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Undo System

Purpose

Provide runtime undo/redo for editor-style operations (primarily transform changes) using a command stack and Input System shortcuts.

Type and location
Class OC.UI.Undo.RuntimeUndoSystem
Prefab object name UndoManager (child of Interactions)
Script Runtime/Undo/RuntimeUndoSystem.cs
Pattern MonoBehaviourSingleton<RuntimeUndoSystem>

Command interface

ICommand:

void Execute();
void Undo();
void Redo();

Built-in commands

Type File Use
TransformUndoAction TransformUndoCommand.cs Position/rotation/scale changes
UndoCommandGroup UndoCommandGroup.cs Batch multiple commands as one undo step

Execute(ICommand) pushes onto the undo stack and clears the redo stack. Undo() / Redo() pop stacks and invoke the command.

Transform handles call Capture before drag and Execute on release.

Input

Assign undo and redo actions from OC Input Actions on the UndoManager prefab instance.

Integration points

System Usage
RuntimeTransformHandle Move/rotate handle drags
TransformComponent Inspector vector field edits
RotationAxis, PositionPlane, etc. Handle sub-widgets

Setup

  1. Include Interactions prefab (contains UndoManager).
  2. Wire undo/redo input actions.
  3. Optional: enable _debug to log command types on undo/redo.

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