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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | import React, {
createContext,
useCallback,
useContext,
useState,
type JSX,
type ReactNode,
} from "react";
/** Setter function for updating sidebar content. */
type SidebarSetter = (content: ReactNode | undefined) => void;
/**
* Context that holds the current sidebar content node.
* Consumed by the Sidebar component to render slot content.
*/
const SidebarContentContext: React.Context<ReactNode | undefined> = createContext<
ReactNode | undefined
>(undefined);
/**
* Context that holds a stable setter for updating sidebar content.
* Consumed by layout route wrappers to declare their sidebar content.
*/
const SidebarSetterContext: React.Context<SidebarSetter | undefined> = createContext<
SidebarSetter | undefined
>(undefined);
/** Props for the SidebarProvider component. */
interface SidebarProviderProps {
/** Child components. */
children: ReactNode;
}
/** Provides sidebar slot state to the component tree. */
export function SidebarProvider({ children }: SidebarProviderProps): JSX.Element {
const [content, setContent] = useState<ReactNode | undefined>(undefined);
const stableSetContent: SidebarSetter = useCallback((node: ReactNode | undefined) => {
setContent(node);
}, []);
return (
<SidebarSetterContext.Provider value={stableSetContent}>
<SidebarContentContext.Provider value={content}>{children}</SidebarContentContext.Provider>
</SidebarSetterContext.Provider>
);
}
/** Read the current sidebar content. Returns `undefined` when no content is set. */
export function useSidebarContent(): ReactNode | undefined {
return useContext(SidebarContentContext);
}
/** Get the sidebar content setter. Must be called within a SidebarProvider. */
export function useSidebarSetter(): SidebarSetter {
const setter = useContext(SidebarSetterContext);
if (setter === undefined) {
throw new Error("useSidebarSetter must be used within a SidebarProvider");
}
return setter;
}
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