BFED: Advanced Sass/Compass

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Advanced Theming - (with Sass/Compass mixins, scripts and other techniques) http://picklebums.com/wp-content/uploads/2010/06/crayon-drawing.jpg Thursday, May 24, 12

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This guy.... Nick Cooley Principal Front-End Architect, TandemSeven: http://www.tandemseven.com @nickcooley http://www.github.com/nickcooley Thursday, May 24, 12

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This guy.... Nick Cooley Principal Front-End Architect, TandemSeven: http://www.tandemseven.com @nickcooley http://www.github.com/nickcooley Thursday, May 24, 12

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What we’ll talk about in this session... •Advanced Sass •Control Structures •Color Functions •Advanced Compass •Geometric functions and constants •DEMOS! Thursday, May 24, 12

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What this Presentation ISN’T •Sass vs LESS vs Stylus •A conversation about how Preprocessors can bloat your CSS Many great articles arguing the merits/gotchas of using a pre-processor. Here’s one I really agree with: http://bit.ly/Sassisntbad My personal opinion: “Like everything in technology, preprocessors are a tool in your arsenal. You should understand the fundamentals of CSS before relying on them.” Thursday, May 24, 12

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Let’s turn CSS up to 11 http://4.bp.blogspot.com/_8lK2el5pnbU/S-dDjMziqsI/AAAAAAAAGMc/YkZMHVA2-5k/s1600/SpinalTap_.jpg Thursday, May 24, 12

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Control Directives in Sass Very similar to a number of control directives in languages like javascript, ruby, PHP -- Sass provides some rudimentary functionality: •if/else if/else •for •while •each Thursday, May 24, 12

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@if Works like every “if” directive you’ve ever used (if, else if, else) •create exceptional cases determined by CSS controlled attribute OR •Sass also contains an “if” function which works as: if($condition, $if-true, $if-false) Thursday, May 24, 12

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@if examples •Example of default @if method implementation •Example of if() function method Thursday, May 24, 12

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@if examples •Example of default @if method implementation •Example of if() function method @if $type == bevel {...} @else if $type == matte {...} @else {...} Thursday, May 24, 12

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@if examples •Example of default @if method implementation •Example of if() function method @if $type == bevel {...} @else if $type == matte {...} @else {...} border: if($i%2==0, 1px solid #000, 4px solid #333); Thursday, May 24, 12

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@for Is different from the “for” directive in most programming languages •two types: “to” and “through” •cannot count down •can only iterate by one Thursday, May 24, 12

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•Example of “to” •Example of “through” @for examples Thursday, May 24, 12

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•Example of “to” •Example of “through” @for examples @for $i from 1 to 3 { .item-#{$i} { width: 2em * $i; } } //outputs .item-1 {width: 2em; } .item-2 {width: 4em; } Thursday, May 24, 12

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•Example of “to” •Example of “through” @for examples @for $i from 1 through 3 { .item-#{$i} { width: 2em * $i; } } //outputs .item-1 {width: 2em; } .item-2 {width: 4em; } .item-3 {width: 6em; } @for $i from 1 to 3 { .item-#{$i} { width: 2em * $i; } } //outputs .item-1 {width: 2em; } .item-2 {width: 4em; } Thursday, May 24, 12

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Iterates across a range of values using a statement evaluation until it results in false •can evaluate to < > == •WARNING: you must adjust the evaluation variable manually @while Thursday, May 24, 12

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Iterates across a range of values using a statement evaluation until it results in false •can evaluate to < > == •WARNING: you must adjust the evaluation variable manually @while $i: 8; @while $i > 0 { .box#{$i} { $factor: 100px - ($i * 10); height:$factor !important; width:$factor !important; background: #333; $i: $i - 1; } } Thursday, May 24, 12

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@each Iterates through a list of items individually •Can include list as parameter or variable Thursday, May 24, 12

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@each Iterates through a list of items individually •Can include list as parameter or variable $list: (bob, steve, rob); @each $person in $list { .#{$person}{background-image: url($person);} } // CSS output .bob {background-image:url(bob); } .steve {background-image:url(steve); } .rob {background-image:url(rob); } Thursday, May 24, 12

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Colors in Sass A really powerful feature of Sass are color methods. Sass can help you: •Create themes/schemes/palettes based on harmonious color relationships •Mix colors using color relationships •Perform color operations w/ RGB and HSL Thursday, May 24, 12

