99 lines
2.5 KiB
JavaScript
99 lines
2.5 KiB
JavaScript
var TOUCH_INPUT_MAP = {
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touchstart: INPUT_START,
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touchmove: INPUT_MOVE,
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touchend: INPUT_END,
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touchcancel: INPUT_CANCEL
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};
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var TOUCH_TARGET_EVENTS = 'touchstart touchmove touchend touchcancel';
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/**
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* Multi-user touch events input
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* @constructor
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* @extends Input
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*/
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function TouchInput() {
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this.evTarget = TOUCH_TARGET_EVENTS;
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this.targetIds = {};
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Input.apply(this, arguments);
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}
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inherit(TouchInput, Input, {
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handler: function MTEhandler(ev) {
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var type = TOUCH_INPUT_MAP[ev.type];
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var touches = getTouches.call(this, ev, type);
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if (!touches) {
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return;
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}
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this.callback(this.manager, type, {
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pointers: touches[0],
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changedPointers: touches[1],
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pointerType: INPUT_TYPE_TOUCH,
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srcEvent: ev
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});
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}
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});
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/**
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* @this {TouchInput}
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* @param {Object} ev
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* @param {Number} type flag
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* @returns {undefined|Array} [all, changed]
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*/
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function getTouches(ev, type) {
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var allTouches = toArray(ev.touches);
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var targetIds = this.targetIds;
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// when there is only one touch, the process can be simplified
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if (type & (INPUT_START | INPUT_MOVE) && allTouches.length === 1) {
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targetIds[allTouches[0].identifier] = true;
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return [allTouches, allTouches];
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}
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var i,
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targetTouches,
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changedTouches = toArray(ev.changedTouches),
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changedTargetTouches = [],
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target = this.target;
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// get target touches from touches
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targetTouches = allTouches.filter(function(touch) {
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return hasParent(touch.target, target);
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});
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// collect touches
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if (type === INPUT_START) {
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i = 0;
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while (i < targetTouches.length) {
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targetIds[targetTouches[i].identifier] = true;
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i++;
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}
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}
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// filter changed touches to only contain touches that exist in the collected target ids
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i = 0;
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while (i < changedTouches.length) {
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if (targetIds[changedTouches[i].identifier]) {
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changedTargetTouches.push(changedTouches[i]);
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}
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// cleanup removed touches
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if (type & (INPUT_END | INPUT_CANCEL)) {
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delete targetIds[changedTouches[i].identifier];
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}
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i++;
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}
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if (!changedTargetTouches.length) {
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return;
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}
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return [
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// merge targetTouches with changedTargetTouches so it contains ALL touches, including 'end' and 'cancel'
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uniqueArray(targetTouches.concat(changedTargetTouches), 'identifier', true),
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changedTargetTouches
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];
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}
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