded document in #LOKDocView in twips.
+     */
+    properties[PROP_DOC_HEIGHT] =
+        g_param_spec_long("doc-height",
+                          "Document Height",
+                          "Height of the document in twips",
+                          0, G_MAXLONG, 0,
+                          static_cast<GParamFlags>(G_PARAM_READWRITE |
+                                                   G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:can-zoom-in:
+     *
+     * It tells whether the view can further be zoomed in or not.
+     */
+    properties[PROP_CAN_ZOOM_IN] =
+        g_param_spec_boolean("can-zoom-in",
+                             "Can Zoom In",
+                             "Whether the view can be zoomed in further",
+                             true,
+                             static_cast<GParamFlags>(G_PARAM_READABLE
+                                                      | G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:can-zoom-out:
+     *
+     * It tells whether the view can further be zoomed out or not.
+     */
+    properties[PROP_CAN_ZOOM_OUT] =
+        g_param_spec_boolean("can-zoom-out",
+                             "Can Zoom Out",
+                             "Whether the view can be zoomed out further",
+                             true,
+                             static_cast<GParamFlags>(G_PARAM_READABLE
+                                                      | G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:doc-password:
+     *
+     * Set it to true if client supports providing password for viewing
+     * password protected documents
+     */
+    properties[PROP_DOC_PASSWORD] =
+        g_param_spec_boolean("doc-password",
+                             "Document password capability",
+                             "Whether client supports providing document passwords",
+                             FALSE,
+                             static_cast<GParamFlags>(G_PARAM_READWRITE
+                                                      | G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:doc-password-to-modify:
+     *
+     * Set it to true if client supports providing password for edit-protected documents
+     */
+    properties[PROP_DOC_PASSWORD_TO_MODIFY] =
+        g_param_spec_boolean("doc-password-to-modify",
+                             "Edit document password capability",
+                             "Whether the client supports providing passwords to edit documents",
+                             FALSE,
+                             static_cast<GParamFlags>(G_PARAM_READWRITE
+                                                      | G_PARAM_STATIC_STRINGS));
+
+    /**
+     * LOKDocView:tiled-annotations-rendering:
+     *
+     * Set it to false if client does not want LO to render comments in tiles and
+     * instead interested in using comments API to access comments
+     */
+    properties[PROP_TILED_ANNOTATIONS] =
+        g_param_spec_boolean("tiled-annotations",
+                             "Render comments in tiles",
+                             "Whether the client wants in tile comment rendering",
+                             true,
+                             static_cast<GParamFlags>(G_PARAM_READWRITE
+                                                      | G_PARAM_STATIC_STRINGS));
+
+    g_object_class_install_properties(pGObjectClass, PROP_LAST, properties);
+
+    /**
+     * LOKDocView::load-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @fLoadProgress: the new progress value
+     */
+    doc_view_signals[LOAD_CHANGED] =
+        g_signal_new("load-changed",
+                     G_TYPE_FROM_CLASS (pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__DOUBLE,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_DOUBLE);
+
+    /**
+     * LOKDocView::edit-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @bEdit: the new edit value of the view
+     */
+    doc_view_signals[EDIT_CHANGED] =
+        g_signal_new("edit-changed",
+                     G_TYPE_FROM_CLASS (pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__BOOLEAN,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_BOOLEAN);
+
+    /**
+     * LOKDocView::command-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: the command that was changed
+     */
+    doc_view_signals[COMMAND_CHANGED] =
+        g_signal_new("command-changed",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__STRING,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::search-not-found:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: the string for which the search was not found.
+     */
+    doc_view_signals[SEARCH_NOT_FOUND] =
+        g_signal_new("search-not-found",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__STRING,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::part-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: the part number which the view changed to
+     */
+    doc_view_signals[PART_CHANGED] =
+        g_signal_new("part-changed",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__INT,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_INT);
+
+    /**
+     * LOKDocView::size-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: NULL, we just notify that want to notify the UI elements that are interested.
+     */
+    doc_view_signals[SIZE_CHANGED] =
+        g_signal_new("size-changed",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__VOID,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_INT);
+
+    /**
+     * LOKDocView::hyperlinked-clicked:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aHyperlink: the URI which the application should handle
+     */
+    doc_view_signals[HYPERLINK_CLICKED] =
+        g_signal_new("hyperlink-clicked",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__STRING,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::cursor-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @nX: The new cursor position (X coordinate) in pixels
+     * @nY: The new cursor position (Y coordinate) in pixels
+     * @nWidth: The width of new cursor
+     * @nHeight: The height of new cursor
+     */
+    doc_view_signals[CURSOR_CHANGED] =
+        g_signal_new("cursor-changed",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_generic,
+                     G_TYPE_NONE, 4,
+                     G_TYPE_INT, G_TYPE_INT,
+                     G_TYPE_INT, G_TYPE_INT);
+
+    /**
+     * LOKDocView::search-result-count:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: number of matches.
