How to get multiple key presses in single event?

Question

I am creating an application, where "Left Arrow + Down Arrow" press has different behavior ( It is not same as first left arrow and then left arrow ), currently in keyPressEvent event I am getting them one by one in two separate calls.

Is there any way by which I can get multiple keypress in one keyboard event?

Are you sure they are not |'ed together when you hold them both together? — RedX, Aug 24 '11 at 14:19
Duplicate of http://stackoverflow.com/questions/3081091/qt-multiple-key-combo-event — RedX, Aug 24 '11 at 14:36

score 12 · Answer 1 · answered May 12 '12 at 23:35

Thanks for this. I am posting code for the Python (PyQt) equivalent so that someone else might find it useful.

def keyPressEvent(self, event):
    self.firstrelease = True
    astr = "pressed: " + str(event.key())
    self.keylist.append(astr)

def keyReleaseEvent(self, event):
    if self.firstrelease == True: 
        self.processmultikeys(self.keylist)

    self.firstrelease = False

    del self.keylist[-1]

def processmultikeys(self,keyspressed):
    print keyspressed

score 9 · Accepted Answer · answered Aug 24 '11 at 14:46

I solved the problem by below code.

QSet<Qt::Key> keysPressed;

void Widget::keyPressEvent(QKeyEvent * event) {
    m_bFirstRelease = true;
    keysPressed+= event->key();
}

void Widget::keyReleaseEvent(QKeyEvent *) {
    if(m_bFirstRelease) {
        processMultiKeys(keysPressed);
    }
    m_bFirstRelease = false;
    keysPressed-= event->key();
}

score 1 · Answer 3 · answered Aug 24 '11 at 14:20

1

Nothing is "at the same time" and I believe in Qt you can't have that type of behaviour (except for modifier keys like shift, alt, etc).

Approach the problem in a different way. When you receive one of the keys, check to see if you received the other in a short while back, say 20ms before.

answered Aug 24 '11 at 14:20

Vinicius Kamakura

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It is a very useful information about the key combination in Qt key press event. – Jeet Feb 26 '16 at 07:23

How to get multiple key presses in single event?

3 Answers3

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