Windows QPA: Add option to detect AltGr key presses

According to MSDN, AltGr key presses are sent as a
sequence of SYS left Ctrl + right Alt.

Add an option to detect AltGr as modifier key.

Task-number: QTBUG-69317
Change-Id: I30ce169d2e6dbbae194ff714abfbc732b53652ce
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index 1a1d51cae1..4824de5c9c 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -198,6 +198,8 @@ static inline unsigned parseOptions(const QStringList &paramList,
             } else if (param.endsWith(QLatin1String("none"))) {
                 options |= QWindowsIntegration::NoNativeDialogs;
             }
+        } else if (param == QLatin1String("altgr")) {
+            options |= QWindowsIntegration::DetectAltGrModifier;
         } else if (param == QLatin1String("gl=gdi")) {
             options |= QWindowsIntegration::DisableArb;
         } else if (param == QLatin1String("nodirectwrite")) {
@@ -269,6 +271,7 @@ QWindowsIntegration::QWindowsIntegration(const QStringList &paramList) :
     d->m_clipboard.registerViewer();
 #endif
     d->m_context.screenManager().handleScreenChanges();
+    d->m_context.setDetectAltGrModifier((d->m_options & DetectAltGrModifier) != 0);
 }
 
 QWindowsIntegration::~QWindowsIntegration()