LESS:如何将mixin作为参数传递给另一个mixin? [英] LESS: How can I pass a mixin as an argument to another mixin?
问题描述
我有一些使用媒体查询应用一些规则的基本mixin
I have some basic mixins that apply some rules using media queries
.on-small(@rules) {
@media (@minWidthSmall) { @rules(); }
}
.on-medium(@rules) {
@media (@minWidthMedium) { @rules(); }
}
// and .on-large, .on-x-large and so on
我试图构建一个非常简单的基于flex的网格系统,我试图传递所提到的mixins作为参数,所以我可以有一个通用的。 make-column
mixin。如下:
And I'm trying to build a very simple flex-based grid system, I'm trying to pass the mentioned mixins as parameters so I can have a generic .make-column
mixin. as follows:
.make-col(@break-point-mixin, @span, @size) {
flex: 1;
box-sizing: border-box;
/***********************************************************
Is the following line possible in LESS somehow?
***********************************************************/
@break-point-mixin({
width: percentage(@span/@size);
min-width: percentage(@span/@size);
});
}
.grid-col-on-small(@span: 1, @size: 1) {
.make-col(@break-point-mixin: .on-small, @span, @size);
}
.grid-col-on-medium(@span: 1, @size: 1) {
.make-col(@break-point-mixin: .on-medium, @span, @size);
}
但是不幸的是,传递 @ break-point-mixin
作为参数并从中调用它.make-col
崩溃:
But unfortunately passing @break-point-mixin
as a parameter and calling it from inside .make-col
crashes with:
code>无法识别的输入。可能缺少打开'('
Unrecognised input. Possibly missing opening '('
推荐答案
mixin name)我想说你缺少这样的事实,在 .on-small
/ .on-medium
这些 small
和 medium
的东西也只是参数,因此不应该是mixin名称的一部分。考虑到你的例子变成:
In this particular case (unlike a general case with an arbitrary mixin name) I'd say you're missing the fact that in .on-small
/.on-medium
these small
and medium
things are also nothing but parameters and thus should not be a part of the mixin names. With this in mind your example becomes:
.on(small, @rules) {
@media (@minWidthSmall) {@rules();}
}
.on(medium, @rules) {
@media (@minWidthMedium) {@rules();}
}
.make-col(@device, @span, @size) {
flex: 1;
box-sizing: border-box;
.on(@device, {
width: percentage(@span/@size);
min-width: percentage(@span/@size);
});
}
// usage:
.make-col(small, @span, @size);
与 .grid-col-on - *
mixins相同,它们只是一个:
Same for your .grid-col-on-*
mixins, they are just a single:
.grid-col-on(@device, @span: 1, @size: 1) {
.make-col(@device, @span, @size);
}
等。
如果你真的想要一个灵活的/通用的网格 - 永远不会将硬编码设备/断点名称改成混合或变量名称(更多的理由和例子参见 https://github.com/less/less.js/issues/2702 )。
If you really want a flexible/generic grid - never hardcode device/breakpoint names into mixin or variable names (for more rationale and examples see https://github.com/less/less.js/issues/2702).
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