commands.cpp Example File

tools/undo/commands.cpp
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#include "commands.h" static const int setShapeRectCommandId = 1; static const int setShapeColorCommandId = 2; /****************************************************************************** ** AddShapeCommand */ AddShapeCommand::AddShapeCommand(Document *doc, const Shape &shape, QUndoCommand *parent) : QUndoCommand(parent) { m_doc = doc; m_shape = shape; } void AddShapeCommand::undo() { m_doc->deleteShape(m_shapeName); } void AddShapeCommand::redo() { // A shape only gets a name when it is inserted into a document m_shapeName = m_doc->addShape(m_shape); setText(QObject::tr("Add %1").arg(m_shapeName)); } /****************************************************************************** ** RemoveShapeCommand */ RemoveShapeCommand::RemoveShapeCommand(Document *doc, const QString &shapeName, QUndoCommand *parent) : QUndoCommand(parent) { setText(QObject::tr("Remove %1").arg(shapeName)); m_doc = doc; m_shape = doc->shape(shapeName); m_shapeName = shapeName; } void RemoveShapeCommand::undo() { m_shapeName = m_doc->addShape(m_shape); } void RemoveShapeCommand::redo() { m_doc->deleteShape(m_shapeName); } /****************************************************************************** ** SetShapeColorCommand */ SetShapeColorCommand::SetShapeColorCommand(Document *doc, const QString &shapeName, const QColor &color, QUndoCommand *parent) : QUndoCommand(parent) { setText(QObject::tr("Set %1's color").arg(shapeName)); m_doc = doc; m_shapeName = shapeName; m_oldColor = doc->shape(shapeName).color(); m_newColor = color; } void SetShapeColorCommand::undo() { m_doc->setShapeColor(m_shapeName, m_oldColor); } void SetShapeColorCommand::redo() { m_doc->setShapeColor(m_shapeName, m_newColor); } bool SetShapeColorCommand::mergeWith(const QUndoCommand *command) { if (command->id() != setShapeColorCommandId) return false; const SetShapeColorCommand *other = static_cast<const SetShapeColorCommand*>(command); if (m_shapeName != other->m_shapeName) return false; m_newColor = other->m_newColor; return true; } int SetShapeColorCommand::id() const { return setShapeColorCommandId; } /****************************************************************************** ** SetShapeRectCommand */ SetShapeRectCommand::SetShapeRectCommand(Document *doc, const QString &shapeName, const QRect &rect, QUndoCommand *parent) : QUndoCommand(parent) { setText(QObject::tr("Change %1's geometry").arg(shapeName)); m_doc = doc; m_shapeName = shapeName; m_oldRect = doc->shape(shapeName).rect(); m_newRect = rect; } void SetShapeRectCommand::undo() { m_doc->setShapeRect(m_shapeName, m_oldRect); } void SetShapeRectCommand::redo() { m_doc->setShapeRect(m_shapeName, m_newRect); } bool SetShapeRectCommand::mergeWith(const QUndoCommand *command) { if (command->id() != setShapeRectCommandId) return false; const SetShapeRectCommand *other = static_cast<const SetShapeRectCommand*>(command); if (m_shapeName != other->m_shapeName) return false; m_newRect = other->m_newRect; return true; } int SetShapeRectCommand::id() const { return setShapeRectCommandId; }