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frontend/node_modules/antd/es/upload/style/motion.js

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+import { Keyframes } from '@ant-design/cssinjs';
+import { initFadeMotion } from '../../style/motion';
+// =========================== Motion ===========================
+const genMotionStyle = token => {
+  const {
+    componentCls
+  } = token;
+  const uploadAnimateInlineIn = new Keyframes('uploadAnimateInlineIn', {
+    from: {
+      width: 0,
+      height: 0,
+      padding: 0,
+      opacity: 0,
+      margin: token.calc(token.marginXS).div(-2).equal()
+    }
+  });
+  const uploadAnimateInlineOut = new Keyframes('uploadAnimateInlineOut', {
+    to: {
+      width: 0,
+      height: 0,
+      padding: 0,
+      opacity: 0,
+      margin: token.calc(token.marginXS).div(-2).equal()
+    }
+  });
+  const inlineCls = `${componentCls}-animate-inline`;
+  return [{
+    [`${componentCls}-wrapper`]: {
+      [`${inlineCls}-appear, ${inlineCls}-enter, ${inlineCls}-leave`]: {
+        animationDuration: token.motionDurationSlow,
+        animationTimingFunction: token.motionEaseInOutCirc,
+        animationFillMode: 'forwards'
+      },
+      [`${inlineCls}-appear, ${inlineCls}-enter`]: {
+        animationName: uploadAnimateInlineIn
+      },
+      [`${inlineCls}-leave`]: {
+        animationName: uploadAnimateInlineOut
+      }
+    }
+  }, {
+    [`${componentCls}-wrapper`]: initFadeMotion(token)
+  }, uploadAnimateInlineIn, uploadAnimateInlineOut];
+};
+export default genMotionStyle;