InverseMouseArea does not work with TouchEvents

[Albert Astals Cid]

When debugging a problem with InverseMouseArea use in Unity8 I have come to the realization that what InverseMouseAreaType::eventFilter is getting is only TouchEvents and since there's no filter for them they seem to be ignored.

One could argue that this is a bug in QQuickWindowPrivate::translateTouchToMouse that should make sure the synthetized mouse events from the touch events pass through the event filters, but not really sure.

Thoughts?

[Daniel d'Andrada (dandrader)]

QTouchEvents do not go through QQuickItem::event and therefore they cannot be filtered like that. QQuickWindows feeds them directly to QQuickEvent::touchEvent. Inconsistent, if you ask me.

[Albert Astals Cid (aacid)]

InverseMouseAreaType is filtering events at the application level, so InverseMouseAreaType::eventFilter gets the touch events.

So to rephrase what I said, we can either catch and process the touchevents at InverseMouseAreaType::eventFilter where we do have them or say QQuickWindowPrivate::translateTouchToMouse to be buggy by not reinserting the mouseevents at the global level and fix it that way.

Obviously catching them at the InverseMouseAreaType::eventFilter is "the easy route"

[Daniel d'Andrada (dandrader)]

FYI: I'll propose a patch to make QTouchEvents go through the item's event() method (and therefore make it "filterable") like any other QEvent. Let's see if that goes through...

[Daniel d'Andrada (dandrader)]

There's actually a QT bug about it: https://bugreports.qt-project.org/browse/QTBUG-32004

[Zsombor Egri (zsombi)]

If touch events will be converted into mouse events, then InverseMouseArea will also deal with those.

[Zsombor Egri (zsombi)]

Fixed in Qt5.1.0