Thursday, May 3, 2012

Sass Mixins

I was asked to make some buttons at work. I thought it might be a good idea to play with Sass mixins to generate the buttons. I got really excited about this and tried my hardest to generate the buttons from a single base color. It was fun and hard at the same time. It ended up being kind of crap.

In my earlier post about Sass color palettes I was playing with keeping all my colors in a single file. this way we can keep track of them and easily change them in the future. We won't get lost in slightly difference shades of blue everywhere. It's a good idea.

Not being an expert at color theory, I couldn't have told you how to get from one shade to another with anything other than Sass's built-in lighten() and darken() functions. That quickly got me a really terrible looking button, so I had try more complicated approaches.

I had the original CSS styles to work with already, so I tried to make legitimate guesses as to how to get from say the top of the gradient color to the bottom of the gradient color. I did math around the rgb() and though about adding or subtracting various amounts of red, green, or blue. The gradients weren't too bad, but the borders were tricky, they weren't just darker, they were redder, but only for the orange button.

So then I had the idea to inspect the hue, lightness, and saturation. I could get each colors hsl() codes, I could then figure out how different each part of the button was from the other colors, hopefully finding a way to pick a good base color. This proved a decent approach, and it seemed to work pretty much universally, well you know, it worked out okay for most of the darker colors, but lighter colors presented another problem.

It turns out that the trick is dealing with gray, especially light gray, because all of the sudden all of the supporting colors have to change and where you were once lightening colors, you may have to darken them. A decent measure of grayness was to look at saturation. Once I established grayness I also had to look at lightness before deciding which color text to use.

I spent maybe 1 to 3 hours on this and found it a fairly tedious process. It not something I'd wish on anyone else, but I did learn a bit. What do you think of the results?


This experiment was worthwhile, but we ended up just sass-ifying the webkit-only CSS the designer gave us and hard-coding each button separately. Two different buttons might have different box-shadow lengths or border sizes, not to mention hover states. I'm still glad I learned about how mixins work and that this sort of thing was definitely doable. Like a lot of approaches to design (grids, etc) I think it really takes working with a designer that can see the value in the approach and work closely with you on it from the start. Anyone have suggestions on how it could been done better?

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