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diff --git a/libutil/include/siglist.h b/libutil/include/siglist.h
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+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SIGLIST_H
+#define SIGLIST_H
+
+#include <QObject>
+#include <QList>
+
+// A QList that allows emitting signals when the list changes.
+// Since QObject doesn't support templates, to use this class with a 
+// certain type, you should create a class deriving from SigList<T> and then
+// call the DEFINE_SIGLIST_SIGNALS(T) and SETUP_SIGLIST_SIGNALS(T) macros.
+template <typename T>
+class SigList : public QList<T>
+{
+	
+public:
+	explicit SigList() : QList<T>() {}
+	
+	virtual void append(const T &value);
+	virtual void append(const QList<T> &other);
+	
+	virtual void clear();
+	
+	virtual void erase(iterator pos);
+	virtual void erase(iterator first, iterator last);
+	
+	virtual void insert(int i, const T &t);
+	virtual void insert(iterator before, const T &t);
+	
+	virtual void move(int from, int to);
+	
+	virtual void pop_back() { takeLast(); }
+	virtual void pop_front() { takeFirst(); }
+	
+	virtual void push_back(const T &t) { append(t); }
+	virtual void push_front(const T &t) { prepend(t); }
+	
+	virtual void prepend(const T &t);
+	
+	virtual int removeAll(const T &t);
+	virtual bool removeOne(const T &t);
+	
+	virtual void removeAt(int i) { takeAt(i); }
+	virtual void removeFirst() { takeFirst(); }
+	virtual void removeLast() { takeLast(); }
+	
+	virtual void swap(QList<T> &other);
+	virtual void swap(int i, int j);
+	
+	virtual T takeAt(int i);
+	virtual T takeFirst();
+	virtual T takeLast();
+	
+	virtual QList<T> &operator +=(const QList<T> &other) { append(other); return *this; }
+	virtual QList<T> &operator +=(const T &value) { append(value); return *this; }
+	virtual QList<T> &operator <<(const QList<T> &other) { append(other); return *this; }
+	virtual QList<T> &operator <<(const T &value) { append(value); return *this; }
+	
+	virtual QList<T> &operator =(const QList<T> &other);
+	
+	
+	// Signal emitted after an item is added to the list. 
+	// Contains a reference to item and the item's new index.
+	virtual void onItemAdded(const T &item, int index) = 0;
+	
+	// Signal emitted after multiple items are added to the list at once.
+	// The items parameter is a const reference to a QList of the items that 
+	// were added.
+	// The firstIndex parameter is the new index of the first item added.
+	virtual void onItemsAdded(const QList<T> &items, int firstIndex) = 0;
+	
+	// Signal emitted after an item is removed to the list.
+	// Contains a reference to the item and the item's old index.
+	virtual void onItemRemoved(const T &item, int index) = 0;
+	
+	// Signal emitted after multiple items are removed from the list at once.
+	// The items parameter is a const reference to a QList of the items that 
+	// were added.
+	// The firstIndex parameter is the new index of the first item added.
+	virtual void onItemsRemoved(const QList<T> &items, int firstIndex) = 0;
+	
+	// Signal emitted after an item is moved to another index.
+	// Contains the item, the old index, and the new index.
+	virtual void onItemMoved(const T &item, int oldIndex, int newIndex) = 0;
+	
+	// Signal emitted after an operation that changes the whole list occurs.
+	// This signal should be treated as if all data in the entire list was cleared 
+	// and new data added in its place.
+	virtual void onInvalidated() = 0;
+};
+
+// Defines the signals for a SigList
+#define DEFINE_SIGLIST_SIGNALS(TYPE) \
+	Q_SIGNAL void itemAdded(TYPE const &item, int index);\
+	Q_SIGNAL void itemsAdded(const QList<TYPE> &items, int firstIndex);\
+	Q_SIGNAL void itemRemoved(TYPE const &item, int index);\
+	Q_SIGNAL void itemsRemoved(const QList<TYPE> &items, int firstIndex);\
+	Q_SIGNAL void itemMoved(TYPE const &item, int oldIndex, int newIndex);\
+	Q_SIGNAL void invalidated();
+
+// Overrides the onItem* functions and causes them to emit their corresponding 
+// signals.
+#define SETUP_SIGLIST_SIGNALS(TYPE) \
+	virtual void onItemAdded(TYPE const &item, int index)\
+	{ emit itemAdded(item, index); }\
+	virtual void onItemsAdded(const QList<TYPE> &items, int firstIndex)\
+	{ emit itemsAdded(items, firstIndex); }\
+	virtual void onItemRemoved(TYPE const &item, int index)\
+	{ emit itemRemoved(item, index); }\
+	virtual void onItemsRemoved(const QList<TYPE> &items, int firstIndex)\
+	{ emit itemsRemoved(items, firstIndex); }\
+	virtual void onItemMoved(TYPE const &item, int oldIndex, int newIndex)\
+	{ emit itemMoved(item, oldIndex, newIndex); }\
+	virtual void onInvalidated() { emit invalidated(); }
+
+#endif // SIGLIST_H