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frontend/node_modules/@rc-component/tour/es/hooks/useTarget.js

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+import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
+import useEvent from "rc-util/es/hooks/useEvent";
+import useLayoutEffect from "rc-util/es/hooks/useLayoutEffect";
+import { useMemo, useState } from 'react';
+import { isInViewPort } from "../util";
+function isValidNumber(val) {
+  return typeof val === 'number' && !Number.isNaN(val);
+}
+export default function useTarget(target, open, gap, scrollIntoViewOptions) {
+  // ========================= Target =========================
+  // We trade `undefined` as not get target by function yet.
+  // `null` as empty target.
+  var _useState = useState(undefined),
+    _useState2 = _slicedToArray(_useState, 2),
+    targetElement = _useState2[0],
+    setTargetElement = _useState2[1];
+  useLayoutEffect(function () {
+    var nextElement = typeof target === 'function' ? target() : target;
+    setTargetElement(nextElement || null);
+  });
+
+  // ========================= Align ==========================
+  var _useState3 = useState(null),
+    _useState4 = _slicedToArray(_useState3, 2),
+    posInfo = _useState4[0],
+    setPosInfo = _useState4[1];
+  var updatePos = useEvent(function () {
+    if (targetElement) {
+      // Exist target element. We should scroll and get target position
+      if (!isInViewPort(targetElement) && open) {
+        targetElement.scrollIntoView(scrollIntoViewOptions);
+      }
+      var _targetElement$getBou = targetElement.getBoundingClientRect(),
+        left = _targetElement$getBou.left,
+        top = _targetElement$getBou.top,
+        width = _targetElement$getBou.width,
+        height = _targetElement$getBou.height;
+      var nextPosInfo = {
+        left: left,
+        top: top,
+        width: width,
+        height: height,
+        radius: 0
+      };
+      setPosInfo(function (origin) {
+        if (JSON.stringify(origin) !== JSON.stringify(nextPosInfo)) {
+          return nextPosInfo;
+        }
+        return origin;
+      });
+    } else {
+      // Not exist target which means we just show in center
+      setPosInfo(null);
+    }
+  });
+  var getGapOffset = function getGapOffset(index) {
+    var _ref;
+    return (_ref = Array.isArray(gap === null || gap === void 0 ? void 0 : gap.offset) ? gap === null || gap === void 0 ? void 0 : gap.offset[index] : gap === null || gap === void 0 ? void 0 : gap.offset) !== null && _ref !== void 0 ? _ref : 6;
+  };
+  useLayoutEffect(function () {
+    updatePos();
+    // update when window resize
+    window.addEventListener('resize', updatePos);
+    return function () {
+      window.removeEventListener('resize', updatePos);
+    };
+  }, [targetElement, open, updatePos]);
+
+  // ======================== PosInfo =========================
+  var mergedPosInfo = useMemo(function () {
+    if (!posInfo) {
+      return posInfo;
+    }
+    var gapOffsetX = getGapOffset(0);
+    var gapOffsetY = getGapOffset(1);
+    var gapRadius = isValidNumber(gap === null || gap === void 0 ? void 0 : gap.radius) ? gap === null || gap === void 0 ? void 0 : gap.radius : 2;
+    return {
+      left: posInfo.left - gapOffsetX,
+      top: posInfo.top - gapOffsetY,
+      width: posInfo.width + gapOffsetX * 2,
+      height: posInfo.height + gapOffsetY * 2,
+      radius: gapRadius
+    };
+  }, [posInfo, gap]);
+  return [mergedPosInfo, targetElement];
+}