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<time class="post-full-meta-date" datetime=" 4 February 2020"> 4 February 2020</time>
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<a href='/category/react/'>REACT</a>
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<h1 class="post-full-title">React Component Styling</h1>
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<h3 id="1-css">1. CSS</h3>
<p>CSS는 HTML로 표현한 정보를 시각적으로 어떻게 보여지도록 하는지 기술하는 언어이다.
이는 정보와 디자인을 분리하여 관리하기 때문에 매우 유용하다.
그러나 프로젝트의 규모가 커진다면 일반적인 CSS로는 클래스명이 중첩될 가능성이 있다는 단점이 있다.</p>
<p>이번 글에서는 CSS의 다른 솔루션을 알아본다.</p>
<p>우선 CSS와 관련한 설정정보를 변경해 주어야한다 이는 프로젝트 생성하면 볼수 없도록 내부에 들어있다.
프로젝트를 생성 후 콘솔에서 명령어를 입력하여 밖으로 빼주어야 한다.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>yarn eject 또는 npm eject
</code></pre></div></div>
<p>적용이 완료되면 Webpack 설정을 변경해야 한다.</p>
<p>프로젝트 디렉토리 내에서 아래 파일에 ‘css-loader’를 찾아서 설정을 바꾸어 준다.</p>
<p>‘config/webpack.config.dev.js’</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="o">{</span>
<span class="nl">loader:</span> <span class="n">require</span><span class="o">.</span><span class="na">resolve</span><span class="o">(</span><span class="err">'</span><span class="n">css</span><span class="o">-</span><span class="n">lader</span><span class="err">'</span><span class="o">),</span>
<span class="nl">options:</span> <span class="o">{</span>
<span class="nl">importLoaders:</span> <span class="mi">1</span><span class="o">,</span>
<span class="nl">modules:</span> <span class="kc">true</span><span class="o">,</span>
<span class="nl">localIdentName:</span> <span class="err">'</span><span class="o">[</span><span class="n">name</span><span class="o">]</span><span class="n">__</span><span class="o">[</span><span class="n">local</span><span class="o">]</span><span class="n">___</span><span class="o">[</span><span class="nl">hash:base64:</span><span class="mi">5</span><span class="o">]</span><span class="err">'</span>
<span class="o">},</span>
<span class="o">},</span>
</code></pre></div></div>
<p>‘config/webpack.config.prod.js’</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="o">{</span>
<span class="nl">loader:</span> <span class="n">require</span><span class="o">.</span><span class="na">resolve</span><span class="o">(</span><span class="err">'</span><span class="n">css</span><span class="o">-</span><span class="n">lader</span><span class="err">'</span><span class="o">),</span>
<span class="nl">options:</span> <span class="o">{</span>
<span class="nl">importLoaders:</span> <span class="mi">1</span><span class="o">,</span>
<span class="nl">modules:</span> <span class="kc">true</span><span class="o">,</span>
<span class="nl">localIdentName:</span> <span class="err">'</span><span class="o">[</span><span class="n">name</span><span class="o">]</span><span class="n">__</span><span class="o">[</span><span class="n">local</span><span class="o">]</span><span class="n">___</span><span class="o">[</span><span class="nl">hash:base64:</span><span class="mi">5</span><span class="o">]</span><span class="err">'</span><span class="o">,</span>
<span class="nl">minimize:</span> <span class="kc">true</span><span class="o">,</span>
<span class="nl">sourceMap:</span> <span class="kc">true</span><span class="o">,</span>
<span class="o">},</span>
<span class="o">},</span>
</code></pre></div></div>
<h3 id="2-css-module">2. CSS Module</h3>
<p>설정을 변경 후 yarn start 을 입력하면 일반 CSS가 적용되지 않는다.</p>
<p>CSS Module을 사용하면 CSS 파일을 불러온 컴포넌트 내부에서만 작동한다.
