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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 ASH_DRAG_DROP_DRAG_DROP_TRACKER_H_
#define ASH_DRAG_DROP_DRAG_DROP_TRACKER_H_
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "ui/events/event.h"
namespace aura {
class Window;
class WindowDelegate;
}
namespace ash {
// Provides functions for handling drag events inside and outside the root
// window where drag is started. This internally sets up a capture window for
// tracking drag events outside the root window where drag is initiated.
// ash/wm/coordinate_conversion.h is used internally and only X11 environment
// is supported for now.
class ASH_EXPORT DragDropTracker {
public:
DragDropTracker(aura::Window* context_root,
aura::WindowDelegate* delegate);
~DragDropTracker();
aura::Window* capture_window() { return capture_window_.get(); }
// Tells our |capture_window_| to take capture. This is not done right at
// creation to give the caller a chance to perform any operations needed
// before the capture is transfered.
void TakeCapture();
// Gets the target located at |event| in the coordinates of the active root
// window.
aura::Window* GetTarget(const ui::LocatedEvent& event);
// Converts the locations of |event| in the coordinates of the active root
// window to the ones in |target|'s coordinates.
// Caller takes ownership of the returned object.
ui::LocatedEvent* ConvertEvent(aura::Window* target,
const ui::LocatedEvent& event);
private:
// A window for capturing drag events while dragging.
scoped_ptr<aura::Window> capture_window_;
DISALLOW_COPY_AND_ASSIGN(DragDropTracker);
};
} // namespace ash
#endif // ASH_DRAG_DROP_DRAG_DROP_TRACKER_H_
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