Switching to build tool does not immediately activate build system.

data/items/floor.tres

@@ -12,3 +12,4 @@ icon = ExtResource("1_fe6dh")
 max_stack_size = 64
 is_tool = false
 is_buildable = true
+tool_action = 0

game_ui.gd

@@ -69,7 +69,7 @@ func _process(_delta):
 		build_dialog.hide()
 
 	if _game_scene != null:
-		if _player.has_build_tool_active():
+		if _player.has_build_tool_active() and _game_scene.build_system.build_item != null:
 			_game_scene.build_system.is_active = true
 		else:
 			_game_scene.build_system.is_active = false
@@ -157,7 +157,11 @@ func _on_tool_select(item_slot:ItemSlot) -> void:
 
 func _on_build_items_container_item_selected(item_slot:ItemSlot) -> void:
 	if _game_scene:
+		if item_slot != null:
 			_game_scene.build_system.build_item = item_slot.get_item()
+		else:
+			_game_scene.build_system.build_item = null
+			
 		build_dialog.hide()
 
 

scenes/game.gd

@@ -14,7 +14,7 @@ func _ready():
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(_delta):
-	if build_system.is_active and build_system.build_item != null:
+	if build_system.is_active:
 		player.process_mode = Node.PROCESS_MODE_DISABLED
 	else:
 		player.process_mode = Node.PROCESS_MODE_ALWAYS

scenes/game.tscn

@@ -1,11 +1,10 @@
-[gd_scene load_steps=10 format=3 uid="uid://cqie4cy0uy1t0"]
+[gd_scene load_steps=9 format=3 uid="uid://cqie4cy0uy1t0"]
 
 [ext_resource type="Script" path="res://scenes/game.gd" id="1_kl6si"]
 [ext_resource type="PackedScene" uid="uid://ch0s3dxx3rpir" path="res://objects/player.tscn" id="2_rjgxk"]
 [ext_resource type="Script" path="res://systems/QuestSystem.gd" id="4_8oxap"]
 [ext_resource type="Script" path="res://systems/BuildSystem.gd" id="4_iqdys"]
 [ext_resource type="PackedScene" uid="uid://dmagdl5pi6jdj" path="res://world/level.tscn" id="6_svjo8"]
-[ext_resource type="Resource" uid="uid://cepy03xrewibs" path="res://data/items/floor.tres" id="6_xdkny"]
 
 [sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_y65pc"]
 
@@ -43,7 +42,6 @@ script = ExtResource("4_8oxap")
 [node name="BuildSystem" type="Node" parent="."]
 unique_name_in_owner = true
 script = ExtResource("4_iqdys")
-build_item = ExtResource("6_xdkny")
 
 [node name="BuildPreview" type="Node3D" parent="BuildSystem"]
 unique_name_in_owner = true

ui/item_grid.gd

@@ -75,6 +75,7 @@ func _on_slot_mouse_entered(slot:ItemSlot):
 
 func select_slot(index:int) -> void:
 	if index < 0 or index > _slots.size():
+		item_selected.emit(null)
 		return
 	
 	_selected_slot_index = index