Method updateTranslationToggle

js/ReadingSystem.js:828–852

* 更新翻译切换 UI

()

   * 更新翻译切换 UI
   */
  updateTranslationToggle() {
    if (!this.dom.toggleTranslationBtn) return;

    const mode = this.state.translationMode;
    toggleClass(document.body, 'hide-translation', mode === 'hide');
    toggleClass(document.body, 'blur-translation', mode === 'blur');

    let text = '中';
    let pressed = 'true';
    let label = '翻译显示';

    if (mode === 'blur') {
      text = '糊';
      pressed = 'mixed';
      label = '翻译模糊显示';
    } else if (mode === 'hide') {
      text = '英';
      pressed = 'false';
      label = '仅显示英文';
    }

    setText(this.dom.toggleTranslationBtn, text);
    this.dom.toggleTranslationBtn.setAttribute('aria-pressed', pressed);
    this.dom.toggleTranslationBtn.setAttribute('aria-label', label);
  }

  // =========================================================================
  // 资源预加载