Fix cast receiver idle behavior

When we replay a video without reloading, the idle card should disappear.

Closes #558

Change-Id: Ib2bca456ad90c8f2b4554f22f1edb920c69c8ada

lib/cast/cast_receiver.js

@@ -163,10 +163,19 @@ shaka.cast.CastReceiver.prototype.init_ = function() {
 
   // Maintain idle state.
   this.player_.addEventListener('loading', function() {
+    // No longer idle once loading.  This allows us to show the spinner during
+    // the initial buffering phase.
+    this.isIdle_ = false;
+    this.onCastStatusChanged_();
+  }.bind(this));
+  this.video_.addEventListener('playing', function() {
+    // No longer idle once playing.  This allows us to replay a video without
+    // reloading.
     this.isIdle_ = false;
     this.onCastStatusChanged_();
   }.bind(this));
   this.player_.addEventListener('unloading', function() {
+    // Go idle when unloading content.
     this.isIdle_ = true;
     this.onCastStatusChanged_();
   }.bind(this));

test/cast/cast_receiver_unit.js

@@ -166,24 +166,39 @@ describe('CastReceiver', function() {
       var fakeLoadingEvent = {type: 'loading'};
       var fakeUnloadingEvent = {type: 'unloading'};
       var fakeEndedEvent = {type: 'ended'};
+      var fakePlayingEvent = {type: 'playing'};
 
       shaka.test.Util.delay(0.2).then(function() {
         expect(listener).not.toHaveBeenCalled();
+        expect(receiver.isIdle()).toBe(true);
+
         mockPlayer.listeners['loading'](fakeLoadingEvent);
         return shaka.test.Util.delay(0.2);
       }).then(function() {
         expect(listener).toHaveBeenCalled();
+        expect(receiver.isIdle()).toBe(false);
         listener.calls.reset();
+
         mockPlayer.listeners['unloading'](fakeUnloadingEvent);
         return shaka.test.Util.delay(0.2);
       }).then(function() {
         expect(listener).toHaveBeenCalled();
+        expect(receiver.isIdle()).toBe(true);
         listener.calls.reset();
+
         mockVideo.ended = true;
         mockVideo.listeners['ended'](fakeEndedEvent);
         return shaka.test.Util.delay(5.2);  // There is a long delay for 'ended'
       }).then(function() {
         expect(listener).toHaveBeenCalled();
+        listener.calls.reset();
+        expect(receiver.isIdle()).toBe(true);
+
+        mockVideo.ended = false;
+        mockVideo.listeners['playing'](fakePlayingEvent);
+      }).then(function() {
+        expect(listener).toHaveBeenCalled();
+        expect(receiver.isIdle()).toBe(false);
       }).catch(fail).then(done);
     });
   });