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|
/*----------------------------------------------------------------------------\
| Range Class |
|-----------------------------------------------------------------------------|
| Created by Erik Arvidsson |
| (http://webfx.eae.net/contact.html#erik) |
| For WebFX (http://webfx.eae.net/) |
|-----------------------------------------------------------------------------|
| Used to model the data used when working with sliders, scrollbars and |
| progress bars. Based on the ideas of the javax.swing.BoundedRangeModel |
| interface defined by Sun for Java; http://java.sun.com/products/jfc/ |
| swingdoc-api-1.0.3/com/sun/java/swing/BoundedRangeModel.html |
|-----------------------------------------------------------------------------|
| Copyright (c) 2002, 2005, 2006 Erik Arvidsson |
|-----------------------------------------------------------------------------|
| Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| use this file except in compliance with the License. You may obtain a copy |
| of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| License for the specific language governing permissions and limitations |
| under the License. |
|-----------------------------------------------------------------------------|
| 2002-10-14 | Original version released |
| 2005-10-27 | Use Math.round instead of Math.floor |
| 2006-05-28 | Changed license to Apache Software License 2.0. |
|-----------------------------------------------------------------------------|
| Created 2002-10-14 | All changes are in the log above. | Updated 2006-05-28 |
\----------------------------------------------------------------------------*/
function Range() {
this._value = 0;
this._minimum = 0;
this._maximum = 100;
this._extent = 0;
this._isChanging = false;
}
Range.prototype.setValue = function (value) {
value = Math.round(parseFloat(value));
if (isNaN(value)) return;
if (this._value != value) {
if (value + this._extent > this._maximum)
this._value = this._maximum - this._extent;
else if (value < this._minimum)
this._value = this._minimum;
else
this._value = value;
if (!this._isChanging && typeof this.onchange == "function")
this.onchange();
}
};
Range.prototype.getValue = function () {
return this._value;
};
Range.prototype.setExtent = function (extent) {
if (this._extent != extent) {
if (extent < 0)
this._extent = 0;
else if (this._value + extent > this._maximum)
this._extent = this._maximum - this._value;
else
this._extent = extent;
if (!this._isChanging && typeof this.onchange == "function")
this.onchange();
}
};
Range.prototype.getExtent = function () {
return this._extent;
};
Range.prototype.setMinimum = function (minimum) {
if (this._minimum != minimum) {
var oldIsChanging = this._isChanging;
this._isChanging = true;
this._minimum = minimum;
if (minimum > this._value)
this.setValue(minimum);
if (minimum > this._maximum) {
this._extent = 0;
this.setMaximum(minimum);
this.setValue(minimum)
}
if (minimum + this._extent > this._maximum)
this._extent = this._maximum - this._minimum;
this._isChanging = oldIsChanging;
if (!this._isChanging && typeof this.onchange == "function")
this.onchange();
}
};
Range.prototype.getMinimum = function () {
return this._minimum;
};
Range.prototype.setMaximum = function (maximum) {
if (this._maximum != maximum) {
var oldIsChanging = this._isChanging;
this._isChanging = true;
this._maximum = maximum;
if (maximum < this._value)
this.setValue(maximum - this._extent);
if (maximum < this._minimum) {
this._extent = 0;
this.setMinimum(maximum);
this.setValue(this._maximum);
}
if (maximum < this._minimum + this._extent)
this._extent = this._maximum - this._minimum;
if (maximum < this._value + this._extent)
this._extent = this._maximum - this._value;
this._isChanging = oldIsChanging;
if (!this._isChanging && typeof this.onchange == "function")
this.onchange();
}
};
Range.prototype.getMaximum = function () {
return this._maximum;
};
|
