src/ash/display/display_configurator_animation.cc

   1 // Copyright 2014 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/display/display_configurator_animation.h"
   6
   7 #include "ash/shell.h"
   8 #include "ash/shell_window_ids.h"
   9 #include "base/bind.h"
  10 #include "base/stl_util.h"
  11 #include "base/time/time.h"
  12 #include "ui/aura/window.h"
  13 #include "ui/aura/window_event_dispatcher.h"
  14 #include "ui/compositor/layer.h"
  15 #include "ui/compositor/layer_animation_observer.h"
  16 #include "ui/compositor/layer_animation_sequence.h"
  17 #include "ui/compositor/layer_animator.h"
  18 #include "ui/compositor/scoped_layer_animation_settings.h"
  19
  20 namespace ash {
  21 namespace {
  22
  23 const int kFadingAnimationDurationInMS = 200;
  24 const int kFadingTimeoutDurationInSeconds = 10;
  25
  26 // CallbackRunningObserver accepts multiple layer animations and
  27 // runs the specified |callback| when all of the animations have finished.
  28 class CallbackRunningObserver {
  29  public:
  30   CallbackRunningObserver(base::Closure callback)
  31       : completed_counter_(0),
  32         animation_aborted_(false),
  33         callback_(callback) {}
  34
  35   void AddNewAnimator(ui::LayerAnimator* animator) {
  36     Observer* observer = new Observer(animator, this);
  37     animator->AddObserver(observer);
  38     observer_list_.push_back(observer);
  39   }
  40
  41  private:
  42   void OnSingleTaskCompleted() {
  43     completed_counter_++;
  44     if (completed_counter_ >= observer_list_.size()) {
  45       base::MessageLoopForUI::current()->DeleteSoon(FROM_HERE, this);
  46       if (!animation_aborted_)
  47         base::MessageLoopForUI::current()->PostTask(FROM_HERE, callback_);
  48     }
  49   }
  50
  51   void OnSingleTaskAborted() {
  52     animation_aborted_ = true;
  53     OnSingleTaskCompleted();
  54   }
  55
  56   // The actual observer to listen each animation completion.
  57   class Observer : public ui::LayerAnimationObserver {
  58    public:
  59     Observer(ui::LayerAnimator* animator,
  60              CallbackRunningObserver* observer)
  61         : animator_(animator),
  62           observer_(observer) {}
  63
  64    protected:
  65     // ui::LayerAnimationObserver overrides:
  66     virtual void OnLayerAnimationEnded(
  67         ui::LayerAnimationSequence* sequence) override {
  68       animator_->RemoveObserver(this);
  69       observer_->OnSingleTaskCompleted();
  70     }
  71     virtual void OnLayerAnimationAborted(
  72         ui::LayerAnimationSequence* sequence) override {
  73       animator_->RemoveObserver(this);
  74       observer_->OnSingleTaskAborted();
  75     }
  76     virtual void OnLayerAnimationScheduled(
  77         ui::LayerAnimationSequence* sequence) override {
  78     }
  79     virtual bool RequiresNotificationWhenAnimatorDestroyed() const override {
  80       return true;
  81     }
  82
  83    private:
  84     ui::LayerAnimator* animator_;
  85     CallbackRunningObserver* observer_;
  86
  87     DISALLOW_COPY_AND_ASSIGN(Observer);
  88   };
  89
  90   size_t completed_counter_;
  91   bool animation_aborted_;
  92   ScopedVector<Observer> observer_list_;
  93   base::Closure callback_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(CallbackRunningObserver);
  96 };
  97
  98 }  // namespace
  99
 100 DisplayConfiguratorAnimation::DisplayConfiguratorAnimation()
 101     : weak_ptr_factory_(this) {
 102 }
 103
 104 DisplayConfiguratorAnimation::~DisplayConfiguratorAnimation() {
 105   ClearHidingLayers();
 106 }
 107
 108 void DisplayConfiguratorAnimation::StartFadeOutAnimation(
 109     base::Closure callback) {
 110   CallbackRunningObserver* observer = new CallbackRunningObserver(callback);
 111   ClearHidingLayers();
 112
 113   // Make the fade-out animation for all root windows.  Instead of actually
 114   // hiding the root windows, we put a black layer over a root window for
 115   // safety.  These layers remain to hide root windows and will be deleted
 116   // after the animation of OnDisplayModeChanged().