적용할 파일에 CSS 파일을 불러올때 래퍼런스 안에 넣어주어 모듈처럼 사용하는 것이다.</p>
<p>‘App.css’</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="o">.</span><span class="na">excemple_bluebox</span> <span class="o">{</span>
<span class="nl">width:</span> <span class="mi">100</span><span class="o">%;</span>
<span class="nl">height:</span> <span class="mi">100</span><span class="o">%;</span>
<span class="n">background</span><span class="o">-</span><span class="nl">color:</span> <span class="n">blue</span><span class="o">;</span>
<span class="o">}</span>
</code></pre></div></div>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kn">import</span> <span class="nn">style</span> <span class="n">from</span> <span class="err">'</span><span class="o">./</span><span class="nc">App</span><span class="o">.</span><span class="na">css</span><span class="err">'</span><span class="o">;</span>
<span class="kd">class</span> <span class="nc">App</span> <span class="kd">extends</span> <span class="nc">Component</span> <span class="o">{</span>
<span class="n">render</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="o">(</span>
<span class="o"><</span><span class="n">div</span> <span class="n">className</span><span class="o">={</span><span class="n">style</span><span class="o">.</span><span class="na">excemple_bluebox</span><span class="o">}></</span><span class="n">div</span><span class="o">></span>
<span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="n">export</span> <span class="k">default</span> <span class="nc">App</span><span class="o">;</span>
</code></pre></div></div>
<p>※ CSS Module 의 사용법</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="err">'</span><span class="n">글로벌</span> <span class="n">스타일</span> <span class="n">사용</span><span class="err">'</span>
<span class="o">:</span><span class="n">global</span> <span class="o">.</span><span class="na">excemple_bluebox</span> <span class="o">{</span>
<span class="nl">width:</span> <span class="mi">100</span><span class="o">%;</span>
<span class="nl">height:</span> <span class="mi">100</span><span class="o">%;</span>
<span class="n">background</span><span class="o">-</span><span class="nl">color:</span> <span class="n">blue</span><span class="o">;</span>
<span class="o">}</span>
<span class="err">'</span><span class="n">여러</span> <span class="n">개의</span> <span class="n">클래스를</span> <span class="n">적용해야</span> <span class="n">할</span> <span class="n">때</span><span class="err">'</span>
<span class="o"><</span><span class="n">div</span> <span class="n">className</span><span class="o">={</span><span class="err">`$</span><span class="o">{</span><span class="n">style</span><span class="o">.</span><span class="na">excemple_bluebox</span><span class="o">}</span> <span class="err">$</span><span class="o">{</span><span class="n">style</span><span class="o">.</span><span class="na">excemple_redbox</span><span class="o">}</span><span class="err">`</span><span class="o">}></</span><span class="n">div</span><span class="o">></span>
<span class="err">'</span><span class="n">특정</span> <span class="n">css를</span> <span class="n">상속할</span> <span class="n">때</span><span class="err">'</span>
<span class="o">.</span><span class="na">excemple_bluebox</span> <span class="o">{</span>
<span class="nl">composes:</span> <span class="n">redbox</span><span class="o">;</span>
<span class="n">background</span><span class="o">-</span><span class="nl">color:</span> <span class="n">blue</span><span class="o">;</span>
<span class="o">}</span>
<span class="err">'</span><span class="n">다른</span> <span class="n">클래스에서</span> <span class="n">가져와야</span> <span class="n">할</span> <span class="n">때</span><span class="err">'</span>
<span class="o">.</span><span class="na">excemple_bluebox</span> <span class="o">{</span>
<span class="nl">composes:</span> <span class="n">className</span> <span class="n">from</span> <span class="s">"./style.css"</span><span class="o">;</span>
<span class="n">background</span><span class="o">-</span><span class="nl">color:</span> <span class="n">blue</span><span class="o">;</span>
<span class="o">}</span>
</code></pre></div></div>
<h3 id="3-css-전처리기">3. CSS 전처리기</h3>
<p>CSS 전처리기는 CSS 문서의 작성에 도움을 주는 도구이다.
CSS를 작성할 때 반복적인 작업이 요구되고 클래스의 상속과 같은 사항으로
문서는 양이 많아지고 이로 인해 유지관리에 많은 영향을 준다.</p>
<p>CSS 전처리기는 이런 문제점들을 변수, 함수, 상속 등 프로그래밍 개념을 사용해 해결한다.</p>
<p>가장 많이 사용되는 전처리기는 SASS, LESS, Stylus 가 있으며, 서로의 특징에 맞게
약간의 구문만 다를 뿐 개념 자체는 동일하다.</p>
<p>CSS 전처리기의 장점</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>1. 재사용성 - 공통 요소 또는 반복적인 항목을 변수 또는 함수로 대체
2. 유지관리 - 중첩, 상속과 같은 요소로 인해 구조화된 코드로 유지 및 관리가 용이
</code></pre></div></div>
<p>CSS 전처리기의 단점</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>'실무에서의 사용'이다. 실무에서 대부분 CSS 작업은 퍼블리셔(Publisher) 또는 디자이너(Designer)
또는 Fropnt-End 개발자가 진행하는 경우도 있는데 문제는 이들이 개발에 대한 역량과 요소를 알아야 한다는 것이다.
CSS 전처리기는 프로그래밍 한 요소를 접목했기 때문에 분기문 처리, 변수의 이해, CSS함수의 이해 등
개발적인 요소를 알아야 하기 때문이다.
</code></pre></div></div>
<p>CSS 전처리기의 기능을 간단하게 알아보자.</p>
<p>ex 1)
우리가 특정 클래스에 color 속성을 주고 값을 지정할 때 hex code 또는 RGB 로 지정한다.
그런데 특정 색상이 반복된다면 우리는 주기적으로 색상 코드를 찾고 반영을 해줘야 한다.
하지만 CSS 전처리기에서는 이런 반복되는 부분을 변수로 처리할 수 있다.
