82 lines
4.9 KiB
Markdown
82 lines
4.9 KiB
Markdown
# State transition bend editing — issue 23
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Branch-specific work above attachment source `53d01a3`, on
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`codex/state-bends-ytr83r-20260923`.
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[Issue 23](http://217.177.34.108:3000/sorokin.oleg.edu/ARCADIA-Studio/issues/23)
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owns live scope and acceptance. This document records the design; it does not
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assert completed verification or integration.
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The user asks to edit bends in State-machine connections as in architecture
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diagrams. State already renders `EdgeRoute.waypoints`; its missing capability is
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interactive authoring. Bends are positions in one saved diagram. They neither
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change transition endpoints/meaning nor belong to every view of the transition.
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## Interaction decision
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Use direct manipulation of an already selected transition: drag an exposed line
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segment to insert one bend, or drag an authored square handle to move that bend.
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An initial selection click changes no route. Endpoint circles retain semantic
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reconnect behavior; the separate attachment action retains its explicit mode.
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State vertices and action rows retain selection/movement precedence. Clicking
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a transition label selects it; this task does not introduce label dragging.
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The transition menu offers Add bend here when invoked on an eligible segment,
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or Add bend at the longest interior segment from Actions. Right-clicking an
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authored square offers Remove bend. Clear bends removes all authored waypoints
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in this view while retaining both attachment preferences and the label override.
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Existing transition Delete behavior stays explicit and separate; this design
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does not add a pin-specific Delete shortcut.
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Alternatives considered: an Edit bends mode makes the distinction visible but
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adds another persistent tool and cancellation/focus state; menu-only editing is
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discoverable but too slow for repeated shaping. Direct dragging plus explicit
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menu actions matches the existing architecture workflow without another mode.
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The menu provides a recovery path when a label or endpoint covers a line hit.
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## Invariants
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- Only an actual visible, unsuspended routed State transition can be edited.
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Internal transitions render as rows rather than lines. Folded endpoint proxies
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suspend authored routing. In both cases existing dormant waypoints survive;
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the UI disables operations instead of deleting metadata.
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- Generated elbows, mandatory endpoint leads and computed self-loop detours are
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routing output, not authored bends. Editing inserts one pin, never the entire
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computed polyline. The picked rendered-segment index determines insertion
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among stored pins, including reversed or overlapping traversals.
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- Movement requires three screen pixels. Dragged pins snap to the existing
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five-unit grid. A stationary press or return within three screen pixels
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restores the exact baseline, including imported off-grid coordinates and
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absence of a stored route. It creates no history entry.
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- Preview uses the actual routing engine and captured baseline. The model stays
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unchanged until release. A successful drag replaces only `waypoints` in the
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current route, leaving attachments, label, relation metadata and other views
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exact, in one existing `SetEdgeRoute` transaction.
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- A gesture belongs to its document, diagram, revision, interaction epoch,
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selected transition and viewport. Escape, pending edits, tool/context changes,
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camera/bounds changes, focus loss, pointer exit, outside release and a pan/menu
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interruption cancel it. A canceled preview must not supply menu pin indices.
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A delayed drag result must not apply after selecting another object.
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- Finite positions, valid indices and the existing 128-pin limit are checked at
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the command boundary. Exact no-ops are suppressed before execution.
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## Verification plan
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Use real canvas event tests at multiple zooms for insertion/movement, ordered
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cursor input, cancellation, exact return-to-press, preview invalidation and menu
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targets. Planner/app tests compare entire Projects and source bundles across
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Undo/Redo, preserve attachments/label/reference views, and refuse internal,
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folded, nonfinite, stale, pending and capacity-invalid operations. Exercise
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right-click during a provisional insertion and selection changes before queued
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commit admission. Retain existing attachment/reconnect and focused Delete tests.
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Then exercise the actual Windows application: add, move, remove and clear bends;
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check unchanged attachments and independent views; Save/Undo/Redo and reopen;
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observe menus, guidance, preview and normal close. Bind evidence to an identified
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source/binary and predeclared complete-Project expectations. Compilation alone
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does not establish interaction acceptance. Linux remains user-paused.
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Codex-956atf retains issue 16 resize and issue 27 integration ownership. This
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work uses the existing State model/router and needs composition with those
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contributions. It does not certify a combined release, change Process/Scenario
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notation, redesign automatic arrangement or adopt a new routing schema.
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