Enable the right stick to scroll the settings page. Fixes #220

app/gui/sdlgamepadkeynavigation.cpp

@@ -205,6 +205,31 @@ void SdlGamepadKeyNavigation::onPollingTimerFired()
             sendKey(QEvent::Type::KeyRelease, Qt::Key_Right);
             m_LastAxisNavigationEventTime = SDL_GetTicks();
         }
+
+        // In UI navigation mode (settings page), use the right stick to scroll
+        if (m_UiNavMode) {
+            short rightX = SDL_GameControllerGetAxis(gc, SDL_CONTROLLER_AXIS_RIGHTX);
+            short rightY = SDL_GameControllerGetAxis(gc, SDL_CONTROLLER_AXIS_RIGHTY);
+
+            QPoint wheelDelta;
+            if (rightX > 30000) {
+                wheelDelta.setX(30);
+            }
+            else if (rightX < -30000) {
+                wheelDelta.setX(-30);
+            }
+
+            if (rightY > 30000) {
+                wheelDelta.setY(-30);
+            }
+            else if (rightY < -30000) {
+                wheelDelta.setY(30);
+            }
+
+            if (!wheelDelta.isNull()) {
+                sendWheel(wheelDelta);
+            }
+        }
     }
 }
 
@@ -218,6 +243,18 @@ void SdlGamepadKeyNavigation::sendKey(QEvent::Type type, Qt::Key key, Qt::Keyboa
     }
 }
 
+void SdlGamepadKeyNavigation::sendWheel(QPoint& angleDelta)
+{
+    QGuiApplication* app = static_cast<QGuiApplication*>(QGuiApplication::instance());
+    QWindow* focusWindow = app->focusWindow();
+    if (focusWindow != nullptr) {
+        QPoint mousePos(focusWindow->width() / 2, focusWindow->height() / 2);
+        QPoint globalPos(focusWindow->mapToGlobal(mousePos));
+        QWheelEvent wheelEvent(mousePos, globalPos, QPoint(), angleDelta, 0, 0, Qt::NoScrollPhase, false, Qt::MouseEventSynthesizedByApplication);
+        app->sendEvent(focusWindow, &wheelEvent);
+    }
+}
+
 void SdlGamepadKeyNavigation::setUiNavMode(bool uiNavMode)
 {
     m_UiNavMode = uiNavMode;

app/gui/sdlgamepadkeynavigation.h

@@ -24,6 +24,7 @@ public:
 
 private:
     void sendKey(QEvent::Type type, Qt::Key key, Qt::KeyboardModifiers modifiers = Qt::NoModifier);
+    void sendWheel(QPoint& angleDelta);
 
 private slots:
     void onPollingTimerFired();