qt: Disable alt key menu navigation with style override

src/qt/CMakeLists.txt

@@ -92,6 +92,9 @@ add_library(ui STATIC
     qt_soundgain.cpp
     qt_soundgain.ui
 
+    qt_styleoverride.cpp
+    qt_styleoverride.hpp
+
     ../qt_resources.qrc
 )
 if (APPLE)

src/qt/qt_main.cpp

@@ -27,7 +27,7 @@ Q_IMPORT_PLUGIN(QWindowsVistaStylePlugin)
 
 #include "qt_mainwindow.hpp"
 #include "cocoa_mouse.hpp"
-
+#include "qt_styleoverride.hpp"
 
 // Void Cast
 #define VC(x) const_cast<wchar_t*>(x)
@@ -89,6 +89,7 @@ main_thread_fn()
 
 int main(int argc, char* argv[]) {
     QApplication app(argc, argv);
+    app.setStyle(new StyleOverride());
 #ifdef __APPLE__
     CocoaEventFilter cocoafilter;
     app.installNativeEventFilter(&cocoafilter);

src/qt/qt_styleoverride.cpp

@@ -0,0 +1,14 @@
+#include "qt_styleoverride.hpp"
+
+int StyleOverride::styleHint(
+        StyleHint hint,
+        const QStyleOption *option,
+        const QWidget *widget,
+        QStyleHintReturn *returnData) const
+{
+    /* Disable using menu with alt key */
+    if (hint == QStyle::SH_MenuBar_AltKeyNavigation)
+        return 0;
+
+    return QProxyStyle::styleHint(hint, option, widget, returnData);
+}

src/qt/qt_styleoverride.hpp

@@ -0,0 +1,16 @@
+#ifndef QT_STYLEOVERRIDE_HPP
+#define QT_STYLEOVERRIDE_HPP
+
+#include <QProxyStyle>
+
+class StyleOverride : public QProxyStyle
+{
+public:
+    int styleHint(
+        StyleHint hint,
+        const QStyleOption *option = nullptr,
+        const QWidget *widget = nullptr,
+        QStyleHintReturn *returnData = nullptr) const override;
+};
+
+#endif