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Designer guide Toolbar history and dirty state

Undo, redo, and saving — Visual Service Design

History records user actions, not every reactive update. Property edits and moves use compact before/after changes; structural edits retain a snapshot fallback.

When to use

Use this page while editing or reviewing the graph in the designer.

Behavior

  • Use toolbar Undo and Redo for property edits, additions, removals, connections, and component changes. Compound model actions, such as inserting a Split and rewiring its consumers, form one history entry.
  • One drag creates one move action, even for a component or a multi-node selection; pointer updates do not become hundreds of history entries. Property changes are restored directly, while structural snapshots reconstruct the model and reconcile selections.
  • The Save button is enabled only when the project is dirty. Saving records the current model as the saved baseline.
  • The project menu in the application bar contains New, Load, Save, Save As, Generate project, and Download Python project. Loading another project with unsaved changes opens a Save, Discard, or Cancel guard.
  • The top toolbar also exposes sign-in or sign-out and language controls; these do not change graph semantics.

Toolbar actions properties

Editing actions shown in the application bar.

IconActionDescription
Undo

Reverses the previous user action.

Redo

Reapplies the next undone action.

Save

Persists the current project and clears the dirty indicator.

Configuration example

Open the designer and select Graph.