QTouchEvent : No TouchBegin if I don't Move or Up

BenjaminLong

Hi all,
I have a problem handling QTouchEvent.

I call QWidget::setAttribute(Qt::WA_AcceptTouchEvents);
I receive QEvent::TouchBegin QEvent::TouchUpdate QEvent::TouchEnd

But, if i touch the screen without moving at all, I receive the touchBegin only when I up my finger ( and i receive the TouchEnd event just after)
How can I do to receive the TouchBegin event once I touch the screen?

Thank you for your answers.

agocs

What platform, which Qt version, what kind of hardware? Normally you should receive the TouchBegin immediately, what you describe is indeed quite odd.

BenjaminLong

I work on Windows Seven with Qt4.6.3 and NVIDIA Quadro 600.
I notice that I had the same problem with Windows Seven event but I solved it using TWF_WANTPALM flag.
Thank you.

BenjaminLong

Up!
I haven't found any correct solution!

Thanks

6l20

Same problem here, tried 5.x.x till 5.2.1 versions, Panasonic CF-C1, Windows 7 64bit.
Thanks

6l20

Ok, sorry, I didn't saw BenjaminLong BenjaminLong solution.
Then I confirm this will work after QMainWindow::show :
@
WId wid = my_mindow->winId();
if ( !RegisterTouchWindow((HWND)wid,TWF_WANTPALM) )
{
qWarning() << "RegisterTouchWindow failed !";
}
@

TY

BenjaminLong

Yes but this is a solution for Windows API.
For Qt, I've only used :
@setAttribute(Qt::WA_AcceptTouchEvents);@

@6120 : You have the correct behaviour I descrided with Qt?

6l20

I'm using Qt ... on Windows ...

For my case I couldn't get any contextMenuEvent.
I have checked the received event of my widget and I had the same strange behaviour as you described in your first post...
adding TWF_WANTPALM on the native handle of my mainwindow solved it, now I receive TouchEvents immediately and contextMenuEvents are working fine.

I also noticed some dificulties with drag and drop, I have to check If that is solving the problem.

Regards