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#pragma once
#include <QUndoCommand>
class UndoStack;
class Node;
class Datum;
class Graph;
class UndoCommand : public QUndoCommand
{
public:
UndoCommand(QUndoCommand* parent=NULL);
/*
* Sets the internal 'stack' pointer for this command
* and recursively for child commands
*/
void setStack(UndoStack* s) { setStack(s, this); }
/*
* Functions to be overloaded by derived classes
*/
virtual void swapPointer(Node*, Node*) const {}
virtual void swapPointer(Datum*, Datum*) const {}
virtual void swapPointer(Graph*, Graph*) const {}
protected:
/*
* If the given command is an UndoCommand, set its stack pointer;
* recurse over all children in any case.
*/
static void setStack(UndoStack* s, const QUndoCommand* cmd);
/*
* Backwards pointer to parent stack
*
* Used so that commands can ask the stack to rewrite pointers
* (e.g. when undoing Node deletion, any other commands in the stack
* that refer to that Node by pointer must be updated)
*/
mutable UndoStack* stack;
};
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