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L.Map.include(!(L.Transition && L.Transition.implemented()) ? {} : {
setView: function(center, zoom, forceReset) {
zoom = this._limitZoom(zoom);
var zoomChanged = (this._zoom != zoom);
if (this._loaded && !forceReset && this._layers) {
// difference between the new and current centers in pixels
var offset = this._getNewTopLeftPoint(center).subtract(this._getTopLeftPoint());
var done = (zoomChanged ?
!!this._zoomToIfCenterInView && this._zoomToIfCenterInView(center, zoom, offset) :
this._panByIfClose(offset));
// exit if animated pan or zoom started
if (done) { return this; }
}
// reset the map view
this._resetView(center, zoom);
return this;
},
panBy: function(offset) {
if (!this._panTransition) {
this._panTransition = new L.Transition(this._mapPane, {duration: 0.3});
this._panTransition.on('step', this._onPanTransitionStep, this);
this._panTransition.on('end', this._onPanTransitionEnd, this);
}
this.fire(this, 'movestart');
this._panTransition.run({
position: L.DomUtil.getPosition(this._mapPane).subtract(offset)
});
return this;
},
_onPanTransitionStep: function() {
this.fire('move');
},
_onPanTransitionEnd: function() {
this.fire('moveend');
},
_panByIfClose: function(offset) {
if (this._offsetIsWithinView(offset)) {
this.panBy(offset);
return true;
}
return false;
},
_offsetIsWithinView: function(offset, multiplyFactor) {
var m = multiplyFactor || 1,
size = this.getSize();
return (Math.abs(offset.x) <= size.x * m) &&
(Math.abs(offset.y) <= size.y * m);
}
});
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