switching items with controller

Items/Inventory.cs

@@ -27,6 +27,20 @@ public partial class Inventory : Node2D
         set => EquipItem(value, ref _selectedItem);
     }
 
+    private int _quickSwitchIndex = -1;
+
+    public const int QUICKSWITCH_SIZE = 3;
+
+    public int CurrentQuickSwitchIndex
+    {
+        get => _quickSwitchIndex;
+        set
+        {
+            const int size = QUICKSWITCH_SIZE;
+            _quickSwitchIndex = (value % size + size) % size;
+        }
+    }
+
     public bool IsUsingItem => SelectedItem?.IsUsing ?? false;
 
     public Inventory()
@@ -57,6 +71,16 @@ public partial class Inventory : Node2D
         base._Ready();
     }
 
+    public bool EquipIndex(int index)
+    {
+        if (index < Items.Count)
+        {
+            return EquipItem(Items[index], ref _selectedItem);
+        }
+
+        return EquipItem(null, ref _selectedItem);
+    }
+
     private bool EquipItem(Item item, ref Item slot)
     {
         if (item is not null)

State/Character/PlayerState.cs

@@ -30,6 +30,14 @@ public abstract partial class PlayerState : CharacterState
             {
                 inventory.SelectedItem = inventory.GetItemByMap("equip_3");
             }
+            else if (@event.IsActionPressed("next_item"))
+            {
+                inventory.EquipIndex(++inventory.CurrentQuickSwitchIndex);
+            }
+            else if (@event.IsActionPressed("prev_item"))
+            {
+                inventory.EquipIndex(--inventory.CurrentQuickSwitchIndex);
+            }
 
             if (@event.IsActionPressed("interact"))
             {

project.godot

@@ -172,6 +172,16 @@ look_right={
 "events": [Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":-1,"axis":3,"axis_value":1.0,"script":null)
 ]
 }
+next_item={
+"deadzone": 0.5,
+"events": [Object(InputEventJoypadButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":5,"pressure":0.0,"pressed":false,"script":null)
+]
+}
+prev_item={
+"deadzone": 0.5,
+"events": [Object(InputEventJoypadButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":4,"pressure":0.0,"pressed":false,"script":null)
+]
+}
 
 [internationalization]