diff options
Diffstat (limited to 'widget/gtk/nsDragService.cpp')
| -rw-r--r-- | widget/gtk/nsDragService.cpp | 2122 |
1 files changed, 2122 insertions, 0 deletions
diff --git a/widget/gtk/nsDragService.cpp b/widget/gtk/nsDragService.cpp new file mode 100644 index 0000000000..7d57c35df9 --- /dev/null +++ b/widget/gtk/nsDragService.cpp @@ -0,0 +1,2122 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=4 et sw=2 tw=80: */ +/* 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 "nsDragService.h" +#include "nsArrayUtils.h" +#include "nsIObserverService.h" +#include "nsWidgetsCID.h" +#include "nsWindow.h" +#include "nsSystemInfo.h" +#include "nsXPCOM.h" +#include "nsICookieJarSettings.h" +#include "nsISupportsPrimitives.h" +#include "nsIIOService.h" +#include "nsIFileURL.h" +#include "nsNetUtil.h" +#include "mozilla/Logging.h" +#include "nsTArray.h" +#include "nsPrimitiveHelpers.h" +#include "prtime.h" +#include "prthread.h" +#include <dlfcn.h> +#include <gtk/gtk.h> +#include <gdk/gdkx.h> +#include "nsCRT.h" +#include "mozilla/BasicEvents.h" +#include "mozilla/Services.h" +#include "mozilla/ClearOnShutdown.h" +#include "mozilla/PresShell.h" +#include "mozilla/ScopeExit.h" +#include "GRefPtr.h" + +#include "gfxXlibSurface.h" +#include "gfxContext.h" +#include "nsImageToPixbuf.h" +#include "nsPresContext.h" +#include "nsIContent.h" +#include "mozilla/dom/Document.h" +#include "nsViewManager.h" +#include "nsIFrame.h" +#include "nsGtkUtils.h" +#include "nsGtkKeyUtils.h" +#include "mozilla/gfx/2D.h" +#include "gfxPlatform.h" +#include "ScreenHelperGTK.h" +#include "nsArrayUtils.h" +#ifdef MOZ_WAYLAND +# include "nsClipboardWayland.h" +# include "gfxPlatformGtk.h" +#endif + +using namespace mozilla; +using namespace mozilla::gfx; + +#define NS_SYSTEMINFO_CONTRACTID "@mozilla.org/system-info;1" + +// This sets how opaque the drag image is +#define DRAG_IMAGE_ALPHA_LEVEL 0.5 + +// These values are copied from GtkDragResult (rather than using GtkDragResult +// directly) so that this code can be compiled against versions of GTK+ that +// do not have GtkDragResult. +// GtkDragResult is available from GTK+ version 2.12. +enum { + MOZ_GTK_DRAG_RESULT_SUCCESS, + MOZ_GTK_DRAG_RESULT_NO_TARGET, + MOZ_GTK_DRAG_RESULT_USER_CANCELLED, + MOZ_GTK_DRAG_RESULT_TIMEOUT_EXPIRED, + MOZ_GTK_DRAG_RESULT_GRAB_BROKEN, + MOZ_GTK_DRAG_RESULT_ERROR +}; + +static LazyLogModule sDragLm("nsDragService"); + +// data used for synthetic periodic motion events sent to the source widget +// grabbing real events for the drag. +static guint sMotionEventTimerID; +static GdkEvent* sMotionEvent; +static GtkWidget* sGrabWidget; + +static const char gMimeListType[] = "application/x-moz-internal-item-list"; +static const char gMozUrlType[] = "_NETSCAPE_URL"; +static const char gTextUriListType[] = "text/uri-list"; +static const char gTextPlainUTF8Type[] = "text/plain;charset=utf-8"; +static const char gXdndDirectSaveType[] = "XdndDirectSave0"; +static const char gTabDropType[] = "application/x-moz-tabbrowser-tab"; + +static void invisibleSourceDragBegin(GtkWidget* aWidget, + GdkDragContext* aContext, gpointer aData); + +static void invisibleSourceDragEnd(GtkWidget* aWidget, GdkDragContext* aContext, + gpointer aData); + +static gboolean invisibleSourceDragFailed(GtkWidget* aWidget, + GdkDragContext* aContext, + gint aResult, gpointer aData); + +static void invisibleSourceDragDataGet(GtkWidget* aWidget, + GdkDragContext* aContext, + GtkSelectionData* aSelectionData, + guint aInfo, guint32 aTime, + gpointer aData); + +nsDragService::nsDragService() + : mScheduledTask(eDragTaskNone), + mTaskSource(0) +#ifdef MOZ_WAYLAND + , + mPendingWaylandDragContext(nullptr), + mTargetWaylandDragContext(nullptr) +#endif +{ + // We have to destroy the hidden widget before the event loop stops + // running. + nsCOMPtr<nsIObserverService> obsServ = + mozilla::services::GetObserverService(); + obsServ->AddObserver(this, "quit-application", false); + + // our hidden source widget + // Using an offscreen window works around bug 983843. + mHiddenWidget = gtk_offscreen_window_new(); + // make sure that the widget is realized so that + // we can use it as a drag source. + gtk_widget_realize(mHiddenWidget); + // hook up our internal signals so that we can get some feedback + // from our drag source + g_signal_connect(mHiddenWidget, "drag_begin", + G_CALLBACK(invisibleSourceDragBegin), this); + g_signal_connect(mHiddenWidget, "drag_data_get", + G_CALLBACK(invisibleSourceDragDataGet), this); + g_signal_connect(mHiddenWidget, "drag_end", + G_CALLBACK(invisibleSourceDragEnd), this); + // drag-failed is available from GTK+ version 2.12 + guint dragFailedID = + g_signal_lookup("drag-failed", G_TYPE_FROM_INSTANCE(mHiddenWidget)); + if (dragFailedID) { + g_signal_connect_closure_by_id( + mHiddenWidget, dragFailedID, 0, + g_cclosure_new(G_CALLBACK(invisibleSourceDragFailed), this, nullptr), + FALSE); + } + + // set up our logging module + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::nsDragService")); + mCanDrop = false; + mTargetDragDataReceived = false; + mTargetDragData = 0; + mTargetDragDataLen = 0; +} + +nsDragService::~nsDragService() { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::~nsDragService")); + if (mTaskSource) g_source_remove(mTaskSource); +} + +NS_IMPL_ISUPPORTS_INHERITED(nsDragService, nsBaseDragService, nsIObserver) + +mozilla::StaticRefPtr<nsDragService> sDragServiceInstance; +/* static */ +already_AddRefed<nsDragService> nsDragService::GetInstance() { + if (gfxPlatform::IsHeadless()) { + return nullptr; + } + if (!sDragServiceInstance) { + sDragServiceInstance = new nsDragService(); + ClearOnShutdown(&sDragServiceInstance); + } + + RefPtr<nsDragService> service = sDragServiceInstance.get(); + return service.forget(); +} + +// nsIObserver + +NS_IMETHODIMP +nsDragService::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + if (!nsCRT::strcmp(aTopic, "quit-application")) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("nsDragService::Observe(\"quit-application\")")); + if (mHiddenWidget) { + gtk_widget_destroy(mHiddenWidget); + mHiddenWidget = 0; + } + TargetResetData(); + } else { + MOZ_ASSERT_UNREACHABLE("unexpected topic"); + return NS_ERROR_UNEXPECTED; + } + + return NS_OK; +} + +// Support for periodic drag events + +// http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#drag-and-drop-processing-model +// and the Xdnd protocol both recommend that drag events are sent periodically, +// but GTK does not normally provide this. +// +// Here GTK is periodically stimulated by copies of the most recent mouse +// motion events so as to send drag position messages to the destination when +// appropriate (after it has received a status event from the previous +// message). +// +// (If events were sent only on the destination side then the destination +// would have no message to which it could reply with a drag status. Without +// sending a drag status to the source, the destination would not be able to +// change its feedback re whether it could accept the drop, and so the +// source's behavior on drop will not be consistent.) + +static gboolean DispatchMotionEventCopy(gpointer aData) { + // Clear the timer id before OnSourceGrabEventAfter is called during event + // dispatch. + sMotionEventTimerID = 0; + + GdkEvent* event = sMotionEvent; + sMotionEvent = nullptr; + // If there is no longer a grab on the widget, then the drag is over and + // there is no need to continue drag motion. + if (gtk_widget_has_grab(sGrabWidget)) { + gtk_propagate_event(sGrabWidget, event); + } + gdk_event_free(event); + + // Cancel this timer; + // We've already started another if the motion event was dispatched. + return FALSE; +} + +static void OnSourceGrabEventAfter(GtkWidget* widget, GdkEvent* event, + gpointer user_data) { + // If there is no longer a grab on the widget, then the drag motion is + // over (though the data may not be fetched yet). + if (!gtk_widget_has_grab(sGrabWidget)) return; + + if (event->type == GDK_MOTION_NOTIFY) { + if (sMotionEvent) { + gdk_event_free(sMotionEvent); + } + sMotionEvent = gdk_event_copy(event); + + // Update the cursor position. The last of these recorded gets used for + // the eDragEnd event. + nsDragService* dragService = static_cast<nsDragService*>(user_data); + gint scale = mozilla::widget::ScreenHelperGTK::GetGTKMonitorScaleFactor(); + auto p = LayoutDeviceIntPoint::Round(event->motion.x_root * scale, + event->motion.y_root * scale); + dragService->SetDragEndPoint(p); + } else if (sMotionEvent && + (event->type == GDK_KEY_PRESS || event->type == GDK_KEY_RELEASE)) { + // Update modifier state from key events. + sMotionEvent->motion.state = event->key.state; + } else { + return; + } + + if (sMotionEventTimerID) { + g_source_remove(sMotionEventTimerID); + } + + // G_PRIORITY_DEFAULT_IDLE is lower priority than GDK's redraw idle source + // and lower than GTK's idle source that sends drag position messages after + // motion-notify signals. + // + // http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#drag-and-drop-processing-model + // recommends an interval of 350ms +/- 200ms. + sMotionEventTimerID = g_timeout_add_full( + G_PRIORITY_DEFAULT_IDLE, 350, DispatchMotionEventCopy, nullptr, nullptr); +} + +static GtkWindow* GetGtkWindow(dom::Document* aDocument) { + if (!aDocument) return nullptr; + + PresShell* presShell = aDocument->GetPresShell(); + if (!presShell) { + return nullptr; + } + + RefPtr<nsViewManager> vm = presShell->GetViewManager(); + if (!vm) return nullptr; + + nsCOMPtr<nsIWidget> widget; + vm->GetRootWidget(getter_AddRefs(widget)); + if (!widget) return nullptr; + + GtkWidget* gtkWidget = + static_cast<nsWindow*>(widget.get())->GetMozContainerWidget(); + if (!gtkWidget) return nullptr; + + GtkWidget* toplevel = nullptr; + toplevel = gtk_widget_get_toplevel(gtkWidget); + if (!GTK_IS_WINDOW(toplevel)) return nullptr; + + return GTK_WINDOW(toplevel); +} + +// nsIDragService + +NS_IMETHODIMP +nsDragService::InvokeDragSession( + nsINode* aDOMNode, nsIPrincipal* aPrincipal, nsIContentSecurityPolicy* aCsp, + nsICookieJarSettings* aCookieJarSettings, nsIArray* aArrayTransferables, + uint32_t aActionType, + nsContentPolicyType aContentPolicyType = nsIContentPolicy::TYPE_OTHER) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::InvokeDragSession")); + + // If the previous source drag has not yet completed, signal handlers need + // to be removed from sGrabWidget and dragend needs to be dispatched to + // the source node, but we can't call EndDragSession yet because we don't + // know whether or not the drag succeeded. + if (mSourceNode) return NS_ERROR_NOT_AVAILABLE; + + return nsBaseDragService::InvokeDragSession( + aDOMNode, aPrincipal, aCsp, aCookieJarSettings, aArrayTransferables, + aActionType, aContentPolicyType); +} + +// nsBaseDragService +nsresult nsDragService::InvokeDragSessionImpl( + nsIArray* aArrayTransferables, const Maybe<CSSIntRegion>& aRegion, + uint32_t aActionType) { + // make sure that we have an array of transferables to use + if (!aArrayTransferables) return NS_ERROR_INVALID_ARG; + // set our reference to the transferables. this will also addref + // the transferables since we're going to hang onto this beyond the + // length of this call + mSourceDataItems = aArrayTransferables; + // get the list of items we offer for drags + GtkTargetList* sourceList = GetSourceList(); + + if (!sourceList) return NS_OK; + + // save our action type + GdkDragAction action = GDK_ACTION_DEFAULT; + + if (aActionType & DRAGDROP_ACTION_COPY) + action = (GdkDragAction)(action | GDK_ACTION_COPY); + if (aActionType & DRAGDROP_ACTION_MOVE) + action = (GdkDragAction)(action | GDK_ACTION_MOVE); + if (aActionType & DRAGDROP_ACTION_LINK) + action = (GdkDragAction)(action | GDK_ACTION_LINK); + + // Create a fake event for the drag so we can pass the time (so to speak). + // If we don't do this, then, when the timestamp for the pending button + // release event is used for the ungrab, the ungrab can fail due to the + // timestamp being _earlier_ than CurrentTime. + GdkEvent event; + memset(&event, 0, sizeof(GdkEvent)); + event.type = GDK_BUTTON_PRESS; + event.button.window = gtk_widget_get_window(mHiddenWidget); + event.button.time = nsWindow::GetLastUserInputTime(); + + // Put the drag widget in the window group of the source node so that the + // gtk_grab_add during gtk_drag_begin is effective. + // gtk_window_get_group(nullptr) returns the default window group. + GtkWindowGroup* window_group = + gtk_window_get_group(GetGtkWindow(mSourceDocument)); + gtk_window_group_add_window(window_group, GTK_WINDOW(mHiddenWidget)); + + // Get device for event source + GdkDisplay* display = gdk_display_get_default(); + GdkDeviceManager* device_manager = gdk_display_get_device_manager(display); + event.button.device = gdk_device_manager_get_client_pointer(device_manager); + + // start our drag. + GdkDragContext* context = + gtk_drag_begin(mHiddenWidget, sourceList, action, 1, &event); + + nsresult rv; + if (context) { + StartDragSession(); + + // GTK uses another hidden window for receiving mouse events. + sGrabWidget = gtk_window_group_get_current_grab(window_group); + if (sGrabWidget) { + g_object_ref(sGrabWidget); + // Only motion and key events are required but connect to + // "event-after" as this is never blocked by other handlers. + g_signal_connect(sGrabWidget, "event-after", + G_CALLBACK(OnSourceGrabEventAfter), this); + } + // We don't have a drag end point yet. + mEndDragPoint = LayoutDeviceIntPoint(-1, -1); + rv = NS_OK; + } else { + rv = NS_ERROR_FAILURE; + } + + gtk_target_list_unref(sourceList); + + return rv; +} + +bool nsDragService::SetAlphaPixmap(SourceSurface* aSurface, + GdkDragContext* aContext, int32_t aXOffset, + int32_t aYOffset, + const LayoutDeviceIntRect& dragRect) { + GdkScreen* screen = gtk_widget_get_screen(mHiddenWidget); + + // Transparent drag icons need, like a lot of transparency-related things, + // a compositing X window manager + if (!gdk_screen_is_composited(screen)) return false; + +#ifdef cairo_image_surface_create +# error "Looks like we're including Mozilla's cairo instead of system cairo" +#endif + + // TODO: grab X11 pixmap or image data instead of expensive readback. + cairo_surface_t* surf = cairo_image_surface_create( + CAIRO_FORMAT_ARGB32, dragRect.width, dragRect.height); + if (!surf) return false; + + RefPtr<DrawTarget> dt = gfxPlatform::CreateDrawTargetForData( + cairo_image_surface_get_data(surf), + nsIntSize(dragRect.width, dragRect.height), + cairo_image_surface_get_stride(surf), SurfaceFormat::B8G8R8A8); + if (!dt) return false; + + dt->ClearRect(Rect(0, 0, dragRect.width, dragRect.height)); + dt->DrawSurface( + aSurface, Rect(0, 0, dragRect.width, dragRect.height), + Rect(0, 0, dragRect.width, dragRect.height), DrawSurfaceOptions(), + DrawOptions(DRAG_IMAGE_ALPHA_LEVEL, CompositionOp::OP_SOURCE)); + + cairo_surface_mark_dirty(surf); + cairo_surface_set_device_offset(surf, -aXOffset, -aYOffset); + + // Ensure that the surface is drawn at the correct scale on HiDPI displays. + static auto sCairoSurfaceSetDeviceScalePtr = + (void (*)(cairo_surface_t*, double, double))dlsym( + RTLD_DEFAULT, "cairo_surface_set_device_scale"); + if (sCairoSurfaceSetDeviceScalePtr) { + gint scale = mozilla::widget::ScreenHelperGTK::GetGTKMonitorScaleFactor(); + sCairoSurfaceSetDeviceScalePtr(surf, scale, scale); + } + + gtk_drag_set_icon_surface(aContext, surf); + cairo_surface_destroy(surf); + return true; +} + +NS_IMETHODIMP +nsDragService::StartDragSession() { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::StartDragSession")); + return nsBaseDragService::StartDragSession(); +} + +NS_IMETHODIMP +nsDragService::EndDragSession(bool aDoneDrag, uint32_t aKeyModifiers) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("nsDragService::EndDragSession %d", aDoneDrag)); + + if (sGrabWidget) { + g_signal_handlers_disconnect_by_func( + sGrabWidget, FuncToGpointer(OnSourceGrabEventAfter), this); + g_object_unref(sGrabWidget); + sGrabWidget = nullptr; + + if (sMotionEventTimerID) { + g_source_remove(sMotionEventTimerID); + sMotionEventTimerID = 0; + } + if (sMotionEvent) { + gdk_event_free(sMotionEvent); + sMotionEvent = nullptr; + } + } + + // unset our drag action + SetDragAction(DRAGDROP_ACTION_NONE); + + // We're done with the drag context. + mTargetDragContextForRemote = nullptr; +#ifdef MOZ_WAYLAND + mTargetWaylandDragContextForRemote = nullptr; +#endif + + return nsBaseDragService::EndDragSession(aDoneDrag, aKeyModifiers); +} + +// nsIDragSession +NS_IMETHODIMP +nsDragService::SetCanDrop(bool aCanDrop) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::SetCanDrop %d", aCanDrop)); + mCanDrop = aCanDrop; + return NS_OK; +} + +NS_IMETHODIMP +nsDragService::GetCanDrop(bool* aCanDrop) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::GetCanDrop")); + *aCanDrop = mCanDrop; + return NS_OK; +} + +static void UTF16ToNewUTF8(const char16_t* aUTF16, uint32_t aUTF16Len, + char** aUTF8, uint32_t* aUTF8Len) { + nsDependentSubstring utf16(aUTF16, aUTF16Len); + *aUTF8 = ToNewUTF8String(utf16, aUTF8Len); +} + +static void UTF8ToNewUTF16(const char* aUTF8, uint32_t aUTF8Len, + char16_t** aUTF16, uint32_t* aUTF16Len) { + nsDependentCSubstring utf8(aUTF8, aUTF8Len); + *aUTF16 = UTF8ToNewUnicode(utf8, aUTF16Len); +} + +// count the number of URIs in some text/uri-list format data. +static uint32_t CountTextUriListItems(const char* data, uint32_t datalen) { + const char* p = data; + const char* endPtr = p + datalen; + uint32_t count = 0; + + while (p < endPtr) { + // skip whitespace (if any) + while (p < endPtr && *p != '\0' && isspace(*p)) p++; + // if we aren't at the end of the line ... + if (p != endPtr && *p != '\0' && *p != '\n' && *p != '\r') count++; + // skip to the end of the line + while (p < endPtr && *p != '\0' && *p != '\n') p++; + p++; // skip the actual newline as well. + } + return count; +} + +// extract an item from text/uri-list formatted data and convert it to +// unicode. +static void GetTextUriListItem(const char* data, uint32_t datalen, + uint32_t aItemIndex, char16_t** convertedText, + uint32_t* convertedTextLen) { + const char* p = data; + const char* endPtr = p + datalen; + unsigned int count = 0; + + *convertedText = nullptr; + while (p < endPtr) { + // skip whitespace (if any) + while (p < endPtr && *p != '\0' && isspace(*p)) p++; + // if we aren't at the end of the line, we have a url + if (p != endPtr && *p != '\0' && *p != '\n' && *p != '\r') count++; + // this is the item we are after ... + if (aItemIndex + 1 == count) { + const char* q = p; + while (q < endPtr && *q != '\0' && *q != '\n' && *q != '\r') q++; + UTF8ToNewUTF16(p, q - p, convertedText, convertedTextLen); + break; + } + // skip to the end of the line + while (p < endPtr && *p != '\0' && *p != '\n') p++; + p++; // skip the actual newline as well. + } + + // didn't find the desired item, so just pass the whole lot + if (!