<script lang="ts">
  import { VirtualList, type SlotAttributes } from 'svelte-virtuallists';

  interface MyItemsData {
    text: string;
    lineHeight: string;
    width: string;
  }

  const myModel: Array<MyItemsData> = new Array(10000).fill(1).map((v, i) => ({
    text: 'Item ' + i,
    lineHeight: 20 + (i % 20) + 'px',
    width: 100 + (i % 30) + 'px'
  }));

  let itemSize = 50;
</script>

<div class="actions">
  <label for="item-height">
    Item Height:
    <div class="range">
      <input type="range" id="item-height" step="5" min="50" max="155" bind:value={itemSize} />
    </div>
  </label>
</div>

<div class="list">
  <VirtualList model={myModel} height={500} width="auto" modelCount={myModel.length} {itemSize}>
    {#snippet slot({ item, style, index: _index }: SlotAttributes<MyItemsData>)}
      <div class="row" {style}>
        {item.text}
      </div>
    {/snippet}
  </VirtualList>
</div>

<style>
  :global(body),
  :global(html) {
    height: 100%;
    margin: 0;
    background-color: rgb(249, 249, 249);
  }

  :global(.virtual-list-wrapper) {
    margin: 20px;
    background: #fff;
    border-radius: 2px;
    box-shadow:
      0 2px 2px 0 rgba(0, 0, 0, 0.14),
      0 3px 1px -2px rgba(0, 0, 0, 0.2),
      0 1px 5px 0 rgba(0, 0, 0, 0.12);
    background: #fafafa;
    font-family: -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
    color: #333;
    -webkit-font-smoothing: antialiased;
  }

  .row {
    padding: 0 15px;
    border-bottom: 1px solid #eee;
    box-sizing: border-box;
    line-height: 50px;
    font-weight: 500;
    background: #fff;
  }

  .actions {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    padding: 0 20px;
    padding-top: 15px;
    -webkit-box-pack: justify;
    -ms-flex-pack: justify;
    justify-content: space-between;
  }

  .actions label {
    padding: 10px 0;
    font-size: 18px;
    color: #999;
    font-family: -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
  }

  .range {
    position: relative;
    top: -1px;
    display: inline-block;
    margin-left: 15px;
    width: 250px;
  }

  :global(input[type='range']) {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    height: 10px;
    border-radius: 5px;
    background: #d7dcdf;
    outline: none;
    padding: 0;
    margin: 0;
  }

  :global(input[type='range']),
  :global(input[type='range']) *,
  :global(input[type='range']:after),
  :global(input[type='range']:before) {
    box-sizing: border-box;
  }

  :global(input[type='range']::-webkit-slider-thumb) {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #2c3e50;
    cursor: pointer;
    transition: background 0.15s ease-in-out;
  }

  :global(input[type='range']::-webkit-slider-thumb:hover),
  :global(input[type='range']:active::-webkit-slider-thumb) {
    background: #008cff;
  }

  :global(input[type='range']::-moz-range-thumb) {
    width: 20px;
    height: 20px;
    border: 0;
    border-radius: 50%;
    background: #2c3e50;
    cursor: pointer;
    transition: background 0.15s ease-in-out;
  }

  :global(input[type='range']::-moz-range-thumb:hover),
  :global(input[type='range']:active::-moz-range-thumb) {
    background: #008cff;
  }

  :global(::-moz-range-track) {
    background: #d7dcdf;
    border: 0;
  }

  :global(input::-moz-focus-inner),
  :global(input::-moz-focus-outer) {
    border: 0;
  }
</style>