Grid Fixed

<script setup lang="ts">
import type { Ref } from 'vue';

import { VirtualScroll } from '@pdanpdan/virtual-scroll';
import { computed, inject, ref } from 'vue';

import ExampleContainer from '#/components/ExampleContainer.vue';
import ScrollControls from '#/components/ScrollControls.vue';
import ScrollStatus from '#/components/ScrollStatus.vue';
import { useExampleScroll } from '#/lib/useExampleScroll';

import { html as highlightedCode } from './+Page.vue?highlight';

const itemCount = ref(1000);
const itemSize = ref(80);
const columnCount = ref(100);
const columnWidth = ref(100);
const bufferBefore = ref(5);
const bufferAfter = ref(5);
const stickyHeader = ref(false);
const stickyFooter = ref(false);

const columnWidths = computed(() => [ columnWidth.value, Math.ceil(columnWidth.value * 1.5) ]);

const items = computed(() => Array.from({ length: itemCount.value }, (_, i) => ({
  id: i,
})));

const {
  virtualScrollRef,
  scrollDetails,
  onScroll,
  handleScrollToIndex,
  handleScrollToOffset,
} = useExampleScroll();

const debugMode = inject<Ref<boolean>>('debugMode', ref(false));
</script>

<template>
  <ExampleContainer :code="highlightedCode">
    <template #title>
      <span class="example-title example-title--group-4">Grid Fixed</span>
    </template>

    <template #description>
      Simultaneously virtualizes {{ itemCount.toLocaleString() }} rows and {{ columnCount.toLocaleString() }} columns. Uses fixed <strong>itemSize</strong> ({{ itemSize }}px) and alternating <strong>columnWidth</strong> values. Panning in any direction maintains high performance.
    </template>

    <template #icon>
      <svg
        xmlns="http://www.w3.org/2000/svg"
        fill="none"
        viewBox="0 0 24 24"
        stroke-width="1.5"
        stroke="currentColor"
        class="example-icon example-icon--group-4"
      >
        <path stroke-linecap="round" stroke-linejoin="round" d="M3.75 6A2.25 2.25 0 0 1 6 3.75h2.25A2.25 2.25 0 0 1 10.5 6v2.25a2.25 2.25 0 0 1-2.25 2.25H6.15a2.25 2.25 0 0 1-2.25-2.25V6ZM3.75 15.75A2.25 2.25 0 0 1 6 13.5h2.25a2.25 2.25 0 0 1 2.25 2.25V18a2.25 2.25 0 0 1-2.25 2.25H6a2.25 2.25 0 0 1-2.25-2.25v-2.25ZM13.5 6a2.25 2.25 0 0 1 2.25-2.25H18A2.25 2.25 0 0 1 20.25 6v2.25A2.25 2.25 0 0 1 18 10.5h-2.25a2.25 2.25 0 0 1-2.25-2.25V6ZM13.5 15.75a2.25 2.25 0 0 1 2.25-2.25H18a2.25 2.25 0 0 1 2.25 2.25V18A2.25 2.25 0 0 1 18 20.25h-2.25A2.25 2.25 0 0 1 13.5 18v-2.25Z" />
      </svg>
    </template>

    <template #subtitle>
      Bidirectional scrolling with uniform dimensions
    </template>

    <template #controls>
      <ScrollStatus
        :scroll-details="scrollDetails"
        direction="both"
        :column-range="virtualScrollRef?.columnRange"
      />
      <ScrollControls
        v-model:item-count="itemCount"
        v-model:item-size="itemSize"
        v-model:column-count="columnCount"
        v-model:column-width="columnWidth"
        v-model:buffer-before="bufferBefore"
        v-model:buffer-after="bufferAfter"
        v-model:sticky-header="stickyHeader"
        v-model:sticky-footer="stickyFooter"
        direction="both"
        @scroll-to-index="handleScrollToIndex"
        @scroll-to-offset="handleScrollToOffset"
        @refresh="virtualScrollRef?.refresh()"
      />
    </template>

    <VirtualScroll
      ref="virtualScrollRef"
      :debug="debugMode"
      class="example-container"
      direction="both"
      :items="items"
      :item-size="itemSize"
      :column-count="columnCount"
      :column-width="columnWidths"
      :buffer-before="bufferBefore"
      :buffer-after="bufferAfter"
      :sticky-header="stickyHeader"
      :sticky-footer="stickyFooter"
      aria-label="Fixed dimensions grid"
      @scroll="onScroll"
    >
      <template v-if="stickyHeader" #header>
        <div class="example-sticky-header">
          Grid Header
        </div>
      </template>

      <template #item="{ index, columnRange, getColumnWidth, getCellAriaProps }">
        <div :key="`r_${ index }`" class="example-grid-row">
          <div
            v-for="c in (columnRange.end - columnRange.start)"
            :key="`r_${ index }_c_${ columnRange.start + c - 1 }`"
            :data-col-index="columnRange.start + c - 1"
            class="example-grid-cell"
            :style="{ inlineSize: `${ getColumnWidth(columnRange.start + c - 1) }px` }"
            v-bind="getCellAriaProps(columnRange.start + c - 1)"
          >
            <div class="example-badge mb-2">R{{ index }} &times; C{{ columnRange.start + c - 1 }}</div>
            <div class="opacity-40 tabular-nums">{{ getColumnWidth(columnRange.start + c - 1) }}px</div>
          </div>
        </div>
      </template>

      <template v-if="stickyFooter" #footer>
        <div class="example-sticky-footer">
          End of Grid
        </div>
      </template>
    </VirtualScroll>
  </ExampleContainer>
</template>