+     */
+    doc_view_signals[SEARCH_RESULT_COUNT] =
+        g_signal_new("search-result-count",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__STRING,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::command-result:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: JSON containing the info about the command that finished,
+     * and its success status.
+     */
+    doc_view_signals[COMMAND_RESULT] =
+        g_signal_new("command-result",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__STRING,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::address-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: formula text content
+     */
+    doc_view_signals[ADDRESS_CHANGED] =
+        g_signal_new("address-changed",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__STRING,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::formula-changed:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @aCommand: formula text content
+     */
+    doc_view_signals[FORMULA_CHANGED] =
+        g_signal_new("formula-changed",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__STRING,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::text-selection:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @bIsTextSelected: whether text selected is non-null
+     */
+    doc_view_signals[TEXT_SELECTION] =
+        g_signal_new("text-selection",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_VOID__BOOLEAN,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_BOOLEAN);
+
+    /**
+     * LOKDocView::password-required:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @pUrl: URL of the document for which password is required
+     * @bModify: whether password id required to modify the document
+     * This is true when password is required to edit the document,
+     * while it can still be viewed without password. In such cases, provide a NULL
+     * password for read-only access to the document.
+     * If false, password is required for opening the document, and document
+     * cannot be opened without providing a valid password.
+     *
+     * Password must be provided by calling lok_doc_view_set_document_password
+     * function with pUrl as provided by the callback.
+     *
+     * Upon entering an invalid password, another `password-required` signal is
+     * emitted.
+     * Upon entering a valid password, document starts to load.
+     * Upon entering a NULL password: if bModify is %TRUE, document starts to
+     * open in view-only mode, else loading of document is aborted.
+     */
+    doc_view_signals[PASSWORD_REQUIRED] =
+        g_signal_new("password-required",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_generic,
+                     G_TYPE_NONE, 2,
+                     G_TYPE_STRING,
+                     G_TYPE_BOOLEAN);
+
+    /**
+     * LOKDocView::comment:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @pComment: the JSON string containing comment notification
+     * The has following structure containing the information telling whether
+     * the comment has been added, deleted or modified.
+     * The example:
+     * {
+     *     "comment": {
+     *         "action": "Add",
+     *         "id": "11",
+     *         "parent": "4",
+     *         "author": "Unknown Author",
+     *         "text": "This is a comment",
+     *         "dateTime": "2016-08-18T13:13:00",
+     *         "anchorPos": "4529, 3906",
+     *         "textRange": "1418, 3906, 3111, 919"
+     *     }
+     * }
+     * 'action' can be 'Add', 'Remove' or 'Modify' depending on whether
+     *  comment has been added, removed or modified.
+     * 'parent' is a non-zero comment id if this comment is a reply comment,
+     *  otherwise it's a root comment.
+     */
+    doc_view_signals[COMMENT] =
+        g_signal_new("comment",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_generic,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::ruler:
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @pPayload: the JSON string containing the information about ruler properties
+     *
+     * The payload format is:
+     *
+     * {
+     *      "margin1": "...",
+     *      "margin2": "...",
+     *      "leftOffset": "...",
+     *      "pageOffset": "...",
+     *      "pageWidth": "...",
+     *      "unit": "..."
+     *  }
+     */
+    doc_view_signals[RULER] =
+        g_signal_new("ruler",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_generic,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::window::
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @pPayload: the JSON string containing the information about the window
+     *
+     * This signal emits information about external windows like dialogs, autopopups for now.
+     *
+     * The payload format of pPayload is:
+     *
+     * {
+     *    "id": "unique integer id of the dialog",
+     *    "action": "<see below>",
+     *    "type": "<see below>"
+     *    "rectangle": "x, y, width, height"
+     * }
+     *
+     * "type" tells the type of the window the action is associated with
+     *  - "dialog" - window is a dialog
+     *  - "child" - window is a floating window (combo boxes, etc.)
+     *
+     * "action" can take following values:
+     * - "created" - window is created in the backend, client can render it now
+     * - "title_changed" - window's title is changed
+     * - "size_changed" - window's size is changed
+     * - "invalidate" - the area as described by "rectangle" is invalidated
+     *    Clients must request the new area
+     * - "cursor_invalidate" - cursor is invalidated. New position is in "rectangle"
+     * - "cursor_visible" - cursor visible status is changed. Status is available
+     *    in "visible" field
+     * - "close" - window is closed
+     */
+    doc_view_signals[WINDOW] =
+        g_signal_new("window",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_generic,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+
+    /**
+     * LOKDocView::invalidate-header::
+     * @pDocView: the #LOKDocView on which the signal is emitted
+     * @pPayload: can be either "row", "column", or "all".
+     *
+     * The column/row header is no more valid because of a column/row insertion
+     * or a similar event. Clients must query a new column/row header set.
