Touch not working on qt application using waveshare screen

[kachhadiyatushar]

Hi,

I have slot which will be executed by pressing QPushbutton from screen. If I use mouse to press that button works but, not touch. Touch is only responding me the debug messages which I put in source code instead of button press slot work like mouse.

Thanks

[anda_skoa]

Well, your debug code clearly indicates that mouse events are being synthesized, so I am not sure how you arrived at the conclusion they are not.

Do the pressed() or released() signals of the button get emitted?

Do the mouse events have the correct target and coordinates?

Cheers,
_

[kachhadiyatushar]

Hi,

When I used mouse to press or click on QPushbutton that time it was emitted both clicked() and pressed() signals. Now, When I used touch for same operation that time both of this signal was not emitted.

Yes, mouse events have the correct target and coordinates.

Thanks

[anda_skoa]

Yes, mouse events have the correct target and coordinates.

And it is the same target and range of coordinates when you use the mouse?

I don't see how the mouse handling code in QPushButton could behave differently on where the events came from, i.e. whether they were synthesized or not.

Cheers,
_

[kachhadiyatushar]

Hi,

Here is the code I have used to capture events.

setAttribute(Qt::WA_AcceptTouchEvents,true);

bool CMainWindow::event(QEvent *ev)
{
int t = ev->type();
switch (t) {
case QEvent::MouseButtonPress:
qDebug()<<"Mouse button pressed";
break;
case QEvent::TouchBegin:
qDebug()<<"Touch Begin";
break;
case QEvent::MouseButtonDblClick:
qDebug()<<"Mouse button dbl click";
break;
case QEvent::MouseButtonRelease:
qDebug()<<"Mouse button release";
break;
case QEvent::TouchUpdate:
qDebug()<<"Touch Update";
break;
case QEvent::TouchCancel:
qDebug()<<"Touch Cancel";
break;
case QEvent::TouchEnd:
qDebug()<<"Touch End";
break;
}
if(t == QEvent::TouchBegin)
{
ev->accept();
return true;
}
else
return QWidget::event(ev);
}

void CMainWindow:n_lbl_i_clicked()
{
qDebug()<<"Click Signal Emitted";
}

void CMainWindow:n_lbl_i_pressed()
{
qDebug()<<"Press Signal Emitted";
}

Debug Logs of app when I press or click on button using mouse :-

Press Signal Emitted
Click Signal Emitted

Debug Logs of app when I press or click on button using touch :-

Touch Begin
Touch Update
Mouse button pressed
Touch Update
Touch Update
Touch Update
Touch Update
Touch End
Mouse button release

Also, I am getting mouse cursor on my application screen and it moves smooth everywhere and emits the click() and press() signal, If I click or press QPushbutton. The same aren't working using touch.

Thanks

[anda_skoa]

A few observations/questions:

* why are you intercepting the TouchBegin event?
* how did you determine that target and coordinates of the mouse events where OK?
* have you checked which events are actually delivered to the button?

Cheers,

[alexpaul]

I have slot which will be executed by pressing QPushbutton from screen. If I use mouse to press that button works but, not touch. Touch is only responding me the debug messages which I put in source code instead of button press slot work like mouse.