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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "ash/wm/screen_dimmer.h" |
| 6 |
| 7 #include "ash/shell.h" |
| 8 #include "base/time.h" |
| 9 #include "ui/aura/root_window.h" |
| 10 #include "ui/gfx/compositor/layer.h" |
| 11 #include "ui/gfx/compositor/scoped_layer_animation_settings.h" |
| 12 #include "ui/gfx/rect.h" |
| 13 #include "ui/gfx/size.h" |
| 14 |
| 15 namespace ash { |
| 16 namespace internal { |
| 17 |
| 18 namespace { |
| 19 |
| 20 // Opacity for |dimming_layer_| when it's dimming the screen. |
| 21 const float kDimmingLayerOpacity = 0.4f; |
| 22 |
| 23 // Duration for dimming animations, in milliseconds. |
| 24 const int kDimmingTransitionMs = 200; |
| 25 |
| 26 } // namespace |
| 27 |
| 28 ScreenDimmer::ScreenDimmer() : currently_dimming_(false) { |
| 29 Shell::GetInstance()->GetRootWindow()->AddRootWindowObserver(this); |
| 30 } |
| 31 |
| 32 ScreenDimmer::~ScreenDimmer() { |
| 33 Shell::GetInstance()->GetRootWindow()->RemoveRootWindowObserver(this); |
| 34 } |
| 35 |
| 36 void ScreenDimmer::SetDimming(bool should_dim) { |
| 37 if (should_dim == currently_dimming_) |
| 38 return; |
| 39 |
| 40 if (!dimming_layer_.get()) { |
| 41 dimming_layer_.reset(new ui::Layer(ui::LAYER_SOLID_COLOR)); |
| 42 dimming_layer_->SetColor(SK_ColorBLACK); |
| 43 dimming_layer_->SetOpacity(0.0f); |
| 44 ui::Layer* root_layer = Shell::GetRootWindow()->layer(); |
| 45 dimming_layer_->SetBounds(root_layer->bounds()); |
| 46 root_layer->Add(dimming_layer_.get()); |
| 47 root_layer->StackAtTop(dimming_layer_.get()); |
| 48 } |
| 49 |
| 50 currently_dimming_ = should_dim; |
| 51 |
| 52 ui::ScopedLayerAnimationSettings scoped_settings( |
| 53 dimming_layer_->GetAnimator()); |
| 54 scoped_settings.SetTransitionDuration( |
| 55 base::TimeDelta::FromMilliseconds(kDimmingTransitionMs)); |
| 56 dimming_layer_->SetOpacity(should_dim ? kDimmingLayerOpacity : 0.0f); |
| 57 } |
| 58 |
| 59 void ScreenDimmer::OnRootWindowResized(const aura::RootWindow* root, |
| 60 const gfx::Size& old_size) { |
| 61 if (dimming_layer_.get()) |
| 62 dimming_layer_->SetBounds(gfx::Rect(root->bounds().size())); |
| 63 } |
| 64 |
| 65 } // namespace internal |
| 66 } // namespace ash |
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