How to consume QEvent::WindowBlocked so that specific window is always active?

Question

I created myself simple window for debugging purposes. It's completely separate QMainWindow , so that I can put it on the other monitor when testing the app. But when there's a dialog in my application, I cannot access the window. Right now, this is exactly the time I WANT to access it.

I tried to override QWidget::event like so:

DebugWindow.h

#include <QtWidgets/QMainWindow>
QT_BEGIN_NAMESPACE
class QEvent;
QT_END_NAMESPACE
class DebugWindow : public QMainWindow
{
    Q_OBJECT
public:
    DebugWindow(QWidget *parent = 0);
    virtual ~DebugWindow();

protected:
    virtual bool event(QEvent*);
};

DebugWindow.cpp

bool TechadminScript::event(QEvent* e)
{
    if (e->type() == QEvent::WindowBlocked) {
        // accept the event to stop propagation
        e->accept();
        return true;
    }
    return false;
}

I have set up breakpoint in the overriden function and it was hit - that means I did something right. But the window is still blocked as it was before.

So I am probably missing something, can somebody help me finish this?

Answer 1

It worked for me setting the window modality as @king_nak suggested. Mind you have to hide() beforehand and show() according to the documentation: https://doc.qt.io/qt-5/qwidget.html#windowModality-prop

bool Object::eventFilter(QObject *, QEvent * const event)
{
  if (event->type() != QEvent::WindowBlocked)
    return false;

  for (auto&& widget : qApp->topLevelWidgets())
  {
    if (!widget->isModal())
      continue;

    widget->hide();
    widget->setWindowModality(Qt::NonModal);
    widget->show();
  }

  return true;
}