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EditorUndoRedoManager

Inherits: Object

Manages undo history of scenes opened in the editor.

Description

EditorUndoRedoManager is a manager for UndoRedo objects associated with edited scenes. Each scene has its own undo history and EditorUndoRedoManager ensures that each action performed in the editor gets associated with a proper scene. For actions not related to scenes (ProjectSettings edits, external resources, etc.), a separate global history is used.

The usage is mostly the same as UndoRedo. You create and commit actions and the manager automatically decides under-the-hood what scenes it belongs to. The scene is deduced based on the first operation in an action, using the object from the operation. The rules are as follows:

If the object is a Node, use the currently edited scene;
If the object is a built-in resource, use the scene from its path;
If the object is external resource or anything else, use global history.

This guessing can sometimes yield false results, so you can provide a custom context object when creating an action.

EditorUndoRedoManager is intended to be used by Redot editor plugins. You can obtain it using EditorPlugin.get_undo_redo. For non-editor uses or plugins that don't need to integrate with the editor's undo history, use UndoRedo instead.

The manager's API is mostly the same as in UndoRedo, so you can refer to its documentation for more examples. The main difference is that EditorUndoRedoManager uses object + method name for actions, instead of Callable.

Methods

void	add_do_method(object: Object, method: StringName, ...) vararg
void	add_do_property(object: Object, property: StringName, value: Variant)
void	add_do_reference(object: Object)
void	add_undo_method(object: Object, method: StringName, ...) vararg
void	add_undo_property(object: Object, property: StringName, value: Variant)
void	add_undo_reference(object: Object)
void	clear_history(id: int = -99, increase_version: bool = true)
void	commit_action(execute: bool = true)
void	create_action(name: String, merge_mode: MergeMode = 0, custom_context: Object = null, backward_undo_ops: bool = false)
void	force_fixed_history()
UndoRedo	get_history_undo_redo(id: int) const
int	get_object_history_id(object: Object) const
bool	is_committing_action() const

Signals

history_changed() 🔗

Emitted when the list of actions in any history has changed, either when an action is committed or a history is cleared.

version_changed() 🔗

Emitted when the version of any history has changed as a result of undo or redo call.

Enumerations

enum SpecialHistory: 🔗

SpecialHistory GLOBAL_HISTORY = 0

Global history not associated with any scene, but with external resources etc.

SpecialHistory REMOTE_HISTORY = -9

History associated with remote inspector. Used when live editing a running project.

SpecialHistory INVALID_HISTORY = -99

Invalid "null" history. It's a special value, not associated with any object.

Method Descriptions

void add_do_method(object: Object, method: StringName, ...) vararg 🔗

Register a method that will be called when the action is committed (i.e. the "do" action).

If this is the first operation, the object will be used to deduce target undo history.

void add_do_property(object: Object, property: StringName, value: Variant) 🔗

Register a property value change for "do".

If this is the first operation, the object will be used to deduce target undo history.

void add_do_reference(object: Object) 🔗

Register a reference for "do" that will be erased if the "do" history is lost. This is useful mostly for new nodes created for the "do" call. Do not use for resources.

void add_undo_method(object: Object, method: StringName, ...) vararg 🔗

Register a method that will be called when the action is undone (i.e. the "undo" action).

If this is the first operation, the object will be used to deduce target undo history.

void add_undo_property(object: Object, property: StringName, value: Variant) 🔗

Register a property value change for "undo".

If this is the first operation, the object will be used to deduce target undo history.

void add_undo_reference(object: Object) 🔗

Register a reference for "undo" that will be erased if the "undo" history is lost. This is useful mostly for nodes removed with the "do" call (not the "undo" call!).

void clear_history(id: int = -99, increase_version: bool = true) 🔗

Clears the given undo history. You can clear history for a specific scene, global history, or for all scenes at once if id is INVALID_HISTORY.

If increase_version is true, the undo history version will be increased, marking it as unsaved. Useful for operations that modify the scene, but don't support undo.

var scene_root = EditorInterface.get_edited_scene_root()
var undo_redo = EditorInterface.get_editor_undo_redo()
undo_redo.clear_history(undo_redo.get_object_history_id(scene_root))

Note: If you want to mark an edited scene as unsaved without clearing its history, use EditorInterface.mark_scene_as_unsaved instead.

void commit_action(execute: bool = true) 🔗

Commits the action. If execute is true (default), all "do" methods/properties are called/set when this function is called.

void create_action(name: String, merge_mode: MergeMode = 0, custom_context: Object = null, backward_undo_ops: bool = false) 🔗

Create a new action. After this is called, do all your calls to add_do_method, add_undo_method, add_do_property, and add_undo_property, then commit the action with commit_action.

The way actions are merged is dictated by the merge_mode argument. See MergeMode for details.

If custom_context object is provided, it will be used for deducing target history (instead of using the first operation).

The way undo operation are ordered in actions is dictated by backward_undo_ops. When backward_undo_ops is false undo option are ordered in the same order they were added. Which means the first operation to be added will be the first to be undone.

void force_fixed_history() 🔗

Forces the next operation (e.g. add_do_method) to use the action's history rather than guessing it from the object. This is sometimes needed when a history can't be correctly determined, like for a nested resource that doesn't have a path yet.

This method should only be used when absolutely necessary, otherwise it might cause invalid history state. For most of complex cases, the custom_context parameter of create_action is sufficient.

UndoRedo get_history_undo_redo(id: int) const 🔗

Returns the UndoRedo object associated with the given history id.

id above 0 are mapped to the opened scene tabs (but it doesn't match their order). id of 0 or lower have special meaning (see SpecialHistory).

Best used with get_object_history_id. This method is only provided in case you need some more advanced methods of UndoRedo (but keep in mind that directly operating on the UndoRedo object might affect editor's stability).

int get_object_history_id(object: Object) const 🔗

Returns the history ID deduced from the given object. It can be used with get_history_undo_redo.

bool is_committing_action() const 🔗

Returns true if the EditorUndoRedoManager is currently committing the action, i.e. running its "do" method or property change (see commit_action).