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| /*
* L.Handler.TouchZoom is used by L.Map to add pinch zoom on supported mobile browsers.
*/
L.Map.mergeOptions({
touchZoom: L.Browser.touch && !L.Browser.android23
});
L.Map.TouchZoom = L.Handler.extend({
addHooks: function () {
L.DomEvent.on(this._map._container, 'touchstart', this._onTouchStart, this);
},
removeHooks: function () {
L.DomEvent.off(this._map._container, 'touchstart', this._onTouchStart, this);
},
_onTouchStart: function (e) {
var map = this._map;
if (!e.touches || e.touches.length !== 2 || map._animatingZoom || this._zooming) { return; }
var p1 = map.mouseEventToLayerPoint(e.touches[0]),
p2 = map.mouseEventToLayerPoint(e.touches[1]),
viewCenter = map._getCenterLayerPoint();
this._startCenter = p1.add(p2)._divideBy(2);
this._startDist = p1.distanceTo(p2);
this._moved = false;
this._zooming = true;
this._centerOffset = viewCenter.subtract(this._startCenter);
if (map._panAnim) {
map._panAnim.stop();
}
L.DomEvent
.on(document, 'touchmove', this._onTouchMove, this)
.on(document, 'touchend', this._onTouchEnd, this);
L.DomEvent.preventDefault(e);
},
_onTouchMove: function (e) {
if (!e.touches || e.touches.length !== 2) { return; }
var map = this._map;
var p1 = map.mouseEventToLayerPoint(e.touches[0]),
p2 = map.mouseEventToLayerPoint(e.touches[1]);
this._scale = p1.distanceTo(p2) / this._startDist;
this._delta = p1._add(p2)._divideBy(2)._subtract(this._startCenter);
if (this._scale === 1) { return; }
if (!this._moved) {
L.DomUtil.addClass(map._mapPane, 'leaflet-touching');
map
.fire('movestart')
.fire('zoomstart');
this._moved = true;
}
L.Util.cancelAnimFrame(this._animRequest);
this._animRequest = L.Util.requestAnimFrame(
this._updateOnMove, this, true, this._map._container);
L.DomEvent.preventDefault(e);
},
_updateOnMove: function () {
var map = this._map,
origin = this._getScaleOrigin(),
center = map.layerPointToLatLng(origin),
zoom = map.getScaleZoom(this._scale);
map._animateZoom(center, zoom, this._startCenter, this._scale, this._delta, true);
},
_onTouchEnd: function () {
if (!this._moved || !this._zooming) { return; }
var map = this._map;
this._zooming = false;
L.DomUtil.removeClass(map._mapPane, 'leaflet-touching');
L.DomEvent
.off(document, 'touchmove', this._onTouchMove)
.off(document, 'touchend', this._onTouchEnd);
var origin = this._getScaleOrigin(),
center = map.layerPointToLatLng(origin),
oldZoom = map.getZoom(),
floatZoomDelta = map.getScaleZoom(this._scale) - oldZoom,
roundZoomDelta = (floatZoomDelta > 0 ?
Math.ceil(floatZoomDelta) : Math.floor(floatZoomDelta)),
zoom = map._limitZoom(oldZoom + roundZoomDelta),
scale = map.getZoomScale(zoom) / this._scale;
map._animateZoom(center, zoom, origin, scale, null, true);
},
_getScaleOrigin: function () {
var centerOffset = this._centerOffset.subtract(this._delta).divideBy(this._scale);
return this._startCenter.add(centerOffset);
}
});
L.Map.addInitHook('addHandler', 'touchZoom', L.Map.TouchZoom);
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