這篇來介紹button中elementUi、iview、ant中樣式結構

ant Design react

ant-react中button分兩個檔案less:

• mixins.less：根據button功能樣式不同封裝成函式。
• index.less：呼叫mixins.less中的函式來宣告button的相關class

我們先來看mixins.less的結構

• btn(基礎樣式，主要用設定按鈕通用樣式)：

.btn() {
  display: inline-block;//行內塊元素
  font-weight: @btn-font-weight;//字型粗細
  text-align: center;//字型居中
  touch-action: manipulation;//瀏覽器只允許進行滾動和持續縮放操作
  cursor: pointer;//滑鼠移上去形狀
  background-image: none;//背景圖片為空
  border: @border-width-base @border-style-base transparent;//邊框透明
  white-space: nowrap;//不換行
  .button-size(@btn-height-base; @btn-padding-base; @font-size-base; @btn-border-radius-base);//padding height font-size  border-radius設定
  user-select: none;//文字不能被選擇
  transition: all .3s @ease-in-out;//過渡
  position: relative;//相對定位

  > 
 
[email protected]{iconfont-css-prefix} {
    line-height: 1;//行高不帶單位是相對字型的比例
  }

  &,
  &:active,
  &:focus {
    outline: 0;//是繪製於元素周圍的一條線，位於邊框邊緣的外圍，可起到突出元素的作用
  }

  &:not([disabled]):hover {
    text-decoration: none;//定義標準的文字
  }

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

  &.disabled,
  &[disabled] {
    cursor: not-allowed;
    > * {
      pointer-events: none;//元素永遠不會成為滑鼠事件的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);
  }
}
 

其中的具體屬性不多說了，不知道的可以百度屬性就知道了，大概就是設定字型粗細、字型居中、不換行、過渡、定位、邊框、啟用、焦點、hover、disabled等樣式，其中btn中呼叫了button-size函式。&-lg、&-sm設定大按鈕和小按鈕，呼叫了button-size函式

• button-size(設定按鈕大小):

.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為輸入引數來設定按鈕大小，寬度通過padding和font-size就能設定寬度。

• 下一個部分是設定按鈕型別為主按鈕、次按鈕、虛線按鈕、危險按鈕、幽靈按鍵樣式函式：

.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();
}

程式碼中我們可以看到這些函式都是呼叫button-color來設定按鈕的邊框，背景，文字顏色，和呼叫button-disabled來設定禁用樣式。主要還是基礎顏色樣式不同，而且hover，active顏色樣式不一樣。而且在後面函式中btn-primary、btn-default、btn-ghost、btn-dashed、btn-danger呼叫上面的對應函式。程式碼如下：

// 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);
}

剩下就是按鈕組的樣式和圓按鈕的樣式

.button-group-base(@btnClassName) {//按鈕組的基礎樣式
  position: relative;
  display: inline-block;
  > [email protected]{btnClassName},
  > span > [email protected]{btnClassName} {
    position: relative;
    line-height: @btn-height-base - 2px;

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

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

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

  &-sm > [email protected]{btnClassName},
  &-sm > span > [email protected]{btnClassName} {
    .button-size(@btn-height-sm; @btn-padding-sm; @font-size-base; 0);
    line-height: @btn-height-sm - 2px;
    > [email protected]{iconfont-css-prefix} {
      font-size: @font-size-base;
    }
  }
}
.btn-group(@btnClassName: btn) {//按鈕組主要是設定裡面一排按鈕的邊框和圓角
  .button-group-base(@btnClassName);

  [email protected]{btnClassName} + [email protected]{btnClassName},
  [email protected]{btnClassName} + &,
  span + [email protected]{btnClassName},
  [email protected]{btnClassName} + span,
  > span + span,
  & + [email protected]{btnClassName},
  & + & {
    margin-left: -1px;
  }

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

  [email protected]{btnClassName} {
    border-radius: 0;
  }

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

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

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

  &-sm {
    > [email protected]{btnClassName}:only-child {
      border-radius: @btn-border-radius-sm;
    }
    > span:only-child > [email protected]{btnClassName} {
      border-radius: @btn-border-radius-sm;
    }
    > [email protected]{btnClassName}:first-child:not(:last-child),
    > span:first-child:not(:last-child) > [email protected]{btnClassName} {
      border-bottom-left-radius: @btn-border-radius-sm;
      border-top-left-radius: @btn-border-radius-sm;
    }
    > [email protected]{btnClassName}:last-child:not(:first-child),
    > span:last-child:not(:first-child) > [email protected]{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) > [email protected]{btnClassName} {
    border-radius: 0;
  }

  & > &:first-child:not(:last-child) {
    > [email protected]{btnClassName}:last-child {
      border-bottom-right-radius: 0;
      border-top-right-radius: 0;
      padding-right: 8px;
    }
  }

  & > &:last-child:not(:first-child) > [email protected]{btnClassName}:first-child {
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
    padding-left: 8px;
  }
}