// 全局mix函数

// 清除浮动
.clearfix() {
  &:before,
  &:after {
    content: " "; // 1
    display: table; // 2
  }
  &:after {
    clear: both;
  }
}

// 强制换行
.break-all() {
  word-break: break-all;
  word-wrap: break-word;
}
// 文字溢出处理
.text-overflow() {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

//**
// * @desc 绘制三角形  http://lugolabs.com/caret
// * @param {String} $position
// * @param {Number} $caret-width 三角形外宽度
// * @param {Number} $border-width 三角形内宽度
// * @param {String} $direction 三角形方向
// * @param {String} $border-color 边框颜色
// * @param {String} $background-color 背景颜色
// */
.caret(@position, @caret-width, @border-width, @direction, @border-color, @background-color){
  position: relative;

  &:before,
  &:after {
    content:"";
    position: absolute;
  }
  // top
  & when (@direction = top) {
    &:before {
      top:0;
      left: 0;
      border-bottom: @caret-width solid @border-color;
      border-left: @caret-width solid transparent;
      border-right: @caret-width solid transparent;
    }
    &:after {
      left: @border-width;
      top: @border-width;
      border-bottom: (@caret-width - @border-width) solid @background-color;
      border-left: (@caret-width - @border-width) solid transparent;
      border-right: (@caret-width - @border-width) solid transparent;
    }
  }

  // right
  & when (@direction = right) {
    &:before {
      top:0;
      left: 0;
      border-left: @caret-width solid @border-color;
      border-top: @caret-width solid transparent;
      border-bottom: @caret-width solid transparent;
    }
    &:after {
      left: 0;
      top: @border-width;
      border-left: (@caret-width - @border-width) solid @background-color;
      border-top: (@caret-width - @border-width) solid transparent;
      border-bottom: (@caret-width - @border-width) solid transparent;
    }
  }

  //  bottom
  & when (@direction = bottom) {
    &:before {
      top:0;
      left: 0;
      border-top: @caret-width solid @border-color;
      border-left: @caret-width solid transparent;
      border-right: @caret-width solid transparent;
    }
    &:after {
      left: @border-width;
      top: 0;
      border-top: (@caret-width - @border-width) solid @background-color;
      border-left: (@caret-width - @border-width) solid transparent;
      border-right: (@caret-width - @border-width) solid transparent;
    }
  }

  // left
  & when (@direction = left) {
    &:before {
      top:0;
      left: 0;
      border-right: @caret-width solid @border-color;
      border-top: @caret-width solid transparent;
      border-bottom: @caret-width solid transparent;
    }
    &:after {
      left: @border-width;
      top: @border-width;
      border-right: (@caret-width - @border-width) solid @background-color;
      border-top: (@caret-width - @border-width) solid transparent;
      border-bottom: (@caret-width - @border-width) solid transparent;
    }
  }
}


// * @desc 移动端1px的线 利用伪类+background-image
.hairline(@position, @color)  {
  // top
  & when (@position = top) {
    &:before {
      left: 0;
      top: 0;
      bottom: auto;
      right: auto;
      height: 1Px;
      width: 100%;
      .hairline-background-image(@color);
      background-size: 100% 1Px;
    }
  }
  // left
  & when (@position = left) {
    &:before {
      left: 0;
      top: 0;
      bottom: auto;
      right: auto;
      width: 1Px;
      height: 100%;
      .hairline-background-image(@color);
      background-size: 1Px 100%;
    }
  }
  // bottom
  & when (@position = bottom) {
    &:after {
      left: 0;
      bottom: 0;
      right: auto;
      top: auto;
      height: 1Px;
      width: 100%;
      .hairline-background-image(@color);
      background-size: 100% 1Px;
    }
  }
  // right
  & when (@position = right) {
    &:after {
      right: 0;
      top: 0;
      left: auto;
      bottom: auto;
      width: 1Px;
      height: 100%;
      .hairline-background-image(@color);
      background-size: 1Px 100%;
    }
  }
}

.hairline-background-image(@color) {
  content: "";
  position: absolute;
  display: block;
  z-index: 15;
  background-image: linear-gradient(180deg, @color, @color 50%, transparent 50%);
  background-repeat: no-repeat;
}

//**
// * @desc 文本多行文字截断
// * @param {Number} @lines 行数
// * @param {Number} @line-height 行高 当@lines=1的时候，@line-height默认传0，相当于截取的字节数
// */
.line-clamp(@lines, @line-height: 1.4em) {
  text-overflow: ellipsis;
  overflow: hidden;
  & when (@lines = 1) {
    white-space: nowrap;
    width: 100% - @line-height;
  }

  & when not (@lines = 1) {
    .flexbox();
    -webkit-box-orient: vertical;
    box-orient: vertical;
    -webkit-line-clamp: @lines;
    line-clamp: @lines;
    line-height: @line-height;
    max-height: @line-height * @lines;
  }
}

// * @desc 文本占位符样式重置
.placeholder(@color: @input-color-placeholder) {
  // Firefox
  &::-moz-placeholder {
    color: @color;
    opacity: 1; // Override Firefox's unusual default opacity; see https://github.com/twbs/bootstrap/pull/11526
  }
  &:-ms-input-placeholder { color: @color; } // Internet Explorer 10+
  &::-webkit-input-placeholder  { color: @color; } // Safari and Chrome
}


/**
/* @desc 滚动条的样式
/* ::-webkit-scrollbar 滚动条整体部分
/* ::-webkit-scrollbar-thumb 滚动条里面的小方块，能向上向下移动（或往左往右移动，取决于是垂直滚动条还是水平滚动条）
/* ::-webkit-scrollbar-track 滚动条的轨道（里面装有Thumb）
/* ::-webkit-scrollbar-button 滚动条的轨道的两端按钮，允许通过点击微调小方块的位置。
/* ::-webkit-scrollbar-track-piece 内层轨道，滚动条中间部分（除去）
/* ::-webkit-scrollbar-corner 边角，即两个滚动条的交汇处
/* ::-webkit-resizer 两个滚动条的交汇处上用于通过拖动调整元素大小的小控件
 */
 .scrollbar(@color: #f5f5f5; @width: 16px; @height: 16px) {
  ///定义滚动条高宽及背景 高宽分别对应横竖滚动条的尺寸/
  &::-webkit-scrollbar {
    width: @width;
    height: @height;
    background-color: @color;
  }
//  /定义滚动条轨道 内阴影+圆角/
  &::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
    border-radius: 10px;
    background-color: @color;
  }

// /定义滑块 内阴影+圆角/
  &::-webkit-scrollbar-thumb {
    border-radius: 10px;
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);
    background-color: #555;
  }
}