# All files / src/window-splitter useWindowSplitterMaxValue.ts

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     "use client";
    import { useCallback, useState, type Ref, type RefCallback } from "react";
    import { type UseStateInitializer } from "../types.js";
    import { useResizeObserver } from "../useResizeObserver.js";

    /**
     * @remarks \@since 6.0.0
     */
    export interface WindowSplitterMaxValueOptions<E extends HTMLElement> {
      ref?: Ref<E>;
      vertical?: boolean;
      defaultValue?: UseStateInitializer<number>;
      secondaryPanelMinWidth: number;
    }

    /**
     * @remarks \@since 6.0.0
     */
    export interface WindowSplitterMaxValueImplementation<E extends HTMLElement> {
      max: number;
      containerRef: RefCallback<E>;
    }

    /**
     * @remarks \@since 6.0.0
     */
    export function useWindowSplitterMaxValue<E extends HTMLElement>(
      options: WindowSplitterMaxValueOptions<E>
    ): WindowSplitterMaxValueImplementation<E> {
      const {
        ref,
        vertical,
        defaultValue = Infinity,
        secondaryPanelMinWidth,
      } = options;

      const [max, setMax] = useState(defaultValue);

      const containerRef = useResizeObserver({
        ref,
        disableHeight: !vertical,
        disableWidth: vertical,
        onUpdate: useCallback(
          (entry) => {
            const [borderBoxSize] = entry.borderBoxSize;
            const size = vertical
              ? borderBoxSize.blockSize
              : borderBoxSize.inlineSize;

            setMax(size - secondaryPanelMinWidth);
          },
          [secondaryPanelMinWidth, vertical]
        ),
      });

      return { max, containerRef };
    }