我正在尝试在多文档界面中撤销/重做。我有不同的实体,每个实体都有自己的类。我已经使用了UndoGroup,但当我无法将它们推入undoStack时,不知道出了什么问题。有人可以帮助我解决这个问题吗?
cadgraphicscene.cpp
我不明白为什么我无法将实体推送到undoStack中。请帮助我解决这个问题。
cadgraphicscene.cpp
CadGraphicsView::CadGraphicsView()
{
undoStack = new QUndoStack(this);
}
QUndoStack *CadGraphicsView::m_undoStack() const
{
return undoStack;
}
void CadGraphicsView::showUndoStack()
{
undoView = 0;
// shows the undoStack window
if (undoView == 0)
{
undoView = new QUndoView(undoStack);
undoView->setWindowTitle("Undo Stack");
}
undoView->show();
}
mainwindow.cpp
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
m_undoGroup = new QUndoGroup(this);
QAction *undoAction = m_undoGroup->createUndoAction(this);
undoAction->setShortcut(QKeySequence::Undo);
QAction *redoAction = m_undoGroup->createRedoAction(this);
redoAction->setShortcut(QKeySequence::Redo);
menuEdit->insertAction(menuEdit->actions().at(1), undoAction);
menuEdit->insertAction(undoAction, redoAction);
menuEdit->addAction(undoAction);
menuEdit->addAction(redoAction);
undoAction->setEnabled(true);
redoAction->setEnabled(true);
}
void MainWindow::updateActions()
{
CadGraphicsView *view = currentDocument();
m_undoGroup->setActiveStack(view == 0 ? 0 : view->m_undoStack());
}
void MainWindow::addDocument(CadGraphicsView *view)
{
m_undoGroup->addStack(view->m_undoStack());
connect(view->m_undoStack(), SIGNAL(indexChanged(int)), this, SLOT(updateActions()));
connect(view->m_undoStack(), SIGNAL(cleanChanged(bool)), this, SLOT(updateActions()));
setCurrentDocument(view);
}
void MainWindow::setCurrentDocument(CadGraphicsView *view)
{
mdiArea->currentSubWindow();
}
CadGraphicsView *MainWindow::currentDocument() const
{
return qobject_cast<CadGraphicsView *>(mdiArea->parentWidget());
}
我不明白为什么我无法将实体推送到undoStack中。请帮助我解决这个问题。
#include <QMdiSubWindow>
。 - vahanchomdiArea->activeSubWindow()->widget()
是否为空。 - vahancho