Adding upstream version 1.2.2.upstream/1.2.2upstream

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

1 files changed, 1886 insertions, 0 deletions

diff --git a/src/ui/clipboard.cpp b/src/ui/clipboard.cpp
new file mode 100644
index 0000000..a144af2
--- /dev/null
+++ b/src/ui/clipboard.cpp
@@ -0,0 +1,1886 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * System-wide clipboard management - implementation.
+ *//*
+ * Authors:
+ * see git history
+ *   Krzysztof Kosiński <tweenk@o2.pl>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Incorporates some code from selection-chemistry.cpp, see that file for more credits.
+ *   Abhishek Sharma
+ *   Tavmjong Bah
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "clipboard.h"
+
+#include <giomm/application.h>
+#include <glib/gstdio.h> // for g_file_set_contents etc., used in _onGet and paste
+#include <glibmm/i18n.h>
+#include <gtkmm/clipboard.h>
+
+#include <2geom/transforms.h>
+#include <2geom/path-sink.h>
+
+// TODO: reduce header bloat if possible
+
+#include "context-fns.h"
+#include "desktop-style.h" // for sp_desktop_set_style, used in _pasteStyle
+#include "desktop.h"
+#include "display/curve.h"
+#include "document.h"
+#include "extension/db.h" // extension database
+#include "extension/find_extension_by_mime.h"
+#include "extension/input.h"
+#include "extension/output.h"
+#include "file.h" // for file_import, used in _pasteImage
+#include "filter-chemistry.h"
+#include "gradient-drag.h"
+#include "helper/png-write.h"
+#include "id-clash.h"
+#include "inkgc/gc-core.h"
+#include "inkscape.h"
+#include "live_effects/lpe-bspline.h"
+#include "live_effects/lpe-spiro.h"
+#include "live_effects/lpeobject-reference.h"
+#include "live_effects/lpeobject.h"
+#include "live_effects/parameter/path.h"
+#include "message-stack.h"
+#include "object/box3d.h"
+#include "object/persp3d.h"
+#include "object/sp-clippath.h"
+#include "object/sp-defs.h"
+#include "object/sp-flowtext.h"
+#include "object/sp-gradient-reference.h"
+#include "object/sp-hatch.h"
+#include "object/sp-item-transform.h"
+#include "object/sp-linear-gradient.h"
+#include "object/sp-marker.h"
+#include "object/sp-mask.h"
+#include "object/sp-mesh-gradient.h"
+#include "object/sp-path.h"
+#include "object/sp-pattern.h"
+#include "object/sp-radial-gradient.h"
+#include "object/sp-rect.h"
+#include "object/sp-root.h"
+#include "object/sp-shape.h"
+#include "object/sp-textpath.h"
+#include "object/sp-use.h"
+#include "path-chemistry.h"
+#include "selection-chemistry.h"
+#include "style.h"
+#include "svg/css-ostringstream.h" // used in copy
+#include "svg/svg-color.h"
+#include "svg/svg.h" // for sp_svg_transform_write, used in _copySelection
+#include "text-chemistry.h"
+#include "text-editing.h"
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/multi-path-manipulator.h"
+#include "ui/tools/dropper-tool.h" // used in copy()
+#include "ui/tools/node-tool.h"
+#include "ui/tools/text-tool.h"
+#include "util/units.h"
+#include "xml/repr.h"
+#include "xml/sp-css-attr.h"
+
+/// Made up mimetype to represent Gdk::Pixbuf clipboard contents.
+#define CLIPBOARD_GDK_PIXBUF_TARGET "image/x-gdk-pixbuf"
+
+#define CLIPBOARD_TEXT_TARGET "text/plain"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+namespace Inkscape {
+namespace UI {
+
+/**
+ * Default implementation of the clipboard manager.
+ */
+class ClipboardManagerImpl : public ClipboardManager {
+public:
+    void copy(ObjectSet *set) override;
+    void copyPathParameter(Inkscape::LivePathEffect::PathParam *) override;
+    void copySymbol(Inkscape::XML::Node* symbol, gchar const* style, SPDocument *source) override;
+    bool paste(SPDesktop *desktop, bool in_place) override;
+    bool pasteStyle(ObjectSet *set) override;
+    bool pasteSize(ObjectSet *set, bool separately, bool apply_x, bool apply_y) override;
+    bool pastePathEffect(ObjectSet *set) override;
+    Glib::ustring getPathParameter(SPDesktop* desktop) override;
+    Glib::ustring getShapeOrTextObjectId(SPDesktop *desktop) override;
+    std::vector<Glib::ustring> getElementsOfType(SPDesktop *desktop, gchar const* type = "*", gint maxdepth = -1) override;
+    Glib::ustring getFirstObjectID() override;
+
+    ClipboardManagerImpl();
+    ~ClipboardManagerImpl() override;
+
+private:
+    void _cleanStyle(SPCSSAttr *);
+    void _copySelection(ObjectSet *);
+    void _copyCompleteStyle(SPItem *item, Inkscape::XML::Node *target, bool child = false);
+    void _copyUsedDefs(SPItem *);
+    void _copyGradient(SPGradient *);
+    void _copyPattern(SPPattern *);
+    void _copyHatch(SPHatch *);
+    void _copyTextPath(SPTextPath *);
+    bool _copyNodes(SPDesktop *desktop, ObjectSet *set);
+    Inkscape::XML::Node *_copyNode(Inkscape::XML::Node *, Inkscape::XML::Document *, Inkscape::XML::Node *);
+    Inkscape::XML::Node *_copyIgnoreDup(Inkscape::XML::Node *, Inkscape::XML::Document *, Inkscape::XML::Node *);
+
+    bool _pasteImage(SPDocument *doc);
+    bool _pasteText(SPDesktop *desktop);
+    bool _pasteNodes(SPDesktop *desktop, SPDocument *clipdoc, bool in_place);
+    void _applyPathEffect(SPItem *, gchar const *);
+    std::unique_ptr<SPDocument> _retrieveClipboard(Glib::ustring = "");
+
+    // clipboard callbacks
+    void _onGet(Gtk::SelectionData &, guint);
+    void _onClear();
+
+    // various helpers
+    void _createInternalClipboard();
+    void _discardInternalClipboard();
+    Inkscape::XML::Node *_createClipNode();
+    Geom::Scale _getScale(SPDesktop *desktop, Geom::Point const &min, Geom::Point const &max, Geom::Rect const &obj_rect, bool apply_x, bool apply_y);
+    Glib::ustring _getBestTarget();
+    void _setClipboardTargets();
+    void _setClipboardColor(guint32);
+    void _userWarn(SPDesktop *, char const *);
+
+    // private properties
+    std::unique_ptr<SPDocument> _clipboardSPDoc; ///< Document that stores the clipboard until someone requests it
+    Inkscape::XML::Node *_defs; ///< Reference to the clipboard document's defs node
+    Inkscape::XML::Node *_root; ///< Reference to the clipboard's root node
+    Inkscape::XML::Node *_clipnode; ///< The node that holds extra information
+    Inkscape::XML::Document *_doc; ///< Reference to the clipboard's Inkscape::XML::Document
+    std::set<SPItem*> cloned_elements;
+    std::vector<SPCSSAttr*> te_selected_style;
+    std::vector<unsigned> te_selected_style_positions;
+    int nr_blocks = 0;
+
+
+    // we need a way to copy plain text AND remember its style;
+    // the standard _clipnode is only available in an SVG tree, hence this special storage
+    SPCSSAttr *_text_style; ///< Style copied along with plain text fragment
+
+    Glib::RefPtr<Gtk::Clipboard> _clipboard; ///< Handle to the system wide clipboard - for convenience
+    std::list<Glib::ustring> _preferred_targets; ///< List of supported clipboard targets
+};
+
+
+ClipboardManagerImpl::ClipboardManagerImpl()
+    : _clipboardSPDoc(nullptr),
+      _defs(nullptr),
+      _root(nullptr),
+      _clipnode(nullptr),
+      _doc(nullptr),
+      _text_style(nullptr),
+      _clipboard( Gtk::Clipboard::get() )
+{
+    // Clipboard Formats: http://msdn.microsoft.com/en-us/library/ms649013(VS.85).aspx
+    // On Windows, most graphical applications can handle CF_DIB/CF_BITMAP and/or CF_ENHMETAFILE
+    // GTK automatically presents an "image/bmp" target as CF_DIB/CF_BITMAP
+    // Presenting "image/x-emf" as CF_ENHMETAFILE must be done by Inkscape ?
+
+    // push supported clipboard targets, in order of preference
+    _preferred_targets.emplace_back("image/x-inkscape-svg");
+    _preferred_targets.emplace_back("image/svg+xml");
+    _preferred_targets.emplace_back("image/svg+xml-compressed");
+    _preferred_targets.emplace_back("image/x-emf");
+    _preferred_targets.emplace_back("CF_ENHMETAFILE");
+    _preferred_targets.emplace_back("WCF_ENHMETAFILE"); // seen on Wine
+    _preferred_targets.emplace_back("application/pdf");
+    _preferred_targets.emplace_back("image/x-adobe-illustrator");
+
+    // Clipboard requests on app termination can cause undesired extension
+    // popup windows. Clearing the clipboard can prevent this.
