tst_foreignwindow: Add basic test of foreign window reparenting

Pick-to: 6.6
Change-Id: I008fad0f6527503a13ded4818eec5cb280f65cf4
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

2 files changed, 30 insertions, 0 deletions

diff --git a/tests/auto/gui/kernel/qwindow/tst_foreignwindow.cpp b/tests/auto/gui/kernel/qwindow/tst_foreignwindow.cpp
index dc82d8b833..04c70e5fee 100644
--- a/tests/auto/gui/kernel/qwindow/tst_foreignwindow.cpp
+++ b/tests/auto/gui/kernel/qwindow/tst_foreignwindow.cpp
@@ -23,6 +23,8 @@ private slots:
 
     void fromWinId();
     void initialState();
+
+    void embedForeignWindow();
 };
 
 void tst_ForeignWindow::fromWinId()
@@ -67,5 +69,22 @@ void tst_ForeignWindow::initialState()
     QCOMPARE(foreignWindow->geometry(), initialGeometry);
 }
 
+void tst_ForeignWindow::embedForeignWindow()
+{
+    // A foreign window embedded into a Qt UI requires that the rest of Qt
+    // is to be able to treat the foreign child window as any other window
+    // that it can show, hide, stack, and move around.
+
+    QWindow parentWindow;
+
+    NativeWindow nativeWindow;
+    QVERIFY(nativeWindow);
+
+    // As a prerequisite to that, we must be able to reparent the foreign window
+    std::unique_ptr<QWindow> foreignWindow(QWindow::fromWinId(nativeWindow));
+    foreignWindow.release()->setParent(&parentWindow);
+    QCOMPARE(nativeWindow.parentWinId(), parentWindow.winId());
+}
+
 #include <tst_foreignwindow.moc>
 QTEST_MAIN(tst_ForeignWindow)
diff --git a/tests/shared/nativewindow.h b/tests/shared/nativewindow.h
index 6b3ffe0897..4b2aff0cdd 100644
--- a/tests/shared/nativewindow.h
+++ b/tests/shared/nativewindow.h
@@ -18,6 +18,7 @@ public:
     ~NativeWindow();
 
     operator WId() const { return reinterpret_cast<WId>(m_handle); }
+    WId parentWinId() const;
 
     void setGeometry(const QRect &rect);
     QRect geometry() const;
@@ -69,6 +70,11 @@ QRect NativeWindow::geometry() const
     return QRectF::fromCGRect(m_handle.frame).toRect();
 }
 
+WId NativeWindow::parentWinId() const
+{
+    return WId(m_handle.superview);
+}
+
 #elif defined(Q_OS_WIN)
 
 NativeWindow::NativeWindow()
@@ -107,6 +113,11 @@ QRect NativeWindow::geometry() const
     return {};
 }
 
+WId NativeWindow::parentWinId() const
+{
+    return WId(GetAncestor(m_handle, GA_PARENT));
+}
+
 #endif
 
 #endif // NATIVEWINDOW_H