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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 /**
      6  * @fileoverview
      7  * Class representing the client tool-bar.
      8  */
      9 
     10 'use strict';
     11 
     12 /** @suppress {duplicate} */
     13 var remoting = remoting || {};
     14 
     15 /**
     16  * @param {HTMLElement} toolbar The HTML element representing the tool-bar.
     17  * @constructor
     18  */
     19 remoting.Toolbar = function(toolbar) {
     20   /**
     21    * @type {HTMLElement}
     22    * @private
     23    */
     24   this.toolbar_ = toolbar;
     25   /**
     26    * @type {HTMLElement}
     27    * @private
     28    */
     29   this.stub_ = /** @type {HTMLElement} */toolbar.querySelector('.toolbar-stub');
     30   /**
     31    * @type {number?} The id of the preview timer, if any.
     32    * @private
     33    */
     34   this.timerId_ = null;
     35   /**
     36    * @type {number} The left edge of the tool-bar stub, updated on resize.
     37    * @private
     38    */
     39   this.stubLeft_ = 0;
     40   /**
     41    * @type {number} The right edge of the tool-bar stub, updated on resize.
     42    * @private
     43    */
     44   this.stubRight_ = 0;
     45 
     46   window.addEventListener('mousemove', remoting.Toolbar.onMouseMove, false);
     47   window.addEventListener('resize', this.center.bind(this), false);
     48 
     49   // Prevent the preview canceling if the user is interacting with the tool-bar.
     50   /** @type {remoting.Toolbar} */
     51   var that = this;
     52   var stopTimer = function() {
     53     if (that.timerId_) {
     54       window.clearTimeout(that.timerId_);
     55       that.timerId_ = null;
     56     }
     57   }
     58   this.toolbar_.addEventListener('mousemove', stopTimer, false);
     59 };
     60 
     61 /**
     62  * Preview the tool-bar functionality by showing it for 3s.
     63  * @return {void} Nothing.
     64  */
     65 remoting.Toolbar.prototype.preview = function() {
     66   this.toolbar_.classList.add(remoting.Toolbar.VISIBLE_CLASS_);
     67   if (this.timerId_) {
     68     window.clearTimeout(this.timerId_);
     69     this.timerId_ = null;
     70   }
     71   var classList = this.toolbar_.classList;
     72   this.timerId_ = window.setTimeout(
     73       classList.remove.bind(classList, remoting.Toolbar.VISIBLE_CLASS_),
     74       3000);
     75 };
     76 
     77 /**
     78  * Center the tool-bar horizonally.
     79  */
     80 remoting.Toolbar.prototype.center = function() {
     81   var toolbarX = (window.innerWidth - this.toolbar_.clientWidth) / 2;
     82   this.toolbar_.style['left'] = toolbarX + 'px';
     83   var r = this.stub_.getBoundingClientRect();
     84   this.stubLeft_ = r.left;
     85   this.stubRight_ = r.right;
     86 };
     87 
     88 /**
     89  * Toggle the tool-bar visibility.
     90  */
     91 remoting.Toolbar.prototype.toggle = function() {
     92   this.toolbar_.classList.toggle(remoting.Toolbar.VISIBLE_CLASS_);
     93 };
     94 
     95 /**
     96  * Test the specified co-ordinate to see if it is close enough to the stub
     97  * to activate it.
     98  *
     99  * @param {number} x The x co-ordinate.
    100  * @param {number} y The y co-ordinate.
    101  * @return {boolean} True if the position should activate the tool-bar stub, or
    102  *     false otherwise.
    103  * @private
    104  */
    105 remoting.Toolbar.prototype.hitTest_ = function(x, y) {
    106   var threshold = 50;
    107   return (x >= this.stubLeft_ - threshold &&
    108           x <= this.stubRight_ + threshold &&
    109           y < threshold);
    110 };
    111 
    112 /**
    113  * Called whenever the mouse moves in the document. This is used to make the
    114  * active area of the tool-bar stub larger without making a corresponding area
    115  * of the host screen inactive.
    116  *
    117  * @param {Event} event The mouse move event.
    118  * @return {void} Nothing.
    119  */
    120 remoting.Toolbar.onMouseMove = function(event) {
    121   if (remoting.toolbar) {
    122     var toolbarStub = remoting.toolbar.stub_;
    123     if (remoting.toolbar.hitTest_(event.x, event.y)) {
    124       toolbarStub.classList.add(remoting.Toolbar.STUB_EXTENDED_CLASS_);
    125     } else {
    126       toolbarStub.classList.remove(remoting.Toolbar.STUB_EXTENDED_CLASS_);
    127     }
    128   } else {
    129     document.removeEventListener('mousemove',
    130                                  remoting.Toolbar.onMouseMove, false);
    131   }
    132 };
    133 
    134 /** @type {remoting.Toolbar} */
    135 remoting.toolbar = null;
    136 
    137 /** @private */
    138 remoting.Toolbar.STUB_EXTENDED_CLASS_ = 'toolbar-stub-extended';
    139 /** @private */
    140 remoting.Toolbar.VISIBLE_CLASS_ = 'toolbar-visible';
    141