Windows QPA: Fix RTL window title bars

Add a platform option to the plugin (-platform windows:reverse) that
enables reverse mode. It sets WS_EX_LAYOUTRTL on RTL windows, forces normal
orientation on all HDCs created for the window, fixes
ClientToScreen()/ScreenToClient() accordingly and transforms mouse events.

[ChangeLog][Platform Specific Changes][Windows] It is now possible
to enable RTL mode by passing the option -platform windows:reverse.

Fixes: QTBUG-28463
Change-Id: I4d70818b2fd315d4e8d5627eab11ae912c6e77be
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: André de la Rocha <andre.rocha@qt.io>
 
 
 
 

1 files changed, 7 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowspointerhandler.cpp b/src/plugins/platforms/windows/qwindowspointerhandler.cpp
index b730dbcf3b..0e686bfb10 100644
--- a/src/plugins/platforms/windows/qwindowspointerhandler.cpp
+++ b/src/plugins/platforms/windows/qwindowspointerhandler.cpp
@@ -688,7 +688,13 @@ bool QWindowsPointerHandler::translateMouseEvent(QWindow *window,
 {
     *result = 0;
 
-    const QPoint eventPos(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    QPoint eventPos(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    if ((et & QtWindows::NonClientEventFlag) == 0 && QWindowsBaseWindow::isRtlLayout(hwnd))  {
+        RECT clientArea;
+        GetClientRect(hwnd, &clientArea);
+        eventPos.setX(clientArea.right - eventPos.x());
+    }
+
     QPoint localPos;
     QPoint globalPos;