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// 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_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_
#define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_
#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 "content/public/common/drop_data.h"
#include "third_party/WebKit/public/web/WebDragOperation.h"
#include "ui/base/gtk/gtk_signal.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();
DropData* current_drop_data() const { return drop_data_.get(); }
// This is called when the renderer responds to a drag motion event. We must
// update the system drag cursor.
void UpdateDragStatus(blink::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; }
GtkWidget* widget() const { return widget_; }
private:
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<DropData> 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_;
// Stores Handler IDs for the gtk signal handlers. We have to cancel the
// signal handlers when this WebDragDestGtk is deleted so that if, later on,
// we re-create the drag dest with the same widget, we don't get callbacks to
// deleted functions.
scoped_ptr<int[]> handlers_;
// A delegate that can receive drag information about drag events.
WebDragDestDelegate* delegate_;
// True if the drag has been canceled.
bool canceled_;
base::WeakPtrFactory<WebDragDestGtk> method_factory_;
DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
};
} // namespace content
#endif // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_
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