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Diffstat (limited to 'examples/tools/undoframework/commands.cpp')
-rw-r--r-- | examples/tools/undoframework/commands.cpp | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/examples/tools/undoframework/commands.cpp b/examples/tools/undoframework/commands.cpp new file mode 100644 index 0000000000..ff7b0b7f1d --- /dev/null +++ b/examples/tools/undoframework/commands.cpp @@ -0,0 +1,168 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor +** the names of its contributors may be used to endorse or promote +** products derived from this software without specific prior written +** permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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() +{ + myGraphicsScene->removeItem(myDiagramItem); +} +//! [6] + +//! [7] +AddCommand::AddCommand(DiagramItem::DiagramType addType, + QGraphicsScene *scene, QUndoCommand *parent) + : QUndoCommand(parent) +{ + static int itemCount = 0; + + myGraphicsScene = scene; + 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()); +} |