godot-docs/classes/class_editorundoredomanager.rst

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.. _class_EditorUndoRedoManager:

EditorUndoRedoManager
=====================

**Inherits:** :ref:`Object<class_Object>`

Manages undo history of scenes opened in the editor.

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Description
-----------

**EditorUndoRedoManager** is a manager for :ref:`UndoRedo<class_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 (:ref:`ProjectSettings<class_ProjectSettings>` edits, external resources, etc.), a separate global history is used.

The usage is mostly the same as :ref:`UndoRedo<class_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 :ref:`Node<class_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 Godot editor plugins. You can obtain it using :ref:`EditorPlugin.get_undo_redo<class_EditorPlugin_method_get_undo_redo>`. For non-editor uses or plugins that don't need to integrate with the editor's undo history, use :ref:`UndoRedo<class_UndoRedo>` instead.

The manager's API is mostly the same as in :ref:`UndoRedo<class_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 :ref:`Callable<class_Callable>`.

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Methods
-------

.. table::
   :widths: auto

   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`add_do_method<class_EditorUndoRedoManager_method_add_do_method>`\ (\ object\: :ref:`Object<class_Object>`, method\: :ref:`StringName<class_StringName>`, ...\ ) |vararg|                                                                                                         |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`add_do_property<class_EditorUndoRedoManager_method_add_do_property>`\ (\ object\: :ref:`Object<class_Object>`, property\: :ref:`StringName<class_StringName>`, value\: :ref:`Variant<class_Variant>`\ )                                                                          |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`add_do_reference<class_EditorUndoRedoManager_method_add_do_reference>`\ (\ object\: :ref:`Object<class_Object>`\ )                                                                                                                                                               |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`add_undo_method<class_EditorUndoRedoManager_method_add_undo_method>`\ (\ object\: :ref:`Object<class_Object>`, method\: :ref:`StringName<class_StringName>`, ...\ ) |vararg|                                                                                                     |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`add_undo_property<class_EditorUndoRedoManager_method_add_undo_property>`\ (\ object\: :ref:`Object<class_Object>`, property\: :ref:`StringName<class_StringName>`, value\: :ref:`Variant<class_Variant>`\ )                                                                      |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`add_undo_reference<class_EditorUndoRedoManager_method_add_undo_reference>`\ (\ object\: :ref:`Object<class_Object>`\ )                                                                                                                                                           |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`commit_action<class_EditorUndoRedoManager_method_commit_action>`\ (\ execute\: :ref:`bool<class_bool>` = true\ )                                                                                                                                                                 |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`create_action<class_EditorUndoRedoManager_method_create_action>`\ (\ name\: :ref:`String<class_String>`, merge_mode\: :ref:`MergeMode<enum_UndoRedo_MergeMode>` = 0, custom_context\: :ref:`Object<class_Object>` = null, backward_undo_ops\: :ref:`bool<class_bool>` = false\ ) |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                          | :ref:`force_fixed_history<class_EditorUndoRedoManager_method_force_fixed_history>`\ (\ )                                                                                                                                                                                               |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`UndoRedo<class_UndoRedo>` | :ref:`get_history_undo_redo<class_EditorUndoRedoManager_method_get_history_undo_redo>`\ (\ id\: :ref:`int<class_int>`\ ) |const|                                                                                                                                                       |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`           | :ref:`get_object_history_id<class_EditorUndoRedoManager_method_get_object_history_id>`\ (\ object\: :ref:`Object<class_Object>`\ ) |const|                                                                                                                                             |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`         | :ref:`is_committing_action<class_EditorUndoRedoManager_method_is_committing_action>`\ (\ ) |const|                                                                                                                                                                                     |
   +---------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

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Signals
-------

.. _class_EditorUndoRedoManager_signal_history_changed:

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**history_changed**\ (\ ) :ref:`🔗<class_EditorUndoRedoManager_signal_history_changed>`

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

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.. _class_EditorUndoRedoManager_signal_version_changed:

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**version_changed**\ (\ ) :ref:`🔗<class_EditorUndoRedoManager_signal_version_changed>`

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

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Enumerations
------------

.. _enum_EditorUndoRedoManager_SpecialHistory:

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enum **SpecialHistory**: :ref:`🔗<enum_EditorUndoRedoManager_SpecialHistory>`

.. _class_EditorUndoRedoManager_constant_GLOBAL_HISTORY:

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:ref:`SpecialHistory<enum_EditorUndoRedoManager_SpecialHistory>` **GLOBAL_HISTORY** = ``0``

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

.. _class_EditorUndoRedoManager_constant_REMOTE_HISTORY:

.. rst-class:: classref-enumeration-constant

:ref:`SpecialHistory<enum_EditorUndoRedoManager_SpecialHistory>` **REMOTE_HISTORY** = ``-9``

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

.. _class_EditorUndoRedoManager_constant_INVALID_HISTORY:

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:ref:`SpecialHistory<enum_EditorUndoRedoManager_SpecialHistory>` **INVALID_HISTORY** = ``-99``

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

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Method Descriptions
-------------------

.. _class_EditorUndoRedoManager_method_add_do_method:

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|void| **add_do_method**\ (\ object\: :ref:`Object<class_Object>`, method\: :ref:`StringName<class_StringName>`, ...\ ) |vararg| :ref:`🔗<class_EditorUndoRedoManager_method_add_do_method>`

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.

