ButtonGrid

<script lang="ts">
  import {
    Button,
    ButtonGrid,
    type ButtonGridClickEvent,
    Pane
  } from 'svelte-tweakpane-ui';

  const keyboard = [
    ...Array.from(
      {
        length: 26
      },
      (_, index) => String.fromCodePoint(65 + index)
    ),
    ',',
    '.',
    '!',
    '⌫'
  ];

  let textBuffer = '';

  function handleClick(event: ButtonGridClickEvent) {
    textBuffer =
      event.detail.label === '⌫'
        ? textBuffer.slice(0, -1)
        : textBuffer + event.detail.label;
  }
</script>

<Pane position="inline" title="Austerity Keyboard">
  <ButtonGrid on:click={handleClick} buttons={keyboard} />
  <Button on:click={() => (textBuffer += '\u2002')} title=" " />
</Pane>

<div class="demo">
  <p>
    {textBuffer}
  </p>
</div>

<style>
  .demo {
    aspect-ratio: 1;
    width: 100%;
    background: linear-gradient(45deg, orange, magenta);
  }

  .demo > p {
    margin: 0;
    padding: 0.5rem;
    font-family: monospace;
    font-size: 2rem;
    line-height: 1.2;
    color: white;
    word-break: break-all;
    white-space: pre-wrap;
  }

  .demo > p::after {
    content: '_';
    opacity: 0.5;
  }
</style>