Sass & Compass: The future of stylesheets?now.

Transcript

1. None

2. Brandon Mathis

3. None

4. CSS 2.1 CSS 3

5. what they see ? Speed ? Works on my phone

   ? Woah, 3D animation! ? New Fonts ? Browser competition

6. what we see what they see

7. what we see ? Way more complexity, same old tools.

   ? Selectors, properties and values. That's it? ? No variables? ? No math?

8. CSS is a declarative language made of selectors, properties, values

   and schemes for priority and inheritance, de?ning how styles apply.
9. None

10. .msg { padding: 24px; } .msg h3 { padding: 24px;

    margin: -24px -24px 0; } It looks like we're in trouble… Zounds! OK ? Repetition causes maintenance challenges ? Relationships are not clear ? Reasons are trapped in the mind of the designer Problems

11. Dear W3C, We rely on advanced text editors, calculators, color

    pickers and widgets to make writing CSS bearable. Throw us a frickin' bone.
12. None

13. Sass extends CSS3 with variables, math, mixins & more. But

    at its core, Sass is a layer of empathy between the designer and the stylesheets.

14. gem install sass >>> Change detected to: /Users/imathis/ project/sass/screen.scss overwrite

    ./screen.css sass --watch screen.scss >>> Sass is watching for changes. Press Ctrl-C to stop. Setup Bash

15. article { margin-bottom: 2em; .entry-content { border-top: 1px solid #eee;

    } } SCSS - Sassy CSS (.scss)

16. article margin-bottom: 2em .entry-content border-top: 1px solid #eee Indented Sass

    (.sass)

17. Nesting SIMPLE & BRILLIANT

18. Nesting Rules article { border-top: 1px dashed #eee; header {

    margin-bottom: 1.5em; } } article { border-top: 1px dashed #eee; } article header { margin-bottom: 1.5em; } SCSS CSS

19. article { header, section { margin-bottom: 1.5em; } } Nesting

    Rules SCSS article header, article section { margin-bottom: 1.5em; } CSS

20. article > h2 { border-top:1px dashed #eee } article ~

    article { padding-top: 1.5em } article + footer { margin-top: 0 } article * { color: #000 } article { > h2 { border-top: 1px dashed #eee } ~ article { padding-top: 1.5em } + footer { margin-top: 0 } * { color: #000 } } Nest Symbol Selectors SCSS CSS

21. a { color: blue; display: inline-block; line-height: 1.8em; } a:hover

    { color: red } a { color: blue; &:hover { color: red } display: inline-block; line-height: 1.8em; } & references a rule’s parent selectors. The Parent Selector SCSS CSS

22. article h1 { font-size: 2.4em } .blog-index article h1 {

    font-size: 2em } article { h1 { font-size: 2.4em } .blog-index & { h1 { font-size: 2em } } } & can add context to a selector. The Parent Selector SCSS CSS

23. button { background: linear-gradient(#444, #222); } .no-cssgradients button { background:

    #333 } button { background: linear-gradient(#444,#222); .no-cssgradients & { background: #333 } } The Parent Selector & loves working with Modernizr. SCSS CSS

24. #content { margin: 0 1.5em; } @media screen and (min-width:

    1280px) { #content { margin: 0 1.5em; } } #content { margin: 0 1.5em; @media screen and (min-width: 1280px) { margin: 0 2.5em } } @media rules bubble up with context. @media bubbling SCSS CSS

25. Variables A LANGUAGE’S BREAD & BUTTER

26. Using Variables ?Colors, numbers, or text. ?Understands units ?$variable: value;

27. $link-color: blue; $link-hover: red; a { color: $link-color; &:hover {

    color: $link-hover; } } a { color: blue; } a:hover { color: red; } SCSS CSS

28. $msg-pad: 24px; .msg { padding:$msg-pad; h3 { padding:$msg-pad; margin:(-$msg-pad) (-$msg-pad)

    0; }} It looks like we're in trouble… Zounds! OK ? No unnecessary repetition, low maintenance ? The variable makes relationships clear ? The designer's reasoning is evident With Sass…

29. @extend THE BOMB DIGGITY OF STYLESHEET ABSTRACTION

30. <a class="button button-delete" href="..."> Delete </a> HTML .button { background:

    blue; color: white; padding:0.2em 0.8em; border-radius:0.4em; } .button-delete { background: red; } CSS

31. .button { background: blue; color: white; padding:0.2em 0.8em; border-radius:0.4em; }

    .button-delete { @extend .button; background: red; } SCSS Using @extend

32. .button, .button-delete { background: blue; color: white; padding:0.2em 0.8em; border-radius:0.4em;

