Implement dragging icon for dragging bookmarks in views/gtk.

app/os_exchange_data_provider_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 "app/os_exchange_data_provider_gtk.h"
 
 #include <algorithm>
 
 #include "app/gtk_dnd_util.h"
 #include "base/file_path.h"
 #include "base/string_util.h"
 #include "net/base/net_util.h"
 
 OSExchangeDataProviderGtk::OSExchangeDataProviderGtk(
     int known_formats,
     const std::set<GdkAtom>& known_custom_formats)
     : known_formats_(known_formats),
       known_custom_formats_(known_custom_formats),
-      formats_(0) {
+      formats_(0),
+      drag_image_(NULL),
+      cursor_offset_x_(0),
+      cursor_offset_y_(0) {
 }
 
 OSExchangeDataProviderGtk::OSExchangeDataProviderGtk()
     : known_formats_(0),
-      formats_(0) {
+      formats_(0),
+      drag_image_(NULL),
+      cursor_offset_x_(0),
+      cursor_offset_y_(0) {
 }
 
 OSExchangeDataProviderGtk::~OSExchangeDataProviderGtk() {
+  if (drag_image_)
+    g_object_unref(drag_image_);
 }
 
 bool OSExchangeDataProviderGtk::HasDataForAllFormats(
     int formats,
     const std::set<GdkAtom>& custom_formats) const {
   if ((formats_ & formats) != formats)
     return false;
   for (std::set<GdkAtom>::iterator i = custom_formats.begin();
        i != custom_formats.end(); ++i) {
     if (pickle_data_.find(*i) == pickle_data_.end())
@@ skipping 173 matching lines @@
 
   GURL test_url(string_);
   if (!test_url.is_valid())
     return false;
 
   if (url)
     *url = test_url;
   return true;
 }
 
+void OSExchangeDataProviderGtk::SetDragImage(GdkPixbuf* drag_image,
+                                             int cursor_offset_x,
+                                             int cursor_offset_y) {
+  if (drag_image_)
+    g_object_unref(drag_image_);
+  g_object_ref(drag_image);
+  drag_image_ = drag_image;
+  cursor_offset_x_ = cursor_offset_x;
+  cursor_offset_y_ = cursor_offset_y;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // OSExchangeData, public:
 
 // static
 OSExchangeData::Provider* OSExchangeData::CreateProvider() {
   return new OSExchangeDataProviderGtk();
 }
 
 GdkAtom OSExchangeData::RegisterCustomFormat(const std::string& type) {
   return gdk_atom_intern(type.c_str(), false);
 }