71 lines
1.9 KiB
C
71 lines
1.9 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 <QUndoCommand>
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#include "xbytearray.h"
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/*! CharCommand is a class to prived 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. replace and
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remove characters. A manipulation stores allways to 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", replace it with "03" and the replace it with "34". These
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3 steps are combined into a single step, insert a "34".
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*/
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class CharCommand : public QUndoCommand
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{
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public:
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enum { Id = 1234 };
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enum Cmd {insert, remove, replace};
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CharCommand(XByteArray * xData, Cmd cmd, int charPos, char newChar,
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QUndoCommand *parent=0);
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void undo();
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void redo();
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bool mergeWith(const QUndoCommand *command);
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int id() const { return Id; }
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private:
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XByteArray * _xData;
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int _charPos;
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bool _wasChanged;
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char _newChar;
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char _oldChar;
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Cmd _cmd;
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};
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/*! ArrayCommand provides undo/redo functionality for handling binary strings. It
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can undo/redo insert, replace and remove binary strins (QByteArrays).
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*/
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class ArrayCommand : public QUndoCommand
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{
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public:
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enum Cmd {insert, remove, replace};
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ArrayCommand(XByteArray * xData, Cmd cmd, int baPos, QByteArray newBa=QByteArray(), int len=0,
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QUndoCommand *parent=0);
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void undo();
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void redo();
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private:
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Cmd _cmd;
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XByteArray * _xData;
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int _baPos;
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int _len;
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QByteArray _wasChanged;
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QByteArray _newBa;
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QByteArray _oldBa;
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};
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/** \endcond docNever */
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#endif // COMMANDS_H
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