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// Copyright 2014 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 ATHENA_WM_TITLE_DRAG_CONTROLLER_H_
#define ATHENA_WM_TITLE_DRAG_CONTROLLER_H_
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "ui/aura/window_tracker.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/geometry/point.h"
namespace aura {
class Window;
}
namespace wm {
class Shadow;
}
namespace athena {
class TitleDragControllerDelegate {
public:
virtual ~TitleDragControllerDelegate() {}
// Returns the window behind |window|. The returned window is the one that
// would be revealed while |window|'s title is dragged.
virtual aura::Window* GetWindowBehind(aura::Window* window) = 0;
// Notifies the delegate during various stages of the drag.
virtual void OnTitleDragStarted(aura::Window* window) = 0;
virtual void OnTitleDragCompleted(aura::Window* window) = 0;
virtual void OnTitleDragCanceled(aura::Window* window) = 0;
};
// Responsible for allowing dragging a window by its title bar.
class TitleDragController : public ui::EventHandler {
public:
TitleDragController(aura::Window* container,
TitleDragControllerDelegate* delegate);
virtual ~TitleDragController();
private:
void EndTransition(aura::Window* window, bool complete);
void OnTransitionEnd(aura::Window* window, bool complete);
// ui::EventHandler:
virtual void OnGestureEvent(ui::GestureEvent* gesture) OVERRIDE;
aura::Window* container_;
TitleDragControllerDelegate* delegate_;
gfx::Point drag_start_location_;
scoped_ptr<wm::Shadow> shadow_;
aura::WindowTracker tracker_;
base::WeakPtrFactory<TitleDragController> weak_ptr_;
DISALLOW_COPY_AND_ASSIGN(TitleDragController);
};
} // namespace athena
#endif // ATHENA_WM_TITLE_DRAG_CONTROLLER_H_
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