如何为停点数量可变的梯度创建LESS mixin? [英] How do you make a LESS mixin for gradients with a variable number of stops?

问题描述

我为渐变找到的所有Less Mixins只有固定数量的停止点.逗号使用中less与css之间的冲突使变量停止无法以相同的方式进行.

All of the Less mixins I have found for gradients have only a fixed number of stops. The clash between less and css in the use f the comma makes variable stops impossible to do in the same way.

我用于2向渐变的当前mixin

Current mixin that I use for 2 way gradients

.gradient (@origin: left, @step-1: @white,  @step-2: @black, @fallback: @step-1){
    background-color: @fallback;
    background: -webkit-linear-gradient(@origin, @step-1, @step-2) @fallback no-repeat;
    background:    -moz-linear-gradient(@origin, @step-1, @step-2) @fallback no-repeat;
    background:    -ms-linear-gradient(@origin, @step-1, @step-2) @fallback no-repeat;
    background:      -o-linear-gradient(@origin, @step-1, @step-2) @fallback no-repeat;
    background:         linear-gradient(@origin, @step-1, @step-2) @fallback no-repeat;
}

3种方式

    .gradient-3-way (@origin: left,  @step-1: @white,  @step-2: @black,  @step-3: @white, @fallback: @step-1){
        background-color: @fallback;
        background: -webkit-linear-gradient(@origin, @step-1, @step-2, @step-3) @fallback no-repeat;
        background:    -moz-linear-gradient(@origin, @step-1, @step-2, @step-3) @fallback no-repeat;
        background:      -ms-linear-gradient(@origin, @step-1, @step-2, @step-3) @fallback no-repeat;
        background:      -o-linear-gradient(@origin, @step-1, @step-2, @step-3) @fallback no-repeat;
        background:         linear-gradient(@origin, @step-1, @step-2, @step-3) @fallback no-repeat;
    }

推荐答案

不需要单独的变量

您需要做的就是确保使用分号作为参数的分隔符，即使这只是您要传递的一个参数.这样就可以了:

No Separate Variable Needed

All that you need is to make sure you use a semicolon as a separator for the parameters, even if that happens to just be only one parameter you are passing. So this works:

很少

@white: #fff;
.gradient (@origin: left, @fallback: @white,  @stops){
    background-color: @fallback;
    background: -webkit-linear-gradient(@origin, @stops) @fallback no-repeat;
    background:    -moz-linear-gradient(@origin, @stops) @fallback no-repeat;
    background:    -ms-linear-gradient(@origin, @stops) @fallback no-repeat;
    background:      -o-linear-gradient(@origin, @stops) @fallback no-repeat;
    background:         linear-gradient(@origin, @stops) @fallback no-repeat;
}

.test {
   .gradient(@stops: #fff 0, #000 20px, #000 20px, #f00 20px;)
}                                                           |
                                                    this final semicolon 
                                                    causes the commas to 
                                                    become list separators
                                                    instead of parameter
                                                    separators making the whole 
                                                    thing part of one variable

CSS输出

.test {
  background-color: #ffffff;
  background: -webkit-linear-gradient(left, #ffffff 0, #000000 20px, #000000 20px, #ff0000 20px) #ffffff no-repeat;
  background: -moz-linear-gradient(left, #ffffff 0, #000000 20px, #000000 20px, #ff0000 20px) #ffffff no-repeat;
  background: -ms-linear-gradient(left, #ffffff 0, #000000 20px, #000000 20px, #ff0000 20px) #ffffff no-repeat;
  background: -o-linear-gradient(left, #ffffff 0, #000000 20px, #000000 20px, #ff0000 20px) #ffffff no-repeat;
  background: linear-gradient(left, #ffffff 0, #000000 20px, #000000 20px, #ff0000 20px) #ffffff no-repeat;
}

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