+    auto application = Gio::Application::get_default();
+    if (application) {
+        application->signal_shutdown().connect_notify([this]() { this->_discardInternalClipboard(); });
+    }
+}
+
+
+ClipboardManagerImpl::~ClipboardManagerImpl() = default;
+
+
+/**
+ * Copy selection contents to the clipboard.
+ */
+void ClipboardManagerImpl::copy(ObjectSet *set)
+{
+    if ( set->desktop() ) {
+        SPDesktop *desktop = set->desktop();
+
+        // Special case for when the gradient dragger is active - copies gradient color
+        if (desktop->event_context->get_drag()) {
+            GrDrag *drag = desktop->event_context->get_drag();
+            if (drag->hasSelection()) {
+                guint32 col = drag->getColor();
+
+                // set the color as clipboard content (text in RRGGBBAA format)
+                _setClipboardColor(col);
+
+                // create a style with this color on fill and opacity in master opacity, so it can be
+                // pasted on other stops or objects
+                if (_text_style) {
+                    sp_repr_css_attr_unref(_text_style);
+                    _text_style = nullptr;
+                }
+                _text_style = sp_repr_css_attr_new();
+                // print and set properties
+                gchar color_str[16];
+                g_snprintf(color_str, 16, "#%06x", col >> 8);
+                sp_repr_css_set_property(_text_style, "fill", color_str);
+                float opacity = SP_RGBA32_A_F(col);
+                if (opacity > 1.0) {
+                    opacity = 1.0; // safeguard
+                }
+                Inkscape::CSSOStringStream opcss;
+                opcss << opacity;
+                sp_repr_css_set_property(_text_style, "opacity", opcss.str().data());
+
+                _discardInternalClipboard();
+                return;
+            }
+        }
+
+        // Special case for when the color picker ("dropper") is active - copies color under cursor
+        auto dt = dynamic_cast<Inkscape::UI::Tools::DropperTool *>(desktop->event_context);
+        if (dt) {
+            _setClipboardColor(SP_DROPPER_CONTEXT(desktop->event_context)->get_color(false, true));
+            _discardInternalClipboard();
+            return;
+        }
+
+        // Special case for when the text tool is active - if some text is selected, copy plain text,
+        // not the object that holds it; also copy the style at cursor into
+        auto tt = dynamic_cast<Inkscape::UI::Tools::TextTool *>(desktop->event_context);
+        if (tt) {
+            _discardInternalClipboard();
+            Glib::ustring selected_text = Inkscape::UI::Tools::sp_text_get_selected_text(desktop->event_context);
+            _clipboard->set_text(selected_text);
+            if (_text_style) {
+                sp_repr_css_attr_unref(_text_style);
+                _text_style = nullptr;
+            }
+            _text_style = Inkscape::UI::Tools::sp_text_get_style_at_cursor(desktop->event_context);
+            return;
+        }
+
+        // Special case for copying part of a path instead of the whole selected object.
+        if (_copyNodes(desktop, set)) {
+            return;
+        }
+    }
+    if (set->isEmpty()) {  // check whether something is selected
+        _userWarn(set->desktop(), _("Nothing was copied."));
+        return;
+    }
+    _discardInternalClipboard();
+
+    _createInternalClipboard();   // construct a new clipboard document
+    _copySelection(set);   // copy all items in the selection to the internal clipboard
+    fit_canvas_to_drawing(_clipboardSPDoc.get());
+
+    _setClipboardTargets();
+}
+
+
+/**
+ * Copy a Live Path Effect path parameter to the clipboard.
+ * @param pp The path parameter to store in the clipboard.
+ */
+void ClipboardManagerImpl::copyPathParameter(Inkscape::LivePathEffect::PathParam *pp)
+{
+    if ( pp == nullptr ) {
+        return;
+    }
+    SPItem * item = SP_ACTIVE_DESKTOP->getSelection()->singleItem();
+    Geom::PathVector pv = pp->get_pathvector();
+    if (item != nullptr) {
+        pv *= item->i2doc_affine();
+    }
+    auto svgd = sp_svg_write_path(pv);
+
+    if (svgd.empty()) {
+        return;
+    }
+
+    _discardInternalClipboard();
+    _createInternalClipboard();
+
+    Inkscape::XML::Node *pathnode = _doc->createElement("svg:path");
+    pathnode->setAttribute("d", svgd);
+    _root->appendChild(pathnode);
+    Inkscape::GC::release(pathnode);
+
+    fit_canvas_to_drawing(_clipboardSPDoc.get());
+    _setClipboardTargets();
+}
+
+/**
+ * Copy a symbol from the symbol dialog.
+ * @param symbol The Inkscape::XML::Node for the symbol.
+ */
+void ClipboardManagerImpl::copySymbol(Inkscape::XML::Node* symbol, gchar const* style, SPDocument *source)
+{
+    if (!symbol)
+        return;
+
+    _discardInternalClipboard();
+    _createInternalClipboard();
+
+    // We add "_duplicate" to have a well defined symbol name that
+    // bypasses the "prevent_id_classes" routine. We'll get rid of it
+    // when we paste.
+    Inkscape::XML::Node *repr = symbol->duplicate(_doc);
+    Glib::ustring symbol_name = repr->attribute("id");
+
+    symbol_name += "_inkscape_duplicate";
+    repr->setAttribute("id", symbol_name);
+    _defs->appendChild(repr);
+
+    auto scale = _clipboardSPDoc->getDocumentScale();
+    if (auto group = dynamic_cast<SPGroup *>(_clipboardSPDoc->getObjectByRepr(repr))) {
+        // Convert scale from source to clipboard user units
+        group->scaleChildItemsRec(scale, Geom::Point(0, 0), false);
+    }
+
+    auto href = Glib::ustring("#") + symbol->attribute("id");
+    Inkscape::XML::Node *use_repr = _doc->createElement("svg:use");
+    use_repr->setAttribute("xlink:href", href);
+
+    /**
+     * If the symbol has a viewBox but no width or height, then take width and
+     * height from the viewBox and set them on the use element. Otherwise, the
+     * use element will have 100% document width and height!
+     */
+    {
+        auto widthAttr = symbol->attribute("width");
+        auto heightAttr = symbol->attribute("height");
+        auto viewBoxAttr = symbol->attribute("viewBox");
+
+        if (viewBoxAttr && !(heightAttr || widthAttr)) {
+            SPViewBox vb;
+            vb.set_viewBox(viewBoxAttr);
+            if (vb.viewBox_set) {
+                use_repr->setAttributeSvgDouble("width", vb.viewBox.width());
+                use_repr->setAttributeSvgDouble("height", vb.viewBox.height());
+            }
+        }
+    }
+
+    // Set a default style in <use> rather than <symbol> so it can be changed.
+    use_repr->setAttribute("style", style);
+    _root->appendChild(use_repr);
+
+    if (auto use = dynamic_cast<SPUse *>(_clipboardSPDoc->getObjectByRepr(use_repr))) {
+        Geom::Affine affine = source->getDocumentScale();
+        use->doWriteTransform(affine, &affine, false);
+    }
+
+    // This min and max sets offsets, we don't have any so set to zero.
+    _clipnode->setAttributePoint("min", Geom::Point(0, 0));
+    _clipnode->setAttributePoint("max", Geom::Point(0, 0));
+
+    fit_canvas_to_drawing(_clipboardSPDoc.get());
+    _setClipboardTargets();
+}
+
+/**
+ * Paste from the system clipboard into the active desktop.
+ * @param in_place Whether to put the contents where they were when copied.
+ */
+bool ClipboardManagerImpl::paste(SPDesktop *desktop, bool in_place)
+{
+    // do any checking whether we really are able to paste before requesting the contents
+    if ( desktop == nullptr ) {
+        return false;
+    }
+    if ( Inkscape::have_viable_layer(desktop, desktop->getMessageStack()) == false ) {
+        return false;
+    }
+    
+    Glib::ustring target = _getBestTarget();
+
+    // Special cases of clipboard content handling go here
+    // Note that target priority is determined in _getBestTarget.
+    // TODO: Handle x-special/gnome-copied-files and text/uri-list to support pasting files
+
+    // if there is an image on the clipboard, paste it
+    if ( target == CLIPBOARD_GDK_PIXBUF_TARGET ) {
+        return _pasteImage(desktop->doc());
+    }
+    if (target == CLIPBOARD_TEXT_TARGET ) {
+        // It was text, and we did paste it. If not, continue on.
+        if (_pasteText(desktop)) {
+            return true;
+        }
+        // If the clipboard contains text/plain, but is an svg document
+        // then we'll try and detect it and then paste it if possible.
+    }
+
+    auto tempdoc = _retrieveClipboard(target);
+
+    if ( tempdoc == nullptr ) {
+        if (target == CLIPBOARD_TEXT_TARGET ) {
+            _userWarn(desktop, _("Can't paste text outside of the text tool."));
+            return false;
+        } else {
+            _userWarn(desktop, _("Nothing on the clipboard."));
+            return false;
+        }
+    }
+
+    if (_pasteNodes(desktop, tempdoc.get(), in_place)) {
+        return true;
+    }
+
+    // copy definitions
+    prevent_id_clashes(tempdoc.get(), desktop->getDocument(), true);
+    sp_import_document(desktop, tempdoc.get(), in_place);
+    // _copySelection() has put all items in groups, now ungroup them (preserves transform
+    // relationships of clones, text-on-path, etc.)
