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third_party/google_input_tools/src/chrome/os/inputview/soundcontroller.js

-// Copyright 2014 The ChromeOS IME Authors. All Rights Reserved.
-// limitations under the License.
-// See the License for the specific language governing permissions and
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// distributed under the License is distributed on an "AS-IS" BASIS,
-// Unless required by applicable law or agreed to in writing, software
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// You may obtain a copy of the License at
-// you may not use this file except in compliance with the License.
-// Licensed under the Apache License, Version 2.0 (the "License");
-//
-goog.provide('i18n.input.chrome.inputview.SoundController');
-
-goog.require('goog.Disposable');
-goog.require('goog.dom');
-goog.require('i18n.input.chrome.inputview.Sounds');
-goog.require('i18n.input.chrome.inputview.elements.ElementType');
-
-goog.scope(function() {
-var Sounds = i18n.input.chrome.inputview.Sounds;
-var ElementType = i18n.input.chrome.inputview.elements.ElementType;
-var keyToSoundIdOnKeyUp = {};
-var keyToSoundIdOnKeyRepeat = {};
-
-
-/**
- * Sound controller for the keyboard.
- *
- * @param {!boolean} enabled Whether sounds is enabled by default.
- * @param {?number} opt_volume The default volume for sound tracks.
- * @constructor
- * @extends {goog.Disposable}
- */
-i18n.input.chrome.inputview.SoundController = function(enabled, opt_volume) {
-
-  /**
-   * Collection of all the sound pools.
-   *
-   * @type {!Object.<string, !Object>}
-   */
-  this.sounds_ = {};
-
-  this.enabled_ = enabled;
-
-  /**
-   * The default volume for all audio tracks. Tracks with volume 0 will be
-   * skipped.
-   *
-   * @type {number}
-   */
-  this.volume_ = opt_volume || this.DEFAULT_VOLUME;
-
-  if (enabled)
-    this.initialize();
-};
-goog.inherits(i18n.input.chrome.inputview.SoundController, goog.Disposable);
-
-
-var Controller = i18n.input.chrome.inputview.SoundController;
-
-
-/**
- * @define {number}  The size of the pool to use for playing audio sounds.
- */
-Controller.prototype.POOL_SIZE = 10;
-
-
-/**
- * @define {number}  The default audio track volume.
- */
-Controller.prototype.DEFAULT_VOLUME = 0.6;
-
-
-/**
- * Initializes the sound controller.
- */
-Controller.prototype.initialize = function() {
-  for (var sound in Sounds) {
-      this.addSound_(Sounds[sound]);
-  }
-  keyToSoundIdOnKeyUp[ElementType.BACKSPACE_KEY] = Sounds.NONE;
-  keyToSoundIdOnKeyUp[ElementType.ENTER_KEY] = Sounds.RETURN;
-  keyToSoundIdOnKeyUp[ElementType.SPACE_KEY] = Sounds.SPACEBAR;
-  keyToSoundIdOnKeyRepeat[ElementType.BACKSPACE_KEY] = Sounds.DELETE;
-};
-
-
-/**
- * Caches the specified sound on the keyboard.
- *
- * @param {string} soundId The name of the .wav file in the "sounds"
-     directory.
- * @private
- */
-Controller.prototype.addSound_ = function(soundId) {
-  if (soundId == Sounds.NONE || this.sounds_[soundId])
-    return;
-  var pool = [];
-  // Create sound pool.
-  for (var i = 0; i < this.POOL_SIZE; i++) {
-    var audio = goog.dom.createDom('audio', {
-      preload: 'auto',
-      id: soundId,
-      src: 'sounds/' + soundId + '.wav',
-      volume: this.volume_
-    });
-    pool.push(audio);
-  }
-  this.sounds_[soundId] = pool;
-};
-
-
-/**
- * Sets the volume for the specified sound.
- *
- * @param {string} soundId The id of the sound.
- * @param {number} volume The volume to set.
- */
-Controller.prototype.setVolume = function(soundId, volume) {
-  var pool = this.sounds_[soundId];
-  if (!pool) {
-    console.error('Cannot find sound: ' + soundId);
-    return;
-  }
-  // Change volume for all sounds in the pool.
-  for (var i = 0; i < pool.length; i++) {
-    pool[i].volume = volume;
-  }
-};
-
-
-/**
- * Enables or disable playing sounds on keypress.
- * @param {!boolean} enabled
- */
-Controller.prototype.setEnabled = function(enabled) {
-  this.enabled_ = enabled;
-  if (this.enabled_)
-    this.initialize();
-};
-
-
-/**
- * Sets the volume for all sounds on the keyboard.
- *
- * @param {number} volume The volume of the sounds.
- */
-Controller.prototype.setMasterVolume = function(volume) {
-  this.volume_ = volume;
-  for (var id in this.sounds_) {
-    this.setVolume(id, volume);
-  }
-};
-
-
-/**
- * Plays the specified sound.
- *
- * @param {string} soundId The id of the audio tag.
- * @private
- */
-Controller.prototype.playSound_ = function(soundId) {
-  // If master volume is zero, ignore the request.
-  if (!this.enabled_ || this.volume_ == 0 || soundId == Sounds.NONE)
-    return;
-  var pool = this.sounds_[soundId];
-  if (!pool) {
-    console.error('Cannot find sound: ' + soundId);
-    return;
-  }
-  // Search the sound pool for a free resource.
-  for (var i = 0; i < pool.length; i++) {
-    if (pool[i].paused) {
-      pool[i].play();
-      return;
-    }
-  }
-};
-
-
-/**
- * On key up.
- *
- * @param {ElementType} key The key released.
- */
- Controller.prototype.onKeyUp = function(key) {
-  var sound = keyToSoundIdOnKeyUp[key] || Sounds.STANDARD;
-  this.playSound_(sound);
- };
-
-
- /**
- * On key repeat.
- *
- * @param {ElementType} key The key that is being repeated.
- */
- Controller.prototype.onKeyRepeat = function(key) {
-  var sound = keyToSoundIdOnKeyRepeat[key] || Sounds.NONE;
-  this.playSound_(sound);
- };
-
-
- /** @override */
- Controller.prototype.disposeInternal = function() {
-  for (var soundId in this.sounds_) {
-    var pool = this.sounds_[soundId];
-    for (var i = 0; i < pool.length; i++) {
-      var tag = pool[i];
-      if (tag && tag.loaded) {
-        tag.pause();
-        tag.autoplay = false;
-        tag.loop = false;
-        tag.currentTime = 0;
-      }
-    }
-    delete this.sounds_[soundId];
-  }
-  this.sounds_ = {};
-  keyToSoundIdOnKeyUp = {};
-  keyToSoundIdOnKeyRepeat = {};
-  goog.base(this, 'disposeInternal');
- };
-
-});  // goog.scope