How to intercept the keyboard in QT?

Question

Programming

Imagine that I have a picture, I want to move it by pressing a key on the keyboard. Maybe I need to use slots, but how do I let the computer know that this or that key is pressed: D

Answer 1

stackoverflow.com/questions/12558988/qt-keypress-event

Answer 2

All Qt graphics classes in protected scope have different -event methods.
by default, event is passed to the child class. You need to override the appropriate method. For everything else here: doc.qt.io/qt-5/eventsandfilters.html

Answer 3

We add the keyPressEvent method to our class, and we ourselves call the appropriate methods / slots that will move the image:

void MainWindow::keyPressEvent(QKeyEvent *e)
{
    switch (e->key()) {
    case Qt::Key_Up:
        _image->up();
        break;
    case Qt::Key_Down:
        _image->down();
        break;
    case Qt::Key_Left:
        _image->left();
        break;
    case Qt::Key_Right:
        _image->right();
        break;
    }
}