+     *
+     * The payload says if we are invalidating a row or column header
+     */
+    doc_view_signals[INVALIDATE_HEADER] =
+        g_signal_new("invalidate-header",
+                     G_TYPE_FROM_CLASS(pGObjectClass),
+                     G_SIGNAL_RUN_FIRST,
+                     0,
+                     nullptr, nullptr,
+                     g_cclosure_marshal_generic,
+                     G_TYPE_NONE, 1,
+                     G_TYPE_STRING);
+}
+
+SAL_DLLPUBLIC_EXPORT GtkWidget*
+lok_doc_view_new (const gchar* pPath, GCancellable *cancellable, GError **error)
+{
+    return GTK_WIDGET (g_initable_new (LOK_TYPE_DOC_VIEW, cancellable, error,
+                                       "lopath", pPath == nullptr ? LOK_PATH : pPath,
+                                       "halign", GTK_ALIGN_CENTER,
+                                       "valign", GTK_ALIGN_CENTER,
+                                       nullptr));
+}
+
+SAL_DLLPUBLIC_EXPORT GtkWidget*
+lok_doc_view_new_from_user_profile (const gchar* pPath, const gchar* pUserProfile, GCancellable *cancellable, GError **error)
+{
+    return GTK_WIDGET(g_initable_new(LOK_TYPE_DOC_VIEW, cancellable, error,
+                                     "lopath", pPath == nullptr ? LOK_PATH : pPath,
+                                     "userprofileurl", pUserProfile,
+                                     "halign", GTK_ALIGN_CENTER,
+                                     "valign", GTK_ALIGN_CENTER,
+                                     nullptr));
+}
+
+SAL_DLLPUBLIC_EXPORT GtkWidget* lok_doc_view_new_from_widget(LOKDocView* pOldLOKDocView,
+                                                             const gchar* pRenderingArguments)
+{
+    LOKDocViewPrivate& pOldPriv = getPrivate(pOldLOKDocView);
+    GtkWidget* pNewDocView = GTK_WIDGET(g_initable_new(LOK_TYPE_DOC_VIEW, /*cancellable=*/nullptr, /*error=*/nullptr,
+                                                       "lopath", pOldPriv->m_aLOPath.c_str(),
+                                                       "userprofileurl", pOldPriv->m_aUserProfileURL.c_str(),
+                                                       "lopointer", pOldPriv->m_pOffice,
+                                                       "docpointer", pOldPriv->m_pDocument,
+                                                       "halign", GTK_ALIGN_CENTER,
+                                                       "valign", GTK_ALIGN_CENTER,
+                                                       nullptr));
+
+    // No documentLoad(), just a createView().
+    LibreOfficeKitDocument* pDocument = lok_doc_view_get_document(LOK_DOC_VIEW(pNewDocView));
+    LOKDocViewPrivate& pNewPriv = getPrivate(LOK_DOC_VIEW(pNewDocView));
+    // Store the view id only later in postDocumentLoad(), as
+    // initializeForRendering() changes the id in Impress.
+    pDocument->pClass->createView(pDocument);
+    pNewPriv->m_aRenderingArguments = pRenderingArguments;
+
+    postDocumentLoad(pNewDocView);
+    return pNewDocView;
+}
+
+SAL_DLLPUBLIC_EXPORT gboolean
+lok_doc_view_open_document_finish (LOKDocView* pDocView, GAsyncResult* res, GError** error)
+{
+    GTask* task = G_TASK(res);
+
+    g_return_val_if_fail(g_task_is_valid(res, pDocView), false);
+    g_return_val_if_fail(g_task_get_source_tag(task) == lok_doc_view_open_document, false);
+    g_return_val_if_fail(error == nullptr || *error == nullptr, false);
+
+    return g_task_propagate_boolean(task, error);
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_open_document (LOKDocView* pDocView,
+                            const gchar* pPath,
+                            const gchar* pRenderingArguments,
+                            GCancellable* cancellable,
+                            GAsyncReadyCallback callback,
+                            gpointer userdata)
+{
+    GTask* task = g_task_new(pDocView, cancellable, callback, userdata);
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    GError* error = nullptr;
+
+    LOEvent* pLOEvent = new LOEvent(LOK_LOAD_DOC);
+
+    g_object_set(G_OBJECT(pDocView), "docpath", pPath, nullptr);
+    if (pRenderingArguments)
+        priv->m_aRenderingArguments = pRenderingArguments;
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+    g_task_set_source_tag(task, reinterpret_cast<gpointer>(lok_doc_view_open_document));
+
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_LOAD_DOC: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+}
+
+SAL_DLLPUBLIC_EXPORT LibreOfficeKitDocument*
+lok_doc_view_get_document (LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    return priv->m_pDocument;
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_set_visible_area (LOKDocView* pDocView, GdkRectangle* pVisibleArea)
+{
+    if (!pVisibleArea)
+        return;
+
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    priv->m_aVisibleArea = *pVisibleArea;
+    priv->m_bVisibleAreaSet = true;
+}
+
+namespace {
+// This used to be rtl::math::approxEqual() but since that isn't inline anymore
+// in rtl/math.hxx and was moved into libuno_sal as rtl_math_approxEqual() to
+// cater for representable integer cases and we don't want to link against
+// libuno_sal, we'll have to have an own implementation. The special large
+// integer cases seems not be needed here.