*convertedText) { + UTF8ToNewUTF16(data, datalen, convertedText, convertedTextLen); + } +} + +NS_IMETHODIMP +nsDragService::GetNumDropItems(uint32_t* aNumItems) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::GetNumDropItems")); + + if (!mTargetWidget) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("*** warning: GetNumDropItems \ + called without a valid target widget!\n")); + *aNumItems = 0; + return NS_OK; + } + + bool isList = IsTargetContextList(); + if (isList) + mSourceDataItems->GetLength(aNumItems); + else { + GdkAtom gdkFlavor = gdk_atom_intern(gTextUriListType, FALSE); + GetTargetDragData(gdkFlavor); + if (mTargetDragData) { + const char* data = reinterpret_cast<char*>(mTargetDragData); + *aNumItems = CountTextUriListItems(data, mTargetDragDataLen); + } else + *aNumItems = 1; + } + MOZ_LOG(sDragLm, LogLevel::Debug, ("%d items", *aNumItems)); + return NS_OK; +} + +NS_IMETHODIMP +nsDragService::GetData(nsITransferable* aTransferable, uint32_t aItemIndex) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::GetData %d", aItemIndex)); + + // make sure that we have a transferable + if (!aTransferable) return NS_ERROR_INVALID_ARG; + + if (!mTargetWidget) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("*** warning: GetData \ + called without a valid target widget!\n")); + return NS_ERROR_FAILURE; + } + + // get flavor list that includes all acceptable flavors (including + // ones obtained through conversion). + nsTArray<nsCString> flavors; + nsresult rv = aTransferable->FlavorsTransferableCanImport(flavors); + if (NS_FAILED(rv)) return rv; + + // check to see if this is an internal list + bool isList = IsTargetContextList(); + + if (isList) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("it's a list...")); + // find a matching flavor + for (uint32_t i = 0; i < flavors.Length(); ++i) { + nsCString& flavorStr = flavors[i]; + MOZ_LOG(sDragLm, LogLevel::Debug, ("flavor is %s\n", flavorStr.get())); + // get the item with the right index + nsCOMPtr<nsITransferable> item = + do_QueryElementAt(mSourceDataItems, aItemIndex); + if (!item) continue; + + nsCOMPtr<nsISupports> data; + MOZ_LOG(sDragLm, LogLevel::Debug, + ("trying to get transfer data for %s\n", flavorStr.get())); + rv = item->GetTransferData(flavorStr.get(), getter_AddRefs(data)); + if (NS_FAILED(rv)) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("failed.\n")); + continue; + } + MOZ_LOG(sDragLm, LogLevel::Debug, ("succeeded.\n")); + rv = aTransferable->SetTransferData(flavorStr.get(), data); + if (NS_FAILED(rv)) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("fail to set transfer data into transferable!\n")); + continue; + } + // ok, we got the data + return NS_OK; + } + // if we got this far, we failed + return NS_ERROR_FAILURE; + } + + // Now walk down the list of flavors. When we find one that is + // actually present, copy out the data into the transferable in that + // format. SetTransferData() implicitly handles conversions. + for (uint32_t i = 0; i < flavors.Length(); ++i) { + nsCString& flavorStr = flavors[i]; + GdkAtom gdkFlavor = gdk_atom_intern(flavorStr.get(), FALSE); + MOZ_LOG(sDragLm, LogLevel::Debug, + ("looking for data in type %s, gdk flavor %p\n", flavorStr.get(), + gdkFlavor)); + bool dataFound = false; + if (gdkFlavor) { + GetTargetDragData(gdkFlavor); + } + if (mTargetDragData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("dataFound = true\n")); + dataFound = true; + } else { + MOZ_LOG(sDragLm, LogLevel::Debug, ("dataFound = false\n")); + + // Dragging and dropping from the file manager would cause us + // to parse the source text as a nsIFile URL. + if (flavorStr.EqualsLiteral(kFileMime)) { + gdkFlavor = gdk_atom_intern(kTextMime, FALSE); + GetTargetDragData(gdkFlavor); + if (!mTargetDragData) { + gdkFlavor = gdk_atom_intern(gTextUriListType, FALSE); + GetTargetDragData(gdkFlavor); + } + if (mTargetDragData) { + const char* text = static_cast<char*>(mTargetDragData); + char16_t* convertedText = nullptr; + uint32_t convertedTextLen = 0; + + GetTextUriListItem(text, mTargetDragDataLen, aItemIndex, + &convertedText, &convertedTextLen); + + if (convertedText) { + nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv); + nsCOMPtr<nsIURI> fileURI; + rv = ioService->NewURI(NS_ConvertUTF16toUTF8(convertedText), + nullptr, nullptr, getter_AddRefs(fileURI)); + if (NS_SUCCEEDED(rv)) { + nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(fileURI, &rv); + if (NS_SUCCEEDED(rv)) { + nsCOMPtr<nsIFile> file; + rv = fileURL->GetFile(getter_AddRefs(file)); + if (NS_SUCCEEDED(rv)) { + // The common wrapping code at the end of + // this function assumes the data is text + // and calls text-specific operations. + // Make a secret hideout here for nsIFile + // objects and return early. + aTransferable->SetTransferData(flavorStr.get(), file); + g_free(convertedText); + return NS_OK; + } + } + } + g_free(convertedText); + } + continue; + } + } + + // if we are looking for text/unicode and we fail to find it + // on the clipboard first, try again with text/plain. If that + // is present, convert it to unicode. + if (flavorStr.EqualsLiteral(kUnicodeMime)) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("we were looking for text/unicode... \ + trying with text/plain;charset=utf-8\n")); + gdkFlavor = gdk_atom_intern(gTextPlainUTF8Type, FALSE); + GetTargetDragData(gdkFlavor); + if (mTargetDragData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("Got textplain data\n")); + const char* castedText = reinterpret_cast<char*>(mTargetDragData); + char16_t* convertedText = nullptr; + NS_ConvertUTF8toUTF16 ucs2string(castedText, mTargetDragDataLen); + convertedText = ToNewUnicode(ucs2string, mozilla::fallible); + if (convertedText) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("successfully converted plain text \ + to unicode.\n")); + // out with the old, in with the new + g_free(mTargetDragData); + mTargetDragData = convertedText; + mTargetDragDataLen = ucs2string.Length() * 2; + dataFound = true; + } // if plain text data on clipboard + } else { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("we were looking for text/unicode... \ + trying again with text/plain\n")); + gdkFlavor = gdk_atom_intern(kTextMime, FALSE); + GetTargetDragData(gdkFlavor); + if (mTargetDragData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("Got textplain data\n")); + const char* castedText = reinterpret_cast<char*>(mTargetDragData); + char16_t* convertedText = nullptr; + uint32_t convertedTextLen = 0; + UTF8ToNewUTF16(castedText, mTargetDragDataLen, &convertedText, + &convertedTextLen); + if (convertedText) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("successfully converted plain text \ + to unicode.\n")); + // out with the old, in with the new + g_free(mTargetDragData); + mTargetDragData = convertedText; + mTargetDragDataLen = convertedTextLen * 2; + dataFound = true; + } // if plain text data on clipboard + } // if plain text flavor present + } // if plain text charset=utf-8 flavor present + } // if looking for text/unicode + + // if we are looking for text/x-moz-url and we failed to find + // it on the clipboard, try again with text/uri-list, and then + // _NETSCAPE_URL + if (flavorStr.EqualsLiteral(kURLMime)) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("we were looking for text/x-moz-url...\ + trying again with text/uri-list\n")); + gdkFlavor = gdk_atom_intern(gTextUriListType, FALSE); + GetTargetDragData(gdkFlavor); + if (mTargetDragData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("Got text/uri-list data\n")); + const char* data = reinterpret_cast<char*>(mTargetDragData); + char16_t* convertedText = nullptr; + uint32_t convertedTextLen = 0; + + GetTextUriListItem(data, mTargetDragDataLen, aItemIndex, + &convertedText, &convertedTextLen); + + if (convertedText) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("successfully converted \ + _NETSCAPE_URL to unicode.\n")); + // out with the old, in with the new + g_free(mTargetDragData); + mTargetDragData = convertedText; + mTargetDragDataLen = convertedTextLen * 2; + dataFound = true; + } + } else { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("failed to get text/uri-list data\n")); + } + if (!dataFound) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("we were looking for text/x-moz-url...