+    if (target == "image/x-inkscape-svg") {
+        desktop->selection->ungroup(true);
+        std::vector<SPItem *> vec2(desktop->selection->items().begin(), desktop->selection->items().end());
+        for (auto item : vec2) {
+            // just a bit beauty on paste hidden items unselect
+            if (vec2.size() > 1 && item->isHidden()) {
+                desktop->selection->remove(item);
+            }
+            SPLPEItem *pasted_lpe_item = dynamic_cast<SPLPEItem *>(item);
+            if (pasted_lpe_item) {
+                remove_hidder_filter(pasted_lpe_item);
+            }
+        }
+    }
+
+    return true;
+}
+
+/**
+ * Copy any selected nodes and return true if there were nodes.
+ */
+bool ClipboardManagerImpl::_copyNodes(SPDesktop *desktop, ObjectSet *set)
+{
+    auto node_tool = dynamic_cast<Inkscape::UI::Tools::NodeTool *>(desktop->event_context);
+    if (!node_tool || !node_tool->_selected_nodes)
+        return false;
+
+    SPObject *first_path = nullptr;
+    for (auto obj : set->items()) {
+        if(SP_IS_PATH(obj)) {
+            first_path = obj;
+            break;
+        }
+    }
+
+    auto builder = new Geom::PathBuilder();
+    node_tool->_multipath->copySelectedPath(builder);
+    Geom::PathVector pathv = builder->peek();
+
+    // discardInternalClipboard done after copy, as deleting clipboard
+    // document may trigger tool switch (as in PathParam::~PathParam)
+    _discardInternalClipboard();
+    _createInternalClipboard();
+
+    // Were any nodes actually copied?
+    if (pathv.empty() || !first_path)
+        return false;
+
+    Inkscape::XML::Node *pathRepr = _doc->createElement("svg:path");
+
+    // Remove the source document's scale from path as clipboard is 1:1
+    auto source_scale = first_path->document->getDocumentScale();
+    pathRepr->setAttribute("d", sp_svg_write_path(pathv * source_scale.inverse()));
+
+    // Group the path to make it consistant with other copy processes
+    auto group = _doc->createElement("svg:g");
+    _root->appendChild(group);
+    Inkscape::GC::release(group);
+
+    // Store the style for paste-as-object operations. Ignored if pasting into an other path.
+    pathRepr->setAttribute("style", first_path->style->write(SP_STYLE_FLAG_IFSET) );
+    group->appendChild(pathRepr);
+    Inkscape::GC::release(pathRepr);
+
+    // Store the parent transformation, and scaling factor of the copied object
+    if (auto parent = dynamic_cast<SPItem *>(first_path->parent)) {
+          auto transform_str = sp_svg_transform_write(parent->i2doc_affine());
+          group->setAttributeOrRemoveIfEmpty("transform", transform_str);
+    }
+
+    // Set the translation for paste-in-place operation, must be done after repr appends
+    if (auto path_obj = dynamic_cast<SPPath *>(_clipboardSPDoc->getObjectByRepr(pathRepr))) {
+        // we could use pathv.boundsFast here, but that box doesn't include stroke width
+        // so we must take the value from the visualBox of the new shape instead.
+        auto bbox = *(path_obj->visualBounds()) * source_scale;
+        _clipnode->setAttributePoint("min", bbox.min());
+        _clipnode->setAttributePoint("max", bbox.max());
+    }
+    _setClipboardTargets();
+    return true;
+}
+
+/**
+ * Paste nodes into a selected path and return true if it's possible.
+ *   if the node tool selected
+ *   and one path selected in target
+ *   and one path in source
+ */
+bool ClipboardManagerImpl::_pasteNodes(SPDesktop *desktop, SPDocument *clipdoc, bool in_place)
+{
+    auto node_tool = dynamic_cast<Inkscape::UI::Tools::NodeTool *>(desktop->event_context);
+    if (!node_tool || desktop->selection->objects().size() != 1)
+        return false;
+
+    SPObject *obj = desktop->selection->objects().back();
+    auto target_path = dynamic_cast<SPPath *>(obj);
+    if (!target_path)
+        return false;
+
+    auto source_scale = clipdoc->getDocumentScale();
+    auto target_trans = target_path->i2doc_affine();
+    // Select all nodes prior to pasting in, for later inversion.
+    node_tool->_selected_nodes->selectAll();
+
+    for (auto node = clipdoc->getReprRoot()->firstChild(); node ;node = node->next()) {
+
+        auto source_obj = clipdoc->getObjectByRepr(node);
+        auto group_affine = Geom::Affine();
+
+        // Unpack group that may have a transformation inside it.
+        if (auto source_group = dynamic_cast<SPGroup *>(source_obj)) {
+            if (source_group->children.size() == 1) {
+                source_obj = source_group->firstChild();
+                group_affine = source_group->i2doc_affine();
+            }
+        }
+
+        if (auto source_path = dynamic_cast<SPPath *>(source_obj)) {
+            auto source_curve = SPCurve::copy(source_path->curveForEdit());
+            auto target_curve = SPCurve::copy(target_path->curveForEdit());
+
+            // Apply group transformation which is usually the old translation plus document scaling factor
+            source_curve->transform(group_affine);
+            // Convert curve from source units (usually px so 1:1)
+            source_curve->transform(source_scale);
+
+            if (!in_place) {
+                // Move the source curve to the mouse pointer, units are px so do before target_trans
+                auto bbox = *(source_path->geometricBounds()) * group_affine;
+                auto to_mouse = Geom::Translate(desktop->point() - bbox.midpoint());
+                source_curve->transform(to_mouse);
+            } else if (auto clipnode = sp_repr_lookup_name(clipdoc->getReprRoot(), "inkscape:clipboard", 1)) {
+                // Force translation so a foreign path will end up in the right place.
+                auto bbox = *(source_path->visualBounds()) * group_affine;
+                auto to_origin = Geom::Translate(clipnode->getAttributePoint("min") - bbox.min());
+                source_curve->transform(to_origin);
+            }
+
+            // Finally convert the curve into path item's coordinate system
+            source_curve->transform(target_trans.inverse());
+
+            // Add the source curve to the target copy
+            target_curve->append(*source_curve);
+
+            // Set the attribute to keep the document up to date (fixes undo)
+            auto str = sp_svg_write_path(target_curve->get_pathvector());
+            target_path->setAttribute("d", str);
+        }
+    }
+    // Finally we invert the selection, this selects all newly added nodes.
+    node_tool->_selected_nodes->invertSelection();
+    return true;
+}
+
+/**
+ * Returns the id of the first visible copied object.
+ */
+Glib::ustring ClipboardManagerImpl::getFirstObjectID()
+{
+    auto tempdoc = _retrieveClipboard("image/x-inkscape-svg");
+    if ( tempdoc == nullptr ) {
+        return {};
+    }
+
+    Inkscape::XML::Node *root = tempdoc->getReprRoot();
+
+    if (!root) {
+        return {};
+    }
+
+    Inkscape::XML::Node *ch = root->firstChild();
+    Inkscape::XML::Node *child = nullptr;
+    // now clipboard is wrapped on copy since 202d57ea fix
+    while (ch != nullptr &&
+           g_strcmp0(ch->name(), "svg:g") &&
+           g_strcmp0(child?child->name():nullptr, "svg:g") &&
+           g_strcmp0(child?child->name():nullptr, "svg:path") &&
+           g_strcmp0(child?child->name():nullptr, "svg:use") &&
+           g_strcmp0(child?child->name():nullptr, "svg:text") &&
+           g_strcmp0(child?child->name():nullptr, "svg:image") &&
+           g_strcmp0(child?child->name():nullptr, "svg:rect") &&
+           g_strcmp0(child?child->name():nullptr, "svg:ellipse") &&
+           g_strcmp0(child?child->name():nullptr, "svg:circle")
+        ) {
+        ch = ch->next();
+        child = ch ? ch->firstChild(): nullptr;
+    }
+
+    if (child) {
+        char const *id = child->attribute("id");
+        if (id) {
+            return id;
+        }
+    }
+
+    return {};
+}
+
+/**
+ * Remove certain css elements which are not useful for pasteStyle
+ */
+void ClipboardManagerImpl::_cleanStyle(SPCSSAttr *style)
+{
+    if (style) {
+        /* Clean text 'position' properties */
+        sp_repr_css_unset_property(style, "text-anchor");
+        sp_repr_css_unset_property(style, "shape-inside");
+        sp_repr_css_unset_property(style, "shape-subtract");
+        sp_repr_css_unset_property(style, "shape-padding");
+        sp_repr_css_unset_property(style, "shape-margin");
+        sp_repr_css_unset_property(style, "inline-size");
+    }
+}
+
+/**
+ * Implements the Paste Style action.
