static void
gcal_event_widget_drag_begin (GtkWidget *widget,
GdkDragContext *context)
{
GcalEventWidget *self;
cairo_surface_t *surface;
GdkWindow *window;
GdkDevice *device;
gint x, y;
GtkAllocation allocation;
self = GCAL_EVENT_WIDGET (widget);
window = gtk_widget_get_window (widget);
device = gdk_drag_context_get_device (context);
if (self->read_only)
{
gtk_drag_cancel (context);
return;
}
/* Setup the drag n' drop icon */
surface = get_dnd_icon (widget);
gtk_drag_set_icon_surface (context, surface);
/* reposition drag surface to the point the GCalEvent was */
gtk_widget_get_allocation (widget, &allocation);
gdk_window_get_device_position (window, device, &x, &y, NULL);
gdk_drag_context_set_hotspot (context, x - allocation.x, y - allocation.y);
g_clear_pointer (&surface, cairo_surface_destroy);
}
void DragAndDropHandler::startDrag(Ref<SelectionData>&& selection, DragOperation dragOperation, RefPtr<ShareableBitmap>&& dragImage)
{
#if GTK_CHECK_VERSION(3, 16, 0)
m_draggingSelectionData = WTFMove(selection);
GRefPtr<GtkTargetList> targetList = PasteboardHelper::singleton().targetListForSelectionData(*m_draggingSelectionData);
#else
RefPtr<SelectionData> selectionData = WTFMove(selection);
GRefPtr<GtkTargetList> targetList = PasteboardHelper::singleton().targetListForSelectionData(*selectionData);
#endif
GUniquePtr<GdkEvent> currentEvent(gtk_get_current_event());
GdkDragContext* context = gtk_drag_begin(m_page.viewWidget(), targetList.get(), dragOperationToGdkDragActions(dragOperation),
GDK_BUTTON_PRIMARY, currentEvent.get());
#if GTK_CHECK_VERSION(3, 16, 0)
// WebCore::EventHandler does not support more than one DnD operation at the same time for
// a given page, so we should cancel any previous operation whose context we might have
// stored, should we receive a new startDrag event before finishing a previous DnD operation.
if (m_dragContext)
gtk_drag_cancel(m_dragContext.get());
m_dragContext = context;
#else
// We don't have gtk_drag_cancel() in GTK+ < 3.16, so we use the old code.
// See https://bugs.webkit.org/show_bug.cgi?id=138468
m_draggingSelectionDataMap.set(context, WTFMove(selectionData));
#endif
if (dragImage) {
RefPtr<cairo_surface_t> image(dragImage->createCairoSurface());
// Use the center of the drag image as hotspot.
cairo_surface_set_device_offset(image.get(), -cairo_image_surface_get_width(image.get()) / 2, -cairo_image_surface_get_height(image.get()) / 2);
gtk_drag_set_icon_surface(context, image.get());
} else
gtk_drag_set_icon_default(context);
}
