Double Click Drag Zoom

<!--
  示例：双击拖拽缩放
  核心逻辑：移除 DoubleClickZoom，dblclick 记录起点，pointerdrag 按垂直位移设置缩放
  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>双击拖拽缩放</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:12px;align-items:center;font-size:12px;color:#58606e;flex-wrap:wrap}
  #info{margin-left:auto}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>双击后按住并上下拖动</span>
  <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 fromLonLat = ol.proj.fromLonLat;

  var view = new ol.View({ center: fromLonLat([116.391, 39.907]), zoom: 10, minZoom: 2, maxZoom: 19 });

  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: view,
    controls: ol.control.defaults.defaults({ attribution: false, rotate: false })
  });

  map.getInteractions().slice().forEach(function (interaction) {
    if (interaction instanceof ol.interaction.DoubleClickZoom) {
      map.removeInteraction(interaction);
    }
  });

  var info = document.getElementById('info');
  var armed = false;
  var startPixel = null;
  var startZoom = 0;

  map.on('dblclick', function (evt) {
    armed = true;
    startPixel = evt.pixel;
    startZoom = view.getZoom();
    info.textContent = '已进入拖拽缩放，当前 ' + startZoom.toFixed(2) + ' 级';
  });

  map.on('pointerdrag', function (evt) {
    if (!armed || !startPixel) return;
    var dy = evt.pixel[1] - startPixel[1];
    var z = startZoom - dy / 60;
    view.setZoom(z);
    info.textContent = '缩放 ' + view.getZoom().toFixed(2) + ' 级（位移 ' + Math.round(-dy) + ' px）';
  });

  map.on('pointerup', function () {
    armed = false;
    startPixel = null;
  });
})();
</script>
</body>
</html>