\ + trying again with _NETSCAP_URL\n")); + gdkFlavor = gdk_atom_intern(gMozUrlType, FALSE); + GetTargetDragData(gdkFlavor); + if (mTargetDragData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("Got _NETSCAPE_URL data\n")); + const char* castedText = reinterpret_cast<char*>(mTargetDragData); + char16_t* convertedText = nullptr; + uint32_t convertedTextLen = 0; + UTF8ToNewUTF16(castedText, mTargetDragDataLen, &convertedText, + &convertedTextLen); + if (convertedText) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("successfully converted _NETSCAPE_URL \ + to unicode.\n")); + // out with the old, in with the new + g_free(mTargetDragData); + mTargetDragData = convertedText; + mTargetDragDataLen = convertedTextLen * 2; + dataFound = true; + } + } else { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("failed to get _NETSCAPE_URL data\n")); + } + } + } + + } // else we try one last ditch effort to find our data + + if (dataFound) { + if (!flavorStr.EqualsLiteral(kCustomTypesMime)) { + // the DOM only wants LF, so convert from MacOS line endings + // to DOM line endings. + nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks( + flavorStr, &mTargetDragData, + reinterpret_cast<int*>(&mTargetDragDataLen)); + } + + // put it into the transferable. + nsCOMPtr<nsISupports> genericDataWrapper; + nsPrimitiveHelpers::CreatePrimitiveForData( + flavorStr, mTargetDragData, mTargetDragDataLen, + getter_AddRefs(genericDataWrapper)); + aTransferable->SetTransferData(flavorStr.get(), genericDataWrapper); + // we found one, get out of this loop! + MOZ_LOG(sDragLm, LogLevel::Debug, ("dataFound and converted!\n")); + break; + } + } + + return NS_OK; +} + +NS_IMETHODIMP +nsDragService::IsDataFlavorSupported(const char* aDataFlavor, bool* _retval) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("nsDragService::IsDataFlavorSupported %s", aDataFlavor)); + if (!_retval) return NS_ERROR_INVALID_ARG; + + // set this to no by default + *_retval = false; + + // check to make sure that we have a drag object set, here + if (!mTargetWidget) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("*** warning: IsDataFlavorSupported \ + called without a valid target widget!\n")); + return NS_OK; + } + + // check to see if the target context is a list. + bool isList = IsTargetContextList(); + // if it is, just look in the internal data since we are the source + // for it. + if (isList) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("It's a list..")); + uint32_t numDragItems = 0; + // if we don't have mDataItems we didn't start this drag so it's + // an external client trying to fool us. + if (!mSourceDataItems) return NS_OK; + mSourceDataItems->GetLength(&numDragItems); + for (uint32_t itemIndex = 0; itemIndex < numDragItems; ++itemIndex) { + nsCOMPtr<nsITransferable> currItem = + do_QueryElementAt(mSourceDataItems, itemIndex); + if (currItem) { + nsTArray<nsCString> flavors; + currItem->FlavorsTransferableCanExport(flavors); + for (uint32_t i = 0; i < flavors.Length(); ++i) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("checking %s against %s\n", flavors[i].get(), aDataFlavor)); + if (flavors[i].Equals(aDataFlavor)) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("boioioioiooioioioing!\n")); + *_retval = true; + } + } + } + } + return NS_OK; + } + + // check the target context vs. this flavor, one at a time + GList* tmp = nullptr; + if (mTargetDragContext) { + tmp = gdk_drag_context_list_targets(mTargetDragContext); + } +#ifdef MOZ_WAYLAND + else if (mTargetWaylandDragContext) { + tmp = mTargetWaylandDragContext->GetTargets(); + } + GList* tmp_head = tmp; +#endif + + for (; tmp; tmp = tmp->next) { + /* Bug 331198 */ + GdkAtom atom = GDK_POINTER_TO_ATOM(tmp->data); + gchar* name = nullptr; + name = gdk_atom_name(atom); + MOZ_LOG(sDragLm, LogLevel::Debug, + ("checking %s against %s\n", name, aDataFlavor)); + if (name && (strcmp(name, aDataFlavor) == 0)) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("good!\n")); + *_retval = true; + } + // check for automatic text/uri-list -> text/x-moz-url mapping + if (!*_retval && name && (strcmp(name, gTextUriListType) == 0) && + (strcmp(aDataFlavor, kURLMime) == 0 || + strcmp(aDataFlavor, kFileMime) == 0)) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("good! ( it's text/uri-list and \ + we're checking against text/x-moz-url )\n")); + *_retval = true; + } + // check for automatic _NETSCAPE_URL -> text/x-moz-url mapping + if (!*_retval && name && (strcmp(name, gMozUrlType) == 0) && + (strcmp(aDataFlavor, kURLMime) == 0)) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("good! ( it's _NETSCAPE_URL and \ + we're checking against text/x-moz-url )\n")); + *_retval = true; + } + // check for auto text/plain -> text/unicode mapping + if (!*_retval && name && (strcmp(name, kTextMime) == 0) && + ((strcmp(aDataFlavor, kUnicodeMime) == 0) || + (strcmp(aDataFlavor, kFileMime) == 0))) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("good! ( it's text plain and we're checking \ + against text/unicode or application/x-moz-file)\n")); + *_retval = true; + } + g_free(name); + } + +#ifdef MOZ_WAYLAND + // mTargetWaylandDragContext->GetTargets allocates the list + // so we need to free it here. + if (!mTargetDragContext && tmp_head) { + g_list_free(tmp_head); + } +#endif + + return NS_OK; +} + +void nsDragService::ReplyToDragMotion(GdkDragContext* aDragContext) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("nsDragService::ReplyToDragMotion %d", mCanDrop)); + + GdkDragAction action = (GdkDragAction)0; + if (mCanDrop) { + // notify the dragger if we can drop + switch (mDragAction) { + case DRAGDROP_ACTION_COPY: + action = GDK_ACTION_COPY; + break; + case DRAGDROP_ACTION_LINK: + action = GDK_ACTION_LINK; + break; + case DRAGDROP_ACTION_NONE: + action = (GdkDragAction)0; + break; + default: + action = GDK_ACTION_MOVE; + break; + } + } + + gdk_drag_status(aDragContext, action, mTargetTime); +} + +#ifdef MOZ_WAYLAND +void nsDragService::ReplyToDragMotion(nsWaylandDragContext* aDragContext) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("nsDragService::ReplyToDragMotion %d", mCanDrop)); + + GdkDragAction action = (GdkDragAction)0; + if (mCanDrop) { + // notify the dragger if we can drop + switch (mDragAction) { + case DRAGDROP_ACTION_COPY: + action = GDK_ACTION_COPY; + break; + case DRAGDROP_ACTION_LINK: + action = GDK_ACTION_LINK; + break; + case DRAGDROP_ACTION_NONE: + action = (GdkDragAction)0; + break; + default: + action = GDK_ACTION_MOVE; + break; + } + } + + aDragContext->SetDragStatus(action); +} +#endif + +void nsDragService::TargetDataReceived(GtkWidget* aWidget, + GdkDragContext* aContext, gint aX, + gint aY, + GtkSelectionData* aSelectionData, + guint aInfo, guint32 aTime) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::TargetDataReceived")); + TargetResetData(); + + mTargetDragDataReceived = true; + gint len = gtk_selection_data_get_length(aSelectionData); + const guchar* data = gtk_selection_data_get_data(aSelectionData); + + GdkAtom target = gtk_selection_data_get_target(aSelectionData); + char* name = gdk_atom_name(target); + nsCString flavor(name); + g_free(name); + + if (len > 0 && data) { + mTargetDragDataLen = len; + mTargetDragData = g_malloc(mTargetDragDataLen); + memcpy(mTargetDragData, data, mTargetDragDataLen); + + nsTArray<uint8_t> copy; + if (!copy.SetLength(len, fallible)) { + return; + } + memcpy(copy.Elements(), data, len); + + mCachedData.Put(flavor, std::move(copy)); + } else { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("Failed to get data. selection data len was %d\n", + mTargetDragDataLen)); + + mCachedData.Put(flavor, nsTArray<uint8_t>()); + } +} + +bool nsDragService::IsTargetContextList(void) { + bool retval = false; + + // gMimeListType drags only work for drags within a single process. The + // gtk_drag_get_source_widget() function will return nullptr if the source + // of the drag is another app, so we use it to check if a gMimeListType + // drop will work or not. + if (mTargetDragContext && + gtk_drag_get_source_widget(mTargetDragContext) == nullptr) { + return retval; + } + + GList* tmp = nullptr; + if (mTargetDragContext) { + tmp = gdk_drag_context_list_targets(mTargetDragContext); + } +#ifdef MOZ_WAYLAND + GList* tmp_head = nullptr; + if (mTargetWaylandDragContext) { + tmp_head = tmp = mTargetWaylandDragContext->GetTargets(); + } +#endif + + // walk the list of context targets and see if one of them is a list + // of items. + for (; tmp; tmp = tmp->next) { + /* Bug 331198 */ + GdkAtom atom = GDK_POINTER_TO_ATOM(tmp->data); + gchar* name = nullptr; + name = gdk_atom_name(atom); + if (name && strcmp(name, gMimeListType) == 0) retval = true; + g_free(name); + if (retval) break; + } + +#ifdef MOZ_WAYLAND + // mTargetWaylandDragContext->GetTargets allocates the list + // so we need to free it here. + if (mTargetWaylandDragContext && tmp_head) { + g_list_free(tmp_head); + } +#endif + + return retval; +} + +// Maximum time to wait for a "drag_received" arrived, in microseconds +#define NS_DND_TIMEOUT 500000 + +void nsDragService::GetTargetDragData(GdkAtom aFlavor) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("getting data flavor %p\n", aFlavor)); + MOZ_LOG(sDragLm, LogLevel::Debug, + ("mLastWidget is %p and mLastContext is %p\n", mTargetWidget.get(), + mTargetDragContext.get())); + // reset our target data areas + TargetResetData(); + + if (mTargetDragContext) { + char* name = gdk_atom_name(aFlavor); + nsCString flavor(name); + g_free(name); + + // We keep a copy of the requested data with the same life-time + // as mTargetDragContext. + // Especially with multiple items the same data is requested + // very often. + if (nsTArray<uint8_t>* cached = mCachedData.GetValue(flavor)) { + mTargetDragDataLen = cached->Length(); + MOZ_LOG(sDragLm, LogLevel::Debug, + ("Using cached data for %s, length is %d", flavor.get(), + mTargetDragDataLen)); + + if (mTargetDragDataLen) { + mTargetDragData = g_malloc(mTargetDragDataLen); + memcpy(mTargetDragData, cached->Elements(), mTargetDragDataLen); + } + + mTargetDragDataReceived = true; + return; + } + + gtk_drag_get_data(mTargetWidget, mTargetDragContext, aFlavor, mTargetTime); + + MOZ_LOG(sDragLm, LogLevel::Debug, ("about to start inner iteration.")); + PRTime entryTime = PR_Now(); + while (!mTargetDragDataReceived && mDoingDrag) { + // check the number of iterations + MOZ_LOG(sDragLm, LogLevel::Debug, ("doing iteration...\n")); + PR_Sleep(20 * PR_TicksPerSecond() / 1000); /* sleep for 20 ms/iteration */ + if (PR_Now() - entryTime > NS_DND_TIMEOUT) break; + gtk_main_iteration(); + } + } +#ifdef MOZ_WAYLAND + else { + mTargetDragData = mTargetWaylandDragContext->GetData(gdk_atom_name(aFlavor), + &mTargetDragDataLen); + mTargetDragDataReceived = true; + } +#endif + MOZ_LOG(sDragLm, LogLevel::Debug, ("finished inner iteration\n")); +} + +void nsDragService::TargetResetData(void) { + mTargetDragDataReceived = false; + // make sure to free old data if we have to + g_free(mTargetDragData); + mTargetDragData = 0; + mTargetDragDataLen = 0; +} + +GtkTargetList* nsDragService::GetSourceList(void) { + if (!mSourceDataItems) return nullptr; + nsTArray<GtkTargetEntry*> targetArray; + GtkTargetEntry* targets; + GtkTargetList* targetList = 0; + uint32_t targetCount = 0; + unsigned int numDragItems = 0; + + mSourceDataItems->GetLength(&numDragItems); + + // Check to see if we're dragging > 1 item. + if (numDragItems > 1) { + // as the Xdnd protocol only supports a single item (or is it just + // gtk's implementation?), we don't advertise all flavours listed + // in the nsITransferable. + + // the application/x-moz-internal-item-list format, which preserves + // all information for drags within the same mozilla instance. + GtkTargetEntry* listTarget = + (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + listTarget->target = g_strdup(gMimeListType); + listTarget->flags = 0; + MOZ_LOG(sDragLm, LogLevel::Debug, + ("automatically adding target %s\n", listTarget->target)); + targetArray.AppendElement(listTarget); + + // check what flavours are supported so we can decide what other + // targets to advertise. + nsCOMPtr<nsITransferable> currItem = do_QueryElementAt(mSourceDataItems, 0); + + if (currItem) { + nsTArray<nsCString> flavors; + currItem->FlavorsTransferableCanExport(flavors); + for (uint32_t i = 0; i < flavors.Length(); ++i) { + // check if text/x-moz-url is supported. + // If so, advertise + // text/uri-list. + if (flavors[i].EqualsLiteral(kURLMime)) { + listTarget = (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + listTarget->target = g_strdup(gTextUriListType); + listTarget->flags = 0; + MOZ_LOG(sDragLm, LogLevel::Debug, + ("automatically adding target %s\n", listTarget->target)); + targetArray.AppendElement(listTarget); + } + } + } // if item is a transferable + } else if (numDragItems == 1) { + nsCOMPtr<nsITransferable> currItem = do_QueryElementAt(mSourceDataItems, 0); + if (currItem) { + nsTArray<nsCString> flavors; + currItem->FlavorsTransferableCanExport(flavors); + for (uint32_t i = 0; i < flavors.Length(); ++i) { + nsCString& flavorStr = flavors[i]; + + GtkTargetEntry* target = + (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + target->target = g_strdup(flavorStr.get()); + target->flags = 0; + MOZ_LOG(sDragLm, LogLevel::Debug, + ("adding target %s\n", target->target)); + targetArray.AppendElement(target); + + // If there is a file, add the text/uri-list type. + if (flavorStr.EqualsLiteral(kFileMime)) { + GtkTargetEntry* urilistTarget = + (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + urilistTarget->target = g_strdup(gTextUriListType); + urilistTarget->flags = 0; + MOZ_LOG(sDragLm, LogLevel::Debug, + ("automatically adding target %s\n", urilistTarget->target)); + targetArray.AppendElement(urilistTarget); + } + // Check to see if this is text/unicode. + // If it is, add text/plain + // since we automatically support text/plain + // if we support text/unicode. + else if (flavorStr.EqualsLiteral(kUnicodeMime)) { + GtkTargetEntry* plainUTF8Target = + (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + plainUTF8Target->target = g_strdup(gTextPlainUTF8Type); + plainUTF8Target->flags = 0; + MOZ_LOG( + sDragLm, LogLevel::Debug, + ("automatically adding target %s\n", plainUTF8Target->target)); + targetArray.AppendElement(plainUTF8Target); + + GtkTargetEntry* plainTarget = + (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + plainTarget->target = g_strdup(kTextMime); + plainTarget->flags = 0; + MOZ_LOG(sDragLm, LogLevel::Debug, + ("automatically adding target %s\n", plainTarget->target)); + targetArray.AppendElement(plainTarget); + } + // Check to see if this is the x-moz-url type. + // If it is, add _NETSCAPE_URL + // this is a type used by everybody. + else if (flavorStr.EqualsLiteral(kURLMime)) { + GtkTargetEntry* urlTarget = + (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + urlTarget->target = g_strdup(gMozUrlType); + urlTarget->flags = 0; + MOZ_LOG(sDragLm, LogLevel::Debug, + ("automatically adding target %s\n", urlTarget->target)); + targetArray.AppendElement(urlTarget); + } + // XdndDirectSave + else if (flavorStr.EqualsLiteral(kFilePromiseMime)) { + GtkTargetEntry* directsaveTarget = + (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry)); + directsaveTarget->target = g_strdup(gXdndDirectSaveType); + directsaveTarget->flags = 0; + MOZ_LOG( + sDragLm, LogLevel::Debug, + ("automatically adding target %s\n", directsaveTarget->target)); + targetArray.AppendElement(directsaveTarget); + } + } + } + } + + // get all the elements that we created. + targetCount = targetArray.Length(); + if (targetCount) { + // allocate space to create the list of valid targets + targets = (GtkTargetEntry*)g_malloc(sizeof(GtkTargetEntry) * targetCount); + uint32_t targetIndex; + for (targetIndex = 0; targetIndex < targetCount; ++targetIndex) { + GtkTargetEntry* disEntry = targetArray.ElementAt(targetIndex); + // this is a string reference but it will be freed later. + targets[targetIndex].target = disEntry->target; + targets[targetIndex].flags = disEntry->flags; + targets[targetIndex].info = 0; + } + targetList = gtk_target_list_new(targets, targetCount); + // clean up the target list + for (uint32_t cleanIndex = 0; cleanIndex < targetCount; ++cleanIndex) { + GtkTargetEntry* thisTarget = targetArray.ElementAt(cleanIndex); + g_free(thisTarget->target); + g_free(thisTarget); + } + g_free(targets); + } else { + // We need to create a dummy target list to be able initialize dnd. + targetList = gtk_target_list_new(nullptr, 0); + } + return targetList; +} + +void nsDragService::SourceEndDragSession(GdkDragContext* aContext, + gint aResult) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("SourceEndDragSession result %d\n", aResult)); + + // this just releases the list of data items that we provide + mSourceDataItems = nullptr; + + // Remove this property, if it exists, to satisfy the Direct Save Protocol. + GdkAtom property = gdk_atom_intern(gXdndDirectSaveType, FALSE); + gdk_property_delete(gdk_drag_context_get_source_window(aContext), property); + + if (!mDoingDrag || mScheduledTask == eDragTaskSourceEnd) + // EndDragSession() was already called on drop + // or SourceEndDragSession on drag-failed + return; + + if (mEndDragPoint.x < 0) { + // We don't have a drag end point, so guess + gint x, y; + GdkDisplay* display = gdk_display_get_default(); + if (display) { + gint scale = mozilla::widget::ScreenHelperGTK::GetGTKMonitorScaleFactor(); + gdk_display_get_pointer(display, nullptr, &x, &y, nullptr); + SetDragEndPoint(LayoutDeviceIntPoint(x * scale, y * scale)); + MOZ_LOG(sDragLm, LogLevel::Debug, + ("guess drag end point %d %d\n", x * scale, y * scale)); + } + } + + // Either the drag was aborted or the drop occurred outside the app. + // The dropEffect of mDataTransfer is not updated for motion outside the + // app, but is needed for the dragend event, so set it now. + + uint32_t dropEffect; + + if (aResult == MOZ_GTK_DRAG_RESULT_SUCCESS) { + // With GTK+ versions 2.10.x and prior