13 lines
665 B
TypeScript
13 lines
665 B
TypeScript
/** Positive movement means pulling the previous page down; negative means pushing to the next. */
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export function swipeDirection(distance: number, velocity: number, height: number): -1 | 0 | 1 {
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if (height <= 0) return 0;
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const committed = Math.abs(distance) > height * .19 || (Math.abs(velocity) > .4 && Math.abs(distance) > 20);
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return committed ? (distance < 0 ? 1 : -1) : 0;
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}
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/** Three unique videos are kept mounted and repositioned around the active page. */
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export function pagePosition(videoIndex: number, activeIndex: number): -1 | 0 | 1 {
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const relative = (videoIndex - activeIndex + 3) % 3;
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return relative === 2 ? -1 : relative as 0 | 1;
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}
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