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-rw-r--r--kaddressbook/undo.cpp119
1 files changed, 119 insertions, 0 deletions
diff --git a/kaddressbook/undo.cpp b/kaddressbook/undo.cpp
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+++ b/kaddressbook/undo.cpp
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+/*
+ This file is part of KAddressBook.
+ Copyright (C) 1999 Don Sanders <sanders@kde.org>
+
+ 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ As a special exception, permission is given to link this program
+ with any edition of Qt, and distribute the resulting executable,
+ without including the source code for Qt in the source distribution.
+*/
+
+#include "undo.h"
+
+///////////////////////////////
+// StackBase
+
+void StackBase::push(Command *c)
+{
+ mCommandStack.push(c);
+ emit changed();
+}
+
+bool StackBase::isEmpty()
+{
+ return mCommandStack.isEmpty();
+}
+
+Command *StackBase::top()
+{
+ return mCommandStack.top();
+}
+
+void StackBase::clear()
+{
+ mCommandStack.clear();
+ emit changed();
+}
+
+Command *StackBase::pop()
+{
+ Command *c = mCommandStack.pop();
+ if (c)
+ emit changed();
+
+ return c;
+}
+
+///////////////////////////////
+// UndoStack
+
+UndoStack* UndoStack::instance_ = 0;
+
+UndoStack::UndoStack()
+ : StackBase()
+{
+ // setAutoDelete( true );
+}
+
+UndoStack* UndoStack::instance()
+{
+ if (!instance_)
+ instance_ = new UndoStack();
+ return instance_;
+}
+
+void UndoStack::undo()
+{
+ if (isEmpty())
+ return;
+
+ Command *command = pop();
+ command->undo();
+
+ RedoStack::instance()->push( command );
+}
+
+////////////////////
+// RedoStack
+
+RedoStack* RedoStack::instance_ = 0;
+
+RedoStack::RedoStack()
+{
+ mCommandStack.setAutoDelete( true );
+}
+
+RedoStack* RedoStack::instance()
+{
+ if (!instance_)
+ instance_ = new RedoStack();
+ return instance_;
+}
+
+void RedoStack::redo()
+{
+ Command *command;
+ if (isEmpty())
+ return;
+
+ command = pop();
+ command->redo();
+ UndoStack::instance()->push( command );
+}
+
+#ifndef KAB_EMBEDDED
+#include "undo.moc"
+#endif //KAB_EMBEDDED