Full Screen

<!--
  示例：全屏控件 — OpenLayers full-screen
  核心逻辑：ol.control.FullScreen 接管容器全屏，事件回调同步按钮文案与状态
  依赖：OpenLayers 10.3.1 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>全屏控件</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@10.3.1/ol.css">
<style>
  html,body{height:100%;margin:0}
  body{display:flex;flex-direction:column;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  .bar{flex:0 0 auto;padding:8px 12px;background:#f6f7f9;border-bottom:1px solid #e3e6ea;
       display:flex;gap:10px;align-items:center;font-size:12px;color:#58606e}
  .bar button{font:inherit;padding:3px 9px;border:1px solid #ccd2da;background:#fff;
       border-radius:3px;cursor:pointer;color:#2b3140}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <button id="fsBtn">进入全屏</button>
  <span id="info">—</span>
</div>
<div id="map"></div>
<script src="https://cdn.jsdelivr.net/npm/ol@10.3.1/dist/ol.js"></script>
<script>
(function () {
  'use strict';

  if (typeof ol === 'undefined') {
    document.getElementById('map').innerHTML =
      '<div style="padding:20px;color:#b42318">OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  var infoEl = document.getElementById('info');
  var fsBtn = document.getElementById('fsBtn');

  var map = new ol.Map({
    target: 'map',
    layers: [
      new ol.layer.Tile({ source: new ol.source.XYZ({url: 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}', attributions: 'Tiles © Esri'}) })
    ],
    view: new ol.View({
      center: ol.proj.fromLonLat([116.391, 39.907]),
      zoom: 12,
      minZoom: 2
    }),
    controls: ol.control.defaults.defaults({ attribution: false }).extend([
      /* source 不指定时作用于地图容器，地图随窗口尺寸自动重算 */
      new ol.control.FullScreen({
        className: 'ol-full-screen',
        label: '\u26F6',
        tipLabel: '全屏'
      })
    ])
  });

  var fsControl = map.getControls().getArray().filter(function (c) {
    return c instanceof ol.control.FullScreen;
  })[0];

  var active = false;

  function sync() {
    fsBtn.textContent = active ? '退出全屏' : '进入全屏';
    infoEl.textContent = active
      ? '已全屏，按 Esc 也可退出'
      : '当前为窗口模式 · 画布 ' + map.getSize().join(' × ');
  }

  fsBtn.addEventListener('click', function () {
    active = !active;
    fsControl.setActive(active);
    sync();
  });

  document.addEventListener('fullscreenchange', function () {
    active = !!document.fullscreenElement;
    sync();
  });

  map.on('change:size', sync);
  sync();
})();
</script>
</body>
</html>