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_ 54
