Home | History | Annotate | Download | only in tabs 
      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   virtual ~MediaIndicatorButton();
     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   virtual const char* GetClassName() const OVERRIDE;
     48   virtual View* GetTooltipHandlerForPoint(const gfx::Point& point) OVERRIDE;
     49   virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
     50   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
     51 
     52   // views::ViewTargeterDelegate
     53   virtual bool DoesIntersectRect(const View* target,
     54                                  const gfx::Rect& rect) const OVERRIDE;
     55 
     56   // views::Button:
     57   virtual void NotifyClick(const ui::Event& event) OVERRIDE;
     58 
     59  private:
     60   class FadeAnimationDelegate;
     61 
     62   TabMediaState media_state_;
     63 
     64   // Media indicator fade-in/out animation (i.e., only on show/hide, not a
     65   // continuous animation).
     66   scoped_ptr<gfx::AnimationDelegate> fade_animation_delegate_;
     67   scoped_ptr<gfx::Animation> fade_animation_;
     68   TabMediaState showing_media_state_;
     69 
     70   DISALLOW_COPY_AND_ASSIGN(MediaIndicatorButton);
     71 };
     72 
     73 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_MEDIA_INDICATOR_BUTTON_H_
     74