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// Copyright 2012 The Chromium Authors
// 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 <memory>
#include "ash/ash_export.h"
#include "base/functional/bind.h"
#include "ui/events/event.h"
namespace aura {
class Window;
}
namespace ash {
class DragDropTrackerDelegate;
using CancelDragDropCallback = base::RepeatingCallback<void(void)>;
// 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.
// Only X11 environment is supported for now.
class ASH_EXPORT DragDropTracker {
public:
DragDropTracker(aura::Window* context_root, CancelDragDropCallback callback);
DragDropTracker(const DragDropTracker&) = delete;
DragDropTracker& operator=(const DragDropTracker&) = delete;
~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 transferred.
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.
std::unique_ptr<ui::LocatedEvent> ConvertEvent(aura::Window* target,
const ui::LocatedEvent& event);
private:
std::unique_ptr<ash::DragDropTrackerDelegate> tracker_window_delegate_;
// A window for capturing drag events while dragging.
std::unique_ptr<aura::Window> capture_window_;
};
} // namespace ash
#endif // ASH_DRAG_DROP_DRAG_DROP_TRACKER_H_
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