Make it easier to create look-at widgets

Config/DefaultEngine.ini

@@ -1,4 +1,5 @@
 
+
 [/Script/EngineSettings.GameMapsSettings]
 GameDefaultMap=/Game/LpxLevel.LpxLevel
 GlobalDefaultGameMode=/Game/Luprex/lxGameMode.lxGameMode_C
@@ -44,23 +45,23 @@ UIScaleCurve=(EditorCurveData=(Keys=((Time=480.000000,Value=0.444000),(Time=720.
 -Profiles=(Name="UI",CollisionEnabled=QueryOnly,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility",Response=ECR_Block),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldStatic object that overlaps all actors by default. All new custom channels will use its own default response. ",bCanModify=False)
 +Profiles=(Name="NoCollision",CollisionEnabled=NoCollision,bCanModify=False,ObjectTypeName="WorldStatic",CustomResponses=((Channel="Visibility",Response=ECR_Ignore),(Channel="Camera",Response=ECR_Ignore)),HelpMessage="No collision")
 +Profiles=(Name="BlockAll",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="WorldStatic",CustomResponses=,HelpMessage="WorldStatic object that blocks all actors by default. All new custom channels will use its own default response. ")
-+Profiles=(Name="OverlapAll",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldStatic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility",Response=ECR_Overlap),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldStatic object that overlaps all actors by default. All new custom channels will use its own default response. ")
++Profiles=(Name="OverlapAll",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldStatic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldStatic object that overlaps all actors by default. All new custom channels will use its own default response. ")
 +Profiles=(Name="BlockAllDynamic",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=,HelpMessage="WorldDynamic object that blocks all actors by default. All new custom channels will use its own default response. ")
-+Profiles=(Name="OverlapAllDynamic",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility",Response=ECR_Overlap),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldDynamic object that overlaps all actors by default. All new custom channels will use its own default response. ")
++Profiles=(Name="OverlapAllDynamic",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldDynamic object that overlaps all actors by default. All new custom channels will use its own default response. ")
 +Profiles=(Name="IgnoreOnlyPawn",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="Pawn",Response=ECR_Ignore),(Channel="Vehicle",Response=ECR_Ignore)),HelpMessage="WorldDynamic object that ignores Pawn and Vehicle. All other channels will be set to default.")
-+Profiles=(Name="OverlapOnlyPawn",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="Pawn",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Ignore)),HelpMessage="WorldDynamic object that overlaps Pawn, Camera, and Vehicle. All other channels will be set to default. ")
++Profiles=(Name="OverlapOnlyPawn",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="Pawn",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Ignore),(Channel="Vehicle",Response=ECR_Overlap)),HelpMessage="WorldDynamic object that overlaps Pawn, Camera, and Vehicle. All other channels will be set to default. ")
 +Profiles=(Name="Pawn",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="Pawn",CustomResponses=((Channel="Visibility",Response=ECR_Ignore)),HelpMessage="Pawn object. Can be used for capsule of any playerable character or AI. ")
-+Profiles=(Name="Spectator",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="Pawn",CustomResponses=((Channel="WorldStatic"),(Channel="Pawn",Response=ECR_Ignore),(Channel="Visibility",Response=ECR_Ignore),(Channel="WorldDynamic",Response=ECR_Ignore),(Channel="Camera",Response=ECR_Ignore),(Channel="PhysicsBody",Response=ECR_Ignore),(Channel="Vehicle",Response=ECR_Ignore),(Channel="Destructible",Response=ECR_Ignore)),HelpMessage="Pawn object that ignores all other actors except WorldStatic.")
++Profiles=(Name="Spectator",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="Pawn",CustomResponses=((Channel="WorldDynamic",Response=ECR_Ignore),(Channel="Pawn",Response=ECR_Ignore),(Channel="Visibility",Response=ECR_Ignore),(Channel="Camera",Response=ECR_Ignore),(Channel="PhysicsBody",Response=ECR_Ignore),(Channel="Vehicle",Response=ECR_Ignore),(Channel="Destructible",Response=ECR_Ignore)),HelpMessage="Pawn object that ignores all other actors except WorldStatic.")
