tdesign-mobile-vue/lib/hooks/useResizeObserver.js

tdesign-mobile-vue

/**
 * tdesign v1.15.0
 * (c) 2026 TDesign Group
 * @license MIT
 */

import _typeof from '@babel/runtime/helpers/typeof';
import { ref, watch, unref, onMounted, onUnmounted } from 'vue';

function _createForOfIteratorHelper(r, e) { var t = "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (!t) { if (Array.isArray(r) || (t = _unsupportedIterableToArray(r)) || e && r && "number" == typeof r.length) { t && (r = t); var _n = 0, F = function F() {}; return { s: F, n: function n() { return _n >= r.length ? { done: !0 } : { done: !1, value: r[_n++] }; }, e: function e(r) { throw r; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var o, a = !0, u = !1; return { s: function s() { t = t.call(r); }, n: function n() { var r = t.next(); return a = r.done, r; }, e: function e(r) { u = !0, o = r; }, f: function f() { try { a || null == t.return || t.return(); } finally { if (u) throw o; } } }; }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
function useResizeObserver(target, callback) {
  var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  var _options$onVisibility = options.onVisibilityChange,
    onVisibilityChange = _options$onVisibility === void 0 ? false : _options$onVisibility,
    _options$onResize = options.onResize,
    onResize = _options$onResize === void 0 ? true : _options$onResize,
    _options$immediate = options.immediate,
    immediate = _options$immediate === void 0 ? true : _options$immediate;
  var isSupported = typeof ResizeObserver !== "undefined";
  var previousSize = ref({
    width: 0,
    height: 0
  });
  var observer = null;
  var cleanup = function cleanup() {
    if (observer) {
      observer.disconnect();
      observer = null;
    }
  };
  var observe = function observe() {
    cleanup();
    var element = unref(target);
    if (!element || !isSupported) return;
    previousSize.value = {
      width: element.offsetWidth || 0,
      height: element.offsetHeight || 0
    };
    observer = new ResizeObserver(function (entries) {
      var _iterator = _createForOfIteratorHelper(entries),
        _step;
      try {
        for (_iterator.s(); !(_step = _iterator.n()).done;) {
          var entry = _step.value;
          var _entry$contentRect = entry.contentRect,
            width = _entry$contentRect.width,
            height = _entry$contentRect.height;
          var _previousSize$value = previousSize.value,
            prevWidth = _previousSize$value.width,
            prevHeight = _previousSize$value.height;
          var wasHidden = prevWidth === 0 || prevHeight === 0;
          var isVisible = width > 0 && height > 0;
          var becameVisible = wasHidden && isVisible;
          var sizeChanged = width !== prevWidth || height !== prevHeight;
          previousSize.value = {
            width: width,
            height: height
          };
          var shouldTrigger = onVisibilityChange && becameVisible || onResize && sizeChanged && !becameVisible;
          if (shouldTrigger) {
            callback({
              width: width,
              height: height,
              entry: entry,
              becameVisible: becameVisible
            });
          }
        }
      } catch (err) {
        _iterator.e(err);
      } finally {
        _iterator.f();
      }
    });
    observer.observe(element);
  };
  if (_typeof(target) === "object" && target !== null && "value" in target) {
    watch(function () {
      return unref(target);
    }, function (newEl, oldEl) {
      if (newEl !== oldEl) {
        observe();
      }
    }, {
      flush: "post"
    });
  }
  onMounted(function () {
    if (immediate) {
      observe();
    }
  });
  onUnmounted(function () {
    cleanup();
  });
  return {
    isSupported: isSupported,
    stop: cleanup,
    start: observe
  };
}
function useVisibilityObserver(target, callback) {
  return useResizeObserver(target, function (_ref) {
    var becameVisible = _ref.becameVisible;
    if (becameVisible) {
      callback();
    }
  }, {
    onVisibilityChange: true,
    onResize: false
  });
}

export { useResizeObserver as default, useResizeObserver, useVisibilityObserver };
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