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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 UI_WM_CORE_SHADOW_CONTROLLER_H_
#define UI_WM_CORE_SHADOW_CONTROLLER_H_
#include <map>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "ui/wm/public/activation_change_observer.h"
#include "ui/wm/wm_export.h"
namespace aura {
class Window;
namespace client {
class ActivationClient;
}
}
namespace wm {
class Shadow;
// ShadowController observes changes to windows and creates and updates drop
// shadows as needed. ShadowController itself is light weight and per
// ActivationClient. ShadowController delegates to its implementation class,
// which observes all window creation.
class WM_EXPORT ShadowController :
public aura::client::ActivationChangeObserver {
public:
// Returns the shadow for the |window|, or NULL if no shadow exists.
static Shadow* GetShadowForWindow(aura::Window* window);
explicit ShadowController(aura::client::ActivationClient* activation_client);
~ShadowController() override;
// aura::client::ActivationChangeObserver overrides:
void OnWindowActivated(
aura::client::ActivationChangeObserver::ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) override;
private:
class Impl;
aura::client::ActivationClient* activation_client_;
scoped_refptr<Impl> impl_;
DISALLOW_COPY_AND_ASSIGN(ShadowController);
};
} // namespace wm
#endif // UI_WM_CORE_SHADOW_CONTROLLER_H_