1 files changed, 79 insertions, 0 deletions
diff --git a/extlib/leaflet/src/handler/ShiftDragZoom.js b/extlib/leaflet/src/handler/ShiftDragZoom.js
new file mode 100644
index 00000000..ba216109
--- /dev/null
+++ b/extlib/leaflet/src/handler/ShiftDragZoom.js
@@ -0,0 +1,79 @@
+/*
+ * L.Handler.ShiftDragZoom is used internally by L.Map to add shift-drag zoom (zoom to a selected bounding box).
+ */
+
+L.Handler.ShiftDragZoom = L.Handler.extend({
+	initialize: function(map) {
+		this._map = map;
+		this._container = map._container;
+		this._pane = map._panes.overlayPane;
+	},
+	
+	enable: function() {
+		if (this._enabled) { return; }
+		
+		L.DomEvent.addListener(this._container, 'mousedown', this._onMouseDown, this);
+		
+		this._enabled = true;
+	},
+	
+	disable: function() {
+		if (!this._enabled) { return; }
+		
+		L.DomEvent.removeListener(this._container, 'mousedown', this._onMouseDown);
+		
+		this._enabled = false;
+	},
+	
+	_onMouseDown: function(e) {
+		if (!e.shiftKey || ((e.which != 1) && (e.button != 1))) { return false; }
+		
+		L.DomUtil.disableTextSelection();
+		
+		this._startLayerPoint = this._map.mouseEventToLayerPoint(e);
+		
+		this._box = L.DomUtil.create('div', 'leaflet-zoom-box', this._pane);
+		L.DomUtil.setPosition(this._box, this._startLayerPoint);
+		
+		//TODO move cursor to styles
+		this._container.style.cursor = 'crosshair';
+		
+		L.DomEvent.addListener(document, 'mousemove', this._onMouseMove, this);
+		L.DomEvent.addListener(document, 'mouseup', this._onMouseUp, this);
+		
+		L.DomEvent.preventDefault(e);
+	},
+	
+	_onMouseMove: function(e) {
+		var layerPoint = this._map.mouseEventToLayerPoint(e),
+			dx = layerPoint.x - this._startLayerPoint.x,
+			dy = layerPoint.y - this._startLayerPoint.y;
+		
+		var newX = Math.min(layerPoint.x, this._startLayerPoint.x),
+			newY = Math.min(layerPoint.y, this._startLayerPoint.y),
+			newPos = new L.Point(newX, newY);
+		
+		L.DomUtil.setPosition(this._box, newPos);
+		
+		this._box.style.width = (Math.abs(dx) - 4) + 'px';
+		this._box.style.height = (Math.abs(dy) - 4) + 'px';
+	},
+	
+	_onMouseUp: function(e) {
+		this._pane.removeChild(this._box);
+		this._container.style.cursor = '';
+		
+		L.DomUtil.enableTextSelection();
+
+		L.DomEvent.removeListener(document, 'mousemove', this._onMouseMove);
+		L.DomEvent.removeListener(document, 'mouseup', this._onMouseUp);
+		
+		var layerPoint = this._map.mouseEventToLayerPoint(e);
+		
+		var bounds = new L.LatLngBounds(
+				this._map.layerPointToLatLng(this._startLayerPoint),
+				this._map.layerPointToLatLng(layerPoint));
+		
+		this._map.fitBounds(bounds);
+	}
+});
+\ No newline at end of file