+bool lok_approxEqual(double a, double b)
+{
+    static const double e48 = 1.0 / (16777216.0 * 16777216.0);
+    if (a == b)
+        return true;
+    if (a == 0.0 || b == 0.0)
+        return false;
+    const double d = fabs(a - b);
+    return (d < fabs(a) * e48 && d < fabs(b) * e48);
+}
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_set_zoom (LOKDocView* pDocView, float fZoom)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    if (!priv->m_pDocument)
+        return;
+
+    // Clamp the input value in [MIN_ZOOM, MAX_ZOOM]
+    fZoom = fZoom < MIN_ZOOM ? MIN_ZOOM : fZoom;
+    fZoom = std::min(fZoom, MAX_ZOOM);
+
+    if (lok_approxEqual(fZoom, priv->m_fZoom))
+        return;
+
+    gint nScaleFactor = gtk_widget_get_scale_factor(GTK_WIDGET(pDocView));
+    gint nTileSizePixelsScaled = nTileSizePixels * nScaleFactor;
+    priv->m_fZoom = fZoom;
+    long nDocumentWidthPixels = twipToPixel(priv->m_nDocumentWidthTwips, fZoom * nScaleFactor);
+    long nDocumentHeightPixels = twipToPixel(priv->m_nDocumentHeightTwips, fZoom * nScaleFactor);
+    // Total number of columns in this document.
+    guint nColumns = ceil(static_cast<double>(nDocumentWidthPixels) / nTileSizePixelsScaled);
+    priv->m_pTileBuffer = std::make_unique<TileBuffer>(nColumns, nScaleFactor);
+    gtk_widget_set_size_request(GTK_WIDGET(pDocView),
+                                nDocumentWidthPixels / nScaleFactor,
+                                nDocumentHeightPixels / nScaleFactor);
+
+    g_object_notify_by_pspec(G_OBJECT(pDocView), properties[PROP_ZOOM]);
+
+    // set properties to indicate if view can be further zoomed in/out
+    bool bCanZoomIn  = priv->m_fZoom < MAX_ZOOM;
+    bool bCanZoomOut = priv->m_fZoom > MIN_ZOOM;
+    if (bCanZoomIn != bool(priv->m_bCanZoomIn))
+    {
+        priv->m_bCanZoomIn = bCanZoomIn;
+        g_object_notify_by_pspec(G_OBJECT(pDocView), properties[PROP_CAN_ZOOM_IN]);
+    }
+    if (bCanZoomOut != bool(priv->m_bCanZoomOut))
+    {
+        priv->m_bCanZoomOut = bCanZoomOut;
+        g_object_notify_by_pspec(G_OBJECT(pDocView), properties[PROP_CAN_ZOOM_OUT]);
+    }
+
+    updateClientZoom(pDocView);
+}
+
+SAL_DLLPUBLIC_EXPORT gfloat
+lok_doc_view_get_zoom (LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    return priv->m_fZoom;
+}
+
+SAL_DLLPUBLIC_EXPORT gint
+lok_doc_view_get_parts (LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return -1;
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    return priv->m_pDocument->pClass->getParts( priv->m_pDocument );
+}
+
+SAL_DLLPUBLIC_EXPORT gint
+lok_doc_view_get_part (LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return -1;
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    return priv->m_pDocument->pClass->getPart( priv->m_pDocument );
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_set_part (LOKDocView* pDocView, int nPart)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return;
+
+    if (nPart < 0 || nPart >= priv->m_nParts)
+    {
+        g_warning("Invalid part request : %d", nPart);
+        return;
+    }
+
+    GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+    LOEvent* pLOEvent = new LOEvent(LOK_SET_PART);
+    GError* error = nullptr;
+
+    pLOEvent->m_nPart = nPart;
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_SET_PART: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+    priv->m_nPartId = nPart;
+}
+
+SAL_DLLPUBLIC_EXPORT gchar*
+lok_doc_view_get_part_name (LOKDocView* pDocView, int nPart)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return nullptr;
+
+    std::scoped_lock<std::mutex> aGuard(g_aLOKMutex);
+    std::stringstream ss;
+    ss << "lok::Document::setView(" << priv->m_nViewId << ")";
+    g_info("%s", ss.str().c_str());
+    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
+    return priv->m_pDocument->pClass->getPartName( priv->m_pDocument, nPart );
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_set_partmode(LOKDocView* pDocView,
+                          int nPartMode)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return;
+
+    GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+    LOEvent* pLOEvent = new LOEvent(LOK_SET_PARTMODE);
+    GError* error = nullptr;
+
+    pLOEvent->m_nPartMode = nPartMode;
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_SET_PARTMODE: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_reset_view(LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    if (priv->m_pTileBuffer != nullptr)
+        priv->m_pTileBuffer->resetAllTiles();
+    priv->m_nLoadProgress = 0.0;
+
