web/_includes/mode-toggle.html

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<!--
Switch the mode between dark and light.
v2.1
https://github.com/cotes2020/jekyll-theme-chirpy
© 2020 Cotes Chung
MIT License
-->
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<i class="mode-toggle fas fa-sun" dark-mode-invisible></i>
<i class="mode-toggle fas fa-moon" light-mode-invisible></i>
<script type="text/javascript">
class ModeToggle {
static get MODE_KEY() { return "mode"; }
static get DARK_MODE() { return "dark"; }
static get LIGHT_MODE() { return "light"; }
constructor() {
if (this.mode != null) {
if (this.mode == ModeToggle.DARK_MODE) {
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if (!this.isSysDarkPrefer) {
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this.setDark();
}
} else {
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if (this.isSysDarkPrefer) {
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this.setLight();
}
}
}
var self = this;
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/* always follow the system prefers */
this.sysDarkPrefers.addListener(function() {
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if (self.mode != null) {
if (self.mode == ModeToggle.DARK_MODE) {
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if (!self.isSysDarkPrefer) {
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self.setDark();
}
} else {
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if (self.isSysDarkPrefer) {
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self.setLight();
}
}
self.clearMode();
}
});
} /* constructor() */
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setDark() {
$('html').attr(ModeToggle.MODE_KEY, ModeToggle.DARK_MODE);
sessionStorage.setItem(ModeToggle.MODE_KEY, ModeToggle.DARK_MODE);
}
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setLight() {
$('html').attr(ModeToggle.MODE_KEY, ModeToggle.LIGHT_MODE);
sessionStorage.setItem(ModeToggle.MODE_KEY, ModeToggle.LIGHT_MODE);
}
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clearMode() {
$('html').removeAttr(ModeToggle.MODE_KEY);
sessionStorage.removeItem(ModeToggle.MODE_KEY);
}
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get sysDarkPrefers() { return window.matchMedia("(prefers-color-scheme: dark)"); }
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get isSysDarkPrefer() { return this.sysDarkPrefers.matches; }
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get isDarkMode() { return this.mode == ModeToggle.DARK_MODE; }
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get isLightMode() { return this.mode == ModeToggle.LIGHT_MODE; }
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get hasMode() { return this.mode != null; }
get mode() { return sessionStorage.getItem(ModeToggle.MODE_KEY); }
flipMode() {
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if (this.hasMode) {
if (this.isSysDarkPrefer) {
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if (this.isLightMode) {
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this.clearMode();
} else {
this.setLight();
}
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} else {
if (this.isDarkMode) {
this.clearMode();
} else {
this.setDark();
}
}
} else {
if (this.isSysDarkPrefer) {
this.setLight();
} else {
this.setDark();
}
}
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} /* flipMode() */
} /* ModeToggle */
let toggle = new ModeToggle();
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$(".mode-toggle").click(function() {
toggle.flipMode();
});
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</script>