    } .button-delete { background: red; } CSS .msg .button, .msg .button-delete { font-size: 1.8em; }

33. Mixins NOW WE’RE COOKIN’

34. @mixin hover-link { text-decoration: none; &:hover { text-decoration: underline; }

    } SCSS nav a { text-decoration: none; } nav a:hover { text-decoration: underline; } CSS nav a { @include hover-link; }

35. @mixin border-radius($amount) { border-radius: $amount; -webkit-border-radius: $amount; -moz-border-radius: $amount; }

    .msg { @include border-radius(5px); } SCSS .msg { border-radius: 5px; -webkit-border-radius: 5px; -moz-border-radius: 5px; } CSS

36. Defaults and named arguments @mixin link-color($text:blue, $hover:red) { color: $text;

    &:hover { color: $hover; } } SCSS a { color: blue; } a:hover { green; } CSS a { @include link-colors($hover: green); }

37. THE RIGHT WAY Importing

38. _grid.scss _typor.scss _core.scss screen.scss screen.css Combine Sass with @import. /*

    screen.scss */ @import "core"; SCSS @import "typography", "grid";

39. You can also nest an @import. @media screen and (min-width:

    320px) { @import 'phone'; } #account { @import 'pages/account'; } SCSS

40. Math ǔ ǖǖ FINALLY

41. Math Operators Math operators (+, -, *, /, %) work

    with numbers SCSS 1em + 1em; // 2em 1em - 1em; // 0em 1in + 72pt; // 2in 6px * 4; // 24px 18 % 5; // 3

42. Division a special case SCSS font : 18px / 1.45em;

    // 18px/1.45em font : (20px / 5); // 4px font : 20px / 5 + 1; // 5px font : $base / 5; // 4px $size : 20px / 5; // 4px

43. SCSS $container : 960px; $main : 680px; $gutter : 30px;

    #sidebar { width: $container - $main - $gutter; } CSS #sidebar { width: 250px;}

44. Number Functions percentage(13/25) // 52% round(2.4) // 2 ceil(2.2) //

    3 floor(2.6) // 2 abs(-24) // 24 SCSS

45. Loops Conditions & IS IT GETTING HOT IN HERE?

46. ?Logic Operators < > <= >= == != ?@if, @else,

    @else if ?and, or Conditionals

47. 1 < 20 // true 10 <= 20 // true

    4 > 1 // true 4 >= 1 // true SCSS Relational operators (<, >, <=, >=) evaluate numbers 1 + 1 == 2 // true small != big // true #000 == black // true SCSS Comparison operators (==, !=) evaluate all data types

48. red == #f00 red == #ff0000 red == rgb(255, 0,

    0) red == rgba(255, 0, 0, 1.0) red == hsl(0deg, 100%, 100%) red == hsla(0deg, 100%, 100%, 1) SCSS

49. Conditional theming $theme: ocean; div { @if $theme == dusty

    { background: #c6bba9; color: $color; } @else if $theme == ocean { background: blue; color: white; } } SCSS

50. The if function SCSS $main-bg: #000; .main { color: if($main-bg

    == black, #fff, #000); }

51. The @for loop SCSS @for $level from 0 to 5

    { .tag-#{$level + 1} { font-size: .7em + ($level * .5em); } } CSS .tag-1 { font-size: 0.7em; } .tag-2 { font-size: 1.2em; } .tag-3 { font-size: 1.7em; } .tag-4 { font-size: 2.2em; } .tag-5 { font-size: 2.7em; }

52. The @while loop SCSS $level: 0; @while $level < 5

    { .tag-#{$level + 1} { font-size: .7em + ($level * .5em); } $level: $level + 1; } CSS .tag-1 { font-size: 0.7em; } .tag-2 { font-size: 1.2em; } .tag-3 { font-size: 1.7em; } .tag-4 { font-size: 2.2em; } .tag-5 { font-size: 2.7em; }

53. The @each loop SCSS $animals: puma, crab, emu, duck; @each

    $animal in $animals { .#{$animal}-icon { background: url('/images/#{$animal}.png'); } } CSS .puma-icon { background: url('/images/puma.png'); } .crab-icon { background: url('/images/crab.png'); } .emu-icon { background: url('/images/emu.png'); } .duck-icon { background: url('/images/duck'); }

54. Color SORRY COLOR PICKER, I’VE MET SOMEONE …

55. The RGBA function a { color: rgba(blue, .75) } p

    { background: rgba(#ffa, .25) } SCSS a { color: rgba(255, 255, 170, 0.25) } p { background: rgba(255, 255, 170, 0.25) } CSS

