Add a structure to hold undo commands

Add the undocommands.cpp / undocommands.h files, which will hold a
collection of classes that will hold undo commands.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/undocommands.cpp

@@ -0,0 +1,16 @@
+#include "undocommands.h"
+
+UndoDeleteDive::UndoDeleteDive(QList<dive *> diveList)
+{
+
+}
+
+void UndoDeleteDive::undo()
+{
+
+}
+
+void UndoDeleteDive::redo()
+{
+
+}

qt-ui/undocommands.h

@@ -0,0 +1,17 @@
+#ifndef UNDOCOMMANDS_H
+#define UNDOCOMMANDS_H
+
+#include <QUndoCommand>
+#include "dive.h"
+
+class UndoDeleteDive : public QUndoCommand {
+public:
+	UndoDeleteDive(QList<struct dive*> diveList);
+	virtual void undo();
+	virtual void redo();
+
+private:
+	QList<struct dive*> dives;
+};
+
+#endif // UNDOCOMMANDS_H