Closes the editing-affordance gap from PR 2a. The canvas is now in
full parity with the list view for everything that fits in a node
graph: connections, deletes, and adding nodes all work on-canvas.
Adds:
- Per-slot Handle components on the custom node renderer. Single-
outgoing types get one handle on the right edge; condition gets
`true` / `false` handles; send_buttons and send_list render slot
rows inside the card with one handle each, so the user can SEE
which button or list row they're wiring. Every non-start node
gets a target handle on the left.
- Drag-to-connect (`onConnect`). Looks up the source node, dispatches
the right config patch via the new `applyEdgeConnection(node,
sourceHandle, target)` helper, and routes through updateNodeConfig.
Rejects self-loops silently (a button whose target is its own node
= infinite reprompt).
- Keyboard delete on nodes (Backspace + Delete, both for cross-OS
parity). Routes through removeNode, which now ALSO unlinks every
inbound reference via the new `unlinkNodeReferences(nodes, key)`
helper. No more dangling arrows after a delete — the validator
previously flagged these as errors and the user had to chase them
down manually.
- Edge delete. Selecting an edge + Delete clears just that slot's
next_node_key (rather than removing anything), via the same
applyEdgeConnection helper passing "" as the target.
- Floating "+ Add node" button (React-Flow Panel, bottom-right).
Same dropdown as the list view; drops the new node at the visible
viewport center via reactFlow.screenToFlowPosition.
New pure helpers in src/lib/flows/edges.ts (no React, fully unit-
tested — 18 new tests, 319 total passing):
- outgoingSlots(node) — list of {id, label} per outgoing slot.
- applyEdgeConnection(node, sourceHandle, targetKey) — config patch
for a drag-to-connect, or null for unrecognised handles.
- unlinkNodeReferences(nodes, deletedKey) — clears every direct +
nested reference to deletedKey. Returns nodes-by-identity when
no reference matches to avoid needless re-renders.
The hook's removeNode is the only consumer of unlinkNodeReferences
right now, which means LIST-view deletes also stop leaving dangling
refs — strict improvement for both views.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Builds on PR 1's read-only canvas. This PR brings the canvas to ~75%
of list-view parity: drag-to-reposition (persisted) and click-to-edit
via a side panel that mounts the same per-node forms the list view
uses. Drag-to-connect + add/delete from canvas land in PR 2b.
Architecture (the bulk of the diff):
- Extracted the per-node forms (SendButtonsForm, SendListForm,
SendMediaForm, ConditionForm, SetTagForm + inline forms for the
smaller types) plus the shared field components (TextRow,
NextNodeRow, NodeKeySelect) from flow-builder.tsx into
src/components/flows/forms/. Both views now mount the SAME
NodeConfigForm dispatcher so behaviour can't drift between
"what the list editor shows" and "what the canvas side panel
shows".
- Lifted all editor state into a context/hook
(src/components/flows/flow-editor-state.tsx) with a
FlowEditorProvider that wraps both views in flow-editor-shell.
Single source of truth: toggling Canvas ⇄ List never resets
unsaved edits, and a drag on the canvas updates the same nodes
array the list view reads.
- flow-builder.tsx shrinks from ~2400 lines to ~900 (extracted
forms) and stops owning state (now consumes via useFlowEditor()).
List-only UI state — expanded cards, scroll refs, jump-to-node
flash — stays internal.
Canvas additions:
- onNodeDragStop writes the new position to context via
updateNodePosition (flips dirty; serialized in the existing PUT
/api/flows/[id] body — the route already accepts position_x /
position_y per migration 010).
- onNodeClick opens a controlled shadcn Sheet (right-side panel)
with the per-node form, plus "Set as entry" and "Delete node"
buttons. Esc / overlay / close button all close.
What's intentionally still NOT in this PR (PR 2b):
- Per-slot Handle components on the custom node renderer.
- Drag-to-connect handler that maps target → updated
next_node_key for the right slot.
- Floating "+" button to add nodes from canvas.
- Keyboard / context-menu delete.
Tests: 9 new pure-helper tests (uniqueNodeKey + defaultConfigFor
self-consistency). Hook integration tests are deferred — would
require @testing-library/react + jsdom infra. Existing 271 tests
still pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
