@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 { useStableCallback } from '@base-ui/utils/useStableCallback';
import { useStoreEffect } from '@mui/x-internals/store';
import { focusSelectors } from "./useTreeViewFocus.selectors.js";
import { expansionSelectors } from "../useTreeViewExpansion/useTreeViewExpansion.selectors.js";
import { itemsSelectors } from "../useTreeViewItems/useTreeViewItems.selectors.js";
export const useTreeViewFocus = ({
  instance,
  params,
  store
}) => {
  const setFocusedItemId = useStableCallback(itemId => {
    const focusedItemId = focusSelectors.focusedItemId(store.state);
    if (focusedItemId === itemId) {
      return;
    }
    store.set('focus', _extends({}, store.state.focus, {
      focusedItemId: itemId
    }));
  });
  const isItemVisible = itemId => {
    const itemMeta = itemsSelectors.itemMeta(store.state, itemId);
    return itemMeta && (itemMeta.parentId == null || expansionSelectors.isItemExpanded(store.state, 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 = useStableCallback((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 = useStableCallback(() => {
    const focusedItemId = focusSelectors.focusedItemId(store.state);
    if (focusedItemId == null) {
      return;
    }
    const itemMeta = itemsSelectors.itemMeta(store.state, focusedItemId);
    if (itemMeta) {
      const itemElement = instance.getItemDOMElement(focusedItemId);
      if (itemElement) {
        itemElement.blur();
      }
    }
    setFocusedItemId(null);
  });

  // Whenever the items change, we need to ensure the focused item is still present.
  useStoreEffect(store, itemsSelectors.itemMetaLookup, () => {
    const focusedItemId = focusSelectors.focusedItemId(store.state);
    if (focusedItemId == null) {
      return;
    }
    const hasItemBeenRemoved = !itemsSelectors.itemMeta(store.state, focusedItemId);
    if (!hasItemBeenRemoved) {
      return;
    }
    const defaultFocusableItemId = focusSelectors.defaultFocusableItemId(store.state);
    if (defaultFocusableItemId == null) {
      setFocusedItemId(null);
      return;
    }
    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 = focusSelectors.defaultFocusableItemId(store.state);
    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
};