Enable QWindowContainer on Android

[ChangeLog][Platform Specific Changes][Android] QWidget::createWindowContainer()
is now supported on Android for embedding OpenGL-based QWindows into widget UIs.

Task-number: QTBUG-59175
Change-Id: I84d3703bcd44c63b1fdfe6772b7f3de9d5c18ddf
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/widgets/kernel/qwindowcontainer.cpp b/src/widgets/kernel/qwindowcontainer.cpp
index bb25a3a986..e72479fd09 100644
--- a/src/widgets/kernel/qwindowcontainer.cpp
+++ b/src/widgets/kernel/qwindowcontainer.cpp
@@ -329,6 +329,19 @@ bool QWindowContainer::event(QEvent *e)
         e->accept();
         return true;
 #endif
+
+    case QEvent::Paint:
+    {
+        static bool needsPunch = !QGuiApplicationPrivate::platformIntegration()->hasCapability(
+            QPlatformIntegration::TopStackedNativeChildWindows);
+        if (needsPunch) {
+            QPainter p(this);
+            p.setCompositionMode(QPainter::CompositionMode_Source);
+            p.fillRect(rect(), Qt::transparent);
+        }
+        break;
+    }
+
     default:
         break;
     }