fdisk/range.js

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