UE4在Editor下的按键响应

通过FSlateApplication的委托实现：

#include "SLevelViewport.h"

void FMatAbsorbModule::StartupModule()
{
    FDelegateHandle TickerHandle = FTicker::GetCoreTicker().AddTicker(FTickerDelegate::CreateRaw(this,  &FMatAbsorbModule::MyTick), 0.0f);
    FSlateApplication::Get().OnApplicationPreInputKeyDownListener().AddRaw(this,&FMatAbsorbModule::MKeyEvent);
}


void FMatAbsorbModule::MKeyEvent(const FKeyEvent& KeyEvent)
{
       FKey CurrentKey = KeyEvent.GetKey();
       if (CurrentKey == EKeys::M)
        {
            //加入要响应M键的操作
        }
}

获取鼠标选中的Actor

通过GEditor实现

USelection* SelectedActors = GEditor->GetSelectedActors();
TArray<AActor*> Actors;
for (FSelectionIterator Iter(*SelectedActors); Iter; ++Iter)
{
  AActor* Actor = Cast<AActor>(*Iter);
}