Remove more calls to deprecated TouchPoint functions

Followup to ed3ed0b9db97a8fab0c03add23228b6b0a96f171
68916fede41d1eca5d07eb6b1db518d41a007616 and
3c159957f863cf8d367a9261e7016e52cd0348c1.

In QWindowSystemInterfacePrivate::fromNativeTouchPoints() and
QWindowSystemInterfacePrivate::toNativeTouchPoints() we continue using
struct TouchPoint's QRectF area as storage for the screen position +
ellipse diameters; as the comment says, this is _unrotated_, meaning
that rotation is stored separately, and area should not be construed as
the bounding box of the rotated ellipse. (In Qt 6 we can make the
QPA touchpoint look the same as the QTouchEvent::TouchPoint to
eliminate the need to calculate the center of the rect.)

In QGraphicsScenePrivate::updateTouchPointsForItem(), setRect() sets the
position and the ellipse diameters, but the latter is redundant because
the purpose of this function is to localize a touchpoint to the
coordinate system of a particular QGraphicsItem.  Ellipse diameters
should stay the same.

In QApplicationPrivate::updateTouchPointsForWidget(), as in
QGraphicsScene, we are localizing touchpoints to a widget
and to the screen that the widget is shown on, so only the position
needs to be set, while preserving the sub-pixel resolution that
mapFromGlobal(QPoint) loses.

Fixes: QTBUG-83403
Change-Id: I61d29e14cbe38567767b164af6ae895082c5e1a1
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index 80e4aa525e..4ea70096e8 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -4168,7 +4168,7 @@ bool QApplicationPrivate::updateTouchPointsForWidget(QWidget *widget, QTouchEven
         QTouchEvent::TouchPoint &touchPoint = touchEvent->_touchPoints[i];
 
         // preserve the sub-pixel resolution
-        const QPointF screenPos = touchPoint.screenRect().center();
+        const QPointF screenPos = touchPoint.screenPos();
         const QPointF delta = screenPos - screenPos.toPoint();
 
         touchPoint.d->pos = widget->mapFromGlobal(screenPos.toPoint()) + delta;