agent
5a501a5c87
A quick one-finger flick toward a free side of the active page, once that edge is on screen, highlights and pulses the plus button on that side for three seconds. It never adds a page by itself, so ordinary panning can't create pages; a tap on the highlighted plus does. Fling detection lives in ink/fling.ts with tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GaoZtJQZwLXkEgWs8twCia
43 lines
1.3 KiB
TypeScript
43 lines
1.3 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { flingDir, pushSample, type Sample } from './fling';
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/** A straight drag from (0,0) by (dx,dy) over `ms`, sampled every 16 ms. */
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function drag(dx: number, dy: number, ms: number): Sample[] {
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const out: Sample[] = [];
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for (let t = 0; t <= ms; t += 16) pushSample(out, { x: (dx * t) / ms, y: (dy * t) / ms, t });
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return out;
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}
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describe('flingDir', () => {
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it('maps a flick to the side it reveals', () => {
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expect(flingDir(drag(-200, 0, 96))).toBe('right');
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expect(flingDir(drag(200, 0, 96))).toBe('left');
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expect(flingDir(drag(0, -200, 96))).toBe('down');
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expect(flingDir(drag(0, 200, 96))).toBe('up');
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});
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it('ignores slow drags', () => {
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expect(flingDir(drag(-200, 0, 800))).toBeNull();
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});
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it('ignores diagonal flicks', () => {
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expect(flingDir(drag(-200, -150, 96))).toBeNull();
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});
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it('ignores a drag that stops before lifting', () => {
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const s = drag(-300, 0, 96);
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const end = s.at(-1)!;
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for (let t = 16; t <= 160; t += 16) pushSample(s, { ...end, t: end.t + t });
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expect(flingDir(s)).toBeNull();
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});
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it('needs at least two samples', () => {
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expect(flingDir([])).toBeNull();
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expect(flingDir([{ x: 0, y: 0, t: 0 }])).toBeNull();
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});
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it('keeps the trail short', () => {
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const s = drag(-2000, 0, 2000);
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expect(s.at(-1)!.t - s[0].t).toBeLessThanOrEqual(216);
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});
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});
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