대부분 하나의 파일 안에 color-set 을 모두 정의하여 사용된다.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="n">$primary</span><span class="o">-</span><span class="nl">color:</span> <span class="err">#</span><span class="n">fff</span><span class="o">;</span>
<span class="n">$secondary</span><span class="o">-</span><span class="nl">color:</span> <span class="err">#</span><span class="mo">000</span><span class="o">;</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span> <span class="o">{</span>
<span class="n">background</span><span class="o">-</span><span class="nl">color:</span> <span class="n">$primary</span><span class="o">-</span><span class="n">color</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">B</span> <span class="o">{</span>
<span class="n">background</span><span class="o">-</span><span class="nl">color:</span> <span class="n">$secondary</span><span class="o">-</span><span class="n">color</span><span class="o">;</span>
<span class="o">}</span>
</code></pre></div></div>
<p>ex 2)
각 CSS 전처리기에는 내장함수(Built-in Functions)가 존재한다.
이 내장 함수는 이미 전처리기 내에 포함된 함수로 우리는 필요한 값들만 전달하면
이에 대한 결과를 얻을 수 있다. 예를 들어 darken(color, amount) 라는 내장 함수는
색상과 퍼센티지를 지정해 주면 거기에 알맞는 값을 출력해 준다.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="n">$color</span><span class="o">:</span> <span class="err">#</span><span class="mi">2</span><span class="n">ecc71</span><span class="o">;</span>
<span class="n">$buttonDark</span><span class="o">:</span> <span class="n">darken</span><span class="o">(</span><span class="n">$buttonColor</span><span class="o">,</span> <span class="mi">10</span><span class="o">%);</span>
<span class="o">.</span><span class="na">button</span> <span class="o">{</span>
<span class="n">background</span><span class="o">-</span><span class="nl">color:</span> <span class="n">$color</span><span class="o">;</span>
<span class="n">box</span><span class="o">-</span><span class="nl">shadow:</span> <span class="mi">0</span><span class="n">px</span> <span class="mi">5</span><span class="n">px</span> <span class="mi">0</span><span class="n">px</span> <span class="n">$buttonDark</span><span class="o">;</span>
<span class="o">}</span>
</code></pre></div></div>
<p>ex 3)
유지 관리는 가장 중요하고 눈에 띄는 장점 중 하나이다. 클래스를 정의하다 보면
상속과 공통속성을 지정하기 위해 굉장히 길게 정의해야 할때가 있다.
이런 이유로 CSS 문서가 가독성이 매우 떨어지는데 CSS 전처리기에서는
중첩(Nesting) 과 상속(Extend) 을 통해 구조화 할 수 있다.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span> <span class="o">{</span>
<span class="nl">width:</span> <span class="mi">100</span><span class="o">%;</span>
<span class="o">.</span><span class="na">A</span><span class="o">-</span><span class="n">child</span><span class="o">-</span><span class="mi">1</span> <span class="o">{</span>
<span class="nl">color:</span> <span class="n">red</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">A</span><span class="o">-</span><span class="n">child</span><span class="o">-</span><span class="mi">2</span> <span class="o">{</span>
<span class="nl">color:</span> <span class="n">blue</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span> <span class="o">{</span>
<span class="nl">color:</span> <span class="n">red</span><span class="o">;</span>
<span class="nl">padding:</span> <span class="mi">10</span><span class="n">px</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">B</span> <span class="o">{</span>
<span class="nd">@extend</span><span class="o">:</span> <span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span><span class="o">;</span>
<span class="nl">border:</span> <span class="mi">1</span><span class="n">px</span> <span class="n">solid</span> <span class="n">red</span><span class="o">;</span>
<span class="o">}</span>
</code></pre></div></div>
<p>위 내용을 컴파일하면 아래와 같다.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span> <span class="o">{</span>
<span class="nl">width:</span><span class="mi">100</span><span class="o">%;</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span> <span class="o">.</span><span class="na">A</span><span class="o">-</span><span class="n">child</span><span class="o">-</span><span class="mi">1</span> <span class="o">{</span>
<span class="nl">color:</span> <span class="n">red</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span> <span class="o">.</span><span class="na">A</span><span class="o">-</span><span class="n">child</span><span class="o">-</span><span class="mi">2</span> <span class="o">{</span>
<span class="nl">color:</span> <span class="n">blue</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">A</span><span class="o">,</span> <span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">B</span> <span class="o">{</span>
<span class="nl">color:</span> <span class="n">red</span><span class="o">;</span>
<span class="nl">padding:</span> <span class="mi">10</span><span class="n">px</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">.</span><span class="na">class</span><span class="o">-</span><span class="no">B</span> <span class="o">{</span>
<span class="nl">border:</span> <span class="mi">1</span><span class="n">px</span> <span class="n">solid</span> <span class="n">red</span><span class="o">;</span>
<span class="o">}</span>
</code></pre></div></div>
<p>이처럼 CSS 전처리기를 사용하면 많은 도움이 된다.
하지만 그 전처리기를 사용하는 실무자가 개발자가 아닐수 있다.</p>
<p>이상 CSS에 대해 알아보았다.</p>
</div>
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