158 lines
5.4 KiB
JavaScript
158 lines
5.4 KiB
JavaScript
// Copyright 2007 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// 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,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Twothumbslider is a slider that allows to select a subrange
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* within a range by dragging two thumbs. The selected sub-range is exposed
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* through getValue() and getExtent().
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*
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* To decorate, the twothumbslider should be bound to an element with the class
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* name 'goog-twothumbslider-[vertical / horizontal]' containing children with
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* the classname 'goog-twothumbslider-value-thumb' and
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* 'goog-twothumbslider-extent-thumb', respectively.
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*
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* Decorate Example:
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* <div id="twothumbslider" class="goog-twothumbslider-horizontal">
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* <div class="goog-twothumbslider-value-thumb">
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* <div class="goog-twothumbslider-extent-thumb">
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* </div>
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* <script>
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*
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* var slider = new goog.ui.TwoThumbSlider;
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* slider.decorate(document.getElementById('twothumbslider'));
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*
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* TODO(user): add a11y once we know what this element is
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*
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* @see ../demos/twothumbslider.html
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*/
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goog.provide('goog.ui.TwoThumbSlider');
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goog.require('goog.a11y.aria');
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goog.require('goog.a11y.aria.Role');
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goog.require('goog.dom');
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goog.require('goog.ui.SliderBase');
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/**
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* This creates a TwoThumbSlider object.
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* @param {goog.dom.DomHelper=} opt_domHelper Optional DOM helper.
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* @constructor
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* @extends {goog.ui.SliderBase}
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*/
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goog.ui.TwoThumbSlider = function(opt_domHelper) {
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goog.ui.SliderBase.call(this, opt_domHelper);
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this.rangeModel.setValue(this.getMinimum());
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this.rangeModel.setExtent(this.getMaximum() - this.getMinimum());
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};
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goog.inherits(goog.ui.TwoThumbSlider, goog.ui.SliderBase);
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/**
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* The prefix we use for the CSS class names for the slider and its elements.
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* @type {string}
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*/
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goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX =
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goog.getCssName('goog-twothumbslider');
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/**
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* CSS class name for the value thumb element.
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* @type {string}
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*/
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goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS =
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goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'value-thumb');
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/**
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* CSS class name for the extent thumb element.
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* @type {string}
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*/
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goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS =
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goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'extent-thumb');
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/**
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* CSS class name for the range highlight element.
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* @type {string}
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*/
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goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS =
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goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'rangehighlight');
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/**
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* @param {goog.ui.SliderBase.Orientation} orient orientation of the slider.
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* @return {string} The CSS class applied to the twothumbslider element.
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* @protected
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* @override
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*/
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goog.ui.TwoThumbSlider.prototype.getCssClass = function(orient) {
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return orient == goog.ui.SliderBase.Orientation.VERTICAL ?
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goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'vertical') :
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goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'horizontal');
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};
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/**
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* This creates a thumb element with the specified CSS class name.
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* @param {string} cs CSS class name of the thumb to be created.
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* @return {HTMLDivElement} The created thumb element.
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* @private
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*/
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goog.ui.TwoThumbSlider.prototype.createThumb_ = function(cs) {
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var thumb = this.getDomHelper().createDom('div', cs);
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goog.a11y.aria.setRole(thumb, goog.a11y.aria.Role.BUTTON);
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return /** @type {HTMLDivElement} */ (thumb);
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};
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/**
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* Creates the thumb members for a twothumbslider. If the
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* element contains a child with a class name 'goog-twothumbslider-value-thumb'
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* (or 'goog-twothumbslider-extent-thumb', respectively), then that will be used
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* as the valueThumb (or as the extentThumb, respectively). If the element
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* contains a child with a class name 'goog-twothumbslider-rangehighlight',
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* then that will be used as the range highlight.
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* @override
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*/
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goog.ui.TwoThumbSlider.prototype.createThumbs = function() {
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// find range highlight and thumbs
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var valueThumb = goog.dom.getElementsByTagNameAndClass(
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null, goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS, this.getElement())[0];
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var extentThumb = goog.dom.getElementsByTagNameAndClass(null,
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goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS, this.getElement())[0];
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var rangeHighlight = goog.dom.getElementsByTagNameAndClass(null,
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goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS, this.getElement())[0];
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if (!valueThumb) {
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valueThumb =
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this.createThumb_(goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS);
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this.getElement().appendChild(valueThumb);
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}
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if (!extentThumb) {
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extentThumb =
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this.createThumb_(goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS);
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this.getElement().appendChild(extentThumb);
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}
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if (!rangeHighlight) {
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rangeHighlight = this.getDomHelper().createDom('div',
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goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS);
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// Insert highlight before value thumb so that it renders under the thumbs.
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this.getDomHelper().insertSiblingBefore(rangeHighlight, valueThumb);
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}
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this.valueThumb = valueThumb;
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this.extentThumb = extentThumb;
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this.rangeHighlight = rangeHighlight;
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};
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