CrOS: Consolidate keydown handlers in the audio player.

Currently media keys break in tablet mode, but a 'space' keypress in
the same mode works fine. Media keys are in a separate handler that
probably lost its plumbing when shadow dom was introduced in r592709.

Merge the two key handlers into the one that works, and add a test
for 'MediaPlayPause'.

Adds a mapping for '[' and ']' to control tracks since its easier to
test and there's no prior mapping. (Cmd+Shift+][ are next/previous
tab in Chrome Mac).

Bug: 899094
Change-Id: Ie57b9b0d497b1996566ea3a1842309f0191d8bff
Reviewed-on: https://chromium-review.googlesource.com/c/1298820Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602965}

ui/file_manager/audio_player/elements/audio_player.js

@@ -7,6 +7,8 @@ Polymer({
 
   listeners: {
     'toggle-pause-event': 'onTogglePauseEvent_',
+    'next-track-event': 'onNextTrackEvent_',
+    'previous-track-event': 'onPreviousTrackEvent_',
     'small-forward-skip-event': 'onSmallForwardSkipEvent_',
     'small-backword-skip-event': 'onSmallBackwordSkipEvent_',
     'big-forward-skip-event': 'onBigForwardSkipEvent_',
@@ -80,8 +82,6 @@ Polymer({
    * element is ready.
    */
   ready: function() {
-    this.addEventListener('keydown', this.onKeyDown_.bind(this));
-
     this.$.audioController.addEventListener('dragging-changed',
         this.onDraggingChanged_.bind(this));
 
@@ -411,27 +411,6 @@ Polymer({
     }
   },
 
-  /**
-   * Invoked when the 'keydown' event is fired.
-   * @param {Event} event The event object.
-   */
-  onKeyDown_: function(event) {
-    switch (event.key) {
-      case 'MediaTrackNext':
-        this.onControllerNextClicked();
-        break;
-      case 'MediaPlayPause':
-        this.playing = !this.playing;
-        break;
-      case 'MediaTrackPrevious':
-        this.onControllerPreviousClicked();
-        break;
-      case 'MediaStop':
-        // TODO: Define "Stop" behavior.
-        break;
-    }
-  },
-
   /**
    * Computes volume value for audio element. (should be in [0.0, 1.0])
    * @param {number} volume Volume which is set in the UI. ([0, 100])
@@ -480,4 +459,14 @@ Polymer({
   onBigBackwordSkipEvent_: function(event) {
     this.$.audioController.bigSkip(false);
   },
+
+  /** @private */
+  onNextTrackEvent_: function(event) {
+    this.onControllerNextClicked();
+  },
+
+  /** @private */
+  onPreviousTrackEvent_: function(event) {
+    this.onControllerPreviousClicked();
+  },
 });

ui/file_manager/audio_player/js/audio_player.js

@@ -385,6 +385,7 @@ AudioPlayer.prototype.onKeyDown_ = function(event) {
 
     case ' ': // Space
     case 'k':
+    case 'MediaPlayPause':
       this.player_.dispatchEvent(new Event('toggle-pause-event'));
       break;
     case 'ArrowUp':
@@ -403,6 +404,17 @@ AudioPlayer.prototype.onKeyDown_ = function(event) {
     case 'j':
       this.player_.dispatchEvent(new Event('big-backword-skip-event'));
       break;
+    case ']':
+    case 'MediaTrackNext':
+      this.player_.dispatchEvent(new Event('next-track-event'));
+      break;
+    case '[':
+    case 'MediaTrackPrevious':
+      this.player_.dispatchEvent(new Event('previous-track-event'));
+      break;
+    case 'MediaStop':
+      // TODO: Define "Stop" behavior.
+      break;
   }
 };
 

