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_