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83 lines
1.9 KiB
83 lines
1.9 KiB
import {
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INPUT_START,
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INPUT_MOVE,
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INPUT_END,
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INPUT_CANCEL,
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INPUT_TYPE_TOUCH
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} from '../inputjs/input-consts';
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import Input from '../inputjs/input-constructor';
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import toArray from '../utils/to-array';
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import uniqueArray from '../utils/unique-array';
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const SINGLE_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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const SINGLE_TOUCH_TARGET_EVENTS = 'touchstart';
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const SINGLE_TOUCH_WINDOW_EVENTS = 'touchstart touchmove touchend touchcancel';
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/**
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* @private
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* Touch events input
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* @constructor
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* @extends Input
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*/
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export default class SingleTouchInput extends Input {
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constructor() {
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var proto = SingleTouchInput.prototype;
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proto.evTarget = SINGLE_TOUCH_TARGET_EVENTS;
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proto.evWin = SINGLE_TOUCH_WINDOW_EVENTS;
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super(...arguments);
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this.started = false;
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}
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handler(ev) {
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let type = SINGLE_TOUCH_INPUT_MAP[ev.type];
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// should we handle the touch events?
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if (type === INPUT_START) {
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this.started = true;
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}
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if (!this.started) {
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return;
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}
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let touches = normalizeSingleTouches.call(this, ev, type);
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// when done, reset the started state
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if (type & (INPUT_END | INPUT_CANCEL) && touches[0].length - touches[1].length === 0) {
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this.started = false;
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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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* @private
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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 normalizeSingleTouches(ev, type) {
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let all = toArray(ev.touches);
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let changed = toArray(ev.changedTouches);
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if (type & (INPUT_END | INPUT_CANCEL)) {
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all = uniqueArray(all.concat(changed), 'identifier', true);
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}
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return [all, changed];
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}
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