Support text track selection in video controls

third_party/WebKit/Source/core/html/shadow/MediaControlElements.h

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 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.
@@ skipping 16 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef MediaControlElements_h
 #define MediaControlElements_h
 
 #include "core/html/shadow/MediaControlElementTypes.h"
 
 namespace blink {
 
+class TextTrack;
+
 // ----------------------------
 
 class MediaControlPanelElement final : public MediaControlDivElement {
 public:
     static MediaControlPanelElement* create(MediaControls&);
 
     void setIsDisplayed(bool);
 
     void makeOpaque();
     void makeTransparent();
@@ skipping 92 matching lines @@
     void updateDisplayType() override;
 
 private:
     explicit MediaControlToggleClosedCaptionsButtonElement(MediaControls&);
 
     void defaultEventHandler(Event*) override;
 };
 
 // ----------------------------
 
+class MediaControlTextTrackListElement final : public MediaControlDivElement {
+public:
+    static MediaControlTextTrackListElement* create(MediaControls&);
+
+    bool willRespondToMouseClickEvents() override { return true; }
+
+    void setVisible(bool);
+
+private:
+    explicit MediaControlTextTrackListElement(MediaControls&);
+
+    void defaultEventHandler(Event*) override;
+
+    void refreshTextTrackListMenu();
+
+    bool hasDuplicateLabel(const TextTrack& currentTrack);

[philipj_slow, 2016/04/20 15:27:22]

This can be in the .cpp file only, in an anonymous namespace, like
preloadTypeToString and others in HTMLMediaElement.cpp.

+    // Returns the label for the track when a valid track is passed in and "Off" when the parameter is null.
+    String getTextTrackLabel(TextTrack*);
+    // Creates the track element in the list when a valid track is passed in and the "Off" item when the parameter is null.
+    Element* createTextTrackListItem(TextTrack*);
+
+    void showTextTrackAtIndex(unsigned);
+    void disableShowingTextTracks();
+};
+
+// ----------------------------
+
 class MediaControlTimelineElement final : public MediaControlInputElement {
 public:
     static MediaControlTimelineElement* create(MediaControls&);
 
     bool willRespondToMouseClickEvents() override;
 
     // FIXME: An "earliest possible position" will be needed once that concept
     // is supported by HTMLMediaElement, see https://crbug.com/137275
     void setPosition(double);
     void setDuration(double);
@@ skipping 93 matching lines @@
 public:
     static MediaControlCurrentTimeDisplayElement* create(MediaControls&);
 
 private:
     explicit MediaControlCurrentTimeDisplayElement(MediaControls&);
 };
 
 } // namespace blink
 
 #endif // MediaControlElements_h