Make Item#removeOn() calls work with new event callback mechanism.

src/item/Item.js

@@ -1935,46 +1935,6 @@ var Item = this.Item = Base.extend(/** @lends Item# */{
 	 * }
 	 */
 
-	var sets = {
-		down: {}, drag: {}, up: {}, move: {}
-	};
-
-	function removeAll(set) {
-		for (var id in set) {
-			var item = set[id];
-			item.remove();
-			for (var type in sets) {
-				var other = sets[type];
-				if (other != set && other[item.getId()])
-					delete other[item.getId()];
-			}
-		}
-	}
-
-	function installHandler(name) {
-		var handler = 'onMouse' + Base.capitalize(name);
-		// Inject a onMouse handler that performs all the behind the scene magic
-		// and calls the script's handler at the end, if defined.
-		var func = paper.tool[handler];
-		if (!func || !func._installed) {
-			var hash = {};
-			hash[handler] = function(event) {
-				// Always clear the drag set on mouseup
-				if (name === 'up')
-					sets.drag = {};
-				removeAll(sets[name]);
-				sets[name] = {};
-				// Call the script's overridden handler, if defined
-				if (this.base)
-					this.base(event);
-			};
-			paper.tool.inject(hash);
-			// Only install this handler once, and mark it as installed,
-			// to prevent repeated installing.
-			paper.tool[handler]._installed = true;
-		}
-	}
-
 	// TODO: implement Item#removeOnFrame
 	return Base.each(['down', 'drag', 'up', 'move'], function(name) {
 		this['removeOn' + Base.capitalize(name)] = function() {
@@ -1986,12 +1946,10 @@ var Item = this.Item = Base.extend(/** @lends Item# */{
 		removeOn: function(obj) {
 			for (var name in obj) {
 				if (obj[name]) {
-					sets[name][this.getId()] = this;
+					var key = 'mouse' + name,
-					// Since the drag set gets cleared in up, we need to make
+						sets = Tool._removeSets = Tool._removeSets || {};
-					// sure it's installed too
+					sets[key] = sets[key] || {};
-					if (name === 'drag')
+					sets[key][this.getId()] = this;
-						installHandler('up');
-					installHandler(name);
 				}
 			}
 			return this;

src/tool/Tool.js

@@ -328,6 +328,27 @@ var Tool = this.Tool = PaperScopeItem.extend(Callback, /** @lends Tool# */{
 	onHandleEvent: function(type, pt, event) {
 		// Update global reference to this scope.
 		paper = this._scope;
+		// Handle removeOn* calls first
+		var sets = Tool._removeSets;
+		if (sets) {
+			// Always clear the drag set on mouseup
+			if (type === 'mouseup')
+				sets.mousedrag = null;
+			var set = sets[type];
+			if (set) {
+				for (var id in set) {
+					var item = set[id];
+					for (var key in sets) {
+						var other = sets[key];
+						if (other && other != set && other[item.getId()])
+							delete other[item.getId()];
+					}
+					item.remove();
+				}
+				sets[type] = null;
+			}
+		}
+		// Now handle event callbacks
 		var called = false;
 		switch (type) {
 		case 'mousedown':