ScrollUp/index.html at main · urongda/ScrollUp · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>滚动高亮文本演示器</title>
  <style>
    html, body {
      height: 100%;
      margin: 0;
      padding: 0;
    }
    body {
      background: #181818;
      color: #eee;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', Arial, sans-serif;
      overflow: hidden;
      width: 100vw;
      height: 100vh;
    }
    #container {
      position: absolute;
      left: 0; right: 0; top: 0; bottom: 0;
      width: 100vw;
      height: 100vh;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      background: rgba(24,24,24,0.97);
    }
    .line {
      opacity: 0.25;
      transition: opacity 0.3s, color 0.3s, font-size 0.3s;
      font-size: clamp(1.2em, 4vw, 2.2em);
      line-height: 1.5em;
      width: 100vw;
      text-align: center;
      color: #b0b0b0;
      font-family: inherit;
      letter-spacing: 0.02em;
      user-select: none;
      white-space: nowrap;
    }
    .highlight {
      opacity: 1;
      color: #fff;
      background: #333;
      /* font-weight: bold; */
      font-size: clamp(2.4em, 8vw, 4.4em);
      box-shadow: 0 0 18px #fff3;
      letter-spacing: 0.04em;
      font-family: inherit;
      white-space: nowrap;
    }
    #hint {
      position: absolute;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      color: #fff;
      background: #222a;
      padding: 0.5em 1.5em;
      border-radius: 1em;
      font-size: 1.2em;
      z-index: 10;
      font-family: inherit;
      pointer-events: none;
      opacity: 0.85;
    }
  </style>
</head>
<body>
  <div id="hint">按 <b>空格键</b> 开始滚动，按住暂停，松开继续</div>
  <div id="container"></div>
  <script>
    const container = document.getElementById('container');
    const hint = document.getElementById('hint');
    let lines = [];
    let startIdx = 0;
    let visibleLines = 0;
    let scrollInterval = null;
    let autoplay = false;
    let scrolledCount = 0; // Track how many times we've scrolled
    let paused = false;

    function render() {
      container.innerHTML = '';
      for (let i = 0; i < visibleLines; i++) {
        let idx = (startIdx + i) % lines.length;
        const div = document.createElement('div');
        div.className = 'line';
        div.textContent = lines[idx];
        if (i === Math.floor(visibleLines / 2)) {
          div.classList.add('highlight');
        }
        container.appendChild(div);
      }
    }

    function startScroll() {
      if (scrollInterval) clearInterval(scrollInterval);
      scrolledCount = 0;
      scrollInterval = setInterval(() => {
        if (paused) return;
        startIdx = (startIdx + 1) % lines.length;
        scrolledCount++;
        render();
        // Stop after every line has been highlighted in the middle once
        if (scrolledCount >= lines.length) {
          clearInterval(scrollInterval);
        }
      }, 500); // Adjust speed here
    }

    function setupVisibleLines() {
      // Calculate how many lines fit in the full screen
      const lineHeight = 1.5 * parseFloat(getComputedStyle(document.documentElement).fontSize) * 2.2; // 2.2em base
      visibleLines = Math.floor(window.innerHeight / lineHeight);
    }

    function loadDefaultFile() {
      fetch('list.txt')
        .then(response => response.text())
        .then(text => {
          lines = text.split(/\r?\n/);
          setupVisibleLines();
          // Start from the middle line, showing the bottom half
          startIdx = Math.floor(lines.length / 2) - Math.floor(visibleLines / 2);
          if (startIdx < 0) startIdx = 0;
          render();
        });
    }

    window.addEventListener('resize', () => {
      if (!lines.length) return;
      setupVisibleLines();
      render();
    });

    // Spacebar: start, pause on keydown, resume on keyup
    document.addEventListener('keydown', (e) => {
      if (e.code === 'Space') {
        if (!autoplay) {
          autoplay = true;
          hint.style.display = 'none';
          startScroll();
        } else {
          paused = true;
        }
        e.preventDefault();
      }
    });
    document.addEventListener('keyup', (e) => {
      if (e.code === 'Space') {
        paused = false;
        e.preventDefault();
      }
    });

    // Auto-load default file
    loadDefaultFile();
  </script>
</body>
</html>