button样式篇一（ant Design React）

这篇来介绍button中elementUi、iview、ant中样式结构

ant Design react

ant-react中button分两个文件less:

• mixins.less：根据button功能样式不同封装成函数。
• index.less：调用mixins.less中的函数来声明button的相关class

我们先来看mixins.less的结构

• btn(基础样式，主要用设置按钮通用样式)：

.btn() {
  display: inline-block;//行内块元素
  font-weight: @btn-font-weight;//字体粗细
  text-align: center;//字体居中
  touch-action: manipulation;//浏览器只允许进行滚动和持续缩放操作
  cursor: pointer;//鼠标移上去形状
  background-image: none;//背景图片为空
  border: @border-width-base @border-style-base transparent;//边框透明
  white-space: nowrap;//不换行
  .button-size(@btn-height-base; @btn-padding-base; @font-size-base; @btn-border-radius-base);//padding height font-size  border-radius设置
  user-select: none;//文本不能被选择
  transition: all .3s @ease-in-out;//过渡
  position: relative;//相对定位

  > .@{iconfont-css-prefix} {
    line-height: 1;//行高不带单位是相对字体的比例
  }

  &,
  &:active,
  &:focus {
    outline: 0;//是绘制于元素周围的一条线，位于边框边缘的外围，可起到突出元素的作用
  }

  &:not([disabled]):hover {
    text-decoration: none;//定义标准的文本
  }

  &:not([disabled]):active {
    outline: 0;
    transition: none;
  }

  &.disabled,
  &[disabled] {
    cursor: not-allowed;
    > * {
      pointer-events: none;//元素永远不会成为鼠标事件的target
    }
  }

  &-lg {
    .button-size(@btn-height-lg; @btn-padding-lg; @btn-font-size-lg; @btn-border-radius-base);
  }

  &-sm {
    .button-size(@btn-height-sm; @btn-padding-sm; @btn-font-size-sm; @btn-border-radius-sm);
  }
}

其中的具体属性不多说了，不知道的可以百度属性就知道了，大概就是设置字体粗细、字体居中、不换行、过渡、定位、边框、激活、焦点、hover、disabled等样式，其中btn中调用了button-size函数。&-lg、&-sm设置大按钮和小按钮，调用了button-size函数

• button-size(设置按钮大小):

.button-size(@height; @padding; @font-size; @border-radius) {
  padding: @padding;
  font-size: @font-size;
  border-radius: @border-radius;
  height: @height;
}

以height、padding、font-size、border-radius为输入参数来设置按钮大小，宽度通过padding和font-size就能设置宽度。

• 下一个部分是设置按钮类型为主按钮、次按钮、虚线按钮、危险按钮、幽灵按键样式函数：

.button-variant-primary(@color; @background) {
  .button-color(@color; @background; @background);
  &:hover,
  &:focus {
    .button-color(@color; ~`colorPalette("@{background}", 5)`; ~`colorPalette("@{background}", 5)`);
  }

  &:active,
  &.active {
    .button-color(@color; ~`colorPalette("@{background}", 7)`; ~`colorPalette("@{background}", 7)`);
  }

  .button-disabled();
}

.button-variant-other(@color; @background; @border) {
  .button-color(@color; @background; @border);

  &:hover,
  &:focus {
    .button-color(@primary-5; @background; @primary-5);
  }

  &:active,
  &.active {
    .button-color(@primary-7; @background; @primary-7);
  }

  .button-disabled();
}

.button-variant-danger(@color; @background; @border) {
  .button-color(@color; @background; @border);

  &:hover {
    .button-color(@btn-primary-color; ~`colorPalette("@{color}", 5)`; ~`colorPalette("@{color}", 5)`);
  }

  &:focus {
    .button-color(~`colorPalette("@{color}", 5)`; #fff; ~`colorPalette("@{color}", 5)`);
  }

  &:active,
  &.active {
    .button-color(@btn-primary-color; ~`colorPalette("@{color}", 7)`; ~`colorPalette("@{color}", 7)`);
  }

  .button-disabled();
}

.button-variant-ghost(@color) {
  .button-color(@color; transparent; @color);

  &:hover,
  &:focus {
    .button-color(~`colorPalette("@{color}", 5)`; transparent; ~`colorPalette("@{color}", 5)`);
  }

  &:active,
  &.active {
    .button-color(~`colorPalette("@{color}", 7)`; transparent; ~`colorPalette("@{color}", 7)`);
  }

  .button-disabled();
}

代码中我们可以看到这些函数都是调用button-color来设置按钮的边框，背景，文字颜色，和调用button-disabled来设置禁用样式。主要还是基础颜色样式不同，而且hover，active颜色样式不一样。而且在后面函数中btn-primary、btn-default、btn-ghost、btn-dashed、btn-danger调用上面的对应函数。代码如下：

