Implement dragging icon for dragging bookmarks in views/gtk.

views/widget/widget_gtk.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "views/widget/widget_gtk.h"
 
 #include "app/drag_drop_types.h"
 #include "app/gfx/path.h"
 #include "app/os_exchange_data.h"
 #include "app/os_exchange_data_provider_gtk.h"
@@ skipping 166 matching lines @@
   gtk_widget_set_size_request(child, w, h);
   gtk_fixed_move(GTK_FIXED(window_contents_), child, x, y);
 }
 
 void WidgetGtk::DoDrag(const OSExchangeData& data, int operation) {
   const OSExchangeDataProviderGtk& data_provider =
       static_cast<const OSExchangeDataProviderGtk&>(data.provider());
   GtkTargetList* targets = data_provider.GetTargetList();
   GdkEvent* current_event = gtk_get_current_event();
   DCHECK(current_event);
-  gtk_drag_begin(window_contents_, targets,
-                 static_cast<GdkDragAction>(
-                     DragDropTypes::DragOperationToGdkDragAction(operation)),
-                 1, current_event);
+  const OSExchangeDataProviderGtk& provider(
+      static_cast<const OSExchangeDataProviderGtk&>(data.provider()));
+
+  GdkDragContext* context = gtk_drag_begin(
+      window_contents_,
+      targets,
+      static_cast<GdkDragAction>(
+          DragDropTypes::DragOperationToGdkDragAction(operation)),
+      1,
+      current_event);
+
+  // Set the drag image if one was supplied.
+  if (provider.get_drag_image())
+    gtk_drag_set_icon_pixbuf(context,
+                             provider.get_drag_image(),
+                             provider.cursor_offset_x(),
+                             provider.cursor_offset_y());
   gdk_event_free(current_event);
   gtk_target_list_unref(targets);
 
   drag_data_ = &data_provider;
 
   // Block the caller until drag is done by running a nested message loop.
   MessageLoopForUI::current()->Run(NULL);
 
   drag_data_ = NULL;
 }
@@ skipping 995 matching lines @@
 
 // static
 Widget* Widget::CreateTransparentPopupWidget(bool delete_on_destroy) {
   WidgetGtk* popup = new WidgetGtk(WidgetGtk::TYPE_POPUP);
   popup->set_delete_on_destroy(delete_on_destroy);
   popup->MakeTransparent();
   return popup;
 }
 
 }  // namespace views