+ */
+bool ClipboardManagerImpl::pasteStyle(ObjectSet *set)
+{
+    if (set->desktop() == nullptr) {
+        return false;
+    }
+
+    // check whether something is selected
+    if (set->isEmpty()) {
+        _userWarn(set->desktop(), _("Select <b>object(s)</b> to paste style to."));
+        return false;
+    }
+
+    auto tempdoc = _retrieveClipboard("image/x-inkscape-svg");
+    if ( tempdoc == nullptr ) {
+        // no document, but we can try _text_style
+        if (_text_style) {
+            _cleanStyle(_text_style);
+            sp_desktop_set_style(set, set->desktop(), _text_style);
+            return true;
+        } else {
+            _userWarn(set->desktop(), _("No style on the clipboard."));
+            return false;
+        }
+    }
+
+    Inkscape::XML::Node *root = tempdoc->getReprRoot();
+    Inkscape::XML::Node *clipnode = sp_repr_lookup_name(root, "inkscape:clipboard", 1);
+
+    bool pasted = false;
+
+    if (clipnode) {
+        set->document()->importDefs(tempdoc.get());
+        SPCSSAttr *style = sp_repr_css_attr(clipnode, "style");
+        sp_desktop_set_style(set, set->desktop(), style);
+        pasted = true;
+    }
+    else {
+        _userWarn(set->desktop(), _("No style on the clipboard."));
+    }
+
+    return pasted;
+}
+
+
+/**
+ * Resize the selection or each object in the selection to match the clipboard's size.
+ * @param separately Whether to scale each object in the selection separately
+ * @param apply_x Whether to scale the width of objects / selection
+ * @param apply_y Whether to scale the height of objects / selection
+ */
+bool ClipboardManagerImpl::pasteSize(ObjectSet *set, bool separately, bool apply_x, bool apply_y)
+{
+    if (!apply_x && !apply_y) {
+        return false; // pointless parameters
+    }
+
+/*    if ( desktop == NULL ) {
+        return false;
+    }
+    Inkscape::Selection *selection = desktop->getSelection();*/
+    if (set->isEmpty()) {
+        if(set->desktop())
+            _userWarn(set->desktop(), _("Select <b>object(s)</b> to paste size to."));
+        return false;
+    }
+
+    // FIXME: actually, this should accept arbitrary documents
+    auto tempdoc = _retrieveClipboard("image/x-inkscape-svg");
+    if ( tempdoc == nullptr ) {
+        if(set->desktop())
+            _userWarn(set->desktop(), _("No size on the clipboard."));
+        return false;
+    }
+
+    // retrieve size information from the clipboard
+    Inkscape::XML::Node *root = tempdoc->getReprRoot();
+    Inkscape::XML::Node *clipnode = sp_repr_lookup_name(root, "inkscape:clipboard", 1);
+    bool pasted = false;
+    if (clipnode) {
+        Geom::Point min, max;
+        bool visual_bbox = !Inkscape::Preferences::get()->getInt("/tools/bounding_box");
+        min = clipnode->getAttributePoint((visual_bbox ? "min" : "geom-min"), min);
+        max = clipnode->getAttributePoint((visual_bbox ? "max" : "geom-max"), max);
+
+        // resize each object in the selection
+        if (separately) {
+            auto itemlist= set->items();
+            for(auto i=itemlist.begin();i!=itemlist.end();++i){
+                SPItem *item = *i;
+                if (item) {
+                    Geom::OptRect obj_size = item->desktopPreferredBounds();
+                    if ( obj_size ) {
+                        item->scale_rel(_getScale(set->desktop(), min, max, *obj_size, apply_x, apply_y));
+                    }
+                } else {
+                    g_assert_not_reached();
+                }
+            }
+        }
+        // resize the selection as a whole
+        else {
+            Geom::OptRect sel_size = set->preferredBounds();
+            if ( sel_size ) {
+                set->setScaleRelative(sel_size->midpoint(),
+                                             _getScale(set->desktop(), min, max, *sel_size, apply_x, apply_y));
+            }
+        }
+        pasted = true;
+    }
+    return pasted;
+}
+
+
+/**
+ * Applies a path effect from the clipboard to the selected path.
+ */
+bool ClipboardManagerImpl::pastePathEffect(ObjectSet *set)
+{
+    /** @todo FIXME: pastePathEffect crashes when moving the path with the applied effect,
+        segfaulting in fork_private_if_necessary(). */
+
+    if ( set->desktop() == nullptr ) {
+        return false;
+    }
+
+    //Inkscape::Selection *selection = desktop->getSelection();
+    if (!set || set->isEmpty()) {
+        _userWarn(set->desktop(), _("Select <b>object(s)</b> to paste live path effect to."));
+        return false;
+    }
+
+    auto tempdoc = _retrieveClipboard("image/x-inkscape-svg");
+    if ( tempdoc ) {
+        Inkscape::XML::Node *root = tempdoc->getReprRoot();
+        Inkscape::XML::Node *clipnode = sp_repr_lookup_name(root, "inkscape:clipboard", 1);
+        if ( clipnode ) {
+            gchar const *effectstack = clipnode->attribute("inkscape:path-effect");
+            if ( effectstack ) {
+                set->document()->importDefs(tempdoc.get());
+                // make sure all selected items are converted to paths first (i.e. rectangles)
+                set->toLPEItems();
+                auto itemlist= set->items();
+                for(auto i=itemlist.begin();i!=itemlist.end();++i){
+                    SPItem *item = *i;
+                    _applyPathEffect(item, effectstack);
+                    item->doWriteTransform(item->transform);
+                }
+
+                return true;
+            }
+        }
+    }
+
+    // no_effect:
+    _userWarn(set->desktop(), _("No effect on the clipboard."));
+    return false;
+}
+
+
+/**
+ * Get LPE path data from the clipboard.
+ * @return The retrieved path data (contents of the d attribute), or "" if no path was found
+ */
+Glib::ustring ClipboardManagerImpl::getPathParameter(SPDesktop* desktop)
+{
+    auto doc = _retrieveClipboard(); // any target will do here
+    if (!doc) {
+        _userWarn(desktop, _("Nothing on the clipboard."));
+        return "";
+    }
+
+    // unlimited search depth
+    auto repr = sp_repr_lookup_name(doc->getReprRoot(), "svg:path", -1);
+    SPItem *item = dynamic_cast<SPItem *>(doc->getObjectByRepr(repr));
+
+    if (!item) {
+        _userWarn(desktop, _("Clipboard does not contain a path."));
+        return "";
+    }
+
+    // Adjust any copied path into the target document transform.
+    auto tr_p = item->i2doc_affine();
+    auto tr_s = doc->getDocumentScale().inverse();
+    auto pathv = sp_svg_read_pathv(repr->attribute("d"));
+    return sp_svg_write_path(pathv * tr_s * tr_p);
+}
+
+
+/**
+ * Get object id of a shape or text item from the clipboard.
+ * @return The retrieved id string (contents of the id attribute), or "" if no shape or text item was found.
+ */
+Glib::ustring ClipboardManagerImpl::getShapeOrTextObjectId(SPDesktop *desktop)
+{
+    // https://bugs.launchpad.net/inkscape/+bug/1293979
+    // basically, when we do a depth-first search, we're stopping
+    // at the first object to be <svg:path> or <svg:text>.
+    // but that could then return the id of the object's
+    // clip path or mask, not the original path!
+
+    auto tempdoc = _retrieveClipboard(); // any target will do here
+    if ( tempdoc == nullptr ) {
+        _userWarn(desktop, _("Nothing on the clipboard."));
+        return "";
+    }
+    Inkscape::XML::Node *root = tempdoc->getReprRoot();
+
+    // 1293979: strip out the defs of the document
+    root->removeChild(tempdoc->getDefs()->getRepr());
+
+    Inkscape::XML::Node *repr = sp_repr_lookup_name(root, "svg:path", -1); // unlimited search depth
+    if ( repr == nullptr ) {
+        repr = sp_repr_lookup_name(root, "svg:text", -1);
+    }
+    if (repr == nullptr) {
+        repr = sp_repr_lookup_name(root, "svg:ellipse", -1);
+    }
+    if (repr == nullptr) {
+        repr = sp_repr_lookup_name(root, "svg:rect", -1);
+    }
+    if (repr == nullptr) {
+        repr = sp_repr_lookup_name(root, "svg:circle", -1);
+    }
+
+
+    if ( repr == nullptr ) {
+        _userWarn(desktop, _("Clipboard does not contain a path."));
+        return "";
+    }
+    gchar const *svgd = repr->attribute("id");
+    return svgd ? svgd : "";
+}
+
+/**
+ * Get all objects id  from the clipboard.
+ * @return A vector containing all IDs or empty if no shape or text item was found.
