67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
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import { scroll } from './events.js';
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import rt from './runtimes.js';
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const eventtmp = {
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touchTracker: []
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};
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const copyTouch = touch => {
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return {
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identifier: touch.identifier,
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screenX: touch.screenX,
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screenY: touch.screenY
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};
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};
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const getTrackedTouchIndex = identifier => {
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for(let i = 0; i < eventtmp.touchTracker.length; i++) {
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if(eventtmp.touchTracker[i].identifier == identifier)
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return i;
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}
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return -1;
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};
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const removeTouch = identifier => {
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let index = getTrackedTouchIndex(ct.item(i).identifier);
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if(index === -1)
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return index;
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eventtmp.touchTracker.splice(index, 1);
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};
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const touchstart = e => {
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if(!rt.events.scroll) {
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const ct = e.changedTouches;
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for(let i = 0; i < e.changedTouches.length; i++)
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eventtmp.touchTracker.push(copyTouch(ct.item(i)));
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}
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};
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const touchmove = e => {
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e.preventDefault();
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};
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const touchend = e => {
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e.preventDefault();
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if(!rt.events.scroll) {
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let ct = e.changedTouches;
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for(let i = 0; i < ct.length; i++) {
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let index = getTrackedTouchIndex(ct.item(i).identifier);
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if(index !== -1) {
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let t = copyTouch(eventtmp.touchTracker[index]);
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if(Math.abs(Math.atan((ct.item(i).screenX - t.screenX) / (ct.item(i).screenY - t.screenY))) < 30)
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scroll({ deltaY: t.screenY > ct.item(i).screenY?1:-1 });
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}
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}
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}
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};
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const touchcancel = e => {
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e.preventDefault();
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const ct = e.changedTouches;
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ct.forEach(e => removeTouch(ct.item(ct).identifier));
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};
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window.addEventListener("touchstart", touchstart);
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window.addEventListener("touchmove", touchmove);
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window.addEventListener("touchend", touchend);
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window.addEventListener("touchcancel", touchcancel);
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