src/chrome/browser/ui/views/tabs/media_indicator_button.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 "chrome/browser/ui/views/tabs/media_indicator_button.h"
   6
   7 #include "chrome/browser/ui/views/tabs/tab.h"
   8 #include "chrome/browser/ui/views/tabs/tab_controller.h"
   9 #include "chrome/browser/ui/views/tabs/tab_renderer_data.h"
  10 #include "content/public/browser/user_metrics.h"
  11 #include "ui/gfx/animation/animation_delegate.h"
  12 #include "ui/gfx/canvas.h"
  13 #include "ui/gfx/image/image.h"
  14
  15 using base::UserMetricsAction;
  16
  17 const char MediaIndicatorButton::kViewClassName[] = "MediaIndicatorButton";
  18
  19 class MediaIndicatorButton::FadeAnimationDelegate
  20     : public gfx::AnimationDelegate {
  21  public:
  22   explicit FadeAnimationDelegate(MediaIndicatorButton* button)
  23       : button_(button) {}
  24   ~FadeAnimationDelegate() override {}
  25
  26  private:
  27   // gfx::AnimationDelegate
  28   void AnimationProgressed(const gfx::Animation* animation) override {
  29     button_->SchedulePaint();
  30   }
  31
  32   void AnimationCanceled(const gfx::Animation* animation) override {
  33     button_->showing_media_state_ = button_->media_state_;
  34     button_->SchedulePaint();
  35   }
  36
  37   void AnimationEnded(const gfx::Animation* animation) override {
  38     button_->showing_media_state_ = button_->media_state_;
  39     button_->SchedulePaint();
  40   }
  41
  42   MediaIndicatorButton* const button_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(FadeAnimationDelegate);
  45 };
  46
  47 MediaIndicatorButton::MediaIndicatorButton()
  48     : views::ImageButton(NULL),
  49       media_state_(TAB_MEDIA_STATE_NONE),
  50       showing_media_state_(TAB_MEDIA_STATE_NONE) {
  51   SetEventTargeter(
  52       scoped_ptr<views::ViewTargeter>(new views::ViewTargeter(this)));
  53 }
  54
  55 MediaIndicatorButton::~MediaIndicatorButton() {}
  56
  57 void MediaIndicatorButton::TransitionToMediaState(TabMediaState next_state) {
  58   if (next_state == media_state_)
  59     return;
  60
  61   if (next_state != TAB_MEDIA_STATE_NONE) {
  62     const gfx::ImageSkia* const indicator_image =
  63         chrome::GetTabMediaIndicatorImage(next_state).ToImageSkia();
  64     SetImage(views::CustomButton::STATE_NORMAL, indicator_image);
  65     SetImage(views::CustomButton::STATE_DISABLED, indicator_image);
  66     const gfx::ImageSkia* const affordance_image =
  67         chrome::GetTabMediaIndicatorAffordanceImage(next_state).ToImageSkia();
  68     SetImage(views::CustomButton::STATE_HOVERED, affordance_image);
  69     SetImage(views::CustomButton::STATE_PRESSED, affordance_image);
  70   }
  71
  72   if ((media_state_ == TAB_MEDIA_STATE_AUDIO_PLAYING &&
  73        next_state == TAB_MEDIA_STATE_AUDIO_MUTING) ||
  74       (media_state_ == TAB_MEDIA_STATE_AUDIO_MUTING &&
  75        next_state == TAB_MEDIA_STATE_AUDIO_PLAYING) ||
  76       (media_state_ == TAB_MEDIA_STATE_AUDIO_MUTING &&
  77        next_state == TAB_MEDIA_STATE_NONE)) {
  78     // Instant user feedback: No fade animation.
  79     showing_media_state_ = next_state;
  80     fade_animation_.reset();
  81   } else {
  82     if (next_state == TAB_MEDIA_STATE_NONE)
  83       showing_media_state_ = media_state_;  // Fading-out indicator.