56. Inspecting Colors $color: red; hue($color); // 0deg saturation($color); // 100%

    lightness($color); // 50% red($color); // 100 green($color); // 0 blue($color); // 0 alpha($color); // 100 SCSS

57. $darkbg: lightness($bg) < lightness(gray); button { color: if($darkbg, #fff, #000);

    } SCSS TEXT TEXT vs

58. Manipulating Colors mix(red, yellow, 30%) mix(red, yellow) invert(blue) complement(#6cf620) grayscale(yellow)

59. HSLA Manipulations adjust-hue(#77a7f9,90) adjust-hue(#77a7f9,-90) saturate(#9b8a60,50%) desaturate(#d9a621,50%) darken(#6cf620,30%) lighten(#2e7805,50%)

60. HSLA Manipulations fade-out(#fab, .5) fade-in(rgba(#fab,.5),.5)

61. lighten($bg, 8%); darken($bg, 8%); $bg: #ccc;

62. change-color change-color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha]); SCSS

    set any property of a color

63. change-color change-color(#ba5637, $hue:60); change-color(#8e9cb3, $saturation:100); #19f65d #4288ff change-color(#6cf620, $green: 60,

    $blue: 100); #6C3C64

64. adjust-color adjust-color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha]); SCSS

    Incrementally manipulate any property of a color

65. adjust-color(#d3fa7b, $hue:60, $lightness: -20%); adjust-color(#5f8fe3, $green:100, $alpha: -0.25); #19f65d rgba(95,

    255, 227, 0.75);

66. scale-color scale-color($color, [$red], [$green], [$blue], [$saturation], [$lightness], [$alpha]); SCSS ?uidly

    scale any percentage based property of a color

67. scale-color(#adf609, $lightness:50%); adjust-color(#adf609, $lightness:50%); #d6fa84 white lightness 0% 50% 100%

    scale-color adjust-color

68. Custom Functions PUT A CHERRY ON TOP

69. @function pxem($px, $context: 16px) { @return ($px / $context) *

    1em; } article h2 { font-size: pxem(45px); } SCSS article h2 { font-size: 2.813em; } CSS

70. @function text-contrast($bg, $light:#fff, $dark:#000){ $darkbg:lightness($bg) < lightness(gray); @return if($darkbg, $light,

    $dark); } SCSS button { @include easy-button(blue); } @mixin easy-button($bg){ color: text-contrast($bg); background: linear-gradient( lighten($bg, 8), darken($bg, 8)); }
71. None

72. ?Mixin library ?Sass functions ?Environmental awareness ?Extensions What we get?

73. Setup gem install compass compass create my_project Bash

74. Configuration http_path = "/" css_dir = "stylesheets" sass_dir = "sass"

    images_dir = "images" fonts_dir = "fonts" javascripts_dir = "javascripts" output_style = :compressed Ruby

75. Helper functions adjust-lightness, scale-lightness adjust-saturation, scale-saturation image-url image-height image-width inline-image

    font-url inline-font-files pi sin cos tan more... SCSS

76. SCSS CSS header { background: url('/images/hbg.png?1351…'); } h1 { width:

    image-width('logo.png'); height: image-height('logo.png'); header { background: image-url('hbg.png'); background: inline-image('logo.png') } } header h1 { width: 220px; height: 100px; background: url('data:image/png;base64... }

77. Compass mixins Element styles Links, Lists, Float, Tables, Text General

    utilities Browser Hacks, Clear!xes, Resets Design patterns Tag Cloud, Sticky footer, Vertical rhythm CSS3 appearance, background, gradients, background-clip background-origin, background-size, border-radius box, box-shadow,box-sizing, CSS3 PIE, columns, font-face, opacity, transform, transition, more...

78. Example with CSS3 Mixins .msg { @include background(linear-gradient(#fff, #eee)); @include

    border-radius(5px); } SCSS .msg { background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #ffffff), color-stop(100%, #eeeeee)); background: -webkit-linear-gradient(#ffffff, #eeeeee); background: -moz-linear-gradient(#ffffff, #eeeeee); background: -ms-linear-gradient(#ffffff, #eeeeee); background: linear-gradient(#ffffff, #eeeeee); -moz-border-radius: 5px; -webkit-border-radius: 5px; -ms-border-radius: 5px; border-radius: 5px; } CSS

79. Pros: Cons: ? Speed ? Server load ? Creating sprite

    maps ? Writing the CSS ? Maintenance Using Sprites

80. Compass magic sprites ? Generates the sprite map ? Generates

    the CSS ? Easy to con!gure classes, spacing, etc ? Add a new image? updates automatically

