34. Listening for Attribute Changes

Project/Source/Gasa/AbilitySystem/GasaAttributeSet.cpp

@@ -8,9 +8,9 @@
 
 UGasaAttributeSet::UGasaAttributeSet()
 {
-	InitHealth( 80.f );
+	InitHealth( 50.f );
 	InitMaxHealth( 100.f );
-	InitMana( 20.f );
+	InitMana( 25.f );
 	InitMaxMana( 50.f );
 }
 

Project/Source/Gasa/GasaCommon.h

@@ -14,6 +14,7 @@
 
 #pragma region Engine Forwards
 struct FInputActionValue;
+struct FOnAttributeChangeData;
 
 class IAbilitySystemInterface;
 
@@ -34,6 +35,8 @@ class UCogWindowManager;
 // Gasa
 
 #pragma region Forwards
+struct FWidgetControllerData;
+
 class ACameraMount;
 class AGasaCharacter;
 class AGasaGameInstance;
@@ -52,8 +55,6 @@ class UGasaSizeBox;
 class UHostWidgetController;
 class UHUDHostWidget;
 class UWidgetController;
-
-struct FWidgetControllerData;
 #pragma endregion Forwards
 
 #pragma region Logging

Project/Source/Gasa/GasaDevOptionsCache.cpp

@@ -12,13 +12,18 @@ void FGasaDevOptionsCache::CachedDevOptions()
 	UGasaDevOptions* DevOpts = GetMutDevOptions();
 
 	Template_PlayerCamera = DevOpts->Template_PlayerCamera.LoadSynchronous();
-	ensureMsgf( Template_PlayerCamera != nullptr, TEXT( "Template_PlayerCamera is null, DO NOT RUN PIE or else you may get a crash if not handled in BP or C++" ) );
+	ensureMsgf(
+	    Template_PlayerCamera != nullptr, TEXT( "Template_PlayerCamera is null, DO NOT RUN PIE or else you may get a crash if not handled in BP or C++" )
+	);
 
 	Template_HUD_HostUI = DevOpts->Template_HUD_HostUI.LoadSynchronous();
 	ensureMsgf( Template_HUD_HostUI != nullptr, TEXT( "Template_HUD_HostUI is null, DO NOT RUN PIE or else you may get a crash if not handled in BP or C++" ) );
 
 	Template_HostWidgetController = DevOpts->Template_HostWidgetController.LoadSynchronous();
-	ensureMsgf( Template_HostWidgetController != nullptr, TEXT( "Template_HostWidgetController is null, DO NOT RUN PIE or else you may get a crash if not handled in BP or C++" ) );
+	ensureMsgf(
+	    Template_HostWidgetController != nullptr,
+	    TEXT( "Template_HostWidgetController is null, DO NOT RUN PIE or else you may get a crash if not handled in BP or C++" )
+	);
 
 	Tag_GlobalPPV = DevOpts->Tag_GlobalPPV;
 }

Project/Source/Gasa/UI/GasaHUD.cpp

@@ -14,6 +14,7 @@ void AGasaHUD::InitHostWidget(FWidgetControllerData const* WidgetControllerData)
 	HostWidgetController = NewObject<UHostWidgetController>(this, GetDevOptions()->Template_HostWidgetController.Get());
 	HostWidgetController->Data = (* WidgetControllerData);
 	HostWidget->SetWidgetController(HostWidgetController);
+	HostWidgetController->BindCallbacksToDependencies();
 	
 	HostWidgetController->BroadcastInitialValues();
 	HostWidget->AddToViewport();

