load scene by state

godot/global.gd

@@ -22,7 +22,6 @@ func _ready():
 	if err == OK:
 		var db_path = config.get_value("general", "db_path")
 		load_db(db_path)
-		
 
 func switch_state(new: State):
 	var old = current_state
@@ -30,6 +29,7 @@ func switch_state(new: State):
 		return
 
 	current_state = new
+	emit_signal("state_changed", old, new)
 	#signal state_changed(old, new)
 
 func load_db(path: String):
@@ -38,8 +38,10 @@ func load_db(path: String):
 	if success:
 		config.set_value("general", "db_path", path)
 		config.save(config_path)
+		switch_state(State.LOADED)
 	else:
 		db.path = ""
+		switch_state(State.UNLOADED)
 
 func goto_scene(path):
 	call_deferred("_deferred_goto_scene", path)

godot/loaded.tscn

@@ -0,0 +1,7 @@
+[gd_scene format=3 uid="uid://h1sdn3cjclqi"]
+
+[node name="CenterContainer" type="CenterContainer"]
+
+[node name="Label" type="Label" parent="."]
+layout_mode = 2
+text = "Loaded !"

godot/main.gd

@@ -5,6 +5,16 @@ func _ready():
 	$FileDialog.mode = FileDialog.FILE_MODE_OPEN_FILE
 	$FileDialog.access = FileDialog.ACCESS_FILESYSTEM
 	$FileDialog.use_native_dialog = true
+	
+	Global.state_changed.connect(_update_state)
+	if Global.current_state == Global.State.UNLOADED:
+		pass
+	elif Global.current_state == Global.State.LOADED:
+		$MarginContainer.remove_child($MarginContainer/Unloaded)
+		var s = ResourceLoader.load("res://loaded.tscn")
+		var current_scene = s.instantiate()
+		$MarginContainer.add_child(current_scene)
+		pass
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta):
@@ -16,3 +26,7 @@ func _on_button_pressed():
 
 func _on_file_dialog_file_selected(path):
 	Global.load_db(path)
+
+func _update_state(old: Global.State, new: Global.State):
+	print("updated state")
+	pass

godot/main.tscn

@@ -1,6 +1,7 @@
-[gd_scene load_steps=2 format=3 uid="uid://y5v0kmse8n10"]
+[gd_scene load_steps=3 format=3 uid="uid://y5v0kmse8n10"]
 
 [ext_resource type="Script" path="res://main.gd" id="1_2tuu3"]
+[ext_resource type="PackedScene" uid="uid://b71wpb1vts86r" path="res://unloaded.tscn" id="2_diny5"]
 
 [node name="Control" type="Control"]
 layout_mode = 3
@@ -24,15 +25,9 @@ grow_horizontal = 2
 grow_vertical = 2
 metadata/_edit_use_anchors_ = true
 
-[node name="CenterContainer" type="CenterContainer" parent="MarginContainer"]
+[node name="Unloaded" parent="MarginContainer" instance=ExtResource("2_diny5")]
 layout_mode = 2
 
-[node name="Button" type="Button" parent="MarginContainer/CenterContainer"]
-custom_minimum_size = Vector2(200, 200)
-layout_mode = 2
-text = "Load database"
-
 [node name="FileDialog" type="FileDialog" parent="."]
 
-[connection signal="pressed" from="MarginContainer/CenterContainer/Button" to="." method="_on_button_pressed"]
 [connection signal="file_selected" from="FileDialog" to="." method="_on_file_dialog_file_selected"]

godot/unloaded.tscn

@@ -0,0 +1,8 @@
+[gd_scene format=3 uid="uid://b71wpb1vts86r"]
+
+[node name="CenterContainer" type="CenterContainer"]
+
+[node name="Button" type="Button" parent="."]
+custom_minimum_size = Vector2(200, 200)
+layout_mode = 2
+text = "Load database"