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Prevent a flash of white color when dark mode is enabled (#3647)
This is done by moving the code that's responsible for color mode into a separate file that's loaded early. Bonus: this file is included only for non-default dark mode settings.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| function setColorMode(mode) { | ||
| // Switch between light/dark theme. `mode` is a string value of either 'dark' or 'light'. | ||
| var hljs_light = document.getElementById('hljs-light'), | ||
| hljs_dark = document.getElementById('hljs-dark'); | ||
| document.documentElement.setAttribute('data-bs-theme', mode); | ||
| if (mode == 'dark') { | ||
| hljs_light.disabled = true; | ||
| hljs_dark.disabled = false; | ||
| } else { | ||
| hljs_dark.disabled = true; | ||
| hljs_light.disabled = false; | ||
| } | ||
| } | ||
|
|
||
| function updateModeToggle(mode) { | ||
| // Update icon and toggle checkmarks of color mode selector. | ||
| var menu = document.getElementById('theme-menu'); | ||
| document.querySelectorAll('[data-bs-theme-value]') | ||
| .forEach(function(toggle) { | ||
| if (mode == toggle.getAttribute('data-bs-theme-value')) { | ||
| toggle.setAttribute('aria-pressed', 'true'); | ||
| toggle.lastElementChild.classList.remove('d-none'); | ||
| menu.firstElementChild.setAttribute('class', toggle.firstElementChild.getAttribute('class')); | ||
| } else { | ||
| toggle.setAttribute('aria-pressed', 'false'); | ||
| toggle.lastElementChild.classList.add('d-none'); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| function onSystemColorSchemeChange(event) { | ||
| // Update site color mode to match system color mode. | ||
| setColorMode(event.matches ? 'dark' : 'light'); | ||
| } | ||
|
|
||
| var mql = window.matchMedia('(prefers-color-scheme: dark)'), | ||
| defaultMode = document.documentElement.getAttribute('data-bs-theme'), | ||
| storedMode = localStorage.getItem('mkdocs-colormode'); | ||
| if (storedMode && storedMode != 'auto') { | ||
| setColorMode(storedMode); | ||
| updateModeToggle(storedMode); | ||
| } else if (storedMode == 'auto' || defaultMode == 'auto') { | ||
| setColorMode(mql.matches ? 'dark' : 'light'); | ||
| updateModeToggle('auto'); | ||
| mql.addEventListener('change', onSystemColorSchemeChange); | ||
| } else { | ||
| setColorMode(defaultMode); | ||
| updateModeToggle(defaultMode); | ||
| } | ||
|
|
||
| document.querySelectorAll('[data-bs-theme-value]') | ||
| .forEach(function(toggle) { | ||
| toggle.addEventListener('click', function (e) { | ||
| var mode = e.currentTarget.getAttribute('data-bs-theme-value'); | ||
| localStorage.setItem('mkdocs-colormode', mode); | ||
| if (mode == 'auto') { | ||
| setColorMode(mql.matches ? 'dark' : 'light'); | ||
| mql.addEventListener('change', onSystemColorSchemeChange); | ||
| } else { | ||
| setColorMode(mode); | ||
| mql.removeEventListener('change', onSystemColorSchemeChange); | ||
| } | ||
| updateModeToggle(mode); | ||
| }); | ||
| }); |