From 0da448c5a74ee87fedea3dfbd53eae143833bfc2 Mon Sep 17 00:00:00 2001
From: "Uwe L. Korn" <uwelk@xhochy.com>
Date: Sun, 25 Aug 2013 11:59:05 +0200
Subject: [PATCH] Add WeakObjectList helper class

---
 src/libtomahawk/utils/WeakObjectList.cpp | 52 +++++++++++++
 src/libtomahawk/utils/WeakObjectList.h   | 95 ++++++++++++++++++++++++
 2 files changed, 147 insertions(+)
 create mode 100644 src/libtomahawk/utils/WeakObjectList.cpp
 create mode 100644 src/libtomahawk/utils/WeakObjectList.h

diff --git a/src/libtomahawk/utils/WeakObjectList.cpp b/src/libtomahawk/utils/WeakObjectList.cpp
new file mode 100644
index 000000000..5c2bea2d7
--- /dev/null
+++ b/src/libtomahawk/utils/WeakObjectList.cpp
@@ -0,0 +1,52 @@
+/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
+ *
+ *   Copyright 2013, Uwe L. Korn <uwelk@xhochy.com>
+ *
+ *   Tomahawk is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tomahawk is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Tomahawk. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "WeakObjectList.h"
+
+namespace Tomahawk {
+namespace Utils {
+
+
+void
+WeakObjectListBase::remove( QObject* object )
+{
+    Q_UNUSED( object );
+    // Nothing to do here
+}
+
+
+WeakObjectListBase::~WeakObjectListBase()
+{
+}
+
+
+WeakObjectListPrivate::WeakObjectListPrivate( WeakObjectListBase* parent )
+    : QObject( 0 )
+    , m_parent( parent )
+{
+}
+
+
+void
+WeakObjectListPrivate::remove( QObject* object )
+{
+    m_parent->remove( object );
+}
+
+} // namespace Utils
+} // namespace Tomahawk
diff --git a/src/libtomahawk/utils/WeakObjectList.h b/src/libtomahawk/utils/WeakObjectList.h
new file mode 100644
index 000000000..4358cd92d
--- /dev/null
+++ b/src/libtomahawk/utils/WeakObjectList.h
@@ -0,0 +1,95 @@
+/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
+ *
+ *   Copyright 2013, Uwe L. Korn <uwelk@xhochy.com>
+ *
+ *   Tomahawk is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tomahawk is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Tomahawk. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TOMAHAWK_UTILS_WEAKOBJECTLIST_H
+#define TOMAHAWK_UTILS_WEAKOBJECTLIST_H
+
+
+#include <QList>
+#include <QObject>
+#include <QWeakPointer>
+
+
+namespace Tomahawk {
+namespace Utils {
+
+class WeakObjectListBase
+{
+public:
+    virtual void remove( QObject* object );
+    virtual ~WeakObjectListBase();
+protected:
+    WeakObjectListBase() {}
+};
+
+class WeakObjectListPrivate : public QObject
+{
+    Q_OBJECT
+public:
+    WeakObjectListPrivate( WeakObjectListBase* parent );
+
+public slots:
+    void remove( QObject* object );
+
+private:
+    WeakObjectListBase* m_parent;
+};
+
+template<class T>
+class WeakObjectList : public WeakObjectListBase
+{
+    typedef QWeakPointer<T> wptr;
+public:
+    WeakObjectList() : m_private( this ) {}
+
+    WeakObjectList( const WeakObjectList& list )
+        : m_list( list.m_list )
+        , m_private( this )
+    {
+    }
+
+    void insert( const QSharedPointer<T>& value )
+    {
+        m_private.connect( value.data(), SIGNAL( destroyed( QObject* ) ), &m_private, SLOT( remove( QObject* )) );
+        m_list.append( value.toWeakRef() );
+    }
+
+    const QList<wptr>& list() { return m_list; }
+    QMutableListIterator< wptr > iter() { return QMutableListIterator< wptr >( m_list ); }
+    virtual void remove( QObject* object )
+    {
+        QMutableListIterator< wptr > iter( m_list );
+        while ( iter.hasNext() )
+        {
+            wptr ptr = iter.next();
+            if ( ptr.data() == object || ptr.isNull() )
+            {
+                iter.remove();
+            }
+        }
+    }
+
+private:
+    QList< wptr > m_list;
+    WeakObjectListPrivate m_private;
+};
+
+} // namespace Utils
+} // namespace Tomahawk
+
+#endif // TOMAHAWK_UTILS_WEAKOBJECTLIST_H