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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// 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.
/**
* @fileoverview Twothumbslider is a slider that allows to select a subrange
* within a range by dragging two thumbs. The selected sub-range is exposed
* through getValue() and getExtent().
*
* To decorate, the twothumbslider should be bound to an element with the class
* name 'goog-twothumbslider-[vertical / horizontal]' containing children with
* the classname 'goog-twothumbslider-value-thumb' and
* 'goog-twothumbslider-extent-thumb', respectively.
*
* Decorate Example:
* <div id="twothumbslider" class="goog-twothumbslider-horizontal">
* <div class="goog-twothumbslider-value-thumb">
* <div class="goog-twothumbslider-extent-thumb">
* </div>
* <script>
*
* var slider = new goog.ui.TwoThumbSlider;
* slider.decorate(document.getElementById('twothumbslider'));
*
* TODO(user): add a11y once we know what this element is
*
* @see ../demos/twothumbslider.html
*/
goog.provide('goog.ui.TwoThumbSlider');
goog.require('goog.a11y.aria');
goog.require('goog.a11y.aria.Role');
goog.require('goog.dom');
goog.require('goog.dom.TagName');
goog.require('goog.ui.SliderBase');
/**
* This creates a TwoThumbSlider object.
* @param {goog.dom.DomHelper=} opt_domHelper Optional DOM helper.
* @constructor
* @extends {goog.ui.SliderBase}
*/
goog.ui.TwoThumbSlider = function(opt_domHelper) {
goog.ui.SliderBase.call(this, opt_domHelper);
this.rangeModel.setValue(this.getMinimum());
this.rangeModel.setExtent(this.getMaximum() - this.getMinimum());
};
goog.inherits(goog.ui.TwoThumbSlider, goog.ui.SliderBase);
goog.tagUnsealableClass(goog.ui.TwoThumbSlider);
/**
* The prefix we use for the CSS class names for the slider and its elements.
* @type {string}
*/
goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX =
goog.getCssName('goog-twothumbslider');
/**
* CSS class name for the value thumb element.
* @type {string}
*/
goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS =
goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'value-thumb');
/**
* CSS class name for the extent thumb element.
* @type {string}
*/
goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS =
goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'extent-thumb');
/**
* CSS class name for the range highlight element.
* @type {string}
*/
goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS =
goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'rangehighlight');
/**
* @param {goog.ui.SliderBase.Orientation} orient orientation of the slider.
* @return {string} The CSS class applied to the twothumbslider element.
* @protected
* @override
*/
goog.ui.TwoThumbSlider.prototype.getCssClass = function(orient) {
return orient == goog.ui.SliderBase.Orientation.VERTICAL ?
goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'vertical') :
goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'horizontal');
};
/**
* This creates a thumb element with the specified CSS class name.
* @param {string} cs CSS class name of the thumb to be created.
* @return {!HTMLDivElement} The created thumb element.
* @private
*/
goog.ui.TwoThumbSlider.prototype.createThumb_ = function(cs) {
var thumb = this.getDomHelper().createDom(goog.dom.TagName.DIV, cs);
goog.a11y.aria.setRole(thumb, goog.a11y.aria.Role.BUTTON);
return /** @type {!HTMLDivElement} */ (thumb);
};
/**
* Creates the thumb members for a twothumbslider. If the
* element contains a child with a class name 'goog-twothumbslider-value-thumb'
* (or 'goog-twothumbslider-extent-thumb', respectively), then that will be used
* as the valueThumb (or as the extentThumb, respectively). If the element
* contains a child with a class name 'goog-twothumbslider-rangehighlight',
* then that will be used as the range highlight.
* @override
*/
goog.ui.TwoThumbSlider.prototype.createThumbs = function() {
// find range highlight and thumbs
var valueThumb = goog.dom.getElementsByTagNameAndClass(
null, goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS, this.getElement())[0];
var extentThumb = goog.dom.getElementsByTagNameAndClass(
null, goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS,
this.getElement())[0];
var rangeHighlight = goog.dom.getElementsByTagNameAndClass(
null, goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS,
this.getElement())[0];
if (!valueThumb) {
valueThumb =
this.createThumb_(goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS);
this.getElement().appendChild(valueThumb);
}
if (!extentThumb) {
extentThumb =
this.createThumb_(goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS);
this.getElement().appendChild(extentThumb);
}
if (!rangeHighlight) {
rangeHighlight = this.getDomHelper().createDom(
goog.dom.TagName.DIV, goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS);
// Insert highlight before value thumb so that it renders under the thumbs.
this.getDomHelper().insertSiblingBefore(rangeHighlight, valueThumb);
}
this.valueThumb = /** @type {!HTMLDivElement} */ (valueThumb);
this.extentThumb = /** @type {!HTMLDivElement} */ (extentThumb);
this.rangeHighlight = /** @type {!HTMLDivElement} */ (rangeHighlight);
};
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