how to catch key combination inside keyPressEvent.

[babu198649]

hi
i want to catch a combination of keypresses inside keyPressEvent such as shift+K;
normally single key presses can be caught inside keyPressEvent using case statements .

how to catch combination of keypresses inside keyPressEvent.

[jpn]

See QKeyEvent docs.

Hint: Shift is so called modifier.

[babu198649]

i tried like the below and it did not worked. how to use the modifier inside keypressevent.

void GLWidget::keyPressEvent(QKeyEvent * event) {
	switch (event->key()) {
	case (Qt::Key_1):
		if (event->modifiers()==Qt::ShiftModifier)
			qDebug()<<"shift and one";
		break;
	}
}

void GLWidget::keyPressEvent(QKeyEvent * event) {
	switch (event->key()) {
	case (Qt::Key_1):
		if (event->modifiers()==Qt::ShiftModifier)
			qDebug()<<"shift and one";
		break;
	}
}

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[jpn]

That's the way keyboards work. When you press Shift+1, at least on western keyboards it produces an exclamation mark ("!"), not one ("1") right? There is Qt::Key_Exclam for that. You might be able to get Shift+1 when you use numpad.

[babu198649]

i want to enter in to a case(switch-case) when shift and one (Shift+1) is pressed .how do i do it inside keyPressEvent.

[jpn]

As I said, you can do it with the numpad only. And you will have to change the if-statement because Qt::KeypadModifier will be active as well:

if (event->modifiers() & Qt::ShiftModifier)
    ...

if (event->modifiers() & Qt::ShiftModifier)
    ...

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[babu198649]

thanks jpn it works,
is there any advantage in using bitwise AND operator in preference to == operator(although both works). How does the bitwise AND operator works here(ie. logic ) .