added QGraphicsSystemScreen::topLevelAt(): find the window at a global position

This is used to determine which widget to send a pointer event to, and to
implement QApplication::widgetAt().

1 files changed, 13 insertions, 0 deletions

diff --git a/src/gui/painting/qgraphicssystem.cpp b/src/gui/painting/qgraphicssystem.cpp
index 2071127fcb..948223d3b3 100644
--- a/src/gui/painting/qgraphicssystem.cpp
+++ b/src/gui/painting/qgraphicssystem.cpp
@@ -85,6 +85,19 @@ QPixmapData *QGraphicsSystem::createDefaultPixmapData(QPixmapData::PixelType typ
 }
 
 #ifdef Q_WS_LITE
+QWidget *QGraphicsSystemScreen::topLevelAt(const QPoint & pos) const
+{
+    QWidgetList list = QApplication::topLevelWidgets();
+    for (int i = list.size()-1; i >= 0; --i) {
+        QWidget *w = list[i];
+        //### mask is ignored
+        if (w != QApplication::desktop() && w->isVisible() && w->geometry().contains(pos))
+            return w;
+    }
+
+    return 0;
+}
+
 QList<QGraphicsSystemScreen *> QGraphicsSystem::screens() const
 {
     return QList<QGraphicsSystemScreen *>();