QPushButton & shortcut

Question

Hey everyone,

I have a problem with Qt 4.6.0 and shortcut for QPushButtons :

I want to display a special text in a QTextEdit when the user clicks a button, but only when the button is pressed, as soon as it's released, i want another text to come up.

Everything works fine but now I want to add a shortCut (let's say F1) to perform the exact same operation, when I push F1 it displays something special in a QTextEdit 'til I release the key. How do I manage to do this ?

I added the shortCut on my button, but when I press F1, it's blinking, it's like as long as I press F1, lots of signals are being emitted... I want my QTextEdit to change when I press F1 and then change back when I release the key...

I hope my question is clear !

Thanks a lot in advance for your advices !

Answer 1

I think the most simple solution to this problem is to use installEventFilter() on the parent object (the window), and filter out the QEvent::MouseButtonPress and QEvent::MouseButtonRelease events.

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
 if (obj == textEdit) {
     if (event->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
         qDebug() << "Ate key press" << keyEvent->key();
         return true;
     } else {
         return false;
     }
 } else {
     // pass the event on to the parent class
     return QMainWindow::eventFilter(obj, event);
 }
}

Answer 2

A push button emits the signal clicked() when it is activated by the mouse, the Spacebar or by a keyboard shortcut. You'll have to handle key press and key release to do what you want.