Improve caption button behavior for video player.

third_party/WebKit/Source/core/html/shadow/MediaControls.cpp

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
 #include "core/html/shadow/MediaControls.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/ClientRect.h"
 #include "core/dom/Fullscreen.h"
 #include "core/events/MouseEvent.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/shadow/MediaControlsWindowEventListener.h"
 #include "core/html/track/TextTrackContainer.h"
+#include "core/html/track/TextTrackList.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutTheme.h"
 #include "platform/EventDispatchForbiddenScope.h"
 
 namespace blink {
 
 // If you change this value, then also update the corresponding value in
 // LayoutTests/media/media-controls.js.
 static const double timeWithoutMouseMovementBeforeHidingMediaControls = 3;
 
@@ skipping 502 matching lines @@
     m_textTrackList->setVisible(false);
     return;
   }
 
   if (!m_textTrackList->isWanted())
     m_windowEventListener->start();
 
   m_textTrackList->setVisible(!m_textTrackList->isWanted());
 }
 
+void MediaControls::showTextTrackAtIndex(unsigned indexToEnable) {
+  TextTrackList* trackList = mediaElement().textTracks();
+  if (indexToEnable >= trackList->length())
+    return;
+  TextTrack* track = trackList->anonymousIndexedGetter(indexToEnable);
+  if (track && track->canBeRendered())
+    track->setMode(TextTrack::showingKeyword());
+}
+
+void MediaControls::disableShowingTextTracks() {
+  TextTrackList* trackList = mediaElement().textTracks();
+  for (unsigned i = 0; i < trackList->length(); ++i) {
+    TextTrack* track = trackList->anonymousIndexedGetter(i);
+    if (track->mode() == TextTrack::showingKeyword())
+      track->setMode(TextTrack::disabledKeyword());
+  }
+}
+
 void MediaControls::refreshCastButtonVisibility() {
   refreshCastButtonVisibilityWithoutUpdate();
   BatchedControlUpdate batch(this);
 }
 
 void MediaControls::refreshCastButtonVisibilityWithoutUpdate() {
   if (!shouldShowCastButton(mediaElement())) {
     m_castButton->setIsWanted(false);
     m_overlayCastButton->setIsWanted(false);
     return;
@@ skipping 350 matching lines @@
   visitor->trace(m_textTrackList);
   visitor->trace(m_overflowMenu);
   visitor->trace(m_overflowList);
   visitor->trace(m_castButton);
   visitor->trace(m_overlayCastButton);
   visitor->trace(m_windowEventListener);
   HTMLDivElement::trace(visitor);
 }
 
 }  // namespace blink