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      1 // Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_GTK_H_
      6 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_GTK_H_
      7 
      8 #include <gtk/gtk.h>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/files/file_path.h"
     12 #include "base/message_loop/message_loop.h"
     13 #include "base/strings/string16.h"
     14 #include "content/common/content_export.h"
     15 #include "content/public/browser/web_contents.h"
     16 #include "third_party/WebKit/public/web/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/vector2d.h"
     21 #include "url/gurl.h"
     22 
     23 class SkBitmap;
     24 
     25 namespace content {
     26 
     27 class RenderViewHostImpl;
     28 class WebContentsImpl;
     29 struct DropData;
     30 
     31 // WebDragSourceGtk takes care of managing the drag from a WebContents
     32 // with Gtk.
     33 class CONTENT_EXPORT WebDragSourceGtk :
     34     public base::MessageLoopForUI::Observer {
     35  public:
     36   explicit WebDragSourceGtk(WebContents* web_contents);
     37   virtual ~WebDragSourceGtk();
     38 
     39   // Starts a drag for the WebContents this WebDragSourceGtk was created for.
     40   // Returns false if the drag could not be started.
     41   bool StartDragging(const DropData& drop_data,
     42                      WebKit::WebDragOperationsMask allowed_ops,
     43                      GdkEventButton* last_mouse_down,
     44                      const SkBitmap& image,
     45                      const gfx::Vector2d& image_offset);
     46 
     47   // MessageLoop::Observer implementation:
     48   virtual void WillProcessEvent(GdkEvent* event) OVERRIDE;
     49   virtual void DidProcessEvent(GdkEvent* event) OVERRIDE;
     50 
     51  private:
     52   CHROMEGTK_CALLBACK_2(WebDragSourceGtk, gboolean, OnDragFailed,
     53                        GdkDragContext*, GtkDragResult);
     54   CHROMEGTK_CALLBACK_1(WebDragSourceGtk, void, OnDragBegin,
     55                        GdkDragContext*);
     56   CHROMEGTK_CALLBACK_1(WebDragSourceGtk, void, OnDragEnd,
     57                        GdkDragContext*);
     58   CHROMEGTK_CALLBACK_4(WebDragSourceGtk, void, OnDragDataGet,
     59                        GdkDragContext*, GtkSelectionData*, guint, guint);
     60   CHROMEGTK_CALLBACK_1(WebDragSourceGtk, gboolean, OnDragIconExpose,
     61                        GdkEventExpose*);
     62 
     63   gfx::NativeView GetContentNativeView() const;
     64 
     65   // The tab we're manging the drag for.
     66   WebContentsImpl* web_contents_;
     67 
     68   // The drop data for the current drag (for drags that originate in the render
     69   // view). Non-NULL iff there is a current drag.
     70   scoped_ptr<DropData> drop_data_;
     71 
     72   // The image used for depicting the drag, and the offset between the cursor
     73   // and the top left pixel.
     74   GdkPixbuf* drag_pixbuf_;
     75   gfx::Vector2d image_offset_;
     76 
     77   // The mime type for the file contents of the current drag (if any).
     78   GdkAtom drag_file_mime_type_;
     79 
     80   // Whether the current drag has failed. Meaningless if we are not the source
     81   // for a current drag.
     82   bool drag_failed_;
     83 
     84   // This is the widget we use to initiate drags. Since we don't use the
     85   // renderer widget, we can persist drags even when our contents is switched
     86   // out. We can't use an OwnedWidgetGtk because the GtkInvisible widget
     87   // initialization code sinks the reference.
     88   GtkWidget* drag_widget_;
     89 
     90   // Context created once drag starts.  A NULL value indicates that there is
     91   // no drag currently in progress.
     92   GdkDragContext* drag_context_;
     93 
     94   // The file mime type for a drag-out download.
     95   string16 wide_download_mime_type_;
     96 
     97   // The file name to be saved to for a drag-out download.
     98   base::FilePath download_file_name_;
     99 
    100   // The URL to download from for a drag-out download.
    101   GURL download_url_;
    102 
    103   // The widget that provides visual feedback for the drag. We can't use
    104   // an OwnedWidgetGtk because the GtkWindow initialization code sinks
    105   // the reference.
    106   GtkWidget* drag_icon_;
    107 
    108   ui::GtkSignalRegistrar signals_;
    109 
    110   DISALLOW_COPY_AND_ASSIGN(WebDragSourceGtk);
    111 };
    112 
    113 }  // namespace content
    114 
    115 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_GTK_H_
    116