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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(typename QList<T>::iterator pos);
virtual void erase(typename QList<T>::iterator first, typename QList<T>::iterator last);
virtual void insert(int i, const T &t);
virtual void insert(typename QList<T>::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);
protected:
// 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
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