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Color Functions •complement •adjust-hue •lighten/darken •color math •AND MANY MORE! Thursday, May 24, 12

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Color Functions •complement •adjust-hue •lighten/darken •color math Thursday, May 24, 12

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Color Functions •complement •adjust-hue •lighten/darken •color math complement(red); //outputs cyan Thursday, May 24, 12

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Color Functions •complement •adjust-hue •lighten/darken •color math complement(red); //outputs cyan adjust-hue(red, 30); //outputs #ff800 Thursday, May 24, 12

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Color Functions •complement •adjust-hue •lighten/darken •color math complement(red); //outputs cyan adjust-hue(red, 30); //outputs #ff800 lighten(red, 40); //outputs #ff800 Thursday, May 24, 12

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The Boxes •A really basic demo which shows various color functions/control directives Thursday, May 24, 12

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Compass may be a framework, but it provides a number of helpful functions which can make interesting results: •Geometry functions: •sin(), cos(), tan(), pi() •Additional math functions: •e(), log(), sqrt() Advance processing in Compass Thursday, May 24, 12

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The benefits of advanced functions With these functions, you can: •Offload some of the processing for things you might do in javascript for faster performance •Be able to calculate in one place and not worry about it. •Do things like: •calculate coordinates on a circle •plot points on a graph •create some interesting designs using math! Thursday, May 24, 12

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Demos Thursday, May 24, 12

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HSL.clrpick.me •Starting off with a base color, generate related color-sets based on hsl relationships. •This can help you determine what colors might go with your initial color. •Color relationships are based on Sass color functions Thursday, May 24, 12

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So let’s put it all together HSL clrpick.me uses Sass/Compass for •Iterators •Positioning color swatches in 360 using Compass geometry •Adjusts color using pre-defined relationships Thursday, May 24, 12

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First, an example Thursday, May 24, 12

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First, an example Thursday, May 24, 12

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The Color Wheel Thursday, May 24, 12

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The Color Wheel Thursday, May 24, 12

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The Color Wheel Thursday, May 24, 12

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The Color Wheel @include circlefy(200, $deg); @mixin circlefy($radius, $deg){! ! $rad: angleToRadians($deg); ! @include radiansToCartesian($rad, $radius);! ! } @function angleToRadians($a){ ! $pi: pi(); ! $angle: ($a) / 180; ! $radians: $pi * $angle; ! @return $radians; } @mixin radiansToCartesian($r, $radius){ ! $x: round($radius * cos($r)); ! $y: round($radius * sin($r)); ! top: #{$y}px; ! left:#{$x}px; } Thursday, May 24, 12

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The S & L Bars Thursday, May 24, 12

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The S & L Bars Thursday, May 24, 12

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The S and L bars Thursday, May 24, 12

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The S and L bars $light : lightness($colorwheel1); @for $i from 0 through 10 { &:nth-child(#{$i + 1}){ $startBackground: lighten($colorwheel1, 100); $val: $i * 10; background: darken($startBackground, $val ); span {margin-left:0; right:55px;} span:after {content: "lightness: #{$val} color: #{darken($startBackground, $val )}";} } } Thursday, May 24, 12

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Links • Sass Site: sass-lang.com • Compass Site: compass-style.org • HSL Color Picker: hsl.clrpick.me or github.com/nickcooley/clrpick.me • Manning Sass Book : manning.com/netherland/ • Compass.app Site: compass.handlino.com • LiveReload : livereload.com • Codekit: incident57.com/codekit/ • FireSass : addons.mozilla.org/en-US/firefox/addon/firesass-for-firebug/ • Sass Google Group: sass-lang@googlegroups.com • Compass Google Group: compass-users@googlegroups.com Thursday, May 24, 12

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Other Great Sass Presos • Hampton Catlin - The Future of Sass: youtube.com/watch?v=MFwId6xSh2o • Chriss Eppstein: Help! My Stylesheets are a Mess! speakerdeck.com/u/chriseppstein/p/ help-my-stylesheets-are-a-mess • Dave Kaneda on Sass: vimeo.com/41600596 • Brandon Mathis: brandonmathis.com/blog/2010/09/21/fast-color-theming-with-compass- and-sass/ • Joel Oliveira and Adam Darowski: Sassive Aggressive - vimeo.com/22244178 Thursday, May 24, 12