250 lines
7.8 KiB
JavaScript
250 lines
7.8 KiB
JavaScript
/*!
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* jQuery UI Touch Punch 1.0.9 as modified by RWAP Software
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* based on original touchpunch v0.2.3 which has not been updated since 2014
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*
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* Updates by RWAP Software to take account of various suggested changes on the original code issues
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*
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* Original: https://github.com/furf/jquery-ui-touch-punch
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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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* Fork: https://github.com/RWAP/jquery-ui-touch-punch
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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( factory ) {
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if ( typeof define === "function" && define.amd ) {
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// AMD. Register as an anonymous module.
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define([ "jquery", "jquery-ui" ], factory );
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} else {
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// Browser globals
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factory( jQuery );
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}
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}(function ($) {
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// Detect touch support - Windows Surface devices and other touch devices
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$.mspointer = window.navigator.msPointerEnabled;
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$.touch = ( 'ontouchstart' in document
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|| 'ontouchstart' in window
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|| window.TouchEvent
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|| (window.DocumentTouch && document instanceof DocumentTouch)
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|| navigator.maxTouchPoints > 0
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|| navigator.msMaxTouchPoints > 0
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);
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// Ignore browsers without touch or mouse support
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if ((!$.touch && !$.mspointer) || !$.ui.mouse) {
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return;
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}
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let 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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* Get the x,y position of a touch event
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* @param {Object} event A touch event
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*/
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function getTouchCoords (event) {
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return {
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x: event.originalEvent.changedTouches[0].pageX,
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y: event.originalEvent.changedTouches[0].pageY
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};
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}
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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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//Ignore input or textarea elements so user can still enter text
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if ($(event.target).is("input") || $(event.target).is("textarea")) {
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return;
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}
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// Prevent "Ignored attempt to cancel a touchmove event with cancelable=false" errors
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if (event.cancelable) {
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event.preventDefault();
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}
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let 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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let self = this;
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// Interaction time
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this._startedMove = event.timeStamp;
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// Track movement to determine if interaction was a click
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self._startPos = getTouchCoords(event);
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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 moved
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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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// Check for this in two ways - length of time of simulation and distance moved
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// Allow for Apple Stylus to be used also
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let timeMoving = event.timeStamp - this._startedMove;
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if (!this._touchMoved || timeMoving < 500) {
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// Simulate the click event
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simulateMouseEvent(event, 'click');
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} else {
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let endPos = getTouchCoords(event);
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if ((Math.abs(endPos.x - this._startPos.x) < 10) && (Math.abs(endPos.y - this._startPos.y) < 10)) {
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// If the touch interaction did not move, it should trigger a click
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if (!this._touchMoved || event.originalEvent.changedTouches[0].touchType === 'stylus') {
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// Simulate the click event
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simulateMouseEvent(event, 'click');
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}
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}
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}
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// Unset the flag to determine the touch movement stopped
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this._touchMoved = false;
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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 $.ui.mouse _mouseInit method to support touch events.
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* This method extends the widget with bound touch event handlers that
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* translate touch events to mouse events and pass them to the widget's
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* original mouse event handling methods.
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*/
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mouseProto._mouseInit = function () {
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let self = this;
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// Microsoft Surface Support = remove original touch Action
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if ($.support.mspointer) {
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self.element[0].style.msTouchAction = 'none';
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}
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// Delegate the touch handlers to the widget's element
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self.element.on({
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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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let self = this;
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// Delegate the touch handlers to the widget's element
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self.element.off({
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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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}));
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