Anton A S 824193ab7a Sync specs & docs: canvas-native text editing, font-kit, variables dialog

- Merge from master: 19 commits (text editing, system fonts, variables UI)
- Update specs: text-editing (canvas-native, TextEditor, phantom textarea,
  font picker, keyboard nav, mouse selection), canvas-rendering (selection
  rects, blinking caret), editor-ui (Variables dialog with TanStack Table,
  ColorInput, alpha checkerboard, demo collections), desktop-app (font-kit
  commands, CSS font faces, app identity), undo-redo (variable operations)
- Update docs: features (text editing, font picker, variables, undo),
  figma-comparison (notes for text/fonts/variables rows),
  roadmap (Phase 4 delivered items)
- Archive sync-text-editing-fonts-variables-ui change

2026-03-01 09:47:46 +03:00

1.8 KiB

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undo-redo Specification

Purpose

Inverse-command undo/redo system. Records the inverse of every operation, enabling ⌘Z/⇧⌘Z across all editor actions (create, delete, move, resize, rotate, property changes).

Requirements

Requirement: Inverse-command undo

The undo system SHALL use an inverse-command pattern where every operation records its inverse. ⌘Z SHALL undo and ⇧⌘Z SHALL redo.

Scenario: Undo a move

WHEN user moves a node and presses ⌘Z
THEN the node returns to its original position

Scenario: Redo after undo

WHEN user undoes a move and presses ⇧⌘Z
THEN the node moves back to the position after the original move

Requirement: All operations undoable

Undo/redo SHALL be wired into all editor operations: create, delete, move, resize, rotate, property changes, reparent, layout changes, and variable operations (create/delete variable, create collection, rename variable, rename collection, change variable color/value). Each variable mutation pushes an undo entry with forward and inverse callbacks.

Scenario: Undo node creation

WHEN user creates a rectangle and presses ⌘Z
THEN the rectangle is removed from the scene graph

Scenario: Undo property change

WHEN user changes a node's fill color from blue to red and presses ⌘Z
THEN the fill color reverts to blue

Scenario: Undo variable creation

WHEN user creates a variable and presses ⌘Z
THEN the variable is removed from the scene graph

Scenario: Undo variable rename

WHEN user renames a variable and presses ⌘Z
THEN the variable name reverts to the previous value

Scenario: Undo collection rename

WHEN user renames a collection and presses ⌘Z
THEN the collection name reverts to the previous value

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