/*!
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* jQuery UI Touch Punch 0.2.3
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*
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* Copyright 2011–2014, Dave Furfero
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* Dual licensed under the MIT or GPL Version 2 licenses.
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*
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* Depends:
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* jquery.ui.widget.js
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* jquery.ui.mouse.js
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*/
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(function ($) {
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// Detect touch support
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$.support.touch = 'ontouchend' in document;
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// Ignore browsers without touch support
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if (!$.support.touch) {
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return;
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}
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var mouseProto = $.ui.mouse.prototype,
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_mouseInit = mouseProto._mouseInit,
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_mouseDestroy = mouseProto._mouseDestroy,
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touchHandled;
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/**
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* Simulate a mouse event based on a corresponding touch event
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* @param {Object} event A touch event
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* @param {String} simulatedType The corresponding mouse event
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*/
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function simulateMouseEvent (event, simulatedType) {
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// Ignore multi-touch events
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if (event.originalEvent.touches.length > 1) {
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return;
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}
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event.preventDefault();
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var touch = event.originalEvent.changedTouches[0],
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simulatedEvent = document.createEvent('MouseEvents');
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// Initialize the simulated mouse event using the touch event's coordinates
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simulatedEvent.initMouseEvent(
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simulatedType, // type
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true, // bubbles
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true, // cancelable
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window, // view
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1, // detail
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touch.screenX, // screenX
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touch.screenY, // screenY
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touch.clientX, // clientX
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touch.clientY, // clientY
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false, // ctrlKey
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false, // altKey
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false, // shiftKey
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false, // metaKey
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0, // button
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null // relatedTarget
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);
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// Dispatch the simulated event to the target element
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event.target.dispatchEvent(simulatedEvent);
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}
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/**
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* Handle the jQuery UI widget's touchstart events
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* @param {Object} event The widget element's touchstart event
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*/
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mouseProto._touchStart = function (event) {
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var self = this;
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// Ignore the event if another widget is already being handled
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if (touchHandled || !self._mouseCapture(event.originalEvent.changedTouches[0])) {
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return;
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}
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// Set the flag to prevent other widgets from inheriting the touch event
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touchHandled = true;
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// Track movement to determine if interaction was a click
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self._touchMoved = false;
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// Simulate the mouseover event
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simulateMouseEvent(event, 'mouseover');
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// Simulate the mousemove event
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simulateMouseEvent(event, 'mousemove');
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// Simulate the mousedown event
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simulateMouseEvent(event, 'mousedown');
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};
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/**
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* Handle the jQuery UI widget's touchmove events
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* @param {Object} event The document's touchmove event
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*/
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mouseProto._touchMove = function (event) {
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// Ignore event if not handled
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if (!touchHandled) {
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return;
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}
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// Interaction was not a click
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this._touchMoved = true;
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// Simulate the mousemove event
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simulateMouseEvent(event, 'mousemove');
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};
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/**
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* Handle the jQuery UI widget's touchend events
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* @param {Object} event The document's touchend event
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*/
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mouseProto._touchEnd = function (event) {
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// Ignore event if not handled
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if (!touchHandled) {
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return;
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}
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// Simulate the mouseup event
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simulateMouseEvent(event, 'mouseup');
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// Simulate the mouseout event
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simulateMouseEvent(event, 'mouseout');
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// If the touch interaction did not move, it should trigger a click
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if (!this._touchMoved) {
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// Simulate the click event
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simulateMouseEvent(event, 'click');
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}
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// Unset the flag to allow other widgets to inherit the touch event
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touchHandled = false;
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};
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/**
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* A duck punch of the $.ui.mouse _mouseInit method to support touch events.
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* This method extends the widget with bound touch event handlers that
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* translate touch events to mouse events and pass them to the widget's
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* original mouse event handling methods.
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*/
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mouseProto._mouseInit = function () {
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var self = this;
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// Delegate the touch handlers to the widget's element
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self.element.bind({
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touchstart: $.proxy(self, '_touchStart'),
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touchmove: $.proxy(self, '_touchMove'),
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touchend: $.proxy(self, '_touchEnd')
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});
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// Call the original $.ui.mouse init method
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_mouseInit.call(self);
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};
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/**
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* Remove the touch event handlers
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*/
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mouseProto._mouseDestroy = function () {
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var self = this;
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// Delegate the touch handlers to the widget's element
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self.element.unbind({
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touchstart: $.proxy(self, '_touchStart'),
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touchmove: $.proxy(self, '_touchMove'),
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touchend: $.proxy(self, '_touchEnd')
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});
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// Call the original $.ui.mouse destroy method
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_mouseDestroy.call(self);
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};
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})(jQuery);
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