UT NE A31

- Added "Hex view..." action and dialog to preview the selected tree
item as hex without extracting it. Uses QHexEdit2 library by Simsys.

qhexedit2/commands.h

@@ -0,0 +1,47 @@
+#ifndef COMMANDS_H
+#define COMMANDS_H
+
+/** \cond docNever */
+
+#include <QUndoStack>
+
+#include "chunks.h"
+
+/*! CharCommand is a class to provid undo/redo functionality in QHexEdit.
+A QUndoCommand represents a single editing action on a document. CharCommand
+is responsable for manipulations on single chars. It can insert. overwrite and
+remove characters. A manipulation stores allways two actions
+1. redo (or do) action
+2. undo action.
+
+CharCommand also supports command compression via mergeWidht(). This allows
+the user to execute a undo command contation e.g. 3 steps in a single command.
+If you for example insert a new byt "34" this means for the editor doing 3
+steps: insert a "00", overwrite it with "03" and the overwrite it with "34". These
+3 steps are combined into a single step, insert a "34".
+
+The byte array oriented commands are just put into a set of single byte commands,
+which are pooled together with the macroBegin() and macroEnd() functionality of
+Qt's QUndoStack.
+*/
+
+class UndoStack : public QUndoStack
+{
+    Q_OBJECT
+
+public:
+    UndoStack(Chunks *chunks, QObject * parent=0);
+    void insert(qint64 pos, char c);
+    void insert(qint64 pos, const QByteArray &ba);
+    void removeAt(qint64 pos, qint64 len=1);
+    void overwrite(qint64 pos, char c);
+    void overwrite(qint64 pos, int len, const QByteArray &ba);
+
+private:
+    Chunks * _chunks;
+    QObject * _parent;
+};
+
+/** \endcond docNever */
+
+#endif // COMMANDS_H