Fixed unresponsive loaded scenes, when using UI

The Button for switching to a different scene now unpauses the tree
and frees the previous scene from memory

src/UserInterface/Buttons/PlayButton.gd

@@ -1,4 +1,3 @@
-tool
 extends Button
 
 export(String, FILE) var next_scene_path: = ""
@@ -6,9 +5,11 @@ onready var selected_level_base_path: String = "res://src/Levels/"
 
 func _on_button_up() -> void:
 	get_tree().change_scene(next_scene_path)
+	get_tree().get_current_scene().queue_free()
+	get_tree().paused = false
 
 func _get_configuration_warning() -> String:
 	return "next_scene_path must be set for the button to work" if next_scene_path == "" else ""
 
 func _level_selection_changed(button):
-	next_scene_path = selected_level_base_path + button.text + ".tscn"
+	next_scene_path = selected_level_base_path + button.text + ".tscn"

src/UserInterface/Buttons/UserInterface.gd

@@ -1,7 +1,7 @@
 extends Control
 
 # Smart ist es die notwendigen Resourcen vor dem Skriptstart zu laden
-onready var scene_tree := get_tree()
+onready var current_scene := get_tree().get_current_scene()
 onready var pause_overlay: ColorRect = get_node("PauseOverlay")
 onready var score: Label = get_node("Label")
 onready var pause_title: Label = get_node("PauseOverlay/Title")
@@ -26,7 +26,7 @@ func _unhandled_input(event: InputEvent) -> void:
 		#not oder ! schaltet einen boolean um
 		#Ist self hier notwendig?
 		self.paused = not paused
-		scene_tree.set_input_as_handled()
+		get_tree().set_input_as_handled()
 
 
 func update_interface() -> void:
@@ -35,5 +35,5 @@ func update_interface() -> void:
 
 func set_paused(value: bool) -> void:
 	paused = value
-	scene_tree.paused = value
+	get_tree().paused = value
 	pause_overlay.visible = value

src/UserInterface/Buttons/UserInterface.tscn

@@ -10,6 +10,7 @@
 pause_mode = 2
 anchor_right = 1.0
 anchor_bottom = 1.0
+mouse_filter = 2
 theme = ExtResource( 1 )
 script = ExtResource( 5 )
 
@@ -47,7 +48,7 @@ margin_bottom = 80.0
 [node name="MainMenuButton" parent="PauseOverlay/VBoxContainer" instance=ExtResource( 3 )]
 margin_top = 84.0
 margin_right = 222.0
-margin_bottom = 164.0
+margin_bottom = 165.0
 text = "Main Menu"
 next_scene_path = "res://src/UserInterface/Screens/MainScreen.tscn"
 
@@ -55,29 +56,25 @@ next_scene_path = "res://src/UserInterface/Screens/MainScreen.tscn"
 anchor_left = 0.0
 anchor_right = 0.0
 margin_left = 0.0
-margin_top = 168.0
+margin_top = 169.0
 margin_right = 222.0
 margin_bottom = 250.0
 
 [node name="PauseLabel" type="Label" parent="PauseOverlay"]
 anchor_left = 0.5
-anchor_top = 0.5
 anchor_right = 0.5
-anchor_bottom = 0.5
-margin_left = -59.0
-margin_top = -187.5
-margin_right = 59.0
-margin_bottom = -142.5
+margin_left = -19.0
+margin_right = 19.0
+margin_bottom = 15.0
+size_flags_horizontal = 0
+size_flags_vertical = 0
 text = "Pause"
-__meta__ = {
-"_edit_use_anchors_": false
-}
 
 [node name="Label" type="Label" parent="."]
 anchor_left = 1.0
 anchor_right = 1.0
-margin_left = -84.0
-margin_right = -5.0
+margin_left = -96.0001
+margin_right = -17.0001
 margin_bottom = 24.0
 rect_scale = Vector2( 0.590909, 0.627907 )
 text = "Score: %s"

src/UserInterface/Screens/LevelList.gd

@@ -2,17 +2,11 @@ extends ScrollContainer
 
 onready var LEVELS_PATH = "res://src/Levels/"
 onready var BUTTON_GROUP : ButtonGroup = load("res://src/UserInterface/Screens/LevelSelectButtonGroup.tres")
-onready var vbox = $VBoxContainer
+onready var vbox: VBoxContainer = $VBoxContainer
 
-# Declare member variables here. Examples:
-# var a: int = 2
-# var b: String = "text"
-
-
-# Called when the node enters the scene tree for the first time.
 func _ready() -> void:
+	BUTTON_GROUP.connect("pressed", get_node('../Buttons/PlayButton'), "_level_selection_changed")
 	_fill_level_list()
-	pass # Replace with function body.
 
 func _fill_level_list():
 	var levels = []
@@ -30,17 +24,9 @@ func _fill_level_list():
 		_spawn_level_options(levels)
 
 func _spawn_level_options(levels: Array):
-	BUTTON_GROUP.connect("pressed", get_node('../Buttons/PlayButton'), "_level_selection_changed")
 	for level in levels:
 		var check_box = CheckBox.new()
 		check_box.text = level.trim_suffix(".tscn")
 		check_box.set_button_group(BUTTON_GROUP);
 		vbox.add_child(check_box)
-	return
-		
-
-		
-
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-#func _process(delta: float) -> void:
-#	pass
+	return

src/UserInterface/Screens/MainScreen.tscn

@@ -11,6 +11,7 @@
 [node name="MainScreen" type="Control"]
 anchor_right = 1.0
 anchor_bottom = 1.0
+mouse_filter = 2
 size_flags_horizontal = 0
 size_flags_vertical = 0
 theme = ExtResource( 5 )