refactor(ui): optimize smart input animation (#3176)

Co-authored-by: simeng-li <simeng@silverhand.io>

packages/ui/package.json

@@ -27,6 +27,7 @@
     "@parcel/transformer-sass": "2.8.3",
     "@parcel/transformer-svg-react": "2.8.3",
     "@peculiar/webcrypto": "^1.3.3",
+    "@react-spring/shared": "^9.6.1",
     "@react-spring/web": "^9.6.1",
     "@silverhand/eslint-config": "2.0.1",
     "@silverhand/eslint-config-react": "2.0.1",

packages/ui/src/components/InputFields/InputField/index.module.scss

@@ -18,7 +18,7 @@
     transition: width 0.3s ease-in;
     padding: 0 _.unit(4);
     flex: 1;
-    background: none;
+    background: var(--color-bg-body);
     caret-color: var(--color-brand-default);
     font: var(--font-body-1);
     color: var(--color-type-primary);
@@ -55,12 +55,6 @@
     }
   }
 
-  &.isPrefixVisible {
-    input {
-      padding-left: _.unit(1);
-    }
-  }
-
   &.isSuffixVisible,
   &.isSuffixFocusVisible:focus-within {
     input {
@@ -85,6 +79,7 @@
     /* stylelint-disable-next-line no-descending-specificity */
     input {
       font: var(--font-body-2);
+      background: var(--color-bg-float);
     }
 
     &:focus-within {

packages/ui/src/components/InputFields/InputField/index.tsx

@@ -11,7 +11,6 @@ export type Props = Omit<HTMLProps<HTMLInputElement>, 'prefix'> & {
   errorMessage?: string;
   isDanger?: boolean;
   prefix?: ReactElement;
-  isPrefixVisible?: boolean;
   suffix?: ReactElement;
   isSuffixVisible?: boolean;
   isSuffixFocusVisible?: boolean;
@@ -24,7 +23,6 @@ const InputField = (
     isDanger,
     prefix,
     suffix,
-    isPrefixVisible,
     isSuffixFocusVisible,
     isSuffixVisible,
     ...props
@@ -36,7 +34,6 @@ const InputField = (
       className={classNames(
         styles.inputField,
         isDanger && styles.danger,
-        isPrefixVisible && styles.isPrefixVisible,
         isSuffixFocusVisible && styles.isSuffixFocusVisible,
         isSuffixVisible && styles.isSuffixVisible
       )}

packages/ui/src/components/InputFields/SmartInputField/AnimatedPrefix/index.module.scss

@@ -1,3 +1,7 @@
 .prefix {
   overflow: hidden;
+
+  > div {
+    position: absolute;
+  }
 }

packages/ui/src/components/InputFields/SmartInputField/AnimatedPrefix/index.tsx

@@ -1,38 +1,50 @@
-import { useSpring, animated } from '@react-spring/web';
+import { onResize, useIsomorphicLayoutEffect } from '@react-spring/shared';
-import { useState } from 'react';
+import { useSpring, animated, config } from '@react-spring/web';
+import type { Nullable } from '@silverhand/essentials';
+import { cloneElement, useCallback, useRef } from 'react';
 
 import * as styles from './index.module.scss';
 
 type Props = {
-  children: React.ReactNode;
+  children: JSX.Element; // Limit to one element
   isVisible: boolean;
 };
 
 const AnimatedPrefix = ({ children, isVisible }: Props) => {
-  const [show, setShow] = useState(isVisible);
+  const elementRef = useRef<Nullable<HTMLElement>>(null);
 
-  const [animation] = useSpring(
+  // Get target width for the children
-    () => ({
+  const getTargetWidth = useCallback(
-      from: { maxWidth: isVisible ? 0 : 100 },
+    () => (isVisible ? elementRef.current?.getBoundingClientRect().width : 0),
-      to: { maxWidth: isVisible ? 100 : 0 },
-      config: { duration: 200 },
-      onStart: () => {
-        if (isVisible) {
-          setShow(true);
-        }
-      },
-      onResolve: () => {
-        if (!isVisible) {
-          setShow(false);
-        }
-      },
-    }),
     [isVisible]
   );
 