Project/Source/Gasa/UI/HostWIdgetController.cpp

@@ -1,8 +1,34 @@
 #include "HostWidgetController.h"
+#include "AbilitySystem/GasaAbilitySystemComponent_Inlines.h"
 #include "AbilitySystem/GasaAttributeSet.h"
+#include "GameplayEffectTypes.h"
+
+#pragma region Attribute Changed Callbacks
+// Attribute Changed Callbacks are generated by GasaGen/GasaGen_HostWidgetController.cpp
+
+void UHostWidgetController::HealthChanged( FOnAttributeChangeData const& Attribute )
+{
+	Event_OnHealthChanged.Broadcast( Attribute.NewValue );
+}
+
+void UHostWidgetController::MaxHealthChanged( FOnAttributeChangeData const& Attribute )
+{
+	Event_OnMaxHealthChanged.Broadcast( Attribute.NewValue );
+}
+
+void UHostWidgetController::ManaChanged( FOnAttributeChangeData const& Attribute )
+{
+	Event_OnManaChanged.Broadcast( Attribute.NewValue );
+}
+
+void UHostWidgetController::MaxManaChanged( FOnAttributeChangeData const& Attribute )
+{
+	Event_OnMaxManaChanged.Broadcast( Attribute.NewValue );
+}
+#pragma endregion Attribute Changed Callbacks
+
 void UHostWidgetController::BroadcastInitialValues()
 {
-	Super::BroadcastInitialValues();
 	UGasaAttributeSet* GasaAttribs = Cast<UGasaAttributeSet>( Data.Attributes );
 	if ( GasaAttribs )
 	{
@@ -12,3 +38,24 @@ void UHostWidgetController::BroadcastInitialValues()
 		Event_OnMaxManaChanged.Broadcast( GasaAttribs->GetMaxMana() );
 	}
 }
+
+void UHostWidgetController::BindCallbacksToDependencies()
+{
+	UGasaAbilitySystemComp* AbilitySystem = Cast<UGasaAbilitySystemComp>( Data.AbilitySystem );
+	UGasaAttributeSet*      GasaAttribs   = Cast<UGasaAttributeSet>( Data.Attributes );
+
+	FOnGameplayAttributeValueChange& HealthAttributeChangedDelegate =
+	    AbilitySystem->GetGameplayAttributeValueChangeDelegate( GasaAttribs->GetHealthAttribute() );
+	HealthAttributeChangedDelegate.AddUObject( this, &ThisClass::HealthChanged );
+
+	FOnGameplayAttributeValueChange& MaxHealthAttributeChangedDelegate =
+	    AbilitySystem->GetGameplayAttributeValueChangeDelegate( GasaAttribs->GetMaxHealthAttribute() );
+	MaxHealthAttributeChangedDelegate.AddUObject( this, &ThisClass::MaxHealthChanged );
+
+	FOnGameplayAttributeValueChange& ManaAttributeChangedDelegate = AbilitySystem->GetGameplayAttributeValueChangeDelegate( GasaAttribs->GetManaAttribute() );
+	ManaAttributeChangedDelegate.AddUObject( this, &ThisClass::ManaChanged );
+
+	FOnGameplayAttributeValueChange& MaxManaAttributeChangedDelegate =
+	    AbilitySystem->GetGameplayAttributeValueChangeDelegate( GasaAttribs->GetMaxManaAttribute() );
+	MaxManaAttributeChangedDelegate.AddUObject( this, &ThisClass::MaxManaChanged );
+}

Project/Source/Gasa/UI/HostWidgetController.h

@@ -23,9 +23,15 @@ public:
 
 	UPROPERTY( BlueprintAssignable, Category = "Attributes" )
 	FAttributeFloatChangedSig Event_OnMaxManaChanged;
+
+	void HealthChanged( FOnAttributeChangeData const& Data );
+	void MaxHealthChanged( FOnAttributeChangeData const& Data );
+	void ManaChanged( FOnAttributeChangeData const& Data );
+	void MaxManaChanged( FOnAttributeChangeData const& Data );
 #pragma endregion Attribute Events
 
 #pragma region WidgetController
 	void BroadcastInitialValues() override;
+	void BindCallbacksToDependencies() override;
 #pragma endregion WidgetController
 };

Project/Source/Gasa/UI/WidgetController.h

@@ -45,4 +45,5 @@ public:
 
 	UFUNCTION()
 	virtual void BroadcastInitialValues() {};
+	virtual void BindCallbacksToDependencies() {};
 };