the drag may have been + // cancelled (but no drag-failed signal would have been sent). + // aContext->dest_window will be non-nullptr only if the drop was + // sent. + GdkDragAction action = gdk_drag_context_get_dest_window(aContext) + ? gdk_drag_context_get_actions(aContext) + : (GdkDragAction)0; + + // Only one bit of action should be set, but, just in case someone + // does something funny, erring away from MOVE, and not recording + // unusual action combinations as NONE. + if (!action) + dropEffect = DRAGDROP_ACTION_NONE; + else if (action & GDK_ACTION_COPY) + dropEffect = DRAGDROP_ACTION_COPY; + else if (action & GDK_ACTION_LINK) + dropEffect = DRAGDROP_ACTION_LINK; + else if (action & GDK_ACTION_MOVE) + dropEffect = DRAGDROP_ACTION_MOVE; + else + dropEffect = DRAGDROP_ACTION_COPY; + + } else { + dropEffect = DRAGDROP_ACTION_NONE; + + bool isWaylandTabDrop = false; +#ifdef MOZ_WAYLAND + // Bug 1527976. Wayland protocol does not have any way how to handle + // MOZ_GTK_DRAG_RESULT_NO_TARGET drop result so consider all tab + // drops as not cancelled on wayland. + if (gfxPlatformGtk::GetPlatform()->IsWaylandDisplay() && + aResult == MOZ_GTK_DRAG_RESULT_ERROR) { + for (GList* tmp = gdk_drag_context_list_targets(aContext); tmp; + tmp = tmp->next) { + GdkAtom atom = GDK_POINTER_TO_ATOM(tmp->data); + gchar* name = gdk_atom_name(atom); + if (name && (strcmp(name, gTabDropType) == 0)) { + isWaylandTabDrop = true; + MOZ_LOG(sDragLm, LogLevel::Debug, ("is wayland tab drop\n")); + break; + } + } + } +#endif + if (aResult != MOZ_GTK_DRAG_RESULT_NO_TARGET && !isWaylandTabDrop) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("drop is user chancelled\n")); + mUserCancelled = true; + } + } + + if (mDataTransfer) { + mDataTransfer->SetDropEffectInt(dropEffect); + } + + // Schedule the appropriate drag end dom events. + Schedule(eDragTaskSourceEnd, nullptr, nullptr, nullptr, + LayoutDeviceIntPoint(), 0); +} + +static void CreateURIList(nsIArray* aItems, nsACString& aURIList) { + uint32_t length = 0; + aItems->GetLength(&length); + + for (uint32_t i = 0; i < length; ++i) { + nsCOMPtr<nsITransferable> item = do_QueryElementAt(aItems, i); + if (!item) { + continue; + } + + nsCOMPtr<nsISupports> data; + nsresult rv = item->GetTransferData(kURLMime, getter_AddRefs(data)); + if (NS_SUCCEEDED(rv)) { + nsCOMPtr<nsISupportsString> string = do_QueryInterface(data); + + nsAutoString text; + if (string) { + string->GetData(text); + } + + // text/x-moz-url is of form url + "\n" + title. + // We just want the url. + int32_t separatorPos = text.FindChar(u'\n'); + if (separatorPos >= 0) { + text.Truncate(separatorPos); + } + + AppendUTF16toUTF8(text, aURIList); + aURIList.AppendLiteral("\r\n"); + continue; + } + + // There is no URI available. If there is a file available, create + // a URI from the file. + rv = item->GetTransferData(kFileMime, getter_AddRefs(data)); + if (NS_SUCCEEDED(rv)) { + if (nsCOMPtr<nsIFile> file = do_QueryInterface(data)) { + nsCOMPtr<nsIURI> fileURI; + NS_NewFileURI(getter_AddRefs(fileURI), file); + if (fileURI) { + nsAutoCString spec; + fileURI->GetSpec(spec); + + aURIList.Append(spec); + aURIList.AppendLiteral("\r\n"); + } + } + } + } +} + +void nsDragService::SourceDataGet(GtkWidget* aWidget, GdkDragContext* aContext, + GtkSelectionData* aSelectionData, + guint32 aTime) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::SourceDataGet")); + GdkAtom target = gtk_selection_data_get_target(aSelectionData); + gchar* typeName = gdk_atom_name(target); + if (!typeName) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("failed to get atom name.\n")); + return; + } + + MOZ_LOG(sDragLm, LogLevel::Debug, ("Type is %s\n", typeName)); + auto freeTypeName = mozilla::MakeScopeExit([&] { g_free(typeName); }); + // check to make sure that we have data items to return. + if (!mSourceDataItems) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("Failed to get our data items\n")); + return; + } + + nsDependentCSubstring mimeFlavor(typeName, strlen(typeName)); + nsCOMPtr<nsITransferable> item; + item = do_QueryElementAt(mSourceDataItems, 0); + if (item) { + // if someone was asking for text/plain, lookup unicode instead so + // we can convert it. + bool needToDoConversionToPlainText = false; + const char* actualFlavor; + if (mimeFlavor.EqualsLiteral(kTextMime) || + mimeFlavor.EqualsLiteral(gTextPlainUTF8Type)) { + actualFlavor = kUnicodeMime; + needToDoConversionToPlainText = true; + } + // if someone was asking for _NETSCAPE_URL we need to convert to + // plain text but we also need to look for x-moz-url + else if (mimeFlavor.EqualsLiteral(gMozUrlType)) { + actualFlavor = kURLMime; + needToDoConversionToPlainText = true; + } + // if someone was asking for text/uri-list we need to convert to + // plain text. + else if (mimeFlavor.EqualsLiteral(gTextUriListType)) { + actualFlavor = gTextUriListType; + needToDoConversionToPlainText = true; + } + // Someone is asking for the special Direct Save Protocol type. + else if (mimeFlavor.EqualsLiteral(gXdndDirectSaveType)) { + // Indicate failure by default. + gtk_selection_data_set(aSelectionData, target, 8, (guchar*)"E", 1); + + GdkAtom property = gdk_atom_intern(gXdndDirectSaveType, FALSE); + GdkAtom type = gdk_atom_intern(kTextMime, FALSE); + + guchar* data; + gint length; + if (!gdk_property_get(gdk_drag_context_get_source_window(aContext), + property, type, 0, INT32_MAX, FALSE, nullptr, + nullptr, &length, &data)) { + return; + } + + // Zero-terminate the string. + data = (guchar*)g_realloc(data, length + 1); + if (!data) return; + data[length] = '\0'; + + gchar* hostname; + char* gfullpath = + g_filename_from_uri((const gchar*)data, &hostname, nullptr); + g_free(data); + if (!gfullpath) return; + + nsCString fullpath(gfullpath); + g_free(gfullpath); + + MOZ_LOG(sDragLm, LogLevel::Debug, + ("XdndDirectSave filepath is %s\n", fullpath.get())); + + // If there is no hostname in the URI, NULL will be stored. + // We should not accept uris with from a different host. + if (hostname) { + nsCOMPtr<nsIPropertyBag2> infoService = + do_GetService(NS_SYSTEMINFO_CONTRACTID); + if (!infoService) return; + + nsAutoCString host; + if (NS_SUCCEEDED( + infoService->GetPropertyAsACString(u"host"_ns, host))) { + if (!host.Equals(hostname)) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("ignored drag because of different host.\n")); + + // Special error code "F" for this case. + gtk_selection_data_set(aSelectionData, target, 8, (guchar*)"F", 1); + g_free(hostname); + return; + } + } + + g_free(hostname); + } + + nsCOMPtr<nsIFile> file; + if (NS_FAILED( + NS_NewNativeLocalFile(fullpath, false, getter_AddRefs(file)))) { + return; + } + + // We have to split the path into a directory and filename, + // because our internal file-promise API is based on these. + + nsCOMPtr<nsIFile> directory; + file->GetParent(getter_AddRefs(directory)); + + item->SetTransferData(kFilePromiseDirectoryMime, directory); + + nsCOMPtr<nsISupportsString> filenamePrimitive = + do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID); + if (!filenamePrimitive) return; + + nsAutoString leafName; + file->GetLeafName(leafName); + filenamePrimitive->SetData(leafName); + + item->SetTransferData(kFilePromiseDestFilename, filenamePrimitive); + + // Request a different type in GetTransferData. + actualFlavor = kFilePromiseMime; + } else { + actualFlavor = typeName; + } + nsresult rv; + nsCOMPtr<nsISupports> data; + rv = item->GetTransferData(actualFlavor, getter_AddRefs(data)); + + if (strcmp(actualFlavor, kFilePromiseMime) == 0) { + if (NS_SUCCEEDED(rv)) { + // Indicate success. + gtk_selection_data_set(aSelectionData, target, 8, (guchar*)"S", 1); + } + return; + } + + if (NS_SUCCEEDED(rv)) { + void* tmpData = nullptr; + uint32_t tmpDataLen = 0; + nsPrimitiveHelpers::CreateDataFromPrimitive( + nsDependentCString(actualFlavor), data, &tmpData, &tmpDataLen); + // if required, do the extra work to convert unicode to plain + // text and replace the output values with the plain text. + if (needToDoConversionToPlainText) { + char* plainTextData = nullptr; + char16_t* castedUnicode = reinterpret_cast<char16_t*>(tmpData); + uint32_t plainTextLen = 0; + UTF16ToNewUTF8(castedUnicode, tmpDataLen / 2, &plainTextData, + &plainTextLen); + if (tmpData) { + // this was not allocated using glib + free(tmpData); + tmpData = plainTextData; + tmpDataLen = plainTextLen; + } + } + if (tmpData) { + // this copies the data + gtk_selection_data_set(aSelectionData, target, 8, (guchar*)tmpData, + tmpDataLen); + // this wasn't allocated with glib + free(tmpData); + } + } else { + if (mimeFlavor.EqualsLiteral(gTextUriListType)) { + // fall back for text/uri-list + nsAutoCString list; + CreateURIList(mSourceDataItems, list); + gtk_selection_data_set(aSelectionData, target, 8, (guchar*)list.get(), + list.Length()); + return; + } + } + } +} + +void nsDragService::SourceBeginDrag(GdkDragContext* aContext) { + nsCOMPtr<nsITransferable> transferable = + do_QueryElementAt(mSourceDataItems, 0); + if (!transferable) return; + + nsTArray<nsCString> flavors; + nsresult