Shawn is correct, that Qt5 DOES NOT Support multiple pointers in concurrent use. Qt 5.x (and earlier) have made a very fundamental choice at design time (of Qt itself): A GUI Application cannot be working (concurrently) with more than one Pointer Device.
There is a "Pointer Focus", which is conceptually almost the same as "Keyboard Focus." But, because Mouse (and Touchpad) devices provide us with location information (via "Move" Events), Qt automatically moves the Focus for you: Focus occurs on the Widget (or Element) which is under the Pointer's location. When another kind of Mouse Event occurs, if that Widget/Element does not accept and handle the Event, then it will be passed to the Element's parent, and finally to the QGuiApplication itself. That is the only "focusPolicy", and it works very well (IMO). When you have a need to somehow "Pass a Mouse Event Differently", you do that using Signal/Slot, or by accepting then Event in an event Filter, and then sending an entirely new Mouse Event to the desired Widget. This is automatic, and there are no Pointer Methods analogous to setFocus() for Keyboards Devices. With Keyboards, you need a focus policy to move between widgets/elements. And quite often, you do need to explicitly setFocus() for the Keyboard - because the Policy doesn't go where you want it to, or takes too many steps to get there. The important thing to keep in mind is: There is only ONE pointer Device, and it actually DOES have a "focus" property. Although Xi 2.x can support concurrent Pointers, Multiple Pointers in the same Qt Application, e.g. a Game of "Pong" with two mice playing in the same Gui Window, would require some relatively big API changes. Such changes will never be supported in Qt5. (Although this could perhaps be a feature in a new Qt Major Release.) On 03/06/2013 06:26 AM, Rutledge Shawn wrote: > On 6 Mar 2013, at 2:38 PM, Casimiro, Daniel C CIV NUWC NWPT wrote: > Hi, > > I wrote a input plugin for Qt 5 that parses TUIO. I think that it is pretty > useful. The code is available on github at: > > https://github.com/dancasimiro/qtuiotouch > > Documentation: > The documentation is sparse, but the code is based on the multi-touch input > plugin that is shipped with Qt. > > Testing: > My plugin has only been tested on Red Hat Enterprise Linux 6. I am using > multi-touch hardware from Perceptive Pixel and the TUIO server distributed > with their drivers. > > Dependencies: > - Qt 5 > - Boost ASIO > > Known bugs: > - I want to improve the latency in tracking fingers in Qt Quick 2 applications > - The plugin must be manually loaded by passing "-plugin TuioTouch" to your > application > That sounds like fun. > > I think we don't support multi-pointer X, but if you have a big touch table > and multiple users, it's a similar scenario. So I suppose you can drag and > pinch multiple items at once, but cannot give keyboard focus to multiple > items at once, right? > > Is it possible that xinput 2.2 could work with this hardware, if someone > wrote the X driver for it? Because we already support that kind of > multi-point touch without any plugins. But maybe the tagged objects are too > special, not ordinary touch points. > > Can you tell more about your application to use this? _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