81. .social-sprite, .social-amazon, .social-app-store, .social-apple, .social-blogger, .social- delicious, .social-deviantart, .social-digg, .social-dribbble,

    .social-facebook, .social-flickr, .social- forrst, .social-google, .social-html5, .social-lastfm, .social-linkedin, .social-microsoft, .social- myspace, .social-paypal, .social-rss, .social-skype, .social-stumbleupon, .social-tumblr, .social- twitter, .social-twitter2, .social-vimeo, .social-wordpress, .social-yahoo, .social-youtube { background: url('../images/social-sfdebe26bed.png') no-repeat; } .social-amazon { background-position: 0 0; height: 32px; width: 32px; } .social-app-store { background-position: 0 -32px; height: 32px; width: 32px; } .social-apple { background-position: 0 -64px; height: 32px; width: 32px; } .social-blogger { background-position: 0 -96px; height: 32px; width: 32px; } .social-delicious { background-position: 0 -128px; height: 32px; width: 32px; } .social-deviantart { background-position: 0 -160px; height: 32px; width: 32px; } .social-digg { background-position: 0 -192px; height: 32px; width: 32px; } .social-dribbble { background-position: 0 -224px; height: 32px; width: 32px; } .social-facebook { background-position: 0 -256px; height: 32px; width: 32px; } .social-flickr { background-position: 0 -288px; height: 32px; width: 32px; } .social-forrst { background-position: 0 -320px; height: 32px; width: 32px; } .social-google { background-position: 0 -352px; height: 32px; width: 32px; } .social-html5 { background-position: 0 -384px; height: 32px; width: 32px; } .social-lastfm { background-position: 0 -416px; height: 32px; width: 32px; } .social-linkedin { background-position: 0 -448px; height: 32px; width: 32px; } .social-microsoft { background-position: 0 -480px; height: 32px; width: 32px; } .social-myspace { background-position: 0 -512px; height: 32px; width: 32px; } .social-paypal { background-position: 0 -544px; height: 32px; width: 32px; } .social-rss { background-position: 0 -576px; height: 32px; width: 32px; } .social-skype { background-position: 0 -608px; height: 32px; width: 32px; } .social-stumbleupon { background-position: 0 -640px; height: 32px; width: 32px; } .social-tumblr { background-position: 0 -672px; height: 32px; width: 32px; } .social-twitter { background-position: 0 -704px; height: 32px; width: 32px; } .social-twitter2 { background-position: 0 -736px; height: 32px; width: 32px; } .social-vimeo { background-position: 0 -768px; height: 32px; width: 32px; } .social-wordpress { background-position: 0 -800px; height: 32px; width: 32px; } .social-yahoo { background-position: 0 -832px; height: 32px; width: 32px; } .social-youtube { background-position: 0 -864px; height: 32px; width: 32px; } @import "social/*.png"; @include all-social-sprites($dimensions:true);

82. ?Easy to write and share ?Sass, Images, HTML, JS, Fonts,

    etc ?Zip or Ruby gems Extensions

83. ? Fancy Buttons, Sassy Buttons - easy CSS3 buttons ?

    Animate - CSS3 animation library ? RGBApng - Generate alpha pngs from Sass ? Compass Magick - Render CSS3 Gradients to png ? Many more... Plugins & Extensions

84. umdf.org/compass

85. COLOR SHCEME CRACK THE ColorHacker

86. SCSS $key: #d3643b; $color-2: scale-color( adjust-hue($key, 26.673deg), $saturation: -74.296%, $lightness:

    82%); $color-3: scale-color( adjust-hue($key, 69.2deg), $saturation: -52%, $lightness: 64.167%); @debug(hack-colors(#d3643b #edebe6 #d6e1c7)); Reverse engineering color

87. button { @include background(linear-gradient( $color-2 0%, $color-3 50%, $key 50%,

    $color-4 100%)); border: 1px solid $color-5; } Pick gradients button { background:linear-gradient(#588EE7 0%, #1A55B5 50%, #003895 50%, #0D4AAD 100%); border: 1px solid #001F53; } $button: #003895 #588EE7 #1A55B5 #0D4AAD #001F53; @debug(color-hack($button));

88. adjust-hue($key, 32deg); adjust-hue($key,-32deg); $scheme: #d3643b #edebe6 #d6e1c7 #94c7b6 #403b33; Tweak

    color schemes

89. j.mp/color-hacker `gem install color-hacker`

90. YOU’RE ALL LOVELY PEOPLE Thank You

91. twitter + github Brandon Mathis @imathis

92. Talk links: j.mp/imathis-fowd-links