120 lines
3 KiB
HTML
120 lines
3 KiB
HTML
<!--
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Switch the mode between dark and light.
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-->
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<script type="text/javascript">
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class ModeToggle {
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static get MODE_KEY() { return "mode"; }
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static get MODE_ATTR() { return "data-mode"; }
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static get DARK_MODE() { return "dark"; }
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static get LIGHT_MODE() { return "light"; }
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static get ID() { return "mode-toggle"; }
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constructor() {
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if (this.hasMode) {
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if (this.isDarkMode) {
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if (!this.isSysDarkPrefer) {
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this.setDark();
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}
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} else {
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if (this.isSysDarkPrefer) {
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this.setLight();
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}
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}
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}
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let self = this;
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/* always follow the system prefers */
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this.sysDarkPrefers.addEventListener('change', () => {
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if (self.hasMode) {
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if (self.isDarkMode) {
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if (!self.isSysDarkPrefer) {
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self.setDark();
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}
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} else {
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if (self.isSysDarkPrefer) {
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self.setLight();
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}
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}
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self.clearMode();
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}
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self.notify();
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});
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} /* constructor() */
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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; }
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get mode() { return sessionStorage.getItem(ModeToggle.MODE_KEY); }
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/* get the current mode on screen */
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get modeStatus() {
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if (this.isDarkMode || (!this.hasMode && this.isSysDarkPrefer)) {
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return ModeToggle.DARK_MODE;
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} else {
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return ModeToggle.LIGHT_MODE;
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}
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}
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setDark() {
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$('html').attr(ModeToggle.MODE_ATTR, ModeToggle.DARK_MODE);
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sessionStorage.setItem(ModeToggle.MODE_KEY, ModeToggle.DARK_MODE);
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}
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setLight() {
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$('html').attr(ModeToggle.MODE_ATTR, ModeToggle.LIGHT_MODE);
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sessionStorage.setItem(ModeToggle.MODE_KEY, ModeToggle.LIGHT_MODE);
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}
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clearMode() {
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$('html').removeAttr(ModeToggle.MODE_ATTR);
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sessionStorage.removeItem(ModeToggle.MODE_KEY);
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}
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/* Notify another plugins that the theme mode has changed */
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notify() {
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window.postMessage({
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direction: ModeToggle.ID,
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message: this.modeStatus
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}, "*");
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}
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flipMode() {
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if (this.hasMode) {
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if (this.isSysDarkPrefer) {
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if (this.isLightMode) {
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this.clearMode();
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} else {
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this.setLight();
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}
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} else {
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if (this.isDarkMode) {
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this.clearMode();
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} else {
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this.setDark();
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}
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}
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} else {
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if (this.isSysDarkPrefer) {
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this.setLight();
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} else {
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this.setDark();
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}
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}
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this.notify();
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} /* flipMode() */
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} /* ModeToggle */
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const modeToggle = new ModeToggle();
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</script>
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