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import * as Browser from '../core/Browser';
import {_pointersCount} from './DomEvent.Pointer';
/*
* Extends the event handling code with double tap support for mobile browsers.
*/
var _touchstart = Browser.msPointer ? 'MSPointerDown' : Browser.pointer ? 'pointerdown' : 'touchstart';
var _touchend = Browser.msPointer ? 'MSPointerUp' : Browser.pointer ? 'pointerup' : 'touchend';
var _pre = '_leaflet_';
// inspired by Zepto touch code by Thomas Fuchs
export function addDoubleTapListener(obj, handler, id) {
var last, touch,
doubleTap = false,
delay = 250;
function onTouchStart(e) {
var count;
if (Browser.pointer) {
if ((!Browser.edge) || e.pointerType === 'mouse') { return; }
count = _pointersCount;
} else {
count = e.touches.length;
}
if (count > 1) { return; }
var now = Date.now(),
delta = now - (last || now);
touch = e.touches ? e.touches[0] : e;
doubleTap = (delta > 0 && delta <= delay);
last = now;
}
function onTouchEnd(e) {
if (doubleTap && !touch.cancelBubble) {
if (Browser.pointer) {
if ((!Browser.edge) || e.pointerType === 'mouse') { return; }
// work around .type being readonly with MSPointer* events
var newTouch = {},
prop, i;
for (i in touch) {
prop = touch[i];
newTouch[i] = prop && prop.bind ? prop.bind(touch) : prop;
}
touch = newTouch;
}
touch.type = 'dblclick';
handler(touch);
last = null;
}
}
obj[_pre + _touchstart + id] = onTouchStart;
obj[_pre + _touchend + id] = onTouchEnd;
obj[_pre + 'dblclick' + id] = handler;
obj.addEventListener(_touchstart, onTouchStart, false);
obj.addEventListener(_touchend, onTouchEnd, false);
// On some platforms (notably, chrome<55 on win10 + touchscreen + mouse),
// the browser doesn't fire touchend/pointerup events but does fire
// native dblclicks. See #4127.
// Edge 14 also fires native dblclicks, but only for pointerType mouse, see #5180.
obj.addEventListener('dblclick', handler, false);
return this;
}
export function removeDoubleTapListener(obj, id) {
var touchstart = obj[_pre + _touchstart + id],
touchend = obj[_pre + _touchend + id],
dblclick = obj[_pre + 'dblclick' + id];
obj.removeEventListener(_touchstart, touchstart, false);
obj.removeEventListener(_touchend, touchend, false);
if (!Browser.edge) {
obj.removeEventListener('dblclick', dblclick, false);
}
return this;
}
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