// primary button style
.btn-primary() {
  .button-variant-primary(@btn-primary-color; @btn-primary-bg);
}

// default button style
.btn-default() {
  .button-variant-other(@btn-default-color; @btn-default-bg; @btn-default-border);
  &:hover,
  &:focus,
  &:active,
  &.active {
    background: @btn-default-bg;
    text-decoration: none;
  }
}

// ghost button style
.btn-ghost() {
  .button-variant-other(@btn-ghost-color, @btn-ghost-bg, @btn-ghost-border);
}

// dashed button style
.btn-dashed() {
  .button-variant-other(@btn-default-color, @btn-default-bg, @btn-default-border);
  border-style: dashed;
}

// danger button style
.btn-danger() {
  .button-variant-danger(@btn-danger-color, @btn-danger-bg, @btn-danger-border);
}

剩下就是按钮组的样式和圆按钮的样式

.button-group-base(@btnClassName) {//按钮组的基础样式
  position: relative;
  display: inline-block;
  > .@{btnClassName},
  > span > .@{btnClassName} {
    position: relative;
    line-height: @btn-height-base - 2px;

    &:hover,
    &:focus,
    &:active,
    &.active {
      z-index: 2;
    }

    &:disabled {
      z-index: 0;
    }
  }

  // size
  &-lg > .@{btnClassName},
  &-lg > span > .@{btnClassName} {
    .button-size(@btn-height-lg; @btn-padding-lg; @btn-font-size-lg; 0);
    line-height: @btn-height-lg - 2px;
  }

  &-sm > .@{btnClassName},
  &-sm > span > .@{btnClassName} {
    .button-size(@btn-height-sm; @btn-padding-sm; @font-size-base; 0);
    line-height: @btn-height-sm - 2px;
    > .@{iconfont-css-prefix} {
      font-size: @font-size-base;
    }
  }
}
.btn-group(@btnClassName: btn) {//按钮组主要是设置里面一排按钮的边框和圆角
  .button-group-base(@btnClassName);

  .@{btnClassName} + .@{btnClassName},
  .@{btnClassName} + &,
  span + .@{btnClassName},
  .@{btnClassName} + span,
  > span + span,
  & + .@{btnClassName},
  & + & {
    margin-left: -1px;
  }

  .@{btnClassName}-primary + .@{btnClassName}:not(.@{btnClassName}-primary):not([disabled]) {
    border-left-color: transparent;
  }

  .@{btnClassName} {
    border-radius: 0;
  }

  > .@{btnClassName}:first-child,
  > span:first-child > .@{btnClassName} {
    margin-left: 0;
  }
  > .@{btnClassName}:only-child {
    border-radius: @btn-border-radius-base;
  }
  > span:only-child > .@{btnClassName} {
    border-radius: @btn-border-radius-base;
  }

  > .@{btnClassName}:first-child:not(:last-child),
  > span:first-child:not(:last-child) > .@{btnClassName} {
    border-bottom-left-radius: @btn-border-radius-base;
    border-top-left-radius: @btn-border-radius-base;
  }

  > .@{btnClassName}:last-child:not(:first-child),
  > span:last-child:not(:first-child) > .@{btnClassName} {
    border-bottom-right-radius: @btn-border-radius-base;
    border-top-right-radius: @btn-border-radius-base;
  }

  &-sm {
    > .@{btnClassName}:only-child {
      border-radius: @btn-border-radius-sm;
    }
    > span:only-child > .@{btnClassName} {
      border-radius: @btn-border-radius-sm;
    }
    > .@{btnClassName}:first-child:not(:last-child),
    > span:first-child:not(:last-child) > .@{btnClassName} {
      border-bottom-left-radius: @btn-border-radius-sm;
      border-top-left-radius: @btn-border-radius-sm;
    }
    > .@{btnClassName}:last-child:not(:first-child),
    > span:last-child:not(:first-child) > .@{btnClassName} {
      border-bottom-right-radius: @btn-border-radius-sm;
      border-top-right-radius: @btn-border-radius-sm;
    }
  }

  & > & {
    float: left;
  }

  & > &:not(:first-child):not(:last-child) > .@{btnClassName} {
    border-radius: 0;
  }

  & > &:first-child:not(:last-child) {
    > .@{btnClassName}:last-child {
      border-bottom-right-radius: 0;
      border-top-right-radius: 0;
      padding-right: 8px;
    }
  }

  & > &:last-child:not(:first-child) > .@{btnClassName}:first-child {
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
    padding-left: 8px;
  }
}