Bootstrap的栅格源码
1.固定和流体容器的公共样式
// 固定和流体容器的公共样式 //@grid-gutter-widt：槽宽 .container-fixed(@gutter: @grid-gutter-width) { // margin-right: auto; margin-left: auto; padding-left: floor((@gutter / 2)); padding-right: ceil((@gutter / 2)); &:extend(.clearfix all); //继承 } // 行 .make-row(@gutter: @grid-gutter-width) { margin-left: ceil((@gutter / -2)); margin-right: floor((@gutter / -2)); &:extend(.clearfix all); }
2.调用混合入口
//固定容器 .container { .container-fixed(); //定义左右padding，margin,清除浮动 @media (min-width: @screen-sm-min) { width: @container-sm; } @media (min-width: @screen-md-min) { width: @container-md; } @media (min-width: @screen-lg-min) { width: @container-lg; } } //流体容器 .container-fluid { .container-fixed(); } // 行 .row { .make-row(); } // 列 .make-grid-columns(); // 移动优先,顺序不变 .make-grid(xs); @media (min-width: @screen-sm-min) { .make-grid(sm); } @media (min-width: @screen-md-min) { .make-grid(md); } @media (min-width: @screen-lg-min) { .make-grid(lg); }
3，定义列的混合
// 列第一步
.make-grid-columns() {
//.col(2,".col-xs-1, .col-sm-1, .col-md-1, .col-lg-1")
.col(@index) {
@item: ~".col-xs-@{index}, .col-sm-@{index}, .col-md-@{index}, .col-lg-@{index}";
.col((@index + 1), @item);
}
/* 递归
.col(3,".col-xs-1, .col-sm-1, .col-md-1, .col-lg-1,.col-xs-2, .col-sm-2, .col-md-2, .col-lg-2")
....
.col(13,str)
str:
.col-xs-1, .col-sm-1, .col-md-1, .col-lg-1,
.col-xs-2, .col-sm-2, .col-md-2, .col-lg-2,
...
.col-xs-12, .col-sm-12, .col-md-12, .col-lg-12
*/
.col(@index, @list) when (@index =< @grid-columns) {
@item: ~".col-xs-@{index}, .col-sm-@{index}, .col-md-@{index}, .col-lg-@{index}";
.col((@index + 1), ~"@{list}, @{item}");
}
/*
.col-xs-1, .col-sm-1, .col-md-1, .col-lg-1,
.col-xs-2, .col-sm-2, .col-md-2, .col-lg-2,
...
.col-xs-12, .col-sm-12, .col-md-12, .col-lg-12{
position: relative;
min-height: 1px;
padding-left: 15px;
padding-right: 15px;
}
*/
.col(@index, @list) when (@index > @grid-columns) {
@{list} {
position: relative;
min-height: 1px;
padding-left: ceil((@grid-gutter-width / 2));
padding-right: floor((@grid-gutter-width / 2));
}
}
.col(1);
}
// 列第二步
.make-grid(@class) {
//2.1
.float-grid-columns(@class);
//2.2
.loop-grid-columns(@grid-columns, @class, width);
//2.3(列排序)
.loop-grid-columns(@grid-columns, @class, pull);
.loop-grid-columns(@grid-columns, @class, push);
//2.4(列偏移)
.loop-grid-columns(@grid-columns, @class, offset);
}
//2.1
/*
* .col-xs-1,.col-xs-2,.col-xs-3,.col-xs-4,...col-xs-12{
* float: left;
* }
* */
.float-grid-columns(@class) {
.col(@index) {
@item: ~".col-@{class}-@{index}";
.col((@index + 1), @item);
}
.col(@index, @list) when (@index =< @grid-columns) { // general
@item: ~".col-@{class}-@{index}";
.col((@index + 1), ~"@{list}, @{item}");
}
.col(@index, @list) when (@index > @grid-columns) { // terminal
@{list} {
float: left;
}
}
.col(1);
}
//2.2（width） 2.3（pull push） 2.4（offset）的入口
.loop-grid-columns(@index, @class, @type) when (@index >= 0) {
.calc-grid-column(@index, @class, @type);
.loop-grid-columns((@index - 1), @class, @type);
}
// 2.2
/*
* .col-xs-12{
* width:12/12;
* }
* .col-xs-11{
* width:11/12;
* }
* ...
