| 1 | // Run: tsx src/__tests__/resize-drag.test.ts |
| 2 | |
| 3 | import { createRafResizeUpdater } from "../lib/resizeDrag"; |
| 4 | |
| 5 | let passed = 0; |
| 6 | let failed = 0; |
| 7 | |
| 8 | function eq(a: unknown, b: unknown, label: string) { |
| 9 | if (a === b) { |
| 10 | process.stdout.write(` PASS ${label}\n`); |
| 11 | passed += 1; |
| 12 | } else { |
| 13 | process.stdout.write(` FAIL ${label}: expected ${JSON.stringify(b)}, got ${JSON.stringify(a)}\n`); |
| 14 | failed += 1; |
| 15 | } |
| 16 | } |
| 17 | |
| 18 | console.log("\nresizeDrag"); |
| 19 | |
| 20 | const frames: FrameRequestCallback[] = []; |
| 21 | const originalRequestAnimationFrame = globalThis.requestAnimationFrame; |
| 22 | const originalCancelAnimationFrame = globalThis.cancelAnimationFrame; |
| 23 | globalThis.requestAnimationFrame = ((callback: FrameRequestCallback) => { |
| 24 | frames.push(callback); |
| 25 | return frames.length; |
| 26 | }) as typeof requestAnimationFrame; |
| 27 | globalThis.cancelAnimationFrame = ((id: number) => { |
| 28 | frames[id - 1] = () => undefined; |
| 29 | }) as typeof cancelAnimationFrame; |
| 30 | |
| 31 | try { |
| 32 | const applied: Array<[string, string]> = []; |
| 33 | const attrs: Record<string, string> = {}; |
| 34 | const updater = createRafResizeUpdater({ |
| 35 | target: { |
| 36 | style: { |
| 37 | setProperty(name: string, value: string) { |
| 38 | applied.push([name, value]); |
| 39 | }, |
| 40 | }, |
| 41 | }, |
| 42 | separator: { |
| 43 | setAttribute(name: string, value: string) { |
| 44 | attrs[name] = value; |
| 45 | }, |
| 46 | }, |
| 47 | cssVar: "--pane-width", |
| 48 | }); |
| 49 | |
| 50 | updater.schedule(101.2); |
| 51 | updater.schedule(148.7); |
| 52 | eq(applied.length, 0, "live resize waits for animation frame"); |
| 53 | eq(frames.length, 1, "multiple pointer moves share one animation frame"); |
| 54 | frames[0](0); |
| 55 | eq(applied.length, 1, "one frame applies one live resize"); |
| 56 | eq(applied[0]?.[0], "--pane-width", "live resize writes the configured CSS variable"); |
| 57 | eq(applied[0]?.[1], "149px", "live resize applies the latest rounded pixel value"); |
| 58 | eq(attrs["aria-valuenow"], "149", "live resize keeps separator ARIA in sync"); |
| 59 | |
| 60 | frames.length = 0; |
| 61 | const flushed: Array<[string, string]> = []; |
| 62 | const flushUpdater = createRafResizeUpdater({ |
| 63 | target: { |
| 64 | style: { |
| 65 | setProperty(name: string, value: string) { |
| 66 | flushed.push([name, value]); |
| 67 | }, |
| 68 | }, |
| 69 | }, |
| 70 | cssVar: "--pane-width", |
| 71 | }); |
| 72 | flushUpdater.schedule(600); |
| 73 | frames[0](0); |
| 74 | flushUpdater.schedule(420); |
| 75 | eq(flushed[flushed.length - 1]?.[1], "600px", "pending final resize waits for animation frame before flush"); |
| 76 | flushUpdater.flush(); |
| 77 | eq(flushed[flushed.length - 1]?.[1], "420px", "flush applies the final resize before React state commits"); |
| 78 | |
| 79 | frames.length = 0; |
| 80 | const appliedValues: number[] = []; |
| 81 | const callbackUpdater = createRafResizeUpdater({ |
| 82 | target: { |
| 83 | style: { |
| 84 | setProperty() { |
| 85 | // CSS write is covered above; this block checks the synchronized callback contract. |
| 86 | }, |
| 87 | }, |
| 88 | }, |
| 89 | cssVar: "--pane-width", |
| 90 | onApply(value) { |
| 91 | appliedValues.push(value); |
| 92 | }, |
| 93 | }); |
| 94 | callbackUpdater.schedule(279.7); |
| 95 | callbackUpdater.schedule(300.2); |
| 96 | eq(appliedValues.length, 0, "live resize callback waits for animation frame"); |
| 97 | frames[0](0); |
| 98 | eq(appliedValues.join(","), "300", "live resize callback receives the applied rounded value"); |
| 99 | } finally { |
| 100 | globalThis.requestAnimationFrame = originalRequestAnimationFrame; |
| 101 | globalThis.cancelAnimationFrame = originalCancelAnimationFrame; |
| 102 | } |
| 103 | |
| 104 | console.log(`\n${passed} passed, ${failed} failed, ${passed + failed} total`); |
| 105 | if (failed > 0) process.exit(1); |
| 106 |