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frontend/node_modules/antd/es/_util/motion.js

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+import { defaultPrefixCls } from '../config-provider';
+// ================== Collapse Motion ==================
+const getCollapsedHeight = () => ({
+  height: 0,
+  opacity: 0
+});
+const getRealHeight = node => {
+  const {
+    scrollHeight
+  } = node;
+  return {
+    height: scrollHeight,
+    opacity: 1
+  };
+};
+const getCurrentHeight = node => ({
+  height: node ? node.offsetHeight : 0
+});
+const skipOpacityTransition = (_, event) => (event === null || event === void 0 ? void 0 : event.deadline) === true || event.propertyName === 'height';
+const initCollapseMotion = (rootCls = defaultPrefixCls) => ({
+  motionName: `${rootCls}-motion-collapse`,
+  onAppearStart: getCollapsedHeight,
+  onEnterStart: getCollapsedHeight,
+  onAppearActive: getRealHeight,
+  onEnterActive: getRealHeight,
+  onLeaveStart: getCurrentHeight,
+  onLeaveActive: getCollapsedHeight,
+  onAppearEnd: skipOpacityTransition,
+  onEnterEnd: skipOpacityTransition,
+  onLeaveEnd: skipOpacityTransition,
+  motionDeadline: 500
+});
+const _SelectPlacements = ['bottomLeft', 'bottomRight', 'topLeft', 'topRight'];
+const getTransitionName = (rootPrefixCls, motion, transitionName) => {
+  if (transitionName !== undefined) {
+    return transitionName;
+  }
+  return `${rootPrefixCls}-${motion}`;
+};
+export { getTransitionName };
+export default initCollapseMotion;