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Accordion.tsx
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Accordion.tsx
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import {
ComponentType,
createContext,
ElementType,
forwardRef,
ReactNode,
useCallback,
useContext,
} from "react";
import { useControlledState } from "../utils/useControlledState.ts";
import {
Descendants,
useDescendant,
useDescendants,
} from "../utils/descendants.tsx";
const ACCORDION_NAME = "Accordion";
const ITEM_NAME = "AccordionItem";
const BUTTON_NAME = "AccordionTrigger";
const PANEL_NAME = "AccordionPanel";
const ACCORDION_CONTEXT = "AccordionContext";
const ACCORDION_ITEM_CONTEXT = "AccordionItemContext";
export function noop() {}
enum AccordionStates {
Open = "OPEN",
Collapsed = "COLLAPSED",
}
const Accordion = forwardRef(function (
{
children,
as: Comp = "div",
defaultIndex,
index: controlledIndex,
onChange,
multiple = false,
readOnly = false,
collapsible = false,
...props
}: AccordionProps,
forwardedRef
) {
const [openPanels, setOpenPanels] = useControlledState({
controlledValue: controlledIndex,
defaultValue: () => {
if (defaultIndex != null) {
if (multiple) {
// If multiple is set to true, we need to make sure the `defaultIndex`
// is an array (and vice versa).
return Array.isArray(defaultIndex) ? defaultIndex : [defaultIndex];
} else {
return Array.isArray(defaultIndex)
? defaultIndex[0] ?? 0
: defaultIndex;
}
}
if (collapsible) {
// collapsible with no defaultIndex will start with all panels collapsed
return multiple ? [] : -1;
}
return multiple ? [0] : 0;
},
calledFrom: "Accordion",
});
const onAccordionItemClick = useCallback(
(index: number) => {
if (controlledIndex != undefined) {
onChange && onChange(index);
return;
}
setOpenPanels((prevOpenPanels) => {
if (multiple) {
prevOpenPanels = prevOpenPanels as number[];
// close open panels
if (prevOpenPanels.includes(index)) {
// other panels are open OR accordion is allowed to collapse
if (prevOpenPanels.length > 1 || collapsible) {
return prevOpenPanels.filter((i) => i !== index);
}
} else {
// open panel
return [...prevOpenPanels, index].sort();
}
} else {
return prevOpenPanels === index && collapsible ? -1 : index;
}
return prevOpenPanels;
});
},
[multiple, collapsible, onChange, controlledIndex]
);
const context = {
openPanels: controlledIndex ? controlledIndex : openPanels,
onAccordionItemClick: readOnly ? noop : onAccordionItemClick,
readOnly,
};
const descendantContext = useDescendants();
return (
<Descendants value={descendantContext}>
<AccordionContext.Provider value={context}>
<Comp {...props} ref={forwardedRef} data-hb-accordion="">
{children}
</Comp>
</AccordionContext.Provider>
</Descendants>
);
});
const AccordionItem = forwardRef(function (
{
children,
as: Comp = "div",
disabled = false,
...props
}: AccordionItemProps,
forwardedRef
) {
const { openPanels } = useAccordionContext();
const index = useDescendant();
const state =
(Array.isArray(openPanels)
? openPanels.includes(index) && AccordionStates.Open
: openPanels === index && AccordionStates.Open) ||
AccordionStates.Collapsed;
const context = {
index,
state,
disabled,
};
return (
<AccordionItemContext.Provider value={context}>
<Comp {...props} ref={forwardedRef} data-hb-accordion-item="">
{children}
</Comp>
</AccordionItemContext.Provider>
);
});
const AccordionButton = forwardRef(function (
{ children, as: Comp = "button", ...props }: AccordionButtonProps,
forwardedRef
) {
const { onAccordionItemClick } = useAccordionContext();
const { disabled, index } = useAccordionItemContext();
const handleTriggerClick = (e: React.MouseEvent) => {
e.preventDefault();
if (disabled) {
return;
}
onAccordionItemClick(index);
};
return (
<Comp
{...props}
ref={forwardedRef}
data-hb-accordion-button=""
onClick={handleTriggerClick}
>
{children}
</Comp>
);
});
const AccordionPanel = forwardRef(function (
{ children, as: Comp = "div", ...props }: AccordionPanelProps,
forwardedRef
) {
const { state } = useAccordionItemContext();
return (
<Comp
{...props}
ref={forwardedRef}
data-hb-accordion-panel=""
hidden={state !== AccordionStates.Open}
>
{children}
</Comp>
);
});
const AccordionContext = createContext<
InternalAccordionContextValue | undefined
>(undefined);
const AccordionItemContext = createContext<
InternalAccordionItemContextValue | undefined
>(undefined);
const useAccordionContext = () => {
const context = useContext(AccordionContext);
if (!context) {
throw Error("useAccordionContext must be used within Accordion.");
}
return context;
};
const useAccordionItemContext = () => {
const context = useContext(AccordionItemContext);
if (!context) {
throw Error("useAccordionItemContext must be used within AccordionItem.");
}
return context;
};
Accordion.displayName = ACCORDION_NAME;
AccordionItem.displayName = ITEM_NAME;
AccordionButton.displayName = BUTTON_NAME;
AccordionPanel.displayName = PANEL_NAME;
AccordionContext.displayName = ACCORDION_CONTEXT;
AccordionItemContext.displayName = ACCORDION_ITEM_CONTEXT;
const AccordionNamespace = Object.assign(Accordion, {
Item: AccordionItem,
Button: AccordionButton,
Panel: AccordionPanel,
});
export { AccordionNamespace as Accordion };
type AccordionIndex = number | number[];
interface AccordionProps {
children: ReactNode;
index?: AccordionIndex;
defaultIndex?: AccordionIndex;
onChange?(index?: number): void;
readOnly?: boolean;
multiple?: boolean;
collapsible?: boolean;
as?: ElementType | ComponentType;
}
interface AccordionItemProps {
as?: ElementType | ComponentType;
children: ReactNode;
disabled?: boolean;
}
interface AccordionButtonProps {
as?: ElementType | ComponentType;
children: ReactNode;
}
interface AccordionPanelProps {
as?: ElementType | ComponentType;
children: ReactNode;
}
interface InternalAccordionContextValue {
openPanels: AccordionIndex;
onAccordionItemClick(index: AccordionIndex): void;
readOnly: boolean;
}
interface InternalAccordionItemContextValue {
index: number;
disabled: boolean;
state: AccordionStates;
}