| 1 | "use client"; |
| 2 | |
| 3 | import { useTheme as useGlobalTheme } from "next-themes"; |
| 4 | import { |
| 5 | createContext, |
| 6 | useCallback, |
| 7 | useContext, |
| 8 | useEffect, |
| 9 | useState, |
| 10 | } from "react"; |
| 11 | |
| 12 | type Theme = "light" | "dark"; |
| 13 | |
| 14 | interface PresentationThemeContextValue { |
| 15 | theme: Theme; |
| 16 | setTheme: (theme: Theme) => void; |
| 17 | resolvedTheme: Theme; |
| 18 | } |
| 19 | |
| 20 | const PresentationThemeContext = createContext< |
| 21 | PresentationThemeContextValue | undefined |
| 22 | >(undefined); |
| 23 | |
| 24 | /** |
| 25 | * Custom hook to access the presentation theme context. |
| 26 | * This is a drop-in replacement for next-themes' useTheme within the presentation route. |
| 27 | * |
| 28 | * If used outside of a PresentationThemeProvider (e.g., globally under RootLayout), |
| 29 | * it seamlessly falls back to using the global next-themes system, avoiding runtime errors. |
| 30 | */ |
| 31 | export function usePresentationTheme() { |
| 32 | const context = useContext(PresentationThemeContext); |
| 33 | const globalTheme = useGlobalTheme(); |
| 34 | |
| 35 | if (context === undefined) { |
| 36 | const theme = (globalTheme.theme === "dark" ? "dark" : "light") as Theme; |
| 37 | const resolvedTheme = ( |
| 38 | globalTheme.resolvedTheme === "dark" ? "dark" : "light" |
| 39 | ) as Theme; |
| 40 | |
| 41 | return { |
| 42 | theme, |
| 43 | setTheme: (newTheme: Theme) => { |
| 44 | globalTheme.setTheme(newTheme); |
| 45 | }, |
| 46 | resolvedTheme, |
| 47 | }; |
| 48 | } |
| 49 | return context; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * A custom theme provider for the presentation section. |
| 54 | * This creates a completely isolated theme context that doesn't affect other browser tabs. |
| 55 | * |
| 56 | * Unlike the previous version, this provider: |
| 57 | * - Does not use localStorage or listen to storage events, eliminating cross-tab flickering. |
| 58 | * - Manages theme state completely in-memory per tab. |
| 59 | * - Dynamically updates the global <html> element's dark class for the current tab only, |
| 60 | * ensuring portals (dialogs, dropdowns, etc.) receive the correct theme. |
| 61 | * - Safely restores the original html element classes and color scheme when unmounted. |
| 62 | */ |
| 63 | export function PresentationThemeProvider({ |
| 64 | children, |
| 65 | defaultTheme = "dark", |
| 66 | storageKey: _storageKey, // kept for backward compatibility (ignored/unused now) |
| 67 | syncWithDefaultTheme = false, |
| 68 | }: { |
| 69 | children: React.ReactNode; |
| 70 | defaultTheme?: Theme; |
| 71 | storageKey?: string | null; |
| 72 | syncWithDefaultTheme?: boolean; |
| 73 | }) { |
| 74 | const [theme, setThemeState] = useState<Theme>(defaultTheme); |
| 75 | |
| 76 | // Sync state if syncWithDefaultTheme is true and defaultTheme changes |
| 77 | useEffect(() => { |
| 78 | if (syncWithDefaultTheme) { |
| 79 | setThemeState(defaultTheme); |
| 80 | } |
| 81 | }, [defaultTheme, syncWithDefaultTheme]); |
| 82 | |
| 83 | const setTheme = useCallback( |
| 84 | (newTheme: Theme) => { |
| 85 | setThemeState(newTheme); |
| 86 | }, |
| 87 | [], |
| 88 | ); |
| 89 | |
| 90 | // Capture original document classes and color scheme, and restore on unmount |
| 91 | useEffect(() => { |
| 92 | if (typeof window === "undefined") return; |
| 93 | const root = window.document.documentElement; |
| 94 | const originalClass = root.className; |
| 95 | const originalColorScheme = root.style.colorScheme; |
| 96 | |
| 97 | return () => { |
| 98 | root.className = originalClass; |
| 99 | root.style.colorScheme = originalColorScheme; |
| 100 | }; |
| 101 | }, []); |
| 102 | |
| 103 | // Update HTML class and color-scheme for the current tab |
| 104 | useEffect(() => { |
| 105 | if (typeof window === "undefined") return; |
| 106 | const root = window.document.documentElement; |
| 107 | if (theme === "dark") { |
| 108 | root.classList.add("dark"); |
| 109 | root.style.colorScheme = "dark"; |
| 110 | } else { |
| 111 | root.classList.remove("dark"); |
| 112 | root.style.colorScheme = "light"; |
| 113 | } |
| 114 | }, [theme]); |
| 115 | |
| 116 | const value: PresentationThemeContextValue = { |
| 117 | theme, |
| 118 | setTheme, |
| 119 | resolvedTheme: theme, |
| 120 | }; |
| 121 | |
| 122 | return ( |
| 123 | <PresentationThemeContext.Provider value={value}> |
| 124 | <PresentationThemeWrapper>{children}</PresentationThemeWrapper> |
| 125 | </PresentationThemeContext.Provider> |
| 126 | ); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Inner wrapper that applies the theme class to a div element. |
| 131 | * This ensures Tailwind's dark: variants work correctly within the presentation. |
| 132 | */ |
| 133 | function PresentationThemeWrapper({ children }: { children: React.ReactNode }) { |
| 134 | const { theme } = usePresentationTheme(); |
| 135 | return ( |
| 136 | <div |
| 137 | className={ |
| 138 | theme === "dark" |
| 139 | ? "dark bg-background text-foreground h-full w-full" |
| 140 | : "bg-background text-foreground h-full w-full" |
| 141 | } |
| 142 | > |
| 143 | {children} |
| 144 | </div> |
| 145 | ); |
| 146 | } |
| 147 |