get Gestures in QWindow

[Xv1nX]

I have a program with Qmainwindow as root. In Qmainwindow I created a MainWidget inherited from Qwidget, which acts like my layout. This MainWidget contains a Qwindow, where I draw opengl directly. Now I want that my Qwindow get gestures event, if I run my program on a window tablet.
Would I get gestures event in my MainWidget and can manually tell my Qwindow?
If not, can I create a transparent qwidget over my Qwindow and get gestures events?
Thanks in advance

[SGaist]

Hi,

IIRC if you want to handle gesture in widgets you should take a look at this chapter of Qt's documentation.

Hope it helps

[Xv1nX]

@SGaist
Thanks for your reply, but i am not sure how to get gesture events to my QWindow, since QWindow is not support QGesture.

[SGaist]

Why about using your main window as a "proxy" to your QWindow ?

[Xv1nX]

@SGaist
i tried but the Qmainwindow doesn't get the GestureEvents if i do it over the QWindow. I can confirm that QmainWindow does receive GestureEvent, if i perform gesture on another window like a QDockWindow, which also has Qmainwindow as parent.
Any suggestion is appreciated. Thanks

[SGaist]

By the way, why not use QOpenGLWidget rather than QWindow since you are using widgets anyway ?

[Xv1nX]

@SGaist
I used all possibilities: QGLWidget, QOpenGLWidget, QOpenGLWindow and manually Qwindow+QOpenGlContext. The latter is much smoother and lightweight than others. I also have to use Qwindow.

Another Question:
How do I get WM_GESTURE in nativeEvent? All I get are WM_Touch events.
There is no QNativeGestureEvent, too.

Do you have any advices regarding following ideas:

• use a Qwidget in a new window and make it transparent. Overlap this window with over my application to get gesture.
• detect all needed gestures my myself from touch events
• try to get messages in WinPrc (my app is only for Windows).

Which way is the better one?
Thanks in advance

[SGaist]

What's WinPrc ?

For your ideas, what should your application do ?

[Xv1nX]

@SGaist
i am thinking about monitoring windows message by myself to filter wm_gesture.
something like this:
https://ic3man5.wordpress.com/2012/04/29/monitoring-microsoft-windows-messages-using-qt-4-8/

The development guideline for Touch Gesture on msdn.microsoft.com said, one can only get either WM_Touch or WM_Gesture. And it seems QT always get the WM_Touch events. I may have to unregister the app for getting touch events.

My app is a ported programm from old win32. it contains a main are, where i draw OpenGL on a QWindow by myself. now it should get multitouch features to manipulate the content.

[Xv1nX]

I found out the solution using native Windows Gestures WM_Gesture.
By default QT registers QMainWindow-Window as a Touch Window, so the QMainWindow-App only get WM_Touch events.
As said above one can only get either WM_Touch event or WM_Gesture event. So you have to unregister the window from getting Touch event. I do that in the constructor like this:

HWND myHwnd = reinterpret_cast<HWND>(this->winId());
PULONG flag = 0;
bool istouch = IsTouchWindow(myHwnd,flag);
if(istouch)
	UnregisterTouchWindow(myHwnd);

now i get WM_Gesture events in nativeEvent:

   	bool OpenGLWindow::nativeEvent(const QByteArray & eventType, void* message, long* result)
{
	MSG* msg = reinterpret_cast<MSG*>(message);
	switch(msg->message){
	case WM_GESTURE:
	case WM_GESTURENOTIFY:
		emit sendNativeEvent(eventType, message, result);
		break;
	}
	return false;
}

Thanks for your help.