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 #pragma once 8 9 #include <gtk/gtk.h> 10 #include <vector> 11 12 #include "base/basictypes.h" 13 #include "ui/base/gtk/gtk_signal.h" 14 15 class BookmarkNode; 16 class DownloadItem; 17 class Profile; 18 19 namespace gfx { 20 class Image; 21 } 22 23 // Base class for programatically generated drags. 24 class CustomDrag { 25 protected: 26 explicit CustomDrag(gfx::Image* icon, int code_mask, GdkDragAction action); 27 virtual ~CustomDrag(); 28 29 virtual void OnDragDataGet(GtkWidget* widget, GdkDragContext* context, 30 GtkSelectionData* selection_data, 31 guint target_type, guint time) = 0; 32 33 private: 34 CHROMEGTK_CALLBACK_1(CustomDrag, void, OnDragBegin, GdkDragContext*); 35 CHROMEGTK_CALLBACK_1(CustomDrag, void, OnDragEnd, GdkDragContext*); 36 37 // Since this uses a virtual function, we can't use a macro. OnDragDataGetThunk(GtkWidget * widget,GdkDragContext * context,GtkSelectionData * selection_data,guint target_type,guint time,CustomDrag * custom_drag)38 static void OnDragDataGetThunk(GtkWidget* widget, GdkDragContext* context, 39 GtkSelectionData* selection_data, 40 guint target_type, guint time, 41 CustomDrag* custom_drag) { 42 return custom_drag->OnDragDataGet(widget, context, selection_data, 43 target_type, time); 44 } 45 46 // Can't use a OwnedWidgetGtk because the initialization of GtkInvisible 47 // sinks the reference. 48 GtkWidget* drag_widget_; 49 50 // The image for the drag. The lifetime of the image should be managed outside 51 // this object. Most icons are owned by the IconManager. 52 gfx::Image* image_; 53 54 DISALLOW_COPY_AND_ASSIGN(CustomDrag); 55 }; 56 57 // Encapsulates functionality for drags of download items. 58 class DownloadItemDrag : public CustomDrag { 59 public: 60 // Sets |widget| as a source for drags pertaining to |item|. No 61 // DownloadItemDrag object is created. 62 // It is safe to call this multiple times with different values of |icon|. 63 static void SetSource(GtkWidget* widget, 64 DownloadItem* item, 65 gfx::Image* icon); 66 67 // Creates a new DownloadItemDrag, the lifetime of which is tied to the 68 // system drag. 69 static void BeginDrag(const DownloadItem* item, gfx::Image* icon); 70 71 private: 72 DownloadItemDrag(const DownloadItem* item, gfx::Image* icon); 73 virtual ~DownloadItemDrag(); 74 75 virtual void OnDragDataGet(GtkWidget* widget, GdkDragContext* context, 76 GtkSelectionData* selection_data, 77 guint target_type, guint time); 78 79 const DownloadItem* download_item_; 80 81 DISALLOW_COPY_AND_ASSIGN(DownloadItemDrag); 82 }; 83 84 // Encapsulates functionality for drags of one or more bookmarks. 85 class BookmarkDrag : public CustomDrag { 86 public: 87 // Creates a new BookmarkDrag, the lifetime of which is tied to the 88 // system drag. 89 static void BeginDrag(Profile* profile, 90 const std::vector<const BookmarkNode*>& nodes); 91 92 private: 93 BookmarkDrag(Profile* profile, 94 const std::vector<const BookmarkNode*>& nodes); 95 virtual ~BookmarkDrag(); 96 97 virtual void OnDragDataGet(GtkWidget* widget, GdkDragContext* context, 98 GtkSelectionData* selection_data, 99 guint target_type, guint time); 100 101 Profile* profile_; 102 std::vector<const BookmarkNode*> nodes_; 103 104 DISALLOW_COPY_AND_ASSIGN(BookmarkDrag); 105 }; 106 107 #endif // CHROME_BROWSER_UI_GTK_CUSTOM_DRAG_H_ 108