+ * type. Set to "*" to retrieve all elements of the types vector inside, feel free to populate more
+ */
+std::vector<Glib::ustring> ClipboardManagerImpl::getElementsOfType(SPDesktop *desktop, gchar const* type, gint maxdepth)
+{
+    std::vector<Glib::ustring> result;
+    auto tempdoc = _retrieveClipboard(); // any target will do here
+    if ( tempdoc == nullptr ) {
+        _userWarn(desktop, _("Nothing on the clipboard."));
+        return result;
+    }
+    Inkscape::XML::Node *root = tempdoc->getReprRoot();
+
+    // 1293979: strip out the defs of the document
+    root->removeChild(tempdoc->getDefs()->getRepr());
+    std::vector<Inkscape::XML::Node const *> reprs;
+    if (strcmp(type, "*") == 0){
+        //TODO:Fill vector with all possible elements
+        std::vector<Glib::ustring> types;
+        types.push_back((Glib::ustring)"svg:path");
+        types.push_back((Glib::ustring)"svg:circle");
+        types.push_back((Glib::ustring)"svg:rect");
+        types.push_back((Glib::ustring)"svg:ellipse");
+        types.push_back((Glib::ustring)"svg:text");
+        types.push_back((Glib::ustring)"svg:use");
+        types.push_back((Glib::ustring)"svg:g");
+        types.push_back((Glib::ustring)"svg:image");
+        for (auto type_elem : types) {
+            std::vector<Inkscape::XML::Node const *> reprs_found = sp_repr_lookup_name_many(root, type_elem.c_str(), maxdepth); // unlimited search depth
+            reprs.insert(reprs.end(), reprs_found.begin(), reprs_found.end());
+        }
+    } else {
+        reprs = sp_repr_lookup_name_many(root, type, maxdepth);
+    }
+    for (auto node : reprs) {
+        result.emplace_back(node->attribute("id"));
+    }
+    if ( result.empty() ) {
+        _userWarn(desktop, (Glib::ustring::compose(_("Clipboard does not contain any objects of type \"%1\"."), type)).c_str());
+        return result;
+    }
+    return result;
+}
+
+/**
+ * Iterate over a list of items and copy them to the clipboard.
+ */
+void ClipboardManagerImpl::_copySelection(ObjectSet *selection)
+{
+    // copy the defs used by all items
+    auto itemlist= selection->items();
+    cloned_elements.clear();
+    std::vector<SPItem *> items(itemlist.begin(), itemlist.end());
+    for (auto item : itemlist) {
+        SPLPEItem *lpeitem = dynamic_cast<SPLPEItem *>(item);
+        if (lpeitem) {
+            for (auto satellite : lpeitem->get_satellites(false, true)) {
+                if (satellite) {
+                    SPItem *item2 = dynamic_cast<SPItem *>(satellite);
+                    if (item2 && std::find(items.begin(), items.end(), item2) == items.end()) {
+                        items.push_back(item2);
+                    }
+                }
+            }
+        }
+    }
+    cloned_elements.clear();
+    for (auto item : items) {
+        if (item) {
+            _copyUsedDefs(item);
+        } else {
+            g_assert_not_reached();
+        }
+    }
+
+    // copy the representation of the items
+    std::vector<SPObject *> sorted_items(items.begin(), items.end());
+    {
+        // Get external text references and add them to sorted_items
+        auto ext_refs = text_categorize_refs(selection->document(),
+                sorted_items.begin(), sorted_items.end(),
+                TEXT_REF_EXTERNAL);
+        for (auto const &ext_ref : ext_refs) {
+            sorted_items.push_back(selection->document()->getObjectById(ext_ref.first));
+        }
+    }
+    sort(sorted_items.begin(), sorted_items.end(), sp_object_compare_position_bool);
+
+    //remove already copied elements from cloned_elements
+    std::vector<SPItem*>tr;
+    for(auto cloned_element : cloned_elements){
+        if(std::find(sorted_items.begin(),sorted_items.end(),cloned_element)!=sorted_items.end())
+            tr.push_back(cloned_element);
+    }
+    for(auto & it : tr){
+        cloned_elements.erase(it);
+    }
+
+    // One group per shared parent
+    std::map<SPObject const *, Inkscape::XML::Node *> groups;
+
+    sorted_items.insert(sorted_items.end(),cloned_elements.begin(),cloned_elements.end());
+    for(auto sorted_item : sorted_items){
+        SPItem *item = dynamic_cast<SPItem*>(sorted_item);
+        if (item) {
+            // Create a group with the parent transform. This group will be ungrouped when pasting
+            // und takes care of transform relationships of clones, text-on-path, etc.
+            auto &group = groups[item->parent];
+            if (!group) {
+                group = _doc->createElement("svg:g");
+                _root->appendChild(group);
+                Inkscape::GC::release(group);
+
+                if (auto parent = dynamic_cast<SPItem *>(item->parent)) {
+                    auto transform_str = sp_svg_transform_write(parent->i2doc_affine());
+                    group->setAttributeOrRemoveIfEmpty("transform", transform_str);
+                }
+            }
+
+            Inkscape::XML::Node *obj = item->getRepr();
+            Inkscape::XML::Node *obj_copy;
+            if(cloned_elements.find(item)==cloned_elements.end())
+                obj_copy = _copyNode(obj, _doc, group);
+            else
+                obj_copy = _copyNode(obj, _doc, _clipnode);
+
+            // copy complete inherited style
+            _copyCompleteStyle(item, obj_copy);
+        }
+    }
+    // copy style for Paste Style action
+    if (auto item = selection->singleItem()) {
+        SPCSSAttr *style = take_style_from_item(item);
+        _cleanStyle(style);
+        sp_repr_css_set(_clipnode, style, "style");
+        sp_repr_css_attr_unref(style);
+
+        // copy path effect from the first path
+        if (gchar const *effect = item->getRepr()->attribute("inkscape:path-effect")) {
+            _clipnode->setAttribute("inkscape:path-effect", effect);
+        }
+    }
+
+    if (Geom::OptRect size = selection->visualBounds()) {
+        _clipnode->setAttributePoint("min", size->min());
+        _clipnode->setAttributePoint("max", size->max());
+    }
+    if (Geom::OptRect geom_size = selection->geometricBounds()) {
+        _clipnode->setAttributePoint("geom-min", geom_size->min());
+        _clipnode->setAttributePoint("geom-max", geom_size->max());
+    }
+}
+
+/**
+ * Copies the style from the stylesheet to preserve it.
+ *
+ * @param item - The source item (connected to it's document)
+ * @param target - The target xml node to store the style in.
+ * @param child - Flag to indicate a recursive call, do not use.
+ */
+void ClipboardManagerImpl::_copyCompleteStyle(SPItem *item, Inkscape::XML::Node *target, bool child)
+{
+    auto source = item->getRepr();
+    SPCSSAttr *css;
+    if (child) {
+        // Child styles shouldn't copy their parent's existing cascaded style.
+        css = sp_repr_css_attr(source, "style");
+    } else {
+        css = sp_repr_css_attr_inherited(source, "style");
+    }
+    for (auto iter : item->style->properties()) {
+        if (iter->style_src == SPStyleSrc::STYLE_SHEET) {
+            css->setAttributeOrRemoveIfEmpty(iter->name(), iter->get_value());
+        }
+    }
+    sp_repr_css_set(target, css, "style");
+    sp_repr_css_attr_unref(css);
+
+    if (dynamic_cast<SPGroup *>(item)) {
+        // Recursively go through chldren too
+        auto source_child = source->firstChild();
+        auto target_child = target->firstChild();
+        while (source_child && target_child) {
+            if (auto child_item = dynamic_cast<SPItem *>(item->document->getObjectByRepr(source_child))) {
+                _copyCompleteStyle(child_item, target_child, true);
+            }
+            source_child = source_child->next();
+            target_child = target_child->next();
+        }
+    }
+}
+
+/**
+ * Recursively copy all the definitions used by a given item to the clipboard defs.
