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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_WM_SCREEN_DIMMER_H_
#define ASH_WM_SCREEN_DIMMER_H_
#include <memory>
#include <vector>
#include "ash/ash_export.h"
#include "ash/shell_observer.h"
namespace ash {
class ScreenDimmerTest;
class WindowDimmer;
template <typename UserData>
class WindowUserData;
// ScreenDimmer displays a partially-opaque layer above everything
// else in the given container window to darken the display. It shouldn't be
// used for long-term brightness adjustments due to performance
// considerations -- it's only intended for cases where we want to
// briefly dim the screen (e.g. to indicate to the user that we're
// about to suspend a machine that lacks an internal backlight that
// can be adjusted).
class ASH_EXPORT ScreenDimmer : public ShellObserver {
public:
ScreenDimmer();
ScreenDimmer(const ScreenDimmer&) = delete;
ScreenDimmer& operator=(const ScreenDimmer&) = delete;
~ScreenDimmer() override;
// Dims or undims the layers.
void SetDimming(bool should_dim);
void set_at_bottom_for_testing(bool at_bottom) { at_bottom_ = at_bottom; }
private:
friend class ScreenDimmerTest;
// ShellObserver:
void OnRootWindowAdded(aura::Window* root_window) override;
// Updates the dimming state. This will also create a new `WindowDimmer` if
// necessary. (Used when a new display is connected).
void Update(bool should_dim);
// Are we currently dimming the screen?
bool is_dimming_ = false;
bool at_bottom_ = false;
// Owns the WindowDimmers.
std::unique_ptr<WindowUserData<WindowDimmer>> window_dimmers_;
};
} // namespace ash
#endif // ASH_WM_SCREEN_DIMMER_H_
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