@krassowski/jupyterlab_go_to_definition/lib/notebook_private.js

Jump to definition of a variable or function in JupyterLab

// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { ArrayExt } from '@lumino/algorithm';
/**
 * Ensure that the notebook has proper focus.
 */
function _ensureFocus(notebook, force = false) {
    let activeCell = notebook.activeCell;
    if (notebook.mode === 'edit' && activeCell) {
        if (!activeCell.editor.hasFocus()) {
            activeCell.editor.focus();
        }
    }
    if (force && !notebook.node.contains(document.activeElement)) {
        notebook.node.focus();
    }
}
/**
 * The class name added to notebook widget cells.
 */
const NB_CELL_CLASS = 'jp-Notebook-cell';
/**
 * Find the cell index containing the target html element.
 *
 * #### Notes
 * Returns -1 if the cell is not found.
 */
function _findCell(notebook, node) {
    // Trace up the DOM hierarchy to find the root cell node.
    // Then find the corresponding child and select it.
    while (node && node !== notebook.node) {
        if (node.classList.contains(NB_CELL_CLASS)) {
            let i = ArrayExt.findFirstIndex(notebook.widgets, widget => widget.node === node);
            if (i !== -1) {
                return i;
            }
            break;
        }
        node = node.parentElement;
    }
    return -1;
}
function _findTargetCell(notebook, event) {
    let target = event.target;
    let index = _findCell(notebook, target);
    if (index === -1) {
        // `event.target` sometimes gives an orphaned node in
        // Firefox 57, which can have `null` anywhere in its parent line. If we fail
        // to find a cell using `event.target`, try again using a target
        // reconstructed from the position of the click event.
        target = document.elementFromPoint(event.clientX, event.clientY);
        index = _findCell(notebook, target);
    }
    return { target: target, index: index };
}
export { _ensureFocus, _findCell, _findTargetCell };
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