React 공부하기(2)

💖 벨로퍼트와 함께하는 모던 리액트

Syntactically Awesome Style Sheets !

확장자 : .scss / .sass

$ yarn add sass

sass

$font-stack:    Helvetica, sans-serif
$primary-color: #333

body
  font: 100% $font-stack
  color: $primary-color

scss

$font-stack:    Helvetica, sans-serif;
$primary-color: #333;

body {
  font: 100% $font-stack;
  color: $primary-color;
}

[classnames]

$ yarn add classnames

import classNames from 'classnames';

import React from 'react';
import classNames from 'classnames';
import './Button.scss';

function Button({ children, size, color, outline, fullWidth }) {
  return (
  	// outline, fullwidth = true 일 때만 css class 적용
    <button
      className={classNames('Button', size, color, { outline, fullWidth })}
    >
      {children}
    </button>
  );
}

Button.defaultProps = {
  size: 'medium',
  color: 'blue'
};

export default Button;

$blue: #228be6;
$gray: #495057;
$pink: #f06595;

@mixin button-color($color) {
  background: $color;
  &:hover {
    background: lighten($color, 10%);
  }
  &:active {
    background: darken($color, 10%);
  }
  &.outline {
    color: $color;
    background: none;
    border: 1px solid $color;
    &:hover {
      background: $color;
      color: white;
    }
  }
}

.Button {
  display: inline-flex;
  color: white;
  font-weight: bold;
  outline: none;
  border-radius: 4px;
  border: none;
  cursor: pointer;

  // 사이즈 관리
  &.large {
    height: 3rem;
    padding-left: 1rem;
    padding-right: 1rem;
    font-size: 1.25rem;
  }

  &.medium {
    height: 2.25rem;
    padding-left: 1rem;
    padding-right: 1rem;
    font-size: 1rem;
  }

  &.small {
    height: 1.75rem;
    font-size: 0.875rem;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  // 색상 관리
  &.blue {
    @include button-color($blue);
  }

  &.gray {
    @include button-color($gray);
  }

  &.pink {
    @include button-color($pink);
  }

  & + & {
    margin-left: 1rem;
  }

  &.fullWidth {
    width: 100%;
    justify-content: center;
    & + & {
      margin-left: 0;
      margin-top: 1rem;
    }
  }
}

[mixin]

* mixin 사용 안 할 시

$blue: #228be6;
$gray: #495057;
$pink: #f06595;

.Button {
  display: inline-flex;
  color: white;
  font-weight: bold;
  outline: none;
  border-radius: 4px;
  border: none;
  cursor: pointer;

  // 사이즈 관리
  &.large {
    height: 3rem;
    padding-left: 1rem;
    padding-right: 1rem;
    font-size: 1.25rem;
  }

  &.medium {
    height: 2.25rem;
    padding-left: 1rem;
    padding-right: 1rem;
    font-size: 1rem;
  }

  &.small {
    height: 1.75rem;
    font-size: 0.875rem;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  // 색상 관리
  &.blue {
    background: $blue;
    &:hover {
      background: lighten($blue, 10%);
    }

    &:active {
      background: darken($blue, 10%);
    }
  }

  &.gray {
    background: $gray;
    &:hover {
      background: lighten($gray, 10%);
    }

    &:active {
      background: darken($gray, 10%);
    }
  }

  &.pink {
    background: $pink;
    &:hover {
      background: lighten($pink, 10%);
    }

    &:active {
      background: darken($pink, 10%);
    }
  }

  & + & {
    margin-left: 1rem;
  }
}

* mixin 사용할 시

$blue: #228be6;
$gray: #495057;
$pink: #f06595;

@mixin button-color($color) {
  background: $color;
  &:hover {
    background: lighten($color, 10%);
  }
  &:active {
    background: darken($color, 10%);
  }
}

.Button {
  display: inline-flex;
  color: white;
  font-weight: bold;
  outline: none;
  border-radius: 4px;
  border: none;
  cursor: pointer;

  // 사이즈 관리
  &.large {
    height: 3rem;
    padding-left: 1rem;
    padding-right: 1rem;
    font-size: 1.25rem;
  }

  &.medium {
    height: 2.25rem;
    padding-left: 1rem;
    padding-right: 1rem;
    font-size: 1rem;
  }

  &.small {
    height: 1.75rem;
    font-size: 0.875rem;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  // 색상 관리
  &.blue {
    @include button-color($blue);
  }

