diff options
Diffstat (limited to 'demos/misc/autoload/global.gd')
| -rw-r--r-- | demos/misc/autoload/global.gd | 45 |
1 files changed, 29 insertions, 16 deletions
diff --git a/demos/misc/autoload/global.gd b/demos/misc/autoload/global.gd index a0415c6ee0..735995e806 100644 --- a/demos/misc/autoload/global.gd +++ b/demos/misc/autoload/global.gd @@ -1,23 +1,36 @@ extends Node -var current_scene = null +# Changing scenes is most easily done using the functions `change_scene` +# and `change_scene_to` of the SceneTree. This script demonstrates how to +# change scenes without those helpers. -func goto_scene(scene): - #load new scene - var s = ResourceLoader.load(scene) - #queue erasing old (don't use free because that scene is calling this method) - current_scene.queue_free() - #instance the new scene - current_scene = s.instance() - #add it to the active scene, as child of root - get_tree().get_root().add_child(current_scene) +func goto_scene(path): + # This function will usually be called from a signal callback, + # or some other function from the running scene. + # Deleting the current scene at this point might be + # a bad idea, because it may be inside of a callback or function of it. + # The worst case will be a crash or unexpected behavior. + + # The way around this is deferring the load to a later time, when + # it is ensured that no code from the current scene is running: + + call_deferred("_deferred_goto_scene",path) -func _ready(): - # get the current scene - # it is always the last child of root, - # after the autoloaded nodes - var root = get_tree().get_root() - current_scene = root.get_child( root.get_child_count() -1 ) +func _deferred_goto_scene(path): + # Immediately free the current scene, there is no risk here. + get_tree().get_current_scene().free() + + # Load new scene + var packed_scene = ResourceLoader.load(path) + + # Instance the new scene + var instanced_scene = packed_scene.instance() + + # Add it to the scene tree, as direct child of root + get_tree().get_root().add_child(instanced_scene) + + # Set it as the current scene, only after it has been added to the tree + get_tree().set_current_scene(instanced_scene) |