+  const [animation, api] = useSpring(
+    () => ({ width: getTargetWidth(), config: { ...config.default, clamp: true } }),
+    [getTargetWidth]
+  );
+
+  useIsomorphicLayoutEffect(() => {
+    const { current } = elementRef;
+    const cleanup =
+      current &&
+      onResize(
+        () => {
+          api.start({ width: getTargetWidth() });
+        },
+        { container: current }
+      );
+
+    return () => {
+      // Stop animation before cleanup
+      api.stop();
+      cleanup?.();
+    };
+  }, [api, getTargetWidth]);
+
   return (
-    <animated.div className={styles.prefix} style={animation}>
+    <animated.div className={styles.prefix} style={animation} data-testid="prefix">
-      {show && children}
+      {cloneElement(children, { ref: elementRef })}
     </animated.div>
   );
 };

packages/ui/src/components/InputFields/SmartInputField/CountryCodeSelector/index.module.scss

@@ -14,11 +14,14 @@
   white-space: nowrap;
 
   > select {
+    flex-shrink: 0;
     appearance: none;
     border: none;
     outline: none;
     background: none;
     position: absolute;
+    left: 0;
+    top: 0;
     width: 100%;
     height: 100%;
     font-size: 0;
@@ -29,6 +32,7 @@
   }
 
   > svg {
+    flex-shrink: 0;
     color: var(--color-type-secondary);
     margin-left: _.unit(1);
     width: 16px;

packages/ui/src/components/InputFields/SmartInputField/index.test.tsx

@@ -1,4 +1,5 @@
 import { SignInIdentifier } from '@logto/schemas';
+import { Globals } from '@react-spring/web';
 import { assert } from '@silverhand/essentials';
 import { fireEvent, render } from '@testing-library/react';
 
@@ -22,6 +23,12 @@ describe('SmartInputField Component', () => {
     enabledTypes?: IdentifierInputType[];
   }) => render(<SmartInputField {...props} onChange={onChange} />);
 
+  beforeAll(() => {
+    Globals.assign({
+      skipAnimation: true,
+    });
+  });
+
   afterEach(() => {
     jest.clearAllMocks();
   });
@@ -29,11 +36,11 @@ describe('SmartInputField Component', () => {
   describe('standard input field', () => {
     test.each([SignInIdentifier.Username, SignInIdentifier.Email])(
       `should render %s input field`,
-      (currentType) => {
+      async (currentType) => {
-        const { container } = renderInputField({ enabledTypes: [currentType] });
+        const { container, queryByTestId } = renderInputField({ enabledTypes: [currentType] });
 
-        // Country code should not be rendered
+        // Country code select should have a 0 width
-        expect(container.querySelector('select')).toBeNull();
+        expect(queryByTestId('prefix')?.style.width).toBe('0px');
 
         const input = container.querySelector('input');
 
@@ -51,35 +58,37 @@ describe('SmartInputField Component', () => {
     );
 
     test('phone', async () => {
-      const { container, queryAllByText } = renderInputField({
+      const { container, queryAllByText, queryByTestId } = renderInputField({
         enabledTypes: [SignInIdentifier.Phone],
       });
 
       const countryCode = queryAllByText(`+${defaultCountryCallingCode}`);
       expect(countryCode).toHaveLength(2);
 
+      // Country code select should have a >0 width.
+      // The React Spring acquires the child element's width ahead of elementRef is properly set.
+      // So the value returns null. Assert style is null to represent the width is >0.
+      expect(queryByTestId('prefix')?.getAttribute('style')).toBe(null);
+
       const selector = container.querySelector('select');
-      expect(selector).not.toBeNull();
+      assert(selector, new Error('selector should not be null'));
 
       const newCountryCode = '86';
 
-      if (selector) {
       fireEvent.change(selector, { target: { value: newCountryCode } });
       expect(onChange).toBeCalledWith({
         type: SignInIdentifier.Phone,
         value: '',
       });
-      }
 
       const input = container.querySelector('input');
+      assert(input, new Error('input should not be null'));
 
-      if (input) {
       fireEvent.change(input, { target: { value: '12315' } });
       expect(onChange).toBeCalledWith({
         type: SignInIdentifier.Phone,
         value: `${newCountryCode}12315`,
       });
-      }
     });
   });
 
@@ -88,11 +97,11 @@ describe('SmartInputField Component', () => {
       enabledTypes: [SignInIdentifier.Email, SignInIdentifier.Username],
     };
 
-    test('should  return username type if no @ char present', () => {
+    test('should  return username type if no @ char present', async () => {
-      const { container } = renderInputField(config);
+      const { container, queryByTestId } = renderInputField(config);
 
