KuramitsuLab.github.io/pg.html at master · KuramitsuLab/KuramitsuLab.github.io · GitHub

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<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <title>CodePen風エディタ</title>
  <style>
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body { font-family: system-ui, sans-serif; background: #1e1e2e; color: #cdd6f4; height: 100vh; display: flex; flex-direction: column; }
    header { display: flex; align-items: center; justify-content: space-between; padding: 8px 16px; background: #181825; border-bottom: 1px solid #313244; }
    header h1 { font-size: 16px; font-weight: 600; }
    .toolbar { display: flex; gap: 8px; }
    button { background: #89b4fa; color: #1e1e2e; border: none; padding: 6px 16px; border-radius: 6px; font-size: 13px; cursor: pointer; font-weight: 600; }
    button:hover { background: #74c7ec; }
    button.secondary { background: #45475a; color: #cdd6f4; }
    button.secondary:hover { background: #585b70; }
    .main { display: flex; flex: 1; min-height: 0; }
    .editor-pane { flex: 1; display: flex; flex-direction: column; border-right: 2px solid #313244; }
    .preview-pane { flex: 1; display: flex; flex-direction: column; }
    .pane-header { padding: 6px 12px; background: #181825; font-size: 12px; font-weight: 600; color: #a6adc8; text-transform: uppercase; letter-spacing: 0.5px; }
    textarea { flex: 1; background: #1e1e2e; color: #cdd6f4; border: none; padding: 12px; font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace; font-size: 14px; line-height: 1.6; resize: none; tab-size: 2; outline: none; }
    iframe { flex: 1; border: none; background: white; }
    .layout-toggle { display: flex; gap: 4px; }
    .layout-toggle button { padding: 4px 8px; font-size: 11px; }
    @media (max-width: 768px) { .main { flex-direction: column; } .editor-pane { border-right: none; border-bottom: 2px solid #313244; } }
  </style>
</head>
<body>
  <header>
    <h1>CodePen</h1>
    <div class="toolbar">
      <button onclick="run()">▶ 実行</button>
      <button class="secondary" onclick="clearEditor()">クリア</button>
      <button class="secondary" onclick="saveFile()">保存</button>
      <button class="secondary" onclick="openFile()">開く</button>
      <input type="file" id="fileInput" accept=".html,.htm" style="display:none" onchange="handleOpen(event)">
      <button class="secondary" onclick="copyCode()">コピー</button>
      <button class="secondary" onclick="toggleLayout()">横/縦</button>
    </div>
  </header>
  <div class="main" id="main">
    <div class="editor-pane">
      <div class="pane-header">HTML / JavaScript</div>
      <textarea id="editor" spellcheck="false" placeholder="ここに HTML を貼り付けて「実行」を押してください"></textarea>
    </div>
    <div class="preview-pane">
      <div class="pane-header">プレビュー</div>
      <iframe id="preview"></iframe>
    </div>
  </div>

  <script>
    const editor = document.getElementById('editor');
    const preview = document.getElementById('preview');

    // 実行
    function run() {
      const code = editor.value;
      const doc = preview.contentDocument || preview.contentWindow.document;
      doc.open();
      doc.write(code);
      doc.close();
    }

    // クリア
    function clearEditor() {
      editor.value = '';
      const doc = preview.contentDocument || preview.contentWindow.document;
      doc.open();
      doc.write('');
      doc.close();
    }

    // コピー
    function copyCode() {
      navigator.clipboard.writeText(editor.value).then(() => {
        const btn = event.target;
        const orig = btn.textContent;
        btn.textContent = 'コピーしました';
        setTimeout(() => btn.textContent = orig, 1500);
      });
    }

    // HTMLファイルとして保存
    function saveFile() {
      const blob = new Blob([editor.value], { type: 'text/html' });
      const a = document.createElement('a');
      a.href = URL.createObjectURL(blob);
      a.download = 'index.html';
      a.click();
      URL.revokeObjectURL(a.href);
    }

    // ファイルを開く
    function openFile() {
      document.getElementById('fileInput').click();
    }

    function handleOpen(event) {
      const file = event.target.files[0];
      if (!file) return;
      const reader = new FileReader();
      reader.onload = (e) => {
        editor.value = e.target.result;
        run();
      };
      reader.readAsText(file);
      event.target.value = '';  // 同じファイルを再度開けるようにリセット
    }

    // レイアウト切り替え
    function toggleLayout() {
      const main = document.getElementById('main');
      main.style.flexDirection = main.style.flexDirection === 'column' ? 'row' : 'column';
    }

    // Tab キーでインデント
    editor.addEventListener('keydown', (e) => {
      if (e.key === 'Tab') {
        e.preventDefault();
        const start = editor.selectionStart;
        const end = editor.selectionEnd;
        editor.value = editor.value.substring(0, start) + '  ' + editor.value.substring(end);
        editor.selectionStart = editor.selectionEnd = start + 2;
      }
    });

    // Ctrl+Enter / Cmd+Enter で実行
    editor.addEventListener('keydown', (e) => {
      if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
        e.preventDefault();
        run();
      }
    });

    // サンプルコード
    editor.value = `<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <style>
    body {
      font-family: sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
      background: #f0f4f8;
    }
    .card {
      background: white;
      padding: 40px;
      border-radius: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      text-align: center;
    }
    #message { font-size: 24px; margin: 20px 0; }
    button {
      background: #4299e1;
      color: white;
      border: none;
      padding: 12px 32px;
      border-radius: 8px;
      font-size: 16px;
      cursor: pointer;
    }
  </style>
</head>
<body>
  <div class="card">
    <h1>ボタンを押してみて</h1>
    <p id="message">ここが変わります</p>
    <button onclick="changeMessage()">押す</button>
  </div>
  <script>
    function changeMessage() {
      document.getElementById('message').textContent = 'こんにちは！';
    }
  <\/script>
</body>
</html>`;

    // 初回実行
    run();
  </script>
</body>
</html>