LESS CSS - 在mixin中设置变量

Question

我最近开始使用LESS CSS - 它太棒了(如果你还没有,我建议你看一下).

我正在做一个项目,我想做以下事情(这不是正确的语法,它只是试图解释我的问题):

if(lightness(@background_color) <= 50%)
{
    @secondary_color = #fff;
}
else
{
    @secondary_color = #000;
}

我知道我可以使用mixins,但上面的方法可以避免每次我需要根据@background_color变量更改颜色时编写mixin (因为我将@secondary_color用于边框,背景颜色等).

我一直试图找到解决方案,但我没有运气.如果有人知道我能做些什么来完成这项工作,我很乐意听到他们的意见.

谢谢!

Answer 1

更新我只是重新阅读您的评论并更好地理解问题.这应该工作:

.secColor (@bgc, @prop) when (lightness(@bgc) >= 50%) and (@prop = color){
  color: black;
}
.secColor (@bgc, @prop) when (lightness(@bgc) >= 50%) and (@prop = background){
  background-color: black;
}
.secColor (@bgc, @prop) when (lightness(@bgc) >= 50%) and (@prop = border){
  border-color: black;
}
.secColor (@bgc, @prop) when (lightness(@bgc) >= 50%) and (@prop = all){
  color: black;
  background-color: black;      
  border-color: black;
}
.secColor (@bgc, @prop) when (lightness(@bgc) < 50%) and (@prop = color){
  color: white
}
.secColor (@bgc, @prop) when (lightness(@bgc) < 50%) and (@prop = background){
  background-color: white;
}
.secColor (@bgc, @prop) when (lightness(@bgc) < 50%) and (@prop = border){
  border-color: white;
}
.secColor (@bgc, @prop) when (lightness(@bgc) < 50%) and (@prop = all){
  color: white;
  background-color: white;      
  border-color: white;
}

然后使用mixin:

.class1 {
  .secColor (#fff, color) //should only set the color property for class1
}

.class2 {
  .secColor (#000, all) //should set all three properties for class2
}

增加了更紧凑的版本

.propSwitch (@prop, @clr) when (@prop = color) {
  color: @clr;
}
.propSwitch (@prop, @clr) when (@prop = background) {
  background-color: @clr;
}
.propSwitch (@prop, @clr) when (@prop = border) {
  border-color: @clr;
}
.propSwitch (@prop, @clr) when (@prop = all) {
  color: @clr;
  background-color: @clr;      
  border-color: @clr;
}
.secColor (@bgc, @prop) when (lightness(@bgc) >= 50%) {
  .propSwitch (@prop, #000);
}
.secColor (@bgc, @prop) when (lightness(@bgc) < 50%) {
  .propSwitch (@prop, #fff);
}