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      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 #include <vector>
     10 
     11 #include "base/basictypes.h"
     12 #include "base/compiler_specific.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "ui/base/gtk/gtk_signal.h"
     15 
     16 class BookmarkNode;
     17 class Profile;
     18 
     19 namespace content {
     20 class DownloadItem;
     21 }
     22 
     23 namespace gfx {
     24 class Image;
     25 }
     26 
     27 // Base class for programatically generated drags.
     28 class CustomDrag {
     29  protected:
     30   CustomDrag(gfx::Image* icon, int code_mask, GdkDragAction action);
     31   virtual ~CustomDrag();
     32 
     33   virtual void OnDragDataGet(GtkWidget* widget, GdkDragContext* context,
     34                              GtkSelectionData* selection_data,
     35                              guint target_type, guint time) = 0;
     36 
     37  private:
     38   CHROMEGTK_CALLBACK_1(CustomDrag, void, OnDragBegin, GdkDragContext*);
     39   CHROMEGTK_CALLBACK_1(CustomDrag, void, OnDragEnd, GdkDragContext*);
     40 
     41   // Since this uses a virtual function, we can't use a macro.
     42   static void OnDragDataGetThunk(GtkWidget* widget, GdkDragContext* context,
     43                                  GtkSelectionData* selection_data,
     44                                  guint target_type, guint time,
     45                                  CustomDrag* custom_drag) {
     46     return custom_drag->OnDragDataGet(widget, context, selection_data,
     47                                       target_type, time);
     48   }
     49 
     50   // Can't use a OwnedWidgetGtk because the initialization of GtkInvisible
     51   // sinks the reference.
     52   GtkWidget* drag_widget_;
     53 
     54   // The image for the drag. The lifetime of the image should be managed outside
     55   // this object. Most icons are owned by the IconManager.
     56   gfx::Image* image_;
     57 
     58   DISALLOW_COPY_AND_ASSIGN(CustomDrag);
     59 };
     60 
     61 // Encapsulates functionality for drags of download items.
     62 class DownloadItemDrag : public CustomDrag {
     63  public:
     64   // Sets |widget| as a source for drags pertaining to |item|. No
     65   // DownloadItemDrag object is created.
     66   // It is safe to call this multiple times with different values of |icon|.
     67   static void SetSource(GtkWidget* widget,
     68                         const content::DownloadItem* item,
     69                         gfx::Image* icon);
     70 
     71   // Creates a new DownloadItemDrag, the lifetime of which is tied to the
     72   // system drag.
     73   static void BeginDrag(const content::DownloadItem* item, gfx::Image* icon);
     74 
     75  private:
     76   class DragData;
     77 
     78   DownloadItemDrag(const content::DownloadItem* item, gfx::Image* icon);
     79   virtual ~DownloadItemDrag();
     80 
     81   virtual void OnDragDataGet(GtkWidget* widget, GdkDragContext* context,
     82                              GtkSelectionData* selection_data,
     83                              guint target_type, guint time) OVERRIDE;
     84 
     85   scoped_ptr<DragData> drag_data_;
     86 
     87   DISALLOW_COPY_AND_ASSIGN(DownloadItemDrag);
     88 };
     89 
     90 // Encapsulates functionality for drags of one or more bookmarks.
     91 class BookmarkDrag : public CustomDrag {
     92  public:
     93   // Creates a new BookmarkDrag, the lifetime of which is tied to the
     94   // system drag.
     95   static void BeginDrag(Profile* profile,
     96                         const std::vector<const BookmarkNode*>& nodes);
     97 
     98  private:
     99   BookmarkDrag(Profile* profile,
    100                const std::vector<const BookmarkNode*>& nodes);
    101   virtual ~BookmarkDrag();
    102 
    103   virtual void OnDragDataGet(GtkWidget* widget, GdkDragContext* context,
    104                              GtkSelectionData* selection_data,
    105                              guint target_type, guint time) OVERRIDE;
    106 
    107   Profile* profile_;
    108   std::vector<const BookmarkNode*> nodes_;
    109 
    110   DISALLOW_COPY_AND_ASSIGN(BookmarkDrag);
    111 };
    112 
    113 #endif  // CHROME_BROWSER_UI_GTK_CUSTOM_DRAG_H_
    114