Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "commands.h"
++ #include "diagramitem.h"
++
++ #include <QGraphicsScene>
++
++ //! [0]
++ MoveCommand::MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,
++ QUndoCommand *parent)
++ : QUndoCommand(parent), myDiagramItem(diagramItem)
++ , myOldPos(oldPos), newPos(diagramItem->pos())
++ {
++ }
++ //! [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()
++ {
++ myGraphicsScene->removeItem(myDiagramItem);
++ }
++ //! [6]
++
++ //! [7]
++ AddCommand::AddCommand(DiagramItem::DiagramType addType,
++ QGraphicsScene *scene, QUndoCommand *parent)
++ : QUndoCommand(parent), myGraphicsScene(scene)
++ {
++ static int itemCount = 0;
++
++ myDiagramItem = new DiagramItem(addType);
++ initialPosition = QPointF((itemCount * 15) % int(scene->width()),
++ (itemCount * 15) % int(scene->height()));
++ scene->update();
++ ++itemCount;
++ setText(QObject::tr("Add %1")
++ .arg(createCommandString(myDiagramItem, initialPosition)));
++ }
++ //! [7]
++
++ AddCommand::~AddCommand()
++ {
++ if (!myDiagramItem->scene())
++ delete myDiagramItem;
++ }
++
++ //! [8]
++ void AddCommand::undo()
++ {
++ myGraphicsScene->removeItem(myDiagramItem);
++ myGraphicsScene->update();
++ }
++ //! [8]
++
++ //! [9]
++ void AddCommand::redo()
++ {
++ myGraphicsScene->addItem(myDiagramItem);
++ myDiagramItem->setPos(initialPosition);
++ myGraphicsScene->clearSelection();
++ myGraphicsScene->update();
++ }
++ //! [9]
++
++ QString createCommandString(DiagramItem *item, const QPointF &pos)
++ {
++ return QObject::tr("%1 at (%2, %3)")
++ .arg(item->diagramType() == DiagramItem::Box ? "Box" : "Triangle")
++ .arg(pos.x()).arg(pos.y());
++ }