143 lines
3.1 KiB
HTML
143 lines
3.1 KiB
HTML
<!-- Switch the mode between dark and light. -->
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<script type="text/javascript">
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class ModeToggle {
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static get MODE_KEY() {
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return 'mode';
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}
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static get MODE_ATTR() {
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return 'data-mode';
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}
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static get DARK_MODE() {
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return 'dark';
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}
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static get LIGHT_MODE() {
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return 'light';
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}
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static get ID() {
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return 'mode-toggle';
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}
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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() {
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return window.matchMedia('(prefers-color-scheme: dark)');
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}
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get isSysDarkPrefer() {
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return this.sysDarkPrefers.matches;
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}
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get isDarkMode() {
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return this.mode === ModeToggle.DARK_MODE;
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}
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get isLightMode() {
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return this.mode === ModeToggle.LIGHT_MODE;
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}
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get hasMode() {
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return this.mode != null;
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}
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get mode() {
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return sessionStorage.getItem(ModeToggle.MODE_KEY);
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}
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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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document.documentElement.setAttribute(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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document.documentElement.setAttribute(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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document.documentElement.removeAttribute(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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{
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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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);
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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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