Revert of AudioPlayer: Update volume controls.

ui/file_manager/audio_player/elements/volume_controller.js

+// 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() {
+  'use strict';
+
+  Polymer({
+    is: 'volume-controller',
+
+    properties: {
+      /**
+       * Width of the element in pixels. Must be specified before ready() is
+       * called. Dynamic change is not supported.
+       * @type {number}
+       */
+      width: {
+        type: Number,
+        value: 32
+      },
+
+      /**
+       * Height of the element in pixels. Must be specified before ready() is
+       * called. Dynamic change is not supported.
+       * @type {number}
+       */
+      height: {
+        type: Number,
+        value: 100
+      },
+
+      /**
+       * Volume. 0 is silent, and 100 is maximum.
+       * @type {number}
+       */
+      value: {
+        type: Number,
+        value: 50,
+        observer: 'valueChanged',
+        notify: true
+      },
+
+      /**
+       * Volume. 100 is silent, and 0 is maximum.
+       * @type {number}
+       */
+      rawValue: {
+        type: Number,
+        value: 0,
+        observer: 'rawValueChanged',
+        notify: true
+      }
+    },
+
+    /**
+     * Initializes an element. This method is called automatically when the
+     * element is ready.
+     */
+    ready: function() {
+      this.style.width = this.width + 'px';
+      this.style.height = this.height + 'px';
+
+      this.rawValueInput = this.$.rawValueInput;
+      this.bar = this.$.bar;
+
+      this.rawValueInput.style.width = this.height + 'px';
+      this.rawValueInput.style.height = this.width + 'px';
+      this.rawValueInput.style.webkitTransformOrigin =
+          (this.width / 2) + 'px ' +
+          (this.width / 2 - 2) + 'px';
+
+      var barLeft = (this.width / 2 - 1);
+      this.bar.style.left = barLeft + 'px';
+      this.bar.style.right = barLeft + 'px';
+
+      this.addEventListener('keydown', this.onKeyDown_.bind(this));
+    },
+
+    /**
+     * Invoked when the 'volume' value is changed.
+     * @param {number} newValue New value.
+     * @param {number} oldValue Old value.
+     */
+    valueChanged: function(newValue, oldValue) {
+      if (oldValue != newValue)
+        this.rawValue = 100 - newValue;
+    },
+
+    /**
+     * Invoked when the 'rawValue' property is changed.
+     * @param {number} newValue New value.
+     * @param {number} oldValue Old value.
+     */
+    rawValueChanged: function(newValue, oldValue) {
+      if (oldValue !== newValue)
+        this.value = 100 - newValue;
+    },
+
+    /**
+     * Invoked when the 'keydown' event is fired.
+     * @param {Event} event The event object.
+     */
+    onKeyDown_: function(event) {
+      switch (event.keyIdentifier) {
+        // Prevents the default behavior. These key should be handled in
+        // <audio-player> element.
+        case 'Up':
+        case 'Down':
+        case 'PageUp':
+        case 'PageDown':
+          event.preventDefault();
+          break;
+      }
+    },
+
+    /**
+     * Computes style for '.filled' element based on raw value.
+     * @return {string}
+     */
+    computeFilledStyle_: function(rawValue) {
+      return 'height: ' + rawValue + '%;';
+    }
+  });
+})();  // Anonymous closure