+    memset(&priv->m_aVisibleCursor, 0, sizeof(priv->m_aVisibleCursor));
+    priv->m_bCursorOverlayVisible = false;
+    priv->m_bCursorVisible = false;
+
+    priv->m_nLastButtonPressTime = 0;
+    priv->m_nLastButtonReleaseTime = 0;
+    priv->m_aTextSelectionRectangles.clear();
+
+    memset(&priv->m_aTextSelectionStart, 0, sizeof(priv->m_aTextSelectionStart));
+    memset(&priv->m_aTextSelectionEnd, 0, sizeof(priv->m_aTextSelectionEnd));
+    memset(&priv->m_aGraphicSelection, 0, sizeof(priv->m_aGraphicSelection));
+    priv->m_bInDragGraphicSelection = false;
+    memset(&priv->m_aCellCursor, 0, sizeof(priv->m_aCellCursor));
+
+    cairo_surface_destroy(priv->m_pHandleStart);
+    priv->m_pHandleStart = nullptr;
+    memset(&priv->m_aHandleStartRect, 0, sizeof(priv->m_aHandleStartRect));
+    priv->m_bInDragStartHandle = false;
+
+    cairo_surface_destroy(priv->m_pHandleMiddle);
+    priv->m_pHandleMiddle = nullptr;
+    memset(&priv->m_aHandleMiddleRect, 0, sizeof(priv->m_aHandleMiddleRect));
+    priv->m_bInDragMiddleHandle = false;
+
+    cairo_surface_destroy(priv->m_pHandleEnd);
+    priv->m_pHandleEnd = nullptr;
+    memset(&priv->m_aHandleEndRect, 0, sizeof(priv->m_aHandleEndRect));
+    priv->m_bInDragEndHandle = false;
+
+    memset(&priv->m_aGraphicHandleRects, 0, sizeof(priv->m_aGraphicHandleRects));
+    memset(&priv->m_bInDragGraphicHandles, 0, sizeof(priv->m_bInDragGraphicHandles));
+
+    gtk_widget_queue_draw(GTK_WIDGET(pDocView));
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_set_edit(LOKDocView* pDocView,
+                      gboolean bEdit)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return;
+
+    GTask* task = g_task_new(pDocView, nullptr, nullptr, nullptr);
+    LOEvent* pLOEvent = new LOEvent(LOK_SET_EDIT);
+    GError* error = nullptr;
+
+    pLOEvent->m_bEdit = bEdit;
+    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+
+    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);
+    if (error != nullptr)
+    {
+        g_warning("Unable to call LOK_SET_EDIT: %s", error->message);
+        g_clear_error(&error);
+    }
+    g_object_unref(task);
+}
+
+SAL_DLLPUBLIC_EXPORT gboolean
+lok_doc_view_get_edit (LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    return priv->m_bEdit;
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_post_command (LOKDocView* pDocView,
+                           const gchar* pCommand,
+                           const gchar* pArguments,
+                           gboolean bNotifyWhenFinished)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    if (!priv->m_pDocument)
+        return;
+
+    if (priv->m_bEdit)
+        LOKPostCommand(pDocView, pCommand, pArguments, bNotifyWhenFinished);
+    else
+        g_info ("LOK_POST_COMMAND: ignoring commands in view-only mode");
+}
+
+SAL_DLLPUBLIC_EXPORT gchar *
+lok_doc_view_get_command_values (LOKDocView* pDocView,
+                                 const gchar* pCommand)
+{
+    g_return_val_if_fail (LOK_IS_DOC_VIEW (pDocView), nullptr);
+    g_return_val_if_fail (pCommand != nullptr, nullptr);
+
+    LibreOfficeKitDocument* pDocument = lok_doc_view_get_document(pDocView);
+    if (!pDocument)
+        return nullptr;
+
+    return pDocument->pClass->getCommandValues(pDocument, pCommand);
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_find_prev (LOKDocView* pDocView,
+                        const gchar* pText,
+                        gboolean bHighlightAll)
+{
+    doSearch(pDocView, pText, true, bHighlightAll);
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_find_next (LOKDocView* pDocView,
+                        const gchar* pText,
+                        gboolean bHighlightAll)
+{
+    doSearch(pDocView, pText, false, bHighlightAll);
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_highlight_all (LOKDocView* pDocView,
+                            const gchar* pText)
+{
+    doSearch(pDocView, pText, false, true);
+}
+
+SAL_DLLPUBLIC_EXPORT gchar*
+lok_doc_view_copy_selection (LOKDocView* pDocView,
+                             const gchar* pMimeType,
+                             gchar** pUsedMimeType)
+{
+    LibreOfficeKitDocument* pDocument = lok_doc_view_get_document(pDocView);
+    if (!pDocument)
+        return nullptr;
+
+    std::stringstream ss;
+    ss << "lok::Document::getTextSelection('" << pMimeType << "')";
+    g_info("%s", ss.str().c_str());
+    return pDocument->pClass->getTextSelection(pDocument, pMimeType, pUsedMimeType);
+}
+
+SAL_DLLPUBLIC_EXPORT gboolean
+lok_doc_view_paste (LOKDocView* pDocView,
