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YUI 3.13.0 (build 508226d)
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Copyright 2013 Yahoo! Inc. All rights reserved.
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Licensed under the BSD License.
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http://yuilibrary.com/license/
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YUI.add('clickable-rail', function (Y, NAME) {
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* Adds support for mouse interaction with the Slider rail triggering thumb
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* @submodule clickable-rail
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* Slider extension that allows clicking on the Slider's rail element,
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* triggering the thumb to align with the location of the click.
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* @class ClickableRail
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function ClickableRail() {
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this._initClickableRail();
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Y.ClickableRail = Y.mix(ClickableRail, {
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// Prototype methods added to host class
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* Initializes the internal state and sets up events.
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* @method _initClickableRail
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_initClickableRail: function () {
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this._evtGuid = this._evtGuid || (Y.guid() + '|');
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* Broadcasts when the rail has received a mousedown event and
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* triggers the thumb positioning. Use
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* <code>e.preventDefault()</code> or
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* <code>set("clickableRail", false)</code> to prevent
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* the thumb positioning.
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* @event railMouseDown
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* @preventable _defRailMouseDownFn
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this.publish('railMouseDown', {
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defaultFn: this._defRailMouseDownFn
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this.after('render', this._bindClickableRail);
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this.on('destroy', this._unbindClickableRail);
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* Attaches DOM event subscribers to support rail interaction.
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* @method _bindClickableRail
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_bindClickableRail: function () {
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this._dd.addHandle(this.rail);
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this.rail.on(this._evtGuid + Y.DD.Drag.START_EVENT,
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Y.bind(this._onRailMouseDown, this));
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* Detaches DOM event subscribers for cleanup/destruction cycle.
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* @method _unbindClickableRail
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_unbindClickableRail: function () {
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if (this.get('rendered')) {
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var contentBox = this.get('contentBox'),
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rail = contentBox.one('.' + this.getClassName('rail'));
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rail.detach(this.evtGuid + '*');
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* Dispatches the railMouseDown event.
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* @method _onRailMouseDown
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* @param e {DOMEvent} the mousedown event object
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_onRailMouseDown: function (e) {
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if (this.get('clickableRail') && !this.get('disabled')) {
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this.fire('railMouseDown', { ev: e });
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* Default behavior for the railMouseDown event. Centers the thumb at
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* the click location and passes control to the DDM to behave as though
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* the thumb itself were clicked in preparation for a drag operation.
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* @method _defRailMouseDownFn
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* @param e {Event} the EventFacade for the railMouseDown custom event
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_defRailMouseDownFn: function (e) {
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// Logic that determines which thumb should be used is abstracted
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// to someday support multi-thumb sliders
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var dd = this._resolveThumb(e),
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i = this._key.xyIndex,
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length = parseFloat(this.get('length'), 10),
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thumb = dd.get('dragNode');
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thumbSize = parseFloat(thumb.getStyle(this._key.dim), 10);
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// Step 1. Allow for aligning to thumb center or edge, etc
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xy = this._getThumbDestination(e, thumb);
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// Step 2. Remove page offsets to give just top/left style val
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xy = xy[ i ] - this.rail.getXY()[i];
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// Step 3. Constrain within the rail in case of attempt to
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// center the thumb when clicking on the end of the rail
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(length - thumbSize));
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this._uiMoveThumb(xy, { source: 'rail' });
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// Set e.target for DD's IE9 patch which calls
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// e.target._node.setCapture() to allow imgs to be dragged.
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// Without this, setCapture is called from the rail and rail
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// clicks on other Sliders may have their thumb movements
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// overridden by a different Slider (the thumb on the wrong
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e.target = this.thumb.one('img') || this.thumb;
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// Delegate to DD's natural behavior
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dd._handleMouseDownEvent(e);
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// TODO: this won't trigger a slideEnd if the rail is clicked
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// check if dd._move(e); dd._dragThreshMet = true; dd.start();
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// will do the trick. Is that even a good idea?
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* Resolves which thumb to actuate if any. Override this if you want to
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* support multiple thumbs. By default, returns the Drag instance for
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* the thumb stored by the Slider.
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* @method _resolveThumb
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* @param e {DOMEvent} the mousedown event object
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* @return {DD.Drag} the Drag instance that should be moved
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_resolveThumb: function (e) {
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/* Temporary workaround
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var primaryOnly = this._dd.get('primaryButtonOnly'),
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validClick = !primaryOnly || e.button <= 1;
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return (validClick) ? this._dd : null;
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* Calculates the top left position the thumb should be moved to to
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* align the click XY with the center of the specified node.
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* @method _getThumbDestination
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* @param e {DOMEvent} The mousedown event object
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* @param node {Node} The node to position
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* @return {Array} the [top, left] pixel position of the destination
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_getThumbDestination: function (e, node) {
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var offsetWidth = node.get('offsetWidth'),
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offsetHeight = node.get('offsetHeight');
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(e.pageX - Math.round((offsetWidth / 2))),
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(e.pageY - Math.round((offsetHeight / 2)))
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// Static properties added onto host class
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* Enable or disable clickable rail support.
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* @attribute clickableRail
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validator: Y.Lang.isBoolean
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}, '3.13.0', {"requires": ["slider-base"]});