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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_TAB_CONTENTS_DRAG_SOURCE_H_
      6 #define CHROME_BROWSER_UI_GTK_TAB_CONTENTS_DRAG_SOURCE_H_
      7 #pragma once
      8 
      9 #include <gtk/gtk.h>
     10 
     11 #include "base/basictypes.h"
     12 #include "base/file_path.h"
     13 #include "base/message_loop.h"
     14 #include "base/string16.h"
     15 #include "googleurl/src/gurl.h"
     16 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
     17 #include "ui/base/gtk/gtk_signal.h"
     18 #include "ui/base/gtk/gtk_signal_registrar.h"
     19 #include "ui/gfx/native_widget_types.h"
     20 #include "ui/gfx/point.h"
     21 
     22 class SkBitmap;
     23 class TabContents;
     24 class TabContentsView;
     25 struct WebDropData;
     26 
     27 // TabContentsDragSource takes care of managing the drag from a TabContents
     28 // with Gtk.
     29 class TabContentsDragSource : public MessageLoopForUI::Observer {
     30  public:
     31   explicit TabContentsDragSource(TabContentsView* tab_contents_view);
     32   ~TabContentsDragSource();
     33 
     34   TabContents* tab_contents() const;
     35 
     36   // Starts a drag for the tab contents this TabContentsDragSource was
     37   // created for.
     38   void StartDragging(const WebDropData& drop_data,
     39                      WebKit::WebDragOperationsMask allowed_ops,
     40                      GdkEventButton* last_mouse_down,
     41                      const SkBitmap& image,
     42                      const gfx::Point& image_offset);
     43 
     44   // MessageLoop::Observer implementation:
     45   virtual void WillProcessEvent(GdkEvent* event);
     46   virtual void DidProcessEvent(GdkEvent* event);
     47 
     48  private:
     49   CHROMEGTK_CALLBACK_2(TabContentsDragSource, gboolean, OnDragFailed,
     50                        GdkDragContext*, GtkDragResult);
     51   CHROMEGTK_CALLBACK_1(TabContentsDragSource, void, OnDragBegin,
     52                        GdkDragContext*);
     53   CHROMEGTK_CALLBACK_1(TabContentsDragSource, void, OnDragEnd,
     54                        GdkDragContext*);
     55   CHROMEGTK_CALLBACK_4(TabContentsDragSource, void, OnDragDataGet,
     56                        GdkDragContext*, GtkSelectionData*, guint, guint);
     57   CHROMEGTK_CALLBACK_1(TabContentsDragSource, gboolean, OnDragIconExpose,
     58                        GdkEventExpose*);
     59 
     60   gfx::NativeView GetContentNativeView() const;
     61 
     62   // The view we're manging the drag for.
     63   TabContentsView* tab_contents_view_;
     64 
     65   // The drop data for the current drag (for drags that originate in the render
     66   // view). Non-NULL iff there is a current drag.
     67   scoped_ptr<WebDropData> drop_data_;
     68 
     69   // The image used for depicting the drag, and the offset between the cursor
     70   // and the top left pixel.
     71   GdkPixbuf* drag_pixbuf_;
     72   gfx::Point image_offset_;
     73 
     74   // The mime type for the file contents of the current drag (if any).
     75   GdkAtom drag_file_mime_type_;
     76 
     77   // Whether the current drag has failed. Meaningless if we are not the source
     78   // for a current drag.
     79   bool drag_failed_;
     80 
     81   // This is the widget we use to initiate drags. Since we don't use the
     82   // renderer widget, we can persist drags even when our contents is switched
     83   // out. We can't use an OwnedWidgetGtk because the GtkInvisible widget
     84   // initialization code sinks the reference.
     85   GtkWidget* drag_widget_;
     86 
     87   // Context created once drag starts.  A NULL value indicates that there is
     88   // no drag currently in progress.
     89   GdkDragContext* drag_context_;
     90 
     91   // The file mime type for a drag-out download.
     92   string16 wide_download_mime_type_;
     93 
     94   // The file name to be saved to for a drag-out download.
     95   FilePath download_file_name_;
     96 
     97   // The URL to download from for a drag-out download.
     98   GURL download_url_;
     99 
    100   // The widget that provides visual feedback for the drag. We can't use
    101   // an OwnedWidgetGtk because the GtkWindow initialization code sinks
    102   // the reference.
    103   GtkWidget* drag_icon_;
    104 
    105   ui::GtkSignalRegistrar signals_;
    106 
    107   DISALLOW_COPY_AND_ASSIGN(TabContentsDragSource);
    108 };
    109 
    110 #endif  // CHROME_BROWSER_UI_GTK_TAB_CONTENTS_DRAG_SOURCE_H_
    111