O documento discute o uso de pré-processadores CSS como Less e Sass, destacando suas funcionalidades como mixins, variáveis e aninhamento. Exemplos são fornecidos para ilustrar como compilar arquivos e utilizar diferentes bibliotecas como Compass. O autor também compartilha suas informações de contato e um link para seu blog.

1. Pré-processadores {CSS}
por: Daniel Santos
Developer

2. Por que usar um
Pré-processador?

3. Pré-processadores
❏ Mixins
❏ Extend
❏ Variables
❏ Helpers
❏ Operations
❏ Media
❏ Functions
❏ Nesting
❏ Importing
❏ Conditions
❏ Color function

4. Qual pré-processador
usar?

5. Compilando Less
no tempo de execução
<link rel=”stylesheet/less” type=”text/css” href=”style.less” />
<script type=”text/javascript” src=”js/less-1.1.3.min.js”></script>

6. Compilando Less
para um arquivo .css
$ sudo apt-get install npm
$ sudo apt-get install node-less
$ npm install -g less
$ lessc style.less > style.css

7. EXEMPLO
Less
@import
Mixins
Parametric Mixins
Nested

8. @import url("http://fonts.googleapis.com/css?family=Joti+One");
.radius (@radius) {
-webkit-border-radius: @radius;
-moz-border-radius: @radius;
-ms-border-radius: @radius;
-o-border-radius: @radius;
border-radius: @radius;
}
.texto{
text-align: center;
font-family: 'Joti One';
margin: 0;
font-weight: bold;
}

9. @import "mixin.less";
.body{
background: hardlight(#ff6600, #cccccc);
margin: 0 auto;
padding: 20px;
width: 960px;
height: 400px;
.radius(100px 60px 10px 75px);
}
h1{
.texto;
color: negation(#ff6600, #cccccc);
margin-bottom: 50px;
font-size: 40px;
}
p{
.texto;
color: difference(#ff6600, #0000ff);
font-size: 20px;
}

10. EXEMPLO
Sass
@import
$variables
@Extend

11. @import url("http://fonts.googleapis.com/css?family=Underdog")
$preto: #000
$azul: #0000ff
$rosa: #ff00cc
body
margin: 0
padding: 0
background: $preto
h1
color: $azul
font-family: 'Underdog'
font-weight: bold
text-align: center
font-size: 60px
p
@extend h1
font-size: 20px
font-weight: normal
color: $rosa

12. @import url("http://fonts.googleapis.com/css?family=Underdog");
body {
margin: 0;
padding: 0;
background: black; }
body h1, body p {
color: blue;
font-family: "Underdog";
font-weight: bold;
text-align: center;
font-size: 60px; }
body p {
font-size: 20px;
font-weight: normal;
color: #ff00cc; }

13. Algumas bibliotecas do
Saas?

18. EXEMPLO
Compass
@Import
Helpers
$Variables
Operations
@Mixin
@if, @else if, @else
@for

19. @import url("http://fonts.googleapis.com/css?family=Averia+Sans+Libre")
@import "compass/css3"
$black : #000
$white : #fff
$paragrafo : #a2c999 - 40
@mixin condicao($teste: true)
@if $teste == false
font-family: 'Averia Sans Libre'
font-size: 40px
color: $white
text-align: center
margin: 0 0 35px 0
@else if $teste == 1
font-size: 30px
color: $paragrafo
text-align: center
font-weight: normal
font-family: arial
margin: 0 0 35px 0
@else
font-size: 70px
color: #0000ff + $paragrafo
font-family: "Courier New"
margin: 0

20. @import mixin
.content
background: $black
+border-radius(25px 60px 0 40px)
width: 960px
height: 300px
margin: 0 auto
h1
+condicao(false)
p
+condicao(1)
.paragrafo
+condicao

21. @import url("http://fonts.googleapis.com/css?family=Averia+Sans+Libre");
.content {
background: black;
-webkit-border-radius: 25px 60px 0 40px;
-moz-border-radius: 25px 60px 0 40px;
-ms-border-radius: 25px 60px 0 40px;
-o-border-radius: 25px 60px 0 40px;
border-radius: 25px 60px 0 40px;
width: 960px;
height: 300px;
margin: 0 auto;
}
.content h1 {
font-family: "Averia Sans Libre";
font-size: 40px;
color: white;
text-align: center;
margin: 0 0 35px 0;
}
.content p {
font-size: 30px;
color: #7aa171;
text-align: center;
font-weight: normal;
font-family: arial;
margin: 0 0 35px 0;
}
.content .paragrafo {
font-size: 70px;
color: #7aa1ff;
font-family: "Courier New";
margin: 0;
}

22. @import url("http://fonts.googleapis.com/css?family=Averia+Sans+Libre")
@import "compass/css3"
$branco : #fff
$verde : #00ff00
$circulo: #0000ff - 80
$class: teste_for !default
@for $i from 1 through 2
.#{$class}_#{$i}
width: 100%
height: 40px
background: $circulo
margin-bottom: 40px
+border-radius(40px)

23. @import mixin
.content
background: $branco
+box-shadow($verde 6px 6px 40px)
width: 960px
height: 400px
margin: 0 auto
padding-top: 30px

24. @import url("http://fonts.googleapis.com/css?family=Averia+Sans+Libre");
.teste_for_1 {
width: 100%;
height: 40px;
background: #0000af;
margin-bottom: 40px;
-webkit-border-radius: 40px;
-moz-border-radius: 40px;
-ms-border-radius: 40px;
-o-border-radius: 40px;
border-radius: 40px;
}
.teste_for_2 {
width: 100%;
height: 40px;
background: #0000af;
margin-bottom: 40px;
-webkit-border-radius: 40px;
-moz-border-radius: 40px;
-ms-border-radius: 40px;
-o-border-radius: 40px;
border-radius: 40px;
}
.content {
background: white;
-webkit-box-shadow: green 6px 6px 40px;
-moz-box-shadow: green 6px 6px 40px;
box-shadow: green 6px 6px 40px;
width: 960px;
height: 400px;
margin: 0 auto;
padding-top: 30px;
}

25. @import url("http://fonts.googleapis.com/css?family=Averia+Sans+Libre");
.teste_for_1 {
width: 100%;
height: 40px;
background: #0000af;
margin-bottom: 40px;
-webkit-border-radius: 40px;
-moz-border-radius: 40px;
-ms-border-radius: 40px;
-o-border-radius: 40px;
border-radius: 40px;
}
.teste_for_2 {
width: 100%;
height: 40px;
background: #0000af;
margin-bottom: 40px;
-webkit-border-radius: 40px;
-moz-border-radius: 40px;
-ms-border-radius: 40px;
-o-border-radius: 40px;
border-radius: 40px;
}
.content {
background: white;
-webkit-box-shadow: green 6px 6px 40px;
-moz-box-shadow: green 6px 6px 40px;
box-shadow: green 6px 6px 40px;
width: 960px;
height: 400px;
margin: 0 auto;
padding-top: 30px;
}

26. OBRIGADO!!!
Daniel Santos
Developer
code@justdigital.com.br
+55(11)5181-5170
www.justdigital.com.br
http://blog.justdigital.com.br