Forward touchEvents to children inside QGraphicsProxyWidget

Just sending the event to the embedded widget is not enough, we
have to perform hit-testing for the different touch points, and
send the event to the child widget under the point. Fortunately,
QApplicationPrivate::translateRawTouchEvent provides the logic
that generates multiple events for groups of touch points.

Since that helper always sent events spontaneously, add an
optional parameter to allow sending of non-spontaneous events.

Add a test case that simulates touch events to different widget
configurations inside a QGraphicsProxyWidget.

Fixes: QTBUG-67819
Task-number: QTBUG-45737
Pick-to: 6.2 6.1 5.15
Change-Id: Iffd5c84c64ee2ceadc7e31863675fdf227582c81
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 9 insertions, 8 deletions

diff --git a/src/widgets/graphicsview/qgraphicsproxywidget.cpp b/src/widgets/graphicsview/qgraphicsproxywidget.cpp
index cb19b32763..84a8c979f6 100644
--- a/src/widgets/graphicsview/qgraphicsproxywidget.cpp
+++ b/src/widgets/graphicsview/qgraphicsproxywidget.cpp
@@ -920,16 +920,17 @@ bool QGraphicsProxyWidget::event(QEvent *event)
     case QEvent::TouchBegin:
     case QEvent::TouchUpdate:
     case QEvent::TouchEnd: {
-        if (event->spontaneous())
-            qt_sendSpontaneousEvent(d->widget, event);
-        else
-            QCoreApplication::sendEvent(d->widget, event);
-
-        if (event->isAccepted())
+        QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
+        auto touchPoints = touchEvent->points();
+        bool res = QApplicationPrivate::translateRawTouchEvent(d->widget, touchEvent->pointingDevice(),
+                                                               touchPoints, touchEvent->timestamp(),
+                                                               event->spontaneous());
+        if (res) {
+            event->accept();
             return true;
-
+        }
         break;
-   }
+    }
     default:
         break;
     }