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memento_command.h style. git-svn-id: svn://localhost/ardour2/branches/3.0@4648 d708f5d6-7413-0410-9779-e7cbd77b26cf
99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
/*
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Copyright (C) 2006 Paul Davis
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Author: Hans Fugal
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __lib_pbd_memento_command_h__
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#define __lib_pbd_memento_command_h__
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#include <iostream>
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#include <pbd/command.h>
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#include <pbd/stacktrace.h>
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#include <pbd/xml++.h>
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#include <pbd/shiva.h>
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#include <sigc++/slot.h>
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#include <typeinfo>
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/** This command class is initialized with before and after mementos
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* (from Stateful::get_state()), so undo becomes restoring the before
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* memento, and redo is restoring the after memento.
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*/
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template <class obj_T>
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class MementoCommand : public Command
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{
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public:
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MementoCommand(obj_T& a_object, XMLNode* a_before, XMLNode* a_after)
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: obj(a_object), before(a_before), after(a_after)
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{
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/* catch destruction of the object */
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new PBD::PairedShiva< obj_T,MementoCommand<obj_T> > (obj, *this);
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}
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~MementoCommand () {
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GoingAway(); /* EMIT SIGNAL */
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delete before;
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delete after;
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}
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void operator() () {
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if (after) {
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obj.set_state(*after);
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}
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}
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void undo() {
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if (before) {
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obj.set_state(*before);
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}
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}
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virtual XMLNode &get_state() {
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string name;
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if (before && after) {
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name = "MementoCommand";
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} else if (before) {
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name = "MementoUndoCommand";
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} else {
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name = "MementoRedoCommand";
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}
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XMLNode* node = new XMLNode(name);
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node->add_property("obj_id", obj.id().to_s());
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node->add_property("type_name", typeid(obj).name());
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if (before) {
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node->add_child_copy(*before);
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}
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if (after) {
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node->add_child_copy(*after);
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}
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return *node;
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}
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protected:
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obj_T& obj;
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XMLNode* before;
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XMLNode* after;
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};
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#endif // __lib_pbd_memento_h__
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