I’ve been using the commute to add a few JournalBook features. Yesterday saw the addition of the prize feature everyone loves but very few need: Dark Mode! Here’s how it was built:
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Getting the CSS in order
CSS Edit 2.6.1 for Mac can be downloaded from our website for free. The most popular version among CSS Edit for Mac users is 2.6. The default filenames for the application's installer are cssedit2.6.1.dmg or CSSEdit 2.6.1.dmg etc. The actual developer of this Mac application is Mihaela Popescu. Mac Os X Lion with CSS3 Experiment - I wanted to create with only use of CSS3 the boot, the login page and finally the desktop of the Mac OS X Lion.
First on the task list was preparing the CSS for the changeover. As someone who absolutely loves CSS, I’m a little ashamed by the state of it on this project. It’s due a major refactor, but let’s not dwell on that too much!
All the colours were hard-coded, and scattered among the CSS file - a consolidation was required. I tend to write
.scss
, but this project is still set up with humble ol’ CSS. No matter, it’s 2019, we have ✨ Custom Properties! ✨To start with, I moved all the colours up to a single
:root
declaration and set them up as variables.Then I swapped out all references in the remainder of the CSS.
Finally, to create the dark mode style, I copied the
:root
variable rules, and created a ‘theme’.Thanks to the ? wonderful cascade ? (big fan in case you’re wondering), these variables are updated for any child elements.
So from a HTML point of view, theme switching is a case of changing one data attribute on one element. Nice.
JS theme switching
JournalBook is written in Preact, so this code will be a bit ES6’y.
Here’s the base App class. We call
getDefaultTheme()
(which I’ll stub out in a mo’) to set our initial state, then render the app with the aforementioned data attribute.Snell, Jason (October 18, 2010). Ios app games. Retrieved March 29, 2017.
In
getDefaultTheme()
, we first check to see if the theme has been explicitly set by the user. If so, we return it. Next, we run a matchMedia
call to see if they’ve set their OS to have the dark colour scheme. This is part of CSS Media Queries level 5, and can be read up on here. It’s only currently available in Safari tech preview, and on OS Mojave, so admitedly, this part is a niche feature. Finally, we return an empty string, which we’ll class as a preference for the default theme.Css Editor Mac Os
This all works really nicely! If you’ve set a theme, you get it. If not, you get the most appropriate theme for your system preferences.
Sidenote
This can also be achieved in CSS, with the media query:
But for the JournalBook use case, we need to first check to see if a user has explicitly set their own theme first, hence the JS involvement.
Live system switching
There is a minor issue with the current code: it doesn’t react live to system-level contrast mode changes. Is that even possible, I hear you cry! (I asked the very same question till Jason Miller came to the rescue).
I had no idea you could use
addListener
on window.matchMedia
! (another sidenote, my mind is whizzing at the possibilities with this new information).With that, we can add a listener and respond to system preference changes live in the browser!
Check out Jason’s video of the switch in action!
Here's @trysmudford's https://t.co/miJSiPIgqn in Safari TP. Such integration! pic.twitter.com/SX9wLYyxpn
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— Jason Miller ?⚛ (@_developit) January 8, 2019Manual switching
The final piece of the puzzle is the manual theme picker. Thanks to our embrace of the cascade and CSS custom properties, it’s not too bad to implement.
JournalBook doesn’t yet have any global state, so we have to manually set the data attribute, which is less than ideal. But I reckon it’s fine for what is a single attribute change for live theme switching.
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In closing
I wanted to extend a massive thanks to Jason for demonstrating
matchMedia
listeners so aptly! I can’t wait to experiment with them more!Css For Mac Os 10.13
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