HotBarSlotUI

Individual hotbar slot UI element. Displays an item icon and toggles between normal/active background sprites to indicate the currently selected slot.

Definition

Namespace: Paragon.Townskeep.HUD Assembly: Townskeep.dll

public class HotBarSlotUI : ParagonUIBehaviour

Inheritance: SerializedMonoBehaviour → ParagonBehaviour → ParagonUIBehaviour → HotBarSlotUI

Remarks

HotBarSlotUI represents a single slot in the hotbar. It manages two visual concerns:

1. Selection state — Swaps the background Image sprite between Normal and Active to indicate whether this slot is currently selected.

2. Item display — Shows or hides an item icon Image and sets it to the item's Icon sprite.

The component expects a specific child hierarchy (found via transform.Find in Awake()):

• A child named "Background" with an Image component

• A child named "Item" with an Image component

HotBarSlotUI is driven by HotBarHUD, which discovers all slot children via GetComponentsInChildren<HotBarSlotUI>() and calls the appropriate methods when inventory or selection state changes.

Quick Lookup

Goal	How
Show an item in the slot	slot.SetItem(item)
Clear the slot	slot.Clear()
Highlight as selected	slot.OnActivated()
Remove selection highlight	slot.OnDeactivated()

Fields

Normal

Background sprite for the unselected state.

public Sprite Normal;

Active

Background sprite for the selected state.

public Sprite Active;

Methods

Awake

Resolves the Background and Item child Image components via transform.Find().

void Awake()

OnActivated

Sets the background sprite to Active, indicating this slot is the current selection.

public void OnActivated()

OnDeactivated

Sets the background sprite to Normal, indicating this slot is no longer selected.

public void OnDeactivated()

SetItem

Displays an item in the slot by activating the icon GameObject and setting the sprite to the item's Icon.

public void SetItem(Item item, int amount = 1)

Parameter	Type	Description
item	Item	The item to display
amount	int	Item amount (currently unused visually, default: 1)

The amount parameter is accepted but not currently rendered. The slot displays the item icon only, without a quantity label.

Clear

Hides the item icon by deactivating the icon GameObject and resetting its sprite to the background sprite.

public void Clear()

Common Pitfalls

Child hierarchy must match expected names Awake() uses transform.Find("Background") and transform.Find("Item") to resolve Image components. If these children are missing or named differently, NullReferenceException will occur.

Normal and Active sprites must be assigned The Normal and Active sprite fields are public but not validated. If unassigned, OnActivated() / OnDeactivated() will set the background sprite to null, causing a blank image.

See Also

• HotBarHUD — parent element that manages all slots

• HUDElement — base class for HUD panels

• Item — the item type displayed in slots