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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 UI_WM_CORE_SHADOW_CONTROLLER_H_
#define UI_WM_CORE_SHADOW_CONTROLLER_H_
#include <map>
#include <memory>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "ui/compositor_extra/shadow.h"
#include "ui/wm/public/activation_change_observer.h"
namespace aura {
class Env;
class Window;
}
namespace ui {
class ColorProvider;
class Shadow;
}
namespace wm {
class ActivationClient;
class ShadowControllerDelegate;
// 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 COMPONENT_EXPORT(UI_WM) ShadowController
: public ActivationChangeObserver {
public:
// Returns the shadow for the |window|, or NULL if no shadow exists.
static ui::Shadow* GetShadowForWindow(aura::Window* window);
// Generate an elevation to shadow colors map with given color provider.
static ui::Shadow::ElevationToColorsMap GenerateShadowColorsMap(
const ui::ColorProvider* color_provider);
ShadowController(ActivationClient* activation_client,
std::unique_ptr<ShadowControllerDelegate> delegate,
aura::Env* env = nullptr);
ShadowController(const ShadowController&) = delete;
ShadowController& operator=(const ShadowController&) = delete;
~ShadowController() override;
bool IsShadowVisibleForWindow(aura::Window* window);
// Updates the shadow for |window|. Does nothing if |window| is not observed
// by the shadow controller impl. This function should be called if the shadow
// needs to be modified outside of normal window changes (eg. window
// activation, window property change).
void UpdateShadowForWindow(aura::Window* window);
// ActivationChangeObserver overrides:
void OnWindowActivated(ActivationChangeObserver::ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) override;
private:
class Impl;
raw_ptr<ActivationClient> activation_client_;
scoped_refptr<Impl> impl_;
};
} // namespace wm
#endif // UI_WM_CORE_SHADOW_CONTROLLER_H_
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