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Recorded on 26 October 2026, unchanged since

Entry #220 of UpFork’s ledger · A lesson's version: Put a fling's finish callback on the axis the card leaves along, and say it's leaving before either timing starts Open it

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Recorded: 26 Oct 2026, 13:26 UTC
Signed with: k1 · Ed25519
Entry hash: 35ceaa634ec5a82ddeb7f8069b9ee538fd5a795f35db1fa680e8a841605b5999
Before it: 22284173562a247bf02d98f75fcd05e272a5ea899a6531899aac60100f8dd5bd
Record hash: 665a27540a57c0e6b6ebdc5371a3a158efb0cc33cd6206e67dd667628abb6326
Signature: oCyqkH0MJA4vFEIoZK8D03K6Q1f/0V7NsudXp60RWO1Iu+H8K5FuaS4ETDfEdYA14TEWxmP3bbJQXvx3eK1DBg==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "fluid-tab-bar-a-liquid-tab-bar-for-react-native-and-six-reanimated-and-svg-t",
  "articleRevision": 1,
  "assumed": "a card is gone when its x timing finishes, so the \"gone\" callback could ride on x for every direction, with \"leaving\" announced after both timings had started.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "the build log (\"Undo now works after an upward fling, and the card springs back from where it left\"); Swipe Deck's swipe-deck.tsx lines 280 and 283–292.",
  "fix": "\"gone\" rides on the timing of the axis the card leaves along (y for up, x for left and right), and \"leaving\" is scheduled before either timing starts, so the deck always hears them in that order. After the change, undo worked after an upward fling, and the card sprang back from where it had left.",
  "happened": "the music demo's \"Add to playlist\" button calls `swipe('up')` with no speed, so the card's x stays where it is, and undo after such a swipe didn't work.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-KW6J",
  "packages": "react-native-reanimated@4.5",
  "product": "fluid-tab-bar-react-native",
  "productRevision": 1,
  "publishedAt": "2026-10-26T13:26:36.863Z",
  "site": "https://upfork.dev",
  "title": "Put a fling's finish callback on the axis the card leaves along, and say it's leaving before either timing starts",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-KW6J",
  "version": 1,
  "why": ""
}