Add Shop menu on each hand

UI/shop_ui.gd

@@ -1,12 +1,63 @@
+class_name ShopUI
 extends Panel
 
 @onready var money_label: Label = $Money
 
-# Called when the node enters the scene tree for the first time.
+var controller: XRController3D = null
+const INPUT_TOGGLE_COOLDOWN := 0.15
+
+var enabled: bool = false: set = _set_enabled
+
+var _last_toggle_time := 0.0
+var viewport: XRToolsViewport2DIn3D
+
 func _ready() -> void:
-	pass # Replace with function body.
-
-
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-func _process(delta: float) -> void:
+	detect_hand_from_xr_ancestor()
+	if controller:
+		controller.button_pressed.connect(_on_tracker_button_pressed)
+	viewport = get_parent().get_parent() as XRToolsViewport2DIn3D
+	if not viewport:
+		push_error("Shop UI could not find XRToolsViewport2DIn3D grand parent")
+	enabled = false
+	
+	
+func _process(_delta: float) -> void:
 	money_label.text = str(GameManager.money) + "$"
+
+
+func toggle_shop():
+	if GameManager.game_state == GameManager.GameState.BUILDING:
+		print("Shop UI toggle shop")
+		enabled = !enabled
+
+
+func _set_enabled(value: bool) -> void:
+		enabled = value
+		visible = value
+		viewport.enabled = value
+
+
+func _on_tracker_button_pressed(button_name: String) -> void:
+	print("Shop _on_tracker_button_pressed, button: ", button_name)
+	var now := Time.get_ticks_msec() / 1000.0
+	if now - _last_toggle_time < INPUT_TOGGLE_COOLDOWN:
+		return
+	
+	_last_toggle_time = now
+	if button_name == "ax_button":
+		toggle_shop()
+
+
+func detect_hand_from_xr_ancestor() -> void:
+	var curr: Node = get_parent()
+	# Climb up the tree until we find an XRNode3D/XRController3D or hit root
+	while curr != null:
+		if curr is XRController3D:
+			controller = curr
+			break
+		curr = curr.get_parent()
+	
+	if not controller:
+		push_error("Shop UI could not find XRController3D ancestor")
+	else:
+		print ("Shop UI detected hand: ", controller.get_tracker_hand())