slider/js/range.js

   1 /*----------------------------------------------------------------------------\\r
   2 |                                Range Class                                  |\r
   3 |-----------------------------------------------------------------------------|\r
   4 |                         Created by Erik Arvidsson                           |\r
   5 |                  (http://webfx.eae.net/contact.html#erik)                   |\r
   6 |                      For WebFX (http://webfx.eae.net/)                      |\r
   7 |-----------------------------------------------------------------------------|\r
   8 | Used to  model the data  used  when working  with  sliders,  scrollbars and |\r
   9 | progress bars.  Based  on  the  ideas of  the javax.swing.BoundedRangeModel |\r
  10 | interface  defined  by  Sun  for  Java;   http://java.sun.com/products/jfc/ |\r
  11 | swingdoc-api-1.0.3/com/sun/java/swing/BoundedRangeModel.html                |\r
  12 |-----------------------------------------------------------------------------|\r
  13 |                Copyright (c) 2002, 2005, 2006 Erik Arvidsson                |\r
  14 |-----------------------------------------------------------------------------|\r
  15 | Licensed under the Apache License, Version 2.0 (the "License"); you may not |\r
  16 | use this file except in compliance with the License.  You may obtain a copy |\r
  17 | of the License at http://www.apache.org/licenses/LICENSE-2.0                |\r
  18 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |\r
  19 | Unless  required  by  applicable law or  agreed  to  in  writing,  software |\r
  20 | distributed under the License is distributed on an  "AS IS" BASIS,  WITHOUT |\r
  21 | WARRANTIES OR  CONDITIONS OF ANY KIND,  either express or implied.  See the |\r
  22 | License  for the  specific language  governing permissions  and limitations |\r
  23 | under the License.                                                          |\r
  24 |-----------------------------------------------------------------------------|\r
  25 | 2002-10-14 | Original version released                                      |\r
  26 | 2005-10-27 | Use Math.round instead of Math.floor                           |\r
  27 | 2006-05-28 | Changed license to Apache Software License 2.0.                |\r
  28 |-----------------------------------------------------------------------------|\r
  29 | Created 2002-10-14 | All changes are in the log above. | Updated 2006-05-28 |\r
  30 \----------------------------------------------------------------------------*/\r
  31 \r
  32 \r
  33 function Range() {\r
  34         this._value = 0;\r
  35         this._minimum = 0;\r
  36         this._maximum = 100;\r
  37         this._extent = 0;\r
  38 \r
  39         this._isChanging = false;\r
  40 }\r
  41 \r
  42 Range.prototype.setValue = function (value) {\r
  43         value = Math.round(parseFloat(value));\r
  44         if (isNaN(value)) return;\r
  45         if (this._value != value) {\r
  46                 if (value + this._extent > this._maximum)\r
  47                         this._value = this._maximum - this._extent;\r
  48                 else if (value < this._minimum)\r
  49                         this._value = this._minimum;\r
  50                 else\r
  51                         this._value = value;\r
  52                 if (!this._isChanging && typeof this.onchange == "function")\r
  53                          this.onchange();\r
  54         }\r
  55 };\r
  56 \r
  57 Range.prototype.getValue = function () {\r
  58         return this._value;\r
  59 };\r
  60 \r
  61 Range.prototype.setExtent = function (extent) {\r
  62         if (this._extent != extent) {\r
  63                 if (extent < 0)\r
  64                         this._extent = 0;\r
  65                 else if (this._value + extent > this._maximum)\r
  66                         this._extent = this._maximum - this._value;\r
  67                 else\r
  68                         this._extent = extent;\r
  69                 if (!this._isChanging && typeof this.onchange == "function")\r
  70                         this.onchange();\r
  71         }\r
  72 };\r
  73 \r
  74 Range.prototype.getExtent = function () {\r
  75         return this._extent;\r
  76 };\r
  77 \r
  78 Range.prototype.setMinimum = function (minimum) {\r
  79         if (this._minimum != minimum) {\r
  80                 var oldIsChanging = this._isChanging;\r
  81                 this._isChanging = true;\r
  82 \r
  83                 this._minimum = minimum;\r
  84 \r
  85                 if (minimum > this._value)\r
  86                         this.setValue(minimum);\r
  87                 if (minimum > this._maximum) {\r
  88                         this._extent = 0;\r
  89                         this.setMaximum(minimum);\r
  90                         this.setValue(minimum)\r
  91                 }\r
  92                 if (minimum + this._extent > this._maximum)\r
  93                         this._extent = this._maximum - this._minimum;\r
  94 \r
  95                 this._isChanging = oldIsChanging;\r
  96                 if (!this._isChanging && typeof this.onchange == "function")\r
  97                         this.onchange();\r
  98         }\r
  99 };\r
 100 \r
 101 Range.prototype.getMinimum = function () {\r
 102         return this._minimum;\r
 103 };\r
 104 \r
 105 Range.prototype.setMaximum = function (maximum) {\r
 106         if (this._maximum != maximum) {\r
 107                 var oldIsChanging = this._isChanging;\r
 108                 this._isChanging = true;\r
 109 \r
 110                 this._maximum = maximum;\r
 111 \r
 112                 if (maximum < this._value)\r
 113                         this.setValue(maximum - this._extent);\r
 114                 if (maximum < this._minimum) {\r
 115                         this._extent = 0;\r
 116                         this.setMinimum(maximum);\r
 117                         this.setValue(this._maximum);\r
 118                 }\r
 119                 if (maximum < this._minimum + this._extent)\r
 120                         this._extent = this._maximum - this._minimum;\r
 121                 if (maximum < this._value + this._extent)\r
 122                         this._extent = this._maximum - this._value;\r
 123 \r
 124                 this._isChanging = oldIsChanging;\r
 125                 if (!this._isChanging && typeof this.onchange == "function")\r
 126                         this.onchange();\r
 127         }\r
 128 };\r
 129 \r
 130 Range.prototype.getMaximum = function () {\r
 131         return this._maximum;\r
 132 };\r