-      // Country code should not be rendered
+      // Country code select should have a 0 width
-      expect(container.querySelector('select')).toBeNull();
+      expect(queryByTestId('prefix')?.style.width).toBe('0px');
 
       const input = container.querySelector('input');
 
@@ -102,11 +111,11 @@ describe('SmartInputField Component', () => {
       }
     });
 
-    test('should return username type with all digits input', () => {
+    test('should return username type with all digits input', async () => {
-      const { container } = renderInputField(config);
+      const { container, queryByTestId } = renderInputField(config);
 
-      // Country code should not be rendered
+      // Country code select should have a 0 width
-      expect(container.querySelector('select')).toBeNull();
+      expect(queryByTestId('prefix')?.style.width).toBe('0px');
 
       const input = container.querySelector('input');
 
@@ -116,11 +125,11 @@ describe('SmartInputField Component', () => {
       }
     });
 
-    test('should return email type with @ char', () => {
+    test('should return email type with @ char', async () => {
-      const { container } = renderInputField(config);
+      const { container, queryByTestId } = renderInputField(config);
 
-      // Country code should not be rendered
+      // Country code select should have a 0 width
-      expect(container.querySelector('select')).toBeNull();
+      expect(queryByTestId('prefix')?.style.width).toBe('0px');
 
       const input = container.querySelector('input');
 

packages/ui/src/components/InputFields/SmartInputField/index.tsx

@@ -1,6 +1,6 @@
 import { SignInIdentifier } from '@logto/schemas';
+import { animated, config, useSpring } from '@react-spring/web';
 import type { Nullable } from '@silverhand/essentials';
-import { conditional } from '@silverhand/essentials';
 import type { HTMLProps, Ref } from 'react';
 import { useEffect, useImperativeHandle, useRef, forwardRef } from 'react';
 
@@ -28,6 +28,8 @@ type Props = Omit<HTMLProps<HTMLInputElement>, 'onChange' | 'prefix' | 'value'>
   onChange?: (data: IdentifierInputValue) => void;
 };
 
+const AnimatedInputField = animated(InputField);
+
 const SmartInputField = (
   { defaultValue, defaultType, enabledTypes = [], onChange, ...rest }: Props,
   ref: Ref<Nullable<HTMLInputElement>>
@@ -48,29 +50,29 @@ const SmartInputField = (
     enabledTypes,
   });
 
-  const isPhoneEnabled = enabledTypes.includes(SignInIdentifier.Phone);
+  const isPrefixVisible = identifierType === SignInIdentifier.Phone;
+  const { paddingLeft } = useSpring({
+    paddingLeft: isPrefixVisible ? 4 : 16,
+    config: { ...config.default, clamp: true },
+  });
 
   useEffect(() => {
     onChange?.({
       type: identifierType,
-      value:
+      value: isPrefixVisible && inputValue ? `${countryCode}${inputValue}` : inputValue,
-        identifierType === SignInIdentifier.Phone && inputValue
-          ? `${countryCode}${inputValue}`
-          : inputValue,
     });
-  }, [countryCode, identifierType, inputValue, onChange]);
+  }, [countryCode, identifierType, inputValue, isPrefixVisible, onChange]);
 
   return (
-    <InputField
+    <AnimatedInputField
-      {...getInputHtmlProps(enabledTypes, identifierType)}
       {...rest}
+      {...getInputHtmlProps(enabledTypes, identifierType)}
       ref={innerRef}
       isSuffixFocusVisible={Boolean(inputValue)}
-      isPrefixVisible={identifierType === SignInIdentifier.Phone}
+      style={{ zIndex: 1, paddingLeft }} // Give <input /> z-index to override country selector
       value={inputValue}
-      prefix={conditional(
+      prefix={
-        isPhoneEnabled && (
+        <AnimatedPrefix isVisible={isPrefixVisible}>
-          <AnimatedPrefix isVisible={identifierType === SignInIdentifier.Phone}>
           <CountryCodeSelector
             value={countryCode}
             onChange={(event) => {
@@ -79,8 +81,7 @@ const SmartInputField = (
             }}
           />
         </AnimatedPrefix>
-        )
+      }
-      )}
       suffix={
         <IconButton
           onMouseDown={(event) => {

packages/ui/src/pages/ForgotPassword/index.test.tsx

@@ -1,4 +1,5 @@
 import { SignInIdentifier } from '@logto/schemas';
+import { Globals } from '@react-spring/web';
 import { assert } from '@silverhand/essentials';
 import { MemoryRouter, useLocation } from 'react-router-dom';
 
