[UE4] UE에서의 Input 처리 플로우

Unreal4에서의 Input 처리에 대한 호출 플로우

(마우스 클릭 예시)

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1. FSlateApplication::OnMouseDown(const TSharedPtr< FGenericWindow >& PlatformWindow, const EMouseButtons::Type Button)

 

2. FSlateApplication::OnMouseDown( const TSharedPtr< FGenericWindow >& PlatformWindow, const EMouseButtons::Type Button, const FVector2D CursorPos )

 

3. FSlateApplication::ProcessMouseButtonDownEvent( const TSharedPtr< FGenericWindow >& PlatformWindow, const FPointerEvent& MouseEvent )

• Reply = RoutePointerDownEvent(WidgetsUnderCursor, MouseEvent);

 

4. FSlateApplication::RoutePointerDownEvent(const FWidgetPath& WidgetsUnderPointer, const FPointerEvent& PointerEvent)

• TargetWidget.Widget->OnMouseButtonDown( TargetWidget.Geometry, Event );
• 슬레이트 상단부터.. ex) 위젯... SceneViewport...

 

5-1. SWidget::OnMouseButtonDown( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )

• SButton::OnMouseButtonDown( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent ) ... 슬레이트 처리

 

5-2. SViewport::OnMouseButtonDown( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )

• FSceneViewport::OnMouseButtonDown( const FGeometry& InGeometry, const FPointerEvent& InMouseEvent )
• UGameViewportClient::InputKey(const FInputKeyEventArgs& EventArgs)
• APlayerController::InputKey(FKey Key, EInputEvent EventType, float AmountDepressed, bool bGamepad)
• UPlayerInput::InputKey(FKey Key, enum EInputEvent Event, float AmountDepressed, bool bGamepad) ... 이후 처리