HTML如何设置画中画窗口样式？picture-in-picture-window伪类的用法是什么？

::picture-in-picture-window

::picture-in-picture-window

::picture-in-picture-window {
  /* 调整画中画窗口的大小 */
  width: 320px;
  height: 180px;

  /* 设置画中画窗口的位置 */
  position: absolute;
  top: 10px;
  right: 10px;

  /* 添加边框 */
  border: 2px solid red;

  /* 设置圆角 */
  border-radius: 5px;

  /* 其他样式 */
  background-color: rgba(0, 0, 0, 0.8);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

document

pictureInPictureEnabled

if ('pictureInPictureEnabled' in document) {
  console.log('浏览器支持画中画 API');
} else {
  console.log('浏览器不支持画中画 API');
}

const video = document.getElementById('myVideo');

video.addEventListener('enterpictureinpicture', () => {
  // 画中画模式已启用
  console.log('进入画中画模式');
});

video.addEventListener('leavepictureinpicture', () => {
  // 画中画模式已禁用
  console.log('退出画中画模式');
});

<div id="customControls">
  <button id="playPauseButton">播放/暂停</button>
  <button id="closeButton">关闭</button>
</div>

const playPauseButton = document.getElementById('playPauseButton');
const closeButton = document.getElementById('closeButton');

playPauseButton.addEventListener('click', () => {
  if (video.paused) {
    video.play();
  } else {
    video.pause();
  }
});

closeButton.addEventListener('click', async () => {
  await document.exitPictureInPicture();
});

::cue

ResizeObserver

const observer = new ResizeObserver(entries => {
  entries.forEach(entry => {
    const { width, height } = entry.contentRect;
    console.log(`画中画窗口大小已更改：width=${width}, height=${height}`);

    // 在这里动态调整样式
    const pipWindow = document.querySelector('::picture-in-picture-window');
    if (pipWindow) {
      pipWindow.style.width = width + 'px';
      pipWindow.style.height = height + 'px';
    }
  });
});

// 获取画中画窗口元素 (需要等待画中画模式启用后才能获取)
video.addEventListener('enterpictureinpicture', () => {
  const pipWindow = document.querySelector('::picture-in-picture-window');
  if (pipWindow) {
    observer.observe(pipWindow);
  }
});

video.addEventListener('leavepictureinpicture', () => {
  observer.disconnect(); // 停止监听
});

::picture-in-picture-window

::picture-in-picture-window

<div id="customContent">
  <h1>自定义内容</h1>
  <p>这是一段文本。</p>
  <img src="image.png" alt="图像">
</div>

::picture-in-picture-window

video.addEventListener('enterpictureinpicture', () => {
  const pipWindow = document.querySelector('::picture-in-picture-window');
  if (pipWindow) {
    const customContent = document.getElementById('customContent');
    // 创建一个浮动层
    const overlay = document.createElement('div');
    overlay.id = 'pipOverlay';
    overlay.style.position = 'absolute';
    overlay.style.top = '0';
    overlay.style.left = '0';
    overlay.style.width = pipWindow.offsetWidth + 'px';
    overlay.style.height = pipWindow.offsetHeight + 'px';
    overlay.style.zIndex = '1000'; // 确保在画中画窗口之上
    overlay.appendChild(customContent);

    // 将浮动层添加到 body 中
    document.body.appendChild(overlay);

    // 监听画中画窗口的尺寸变化，并调整浮动层的大小
    const observer = new ResizeObserver(entries => {
      entries.forEach(entry => {
        const { width, height } = entry.contentRect;
        overlay.style.width = width + 'px';
        overlay.style.height = height + 'px';
      });
    });
    observer.observe(pipWindow);

    // 在退出画中画模式时移除浮动层
    video.addEventListener('leavepictureinpicture', () => {
      document.body.removeChild(overlay);
      observer.disconnect();
    }, { once: true }); // 确保只执行一次
  }
});