content/browser/web_contents/web_drag_source_gtk.h

   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                      blink::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   base::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_