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+/* This file is part of the KDE project
+ Copyright (C) 2001 Carsten Pfeiffer <[email protected]>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this library; see the file COPYING.LIB. If not, write to
+ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+#ifndef KHISTORYPROVIDER_H
+#define KHISTORYPROVIDER_H
+
+#include <tqdict.h>
+#include <tqobject.h>
+
+#include <tdelibs_export.h>
+
+namespace KParts {
+
+/**
+ * Basic class to manage a history of "items". This class is only meant
+ * for fast lookup, if an item is in the history or not.
+ *
+ * May be subclassed to implement a persistent history for example.
+ * For usage with tdehtml, just create your provider and call the
+ * HistoryProvider constructor _before_ you do any tdehtml stuff. That way,
+ * tdehtml, using the self()-method, will use your subclassed provider.
+ *
+ * @author Carsten Pfeiffer <[email protected]>
+ */
+class KPARTS_EXPORT HistoryProvider : public TQObject
+{
+ Q_OBJECT
+
+public:
+ static HistoryProvider * self();
+
+ /**
+ * Creates a KHistoryProvider with an optional parent and name
+ */
+ HistoryProvider( TQObject *parent = 0L, const char *name = 0 );
+
+ /**
+ * Destroys the provider.
+ */
+ virtual ~HistoryProvider();
+
+ /**
+ * @returns true if @p item is present in the history.
+ */
+ virtual bool contains( const TQString& item ) const;
+
+ /**
+ * Inserts @p item into the history.
+ */
+ virtual void insert( const TQString& item );
+
+ /**
+ * Removes @p item from the history.
+ */
+ virtual void remove( const TQString& item );
+
+ /**
+ * Clears the history. The cleared() signal is emitted after clearing.
+ */
+ virtual void clear();
+
+signals:
+ /**
+ * Emitted after the history has been cleared.
+ */
+ void cleared();
+
+ /**
+ * This signal is never emitted from this class, it is only meant as an
+ * interface for subclasses. Emit this signal to notify others that the
+ * history has changed. Put those items that were added or removed from the
+ * history into @p items.
+ */
+ void updated( const TQStringList& items );
+
+ /**
+ * Emitted after the item has been inserted
+ */
+ void inserted( const TQString& item );
+
+private:
+ static HistoryProvider *s_self;
+
+protected:
+ virtual void virtual_hook( int id, void* data );
+private:
+ class HistoryProviderPrivate;
+ HistoryProviderPrivate *d;
+};
+
+}
+
+#endif // KHISTORYPROVIDER_H