mirror of
https://github.com/crystalidea/qt6windows7.git
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128 lines
3.0 KiB
C++
128 lines
3.0 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "commands.h"
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#include "diagramitem.h"
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#include <QGraphicsScene>
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//! [0]
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MoveCommand::MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,
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QUndoCommand *parent)
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: QUndoCommand(parent), myDiagramItem(diagramItem)
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, myOldPos(oldPos), newPos(diagramItem->pos())
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{
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}
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//! [0]
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//! [1]
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bool MoveCommand::mergeWith(const QUndoCommand *command)
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{
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const MoveCommand *moveCommand = static_cast<const MoveCommand *>(command);
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DiagramItem *item = moveCommand->myDiagramItem;
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if (myDiagramItem != item)
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return false;
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newPos = item->pos();
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setText(QObject::tr("Move %1")
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.arg(createCommandString(myDiagramItem, newPos)));
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return true;
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}
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//! [1]
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//! [2]
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void MoveCommand::undo()
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{
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myDiagramItem->setPos(myOldPos);
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myDiagramItem->scene()->update();
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setText(QObject::tr("Move %1")
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.arg(createCommandString(myDiagramItem, newPos)));
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}
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//! [2]
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//! [3]
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void MoveCommand::redo()
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{
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myDiagramItem->setPos(newPos);
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setText(QObject::tr("Move %1")
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.arg(createCommandString(myDiagramItem, newPos)));
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}
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//! [3]
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//! [4]
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DeleteCommand::DeleteCommand(QGraphicsScene *scene, QUndoCommand *parent)
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: QUndoCommand(parent), myGraphicsScene(scene)
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{
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QList<QGraphicsItem *> list = myGraphicsScene->selectedItems();
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list.first()->setSelected(false);
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myDiagramItem = static_cast<DiagramItem *>(list.first());
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setText(QObject::tr("Delete %1")
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.arg(createCommandString(myDiagramItem, myDiagramItem->pos())));
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}
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//! [4]
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//! [5]
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void DeleteCommand::undo()
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{
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myGraphicsScene->addItem(myDiagramItem);
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myGraphicsScene->update();
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}
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//! [5]
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//! [6]
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void DeleteCommand::redo()
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{
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myGraphicsScene->removeItem(myDiagramItem);
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}
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//! [6]
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//! [7]
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AddCommand::AddCommand(DiagramItem::DiagramType addType,
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QGraphicsScene *scene, QUndoCommand *parent)
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: QUndoCommand(parent), myGraphicsScene(scene)
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{
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static int itemCount = 0;
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myDiagramItem = new DiagramItem(addType);
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initialPosition = QPointF((itemCount * 15) % int(scene->width()),
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(itemCount * 15) % int(scene->height()));
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scene->update();
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++itemCount;
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setText(QObject::tr("Add %1")
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.arg(createCommandString(myDiagramItem, initialPosition)));
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}
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//! [7]
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AddCommand::~AddCommand()
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{
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if (!myDiagramItem->scene())
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delete myDiagramItem;
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}
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//! [8]
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void AddCommand::undo()
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{
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myGraphicsScene->removeItem(myDiagramItem);
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myGraphicsScene->update();
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}
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//! [8]
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//! [9]
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void AddCommand::redo()
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{
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myGraphicsScene->addItem(myDiagramItem);
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myDiagramItem->setPos(initialPosition);
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myGraphicsScene->clearSelection();
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myGraphicsScene->update();
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}
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//! [9]
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QString createCommandString(DiagramItem *item, const QPointF &pos)
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{
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return QObject::tr("%1 at (%2, %3)")
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.arg(item->diagramType() == DiagramItem::Box ? "Box" : "Triangle")
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.arg(pos.x()).arg(pos.y());
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}
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