chrome/browser/ui/views/tabs/media_indicator_button.h

   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 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_MEDIA_INDICATOR_BUTTON_H_
   6 #define CHROME_BROWSER_UI_VIEWS_TABS_MEDIA_INDICATOR_BUTTON_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "chrome/browser/ui/tabs/tab_utils.h"
  10 #include "ui/views/controls/button/image_button.h"
  11 #include "ui/views/view_targeter_delegate.h"
  12
  13 namespace gfx {
  14 class Animation;
  15 class AnimationDelegate;
  16 }
  17
  18 // This is an ImageButton subclass that serves as both the media indicator icon
  19 // (audio, tab capture, etc.), and as a mute button.  It is meant to only be
  20 // used as a child view of Tab.
  21 //
  22 // When the indicator is transitioned to the audio playing or muting state, the
  23 // button functionality is enabled and begins handling mouse events.  Otherwise,
  24 // this view behaves like an image and all mouse events will be handled by the
  25 // Tab (its parent View).
  26 class MediaIndicatorButton : public views::ImageButton,
  27                              public views::ViewTargeterDelegate {
  28  public:
  29   // The MediaIndicatorButton's class name.
  30   static const char kViewClassName[];
  31
  32   MediaIndicatorButton();
  33   ~MediaIndicatorButton() override;
  34
  35   // Returns the current TabMediaState except, while the indicator image is
  36   // fading out, returns the prior TabMediaState.
  37   TabMediaState showing_media_state() const {
  38     return showing_media_state_;
  39   }
  40
  41   // Updates ImageButton images, starts fade animations, and
  42   // activates/deactivates button functionality as appropriate.
  43   void TransitionToMediaState(TabMediaState next_state);
  44
  45  protected:
  46   // views::View:
  47   const char* GetClassName() const override;
  48   View* GetTooltipHandlerForPoint(const gfx::Point& point) override;
  49   bool OnMousePressed(const ui::MouseEvent& event) override;
  50   bool OnMouseDragged(const ui::MouseEvent& event) override;
  51   void OnPaint(gfx::Canvas* canvas) override;
  52
  53   // views::ViewTargeterDelegate
  54   bool DoesIntersectRect(const View* target,
  55                          const gfx::Rect& rect) const override;
  56
  57   // views::Button:
  58   void NotifyClick(const ui::Event& event) override;
  59
  60  private:
  61   class FadeAnimationDelegate;
  62
  63   TabMediaState media_state_;
  64
  65   // Media indicator fade-in/out animation (i.e., only on show/hide, not a
  66   // continuous animation).
  67   scoped_ptr<gfx::AnimationDelegate> fade_animation_delegate_;
  68   scoped_ptr<gfx::Animation> fade_animation_;
  69   TabMediaState showing_media_state_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(MediaIndicatorButton);
  72 };
  73
  74 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_MEDIA_INDICATOR_BUTTON_H_