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.. _class_EditorUndoRedoManager_method_add_do_property:

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|void| **add_do_property**\ (\ object\: :ref:`Object<class_Object>`, property\: :ref:`StringName<class_StringName>`, value\: :ref:`Variant<class_Variant>`\ ) :ref:`🔗<class_EditorUndoRedoManager_method_add_do_property>`

Register a property value change for "do".

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

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.. _class_EditorUndoRedoManager_method_add_do_reference:

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|void| **add_do_reference**\ (\ object\: :ref:`Object<class_Object>`\ ) :ref:`🔗<class_EditorUndoRedoManager_method_add_do_reference>`

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.

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----

.. _class_EditorUndoRedoManager_method_add_undo_method:

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|void| **add_undo_method**\ (\ object\: :ref:`Object<class_Object>`, method\: :ref:`StringName<class_StringName>`, ...\ ) |vararg| :ref:`🔗<class_EditorUndoRedoManager_method_add_undo_method>`

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.

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.. _class_EditorUndoRedoManager_method_add_undo_property:

.. rst-class:: classref-method

|void| **add_undo_property**\ (\ object\: :ref:`Object<class_Object>`, property\: :ref:`StringName<class_StringName>`, value\: :ref:`Variant<class_Variant>`\ ) :ref:`🔗<class_EditorUndoRedoManager_method_add_undo_property>`

Register a property value change for "undo".

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

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.. _class_EditorUndoRedoManager_method_add_undo_reference:

.. rst-class:: classref-method

|void| **add_undo_reference**\ (\ object\: :ref:`Object<class_Object>`\ ) :ref:`🔗<class_EditorUndoRedoManager_method_add_undo_reference>`

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!).

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.. _class_EditorUndoRedoManager_method_commit_action:

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|void| **commit_action**\ (\ execute\: :ref:`bool<class_bool>` = true\ ) :ref:`🔗<class_EditorUndoRedoManager_method_commit_action>`

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

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.. _class_EditorUndoRedoManager_method_create_action:

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|void| **create_action**\ (\ name\: :ref:`String<class_String>`, merge_mode\: :ref:`MergeMode<enum_UndoRedo_MergeMode>` = 0, custom_context\: :ref:`Object<class_Object>` = null, backward_undo_ops\: :ref:`bool<class_bool>` = false\ ) :ref:`🔗<class_EditorUndoRedoManager_method_create_action>`

Create a new action. After this is called, do all your calls to :ref:`add_do_method<class_EditorUndoRedoManager_method_add_do_method>`, :ref:`add_undo_method<class_EditorUndoRedoManager_method_add_undo_method>`, :ref:`add_do_property<class_EditorUndoRedoManager_method_add_do_property>`, and :ref:`add_undo_property<class_EditorUndoRedoManager_method_add_undo_property>`, then commit the action with :ref:`commit_action<class_EditorUndoRedoManager_method_commit_action>`.

The way actions are merged is dictated by the ``merge_mode`` argument. See :ref:`MergeMode<enum_UndoRedo_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.

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.. _class_EditorUndoRedoManager_method_force_fixed_history:

.. rst-class:: classref-method

|void| **force_fixed_history**\ (\ ) :ref:`🔗<class_EditorUndoRedoManager_method_force_fixed_history>`

Forces the next operation (e.g. :ref:`add_do_method<class_EditorUndoRedoManager_method_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 :ref:`create_action<class_EditorUndoRedoManager_method_create_action>` is sufficient.

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.. _class_EditorUndoRedoManager_method_get_history_undo_redo:

.. rst-class:: classref-method

:ref:`UndoRedo<class_UndoRedo>` **get_history_undo_redo**\ (\ id\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_EditorUndoRedoManager_method_get_history_undo_redo>`

Returns the :ref:`UndoRedo<class_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 :ref:`SpecialHistory<enum_EditorUndoRedoManager_SpecialHistory>`).

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

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.. _class_EditorUndoRedoManager_method_get_object_history_id:

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:ref:`int<class_int>` **get_object_history_id**\ (\ object\: :ref:`Object<class_Object>`\ ) |const| :ref:`🔗<class_EditorUndoRedoManager_method_get_object_history_id>`

Returns the history ID deduced from the given ``object``. It can be used with :ref:`get_history_undo_redo<class_EditorUndoRedoManager_method_get_history_undo_redo>`.

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.. _class_EditorUndoRedoManager_method_is_committing_action:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **is_committing_action**\ (\ ) |const| :ref:`🔗<class_EditorUndoRedoManager_method_is_committing_action>`

Returns ``true`` if the **EditorUndoRedoManager** is currently committing the action, i.e. running its "do" method or property change (see :ref:`commit_action<class_EditorUndoRedoManager_method_commit_action>`).

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