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ADR 0005 — Immediate-mode identity and events

Status: accepted

Identity

  • Key is a stable identity local to the parent. ID is CSS metadata only.
  • Without a key, identity is parent identity + local child position + element type.
  • Dynamic or reordered collections need explicit keys. Debug builds report duplicate sibling keys, stale Node use and suspicious unkeyed sequence changes.

Events

  • Input is hit-tested against the last committed layout. The target identity is queued, the UI loop wakes, pending events are batched and one frame is built.
  • The event is delivered to the matching element in that frame, is idempotent while the frame runs, and expires at the end of the frame.
  • No user code runs outside frame construction.
  • Pointer-backed controls may change the pointed value during their call, never keep the pointer, and later calls in the same frame see the new value.
  • Controls declared earlier in that frame painted the previous value, so every event batch is followed by exactly one event-free frame that shows the settled state. That frame schedules nothing further.
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1# ADR 0005 — Immediate-mode identity and events
2
3Status: accepted
4
5## Identity
6
7- `Key` is a stable identity local to the parent. `ID` is CSS metadata only.
8- Without a key, identity is `parent identity + local child position + element type`.
9- Dynamic or reordered collections need explicit keys. Debug builds report duplicate sibling keys, stale `Node` use and suspicious unkeyed sequence changes.
10
11## Events
12
13- Input is hit-tested against the last committed layout. The target identity is queued, the UI loop wakes, pending events are batched and one frame is built.
14- The event is delivered to the matching element in that frame, is idempotent while the frame runs, and expires at the end of the frame.
15- No user code runs outside frame construction.
16- Pointer-backed controls may change the pointed value during their call, never keep the pointer, and later calls in the same frame see the new value.
17- Controls declared earlier in that frame painted the previous value, so every event batch is followed by exactly one event-free frame that shows the settled state. That frame schedules nothing further.

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