-+Profiles=(Name="CharacterMesh",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="Pawn",CustomResponses=((Channel="Pawn",Response=ECR_Ignore),(Channel="Vehicle",Response=ECR_Ignore),(Channel="Visibility",Response=ECR_Ignore)),HelpMessage="Pawn object that is used for Character Mesh. All other channels will be set to default.")
++Profiles=(Name="CharacterMesh",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="Pawn",CustomResponses=((Channel="Pawn",Response=ECR_Ignore),(Channel="Visibility",Response=ECR_Ignore),(Channel="Vehicle",Response=ECR_Ignore)),HelpMessage="Pawn object that is used for Character Mesh. All other channels will be set to default.")
 +Profiles=(Name="PhysicsActor",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="PhysicsBody",CustomResponses=,HelpMessage="Simulating actors")
 +Profiles=(Name="Destructible",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="Destructible",CustomResponses=,HelpMessage="Destructible actors")
 +Profiles=(Name="InvisibleWall",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="WorldStatic",CustomResponses=((Channel="Visibility",Response=ECR_Ignore)),HelpMessage="WorldStatic object that is invisible.")
 +Profiles=(Name="InvisibleWallDynamic",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="Visibility",Response=ECR_Ignore)),HelpMessage="WorldDynamic object that is invisible.")
-+Profiles=(Name="Trigger",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility",Response=ECR_Ignore),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldDynamic object that is used for trigger. All other channels will be set to default.")
++Profiles=(Name="Trigger",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility",Response=ECR_Ignore),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldDynamic object that is used for trigger. All other channels will be set to default.")
 +Profiles=(Name="Ragdoll",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="PhysicsBody",CustomResponses=((Channel="Pawn",Response=ECR_Ignore),(Channel="Visibility",Response=ECR_Ignore)),HelpMessage="Simulating Skeletal Mesh Component. All other channels will be set to default.")
 +Profiles=(Name="Vehicle",CollisionEnabled=QueryAndPhysics,bCanModify=False,ObjectTypeName="Vehicle",CustomResponses=,HelpMessage="Vehicle object that blocks Vehicle, WorldStatic, and WorldDynamic. All other channels will be set to default.")
-+Profiles=(Name="UI",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Visibility"),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldStatic object that overlaps all actors by default. All new custom channels will use its own default response. ")
++Profiles=(Name="UI",CollisionEnabled=QueryOnly,bCanModify=False,ObjectTypeName="WorldDynamic",CustomResponses=((Channel="WorldStatic",Response=ECR_Overlap),(Channel="WorldDynamic",Response=ECR_Overlap),(Channel="Pawn",Response=ECR_Overlap),(Channel="Camera",Response=ECR_Overlap),(Channel="PhysicsBody",Response=ECR_Overlap),(Channel="Vehicle",Response=ECR_Overlap),(Channel="Destructible",Response=ECR_Overlap)),HelpMessage="WorldStatic object that overlaps all actors by default. All new custom channels will use its own default response. ")
-+DefaultChannelResponses=(Channel=ECC_GameTraceChannel1,DefaultResponse=ECR_Block,bTraceType=True,bStaticObject=False,Name="Clickable")
++DefaultChannelResponses=(Channel=ECC_GameTraceChannel1,DefaultResponse=ECR_Block,bTraceType=True,bStaticObject=False,Name="LookAtDetection")
 -ProfileRedirects=(OldName="BlockingVolume",NewName="InvisibleWall")
 -ProfileRedirects=(OldName="InterpActor",NewName="IgnoreOnlyPawn")
 -ProfileRedirects=(OldName="StaticMeshComponent",NewName="BlockAllDynamic")
@@ -79,4 +80,5 @@ UIScaleCurve=(EditorCurveData=(Keys=((Time=480.000000,Value=0.444000),(Time=720.
 +CollisionChannelRedirects=(OldName="Dynamic",NewName="WorldDynamic")
 +CollisionChannelRedirects=(OldName="VehicleMovement",NewName="Vehicle")
 +CollisionChannelRedirects=(OldName="PawnMovement",NewName="Pawn")
++CollisionChannelRedirects=(OldName="Clickable",NewName="LookAtDetection")
 