+                    const gchar* pMimeType,
+                    const gchar* pData,
+                    gsize nSize)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    LibreOfficeKitDocument* pDocument = priv->m_pDocument;
+    bool ret = false;
+
+    if (!pDocument)
+        return false;
+
+    if (!priv->m_bEdit)
+    {
+        g_info ("ignoring paste in view-only mode");
+        return ret;
+    }
+
+    if (pData)
+    {
+        std::stringstream ss;
+        ss << "lok::Document::paste('" << pMimeType << "', '" << std::string(pData, nSize) << ", "<<nSize<<"')";
+        g_info("%s", ss.str().c_str());
+        ret = pDocument->pClass->paste(pDocument, pMimeType, pData, nSize);
+    }
+
+    return ret;
+}
+
+SAL_DLLPUBLIC_EXPORT void
+lok_doc_view_set_document_password (LOKDocView* pDocView,
+                                    const gchar* pURL,
+                                    const gchar* pPassword)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    priv->m_pOffice->pClass->setDocumentPassword(priv->m_pOffice, pURL, pPassword);
+}
+
+SAL_DLLPUBLIC_EXPORT gchar*
+lok_doc_view_get_version_info (LOKDocView* pDocView)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+
+    return priv->m_pOffice->pClass->getVersionInfo(priv->m_pOffice);
+}
+
+
+SAL_DLLPUBLIC_EXPORT gfloat
+lok_doc_view_pixel_to_twip (LOKDocView* pDocView, float fInput)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    return pixelToTwip(fInput, priv->m_fZoom);
+}
+
+SAL_DLLPUBLIC_EXPORT gfloat
+lok_doc_view_twip_to_pixel (LOKDocView* pDocView, float fInput)
+{
+    LOKDocViewPrivate& priv = getPrivate(pDocView);
+    return twipToPixel(fInput, priv->m_fZoom);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/libreofficekit/source/gtk/tilebuffer.cxx b/libreofficekit/source/gtk/tilebuffer.cxx
new file mode 100644
index 000000000..82f0253d9
--- /dev/null
+++ b/libreofficekit/source/gtk/tilebuffer.cxx
@@ -0,0 +1,139 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "tilebuffer.hxx"
+
+
+/* ------------------
+   Utility functions
+   ------------------
+*/
+float pixelToTwip(float fInput, float zoom)
+{
+    return (fInput / DPI / zoom) * 1440.0f;
+}
+
+float twipToPixel(float fInput, float zoom)
+{
+    return fInput / 1440.0f * DPI * zoom;
+}
+
+/* ----------------------------
+   Tile class member functions
+   ----------------------------
+*/
+cairo_surface_t* Tile::getBuffer()
+{
+    return m_pBuffer;
+}
+
+void Tile::setSurface(cairo_surface_t *buffer)
+{
+    if (m_pBuffer == buffer)
+        return;
+    if (m_pBuffer)
+        cairo_surface_destroy(m_pBuffer);
+    if (buffer != nullptr)
+        cairo_surface_reference(buffer);
+    m_pBuffer = buffer;
+}
+
+/* ----------------------------------
+   TileBuffer class member functions
+   ----------------------------------
+*/
+void TileBuffer::resetAllTiles()
+{
+    for (auto & tile : m_mTiles)
+    {
+        tile.second.valid = false;
+    }
+}
+
+void TileBuffer::setInvalid(int x, int y, float fZoom, GTask* task,
+                            GThreadPool* lokThreadPool)
+{
+    int index = x * m_nWidth + y;
+    GError* error = nullptr;
+    if (m_mTiles.find(index) != m_mTiles.end())
+    {
+        m_mTiles[index].valid = false;
+
+        LOEvent* pLOEvent = new LOEvent(LOK_PAINT_TILE);
+        pLOEvent->m_nPaintTileX = x;
+        pLOEvent->m_nPaintTileY = y;
+        pLOEvent->m_fPaintTileZoom = fZoom;
+        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
+        g_thread_pool_push(lokThreadPool, g_object_ref(task), &error);
+        if (error != nullptr)
+        {
+            g_warning("Unable to call LOK_PAINT_TILE: %s", error->message);
+            g_clear_error(&error);
+        }
+    }
+}
+
+Tile& TileBuffer::getTile(int x, int y, GTask* task,
+                          GThreadPool* lokThreadPool)
+{
+    int index = x * m_nWidth + y;
+    GError* error = nullptr;
+
+    if (m_mTiles.find(index) != m_mTiles.end() && !m_mTiles[index].valid)
+    {
+        g_thread_pool_push(lokThreadPool, g_object_ref(task), &error);
+        if (error != nullptr)
+        {
+            g_warning("Unable to call LOK_PAINT_TILE: %s", error->message);
+            g_clear_error(&error);
+        }
+        return m_mTiles[index];
+    }
+    else if(m_mTiles.find(index) == m_mTiles.end())
+    {
+        g_thread_pool_push(lokThreadPool, g_object_ref(task), &error);
+        if (error != nullptr)
+        {
+            g_warning("Unable to call LOK_PAINT_TILE: %s", error->message);
+            g_clear_error(&error);
+        }
+        return m_DummyTile;
