Qt 5.12 Unable To Get Touch Events

[duhanayan]

I am working on very complicated Qt project. I have a GL screen on my app and I want it to be zoomed in/out with touch screen moves. But unfortunetly I can't handle touch events.

I added a line to accept touch events to my constructor.

setAttribute(Qt::WA_AcceptTouchEvents, true);

And here is my event function under protected that I print events that happened.

class MyWidget: public QGLWidget
{
	Q_OBJECT
protected:
		bool event(QEvent *event) override
	{
	    // Print the event type
	    qDebug() << "Event Type: " << event->type();

	    if (event->type() == QEvent::TouchBegin || event->type() == QEvent::TouchUpdate || event->type() == QEvent::TouchEnd) {
	        QTouchEvent *touchEvent = static_cast<QTouchEvent*>(event);

	        QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints();

	        if (touchPoints.count() == 2) {
	            QTouchEvent::TouchPoint touchPoint1 = touchPoints.at(0);
	            QTouchEvent::TouchPoint touchPoint2 = touchPoints.at(1);

	            qDebug() << "Touch 1: " << touchPoint1.pos();
	            qDebug() << "Touch 2: " << touchPoint2.pos();
	        }
	        return true;
	    }
	    return QWidget::event(event);
	}

And I added this line to my main function:

app.setAttribute(Qt::AA_SynthesizeTouchForUnhandledMouseEvents);

When I try to touch from touch screen, what printed in output is QEvent::MouseButtonPress.

So anyone know what to do, I would be grateful.

[Axel Spoerl]

@duhanayan said in Qt 5.12 Unable To Get Touch Events:

AA_SynthesizeTouchForUnhandledMouseEvents

That is a known bug, unfortunately.
It won´t be fixed in 5.12, but everything works in Qt 6.

[Christian Ehrlicher]

@Axel-Spoerl So you can close the bug :)

[Axel Spoerl]

@Christian-Ehrlicher
Done, Sir :-)
I was just not sure, whether the fix happened in 5.15 or 6.2.
The latter it is.