/**
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<b>Custom drag event for touch devices</b> used in scrollbars.
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For better touch event handling and extra options a more advanced solution such as <u>Hammer.js</u> is recommended.
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*/
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//based on but not dependent on jQuery mobile
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/*
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* jQuery Mobile v1.3.2
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* http://jquerymobile.com
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*
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* Copyright 2010, 2013 jQuery Foundation, Inc. and other contributors
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* Released under the MIT license.
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* http://jquery.org/license
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*
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*/
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(function($ , undefined) {
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if(!ace.vars['touch']) return;
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var touchStartEvent = "touchstart MSPointerDown pointerdown",// : "mousedown",
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touchStopEvent = "touchend touchcancel MSPointerUp MSPointerCancel pointerup pointercancel",// : "mouseup",
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touchMoveEvent = "touchmove MSPointerMove MSPointerHover pointermove";// : "mousemove";
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$.event.special.ace_drag = {
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setup: function() {
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var min_threshold = 0;
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var $this = $(this);
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$this.on(touchStartEvent, function(event) {
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var data = event.originalEvent.touches ?
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event.originalEvent.touches[ 0 ] :
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event,
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start = {
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//time: Date.now(),
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coords: [ data.pageX, data.pageY ],
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origin: $(event.target)
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},
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stop;
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//start.origin.trigger({'type' : 'ace_dragStart', 'start':(start || [-1,-1])});
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var direction = false, dx = 0, dy = 0;
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function moveHandler(event) {
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if (!start) {
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return;
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}
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var data = event.originalEvent.touches ?
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event.originalEvent.touches[ 0 ] :
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event;
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stop = {
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coords: [ data.pageX, data.pageY ]
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};
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// prevent scrolling
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//if ( Math.abs(start.coords[1] - stop.coords[1]) > 0 || Math.abs(start.coords[0] - stop.coords[01]) > 0 ) {
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//event.preventDefault();
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//}
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if (start && stop) {
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dx = 0;
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dy = 0;
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direction =
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(
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Math.abs(dy = start.coords[ 1 ] - stop.coords[ 1 ]) > min_threshold
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&&
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Math.abs(dx = start.coords[ 0 ] - stop.coords[ 0 ]) <= Math.abs(dy)
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)
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?
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(dy > 0 ? 'up' : 'down')
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:
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(
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Math.abs(dx = start.coords[ 0 ] - stop.coords[ 0 ]) > min_threshold
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&&
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Math.abs( dy ) <= Math.abs(dx)
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)
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?
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(dx > 0 ? 'left' : 'right')
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:
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false;
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if( direction !== false ) {
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var retval = {cancel: false}
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start.origin.trigger({
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'type': 'ace_drag',
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//'start': start.coords,
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//'stop': stop.coords,
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'direction': direction,
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'dx': dx,
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'dy': dy,
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'retval': retval
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})
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// prevent document scrolling unless retval.cancel == true
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if( retval.cancel == false ) event.preventDefault();
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}
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}
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start.coords[0] = stop.coords[0];
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start.coords[1] = stop.coords[1];
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}
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$this
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.on(touchMoveEvent, moveHandler)
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.one(touchStopEvent, function(event) {
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$this.off(touchMoveEvent, moveHandler);
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//start.origin.trigger({'type' : 'ace_dragEnd', 'stop':(stop || [-1,-1])});
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start = stop = undefined;
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});
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});
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}
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}
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})(window.jQuery);
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