@mui/x-tree-view/esm/internals/plugins/useTreeViewFocus/useTreeViewFocus.js

The community edition of the MUI X Tree View components.

import _extends from "@babel/runtime/helpers/esm/extends";
import useEventCallback from '@mui/utils/useEventCallback';
import { useInstanceEventHandler } from "../../hooks/useInstanceEventHandler.js";
import { selectorDefaultFocusableItemId, selectorFocusedItemId } from "./useTreeViewFocus.selectors.js";
import { selectorIsItemExpanded } from "../useTreeViewExpansion/useTreeViewExpansion.selectors.js";
import { selectorItemMeta } from "../useTreeViewItems/useTreeViewItems.selectors.js";
export const useTreeViewFocus = ({
  instance,
  params,
  store
}) => {
  const setFocusedItemId = useEventCallback(itemId => {
    store.update(prevState => {
      const focusedItemId = selectorFocusedItemId(prevState);
      if (focusedItemId === itemId) {
        return prevState;
      }
      return _extends({}, prevState, {
        focus: _extends({}, prevState.focus, {
          focusedItemId: itemId
        })
      });
    });
  });
  const isItemVisible = itemId => {
    const itemMeta = selectorItemMeta(store.value, itemId);
    return itemMeta && (itemMeta.parentId == null || selectorIsItemExpanded(store.value, itemMeta.parentId));
  };
  const innerFocusItem = (event, itemId) => {
    const itemElement = instance.getItemDOMElement(itemId);
    if (itemElement) {
      itemElement.focus();
    }
    setFocusedItemId(itemId);
    if (params.onItemFocus) {
      params.onItemFocus(event, itemId);
    }
  };
  const focusItem = useEventCallback((event, itemId) => {
    // If we receive an itemId, and it is visible, the focus will be set to it
    if (isItemVisible(itemId)) {
      innerFocusItem(event, itemId);
    }
  });
  const removeFocusedItem = useEventCallback(() => {
    const focusedItemId = selectorFocusedItemId(store.value);
    if (focusedItemId == null) {
      return;
    }
    const itemMeta = selectorItemMeta(store.value, focusedItemId);
    if (itemMeta) {
      const itemElement = instance.getItemDOMElement(focusedItemId);
      if (itemElement) {
        itemElement.blur();
      }
    }
    setFocusedItemId(null);
  });
  useInstanceEventHandler(instance, 'removeItem', ({
    id
  }) => {
    const focusedItemId = selectorFocusedItemId(store.value);
    const defaultFocusableItemId = selectorDefaultFocusableItemId(store.value);
    if (focusedItemId === id && defaultFocusableItemId != null) {
      innerFocusItem(null, defaultFocusableItemId);
    }
  });
  const createRootHandleFocus = otherHandlers => event => {
    otherHandlers.onFocus?.(event);
    if (event.defaultMuiPrevented) {
      return;
    }

    // if the event bubbled (which is React specific) we don't want to steal focus
    const defaultFocusableItemId = selectorDefaultFocusableItemId(store.value);
    if (event.target === event.currentTarget && defaultFocusableItemId != null) {
      innerFocusItem(event, defaultFocusableItemId);
    }
  };
  const createRootHandleBlur = otherHandlers => event => {
    otherHandlers.onBlur?.(event);
    if (event.defaultMuiPrevented) {
      return;
    }
    setFocusedItemId(null);
  };
  return {
    getRootProps: otherHandlers => ({
      onFocus: createRootHandleFocus(otherHandlers),
      onBlur: createRootHandleBlur(otherHandlers)
    }),
    publicAPI: {
      focusItem
    },
    instance: {
      focusItem,
      removeFocusedItem
    }
  };
};
useTreeViewFocus.getInitialState = () => ({
  focus: {
    focusedItemId: null
  }
});
useTreeViewFocus.params = {
  onItemFocus: true
};