Upstream version 7.35.144.0
[platform/framework/web/crosswalk.git] / src / chrome / browser / ui / gtk / custom_drag.h
1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef CHROME_BROWSER_UI_GTK_CUSTOM_DRAG_H_
6 #define CHROME_BROWSER_UI_GTK_CUSTOM_DRAG_H_
7
8 #include <gtk/gtk.h>
9
10 #include "base/basictypes.h"
11 #include "ui/base/gtk/gtk_signal.h"
12
13 namespace gfx {
14 class Image;
15 }
16
17 // Base class for programatically generated drags.
18 class CustomDrag {
19  protected:
20   CustomDrag(gfx::Image* icon, int code_mask, GdkDragAction action);
21   virtual ~CustomDrag();
22
23   virtual void OnDragDataGet(GtkWidget* widget,
24                              GdkDragContext* context,
25                              GtkSelectionData* selection_data,
26                              guint target_type,
27                              guint time) = 0;
28
29  private:
30   CHROMEGTK_CALLBACK_1(CustomDrag, void, OnDragBegin, GdkDragContext*);
31   CHROMEGTK_CALLBACK_1(CustomDrag, void, OnDragEnd, GdkDragContext*);
32
33   // Since this uses a virtual function, we can't use a macro.
34   static void OnDragDataGetThunk(GtkWidget* widget, GdkDragContext* context,
35                                  GtkSelectionData* selection_data,
36                                  guint target_type, guint time,
37                                  CustomDrag* custom_drag) {
38     return custom_drag->OnDragDataGet(widget, context, selection_data,
39                                       target_type, time);
40   }
41
42   // Can't use a OwnedWidgetGtk because the initialization of GtkInvisible
43   // sinks the reference.
44   GtkWidget* drag_widget_;
45
46   // The image for the drag. The lifetime of the image should be managed outside
47   // this object. Most icons are owned by the IconManager.
48   gfx::Image* image_;
49
50   DISALLOW_COPY_AND_ASSIGN(CustomDrag);
51 };
52
53 #endif  // CHROME_BROWSER_UI_GTK_CUSTOM_DRAG_H_