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import * as DomEvent from './DomEvent';
import Browser from '../core/Browser';
import {falseFn} from '../core/Util';
/*
* Extends L.DomEvent to provide touch support for Internet Explorer and Windows-based devices.
*/
var POINTER_DOWN = Browser.msPointer ? 'MSPointerDown' : 'pointerdown';
var POINTER_MOVE = Browser.msPointer ? 'MSPointerMove' : 'pointermove';
var POINTER_UP = Browser.msPointer ? 'MSPointerUp' : 'pointerup';
var POINTER_CANCEL = Browser.msPointer ? 'MSPointerCancel' : 'pointercancel';
var pEvent = {
touchstart : POINTER_DOWN,
touchmove : POINTER_MOVE,
touchend : POINTER_UP,
touchcancel : POINTER_CANCEL
};
var handle = {
touchstart : _onPointerStart,
touchmove : _handlePointer,
touchend : _handlePointer,
touchcancel : _handlePointer
};
var _pointers = {};
var _pointerDocListener = false;
// Provides a touch events wrapper for (ms)pointer events.
// ref https://www.w3.org/TR/pointerevents/ https://www.w3.org/Bugs/Public/show_bug.cgi?id=22890
export function addPointerListener(obj, type, handler) {
if (type === 'touchstart') {
_addPointerDocListener();
}
if (!handle[type]) {
console.warn('wrong event specified:', type);
return falseFn;
}
handler = handle[type].bind(this, handler);
obj.addEventListener(pEvent[type], handler, false);
return handler;
}
export function removePointerListener(obj, type, handler) {
if (!pEvent[type]) {
console.warn('wrong event specified:', type);
return;
}
obj.removeEventListener(pEvent[type], handler, false);
}
function _globalPointerDown(e) {
_pointers[e.pointerId] = e;
}
function _globalPointerMove(e) {
if (_pointers[e.pointerId]) {
_pointers[e.pointerId] = e;
}
}
function _globalPointerUp(e) {
delete _pointers[e.pointerId];
}
function _addPointerDocListener() {
// need to keep track of what pointers and how many are active to provide e.touches emulation
if (!_pointerDocListener) {
// we listen document as any drags that end by moving the touch off the screen get fired there
document.addEventListener(POINTER_DOWN, _globalPointerDown, true);
document.addEventListener(POINTER_MOVE, _globalPointerMove, true);
document.addEventListener(POINTER_UP, _globalPointerUp, true);
document.addEventListener(POINTER_CANCEL, _globalPointerUp, true);
_pointerDocListener = true;
}
}
function _handlePointer(handler, e) {
if (e.pointerType === (e.MSPOINTER_TYPE_MOUSE || 'mouse')) { return; }
e.touches = [];
for (var i in _pointers) {
e.touches.push(_pointers[i]);
}
e.changedTouches = [e];
handler(e);
}
function _onPointerStart(handler, e) {
// IE10 specific: MsTouch needs preventDefault. See #2000
if (e.MSPOINTER_TYPE_TOUCH && e.pointerType === e.MSPOINTER_TYPE_TOUCH) {
DomEvent.preventDefault(e);
}
_handlePointer(handler, e);
}
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