* .col-xs-1{
* width:1/12;
* }
* */
.calc-grid-column(@index, @class, @type) when (@type = width) and (@index > 0) {
.col-@{class}-@{index} {
width: percentage((@index / @grid-columns));
}
}
//2.3 pull 向左偏移 push 向右偏移
/*push pull:
* .col-xs-push-12{ .col-xs-pull-12{
* left:12/12; right:12/12;
* } }
* .col-xs-push-11{
* left:11/12;
* }
* ... ...
* .col-xs-push-1{
* left:1/12;
* }
* .col-xs-push-0{ .col-xs-pull-0{
* left:auto; right:auto;
* } }
* */
.calc-grid-column(@index, @class, @type) when (@type = push) and (@index > 0) {
.col-@{class}-push-@{index} {
left: percentage((@index / @grid-columns));
}
}
.calc-grid-column(@index, @class, @type) when (@type = push) and (@index = 0) {
.col-@{class}-push-0 {
left: auto;
}
}
.calc-grid-column(@index, @class, @type) when (@type = pull) and (@index > 0) {
.col-@{class}-pull-@{index} {
right: percentage((@index / @grid-columns));
}
}
.calc-grid-column(@index, @class, @type) when (@type = pull) and (@index = 0) {
.col-@{class}-pull-0 {
right: auto;
}
}
//2.4
/*
* .col-xs-offset-12{
* margin-left:12/12;
* }
* .col-xs-offset-11{
* margin-left:11/12;
* }
* ...
* .col-xs-offset-1{
* margin-left:1/12;
* }
* .col-xs-offset-0{
* margin-left:0;
* }
* */
.calc-grid-column(@index, @class, @type) when (@type = offset) {
.col-@{class}-offset-@{index} {
margin-left: percentage((@index / @grid-columns));
}
}
4.笔记
###容器 1.流体容器 width为auto 2.固定容器 阈值min-width width 大于等于1200(lg 大屏pc) 1170（1140+槽宽） 大于等于992(md 中屏pc) 970（940+槽宽） 小于1200 大于等于768(sm 平板) 750（720+槽宽） 小于992 小于768(xs 移动手机) auto 3.栅格系统 ###栅格源码分析 1.流体容器&固定容器 公共样式 margin-right: auto; margin-left: auto; padding-left: 15px; padding-right: 15px; 2.固定容器 特定样式 顺序不可变 @media (min-width: @screen-sm-min) { width: @container-sm; } @media (min-width: @screen-md-min) { width: @container-md; } @media (min-width: @screen-lg-min) { width: @container-lg; } 3.行 margin-left: -15px; margin-right: -15px; 4.列 .make-grid-columns()---> .col-xs-1, .col-sm-1, .col-md-1, .col-lg-1, .col-xs-2, .col-sm-2, .col-md-2, .col-lg-2, ... .col-xs-12, .col-sm-12, .col-md-12, .col-lg-12{ position: relative; min-height: 1px; padding-left: 15px; padding-right: 15px; } .make-grid(xs)---> float-grid-columns(@class); * .col-xs-1,.col-xs-2,.col-xs-3,.col-xs-4,...col-xs-12{ * float: left; * } .loop-grid-columns(@grid-columns, @class, width); * .col-xs-12{ * width:12/12; * } * .col-xs-11{ * width:11/12; * } * ... * .col-xs-1{ * width:1/12; * } .loop-grid-columns(@grid-columns, @class, pull); .loop-grid-columns(@grid-columns, @class, push); *push pull: * .col-xs-push-12{ .col-xs-pull-12{ * left:12/12; right:12/12; * } } * .col-xs-push-11{ * left:11/12; * } * ... ... * .col-xs-push-1{ * left:1/12; * } * .col-xs-push-0{ .col-xs-pull-0{ * left:auto; right:auto; * } } .loop-grid-columns(@grid-columns, @class, offset); ###响应式工具 ###栅格盒模型设计的精妙之处 容器两边具有15px的padding 、 行 两边具有-15px的margin 列 两边具有15px的padding 为了维护槽宽的规则， 列两边必须得要15px的padding 为了能使列嵌套行 行两边必须要有-15px的margin 为了让容器可以包裹住行 容器两边必须要有15px的padding
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