Hotword Audio Verification App: Adds hotwording assets and basic opt-in flow.

chrome/browser/resources/hotword_audio_verification/flow.js

Index: chrome/browser/resources/hotword_audio_verification/flow.js
diff --git a/chrome/browser/resources/hotword_audio_verification/flow.js b/chrome/browser/resources/hotword_audio_verification/flow.js
new file mode 100644
index 0000000000000000000000000000000000000000..ed86efb8c4c4f9aa04dcf4a74abcfb5e6f747085
--- /dev/null
+++ b/chrome/browser/resources/hotword_audio_verification/flow.js
@@ -0,0 +1,87 @@
+// Copyright 2014 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.
+
+(function(context) {
+
+  // Correspond to steps in the hotword opt-in flow.
+  /** @const */ var HOTWORD_AUDIO_HISTORY = 'hotword-audio-history-container';
+  /** @const */ var HOTWORD_ONLY_START = 'hotword-only-container';
+  /** @const */ var AUDIO_HISTORY_START = 'audio-history-container';
+  /** @const */ var SPEECH_TRAINING = 'speech-training-container';
+  /** @const */ var ALL_SET = 'all-set-container';

[benwells, 2014/09/01 01:28:48]

Optional nit: when I first saw "ALL_SET" i thought it would be the set with all
things in it ... or something. Maybe rename this to "FINISHED" or something.

[Matt Giuca, 2014/09/01 05:35:43]

Yeah, as a general comment, a lot of things in this CL are named after the
(often colloquial) text used in the interface (like "all set", "no thanks",
"finish later" and "x"). It would be best to use ordinary programming
terminology in the variable, method and HTML id names, and just use the
colloquial terminology in the user-visible strings.

[kcarattini, 2014/09/01 06:59:06]

Acknowledged.

[kcarattini, 2014/09/01 06:59:06]

Done.

+
+  /** @const */ var FLOWS = {
+    HOTWORD_AND_AUDIO_HISTORY: [
+        HOTWORD_AUDIO_HISTORY, SPEECH_TRAINING, ALL_SET],
+    HOTWORD_ONLY: [HOTWORD_ONLY_START, SPEECH_TRAINING, ALL_SET],
+    AUDIO_HISTORY_ONLY: [AUDIO_HISTORY_START]
+  };
+
+  /**
+   * Class to control the page flow of the always-on hotword and
+   * Audio History opt-in process.
+   * @constructor
+   */
+  function Flow() {
+    this.currentStepIndex_ = -1;
+    this.currentFlow_ = [];
+  }
+
+  /**
+   * Gets the appropriate flow and displays its first page.
+   */
+  Flow.prototype.startFlow = function() {
+    this.currentFlow_ = getFlowForSetting_.apply(this);
+    this.advanceStep();
+  };
+
+  /**
+   * Advances the current step.
+   * @return {boolean} true if we have not reached the end of the flow.
+   */
+  Flow.prototype.advanceStep = function() {
+    if (this.currentStepIndex_ >= 0) {
+      this.currentStepIndex_++;
+      if (this.currentStepIndex_ > this.currentFlow_.length) {
+        return false;
+      }
+    } else {
+      this.currentStepIndex_ = 0;
+    }
+
+    showStep_.apply(this);
+    return true;
+  };
+
+  // ---- private methods:
+
+  /**
+   * Gets the appropriate flow for the current configuration of settings.
+   * @private
+   */
+  getFlowForSetting_ = function() {
+    // TODO(kcarattini): This should eventually return the correct flow for
+    // the current settings state.
+    return FLOWS.HOTWORD_AND_AUDIO_HISTORY;
+  };
+
+  /**
+   * Displays the current step. If the current step is not the first step.
+   * also hides the previous step.
+   * @private
+   */
+  showStep_ = function() {
+    var currentStep = this.currentFlow_[this.currentStepIndex_];
+    var previousStep = null;
+    if (this.currentStepIndex_ > 0)
+      previousStep = this.currentFlow_[this.currentStepIndex_ - 1];
+
+    if (previousStep)
+      document.getElementById(previousStep).hidden = true;
+
+    document.getElementById(currentStep).hidden = false;
+  };
+
+  window.Flow = Flow;
+})(window);