[Interest] [QtGui] Clip cursor position

[Nye]

Hello Jan,
Thanks for the suggestion, but I'm not really convinced that this'd help,
since installing an event filter on the application object is effectively
doing the same thing as grabbing the mouse (at least while the mouse is
over an application window). Additionally the "grabMouse" runs into the
trouble that I'd have to manually dispatch the messages to their
corresponding widgets and it doesn't really prevent the mouse from leaving
an area (or widget/window), it just ensures that the particular widget will
get all mouse events (whether or not they occur in its client area). In
windows the API seems to allow the behavior I'm after (
https://msdn.microsoft.com/en-us/library/windows/desktop/ms648383(v=vs.85).aspx)
but I'm not sure if this is even possible for X11.

Kind regards,
Konstantin.

On Tue, Dec 22, 2015 at 12:52 PM, Jan Dasselaar <jan at altus-escon.com> wrote:

> Hello Nye,
>
> Maybe you can use the QWidget::grabMouse() function for that.
> This in combination with an overlay widget (visible but fully transparent)
> over your application.
>
> Regards,
> Jan
>
>
> On 22-12-2015 10:44, Nye wrote:
>
> Hello,
> Is it possible to clip the mouse cursor to a specific area of the screen?
> I've tried to limit the cursor movement by installing an event filter on
> the application object and moving it back when its position got outside of
> my target rectangle, but the results proved to be unsatisfactory, as there
> is considerable "flicker". I then dig deeper and tried installing a window
> system event handler on QWindowSystemInterfacePrivate by subclassing the
> QWindowSystemEventHandler class available, reimplementing the sendEvent()
> function, and plugging that in the appropriate place, but (as expected) the
> behavior was only marginally better. I'm considering changing the
> QPlatformWindow and trying to do it directly from there (actually from
> QXcbWindow) but decided to ask first if there is actually a better way. Any
> input is highly appreciated.
>
> Kind regards.
>
>
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