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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_SCREEN_DIMMER_H_
#define ASH_WM_SCREEN_DIMMER_H_
#include "ash/ash_export.h"
#include "ash/shell_observer.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "ui/aura/window_observer.h"
namespace ui {
class Layer;
}
namespace ash {
class DimWindow;
// 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 : ShellObserver {
public:
// Creates a screen dimmer for the containers given by |container_id|.
// It's owned by the container in the primary root window and will be
// destroyed when the container is destroyed.
static ScreenDimmer* GetForContainer(int container_id);
// Creates a dimmer a root window level. This is used for suspend animation.
static ScreenDimmer* GetForRoot();
~ScreenDimmer() override;
// Dim or undim the layers.
void SetDimming(bool should_dim);
void set_at_bottom(bool at_bottom) { at_bottom_ = at_bottom; }
bool is_dimming() const { return is_dimming_; }
// Find a ScreenDimmer in the container, or nullptr if it does not exist.
static ScreenDimmer* FindForTest(int container_id);
private:
static aura::Window* FindContainer(int container_id);
explicit ScreenDimmer(int container_id);
// ShellObserver:
void OnRootWindowAdded(aura::Window* root_window) override;
// Update the dimming state. This will also create a new DimWindow
// if necessary. (Used when a new display is connected)
void Update(bool should_dim);
int container_id_;
float target_opacity_;
// Are we currently dimming the screen?
bool is_dimming_;
bool at_bottom_;
DISALLOW_COPY_AND_ASSIGN(ScreenDimmer);
};
} // namespace ash
#endif // ASH_WM_SCREEN_DIMMER_H_
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