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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_WM_SHADOW_CONTROLLER_H_
#define ASH_WM_SHADOW_CONTROLLER_H_
#include <map>
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/linked_ptr.h"
#include "base/scoped_observer.h"
#include "ui/aura/client/activation_change_observer.h"
#include "ui/aura/env_observer.h"
#include "ui/aura/window_observer.h"
namespace aura {
class Window;
}
namespace gfx {
class Rect;
}
namespace ash {
namespace internal {
class Shadow;
// ShadowController observes changes to windows and creates and updates drop
// shadows as needed.
class ASH_EXPORT ShadowController :
public aura::EnvObserver,
public aura::WindowObserver,
public aura::client::ActivationChangeObserver {
public:
class TestApi {
public:
explicit TestApi(ShadowController* controller) : controller_(controller) {}
~TestApi() {}
Shadow* GetShadowForWindow(aura::Window* window) {
return controller_->GetShadowForWindow(window);
}
private:
ShadowController* controller_; // not owned
DISALLOW_COPY_AND_ASSIGN(TestApi);
};
explicit ShadowController();
virtual ~ShadowController();
// aura::EnvObserver override:
virtual void OnWindowInitialized(aura::Window* window) OVERRIDE;
// aura::WindowObserver overrides:
virtual void OnWindowPropertyChanged(
aura::Window* window, const void* key, intptr_t old) OVERRIDE;
virtual void OnWindowBoundsChanged(
aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) OVERRIDE;
virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
// aura::client::ActivationChangeObserver overrides:
virtual void OnWindowActivated(aura::Window* active,
aura::Window* old_active) OVERRIDE;
private:
typedef std::map<aura::Window*, linked_ptr<Shadow> > WindowShadowMap;
// Checks if |window| is visible and contains a property requesting a shadow.
bool ShouldShowShadowForWindow(aura::Window* window) const;
// Returns |window|'s shadow from |window_shadows_|, or NULL if no shadow
// exists.
Shadow* GetShadowForWindow(aura::Window* window);
// Updates the shadow styles for windows when activation changes.
void HandleWindowActivationChange(aura::Window* gaining_active,
aura::Window* losing_active);
// Shows or hides |window|'s shadow as needed (creating the shadow if
// necessary).
void HandlePossibleShadowVisibilityChange(aura::Window* window);
// Creates a new shadow for |window| and stores it in |window_shadows_|. The
// shadow's bounds are initialized and it is added to the window's layer.
void CreateShadowForWindow(aura::Window* window);
WindowShadowMap window_shadows_;
ScopedObserver<aura::Window, aura::WindowObserver> observer_manager_;
DISALLOW_COPY_AND_ASSIGN(ShadowController);
};
} // namespace internal
} // namespace ash
#endif // ASH_WM_SHADOW_CONTROLLER_H_