source: trunk/examples/tools/undoframework/commands.cpp@ 296

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#include <QtGui>

#include "commands.h"
#include "diagramitem.h"

//! [0]
MoveCommand::MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,
                 QUndoCommand *parent)
    : QUndoCommand(parent)
{
    myDiagramItem = diagramItem;
    newPos = diagramItem->pos();
    myOldPos = oldPos;
}
//! [0]

//! [1]
bool MoveCommand::mergeWith(const QUndoCommand *command)
{
    const MoveCommand *moveCommand = static_cast<const MoveCommand *>(command);
    DiagramItem *item = moveCommand->myDiagramItem;

    if (myDiagramItem != item)
    return false;

    newPos = item->pos();
    setText(QObject::tr("Move %1")
        .arg(createCommandString(myDiagramItem, newPos)));

    return true;
}
//! [1]

//! [2]
void MoveCommand::undo()
{
    myDiagramItem->setPos(myOldPos);
    myDiagramItem->scene()->update();
    setText(QObject::tr("Move %1")
        .arg(createCommandString(myDiagramItem, newPos)));
}
//! [2]

//! [3]
void MoveCommand::redo()
{
    myDiagramItem->setPos(newPos);
    setText(QObject::tr("Move %1")
        .arg(createCommandString(myDiagramItem, newPos)));
}
//! [3]

//! [4]
DeleteCommand::DeleteCommand(QGraphicsScene *scene, QUndoCommand *parent)
    : QUndoCommand(parent)
{
    myGraphicsScene = scene;
    QList<QGraphicsItem *> list = myGraphicsScene->selectedItems();
    list.first()->setSelected(false);
    myDiagramItem = static_cast<DiagramItem *>(list.first());
    setText(QObject::tr("Delete %1")
        .arg(createCommandString(myDiagramItem, myDiagramItem->pos())));
}
//! [4]

//! [5]
void DeleteCommand::undo()
{
    myGraphicsScene->addItem(myDiagramItem);
    myGraphicsScene->update();
}
//! [5]

//! [6]
void DeleteCommand::redo()
{