Source/Integration/LuaCall.h

@@ -37,6 +37,12 @@ enum class ElxSuccessOrError : uint8 {
 	Error,
 };
 
+UENUM(BlueprintType)
+enum class ElxFoundOrNotFound : uint8 {
+	Found,
+	NotFound,
+};
+
 /////////////////////////////////////////////////////////////////
 //
 // This is a little parser that parses Lua function 'prototypes'.

Source/Integration/LuprexGameModeBase.cpp

@@ -8,6 +8,7 @@
 #include "TangibleManager.h"
 #include "LuaCall.h"
 #include "Blueprint/UserWidget.h"
+#include "Blueprint/WidgetBlueprintLibrary.h"
 #include "Kismet/GameplayStatics.h"
 
 #include "CommonTypes.h"
@@ -26,6 +27,7 @@ ALuprexGameModeBase::ALuprexGameModeBase()
 	AssetLookup = nullptr;
 	PlayerId = 0;
 	EngineSeconds = 0.0;
+	MustCallLookAtChanged = false;
 	//PrimaryActorTick.bCanEverTick = true; // Probably wrong
 	//PrimaryActorTick.bTickEvenWhenPaused = true; // Probably wrong
 	//PrimaryActorTick.TickGroup = TG_PrePhysics; // Probably wrong
@@ -98,8 +100,8 @@ void ALuprexGameModeBase::ResetToInitialState()
 	PlayerId = 0;
 
 	// Clear the look-at state;
-	PreviousLookAt.Init();
 	CurrentLookAt.Init();
+	MustCallLookAtChanged = false;
 	
 	// Reset the clocks.
 	EngineSeconds = 0.0;
@@ -347,12 +349,6 @@ ALuprexGameModeBase *ALuprexGameModeBase::FromContext(const UObject *context) {
 	return result;
 }
 
-bool ALuprexGameModeBase::IsLookAtChanged(const UObject *context) {
-	ALuprexGameModeBase *mode = FromContext(context);
-	return mode->CurrentLookAt.HitObjectHandle != mode->PreviousLookAt.HitObjectHandle;
-}
-
-
 void ALuprexGameModeBase::ClearLookAtWidget(const UObject *Context)
 {
 	ALuprexGameModeBase *mode = FromContext(Context);
@@ -370,44 +366,57 @@ void ALuprexGameModeBase::SetLookAtWidget(const UObject *Context, UlxLookAtWidge
 	{
 		ClearLookAtWidget(Context);
 	}
-	if (!Widget->IsInViewport())
+	Mode->LookAtWidget = Widget;
+}
+
+UlxLookAtWidget *ALuprexGameModeBase::CreateLookAtWidgetByName(UObject *Context, const FString &BlueprintName,
+	ElxFoundOrNotFound &Result, bool ErrorIfNotFound, bool AddToViewport, bool SetLookAtWidget)
+{
+	ALuprexGameModeBase *Mode = FromContext(Context);
+	Result = ElxFoundOrNotFound::NotFound;
+	auto Blueprint = UlxAssetLookup::GetLookAtWidgetByName(Context, BlueprintName, ErrorIfNotFound);
+	if (Blueprint == nullptr) return nullptr;
+    APlayerController *pc = Context->GetWorld()->GetFirstPlayerController();
+	UlxLookAtWidget *Widget = Cast<UlxLookAtWidget>(UWidgetBlueprintLibrary::Create(Context, Blueprint, pc));
+	check(Widget != nullptr);
+	if (AddToViewport)
 	{
 		Widget->AddToViewport(100);
 	}
-	Mode->LookAtWidget = Widget;
+	if (SetLookAtWidget)
+	{
+		Mode->SetLookAtWidget(Context, Widget);
+	}
+	Result = ElxFoundOrNotFound::Found;
+	return Widget;
 }
 
+
 void ALuprexGameModeBase::SetLookAt(const UObject *Context, const FHitResult &HitResult)
 {
 	ALuprexGameModeBase *Mode = FromContext(Context);
+	if (Mode->CurrentLookAt.HitObjectHandle != HitResult.HitObjectHandle)
+	{
+		Mode->MustCallLookAtChanged = true;
+	}
 	Mode->CurrentLookAt = HitResult;
 }
 
+
 FVector2D ALuprexGameModeBase::GetLookAtPixel(const UObject *Context)
 {
 	ALuprexGameModeBase *Mode = FromContext(Context);
     APlayerController *pc = Context->GetWorld()->GetFirstPlayerController();
     if (pc == nullptr) return FVector2D();
 	FVector2D ScreenPosition;
-	UGameplayStatics::ProjectWorldToScreen(pc, Mode->CurrentLookAt.Location, ScreenPosition, false);
+	if (!UGameplayStatics::ProjectWorldToScreen(pc, Mode->CurrentLookAt.Location, ScreenPosition, false))
-	return ScreenPosition;
+	{
-}
+		return FVector2D();
-
+	}
-FVector2D ALuprexGameModeBase::GetPreviousLookAtPixel(const UObject *Context)
-{
-	ALuprexGameModeBase *Mode = FromContext(Context);
-    APlayerController *pc = Context->GetWorld()->GetFirstPlayerController();
-    if (pc == nullptr) return FVector2D();
-	FVector2D ScreenPosition;
-	UGameplayStatics::ProjectWorldToScreen(pc, Mode->PreviousLookAt.Location, ScreenPosition, false);
 	return ScreenPosition;
 }
 
 void ALuprexGameModeBase::UpdateLookAt() {
-	// Rotate the variables.
-	PreviousLookAt = CurrentLookAt;
-	CurrentLookAt.Init();
-	
 	// Make sure the world is fully configured before we attempt to cast rays.
     UlxTangible *possessed = TangibleManager->GetPossessedTangible();
  	if (possessed == nullptr) return;
@@ -421,8 +430,8 @@ void ALuprexGameModeBase::UpdateLookAt() {
 