  84     else
  85       showing_media_state_ = next_state;  // Fading-in to next indicator.
  86     fade_animation_ = chrome::CreateTabMediaIndicatorFadeAnimation(next_state);
  87     if (!fade_animation_delegate_)
  88       fade_animation_delegate_.reset(new FadeAnimationDelegate(this));
  89     fade_animation_->set_delegate(fade_animation_delegate_.get());
  90     fade_animation_->Start();
  91   }
  92
  93   SetEnabled(chrome::IsTabAudioMutingFeatureEnabled() &&
  94              (next_state == TAB_MEDIA_STATE_AUDIO_PLAYING ||
  95               next_state == TAB_MEDIA_STATE_AUDIO_MUTING));
  96
  97   // An indicator state change should be made visible immediately, instead of
  98   // the user being surprised when their mouse leaves the button.
  99   if (state() == views::CustomButton::STATE_HOVERED) {
 100     SetState(enabled() ? views::CustomButton::STATE_NORMAL :
 101              views::CustomButton::STATE_DISABLED);
 102   }
 103
 104   media_state_ = next_state;
 105
 106   // Note: The calls to SetImage(), SetEnabled(), and SetState() above will call
 107   // SchedulePaint() if necessary.
 108 }
 109
 110 const char* MediaIndicatorButton::GetClassName() const {
 111   return kViewClassName;
 112 }
 113
 114 views::View* MediaIndicatorButton::GetTooltipHandlerForPoint(
 115     const gfx::Point& point) {
 116   return NULL;  // Tab (the parent View) provides the tooltip.
 117 }
 118
 119 bool MediaIndicatorButton::OnMouseDragged(const ui::MouseEvent& event) {
 120   const ButtonState previous_state = state();
 121   const bool ret = ImageButton::OnMouseDragged(event);
 122   if (previous_state != views::CustomButton::STATE_NORMAL &&
 123       state() == views::CustomButton::STATE_NORMAL)
 124     content::RecordAction(UserMetricsAction("MediaIndicatorButton_Dragged"));
 125   return ret;
 126 }
 127
 128 void MediaIndicatorButton::OnPaint(gfx::Canvas* canvas) {
 129   double opaqueness =
 130       fade_animation_ ? fade_animation_->GetCurrentValue() : 1.0;
 131   if (media_state_ == TAB_MEDIA_STATE_NONE)
 132     opaqueness = 1.0 - opaqueness;  // Fading out, not in.
 133   if (opaqueness < 1.0)
 134     canvas->SaveLayerAlpha(opaqueness * SK_AlphaOPAQUE);
 135   ImageButton::OnPaint(canvas);
 136   if (opaqueness < 1.0)
 137     canvas->Restore();
 138 }
 139
 140 bool MediaIndicatorButton::DoesIntersectRect(const views::View* target,
 141                                              const gfx::Rect& rect) const {
 142   // If this button is not enabled, Tab (the parent View) handles all mouse
 143   // events.
 144   return enabled() &&
 145       views::ViewTargeterDelegate::DoesIntersectRect(target, rect);
 146 }
 147
 148 void MediaIndicatorButton::NotifyClick(const ui::Event& event) {
 149   if (media_state_ == TAB_MEDIA_STATE_AUDIO_PLAYING)
 150     content::RecordAction(UserMetricsAction("MediaIndicatorButton_Mute"));
 151   else if (media_state_ == TAB_MEDIA_STATE_AUDIO_MUTING)
 152     content::RecordAction(UserMetricsAction("MediaIndicatorButton_Unmute"));
 153   else
 154     NOTREACHED();
 155
 156   DCHECK(parent() && !strcmp(parent()->GetClassName(), Tab::kViewClassName));
 157   Tab* const tab = static_cast<Tab*>(parent());
 158   tab->controller()->ToggleTabAudioMute(tab);
 159 }