TabContents -> WebContentsImpl, part 2.

content/browser/tab_contents/web_drag_dest_gtk.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
-#define CONTENT_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
-#pragma once
-
-#include <gtk/gtk.h>
-
-#include "base/gtest_prod_util.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "content/common/content_export.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
-#include "ui/base/gtk/gtk_signal.h"
-#include "webkit/glue/webdropdata.h"
-
-namespace content {
-
-class RenderViewHostImpl;
-class WebContents;
-class WebDragDestDelegate;
-
-// A helper class that handles DnD for drops in the renderer. In GTK parlance,
-// this handles destination-side DnD, but not source-side DnD.
-class CONTENT_EXPORT WebDragDestGtk {
- public:
-  WebDragDestGtk(WebContents* web_contents, GtkWidget* widget);
-  ~WebDragDestGtk();
-
-  // This is called when the renderer responds to a drag motion event. We must
-  // update the system drag cursor.
-  void UpdateDragStatus(WebKit::WebDragOperation operation);
-
-  // Informs the renderer when a system drag has left the render view.
-  // See OnDragLeave().
-  void DragLeave();
-
-  WebDragDestDelegate* delegate() const { return delegate_; }
-  void set_delegate(WebDragDestDelegate* delegate) { delegate_ = delegate; }
-
- private:
-  content::RenderViewHostImpl* GetRenderViewHost() const;
-
-  // Called when a system drag crosses over the render view. As there is no drag
-  // enter event, we treat it as an enter event (and not a regular motion event)
-  // when |context_| is NULL.
-  CHROMEGTK_CALLBACK_4(WebDragDestGtk, gboolean, OnDragMotion, GdkDragContext*,
-                       gint, gint, guint);
-
-  // We make a series of requests for the drag data when the drag first enters
-  // the render view. This is the callback that is used to give us the data
-  // for each individual target. When |data_requests_| reaches 0, we know we
-  // have attained all the data, and we can finally tell the renderer about the
-  // drag.
-  CHROMEGTK_CALLBACK_6(WebDragDestGtk, void, OnDragDataReceived,
-                       GdkDragContext*, gint, gint, GtkSelectionData*,
-                       guint, guint);
-
-  // The drag has left our widget; forward this information to the renderer.
-  CHROMEGTK_CALLBACK_2(WebDragDestGtk, void, OnDragLeave, GdkDragContext*,
-                       guint);
-
-  // Called by GTK when the user releases the mouse, executing a drop.
-  CHROMEGTK_CALLBACK_4(WebDragDestGtk, gboolean, OnDragDrop, GdkDragContext*,
-                       gint, gint, guint);
-
-  WebContents* web_contents_;
-
-  // The render view.
-  GtkWidget* widget_;
-
-  // The current drag context for system drags over our render view, or NULL if
-  // there is no system drag or the system drag is not over our render view.
-  GdkDragContext* context_;
-
-  // The data for the current drag, or NULL if |context_| is NULL.
-  scoped_ptr<WebDropData> drop_data_;
-
-  // The number of outstanding drag data requests we have sent to the drag
-  // source.
-  int data_requests_;
-
-  // The last time we sent a message to the renderer related to a drag motion.
-  gint drag_over_time_;
-
-  // Whether the cursor is over a drop target, according to the last message we
-  // got from the renderer.
-  bool is_drop_target_;
-
-  // Handler ID for the destroy signal handler. We connect to the destroy
-  // signal handler so that we won't call dest_unset on it after it is
-  // destroyed, but we have to cancel the handler if we are destroyed before
-  // |widget_| is.
-  int destroy_handler_;
-
-  // A delegate that can receive drag information about drag events.
-  WebDragDestDelegate* delegate_;
-
-  base::WeakPtrFactory<WebDragDestGtk> method_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_