@charset "utf-8";

// 定义常见弹性布局
@mixin _flex {
    height: 100%;
    &,
    .flex-inherit {
        @include flexbox;
        @include flex-direction(map-get($flex, direction));
        overflow: hidden;
    }
    > .flex,
    .flex-inherit,
    .flex-inherit > .flex {
        @include flex(1, map-get($flex, direction));
        position: relative;
    }
    > .flex,
    .flex-inherit > .flex {
        @include overflow;
        // 用于解决flex无法将动态高度继承给子元素
        // 这里单独处理flex的子元素为yo-flex的情况,yo-flex通过绝对定位拉伸来得到高度
        // 请使用 flex-inherit 的方式来进行嵌套(推荐)
        > .yo-flex {
            @include fullscreen;
        }
    }
}

/**
 * @module layout
 * @method yo-flex
 * @version 3.0.0
 * @description 构造弹性布局使用方法,可以是横向和纵向
 * @demo http://ued.qunar.com/hy2/yo/demo/src/html/layout/yo-flex.html
 * @param {String} $name 定义扩展名称 <3.0.0>
 * @param {String} $direction 指定是水平或者垂直布局 <3.0.0>
 */

@mixin yo-flex(
    $name: default,
    $direction: default) {
    // 区别是否新增实例还是修改本身
    $name: if($name == default, "", "-#{$name}");
    // 如果值为default,则取config的定义
    @if $direction == default {
        $direction: map-get($flex, direction);
    }
    .yo-flex#{$name} {
        &,
        .flex-inherit {
            // 如果$direction不等于config预设,则重绘方向
            @if $direction != map-get($flex, direction) {
                @include flex-direction($direction);
            }
        }
        > .flex,
        .flex-inherit,
        .flex-inherit > .flex {
            // 如果$direction不等于config预设,则重绘方向
            @if $direction != map-get($flex, direction) {
                @include flex(1, $direction);
            }
        }
        // 增量扩展
        @content;
    }
}

// 调用本文件时载入弹性布局基础构造
.yo-flex {
    @include _flex;
}