rv = transferable->FlavorsTransferableCanImport(flavors); + NS_ENSURE_SUCCESS(rv, ); + + for (uint32_t i = 0; i < flavors.Length(); ++i) { + if (flavors[i].EqualsLiteral(kFilePromiseDestFilename)) { + nsCOMPtr<nsISupports> data; + rv = transferable->GetTransferData(kFilePromiseDestFilename, + getter_AddRefs(data)); + if (NS_FAILED(rv)) { + return; + } + + nsCOMPtr<nsISupportsString> fileName = do_QueryInterface(data); + if (!fileName) { + return; + } + + nsAutoString fileNameStr; + fileName->GetData(fileNameStr); + + nsCString fileNameCStr; + CopyUTF16toUTF8(fileNameStr, fileNameCStr); + + GdkAtom property = gdk_atom_intern(gXdndDirectSaveType, FALSE); + GdkAtom type = gdk_atom_intern(kTextMime, FALSE); + + gdk_property_change(gdk_drag_context_get_source_window(aContext), + property, type, 8, GDK_PROP_MODE_REPLACE, + (const guchar*)fileNameCStr.get(), + fileNameCStr.Length()); + } + } +} + +void nsDragService::SetDragIcon(GdkDragContext* aContext) { + if (!mHasImage && !mSelection) return; + + LayoutDeviceIntRect dragRect; + nsPresContext* pc; + RefPtr<SourceSurface> surface; + DrawDrag(mSourceNode, mRegion, mScreenPosition, &dragRect, &surface, &pc); + if (!pc) return; + + LayoutDeviceIntPoint screenPoint = + ConvertToUnscaledDevPixels(pc, mScreenPosition); + int32_t offsetX = screenPoint.x - dragRect.x; + int32_t offsetY = screenPoint.y - dragRect.y; + + // If a popup is set as the drag image, use its widget. Otherwise, use + // the surface that DrawDrag created. + // + // XXX: Disable drag popups on GTK 3.19.4 and above: see bug 1264454. + // Fix this once a new GTK version ships that does not destroy our + // widget in gtk_drag_set_icon_widget. + if (mDragPopup && gtk_check_version(3, 19, 4)) { + GtkWidget* gtkWidget = nullptr; + nsIFrame* frame = mDragPopup->GetPrimaryFrame(); + if (frame) { + // DrawDrag ensured that this is a popup frame. + nsCOMPtr<nsIWidget> widget = frame->GetNearestWidget(); + if (widget) { + gtkWidget = (GtkWidget*)widget->GetNativeData(NS_NATIVE_SHELLWIDGET); + if (gtkWidget) { + OpenDragPopup(); + gtk_drag_set_icon_widget(aContext, gtkWidget, offsetX, offsetY); + } + } + } + } else if (surface) { + if (!SetAlphaPixmap(surface, aContext, offsetX, offsetY, dragRect)) { + GdkPixbuf* dragPixbuf = nsImageToPixbuf::SourceSurfaceToPixbuf( + surface, dragRect.width, dragRect.height); + if (dragPixbuf) { + gtk_drag_set_icon_pixbuf(aContext, dragPixbuf, offsetX, offsetY); + g_object_unref(dragPixbuf); + } + } + } +} + +static void invisibleSourceDragBegin(GtkWidget* aWidget, + GdkDragContext* aContext, gpointer aData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragBegin")); + nsDragService* dragService = (nsDragService*)aData; + + dragService->SourceBeginDrag(aContext); + dragService->SetDragIcon(aContext); +} + +static void invisibleSourceDragDataGet(GtkWidget* aWidget, + GdkDragContext* aContext, + GtkSelectionData* aSelectionData, + guint aInfo, guint32 aTime, + gpointer aData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragDataGet")); + nsDragService* dragService = (nsDragService*)aData; + dragService->SourceDataGet(aWidget, aContext, aSelectionData, aTime); +} + +static gboolean invisibleSourceDragFailed(GtkWidget* aWidget, + GdkDragContext* aContext, + gint aResult, gpointer aData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragFailed %i", aResult)); + nsDragService* dragService = (nsDragService*)aData; + // End the drag session now (rather than waiting for the drag-end signal) + // so that operations performed on dropEffect == none can start immediately + // rather than waiting for the drag-failed animation to finish. + dragService->SourceEndDragSession(aContext, aResult); + + // We should return TRUE to disable the drag-failed animation iff the + // source performed an operation when dropEffect was none, but the handler + // of the dragend DOM event doesn't provide this information. + return FALSE; +} + +static void invisibleSourceDragEnd(GtkWidget* aWidget, GdkDragContext* aContext, + gpointer aData) { + MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragEnd")); + nsDragService* dragService = (nsDragService*)aData; + + // The drag has ended. Release the hostages! + dragService->SourceEndDragSession(aContext, MOZ_GTK_DRAG_RESULT_SUCCESS); +} + +// The following methods handle responding to GTK drag signals and +// tracking state between these signals. +// +// In general, GTK does not expect us to run the event loop while handling its +// drag signals, however our drag event handlers may run the +// event loop, most often to fetch information about the drag data. +// +// GTK, for example, uses the return value from drag-motion signals to +// determine whether drag-leave signals should be sent. If an event loop is +// run during drag-motion the XdndLeave message can get processed but when GTK +// receives the message it does not yet know that it needs to send the +// drag-leave signal to our widget. +// +// After a drag-drop signal, we need to reply with gtk_drag_finish(). +// However, gtk_drag_finish should happen after the drag-drop signal handler +// returns so that when the Motif drag protocol is used, the +// XmTRANSFER_SUCCESS during gtk_drag_finish is sent after the XmDROP_START +// reply sent on return from the drag-drop signal handler. +// +// Similarly drag-end for a successful drag and drag-failed are not good +// times to run a nested event loop as gtk_drag_drop_finished() and +// gtk_drag_source_info_destroy() don't gtk_drag_clear_source_info() or remove +// drop_timeout until after at least the first of these signals is sent. +// Processing other events (e.g. a slow GDK_DROP_FINISHED reply, or the drop +// timeout) could cause gtk_drag_drop_finished to be called again with the +// same GtkDragSourceInfo, which won't like being destroyed twice. +// +// Therefore we reply to the signals immediately and schedule a task to +// dispatch the Gecko events, which may run the event loop. +// +// Action in response to drag-leave signals is also delayed until the event +// loop runs again so that we find out whether a drag-drop signal follows. +// +// A single task is scheduled to manage responses to all three GTK signals. +// If further signals are received while the task is scheduled, the scheduled +// response is updated, sometimes effectively compressing successive signals. +// +// No Gecko drag events are dispatched (during nested event loops) while other +// Gecko drag events are in flight. This helps event handlers that may not +// expect nested events, while accessing an event's dataTransfer for example. + +gboolean nsDragService::ScheduleMotionEvent( + nsWindow* aWindow, GdkDragContext* aDragContext, + nsWaylandDragContext* aWaylandDragContext, + LayoutDeviceIntPoint aWindowPoint, guint aTime) { + if (aDragContext && mScheduledTask == eDragTaskMotion) { + // The drag source has sent another motion message before we've + // replied to the previous. That shouldn't happen with Xdnd. The + // spec for Motif drags is less clear, but we'll just update the + // scheduled task with the new position reply only to the most + // recent message. + NS_WARNING("Drag Motion message received before previous reply was sent"); + } + + // Returning TRUE means we'll reply with a status message, unless we first + // get a leave. + return Schedule(eDragTaskMotion, aWindow, aDragContext, aWaylandDragContext, + aWindowPoint, aTime); +} + +void nsDragService::ScheduleLeaveEvent() { + // We don't know at this stage whether a drop signal will immediately + // follow. If the drop signal gets sent it will happen before we return + // to the main loop and the scheduled leave task will be replaced. + if (!Schedule(eDragTaskLeave, nullptr, nullptr, nullptr, + LayoutDeviceIntPoint(), 0)) { + NS_WARNING("Drag leave after drop"); + } +} + +gboolean nsDragService::ScheduleDropEvent( + nsWindow* aWindow, GdkDragContext* aDragContext, + nsWaylandDragContext* aWaylandDragContext, + LayoutDeviceIntPoint aWindowPoint, guint aTime) { + if (!Schedule(eDragTaskDrop, aWindow, aDragContext, aWaylandDragContext, + aWindowPoint, aTime)) { + NS_WARNING("Additional drag drop ignored"); + return FALSE; + } + + SetDragEndPoint(aWindowPoint + aWindow->WidgetToScreenOffset()); + + // We'll reply with gtk_drag_finish(). + return TRUE; +} + +gboolean nsDragService::Schedule(DragTask aTask, nsWindow* aWindow, + GdkDragContext* aDragContext, + nsWaylandDragContext* aWaylandDragContext, + LayoutDeviceIntPoint aWindowPoint, + guint aTime) { + // If there is an existing leave or motion task scheduled, then that + // will be replaced. When the new task is run, it will dispatch + // any necessary leave or motion events. + + // If aTask is eDragTaskSourceEnd, then it will replace even a scheduled + // drop event (which could happen if the drop event has not been processed + // within the allowed time). Otherwise, if we haven't yet run a scheduled + // drop or end task, just say that we are not ready to receive another + // drop. + if (mScheduledTask == eDragTaskSourceEnd || + (mScheduledTask == eDragTaskDrop && aTask != eDragTaskSourceEnd)) + return FALSE; + + mScheduledTask = aTask; + mPendingWindow = aWindow; + mPendingDragContext = aDragContext; +#ifdef MOZ_WAYLAND + mPendingWaylandDragContext = aWaylandDragContext; +#endif + mPendingWindowPoint = aWindowPoint; + mPendingTime = aTime; + + if (!mTaskSource) { + // High priority is used here because the native events involved have + // already waited at default priority. Perhaps a lower than default + // priority could be used for motion tasks because there is a chance + // that a leave or drop is waiting, but managing different priorities + // may not be worth the effort. Motion tasks shouldn't queue up as + // they should be throttled based on replies. + mTaskSource = + g_idle_add_full(G_PRIORITY_HIGH, TaskDispatchCallback, this, nullptr); + } + return TRUE; +} + +gboolean nsDragService::TaskDispatchCallback(gpointer data) { + RefPtr<nsDragService> dragService = static_cast<nsDragService*>(data); + return dragService->RunScheduledTask(); +} + +gboolean nsDragService::RunScheduledTask() { + if (mTargetWindow && mTargetWindow != mPendingWindow) { + MOZ_LOG(sDragLm, LogLevel::Debug, + ("nsDragService: dispatch drag leave (%p)\n", mTargetWindow.get())); + mTargetWindow->DispatchDragEvent(eDragExit, mTargetWindowPoint, 0); + + if (!mSourceNode) { + // The drag that was initiated in a different app. End the drag + // session, since we're done with it for now (until the user drags + // back into this app). + EndDragSession(false, GetCurrentModifiers()); + } + } + + // It is possible that the pending state has been updated during dispatch + // of the leave event. That's fine. + + // Now we collect the pending state because, from this point on, we want + // to use the same state for all events dispatched. All state is updated + // so that when other tasks are scheduled during dispatch here, this + // task is considered to have already been run. + bool positionHasChanged = mPendingWindow != mTargetWindow || + mPendingWindowPoint != mTargetWindowPoint; + DragTask task = mScheduledTask; + mScheduledTask = eDragTaskNone; + mTargetWindow = std::move(mPendingWindow); + mTargetWindowPoint = mPendingWindowPoint; + + if (task == eDragTaskLeave || task == eDragTaskSourceEnd) { + if (task == eDragTaskSourceEnd) { + // Dispatch drag end events. + EndDragSession(true, GetCurrentModifiers()); + } + + // Nothing more to do + // Returning false removes the task source from the event loop. + mTaskSource = 0; + return FALSE; + } + + // This may be the start of a destination drag session. + StartDragSession(); + + // mTargetWidget may be nullptr if the window has been destroyed. + // (The leave event is not scheduled if a drop task is still scheduled.) + // We still reply appropriately to indicate that the drop will or didn't + // succeeed. + mTargetWidget = mTargetWindow->GetMozContainerWidget(); + mTargetDragContext = std::move(mPendingDragContext); +#ifdef MOZ_WAYLAND + mTargetWaylandDragContext = std::move(mPendingWaylandDragContext); +#endif + mTargetTime = mPendingTime; + + mCachedData.Clear(); + + // http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#drag-and-drop-processing-model + // (as at 27 December 2010) indicates that a "drop" event should only be + // fired (at the current target element) if the current drag operation is + // not none. The current drag operation will only be set to a non-none + // value during a "dragover" event. + // + // If the user has ended the drag before any dragover events have been + // sent, then the spec recommends skipping the drop (because the current + // drag operation is none). However, here we assume that, by releasing + // the mouse button, the user has indicated that they want to drop, so we + // proceed with the drop where possible. + // + // In order to make the events appear to content in the same way as if the + // spec is being followed we make sure to dispatch a "dragover" event with + // appropriate coordinates and check canDrop before the "drop" event. + // + // When the Xdnd protocol is used for source/destination communication (as + // should be the case with GTK source applications) a dragover event + // should have already been sent during the drag-motion signal, which + // would have already been received because XdndDrop messages do not + // contain a position. However, we can't assume the same when the Motif + // protocol is used. + if (task == eDragTaskMotion || positionHasChanged) { + UpdateDragAction(); + TakeDragEventDispatchedToChildProcess(); // Clear the old value. + DispatchMotionEvents(); + if (task == eDragTaskMotion) { + if (TakeDragEventDispatchedToChildProcess()) { + mTargetDragContextForRemote = mTargetDragContext; +#ifdef MOZ_WAYLAND + mTargetWaylandDragContextForRemote = mTargetWaylandDragContext; +#endif + } else { + // Reply to tell the source whether we can drop and what + // action would be taken. + if (mTargetDragContext) { + ReplyToDragMotion(mTargetDragContext); + } +#ifdef MOZ_WAYLAND + else if (mTargetWaylandDragContext) { + ReplyToDragMotion(mTargetWaylandDragContext); + } +#endif + } + } + } + + if (task == eDragTaskDrop) { + gboolean success = DispatchDropEvent(); + + // Perhaps we should set the del parameter to TRUE when the drag + // action is move, but we don't know whether the data was successfully + // transferred. + if (mTargetDragContext) { + gtk_drag_finish(mTargetDragContext, success, + /* del = */ FALSE, mTargetTime); + } + + // This drag is over, so clear out our reference to the previous + // window. + mTargetWindow = nullptr; + // Make sure to end the drag session. If this drag started in a + // different app, we won't get a drag_end signal to end it from. + EndDragSession(true, GetCurrentModifiers()); + } + + // We're done with the drag context. + mTargetWidget = nullptr; + mTargetDragContext = nullptr; +#ifdef MOZ_WAYLAND + mTargetWaylandDragContext = nullptr; +#endif + + mCachedData.Clear(); + + // If we got another drag signal while running the sheduled task, that + // must have happened while running a nested event loop. Leave the task + // source on the event loop. + if (mScheduledTask != eDragTaskNone) return TRUE; + + // We have no task scheduled. + // Returning false removes the task source from the event loop. + mTaskSource = 0; + return FALSE; +} + +// This will update the drag action based on the information in the +// drag context. Gtk gets this from a combination of the key settings +// and what the source is offering. + +void nsDragService::UpdateDragAction() { + // This doesn't look right. dragSession.dragAction is used by + // nsContentUtils::SetDataTransferInEvent() to set the initial + // dataTransfer.dropEffect, so GdkDragContext::suggested_action would be + // more appropriate. GdkDragContext::actions should be used to set + // dataTransfer.effectAllowed, which doesn't currently happen with + // external sources. + + // default is to do nothing + int action = nsIDragService::DRAGDROP_ACTION_NONE; + GdkDragAction gdkAction = GDK_ACTION_DEFAULT; + if (mTargetDragContext) { + gdkAction = gdk_drag_context_get_actions(mTargetDragContext); + } +#ifdef MOZ_WAYLAND + else if (mTargetWaylandDragContext) { + gdkAction = mTargetWaylandDragContext->GetAvailableDragActions(); + } +#endif + + // set the default just in case nothing matches below + if (gdkAction & GDK_ACTION_DEFAULT) + action = nsIDragService::DRAGDROP_ACTION_MOVE; + + // first check to see if move is set + if (gdkAction & GDK_ACTION_MOVE) + action = nsIDragService::DRAGDROP_ACTION_MOVE; + + // then fall to the others + else if (gdkAction & GDK_ACTION_LINK) + action = nsIDragService::DRAGDROP_ACTION_LINK; + + // copy is ctrl + else if (gdkAction & GDK_ACTION_COPY) + action = nsIDragService::DRAGDROP_ACTION_COPY; + + // update the drag information + SetDragAction(action); +} + +NS_IMETHODIMP +nsDragService::UpdateDragEffect() { + if (mTargetDragContextForRemote) { + ReplyToDragMotion(mTargetDragContextForRemote); + mTargetDragContextForRemote = nullptr; + } +#ifdef MOZ_WAYLAND + else if (mTargetWaylandDragContextForRemote) { + ReplyToDragMotion(mTargetWaylandDragContextForRemote); + mTargetWaylandDragContextForRemote = nullptr; + } +#endif + return NS_OK; +} + +void nsDragService::DispatchMotionEvents() { + mCanDrop = false; + + FireDragEventAtSource(eDrag, GetCurrentModifiers()); + + mTargetWindow->DispatchDragEvent(eDragOver, mTargetWindowPoint, mTargetTime); +} + +// Returns true if the drop was successful +gboolean nsDragService::DispatchDropEvent() { + // We need to check IsDestroyed here because the nsRefPtr + // only protects this from being deleted, it does NOT protect + // against nsView::~nsView() calling Destroy() on it, bug 378273. + if (mTargetWindow->IsDestroyed()) return FALSE; + + EventMessage msg = mCanDrop ? eDrop : eDragExit; + + mTargetWindow->DispatchDragEvent(msg, mTargetWindowPoint, mTargetTime); + + return mCanDrop; +} + +/* static */ +uint32_t nsDragService::GetCurrentModifiers() { + return mozilla::widget::KeymapWrapper::ComputeCurrentKeyModifiers(); +} |