+    }
+
+    return m_mTiles[index];
+}
+
+void TileBuffer::setTile(int x, int y, cairo_surface_t *surface)
+{
+    int index = x * m_nWidth + y;
+
+    m_mTiles[index].setSurface(surface);
+    m_mTiles[index].valid = true;
+}
+
+bool TileBuffer::hasValidTile(int x, int y)
+{
+    int index = x * m_nWidth + y;
+    auto it = m_mTiles.find(index);
+    return (it != m_mTiles.end()) && it->second.valid;
+}
+
+void LOEvent::destroy(void* pMemory)
+{
+    LOEvent* pLOEvent = static_cast<LOEvent*>(pMemory);
+    delete pLOEvent;
+}
+
+GQuark
+LOKTileBufferErrorQuark()
+{
+    return g_quark_from_static_string("lok-tilebuffer-error");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/libreofficekit/source/gtk/tilebuffer.hxx b/libreofficekit/source/gtk/tilebuffer.hxx
new file mode 100644
index 000000000..9e7203b3b
--- /dev/null
+++ b/libreofficekit/source/gtk/tilebuffer.hxx
@@ -0,0 +1,278 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_TILEBUFFER_HXX
+#define INCLUDED_TILEBUFFER_HXX
+
+#include <cairo.h>
+#include <gio/gio.h>
+#include <glib.h>
+
+#include <map>
+
+#define LOK_TILEBUFFER_ERROR (LOKTileBufferErrorQuark())
+
+// We know that VirtualDevices use a DPI of 96.
+const int DPI = 96;
+// Lets use a square of side 256 pixels for each tile.
+const int nTileSizePixels = 256;
+
+/**
+   Converts the pixel value to zoom independent twip value.
+
+   @param fInput value to convert
+   @param zoom the current zoom level
+
+   @return the pixels value corresponding to given twip value
+*/
+float pixelToTwip(float fInput, float zoom);
+
+/**
+   Converts the zoom independent twip value pixel value.
+
+   @param fInput value to convert
+   @param zoom the current zoom level
+
+   @return the twip value corresponding to given pixel value
+*/
+float twipToPixel(float fInput, float zoom);
+
+/**
+   Gets GQuark identifying this tile buffer errors
+*/
+GQuark LOKTileBufferErrorQuark(void);
+
+/**
+   This class represents a single tile in the tile buffer.
+   It encloses a reference to GdkPixBuf containing the pixel data of the tile.
+*/
+class Tile
+{
+ public:
+    Tile() : valid(false), m_pBuffer(nullptr) {}
+    ~Tile()
+    {
+        if (m_pBuffer)
+            cairo_surface_destroy(m_pBuffer);
+    }
+
+    /**
+       Tells if this tile is valid or not. Initialised to 0 (invalid) during
+       object creation.
+    */
+    bool valid;
+
+    /// Function to get the pointer to enclosing cairo_surface_t
+    cairo_surface_t* getBuffer();
+    /// Used to set the pixel buffer of this object
+    void setSurface(cairo_surface_t*);
+
+private:
+    /// Pixel buffer data for this tile
+    cairo_surface_t *m_pBuffer;
+};
+
+/**
+   This class represents the tile buffer which is responsible for managing,
+   reusing and caching all the already rendered tiles. If the given tile is not
+   present in the buffer, call to LOK Document's (m_pLOKDocument) paintTile
+   method is made which fetches the rendered tile from LO core and store it in
+   buffer for future reuse.
+*/
+class TileBuffer
+{
+ public:
+ TileBuffer(int columns = 0, int scale = 1)
+     : m_nWidth(columns)
+    {
+        cairo_surface_t *pSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, nTileSizePixels * scale, nTileSizePixels * scale);
+        m_DummyTile.setSurface(pSurface);
+        cairo_surface_destroy(pSurface);
+    }
+
+    /**
+       Gets the underlying Tile object for given position. The position (0, 0)
+       points to the left top most tile of the buffer.
+
+       If the tile is not cached by the tile buffer, it makes a paintTile call
+       to LO core asking to render the given tile. It then stores the tile for
+       future reuse.
+
+       @param x the tile along the x-axis of the buffer
+       @param y the tile along the y-axis of the buffer
+       @param task GTask object containing the necessary data
+       @param pool GThreadPool managed by the widget instance used for all the
+       LOK calls made by widget. It is needed here because getTile invokes one
+       of the LOK call : paintTile.
+
+       @return the tile at the mentioned position (x, y)
+     */
+    Tile& getTile(int x, int y, GTask* task, GThreadPool* pool);
+
+    /*
+      Takes ownership of the surface and sets it on a tile at a given location
+    */
+    void  setTile(int x, int y, cairo_surface_t *surface);
+
+    /// Returns true if a valid tile exists at this location
+    bool hasValidTile(int x, int y);
+
+    /// Destroys all the tiles in the tile buffer; also frees the memory allocated
+    /// for all the Tile objects.
