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import * as DomEvent from './DomEvent';
/*
* Extends the event handling code with double tap support for mobile browsers.
*
* Note: currently most browsers fire native dblclick, with only a few exceptions
* (see https://github.com/Leaflet/Leaflet/issues/7012#issuecomment-595087386)
*/
function makeDblclick(event) {
// in modern browsers `type` cannot be just overridden:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only
var newEvent = {},
prop, i;
for (i in event) {
prop = event[i];
newEvent[i] = prop && prop.bind ? prop.bind(event) : prop;
}
event = newEvent;
newEvent.type = 'dblclick';
newEvent.detail = 2;
newEvent.isTrusted = false;
newEvent._simulated = true; // for debug purposes
return newEvent;
}
var delay = 200;
export function addDoubleTapListener(obj, handler) {
// Most browsers handle double tap natively
obj.addEventListener('dblclick', handler);
// On some platforms the browser doesn't fire native dblclicks for touch events.
// It seems that in all such cases `detail` property of `click` event is always `1`.
// So here we rely on that fact to avoid excessive 'dblclick' simulation when not needed.
var last = 0,
detail;
function simDblclick(e) {
if (e.detail !== 1) {
detail = e.detail; // keep in sync to avoid false dblclick in some cases
return;
}
if (e.pointerType === 'mouse' ||
(e.sourceCapabilities && !e.sourceCapabilities.firesTouchEvents)) {
return;
}
// When clicking on an <input>, the browser generates a click on its
// <label> (and vice versa) triggering two clicks in quick succession.
// This ignores clicks on elements which are a label with a 'for'
// attribute (or children of such a label), but not children of
// a <input>.
var path = DomEvent.getPropagationPath(e);
if (path.some(function (el) {
return el instanceof HTMLLabelElement && el.attributes.for;
}) &&
!path.some(function (el) {
return (
el instanceof HTMLInputElement ||
el instanceof HTMLSelectElement
);
})
) {
return;
}
var now = Date.now();
if (now - last <= delay) {
detail++;
if (detail === 2) {
handler(makeDblclick(e));
}
} else {
detail = 1;
}
last = now;
}
obj.addEventListener('click', simDblclick);
return {
dblclick: handler,
simDblclick: simDblclick
};
}
export function removeDoubleTapListener(obj, handlers) {
obj.removeEventListener('dblclick', handlers.dblclick);
obj.removeEventListener('click', handlers.simDblclick);
}
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