I was reading through this tutorial here. In one of the examples, there's a CSS class definition like:
**
* A mixin which helps you to add depth to elements according to the Google Material Design spec:
* http://www.google.com/design/spec/layout/layout-principles.html#layout-principles-dimensionality
*
* Please note that the values given in the specification cannot be used as is. To create the same visual experience
* the blur parameter has to be doubled.
*
* Author: Florian Kutschera (@gefangenimnetz), Conceptboard GmbH (@conceptboardapp)
*
* Example usage:
*
* .card {
* width: 95px;
* height: 95px;
* background: #f4f4f4;
* -webkit-transition: all 250ms;
* -moz-transition: all 250ms;
* transition: all 250ms;
* .BoxShadowHelper(1);
* &:hover {
* .BoxShadowHelper(3);
* -webkit-transform: translateY(-5px);
* -moz-transform: translateY(-5px);
* transform: translateY(-5px);
* }
* }
*
*/
.BoxShadowHelper(@level: 1){
& when (@level = 1) {
box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}
& when (@level = 2) {
box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}
& when (@level = 3) {
box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
}
& when (@level = 4) {
box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
}
& when (@level = 5) {
box-shadow: 0 19px 38px rgba(0,0,0,0.30), 0 15px 12px rgba(0,0,0,0.22);
}
}
I...well, didn't know we could do that with classes. I've tried looking for more information, but "CSS conditional logic" didn't pull up anything. I found this question on here, about the @ symbol, but when I looked for more information, it didn't seem relevant to this code snippet.
"Conditional CSS" brings up this, this, and more questions about including stylesheets for IE.
I'd just like to know what I'm looking at in .BoxShadowHelper and .card and where I can learn more about it!