ui/file_manager/integration_tests/audio_player/click_control_buttons.js

@@ -33,41 +33,75 @@ function controlPanelQuery(query) {
 testcase.togglePlayState = function() {
   var openAudio = launch('local', 'downloads', [ENTRIES.beautiful]);
   var appId;
-  return openAudio.then(function(args) {
-    appId = args[0];
-  }).then(function() {
-    // Audio player should start playing automatically,
-    return remoteCallAudioPlayer.waitForElement(
-        appId, 'audio-player[playing]');
-  }).then(function() {
-    // .. and the play button label should be 'Pause'.
-    return remoteCallAudioPlayer.waitForElement(
-        appId, [controlPanelQuery('#play[aria-label="Pause"]')]);
-  }).then(function() {
-    // Clicking on the play button should
-    return remoteCallAudioPlayer.callRemoteTestUtil(
-        'fakeMouseClick', appId, [controlPanelQuery('#play')]);
-  }).then(function() {
-    // ... change the audio playback state to pause,
-    return remoteCallAudioPlayer.waitForElement(
-        appId, 'audio-player:not([playing])');
-  }).then(function() {
-    // ... and the play button label should be 'Play'.
-    return remoteCallAudioPlayer.waitForElement(
-        appId, [controlPanelQuery('#play[aria-label="Play"]')]);
-  }).then(function() {
-    // Clicking on the play button again should
-    return remoteCallAudioPlayer.callRemoteTestUtil(
-        'fakeMouseClick', appId, [controlPanelQuery('#play')]);
-  }).then(function() {
-    // ... change the audio playback state to playing,
-    return remoteCallAudioPlayer.waitForElement(
-        appId, 'audio-player[playing]');
-  }).then(function() {
-    // ... and the play button label should be 'Pause'.
-    return remoteCallAudioPlayer.waitForElement(
-        appId, [controlPanelQuery('#play[aria-label="Pause"]')]);
-  });
+  return openAudio
+      .then(function(args) {
+        appId = args[0];
+      })
+      .then(function() {
+        // Audio player should start playing automatically,
+        return remoteCallAudioPlayer.waitForElement(
+            appId, 'audio-player[playing]');
+      })
+      .then(function() {
+        // .. and the play button label should be 'Pause'.
+        return remoteCallAudioPlayer.waitForElement(
+            appId, [controlPanelQuery('#play[aria-label="Pause"]')]);
+      })
+      .then(function() {
+
+        // First test a media key, before any element may have acquired focus.
+        return remoteCallAudioPlayer.fakeKeyDown(
+            appId, null, 'MediaPlayPause', false, false, false);
+      })
+      .then(function(result) {
+        chrome.test.assertTrue(!!result, 'fakeKeyDown failed.');
+        return remoteCallAudioPlayer.waitForElement(
+            appId, 'audio-player:not([playing])');
+      })
+      .then(function(element) {
+        chrome.test.assertTrue(!!element);
+        return remoteCallAudioPlayer.fakeKeyDown(
+            appId, null, 'MediaPlayPause', false, false, false);
+      })
+      .then(function(result) {
+        chrome.test.assertTrue(!!result, 'fakeKeyDown failed.');
+        return remoteCallAudioPlayer.waitForElement(
+            appId, 'audio-player[playing]');
+      })
+      .then(function(element) {
+        chrome.test.assertTrue(!!element);
+
+        // Clicking on the play button should Play.
+        return remoteCallAudioPlayer.callRemoteTestUtil(
+            'fakeMouseClick', appId, [controlPanelQuery('#play')]);
+      })
+      .then(function(result) {
+        chrome.test.assertTrue(!!result, 'fakeMouseClick failed.');
+        // ... change the audio playback state to pause,
+        return remoteCallAudioPlayer.waitForElement(
+            appId, 'audio-player:not([playing])');
+      })
+      .then(function() {
+        // ... and the play button label should be 'Play'.
+        return remoteCallAudioPlayer.waitForElement(
+            appId, [controlPanelQuery('#play[aria-label="Play"]')]);
+      })
+      .then(function() {
+        // Clicking on the play button again should
+        return remoteCallAudioPlayer.callRemoteTestUtil(
+            'fakeMouseClick', appId, [controlPanelQuery('#play')]);
+      })
+      .then(function(result) {
+        chrome.test.assertTrue(!!result, 'fakeMouseClick failed.');
+        // ... change the audio playback state to playing,
+        return remoteCallAudioPlayer.waitForElement(
+            appId, 'audio-player[playing]');
+      })
+      .then(function() {
+        // ... and the play button label should be 'Pause'.
+        return remoteCallAudioPlayer.waitForElement(
+            appId, [controlPanelQuery('#play[aria-label="Pause"]')]);
+      });
 };
 
 /**