1 files changed, 62 insertions, 0 deletions
diff --git a/extlib/leaflet/src/map/ext/Map.PanAnimation.js b/extlib/leaflet/src/map/ext/Map.PanAnimation.js
new file mode 100644
index 00000000..02ccfd15
--- /dev/null
+++ b/extlib/leaflet/src/map/ext/Map.PanAnimation.js
@@ -0,0 +1,62 @@
+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);
+	}
+});
+\ No newline at end of file