svgedit/editor/touch.js

32 lines
1.1 KiB
JavaScript

// http://ross.posterous.com/2008/08/19/iphone-touch-events-in-javascript/
function touchHandler (event) {
const touches = event.changedTouches,
first = touches[0];
let type = '';
switch (event.type) {
case 'touchstart': type = 'mousedown'; break;
case 'touchmove': type = 'mousemove'; break;
case 'touchend': type = 'mouseup'; break;
default: return;
}
// initMouseEvent(type, canBubble, cancelable, view, clickCount,
// screenX, screenY, clientX, clientY, ctrlKey,
// altKey, shiftKey, metaKey, button, relatedTarget);
const simulatedEvent = document.createEvent('MouseEvent');
simulatedEvent.initMouseEvent(type, true, true, window, 1,
first.screenX, first.screenY,
first.clientX, first.clientY, false,
false, false, false, 0/* left */, null);
if (touches.length < 2) {
first.target.dispatchEvent(simulatedEvent);
event.preventDefault();
}
}
document.addEventListener('touchstart', touchHandler, true);
document.addEventListener('touchmove', touchHandler, true);
document.addEventListener('touchend', touchHandler, true);
document.addEventListener('touchcancel', touchHandler, true);