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// Copyright (c) 2011 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_
#pragma once
#include <gtk/gtk.h>
#include "base/memory/scoped_ptr.h"
#include "base/task.h"
#include "chrome/browser/bookmarks/bookmark_node_data.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
#include "ui/base/gtk/gtk_signal.h"
#include "webkit/glue/webdropdata.h"
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);
virtual ~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).
BookmarkNodeData 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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