[SOLVED] create Undo/Redo actions



  • Hello. I'm trying to use qt undo/redo functionality in my app. I read example documentation and follow steps:

    1. Create stack and Undo/redo actions

    undoStack = new QUndoStack(this);
    QAction *undoAction = undoStack->createUndoAction(this, tr("&Undo"));
    undoAction->setShortcuts(QKeySequence::Undo);

    QAction *redoAction = undoStack->createRedoAction(this, tr("&Redo"));
    redoAction->setShortcuts(QKeySequence::Redo);

    ui.menuEdit->addAction(undoAction);
    ui.menuEdit->addAction(redoAction);

    1. When I close tab (QTabWidget) this code executes

    QUndoCommand *ucCloseTab = new CloseTabCommand(this, (QTabWidget *)ui.tabWidget->widget(TabNumber), ui.treeForms->topLevelItem(TabNumber), NULL);
    undoStack->push(ucCloseTab);

    After push executes redo() of my QUndoCommand class. But actions undo and redo in menu still disabled. Should they enable automatically, when undoStack is not empty? If I set it enabled, triggering actions doesn't execute undo() or redo(). Thanks


  • Moderators

    you need to connect your action to the undo-stack object:
    @
    connect(undoStack , SIGNAL(canRedoChanged(bool)), redoAction, SLOT(setEnabled(bool)));
    @
    and of course do the same analog for undoAction.


Log in to reply
 

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.