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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | 1x 1x 1x 1x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 68x 68x 68x 3x 3x 3x 3x 3x 3x | import { h } from '../h';
import { For } from './For';
import { createVirtualizer } from './virtualizer';
import type { SignalGetter } from '../types';
interface VirtualForProps<T> {
each: SignalGetter<T[]>;
itemHeight: number;
children: (item: T, index: number) => HTMLElement;
placeholder?: HTMLElement;
overscan?: number;
class?: string;
style?: Record<string, string | SignalGetter<string>>;
}
export function VirtualFor<T>(props: VirtualForProps<T>): HTMLElement {
const { each, children, itemHeight, overscan, class: className, style } = props; //, placeholder
const virtualizer = createVirtualizer({
items: each,
itemHeight,
overscan,
});
const container = h.div({
ref: virtualizer.setContainer,
class: className,
role: 'list',
style: {
overflow: 'auto',
height: '100%',
...style,
},
});
const sizer = h.div({
style: {
position: 'relative',
height: () => `${virtualizer.totalHeight()}px`,
},
});
const content = h.div({
style: {
position: 'absolute',
top: '0',
left: '0',
width: '100%',
willChange: 'transform',
contain: 'layout',
transform: () => `translate3d(0, ${virtualizer.visibleState().scrollOffset}px, 0)`,
},
});
const renderedItems = For({
each: virtualizer.visibleItems,
key: (item) => item.index,
children: (itemSignal) => {
const it = itemSignal();
return children(it.data as T, it.index);
},
});
content.appendChild(renderedItems);
sizer.appendChild(content);
container.appendChild(sizer);
return container;
}
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