  &.gray {
    @include button-color($gray);
  }

  &.pink {
    @include button-color($pink);
  }

  & + & {
    margin-left: 1rem;
  }
}

<App.js>

import React from 'react';
import './App.scss';
import Button from './components/Button';

function App() {
  return (
    <div className="App">
      <div className="buttons">
        <Button size="large">BUTTON</Button>
        <Button>BUTTON</Button>
        <Button size="small">BUTTON</Button>
      </div>
      <div className="buttons">
        <Button size="large" color="gray">
          BUTTON
        </Button>
        <Button color="gray">BUTTON</Button>
        <Button size="small" color="gray">
          BUTTON
        </Button>
      </div>
      <div className="buttons">
        <Button size="large" color="pink">
          BUTTON
        </Button>
        <Button color="pink">BUTTON</Button>
        <Button size="small" color="pink">
          BUTTON
        </Button>
      </div>
      <div className="buttons">
        <Button size="large" color="blue" outline>
          BUTTON
        </Button>
        <Button color="gray" outline>
          BUTTON
        </Button>
        <Button size="small" color="pink" outline>
          BUTTON
        </Button>
      </div>
      <div className="buttons">
        <Button size="large" fullWidth>
          BUTTON
        </Button>
        <Button size="large" fullWidth color="gray">
          BUTTON
        </Button>
        <Button size="large" fullWidth color="pink">
          BUTTON
        </Button>
      </div>
    </div>
  );
}

export default App;

<App.scss>

.App {
  width: 512px;
  margin: 0 auto;
  margin-top: 4rem;
  border: 1px solid black;
  padding: 1rem;
  .buttons + .buttons {
    margin-top: 1rem;
  }
}

[...rest props 전달하기] onClick

* ...rest 사용 안 할 시

import React from 'react';
import classNames from 'classnames';
import './Button.scss';

function Button({ children, size, color, outline, fullWidth, onClick, onMouseMove }) {
  return (
    <button
      className={classNames('Button', size, color, { outline, fullWidth })}
      onClick={onClick}
      onMouseMove={onMouseMove}
    >
      {children}
    </button>
  );
}

Button.defaultProps = {
  size: 'medium',
  color: 'blue'
};

export default Button;

* ...rest 사용할 시

import React from 'react';
import classNames from 'classnames';
import './Button.scss';

function Button({ children, size, color, outline, fullWidth, ...rest }) {
  return (
    <button
      className={classNames('Button', size, color, { outline, fullWidth })}
      {...rest}
    >
      {children}
    </button>
  );
}

Button.defaultProps = {
  size: 'medium',
  color: 'blue'
};

export default Button;

...rest : 지정한 props를 제외한 값들을 rest 객체에 모아준다. =>이벤트 일일이 안 넘겨줘도 됨!

<App.js>

import React from 'react';
import './App.scss';
import Button from './components/Button';

function App() {
  return (
    <div className="App">
      <div className="buttons">
        <Button size="large" onClick={() => console.log('클릭됐다!')}>
          BUTTON
        </Button>
        <Button>BUTTON</Button>
        <Button size="small">BUTTON</Button>
      </div>
      <div className="buttons">
        <Button size="large" color="gray">
          BUTTON
        </Button>
        <Button color="gray">BUTTON</Button>
        <Button size="small" color="gray">
          BUTTON
        </Button>
      </div>
      <div className="buttons">
        <Button size="large" color="pink">
          BUTTON
        </Button>
        <Button color="pink">BUTTON</Button>
        <Button size="small" color="pink">
          BUTTON
        </Button>
      </div>
      <div className="buttons">
        <Button size="large" color="blue" outline>
          BUTTON
        </Button>
        <Button color="gray" outline>
          BUTTON
        </Button>
        <Button size="small" color="pink" outline>
          BUTTON
        </Button>
      </div>
      <div className="buttons">
        <Button size="large" fullWidth>
          BUTTON
        </Button>
        <Button size="large" color="gray" fullWidth>
          BUTTON
        </Button>
        <Button size="large" color="pink" fullWidth>
          BUTTON
        </Button>
      </div>
    </div>
  );
}

export default App;

👩‍💻 Hong Yujin

React 공부하기(2) - Sass

[classnames]

[mixin]

[...rest props 전달하기] onClick

티스토리툴바