Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 93 insertions, 0 deletions

diff --git a/kalarm/undo.h b/kalarm/undo.h
new file mode 100644
index 00000000..99e06f97
--- /dev/null
+++ b/kalarm/undo.h
@@ -0,0 +1,93 @@
+/*
+ *  undo.h  -  undo/redo facility
+ *  Program:  kalarm
+ *  Copyright (C) 2005 by David Jarvie <software@astrojar.org.uk>
+ *
+ *  This program 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 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef UNDO_H
+#define UNDO_H
+
+/**  @file undo.h - undo/redo facility */
+
+#include <qvaluelist.h>
+#include <qstringlist.h>
+
+class KAEvent;
+class UndoItem;
+
+
+class Undo : public QObject
+{
+		Q_OBJECT
+	public:
+		enum Type { NONE, UNDO, REDO };
+
+		static Undo*       instance();
+		static void        saveAdd(const KAEvent&);
+		static void        saveEdit(const KAEvent& oldEvent, const KAEvent& newEvent);
+		static void        saveDelete(const KAEvent&);
+		static void        saveDeletes(const QValueList<KAEvent>&);
+		static void        saveReactivate(const KAEvent&);
+		static void        saveReactivates(const QValueList<KAEvent>&);
+		static bool        undo(QWidget* parent, const QString& action)
+		                                      { return undo(mUndoList.begin(), UNDO, parent, action); }
+		static bool        undo(int id, QWidget* parent, const QString& action)
+		                                      { return undo(findItem(id, UNDO), UNDO, parent, action); }
+		static bool        redo(QWidget* parent, const QString& action)
+		                                      { return undo(mRedoList.begin(), REDO, parent, action); }
+		static bool        redo(int id, QWidget* parent, const QString& action)
+		                                      { return undo(findItem(id, REDO), REDO, parent, action); }
+		static void        clear();
+		static bool        haveUndo()         { return !mUndoList.isEmpty(); }
+		static bool        haveRedo()         { return !mRedoList.isEmpty(); }
+		static QString     actionText(Type);
+		static QString     actionText(Type, int id);
+		static QString     description(Type, int id);
+		static QValueList<int> ids(Type);
+		static void        emitChanged();
+
+		// Types for use by UndoItem class and its descendants
+		typedef QValueList<UndoItem*>  List;
+
+	signals:
+		void               changed(const QString& undo, const QString& redo);
+
+	protected:
+		// Methods for use by UndoItem class
+		static void        add(UndoItem*, bool undo);
+		static void        remove(UndoItem*, bool undo);
+		static void        replace(UndoItem* old, UndoItem* New);
+
+	private:
+		typedef QValueList<UndoItem*>::Iterator Iterator;
+
+		Undo(QObject* parent)  : QObject(parent) { }
+		static void        removeRedos(const QString& eventID);
+		static bool        undo(Iterator, Type, QWidget* parent, const QString& action);
+		static UndoItem*   getItem(int id, Type);
+		static Iterator    findItem(int id, Type);
+		void               emitChanged(const QString& undo, const QString& redo)
+		                                   { emit changed(undo, redo); }
+
+		static Undo*       mInstance;     // the one and only Undo instance
+		static List        mUndoList;     // edit history for undo, latest undo first
+		static List        mRedoList;     // edit history for redo, latest redo first
+
+	friend class UndoItem;
+};
+
+#endif // UNDO_H