grid-framework.less
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// Framework grid generation
//
// Used only by Bootstrap to generate the correct number of grid classes given
// any value of `@grid-columns`.
.make-grid-columns() {
// Common styles for all sizes of grid columns, widths 1-12
.col(@index) {
// initial
@item: ~".col-xs-@{index}, .col-sm-@{index}, .col-md-@{index}, .col-lg-@{index}";
.col((@index + 1), @item);
}
.col(@index, @list) when (@index =< @grid-columns) {
// general; "=<" isn't a typo
@item: ~".col-xs-@{index}, .col-sm-@{index}, .col-md-@{index}, .col-lg-@{index}";
.col((@index + 1), ~"@{list}, @{item}");
}
.col(@index, @list) when (@index > @grid-columns) {
// terminal
@{list} {
position: relative;
// Prevent columns from collapsing when empty
min-height: 1px;
// Inner gutter via padding
padding-left: (@grid-gutter-width / 2);
padding-right: (@grid-gutter-width / 2);
}
}
.col(1); // kickstart it
}
.float-grid-columns(@class) {
.col(@index) {
// initial
@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); // kickstart it
}
.calc-grid-column(@index, @class, @type) when (@type = width) and (@index > 0) {
.col-@{class}-@{index} {
width: percentage((@index / @grid-columns));
}
}
.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;
}
}
.calc-grid-column(@index, @class, @type) when (@type = offset) {
.col-@{class}-offset-@{index} {
margin-left: percentage((@index / @grid-columns));
}
}
// Basic looping in LESS
.loop-grid-columns(@index, @class, @type) when (@index >= 0) {
.calc-grid-column(@index, @class, @type);
// next iteration
.loop-grid-columns((@index - 1), @class, @type);
}
// Create grid for specific class
.make-grid(@class) {
.float-grid-columns(@class);
.loop-grid-columns(@grid-columns, @class, width);
.loop-grid-columns(@grid-columns, @class, pull);
.loop-grid-columns(@grid-columns, @class, push);
.loop-grid-columns(@grid-columns, @class, offset);
}