feat(studio): visualize loop/parallel/try_catch nested regions on the flow canvas (#2670 Phase 1) by os-zhuang · Pull Request #2675 · objectstack-ai/objectui

os-zhuang · 2026-07-19T08:48:58Z

Summary

Phase 1 of #2670 — the ADR-0031 "designer rendering" follow-up to the Runs-panel nesting (#2667). The flow designer canvas rendered structured control-flow containers (loop / parallel / try_catch) as opaque single node cards; their nested regions (config.body / config.branches[] / config.try/catch) were only visible — and only editable — as raw JSON in the inspector's Advanced block.

A container card now carries a "show nested regions" control that opens a read-only popover rendering the region(s) as a mini-canvas — the same top-to-bottom node/edge layout as the parent graph — so an author can see the structure without reading JSON.

What changed

flow-canvas-layout.ts — extractRegions(node) (pure): pulls a container's labeled regions from config. Returns [] for ordinary nodes and for a legacy flat loop (no config.body), which stay plain cards.
flow-region-view.tsx (new) — a read-only mini-canvas for a region: reuses the shared computeLayout / diagramSize / edgePath at full scale, then fits the whole region to the popover width with a single CSS transform. No new layout engine.
flow-canvas-parts.tsx (NodeCard) — when a node has regions, a chevron control opens a Popover with the region view, each region headed by its label (a named branch or Branch N, and Try / Catch; a loop body has none).
FlowCanvas.tsx — passes extractRegions(node) to each card.

Design note — why a popover (zero regression)

The region renders in a floating, portaled Popover, so it never overlaps the canvas's other nodes and requires no change to computeLayout, diagramSize, or the edge routing — every existing flat flow renders byte-identically. (An earlier inline-growth prototype overlapped the nodes below an expanded container; push-down layout would mean threading variable heights through the shared layout + edge anchors — deferred deliberately.)

Deferred to the next increments on #2670: inline push-down nesting on the canvas (regions embedded in the flow, siblings pushed down), nested selection + a structured region inspector, nested editing (add/drag/reparent), and client-side region validation. This PR does not close #2670.

Verification

flow-canvas-layout.test.ts — extractRegions unit tests (ordinary / legacy-loop / loop body / parallel-branch labels / try+catch).
FlowCanvas.test.tsx — render tests: opening a loop shows its body node; parallel branch labels (Branch 2) + handlers render; a legacy flat loop has no region control.
19/19 tests pass; turbo type-check clean; ESLint 0 errors.
Browser-verified in the offline preview gallery (Playwright): loop body, named + indexed parallel branches, and Try/Catch handlers all render in their popovers with the main flow chain intact and no overlap.

🤖 Generated with Claude Code

Generated by Claude Code

… flow canvas (#2670) Phase 1 of #2670 (ADR-0031 designer rendering follow-up to the Runs-panel nesting in #2667). The flow designer rendered `loop`/`parallel`/`try_catch` containers as opaque single cards; their nested regions (`config.body` / `config.branches[]` / `config.try`/`catch`) were only visible as raw JSON. - `extractRegions(node)` (flow-canvas-layout) — pure: pulls a container's labeled regions from config; returns [] for ordinary nodes and legacy flat loops. - `flow-region-view` — read-only mini-canvas for a region, reusing `computeLayout` / `diagramSize` / `edgePath` at full scale then fitting to width with one CSS transform (no new layout engine). - `NodeCard` — a container gains a "show nested regions" control that opens the region(s) in a Popover, each with a header (named branch / `Branch N` / `Try` / `Catch`). Floating + portaled, so it never overlaps canvas nodes and needs no change to the layout or edge routing — zero regression to existing flows. Read-only for now; inline push-down nesting and nested editing are the next increments on #2670. Adds `extractRegions` unit tests and FlowCanvas render tests (loop body, parallel branch labels, legacy-loop has no control). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VuvxWgoadqryqBcjs7TpVi

vercel · 2026-07-19T08:49:04Z

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Project	Deployment	Actions	Updated (UTC)
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github-actions · 2026-07-19T08:52:47Z

✅ Console Performance Budget

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Entry file	`index-DUp4SfSJ.js`	—
Status	PASS	—

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Size Limits

✅ Core packages should be < 50KB gzipped
✅ Component packages should be < 100KB gzipped
⚠️ Plugin packages should be < 150KB gzipped

github-actions Bot added the tests label Jul 19, 2026

os-zhuang marked this pull request as ready for review July 19, 2026 11:13

os-zhuang merged commit a4acca7 into main Jul 19, 2026
14 checks passed

os-zhuang deleted the claude/step-logs-run-observability-plxc2p branch July 19, 2026 11:13

This was referenced Jul 19, 2026

feat(studio): inline push-down expansion of loop/parallel/try_catch regions on the flow canvas (#2670 Phase 2) #2680

Merged

feat(flow-designer): #2670 Phase 3 — select & edit nested container nodes via the schema-driven inspector #2699

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feat(studio): visualize loop/parallel/try_catch nested regions on the flow canvas (#2670 Phase 1)#2675

feat(studio): visualize loop/parallel/try_catch nested regions on the flow canvas (#2670 Phase 1)#2675
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os-zhuang commented Jul 19, 2026

Summary

What changed

Design note — why a popover (zero regression)

Verification

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vercel Bot commented Jul 19, 2026

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github-actions Bot commented Jul 19, 2026

✅ Console Performance Budget

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