gtk: Split CustomDrag into multiple pieces.

chrome/browser/ui/gtk/bookmarks/bookmark_drag.h

+// Copyright 2013 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.
+
+#ifndef CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_DRAG_H_
+#define CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_DRAG_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/ui/gtk/custom_drag.h"
+
+class BookmarkNode;
+class Profile;
+
+// Encapsulates functionality for drags of one or more bookmarks.
+class BookmarkDrag : public CustomDrag {
+ public:
+  // Creates a new BookmarkDrag, the lifetime of which is tied to the system
+  // drag.
+  static void BeginDrag(Profile* profile,
+                        const std::vector<const BookmarkNode*>& nodes);
+
+ private:
+  BookmarkDrag(Profile* profile, const std::vector<const BookmarkNode*>& nodes);
+  virtual ~BookmarkDrag();
+
+  virtual void OnDragDataGet(GtkWidget* widget,
+                             GdkDragContext* context,
+                             GtkSelectionData* selection_data,
+                             guint target_type,
+                             guint time) OVERRIDE;
+
+  Profile* profile_;
+  std::vector<const BookmarkNode*> nodes_;
+
+  DISALLOW_COPY_AND_ASSIGN(BookmarkDrag);
+};
+
+#endif  // CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_DRAG_H_