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113 lines
3.2 KiB
113 lines
3.2 KiB
14 years ago
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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Rosegarden
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A MIDI and audio sequencer and musical notation editor.
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This program is Copyright 2000-2008
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Guillaume Laurent <glaurent@telegraph-road.org>,
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Chris Cannam <cannam@all-day-breakfast.com>,
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Richard Bown <richard.bown@ferventsoftware.com>
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The moral rights of Guillaume Laurent, Chris Cannam, and Richard
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Bown to claim authorship of this work have been asserted.
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Other copyrights also apply to some parts of this work. Please
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see the AUTHORS file and individual file headers for details.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#ifndef _RG_BASICCOMMAND_H_
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#define _RG_BASICCOMMAND_H_
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#include "base/Segment.h"
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#include <kcommand.h>
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#include "base/Event.h"
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#include "misc/Debug.h"
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class QString;
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namespace Rosegarden
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{
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/**
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* BasicCommand is an abstract subclass of Command that manages undo,
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* redo and notification of changes within a contiguous region of a
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* single Rosegarden Segment, by brute force. When a subclass
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* of BasicCommand executes, it stores a copy of the events that are
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* modified by the command, ready to be restored verbatim on undo.
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*/
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class BasicCommand : public KNamedCommand
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{
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public:
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virtual ~BasicCommand();
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virtual void execute();
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virtual void unexecute();
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virtual Segment &getSegment();
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timeT getStartTime() { return m_startTime; }
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timeT getEndTime() { return m_endTime; }
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virtual timeT getRelayoutEndTime();
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protected:
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/**
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* You should pass "bruteForceRedoRequired = true" if your
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* subclass's implementation of modifySegment uses discrete
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* event pointers or segment iterators to determine which
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* events to modify, in which case it won't work when
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* replayed for redo because the pointers may no longer be
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* valid. In which case, BasicCommand will implement redo
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* much like undo, and will only call your modifySegment
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* the very first time the command object is executed.
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*
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* It is always safe to pass bruteForceRedoRequired true,
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* it's just normally a waste of memory.
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*/
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BasicCommand(const QString &name,
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Segment &segment,
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timeT start, timeT end,
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bool bruteForceRedoRequired = false);
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virtual void modifySegment() = 0;
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virtual void beginExecute();
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private:
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//--------------- Data members ---------------------------------
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void copyTo(Segment *);
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void copyFrom(Segment *);
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timeT calculateStartTime(timeT given,
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Segment &segment);
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timeT calculateEndTime(timeT given,
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Segment &segment);
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timeT m_startTime;
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timeT m_endTime;
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Segment &m_segment;
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Segment m_savedEvents;
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bool m_doBruteForceRedo;
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Segment *m_redoEvents;
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};
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}
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#endif
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