+ */
+void ClipboardManagerImpl::_copyUsedDefs(SPItem *item)
+{
+    SPUse *use=dynamic_cast<SPUse *>(item);
+    if (use && use->get_original()) {
+        if(cloned_elements.insert(use->get_original()).second)
+            _copyUsedDefs(use->get_original());
+    }
+
+    // copy fill and stroke styles (patterns and gradients)
+    SPStyle *style = item->style;
+
+    if (style && (style->fill.isPaintserver())) {
+        SPPaintServer *server = item->style->getFillPaintServer();
+        if ( dynamic_cast<SPLinearGradient *>(server) || dynamic_cast<SPRadialGradient *>(server) || dynamic_cast<SPMeshGradient *>(server) ) {
+            _copyGradient(dynamic_cast<SPGradient *>(server));
+        }
+        SPPattern *pattern = dynamic_cast<SPPattern *>(server);
+        if (pattern) {
+            _copyPattern(pattern);
+        }
+        SPHatch *hatch = dynamic_cast<SPHatch *>(server);
+        if (hatch) {
+            _copyHatch(hatch);
+        }
+    }
+    if (style && (style->stroke.isPaintserver())) {
+        SPPaintServer *server = item->style->getStrokePaintServer();
+        if ( dynamic_cast<SPLinearGradient *>(server) || dynamic_cast<SPRadialGradient *>(server) || dynamic_cast<SPMeshGradient *>(server) ) {
+            _copyGradient(dynamic_cast<SPGradient *>(server));
+        }
+        SPPattern *pattern = dynamic_cast<SPPattern *>(server);
+        if (pattern) {
+            _copyPattern(pattern);
+        }
+        SPHatch *hatch = dynamic_cast<SPHatch *>(server);
+        if (hatch) {
+            _copyHatch(hatch);
+        }
+    }
+
+    // For shapes, copy all of the shape's markers
+    SPShape *shape = dynamic_cast<SPShape *>(item);
+    if (shape) {
+        for (auto & i : shape->_marker) {
+            if (i) {
+                _copyNode(i->getRepr(), _doc, _defs);
+            }
+        }
+    }
+
+    // For 3D boxes, copy perspectives
+    if (SPBox3D *box = dynamic_cast<SPBox3D *>(item)) {
+        if (auto perspective = box->get_perspective()) {
+            _copyNode(perspective->getRepr(), _doc, _defs);
+        }
+    }
+
+    // Copy text paths
+    {
+        SPText *text = dynamic_cast<SPText *>(item);
+        SPTextPath *textpath = (text) ? dynamic_cast<SPTextPath *>(text->firstChild()) : nullptr;
+        if (textpath) {
+            _copyTextPath(textpath);
+        }
+        if (text) {
+            for (auto &&shape_prop_ptr : {
+                    reinterpret_cast<SPIShapes SPStyle::*>(&SPStyle::shape_inside),
+                    reinterpret_cast<SPIShapes SPStyle::*>(&SPStyle::shape_subtract) }) {
+                for (auto *href : (text->style->*shape_prop_ptr).hrefs) {
+                    auto shape_obj = href->getObject();
+                    if (!shape_obj)
+                        continue;
+                    auto shape_repr = shape_obj->getRepr();
+                    if (sp_repr_is_def(shape_repr)) {
+                        _copyIgnoreDup(shape_repr, _doc, _defs);
+                    }
+                }
+            }
+        }
+    }
+
+    // Copy clipping objects
+    if (SPObject *clip = item->getClipObject()) {
+        _copyNode(clip->getRepr(), _doc, _defs);
+    }
+    // Copy mask objects
+    if (SPObject *mask = item->getMaskObject()) {
+            _copyNode(mask->getRepr(), _doc, _defs);
+            // recurse into the mask for its gradients etc.
+            for(auto& o: mask->children) {
+                SPItem *childItem = dynamic_cast<SPItem *>(&o);
+                if (childItem) {
+                    _copyUsedDefs(childItem);
+                }
+            }
+    }
+
+    // Copy filters
+    if (style->getFilter()) {
+        SPObject *filter = style->getFilter();
+        if (dynamic_cast<SPFilter *>(filter)) {
+            _copyNode(filter->getRepr(), _doc, _defs);
+        }
+    }
+
+    // For lpe items, copy lpe stack if applicable
+    SPLPEItem *lpeitem = dynamic_cast<SPLPEItem *>(item);
+    if (lpeitem) {
+        if (lpeitem->hasPathEffect()) {
+            PathEffectList path_effect_list( *lpeitem->path_effect_list);
+            for (auto &lperef : path_effect_list) {
+                LivePathEffectObject *lpeobj = lperef->lpeobject;
+                if (lpeobj) {
+                  _copyNode(lpeobj->getRepr(), _doc, _defs);
+                }
+            }
+        }
+    }
+
+    // recurse
+    for(auto& o: item->children) {
+        SPItem *childItem = dynamic_cast<SPItem *>(&o);
+        if (childItem) {
+            _copyUsedDefs(childItem);
+        }
+    }
+}
+
+/**
+ * Copy a single gradient to the clipboard's defs element.
+ */
+void ClipboardManagerImpl::_copyGradient(SPGradient *gradient)
+{
+    while (gradient) {
+        // climb up the refs, copying each one in the chain
+        _copyNode(gradient->getRepr(), _doc, _defs);
+        if (gradient->ref){
+            gradient = gradient->ref->getObject();
+        }
+        else {
+            gradient = nullptr;
+        }
+    }
+}
+
+
+/**
+ * Copy a single pattern to the clipboard document's defs element.
+ */
+void ClipboardManagerImpl::_copyPattern(SPPattern *pattern)
+{
+    // climb up the references, copying each one in the chain
+    while (pattern) {
+        _copyNode(pattern->getRepr(), _doc, _defs);
+
+        // items in the pattern may also use gradients and other patterns, so recurse
+        for (auto& child: pattern->children) {
+            SPItem *childItem = dynamic_cast<SPItem *>(&child);
+            if (childItem) {
+                _copyUsedDefs(childItem);
+            }
+        }
+        if (pattern->ref){
+            pattern = pattern->ref->getObject();
+        }
+        else{
+            pattern = nullptr;
+        }
+    }
+}
+
+/**
+ * Copy a single hatch to the clipboard document's defs element.
+ */
+void ClipboardManagerImpl::_copyHatch(SPHatch *hatch)
+{
+    // climb up the references, copying each one in the chain
+    while (hatch) {
+        _copyNode(hatch->getRepr(), _doc, _defs);
+
+        for (auto &child : hatch->children) {
+            SPItem *childItem = dynamic_cast<SPItem *>(&child);
+            if (childItem) {
+                _copyUsedDefs(childItem);
+            }
+        }
+        if (hatch->ref) {
+            hatch = hatch->ref->getObject();
+        } else {
+            hatch = nullptr;
+        }
+    }
+}
+
+
+/**
+ * Copy a text path to the clipboard's defs element.
+ */
+void ClipboardManagerImpl::_copyTextPath(SPTextPath *tp)
+{
+    SPItem *path = sp_textpath_get_path_item(tp);
+    if (!path) {
+        return;
+    }
+    // textpaths that aren't in defs (on the canvas) shouldn't be copied because if
+    // both objects are being copied already, this ends up stealing the refs id.
+    if(path->parent && SP_IS_DEFS(path->parent)) {
+        _copyIgnoreDup(path->getRepr(), _doc, _defs);
+    }
+}
+
+
+/**
+ * Copy a single XML node from one document to another.
+ * @param node The node to be copied
+ * @param target_doc The document to which the node is to be copied
+ * @param parent The node in the target document which will become the parent of the copied node
+ * @return Pointer to the copied node
+ */
+Inkscape::XML::Node *ClipboardManagerImpl::_copyNode(Inkscape::XML::Node *node, Inkscape::XML::Document *target_doc, Inkscape::XML::Node *parent)
+{
+    Inkscape::XML::Node *dup = node->duplicate(target_doc);
+    parent->appendChild(dup);
+    Inkscape::GC::release(dup);
+    return dup;
+}
+
+Inkscape::XML::Node *ClipboardManagerImpl::_copyIgnoreDup(Inkscape::XML::Node *node, Inkscape::XML::Document *target_doc, Inkscape::XML::Node *parent)
+{
+    if (sp_repr_lookup_child(_root, "id", node->attribute("id"))) {
+        // node already copied
+        return nullptr;
+    }
+    Inkscape::XML::Node *dup = node->duplicate(target_doc);
+    parent->appendChild(dup);
+    Inkscape::GC::release(dup);
+    return dup;
+}
+
+
+/**
+ * Retrieve a bitmap image from the clipboard and paste it into the active document.
+ */
+bool ClipboardManagerImpl::_pasteImage(SPDocument *doc)
+{
+    if ( doc == nullptr ) {
+        return false;
+    }
+
+    // retrieve image data
+    Glib::RefPtr<Gdk::Pixbuf> img = _clipboard->wait_for_image();
+    if (!img) {
+        return false;
+    }
+
+    Inkscape::Extension::Extension *png = Inkscape::Extension::find_by_mime("image/png");
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    Glib::ustring attr_saved = prefs->getString("/dialogs/import/link");
+    bool ask_saved = prefs->getBool("/dialogs/import/ask");
+    prefs->setString("/dialogs/import/link", "embed");
+    prefs->setBool("/dialogs/import/ask", false);
+    png->set_gui(false);
+
+    gchar *filename = g_build_filename( g_get_user_cache_dir(), "inkscape-clipboard-import", nullptr );
+    img->save(filename, "png");
+    file_import(doc, filename, png);
+    g_free(filename);
+    prefs->setString("/dialogs/import/link", attr_saved);
+    prefs->setBool("/dialogs/import/ask", ask_saved);
+    png->set_gui(true);
+
+    return true;
+}
+
+/**
+ * Paste text into the selected text object or create a new one to hold it.
+ */
+bool ClipboardManagerImpl::_pasteText(SPDesktop *desktop)
+{
+    if ( desktop == nullptr ) {
+        return false;
+    }
+
+    // if the text editing tool is active, paste the text into the active text object
+    if (dynamic_cast<Inkscape::UI::Tools::TextTool *>(desktop->event_context)) {
+        return Inkscape::UI::Tools::sp_text_paste_inline(desktop->event_context);
+    }
+
+    // Parse the clipboard text as if it was a color string.
+    Glib::RefPtr<Gtk::Clipboard> clipboard = Gtk::Clipboard::get();
+    Glib::ustring const clip_text = clipboard->wait_for_text();
+    if (clip_text.length() < 30) {
+        // Zero makes it impossible to paste a 100% transparent black, but it's useful.
+        guint32 const rgb0 = sp_svg_read_color(clip_text.c_str(), 0x0);
+        if (rgb0) {
+            SPCSSAttr *color_css = sp_repr_css_attr_new();
+            sp_repr_css_set_property(color_css, "fill", SPColor(rgb0).toString().c_str());
+            // In the future this could parse opacity, but sp_svg_read_color lacks this.