 117   aura::Window::Windows root_windows =
 118       Shell::GetInstance()->GetAllRootWindows();
 119   for (aura::Window::Windows::const_iterator it = root_windows.begin();
 120        it != root_windows.end(); ++it) {
 121     aura::Window* root_window = *it;
 122     ui::Layer* hiding_layer = new ui::Layer(ui::LAYER_SOLID_COLOR);
 123     hiding_layer->SetColor(SK_ColorBLACK);
 124     hiding_layer->SetBounds(root_window->bounds());
 125     ui::Layer* parent =
 126         ash::Shell::GetContainer(root_window,
 127                                  ash::kShellWindowId_OverlayContainer)->layer();
 128     parent->Add(hiding_layer);
 129
 130     hiding_layer->SetOpacity(0.0);
 131
 132     ui::ScopedLayerAnimationSettings settings(hiding_layer->GetAnimator());
 133     settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
 134         kFadingAnimationDurationInMS));
 135     observer->AddNewAnimator(hiding_layer->GetAnimator());
 136     hiding_layer->SetOpacity(1.0f);
 137     hiding_layer->SetVisible(true);
 138     hiding_layers_[root_window] = hiding_layer;
 139   }
 140
 141   // In case that OnDisplayModeChanged() isn't called or its animator is
 142   // canceled due to some unknown errors, we set a timer to clear these
 143   // hiding layers.
 144   timer_.reset(new base::OneShotTimer<DisplayConfiguratorAnimation>());
 145   timer_->Start(FROM_HERE,
 146                 base::TimeDelta::FromSeconds(kFadingTimeoutDurationInSeconds),
 147                 this,
 148                 &DisplayConfiguratorAnimation::ClearHidingLayers);
 149 }
 150
 151 void DisplayConfiguratorAnimation::StartFadeInAnimation() {
 152   // We want to make sure clearing all of hiding layers after the animation
 153   // finished.  Note that this callback can be canceled, but the cancel only
 154   // happens when the next animation is scheduled.  Thus the hiding layers
 155   // should be deleted eventually.
 156   CallbackRunningObserver* observer = new CallbackRunningObserver(
 157       base::Bind(&DisplayConfiguratorAnimation::ClearHidingLayers,
 158                  weak_ptr_factory_.GetWeakPtr()));
 159
 160   // Ensure that layers are not animating.
 161   for (std::map<aura::Window*, ui::Layer*>::iterator it =
 162            hiding_layers_.begin(); it != hiding_layers_.end(); ++it) {
 163     ui::LayerAnimator* animator = it->second->GetAnimator();
 164     if (animator->is_animating())
 165       animator->StopAnimating();
 166   }
 167
 168   // Schedules the fade-in effect for all root windows.  Because we put the
 169   // black layers for fade-out, here we actually turn those black layers
 170   // invisible.
 171   aura::Window::Windows root_windows =
 172       Shell::GetInstance()->GetAllRootWindows();
 173   for (aura::Window::Windows::const_iterator it = root_windows.begin();
 174        it != root_windows.end(); ++it) {
 175     aura::Window* root_window = *it;
 176     ui::Layer* hiding_layer = NULL;
 177     if (hiding_layers_.find(root_window) == hiding_layers_.end()) {
 178       // In case of the transition from mirroring->non-mirroring, new root
 179       // windows appear and we do not have the black layers for them.  Thus
 180       // we need to create the layer and make it visible.
 181       hiding_layer = new ui::Layer(ui::LAYER_SOLID_COLOR);
 182       hiding_layer->SetColor(SK_ColorBLACK);
 183       hiding_layer->SetBounds(root_window->bounds());
 184       ui::Layer* parent =
 185           ash::Shell::GetContainer(
 186               root_window, ash::kShellWindowId_OverlayContainer)->layer();
 187       parent->Add(hiding_layer);
 188       hiding_layer->SetOpacity(1.0f);
 189       hiding_layer->SetVisible(true);
 190       hiding_layers_[root_window] = hiding_layer;
 191     } else {
 192       hiding_layer = hiding_layers_[root_window];
 193       if (hiding_layer->bounds() != root_window->bounds())
 194         hiding_layer->SetBounds(root_window->bounds());
 195     }
 196
 197     ui::ScopedLayerAnimationSettings settings(hiding_layer->GetAnimator());
 198     settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
 199         kFadingAnimationDurationInMS));
 200     observer->AddNewAnimator(hiding_layer->GetAnimator());
 201     hiding_layer->SetOpacity(0.0f);
 202     hiding_layer->SetVisible(false);
 203   }
 204 }
 205
 206 void DisplayConfiguratorAnimation::OnDisplayModeChanged(
 207     const ui::DisplayConfigurator::DisplayStateList& displays) {
 208   if (!hiding_layers_.empty())
 209     StartFadeInAnimation();
 210 }
 211
 212 void DisplayConfiguratorAnimation::OnDisplayModeChangeFailed(
 213     ui::MultipleDisplayState failed_new_state) {
 214   if (!hiding_layers_.empty())
 215     StartFadeInAnimation();
 216 }
 217
 218 void DisplayConfiguratorAnimation::ClearHidingLayers() {
 219   if (timer_) {
 220     timer_->Stop();
 221     timer_.reset();
 222   }
 223   STLDeleteContainerPairSecondPointers(
 224       hiding_layers_.begin(), hiding_layers_.end());
 225   hiding_layers_.clear();
 226 }
 227
 228 }  // namespace ash