automate QCompleter selection

[ottawaDan]

Good afternoon,

We have implemented a test-mode for the application we have developed. Essentially, when the test mode is selected, a separate thread is launched and we are using QMetaObject::invokeMethod( ...) on the different controls to simulate user interaction, entries, and so on. The SW also uses QStateMachine framework.

A recent change includes the use of QCompleter on a QLineEdit, and QState transitions when the QLineEdit is modified and a selection is made is based on QSignalTransition as shown here

class AutoCompleterTransition : public QSignalTransition
{
public:
    AutoCompleterTransition( AcquisitionWindow* acquisitionWindow, QCompleter* completer)
        : QSignalTransition( completer, SIGNAL( activated( const QModelIndex&))),
          m_acquisitionWindow( acquisitionWindow),
          m_completer( completer)
    {
    }
 
    virtual bool eventTest( QEvent *e)
    {
        if (!QSignalTransition::eventTest( e))
            return false;
        QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);
        QModelIndex modelIndex = se->arguments().at( 0).value<QModelIndex>();
        return( modelIndex.isValid());
    }
 
    virtual void onTransition( QEvent *e)
    {
        QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);
        QModelIndex modelIndex = se->arguments().at( 0).value<QModelIndex>();
        m_acquisitionWindow->insertCompletion( modelIndex);
        qDebug( "%s: model index: row: %d, col: %d",
                __FUNC_NAME__, modelIndex.row(), modelIndex.column());
    }
 
private:
    AcquisitionWindow*      m_acquisitionWindow;
    QCompleter*             m_complete
};

class AutoCompleterTransition : public QSignalTransition
{
public:
    AutoCompleterTransition( AcquisitionWindow* acquisitionWindow, QCompleter* completer)
        : QSignalTransition( completer, SIGNAL( activated( const QModelIndex&))),
          m_acquisitionWindow( acquisitionWindow),
          m_completer( completer)
    {
    }

    virtual bool eventTest( QEvent *e)
    {
        if (!QSignalTransition::eventTest( e))
            return false;
        QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);
        QModelIndex modelIndex = se->arguments().at( 0).value<QModelIndex>();
        return( modelIndex.isValid());
    }

    virtual void onTransition( QEvent *e)
    {
        QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);
        QModelIndex modelIndex = se->arguments().at( 0).value<QModelIndex>();
        m_acquisitionWindow->insertCompletion( modelIndex);
        qDebug( "%s: model index: row: %d, col: %d",
                __FUNC_NAME__, modelIndex.row(), modelIndex.column());
    }

private:
    AcquisitionWindow*      m_acquisitionWindow;
    QCompleter*             m_complete
};

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Where the completer is instantiated and initialized as follow:

selectCompleter = new QCompleter( this);
    model = new QStandardItemModel( selectCompleter);
 
    selectCompleter->setCompletionMode( QCompleter::PopupCompletion);
    selectCompleter->setModel( model);
    selectCompleter->setModelSorting( QCompleter::CaseInsensitivelySortedModel);
    selectCompleter->setCaseSensitivity( Qt::CaseInsensitive);
    selectCompleter->setWrapAround( true);
 
    QTreeView* popupView = new QTreeView;
    selectCompleter->setPopup( popupView);
 
    popupView->setSelectionMode( QAbstractItemView::SingleSelection);
    popupView->setSelectionBehavior( QAbstractItemView::SelectRows);
    popupView->setEditTriggers( QAbstractItemView::NoEditTriggers);
    popupView->setAlternatingRowColors( true);
 
    popupView->setRootIsDecorated(false);
    popupView->header()->hide();
    popupView->header()->setStretchLastSection( false);

selectCompleter = new QCompleter( this);
    model = new QStandardItemModel( selectCompleter);

    selectCompleter->setCompletionMode( QCompleter::PopupCompletion);
    selectCompleter->setModel( model);
    selectCompleter->setModelSorting( QCompleter::CaseInsensitivelySortedModel);
    selectCompleter->setCaseSensitivity( Qt::CaseInsensitive);
    selectCompleter->setWrapAround( true);

    QTreeView* popupView = new QTreeView;
    selectCompleter->setPopup( popupView);

    popupView->setSelectionMode( QAbstractItemView::SingleSelection);
    popupView->setSelectionBehavior( QAbstractItemView::SelectRows);
    popupView->setEditTriggers( QAbstractItemView::NoEditTriggers);
    popupView->setAlternatingRowColors( true);

    popupView->setRootIsDecorated(false);
    popupView->header()->hide();
    popupView->header()->setStretchLastSection( false);

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This QState transition works well when running in 'normal' mode, but in 'test mode', I cannot trigger the transition. I have tried different approaches; changing the setCompletionMode to QCompleter::InlineCompletion; using QCompleter::setCurrentIndex( 0) to select the first entry in the popup for instance without success. Note that after call QCompleter::setCurrentIndex( 0), QModelIndex modelIndex = completer->currentIndex() reports the correct selection.

How can I then simulate the selection in the popup?

Thanks in advance
Daniel

[ottawaDan]

Hi again,

I guess another way to look at this problem is 'how to programmatically make a selection in a QTreeView (that is the pop-up view used in this example) using QMetaObject::invokeMethod( ...)?"

My investigation continues and I will report back if I find a solution. Meanwhile, your help is much appreciated.

Daniel

[ottawaDan]

Here is the code used to automate the selection from the QCompleter popup (using QTreeView)

QCompleter* completer = patientInputWidget->txtLastName->completer();
if (completer) {
    // The QCompleter has been set, force the selection of the first entry
    completer->setCurrentRow( 0);
    QModelIndex modelIndex = completer->currentIndex();
    QMetaObject::invokeMethod( completer, "activated", Qt::BlockingQueuedConnection, Q_ARG( QModelIndex, modelIndex));
    ...
}

QCompleter* completer = patientInputWidget->txtLastName->completer();
if (completer) {
    // The QCompleter has been set, force the selection of the first entry
    completer->setCurrentRow( 0);
    QModelIndex modelIndex = completer->currentIndex();
    QMetaObject::invokeMethod( completer, "activated", Qt::BlockingQueuedConnection, Q_ARG( QModelIndex, modelIndex));
    ...
}

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This code is executed on a different thread than the GUI thread.