+            sp_repr_css_set_property(color_css, "fill-opacity", "1.0");
+            sp_desktop_set_style(desktop, color_css);
+            return true;
+        }
+    }
+    return false;
+}
+
+
+/**
+ * Applies a pasted path effect to a given item.
+ */
+void ClipboardManagerImpl::_applyPathEffect(SPItem *item, gchar const *effectstack)
+{
+    if ( item == nullptr ) {
+        return;
+    }
+
+    SPLPEItem *lpeitem = dynamic_cast<SPLPEItem *>(item);
+    if (lpeitem && effectstack) {
+        std::istringstream iss(effectstack);
+        std::string href;
+        while (std::getline(iss, href, ';'))
+        {
+            SPObject *obj = sp_uri_reference_resolve(_clipboardSPDoc.get(), href.c_str());
+            if (!obj) {
+                return;
+            }
+            LivePathEffectObject *lpeobj = dynamic_cast<LivePathEffectObject *>(obj);
+            if (lpeobj) {
+                Inkscape::LivePathEffect::LPESpiro *spiroto = dynamic_cast<Inkscape::LivePathEffect::LPESpiro *>(lpeobj->get_lpe());
+                bool has_spiro = lpeitem->hasPathEffectOfType(Inkscape::LivePathEffect::SPIRO);
+                Inkscape::LivePathEffect::LPEBSpline *bsplineto = dynamic_cast<Inkscape::LivePathEffect::LPEBSpline *>(lpeobj->get_lpe());
+                bool has_bspline = lpeitem->hasPathEffectOfType(Inkscape::LivePathEffect::BSPLINE);
+                if ((!spiroto || !has_spiro) && (!bsplineto || !has_bspline)) {
+                    lpeitem->addPathEffect(lpeobj);
+                }
+            }
+        }
+        // for each effect in the stack, check if we need to fork it before adding it to the item
+        lpeitem->forkPathEffectsIfNecessary(1);
+    }
+}
+
+
+/**
+ * Retrieve the clipboard contents as a document.
+ * @return Clipboard contents converted to SPDocument, or NULL if no suitable content was present
+ */
+std::unique_ptr<SPDocument> ClipboardManagerImpl::_retrieveClipboard(Glib::ustring required_target)
+{
+    Glib::ustring best_target;
+    if ( required_target == "" ) {
+        best_target = _getBestTarget();
+    } else {
+        best_target = required_target;
+    }
+
+    if ( best_target == "" ) {
+        return nullptr;
+    }
+
+    // FIXME: Temporary hack until we add memory input.
+    // Save the clipboard contents to some file, then read it
+    gchar *filename = g_build_filename( g_get_user_cache_dir(), "inkscape-clipboard-import", nullptr );
+
+    bool file_saved = false;
+    Glib::ustring target = best_target;
+
+#ifdef _WIN32
+    if (best_target == "CF_ENHMETAFILE" || best_target == "WCF_ENHMETAFILE")
+    {   // Try to save clipboard data as en emf file (using win32 api)
+        if (OpenClipboard(NULL)) {
+            HGLOBAL hglb = GetClipboardData(CF_ENHMETAFILE);
+            if (hglb) {
+                HENHMETAFILE hemf = CopyEnhMetaFile((HENHMETAFILE) hglb, filename);
+                if (hemf) {
+                    file_saved = true;
+                    target = "image/x-emf";
+                    DeleteEnhMetaFile(hemf);
+                }
+            }
+            CloseClipboard();
+        }
+    }
+#endif
+
+    if (!file_saved) {
+        if ( !_clipboard->wait_is_target_available(best_target) ) {
+            return nullptr;
+        }
+
+        // doing this synchronously makes better sense
+        // TODO: use another method because this one is badly broken imo.
+        // from documentation: "Returns: A SelectionData object, which will be invalid if retrieving the given target failed."
+        // I don't know how to check whether an object is 'valid' or not, unusable if that's not possible...
+        Gtk::SelectionData sel = _clipboard->wait_for_contents(best_target);
+        target = sel.get_target();  // this can crash if the result was invalid of last function. No way to check for this :(
+
+        // FIXME: Temporary hack until we add memory input.
+        // Save the clipboard contents to some file, then read it
+        g_file_set_contents(filename, (const gchar *) sel.get_data(), sel.get_length(), nullptr);
+    }
+
+    // there is no specific plain SVG input extension, so if we can paste the Inkscape SVG format,
+    // we use the image/svg+xml mimetype to look up the input extension
+    if (target == "image/x-inkscape-svg" || target == "text/plain") {
+        target = "image/svg+xml";
+    }
+    // Use the EMF extension to import metafiles
+    if (target == "CF_ENHMETAFILE" || target == "WCF_ENHMETAFILE") {
+        target = "image/x-emf";
+    }
+
+    Inkscape::Extension::DB::InputList inlist;
+    Inkscape::Extension::db.get_input_list(inlist);
+    Inkscape::Extension::DB::InputList::const_iterator in = inlist.begin();
+    for (; in != inlist.end() && target != (*in)->get_mimetype() ; ++in) {
+    };
+    if ( in == inlist.end() ) {
+        return nullptr; // this shouldn't happen unless _getBestTarget returns something bogus
+    }
+
+    SPDocument *tempdoc = nullptr;
+    try {
+        tempdoc = (*in)->open(filename);
+    } catch (...) {
+    }
+    g_unlink(filename);
+    g_free(filename);
+
+    return std::unique_ptr<SPDocument>(tempdoc);
+}
+
+
+/**
+ * Callback called when some other application requests data from Inkscape.
+ *
+ * Finds a suitable output extension to save the internal clipboard document,
+ * then saves it to memory and sets the clipboard contents.
+ */
+void ClipboardManagerImpl::_onGet(Gtk::SelectionData &sel, guint /*info*/)
+{
+    if (_clipboardSPDoc == nullptr)
+        return;
+
+    Glib::ustring target = sel.get_target();
+    if (target == "") {
+        return; // this shouldn't happen
+    }
+
+    if (target == CLIPBOARD_TEXT_TARGET) {
+        target = "image/x-inkscape-svg";
+    }
+
+    // FIXME: Temporary hack until we add support for memory output.
+    // Save to a temporary file, read it back and then set the clipboard contents
+    gchar *filename = g_build_filename( g_get_user_cache_dir(), "inkscape-clipboard-export", nullptr );
+    gchar *data = nullptr;
+    gsize len;
+
+    // XXX This is a crude fix for clipboards accessing extensions
+    // Remove when gui is extracted from extension execute and uses exceptions.
+    bool previous_gui = INKSCAPE.use_gui();
+    INKSCAPE.use_gui(false);
+
+    try {
+        // TODO: In the future we may want to detect raster image types such as jpeg
+        // and use export_raster to get the right output for some programs.
+        if (target == "image/png")
+        {
+            gdouble dpi = Inkscape::Util::Quantity::convert(1, "in", "px");
+            guint32 bgcolor = 0x00000000;
+
+            Geom::Point origin (_clipboardSPDoc->getRoot()->x.computed, _clipboardSPDoc->getRoot()->y.computed);
+            Geom::Rect area = Geom::Rect(origin, origin + _clipboardSPDoc->getDimensions());
+
+            unsigned long int width = (unsigned long int) (area.width() + 0.5);
+            unsigned long int height = (unsigned long int) (area.height() + 0.5);
+
+            // read from namedview
+            Inkscape::XML::Node *nv = _clipboardSPDoc->getReprNamedView();
+            if (nv && nv->attribute("pagecolor")) {
+                bgcolor = sp_svg_read_color(nv->attribute("pagecolor"), 0xffffff00);
+            }
+            if (nv && nv->attribute("inkscape:pageopacity")) {
+                double opacity = nv->getAttributeDouble("inkscape:pageopacity", 1.0);
+                bgcolor |= SP_COLOR_F_TO_U(opacity);
+            }
+            std::vector<SPItem*> x;
+            sp_export_png_file(_clipboardSPDoc.get(), filename, area, width, height, dpi, dpi, bgcolor, nullptr,
+                               nullptr, true, x);
+        }
+        else
+        {
+            Inkscape::Extension::DB::OutputList outlist;
+            Inkscape::Extension::db.get_output_list(outlist);
+            Inkscape::Extension::DB::OutputList::const_iterator out = outlist.begin();
+            for ( ; out != outlist.end() && target != (*out)->get_mimetype() ; ++out) {
+
+            };
+            if (!(*out)->loaded()) {
+                // Need to load the extension.
+                (*out)->set_state(Inkscape::Extension::Extension::STATE_LOADED);
+            }
+
+            (*out)->save(_clipboardSPDoc.get(), filename, true);
+        }
+        g_file_get_contents(filename, &data, &len, nullptr);
+
+        sel.set(8, (guint8 const *) data, len);
+    } catch (...) {
+    }
+
+    INKSCAPE.use_gui(previous_gui);
+    g_unlink(filename); // delete the temporary file
+    g_free(filename);
+    g_free(data);
+}
+
+
+/**
+ * Callback when someone else takes the clipboard.
+ *
+ * When the clipboard owner changes, this callback clears the internal clipboard document
+ * to reduce memory usage.