 	CalculateLookAt(pc);
 
-	if (IsLookAtChanged(this)) {
+	if (MustCallLookAtChanged) {
-		ClearLookAtWidget(this);
+		MustCallLookAtChanged = false;
 		LookAtChanged();
 	}
 }

Source/Integration/LuprexGameModeBase.h

@@ -31,7 +31,7 @@ class INTEGRATION_API UlxLookAtWidget : public UUserWidget
 
 public:
 	UFUNCTION(BlueprintImplementableEvent, BlueprintCallable, Category = "Luprex|Look-At Detection")
-	void ReadLuaConfiguration(AActor *Place, UlxLuaValues *Config);
+	void ReadLuaConfiguration(UlxLuaValues *Config);
 };
 
 /**
@@ -79,24 +79,33 @@ public:
 	UFUNCTION(BlueprintPure, meta = (WorldContext = "Context"),Category = "Luprex|Look-At Detection")
 	static FVector2D GetLookAtPixel(const UObject *Context);
 	
-	UFUNCTION(BlueprintPure, meta = (WorldContext = "Context"),Category = "Luprex|Look-At Detection")
-	static const FHitResult &GetPreviousLookAt(const UObject *Context) { return FromContext(Context)->PreviousLookAt; }
-
-	UFUNCTION(BlueprintPure, meta = (WorldContext = "Context"),Category = "Luprex|Look-At Detection")
-	static const AActor *GetPreviousLookAtActor(const UObject *Context) { return FromContext(Context)->PreviousLookAt.GetActor(); }
-
-	UFUNCTION(BlueprintPure, meta = (WorldContext = "Context"),Category = "Luprex|Look-At Detection")
-	static FVector2D GetPreviousLookAtPixel(const UObject *Context);
-	
-	UFUNCTION(BlueprintPure, meta = (WorldContext = "Context"),Category = "Luprex|Look-At Detection")
-	static bool IsLookAtChanged(const UObject *Context);
-	
 	UFUNCTION(BlueprintCallable, meta = (WorldContext = "Context"), Category = "Luprex|Look-At Detection")
 	static void SetLookAtWidget(const UObject *Context, UlxLookAtWidget *Widget);
 
 	UFUNCTION(BlueprintCallable, meta = (WorldContext = "Context"), Category = "Luprex|Look-At Detection")
 	static UlxLookAtWidget *GetLookAtWidget(const UObject *Context) { return FromContext(Context)->LookAtWidget; }
 
+	// Create a new Look-At Widget, given the blueprint's name.
+	//
+	// The prefix WB_ is added to the blueprint name, and the blueprint is
+	// searched for in the folder "Widgets".
+	//
+	// * If the specified blueprint is not found, execution continues
+	//   on the "Not Found" pin.
+	//
+	// * If the flag "Error if Not Found" is true, and the widget blueprint
+	//   is not found, logs an error.
+	//
+	// * If the flag "Add to Viewport" is true, the new widget is added
+	//   to the viewport.
+	//
+	// * If the flag "Set Look at Widget" is true, the new widget is stored
+	//   as the current look-at widget.
+	//
+	UFUNCTION(BlueprintCallable, meta = (ExpandEnumAsExecs = "Result", WorldContext = "Context"), Category = "Luprex|Look-At Detection")
+	static UlxLookAtWidget *CreateLookAtWidgetByName(UObject *Context, const FString &BlueprintName,
+		ElxFoundOrNotFound &Result, bool ErrorIfNotFound = true, bool AddToViewport = true, bool SetLookAtWidget = true);
+		
 	UFUNCTION(BlueprintCallable, meta = (WorldContext = "Context"), Category = "Luprex|Look-At Detection")
 	static void ClearLookAtWidget(const UObject *Context);
 
@@ -168,14 +177,12 @@ public:
 	UPROPERTY()
 	UlxTangibleManager *TangibleManager;
 
-	// The actor that the player was looking at, previous frame.
-	UPROPERTY()
-	FHitResult PreviousLookAt;
-
 	// The actor that the player is looking at, current frame.
 	UPROPERTY()
 	FHitResult CurrentLookAt;
 
+	bool MustCallLookAtChanged;
+
 	UPROPERTY()
 	UlxLookAtWidget *LookAtWidget;