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