@@ -38,6 +39,12 @@ describe('ForgotPassword', () => {
       </MemoryRouter>
     );
 
+  beforeAll(() => {
+    Globals.assign({
+      skipAnimation: true,
+    });
+  });
+
   afterEach(() => {
     jest.clearAllMocks();
   });
@@ -69,9 +76,9 @@ describe('ForgotPassword', () => {
     test.each(stateCases)('render the forgot password page with state %o', async (state) => {
       mockUseLocation.mockImplementation(() => ({ state }));
 
-      const { queryByText, queryAllByText, container } = renderPage(settings);
+      const { queryByText, queryAllByText, container, queryByTestId } = renderPage(settings);
       const inputField = container.querySelector('input[name="identifier"]');
-      const countryCodeSelector = container.querySelector('select[name="countryCode"]');
+      const countryCodeSelectorPrefix = queryByTestId('prefix');
       assert(inputField, new Error('input field not found'));
 
       expect(queryByText('description.reset_password')).not.toBeNull();
@@ -81,27 +88,35 @@ describe('ForgotPassword', () => {
 
       if (state.identifier === SignInIdentifier.Phone && settings.phone) {
         expect(inputField.getAttribute('value')).toBe(phone);
-        expect(countryCodeSelector).not.toBeNull();
+
+        // Country code select should have a >0 width.
+        // The React Spring acquires the child element's width ahead of elementRef is properly set.
+        // So the value returns null. Assert style is null to represent the width is >0.
+        expect(countryCodeSelectorPrefix?.getAttribute('style')).toBeNull();
+
         expect(queryAllByText(`+${countryCode}`)).toHaveLength(2);
       } else if (state.identifier === SignInIdentifier.Phone) {
+        // Phone Number not enabled
         expect(inputField.getAttribute('value')).toBe('');
-        expect(countryCodeSelector).toBeNull();
+        expect(countryCodeSelectorPrefix?.style.width).toBe('0px');
       }
 
       if (state.identifier === SignInIdentifier.Email && settings.email) {
         expect(inputField.getAttribute('value')).toBe(email);
-        expect(countryCodeSelector).toBeNull();
+        expect(countryCodeSelectorPrefix?.style.width).toBe('0px');
       } else if (state.identifier === SignInIdentifier.Email) {
+        // Only PhoneNumber is enabled
         expect(inputField.getAttribute('value')).toBe('');
-        expect(countryCodeSelector).not.toBeNull();
+        expect(countryCodeSelectorPrefix?.getAttribute('style')).toBeNull();
       }
 
       if (state.identifier === SignInIdentifier.Username && settings.email) {
         expect(inputField.getAttribute('value')).toBe('');
-        expect(countryCodeSelector).toBeNull();
+        expect(countryCodeSelectorPrefix?.style.width).toBe('0px');
       } else if (state.identifier === SignInIdentifier.Username) {
+        // Only PhoneNumber is enabled
         expect(inputField.getAttribute('value')).toBe('');
-        expect(countryCodeSelector).not.toBeNull();
+        expect(countryCodeSelectorPrefix?.getAttribute('style')).toBeNull();
       }
     });
   });

pnpm-lock.yaml

@@ -848,6 +848,7 @@ importers:
       '@parcel/transformer-sass': 2.8.3
       '@parcel/transformer-svg-react': 2.8.3
       '@peculiar/webcrypto': ^1.3.3
+      '@react-spring/shared': ^9.6.1
       '@react-spring/web': ^9.6.1
       '@silverhand/eslint-config': 2.0.1
       '@silverhand/eslint-config-react': 2.0.1
@@ -905,6 +906,7 @@ importers:
       '@parcel/transformer-sass': 2.8.3_@parcel+core@2.8.3
       '@parcel/transformer-svg-react': 2.8.3_@parcel+core@2.8.3
       '@peculiar/webcrypto': 1.3.3
+      '@react-spring/shared': 9.6.1_react@18.2.0
       '@react-spring/web': 9.6.1_biqbaboplfbrettd7655fr4n2y
       '@silverhand/eslint-config': 2.0.1_kjzxg5porcw5dx54sezsklj5cy
       '@silverhand/eslint-config-react': 2.0.1_kz2ighe3mj4zdkvq5whtl3dq4u