remoting/webapp/base/js/client_plugin_host_desktop_impl.js

   1 // Copyright 2015 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  * Provides an interface to manage the Host Desktop of a remoting session.
   8  */
   9
  10 var remoting = remoting || {};
  11 remoting.ClientPlugin = remoting.ClientPlugin || {};
  12
  13 (function() {
  14
  15 'use strict';
  16
  17 /**
  18  * @param {remoting.ClientPlugin} plugin
  19  * @param {function(Object):void} postMessageCallback Callback to post a message
  20  *   to the Client Plugin.
  21  *
  22  * @implements {remoting.HostDesktop}
  23  * @extends {base.EventSourceImpl}
  24  * @constructor
  25  */
  26 remoting.ClientPlugin.HostDesktopImpl = function(plugin, postMessageCallback) {
  27   base.inherits(this, base.EventSourceImpl);
  28   /** @private */
  29   this.plugin_ = plugin;
  30   /** @private */
  31   this.width_ = 0;
  32   /** @private */
  33   this.height_ = 0;
  34   /** @private */
  35   this.xDpi_ = 96;
  36   /** @private */
  37   this.yDpi_ = 96;
  38   /** @private */
  39   this.postMessageCallback_ = postMessageCallback;
  40
  41   this.defineEvents(base.values(remoting.HostDesktop.Events));
  42 };
  43
  44 /** @return {{width:number, height:number, xDpi:number, yDpi:number}} */
  45 remoting.ClientPlugin.HostDesktopImpl.prototype.getDimensions = function() {
  46   return {
  47     width: this.width_,
  48     height: this.height_,
  49     xDpi: this.xDpi_,
  50     yDpi: this.yDpi_
  51   };
  52 };
  53
  54 /**
  55  * @param {number} width
  56  * @param {number} height
  57  * @param {number} deviceScale
  58  */
  59 remoting.ClientPlugin.HostDesktopImpl.prototype.resize = function(
  60     width, height, deviceScale) {
  61   var dpi = Math.floor(deviceScale * 96);
  62   this.postMessageCallback_({
  63     method: 'notifyClientResolution',
  64     data: {
  65       width: Math.floor(width * deviceScale),
  66       height: Math.floor(height * deviceScale),
  67       x_dpi: dpi,
  68       y_dpi: dpi
  69     }
  70   });
  71 };
  72
  73 /**
  74  * This function is called by |this.plugin_| when the size of the host
  75  * desktop is changed.
  76  *
  77  * @param {remoting.ClientPluginMessage} message
  78  */
  79 remoting.ClientPlugin.HostDesktopImpl.prototype.onSizeUpdated = function(
  80     message) {
  81   this.width_ = base.getNumberAttr(message.data, 'width');
  82   this.height_ = base.getNumberAttr(message.data, 'height');
  83   this.xDpi_ = base.getNumberAttr(message.data, 'x_dpi', 96);
  84   this.yDpi_ = base.getNumberAttr(message.data, 'y_dpi', 96);
  85   this.raiseEvent(remoting.HostDesktop.Events.sizeChanged,
  86                   this.getDimensions());
  87 };
  88
  89 /**
  90  * This function is called by |this.plugin_| when the shape of the host
  91  * desktop is changed.
  92  *
  93  * @param {remoting.ClientPluginMessage} message
  94  * @return {Array<{left:number, top:number, width:number, height:number}>}
  95  *    rectangles of the desktop shape.
  96  */
  97 remoting.ClientPlugin.HostDesktopImpl.prototype.onShapeUpdated =
  98     function(message) {
  99   var shapes = base.getArrayAttr(message.data, 'rects');
 100   var rects = shapes.map(
 101     /** @param {Array<number>} shape */
 102     function(shape) {
 103       if (!Array.isArray(shape) || shape.length != 4) {
 104         throw 'Received invalid onDesktopShape message';
 105       }
 106       var rect = {};
 107       rect.left = shape[0];
 108       rect.top = shape[1];
 109       rect.width = shape[2];
 110       rect.height = shape[3];
 111       return rect;
 112   });
 113
 114   this.raiseEvent(remoting.HostDesktop.Events.shapeChanged, rects);
 115   return rects;
 116 };
 117
 118 }());