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web_drag_dest_gtk.h

// Copyright (c) 2009 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 CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
#define CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_

#include <gtk/gtk.h>
#include <vector>

#include "app/gtk_signal.h"
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "chrome/browser/bookmarks/bookmark_drag_data.h"
#include "third_party/WebKit/WebKit/chromium/public/WebDragOperation.h"
#include "webkit/glue/webdropdata.h"

class BookmarkNode;
class TabContents;

// 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 WebDragDestGtk {
 public:
  WebDragDestGtk(TabContents* tab_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();

 private:
  // 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);

  TabContents* tab_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_;

  // The bookmark data for the current tab. This will be empty if there is not
  // a native bookmark drag (or we haven't gotten the data from the source yet).
  BookmarkDragData bookmark_drag_data_;

  ScopedRunnableMethodFactory<WebDragDestGtk> method_factory_;

  DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
};

#endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_

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