gtk: Split CustomDrag into multiple pieces.

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

+// 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.
+
+#include "chrome/browser/ui/gtk/bookmarks/bookmark_drag.h"
+
+#include "chrome/browser/ui/gtk/bookmarks/bookmark_utils_gtk.h"
+
+namespace {
+
+const GdkDragAction kBookmarkDragAction =
+    static_cast<GdkDragAction>(GDK_ACTION_COPY | GDK_ACTION_MOVE);
+
+}  // namespace
+
+// static
+void BookmarkDrag::BeginDrag(Profile* profile,
+                             const std::vector<const BookmarkNode*>& nodes) {
+  new BookmarkDrag(profile, nodes);
+}
+
+BookmarkDrag::BookmarkDrag(Profile* profile,
+                           const std::vector<const BookmarkNode*>& nodes)
+    : CustomDrag(NULL, GetCodeMask(false), kBookmarkDragAction),
+      profile_(profile),
+      nodes_(nodes) {}
+
+BookmarkDrag::~BookmarkDrag() {}
+
+void BookmarkDrag::OnDragDataGet(GtkWidget* widget,
+                                 GdkDragContext* context,
+                                 GtkSelectionData* selection_data,
+                                 guint target_type,
+                                 guint time) {
+  WriteBookmarksToSelection(nodes_, selection_data, target_type, profile_);
+}