+ */
+void ClipboardManagerImpl::_onClear()
+{
+    // why is this called before _onGet???
+    //_discardInternalClipboard();
+}
+
+
+/**
+ * Creates an internal clipboard document from scratch.
+ */
+void ClipboardManagerImpl::_createInternalClipboard()
+{
+    if ( _clipboardSPDoc == nullptr ) {
+        _clipboardSPDoc.reset(SPDocument::createNewDoc(nullptr, false, true));
+        //g_assert( _clipboardSPDoc != NULL );
+        _defs = _clipboardSPDoc->getDefs()->getRepr();
+        _doc = _clipboardSPDoc->getReprDoc();
+        _root = _clipboardSPDoc->getReprRoot();
+
+        // Preserve ANY copied text kerning
+        _root->setAttribute("xml:space", "preserve");
+
+        if (SP_ACTIVE_DOCUMENT) {
+            _clipboardSPDoc->setDocumentBase(SP_ACTIVE_DOCUMENT->getDocumentBase());
+        }
+
+        _clipnode = _doc->createElement("inkscape:clipboard");
+        _root->appendChild(_clipnode);
+        Inkscape::GC::release(_clipnode);
+
+        // once we create a SVG document, style will be stored in it, so flush _text_style
+        if (_text_style) {
+            sp_repr_css_attr_unref(_text_style);
+            _text_style = nullptr;
+        }
+    }
+}
+
+
+/**
+ * Deletes the internal clipboard document.
+ */
+void ClipboardManagerImpl::_discardInternalClipboard()
+{
+    if ( _clipboardSPDoc != nullptr ) {
+        // Explicit delete required to free SPDocument
+        // see https://gitlab.com/inkscape/inkscape/-/issues/2723
+        delete _clipboardSPDoc.release();
+        _defs = nullptr;
+        _doc = nullptr;
+        _root = nullptr;
+        _clipnode = nullptr;
+    }
+}
+
+
+/**
+ * Get the scale to resize an item, based on the command and desktop state.
+ */
+Geom::Scale ClipboardManagerImpl::_getScale(SPDesktop *desktop, Geom::Point const &min, Geom::Point const &max, Geom::Rect const &obj_rect, bool apply_x, bool apply_y)
+{
+    double scale_x = 1.0;
+    double scale_y = 1.0;
+
+    if (apply_x) {
+        scale_x = (max[Geom::X] - min[Geom::X]) / obj_rect[Geom::X].extent();
+    }
+    if (apply_y) {
+        scale_y = (max[Geom::Y] - min[Geom::Y]) / obj_rect[Geom::Y].extent();
+    }
+    // If the "lock aspect ratio" button is pressed and we paste only a single coordinate,
+    // resize the second one by the same ratio too
+    if (desktop && desktop->isToolboxButtonActive("lock")) {
+        if (apply_x && !apply_y) {
+            scale_y = scale_x;
+        }
+        if (apply_y && !apply_x) {
+            scale_x = scale_y;
+        }
+    }
+
+    return Geom::Scale(scale_x, scale_y);
+}
+
+
+/**
+ * Find the most suitable clipboard target.
+ */
+Glib::ustring ClipboardManagerImpl::_getBestTarget()
+{
+    auto targets = _clipboard->wait_for_targets();
+
+    // clipboard target debugging snippet
+    /*
+    g_message("Begin clipboard targets");
+    for ( std::list<Glib::ustring>::iterator x = targets.begin() ; x != targets.end(); ++x )
+        g_message("Clipboard target: %s", (*x).data());
+    g_message("End clipboard targets\n");
+    //*/
+
+    for (auto & _preferred_target : _preferred_targets)
+    {
+        if ( std::find(targets.begin(), targets.end(), _preferred_target) != targets.end() ) {
+            return _preferred_target;
+        }
+    }
+#ifdef _WIN32
+    if (OpenClipboard(NULL))
+    {   // If both bitmap and metafile are present, pick the one that was exported first.
+        UINT format = EnumClipboardFormats(0);
+        while (format) {
+            if (format == CF_ENHMETAFILE || format == CF_DIB || format == CF_BITMAP) {
+                break;
+            }
+            format = EnumClipboardFormats(format);
+        }
+        CloseClipboard();
+
+        if (format == CF_ENHMETAFILE) {
+            return "CF_ENHMETAFILE";
+        }
+        if (format == CF_DIB || format == CF_BITMAP) {
+            return CLIPBOARD_GDK_PIXBUF_TARGET;
+        }
+    }
+
+    if (IsClipboardFormatAvailable(CF_ENHMETAFILE)) {
+        return "CF_ENHMETAFILE";
+    }
+#endif
+    if (_clipboard->wait_is_image_available()) {
+        return CLIPBOARD_GDK_PIXBUF_TARGET;
+    }
+    if (_clipboard->wait_is_text_available()) {
+        return CLIPBOARD_TEXT_TARGET;
+    }
+
+    return "";
+}
+
+
+/**
+ * Set the clipboard targets to reflect the mimetypes Inkscape can output.
+ */
+void ClipboardManagerImpl::_setClipboardTargets()
+{
+    Inkscape::Extension::DB::OutputList outlist;
+    Inkscape::Extension::db.get_output_list(outlist);
+    std::vector<Gtk::TargetEntry> target_list;
+
+    bool plaintextSet = false;
+    for (Inkscape::Extension::DB::OutputList::const_iterator out = outlist.begin() ; out != outlist.end() ; ++out) {
+        if ( !(*out)->deactivated() ) {
+            Glib::ustring mime = (*out)->get_mimetype();
+            if (mime != CLIPBOARD_TEXT_TARGET) {
+                if ( !plaintextSet && (mime.find("svg") == Glib::ustring::npos) ) {
+                    target_list.emplace_back(CLIPBOARD_TEXT_TARGET);
+                    plaintextSet = true;
+                }
+                target_list.emplace_back(mime);
+            }
+        }
+    }
+
+    // Add PNG export explicitly since there is no extension for this...
+    // On Windows, GTK will also present this as a CF_DIB/CF_BITMAP
+    target_list.emplace_back( "image/png" );
+
+    _clipboard->set(target_list,
+        sigc::mem_fun(*this, &ClipboardManagerImpl::_onGet),
+        sigc::mem_fun(*this, &ClipboardManagerImpl::_onClear));
+
+#ifdef _WIN32
+    // If the "image/x-emf" target handled by the emf extension would be
+    // presented as a CF_ENHMETAFILE automatically (just like an "image/bmp"
+    // is presented as a CF_BITMAP) this code would not be needed.. ???
+    // Or maybe there is some other way to achieve the same?
+
+    // Note: Metafile is the only format that is rendered and stored in clipboard
+    // on Copy, all other formats are rendered only when needed by a Paste command.
+
+    // FIXME: This should at least be rewritten to use "delayed rendering".
+    //        If possible make it delayed rendering by using GTK API only.
+
+    if (OpenClipboard(NULL)) {
+        if ( _clipboardSPDoc != NULL ) {
+            const Glib::ustring target = "image/x-emf";
+
+            Inkscape::Extension::DB::OutputList outlist;
+            Inkscape::Extension::db.get_output_list(outlist);
+            Inkscape::Extension::DB::OutputList::const_iterator out = outlist.begin();
+            for ( ; out != outlist.end() && target != (*out)->get_mimetype() ; ++out) {
+            }
+            if ( out != outlist.end() ) {
+                // FIXME: Temporary hack until we add support for memory output.
+                // Save to a temporary file, read it back and then set the clipboard contents
+                gchar *filename = g_build_filename( g_get_user_cache_dir(), "inkscape-clipboard-export.emf", nullptr );
+
+                try {
+                    (*out)->save(_clipboardSPDoc.get(), filename);
+                    HENHMETAFILE hemf = GetEnhMetaFileA(filename);
+                    if (hemf) {
+                        SetClipboardData(CF_ENHMETAFILE, hemf);
+                        DeleteEnhMetaFile(hemf);
+                    }
+                } catch (...) {
+                }
+                g_unlink(filename); // delete the temporary file
+                g_free(filename);
+            }
+        }
+        CloseClipboard();
+    }
+#endif
+}
+
+
+/**
+ * Set the string representation of a 32-bit RGBA color as the clipboard contents.
+ */
+void ClipboardManagerImpl::_setClipboardColor(guint32 color)
+{
+    gchar colorstr[16];
+    g_snprintf(colorstr, 16, "%08x", color);
+    _clipboard->set_text(colorstr);
+}
+
+
+/**
+ * Put a notification on the message stack.
+ */
+void ClipboardManagerImpl::_userWarn(SPDesktop *desktop, char const *msg)
+{
+    if(desktop)
+        desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, msg);
+}
+
+/* #######################################
+          ClipboardManager class
+   ####################################### */
+
+ClipboardManager *ClipboardManager::_instance = nullptr;
+
+ClipboardManager::ClipboardManager() = default;
+ClipboardManager::~ClipboardManager() = default;
+ClipboardManager *ClipboardManager::get()
+{
+    if ( _instance == nullptr ) {
+        _instance = new ClipboardManagerImpl;
+    }
+
+    return _instance;
+}
+
+} // namespace Inkscape
+} // namespace IO
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :