cros: Allow user to configure note taking app in md-settings.

chrome/browser/resources/settings/device_page/stylus.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * 'settings-stylus' is the settings subpage with stylus-specific settings.
  */
 
+/** @const */ var FIND_MORE_APPS_URL =
+    'https://play.google.com/store/apps/collection/promotion_30023cb_stylus_apps';

[stevenjb, 2017/01/19 17:48:53]

Use '+' and multiple strings to avoid wrapping.

[jdufault, 2017/01/25 00:52:22]

Done.

+
 Polymer({
   is: 'settings-stylus',
 
   properties: {
     /** Preferences state. */
     prefs: {
       type: Object,
       notify: true,
     },
-  }
+
+    /**
+     * Note taking apps the user can pick between.
+     * @type {Array<{name:string, value:string, preferred:boolean}>}
+     * @private
+     */
+    appChoices_: [],

[stevenjb, 2017/01/19 17:48:53]

appChoices_ : {
  type: Array,
  value: function() { return []; },
},

Otherwise all instances of this element will share the same array.

[jdufault, 2017/01/25 00:52:22]

Done, since this makes it clearer. However, we never actually modify the given
array so it should be okay either way.

+
+    /**
+     * True if the arc++ container has not finished starting yet.

[Daniel Erat, 2017/01/19 00:50:05]

nit: i think i read/heard somewhere that we just call it "ARC" now

[jdufault, 2017/01/25 00:52:22]

Done.

+     * @type {boolean}

[stevenjb, 2017/01/19 17:48:53]

not needed, see below.

[jdufault, 2017/01/25 00:52:22]

Done.

+     * @private
+     */
+    waitingForAndroid_: false,

[stevenjb, 2017/01/19 17:48:53]

waitingForAndroid_: {
  type: Boolean,
  value: false,
}

[jdufault, 2017/01/25 00:52:22]

Done. It's strange that if closure can understand this pattern it cannot
undertand `waitingForAndroid_: false`.

+  },
+
+  ready: function() {
+    cr.addWebUIListener(
+      'onNoteTakingAppsUpdated',
+      this.onNoteAppsUpdated_.bind(this));
+
+    chrome.send('requestNoteTakingApps');

[stevenjb, 2017/01/19 17:48:53]

In order to test this we will want to set up a proxy class (or use an existing
one). See device_page_browser_proxy.js.

[jdufault, 2017/01/25 00:52:22]

Done.

+  },
+
+  /** @private */
+  onSelectedAppChanged_: function() {
+    chrome.send('setPreferredNoteTakingApp', [this.$.menu.value]);
+  },
+
+  /** @private */

[stevenjb, 2017/01/19 17:48:53]

Need @type for all args

[jdufault, 2017/01/25 00:52:22]

Done.

+  onNoteAppsUpdated_: function(apps, waitingForAndroid) {
+    this.waitingForAndroid_ = waitingForAndroid;
+    this.appChoices_ = apps;
+  },
+
+  /** @private */
+  showNoApps_: function(apps, waitingForAndroid) {
+    return apps.length == 0 && !waitingForAndroid;
+  },
+
+  /** @private */
+  showApps_: function(apps, waitingForAndroid) {
+    return apps.length > 0 && !waitingForAndroid;
+  },
+
+  /** @private */
+  onFindAppsTap_: function() {
+    window.open(FIND_MORE_APPS_URL);
+  },
 });