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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
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#ifndef COMMANDS_H
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#define COMMANDS_H
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/** \cond docNever */
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#include <QUndoStack>
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#include "chunks.h"
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/*! CharCommand is a class to provid undo/redo functionality in QHexEdit.
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A QUndoCommand represents a single editing action on a document. CharCommand
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is responsable for manipulations on single chars. It can insert. overwrite and
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remove characters. A manipulation stores allways two actions
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1. redo (or do) action
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2. undo action.
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CharCommand also supports command compression via mergeWidht(). This allows
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the user to execute a undo command contation e.g. 3 steps in a single command.
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If you for example insert a new byt "34" this means for the editor doing 3
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steps: insert a "00", overwrite it with "03" and the overwrite it with "34". These
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3 steps are combined into a single step, insert a "34".
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The byte array oriented commands are just put into a set of single byte commands,
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which are pooled together with the macroBegin() and macroEnd() functionality of
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Qt's QUndoStack.
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*/
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class UndoStack : public QUndoStack
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{
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Q_OBJECT
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public:
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UndoStack(Chunks *chunks, QObject * parent=0);
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void insert(qint64 pos, char c);
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void insert(qint64 pos, const QByteArray &ba);
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void removeAt(qint64 pos, qint64 len=1);
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void overwrite(qint64 pos, char c);
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void overwrite(qint64 pos, int len, const QByteArray &ba);
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private:
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Chunks * _chunks;
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QObject * _parent;
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};
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/** \endcond docNever */
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#endif // COMMANDS_H
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