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1
| /*
* Extends L.DomEvent to provide touch support for Internet Explorer and Windows-based devices.
*/
L.extend(L.DomEvent, {
_msTouches: [],
_msDocumentListener: false,
// Provides a touch events wrapper for msPointer events.
// Based on changes by veproza https://github.com/CloudMade/Leaflet/pull/1019
addMsTouchListener: function (obj, type, handler, id) {
switch (type) {
case 'touchstart':
return this.addMsTouchListenerStart(obj, type, handler, id);
case 'touchend':
return this.addMsTouchListenerEnd(obj, type, handler, id);
case 'touchmove':
return this.addMsTouchListenerMove(obj, type, handler, id);
default:
throw 'Unknown touch event type';
}
},
addMsTouchListenerStart: function (obj, type, handler, id) {
var pre = '_leaflet_',
touches = this._msTouches;
var cb = function (e) {
var alreadyInArray = false;
for (var i = 0; i < touches.length; i++) {
if (touches[i].pointerId === e.pointerId) {
alreadyInArray = true;
break;
}
}
if (!alreadyInArray) {
touches.push(e);
}
e.touches = touches.slice();
e.changedTouches = [e];
handler(e);
};
obj[pre + 'touchstart' + id] = cb;
obj.addEventListener('MSPointerDown', cb, false);
// need to also listen for end events to keep the _msTouches list accurate
// this needs to be on the body and never go away
if (!this._msDocumentListener) {
var internalCb = function (e) {
for (var i = 0; i < touches.length; i++) {
if (touches[i].pointerId === e.pointerId) {
touches.splice(i, 1);
break;
}
}
};
//We listen on the documentElement as any drags that end by moving the touch off the screen get fired there
document.documentElement.addEventListener('MSPointerUp', internalCb, false);
document.documentElement.addEventListener('MSPointerCancel', internalCb, false);
this._msDocumentListener = true;
}
return this;
},
addMsTouchListenerMove: function (obj, type, handler, id) {
var pre = '_leaflet_',
touches = this._msTouches;
function cb(e) {
// don't fire touch moves when mouse isn't down
if (e.pointerType === e.MSPOINTER_TYPE_MOUSE && e.buttons === 0) { return; }
for (var i = 0; i < touches.length; i++) {
if (touches[i].pointerId === e.pointerId) {
touches[i] = e;
break;
}
}
e.touches = touches.slice();
e.changedTouches = [e];
handler(e);
}
obj[pre + 'touchmove' + id] = cb;
obj.addEventListener('MSPointerMove', cb, false);
return this;
},
addMsTouchListenerEnd: function (obj, type, handler, id) {
var pre = '_leaflet_',
touches = this._msTouches;
var cb = function (e) {
for (var i = 0; i < touches.length; i++) {
if (touches[i].pointerId === e.pointerId) {
touches.splice(i, 1);
break;
}
}
e.touches = touches.slice();
e.changedTouches = [e];
handler(e);
};
obj[pre + 'touchend' + id] = cb;
obj.addEventListener('MSPointerUp', cb, false);
obj.addEventListener('MSPointerCancel', cb, false);
return this;
},
removeMsTouchListener: function (obj, type, id) {
var pre = '_leaflet_',
cb = obj[pre + type + id];
switch (type) {
case 'touchstart':
obj.removeEventListener('MSPointerDown', cb, false);
break;
case 'touchmove':
obj.removeEventListener('MSPointerMove', cb, false);
break;
case 'touchend':
obj.removeEventListener('MSPointerUp', cb, false);
obj.removeEventListener('MSPointerCancel', cb, false);
break;
}
return this;
}
});
|