Add new input device processor

Source/Integration/InputDeviceTracker.cpp

@@ -0,0 +1,105 @@
+
+#include "InputDeviceTracker.h"
+#include "Framework/Application/SlateApplication.h"
+#include "GenericPlatform/GenericApplicationMessageHandler.h"
+#include "InputCoreTypes.h"
+
+// Last observed device classification. Read with no
+// synchronization; updates happen on the game thread
+// from Slate's input pipeline, and stale reads on
+// other threads are acceptable for this use case.
+//
+static ElxControllerType GLastControllerType = ElxControllerType::KeyboardMouse;
+
+// Keywords identifying a PlayStation-family gamepad.
+// Matched case-insensitively against the InputDeviceName
+// and HardwareDeviceIdentifier fields of the current
+// FInputDeviceScope.
+//
+static const TCHAR* const PlaystationKeywords[] = {
+	TEXT("Playstation"),
+	TEXT("PS3"),
+	TEXT("PS4"),
+	TEXT("PS5"),
+	TEXT("PS6"),
+	TEXT("PS7"),
+	TEXT("Dualsense"),
+	TEXT("Dualshock"),
+};
+
+namespace
+{
+	bool ContainsAnyPlaystationKeyword(const FString& Haystack)
+	{
+		for (const TCHAR* Keyword : PlaystationKeywords)
+		{
+			if (Haystack.Contains(Keyword, ESearchCase::IgnoreCase))
+			{
+				return true;
+			}
+		}
+		return false;
+	}
+
+	// Classifies the active gamepad by scanning the current
+	// FInputDeviceScope. Defaults to Xbox; switches to
+	// PlayStation only on a keyword match.
+	//
+	ElxControllerType ClassifyGamepadFromScope()
+	{
+		const FInputDeviceScope* Scope = FInputDeviceScope::GetCurrent();
+		if (Scope != nullptr)
+		{
+			if (ContainsAnyPlaystationKeyword(Scope->InputDeviceName.ToString()) ||
+				ContainsAnyPlaystationKeyword(Scope->HardwareDeviceIdentifier))
+			{
+				return ElxControllerType::PlayStationGamepad;
+			}
+		}
+		return ElxControllerType::XboxGamepad;
+	}
+}
+
+bool FInputDeviceTrackerProcessor::HandleKeyDownEvent(FSlateApplication& SlateApp, const FKeyEvent& KeyEvent)
+{
+	if (KeyEvent.GetKey().IsGamepadKey())
+	{
+		GLastControllerType = ClassifyGamepadFromScope();
+	}
+	else
+	{
+		GLastControllerType = ElxControllerType::KeyboardMouse;
+	}
+	return false;
+}
+
+bool FInputDeviceTrackerProcessor::HandleMouseButtonDownEvent(FSlateApplication& SlateApp, const FPointerEvent& MouseEvent)
+{
+	GLastControllerType = ElxControllerType::KeyboardMouse;
+	return false;
+}
+
+void UlxInputDeviceTracker::Initialize(FSubsystemCollectionBase& Collection)
+{
+	Super::Initialize(Collection);
+	if (FSlateApplication::IsInitialized())
+	{
+		Processor = MakeShared<FInputDeviceTrackerProcessor>();
+		FSlateApplication::Get().RegisterInputPreProcessor(Processor);
+	}
+}
+
+void UlxInputDeviceTracker::Deinitialize()
+{
+	if (Processor.IsValid() && FSlateApplication::IsInitialized())
+	{
+		FSlateApplication::Get().UnregisterInputPreProcessor(Processor);
+	}
+	Processor.Reset();
+	Super::Deinitialize();
+}
+
+ElxControllerType UlxInputDeviceTracker::GetLastControllerType()
+{
+	return GLastControllerType;
+}