Indicate which handle was manipulated on change.

demo/dateSliderDemo.js

@@ -137,7 +137,7 @@
 
 		_returnValues: function(data){
 			try{
-				return "min:" + this._format(data.values.min) + " max:" + this._format(data.values.max);	
+				return "min:" + this._format(data.values.min) + " max:" + this._format(data.values.max) + " lastHandle:" + data.lastHandle;	
 			} catch (e){
 				return e;
 			}

demo/sliderDemo.js

@@ -339,7 +339,7 @@
 		},
 
 		_returnValues: function(data){
-			return "min:" + data.values.min + " max:" + data.values.max;
+			return "min:" + data.values.min + " max:" + data.values.max + " lastHandle:" + data.lastHandle;
 		}
 
 	});

jQRangeSlider.js

@@ -368,7 +368,8 @@
 			setTimeout(function(){
 				that.element.trigger(eventName, {
 						label: that.element,
-						values: that.values()
+						values: that.values(),
+						lastHandle: that._lastHandle ? that._lastHandle : null
 					});
 			}, 1);
 		},
@@ -402,9 +403,30 @@
 			this._values.min = this._min(left, right);
 			this._values.max = this._max(left, right);
 
+			this._updateLastValues();
+
 			return changing;
 		},
 
+		_updateLastValues: function() {
+			var left = this._leftHandle("value"),
+				right = this._rightHandle("value");
+
+			if (this._lastValues) {
+				if (this._lastValues.min !== left && this._lastValues.max === right) {
+					this._lastHandle = 'left';
+				}
+				if (this._lastValues.min !== left && this._lastValues.max !== right) {
+					this._lastHandle = 'middle';
+				}
+				if (this._lastValues.min === left && this._lastValues.max !== right) {
+					this._lastHandle = 'right';
+				}
+			}
+
+			this._lastValues = {min: this._values.min, max: this._values.max};
+		},
+
 		_min: function(value1, value2){
 			return Math.min(value1, value2);
 		},

tests/unit/tests.js

@@ -440,6 +440,44 @@ var scrollRightTest = new TestCase(
 	}
 );
 
+var handleLeftTest = new TestCase(
+	"Handle left",
+	function(){
+		var self = this;
+		$(el).on('valuesChanging', function(e,data) {
+			self.leftResult = data.lastHandle;
+		})
+		var leftHandle = el.find(".ui-rangeSlider-leftHandle");
+		leftHandle.simulate("drag", {
+			dx: el.find(".ui-rangeSlider-container").innerWidth() - leftHandle.position().left,
+			dy: 0
+		});
+	},
+	function(){
+		QUnit.equal(this.leftResult,'left', "Last Handle should be left");
+	}
+);
+
+
+var handleRightTest = new TestCase(
+	"Handle right",
+	function(){
+		var self = this;
+		$(el).on('valuesChanging', function(e,data) {
+			self.rightResult = data.lastHandle;
+		})
+		var rightHandle = el.find(".ui-rangeSlider-rightHandle");
+
+		rightHandle.simulate("drag", {
+			dx: el.find(".ui-rangeSlider-container").innerWidth() - rightHandle.position().left - rightHandle.outerWidth(true),
+			dy: 0
+		});
+	},
+	function(){
+		QUnit.equal(this.rightResult,'right', "Last Handle should be right");
+	}
+);
+
 var issue12 = new TestCase(
 	"Issue 12",
 	function(){
@@ -605,6 +643,7 @@ testRunner.add("jQRangeSlider", [setUp,
 			defaultCtorTest,
 			valuesSetter, changeValuesTest, minMaxSetter, boundsSetter,
 			zoomInTest, zoomOutTest, scrollLeftTest, scrollRightTest,
+			handleLeftTest, handleRightTest,
 			issue12,
 			rangeLimitMax, rangeLimitMaxWithMinAndMax, rangeLimitMin, rangeLimitMinWithMinAndMax,
 			destroyTest,