LESS CSS-在mixin中设置变量 [英] LESS CSS - Setting variable within mixin

问题描述

我最近开始使用不用CSS -太棒了(如果您还没有使用过，我建议您检查一下) ).

I've recently starting using LESS CSS - it's awesome (I recommend you check it out if you haven't yet).

我正在一个项目中，我想执行以下操作(这不是正确的语法，只能尝试解释我的问题):

I'm working on a project, where I would like to do the following (It's not proper syntax, it's only to try and explain my problem):

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

我知道我可以为此使用mixins，但是上述方法将使我不必每次需要基于@background_color变量更改颜色时都必须编写mixins(因为我将使用@secondary_color边框，背景色等).

I know that I can use mixins for this, but the above method would save me from having to write a mixins everytime I need to change a color based on the @background_color variable (since I will be using @secondary_color for borders, background colors, etc).

我一直在寻找解决方案，但是我没有运气.如果有人对我可以做些什么有任何想法，我很想听听他们的意见.

I've been trying to find a solution, but I've had no luck. If anybody has any idea's on what I can do to make this work, I'd love to hear them.

谢谢！

推荐答案

更新我只是重新阅读您的评论，以更好地理解问题.这应该起作用:

UPDATE I just reread your comment and understand the problem better. This should work:

.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
}

添加了更紧凑的版本

.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);
}

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