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Use a Hotbar Slot

Activate whatever item is in a given slot: Blueprint: 
[HotbarComponent] → UseHotbarSlot
   Slot Index: 0
   Return: Success (true/false)
C++: 
bool bUsed = HotbarComponent->UseHotbarSlot(0);
Typical behavior when using a slot:
  • Gets the item assigned to that slot
  • Checks if the item is usable (weapon, consumable, tool, etc.)
  • Triggers the item’s use/action logic
  • Reduces quantity for consumables (if auto-consume is enabled)
  • Triggers auto-refill if the slot becomes empty

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Input Binding

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Enhanced Input

Create an Input Action per hotbar slot (or use a single action with a key value):
  • IA_Hotbar1
  • IA_Hotbar2
  • …
  • IA_Hotbar9
In your character Blueprint: 
IA_Hotbar1 (Triggered)
   ↓
[HotbarComponent] → UseHotbarSlot
   Slot Index: 0
Repeat for all slots you want to support.

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Legacy Input

void AMyCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    PlayerInputComponent->BindAction("Hotbar1", IE_Pressed, this, &AMyCharacter::UseHotbarSlot1);
    PlayerInputComponent->BindAction("Hotbar2", IE_Pressed, this, &AMyCharacter::UseHotbarSlot2);
    // ...
}

void AMyCharacter::UseHotbarSlot1()
{
    HotbarComponent->UseHotbarSlot(0);
}