Add a baselayerchange event

spec/happen.js

@@ -0,0 +1,93 @@
+// https://github.com/tmcw/happen
+
+!(function(context) {
+    var h = {};
+
+    // Make inheritance bearable: clone one level of properties
+    function extend(child, parent) {
+        for (var property in parent) {
+            if (typeof child[property] == 'undefined') {
+                child[property] = parent[property];
+            }
+        }
+        return child;
+    }
+
+    h.once = function(x, o) {
+        var evt;
+
+        if (o.type.slice(0, 3) === 'key') {
+            if (typeof Event === 'function') {
+                evt = new Event(o.type);
+                evt.keyCode = o.keyCode || 0;
+                evt.charCode = o.charCode || 0;
+                evt.shift = o.shift || false;
+                evt.meta = o.meta || false;
+                evt.ctrl = o.ctrl || false;
+                evt.alt = o.alt || false;
+            } else {
+                evt = document.createEvent('KeyboardEvent');
+                // https://developer.mozilla.org/en/DOM/event.initKeyEvent
+                // https://developer.mozilla.org/en/DOM/KeyboardEvent
+                evt[(evt.initKeyEvent) ? 'initKeyEvent'
+                    : 'initKeyboardEvent'](
+                    o.type, //  in DOMString typeArg,
+                    true,   //  in boolean canBubbleArg,
+                    true,   //  in boolean cancelableArg,
+                    null,   //  in nsIDOMAbstractView viewArg,  Specifies UIEvent.view. This value may be null.
+                    o.ctrl || false,  //  in boolean ctrlKeyArg,
+                    o.alt || false,  //  in boolean altKeyArg,
+                    o.shift || false,  //  in boolean shiftKeyArg,
+                    o.meta || false,  //  in boolean metaKeyArg,
+                    o.keyCode || 0,     //  in unsigned long keyCodeArg,
+                    o.charCode || 0       //  in unsigned long charCodeArg);
+                );
+            }
+        } else {
+            evt = document.createEvent('MouseEvents');
+            // https://developer.mozilla.org/en/DOM/event.initMouseEvent
+            evt.initMouseEvent(o.type,
+                true, // canBubble
+                true, // cancelable
+                window, // 'AbstractView'
+                o.clicks || 0, // click count
+                o.screenX || 0, // screenX
+                o.screenY || 0, // screenY
+                o.clientX || 0, // clientX
+                o.clientY || 0, // clientY
+                o.ctrl || 0, // ctrl
+                o.alt || false, // alt
+                o.shift || false, // shift
+                o.meta || false, // meta
+                o.button || false, // mouse button
+                null // relatedTarget
+            );
+        }
+
+        x.dispatchEvent(evt);
+    };
+
+    var shortcuts = ['click', 'mousedown', 'mouseup', 'mousemove', 'keydown', 'keyup', 'keypress'],
+        s, i = 0;
+
+    while (s = shortcuts[i++]) {
+        h[s] = (function(s) {
+            return function(x, o) {
+                h.once(x, extend(o || {}, { type: s }));
+            };
+        })(s);
+    }
+
+    h.dblclick = function(x, o) {
+        h.once(x, extend(o || {}, {
+            type: 'dblclick',
+            clicks: 2
+        }));
+    };
+
+    this.happen = h;
+
+    if (typeof module !== 'undefined') {
+        module.exports = this.happen;
+    }
+})(this);

spec/runner.html

@@ -5,6 +5,7 @@
 	<link rel="stylesheet" type="text/css" href="jasmine/jasmine.css">
 	<script type="text/javascript" src="jasmine/jasmine.js"></script>
 	<script type="text/javascript" src="jasmine/jasmine-html.js"></script>
+	<script type="text/javascript" src="happen.js"></script>
 
 	<!-- source files -->
 
@@ -20,6 +21,9 @@
 	<script type="text/javascript" src="suites/SpecHelper.js"></script>
 	<script type="text/javascript" src="suites/LeafletSpec.js"></script>
 
+	<!-- /control -->
+	<script type="text/javascript" src="suites/control/Control.LayersSpec.js"></script>
+
 	<!-- /core -->
 	<script type="text/javascript" src="suites/core/UtilSpec.js"></script>
 	<script type="text/javascript" src="suites/core/ClassSpec.js"></script>

spec/suites/control/Control.LayersSpec.js

@@ -0,0 +1,32 @@
+describe("Control.Layers", function () {
+	var map;
+
+	beforeEach(function () {
+		map = L.map(document.createElement('div'));
+	});
+
+	describe("baselayerchange event", function () {
+		it("is fired on input that changes the base layer", function () {
+			var baseLayers = {"Layer 1": L.tileLayer(), "Layer 2": L.tileLayer()},
+				layers = L.control.layers(baseLayers).addTo(map),
+				spy = jasmine.createSpy();
+
+			map.on('baselayerchange', spy);
+			happen.click(layers._baseLayersList.getElementsByTagName("input")[0]);
+
+			expect(spy).toHaveBeenCalled();
+			expect(spy.mostRecentCall.args[0].layer).toBe(baseLayers["Layer 1"]);
+		});
+
+		it("is not fired on input that doesn't change the base layer", function () {
+			var overlays = {"Marker 1": L.marker([0, 0]), "Marker 2": L.marker([0, 0])},
+				layers = L.control.layers({}, overlays).addTo(map),
+				spy = jasmine.createSpy();
+
+			map.on('baselayerchange', spy);
+			happen.click(layers._overlaysList.getElementsByTagName("input")[0]);
+
+			expect(spy).not.toHaveBeenCalled();
+		});
+	});
+});

src/control/Control.Layers.js

@@ -177,18 +177,26 @@ L.Control.Layers = L.Control.extend({
 	_onInputClick: function () {
 		var i, input, obj,
 			inputs = this._form.getElementsByTagName('input'),
-			inputsLen = inputs.length;
+			inputsLen = inputs.length,
+			baseLayer;
 
 		for (i = 0; i < inputsLen; i++) {
 			input = inputs[i];
 			obj = this._layers[input.layerId];
 
-			if (input.checked) {
-				this._map.addLayer(obj.layer, !obj.overlay);
-			} else {
+			if (input.checked && !this._map.hasLayer(obj.layer)) {
+				this._map.addLayer(obj.layer);
+				if (!obj.overlay) {
+					baseLayer = obj.layer;
+				}
+			} else if (!input.checked && this._map.hasLayer(obj.layer)) {
 				this._map.removeLayer(obj.layer);
 			}
 		}
+
+		if (baseLayer) {
+			this._map.fire('baselayerchange', {layer: baseLayer})
+		}
 	},
 
 	_expand: function () {