| // 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 "base/basictypes.h" |
| #include "base/compiler_specific.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "ui/aura/root_window_observer.h" |
| |
| namespace aura { |
| class RootWindow; |
| } |
| |
| namespace ui { |
| class Layer; |
| } |
| |
| namespace ash { |
| namespace internal { |
| |
| // ScreenDimmer displays a partially-opaque layer above everything |
| // else in the root 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 aura::RootWindowObserver { |
| public: |
| class TestApi { |
| public: |
| explicit TestApi(ScreenDimmer* dimmer) : dimmer_(dimmer) {} |
| |
| ui::Layer* layer() { return dimmer_->dimming_layer_.get(); } |
| |
| private: |
| ScreenDimmer* dimmer_; // not owned |
| |
| DISALLOW_COPY_AND_ASSIGN(TestApi); |
| }; |
| |
| explicit ScreenDimmer(aura::RootWindow* root_window); |
| virtual ~ScreenDimmer(); |
| |
| // Dim or undim the root window. |
| void SetDimming(bool should_dim); |
| |
| // aura::RootWindowObserver overrides: |
| virtual void OnRootWindowResized(const aura::RootWindow* root, |
| const gfx::Size& old_size) OVERRIDE; |
| |
| private: |
| friend class TestApi; |
| |
| aura::RootWindow* root_window_; |
| |
| // Partially-opaque layer that's stacked above all of the root window's |
| // children and used to dim the screen. NULL until the first time we dim. |
| scoped_ptr<ui::Layer> dimming_layer_; |
| |
| // Are we currently dimming the screen? |
| bool currently_dimming_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScreenDimmer); |
| }; |
| |
| } // namespace internal |
| } // namespace ash |
| |
| #endif // ASH_WM_SCREEN_DIMMER_H_ |