+    void resetAllTiles();
+    /**
+       Marks the tile as invalid. The tile (0, 0) is the left topmost tile in
+       the tile buffer.
+
+       @param x the position of tile along x-axis
+       @param y the position of tile along y-axis
+       @param zoom zoom factor of the document
+       @param task GTask object containing the necessary data
+       @param pool GThreadPool managed by the widget instance used for all the
+       LOK calls made by widget. It is needed here because setInvalid() invokes one
+       of the LOK call : paintTile.
+     */
+    void setInvalid(int x, int y, float zoom, GTask* task, GThreadPool*);
+
+private:
+    /// Stores all the tiles cached by this tile buffer.
+    std::map<int, Tile> m_mTiles;
+    /// Width of the current tile buffer (number of columns)
+    int m_nWidth;
+    /// Dummy tile
+    Tile m_DummyTile;
+};
+
+enum
+{
+    LOK_LOAD_DOC,
+    LOK_POST_COMMAND,
+    LOK_SET_EDIT,
+    LOK_SET_PARTMODE,
+    LOK_SET_PART,
+    LOK_POST_KEY,
+    LOK_PAINT_TILE,
+    LOK_POST_MOUSE_EVENT,
+    LOK_SET_GRAPHIC_SELECTION,
+    LOK_SET_CLIENT_ZOOM
+};
+
+enum
+{
+    LOK_TILEBUFFER_CHANGED,
+    LOK_TILEBUFFER_MEMORY
+};
+
+/**
+   A struct that we use to store the data about the LOK call.
+
+   Object of this type is passed with all the LOK calls,
+   so that they can be identified. Additionally, it also contains
+   the data that LOK call needs.
+*/
+struct LOEvent
+{
+    /// To identify the type of LOK call
+    int m_nType;
+
+    /// @name post_command parameters
+    ///@{
+    const gchar* m_pCommand;
+    gchar* m_pArguments;
+    gboolean m_bNotifyWhenFinished;
+    ///@}
+
+    /// set_edit parameter
+    gboolean m_bEdit;
+
+    /// set_partmode parameter
+    int m_nPartMode;
+
+    /// set_part parameter
+    int m_nPart;
+
+    /// @name postKeyEvent parameters
+    ///@{
+    int m_nKeyEvent;
+    int m_nCharCode;
+    int m_nKeyCode;
+    ///@}
+
+    /// @name paintTile parameters
+    ///@{
+    int m_nPaintTileX;
+    int m_nPaintTileY;
+    float m_fPaintTileZoom;
+    TileBuffer* m_pTileBuffer;
+    ///@}
+
+    /// @name postMouseEvent parameters
+    ///@{
+    int m_nPostMouseEventType;
+    int m_nPostMouseEventX;
+    int m_nPostMouseEventY;
+    int m_nPostMouseEventCount;
+    int m_nPostMouseEventButton;
+    int m_nPostMouseEventModifier;
+    ///@}
+
+    /// @name setGraphicSelection parameters
+    ///@{
+    int m_nSetGraphicSelectionType;
+    int m_nSetGraphicSelectionX;
+    int m_nSetGraphicSelectionY;
+    ///@}
+
+    /// @name setClientView parameters
+    ///@{
+    int m_nTilePixelWidth;
+    int m_nTilePixelHeight;
+    int m_nTileTwipWidth;
+    int m_nTileTwipHeight;
+    ///@}
+
+    /// Constructor to instantiate an object of type `type`.
+    explicit LOEvent(int type)
+        : m_nType(type)
+        , m_pCommand(nullptr)
+        , m_pArguments(nullptr)
+        , m_bNotifyWhenFinished(false)
+        , m_bEdit(false)
+        , m_nPartMode(0)
+        , m_nPart(0)
+        , m_nKeyEvent(0)
+        , m_nCharCode(0)
+        , m_nKeyCode(0)
+        , m_nPaintTileX(0)
+        , m_nPaintTileY(0)
+        , m_fPaintTileZoom(0)
+        , m_pTileBuffer(nullptr)
+        , m_nPostMouseEventType(0)
+        , m_nPostMouseEventX(0)
+        , m_nPostMouseEventY(0)
+        , m_nPostMouseEventCount(0)
+        , m_nPostMouseEventButton(0)
+        , m_nPostMouseEventModifier(0)
+        , m_nSetGraphicSelectionType(0)
+        , m_nSetGraphicSelectionX(0)
+        , m_nSetGraphicSelectionY(0)
+        , m_nTilePixelWidth(0)
+        , m_nTilePixelHeight(0)
+        , m_nTileTwipWidth(0)
+        , m_nTileTwipHeight(0)
+    {
+    }
+
+    /// Wrapper around delete to help GLib.
+    static void destroy(void* pMemory);
+};
+
+#endif // INCLUDED_TILEBUFFER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */