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, 2 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index 4e319c2326..8dd3810463 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -217,6 +217,8 @@ static inline unsigned parseOptions(const QStringList &paramList,
             options |= QWindowsIntegration::NoNativeMenus;
         } else if (param == QLatin1String("nowmpointer")) {
             options |= QWindowsIntegration::DontUseWMPointer;
+        } else if (param == QLatin1String("reverse")) {
+            options |= QWindowsIntegration::RtlEnabled;
         } else {
             qWarning() << "Unknown option" << param;
         }