# flex-item()

## 용도 <a href="#use" id="use"></a>

[Flex Item](https://developer.mozilla.org/ko/docs/Glossary/Flex_Item) 요소에 설정 가능한 속성을 빠르고 효율적으로 처리할 때 사용하는 믹스인입니다.

#### Flexbox 아이템 속성

| 속성                                                                        | 표준 값                                                                                                       |
| ------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- |
| [flex-grow](https://developer.mozilla.org/ko/docs/Web/CSS/flex-grow)      | 0, 양수                                                                                                      |
| [flex-shrink](https://developer.mozilla.org/ko/docs/Web/CSS/flex-shrink)  | 0, 양수                                                                                                      |
| [flex-basis](https://developer.mozilla.org/ko/docs/Web/CSS/flex-basis)    | content \| \<width> ( length, percentage, auto 중 하나)                                                       |
| [align-self](https://developer.mozilla.org/en-US/docs/Web/CSS/align-self) | flex-start \| center \| flex-end \| self-start \| self-end \| baseline \| stretch \| safe \| unsafe \| ... |
| [order](https://developer.mozilla.org/ko/docs/Web/CSS/order)              | 정수 (음수, 0, 양수)                                                                                             |

#### 믹스인에 사용 가능한 속성 (값은 연이어 설정)

| 믹스인에서 사용되는 속성 + 값             | 컴파일 되는 표준 속성             |                       |                           |                              |                        |                                |                                  |                                 |                               |                          |                               |                           |                             |            |
| ----------------------------- | ------------------------ | --------------------- | ------------------------- | ---------------------------- | ---------------------- | ------------------------------ | -------------------------------- | ------------------------------- | ----------------------------- | ------------------------ | ----------------------------- | ------------------------- | --------------------------- | ---------- |
| `grow`  또는 `g` + 값            | flex-grow                |                       |                           |                              |                        |                                |                                  |                                 |                               |                          |                               |                           |                             |            |
| `shrink` 또는 `s` + 값           | flex-shrink              |                       |                           |                              |                        |                                |                                  |                                 |                               |                          |                               |                           |                             |            |
| `basis` 또는 `b` + 값            | flex-basis               |                       |                           |                              |                        |                                |                                  |                                 |                               |                          |                               |                           |                             |            |
| `auto` \| `initial` \| `none` | flex                     |                       |                           |                              |                        |                                |                                  |                                 |                               |                          |                               |                           |                             |            |
| <p><code>self-start</code>    | <code>self-center</code> | <code>self-end</code> | <code>self-stretch</code> | <br><code>self-normal</code> | <code>self-auto</code> | <br><code>self-baseline</code> | <code>self-first-baseline</code> | <code>self-last-baseline</code> | </p><p><code>self-safe</code> | <code>self-unsafe</code> | <br><code>self-initial</code> | <code>self-inherit</code> | <code>self-unset</code></p> | align-self |
| `order` 또는 `o` + 값            | order                    |                       |                           |                              |                        |                                |                                  |                                 |                               |                          |                               |                           |                             |            |

## 사용법 <a href="#usage" id="usage"></a>

`flex-item()` 믹스인에 설정 가능한 값을 리스트로 전달합니다.

> flex-item($args:**list**)

```ruby
.usage {
  @include flex-item(self-end s 0 o 10);
}
```

| 매개변수(parameter) | 유형(type) | 필수(required) | 기본 값(default) |
| :-------------: | :------: | :----------: | :-----------: |
|      $args      |   list   |      ✔︎      |               |

위 예시 코드는 아래의 CSS로 컴파일 되어 출력됩니다.

```css
.usage {
  align-self: flex-end;
  flex: 0 0 auto;
  order: 10;
}
```

{% hint style="info" %}
flex-item() 믹스인 보다 간추려 쓰기 위한 flex-i() 믹스인 이름도 제공합니다.

```ruby
.usage {
  @include flex-i(self-end s 0 o 10);
}
```

{% endhint %}

## 로직 <a href="#logic" id="logic"></a>

`flex-item()` 믹스인은 다음의 로직에 의해 작성되었습니다.&#x20;

```javascript
@mixin flex-item($args) {
  @if $args != null {
    // align-self
    @each $keyword
      in self-auto
      self-normal
      self-start
      self-end
      self-center
      self-stretch
      self-baseline
      self-first-baseline
      self-last-baseline
      self-safe
      self-unsafe
      self-inherit
      self-initial
      self-unset
    {
      $self-value-index: index($args, $keyword);
      @if $self-value-index {
        $self-value: nth($args, $self-value-index);
        @include align-self($self-value, flex);
      }
    }

    @if is-include-items($args, auto initial none) {
      @if index($args, auto) {
        @include flex(auto);
      }
      @if index($args, initial) {
        @include flex(initial);
      }
      @if index($args, none) {
        @include flex(none);
      }
    }

    @if is-include-items($args, grow g shrink s basis b) {
      // flex-grow
      $grow-value: get-match-value-of-keys($args, grow g);
      // flex-shrink
      $shrink-value: get-match-value-of-keys($args, shrink s);
      // flex-basis
      $basis-value: get-match-value-of-keys($args, basis b);

      // flex
      @include flex(
        if($grow-value, $grow-value, 0) if($shrink-value, $shrink-value, 1)
          if($basis-value, $basis-value, auto)
      );
    }

    // order
    $order-value: get-match-value-of-keys($args, order o);
    @if $order-value {
      @include order($order-value);
    }
  }
}
```

1. 전달 받은 `$args` 매개변수를 분석하여 설정 가능한 속성을 처리
2. `self-*` 키워드 값을 분석해 [align-self()](/scss-mixins/mixins/box-alignment/align-self.md) 믹스인 호출
3. `auto` , `initial` , `none` 키워드를 사용한 경우, [flex()](/scss-mixins/mixins/flexbox/flex-item/flex.md) 믹스인 호출
4. `grow`, `shrink` , `basis` 키워드를 사용한 경우, 각 값을 조립해 [flex()](/scss-mixins/mixins/flexbox/flex-item/flex.md) 믹스인에 전달하여 호출
5. `order` 키워드의 경우 뒤이어 제공된 값과 함께 속성 설정

`flex-i()` 믹스인은 `flex-item()` 믹스인 래퍼로 보다 간단하게 쓰기 위해 작성되었습니다.

```ruby
@mixin flex-i($args) {
  @include flex-item($args);
}
```

## 참고 <a href="#reference" id="reference"></a>

믹스인에 사용된 Sass의 빌트인 모듈은 다음과 같습니다.

* [@mixin / @include](https://sass-lang.com/documentation/at-rules/mixin)
* [@if / @else](https://sass-lang.com/documentation/at-rules/control/if)
* [@each](https://sass-lang.com/documentation/at-rules/control/each)
* [index()](https://sass-lang.com/documentation/modules/list#index)

믹스인에 사용된 자체 제작한 모듈은 다음과 같습니다.

* [is-include-items()](/scss-mixins/utilities/validation/is-include-items.md)
* [get-match-value-of-keys()](/scss-mixins/utilities/list/get-match-value-of-keys.md)
* [flex()](/scss-mixins/mixins/flexbox/flex-item/flex.md)
* [order()](/scss-mixins/mixins/display/order.md)
* [align-self()](/scss-mixins/mixins/box-alignment/align-self.md)


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