@jupyterlab/filebrowser/lib/crumbs.js

// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { DOMUtils, showErrorMessage } from '@jupyterlab/apputils';
import { PageConfig, PathExt } from '@jupyterlab/coreutils';
import { renameFile } from '@jupyterlab/docmanager';
import { nullTranslator } from '@jupyterlab/translation';
import { ellipsesIcon, homeIcon as preferredIcon, folderIcon as rootIcon } from '@jupyterlab/ui-components';
import { ArrayExt } from '@lumino/algorithm';
import { JSONExt } from '@lumino/coreutils';
import { ElementExt } from '@lumino/domutils';
import { Widget } from '@lumino/widgets';
/**
 * The class name added to the breadcrumb node.
 */
const BREADCRUMB_CLASS = 'jp-BreadCrumbs';
/**
 * The class name for the breadcrumbs home node
 */
const BREADCRUMB_ROOT_CLASS = 'jp-BreadCrumbs-home';
/**
 * The class name for the breadcrumbs preferred node
 */
const BREADCRUMB_PREFERRED_CLASS = 'jp-BreadCrumbs-preferred';
/**
 * The class name added to the breadcrumb node.
 */
const BREADCRUMB_ITEM_CLASS = 'jp-BreadCrumbs-item';
/**
 * Bread crumb paths.
 */
const BREAD_CRUMB_PATHS = ['/', '../../', '../', ''];
/**
 * The mime type for a contents drag object.
 */
const CONTENTS_MIME = 'application/x-jupyter-icontents';
/**
 * The class name added to drop targets.
 */
const DROP_TARGET_CLASS = 'jp-mod-dropTarget';
/**
 * A class which hosts folder breadcrumbs.
 */
export class BreadCrumbs extends Widget {
    /**
     * Construct a new file browser crumb widget.
     *
     * @param model - The file browser view model.
     */
    constructor(options) {
        super();
        this._previousState = null;
        this.translator = options.translator || nullTranslator;
        this._trans = this.translator.load('jupyterlab');
        this._model = options.model;
        this._fullPath = options.fullPath || false;
        this.addClass(BREADCRUMB_CLASS);
        this._crumbs = Private.createCrumbs();
        this._crumbSeps = Private.createCrumbSeparators();
        const hasPreferred = PageConfig.getOption('preferredPath');
        this._hasPreferred = hasPreferred && hasPreferred !== '/' ? true : false;
        if (this._hasPreferred) {
            this.node.appendChild(this._crumbs[Private.Crumb.Preferred]);
        }
        this.node.appendChild(this._crumbs[Private.Crumb.Home]);
        this._model.refreshed.connect(this.update, this);
    }
    /**
     * Handle the DOM events for the bread crumbs.
     *
     * @param event - The DOM event sent to the widget.
     *
     * #### Notes
     * This method implements the DOM `EventListener` interface and is
     * called in response to events on the panel's DOM node. It should
     * not be called directly by user code.
     */
    handleEvent(event) {
        switch (event.type) {
            case 'click':
                this._evtClick(event);
                break;
            case 'lm-dragenter':
                this._evtDragEnter(event);
                break;
            case 'lm-dragleave':
                this._evtDragLeave(event);
                break;
            case 'lm-dragover':
                this._evtDragOver(event);
                break;
            case 'lm-drop':
                this._evtDrop(event);
                break;
            default:
                return;
        }
    }
    /**
     * Whether to show the full path in the breadcrumbs
     */
    get fullPath() {
        return this._fullPath;
    }
    set fullPath(value) {
        this._fullPath = value;
    }
    /**
     * A message handler invoked on an `'after-attach'` message.
     */
    onAfterAttach(msg) {
        super.onAfterAttach(msg);
        this.update();
        const node = this.node;
        node.addEventListener('click', this);
        node.addEventListener('lm-dragenter', this);
        node.addEventListener('lm-dragleave', this);
        node.addEventListener('lm-dragover', this);
        node.addEventListener('lm-drop', this);
    }
    /**
     * A message handler invoked on a `'before-detach'` message.
     */
    onBeforeDetach(msg) {
        super.onBeforeDetach(msg);
        const node = this.node;
        node.removeEventListener('click', this);
        node.removeEventListener('lm-dragenter', this);
        node.removeEventListener('lm-dragleave', this);
        node.removeEventListener('lm-dragover', this);
        node.removeEventListener('lm-drop', this);
    }
    /**
     * A handler invoked on an `'update-request'` message.
     */
    onUpdateRequest(msg) {
        // Update the breadcrumb list.
        const contents = this._model.manager.services.contents;
        const localPath = contents.localPath(this._model.path);
        const state = {
            path: localPath,
            hasPreferred: this._hasPreferred,
            fullPath: this._fullPath
        };
        if (this._previousState && JSONExt.deepEqual(state, this._previousState)) {
            return;
        }
        this._previousState = state;
        Private.updateCrumbs(this._crumbs, this._crumbSeps, state);
    }
    /**
     * Handle the `'click'` event for the widget.
     */
    _evtClick(event) {
        // Do nothing if it's not a left mouse press.
        if (event.button !== 0) {
            return;
        }
        // Find a valid click target.
        let node = event.target;
        while (node && node !== this.node) {
            if (node.classList.contains(BREADCRUMB_PREFERRED_CLASS)) {
                this._model
                    .cd(PageConfig.getOption('preferredPath'))
                    .catch(error => showErrorMessage(this._trans.__('Open Error'), error));
                // Stop the event propagation.
                event.preventDefault();
                event.stopPropagation();
                return;
            }
            if (node.classList.contains(BREADCRUMB_ITEM_CLASS) ||
                node.classList.contains(BREADCRUMB_ROOT_CLASS)) {
                let index = ArrayExt.findFirstIndex(this._crumbs, value => value === node);
                let destination = BREAD_CRUMB_PATHS[index];
                if (this._fullPath &&
                    index < 0 &&
                    !node.classList.contains(BREADCRUMB_ROOT_CLASS)) {
                    destination = node.title;
                }
                this._model
                    .cd(destination)
                    .catch(error => showErrorMessage(this._trans.__('Open Error'), error));
                // Stop the event propagation.
                event.preventDefault();
                event.stopPropagation();
                return;
            }
            node = node.parentElement;
        }
    }
    /**
     * Handle the `'lm-dragenter'` event for the widget.
     */
    _evtDragEnter(event) {
        if (event.mimeData.hasData(CONTENTS_MIME)) {
            const index = ArrayExt.findFirstIndex(this._crumbs, node => ElementExt.hitTest(node, event.clientX, event.clientY));
            if (index !== -1) {
                if (index !== Private.Crumb.Current) {
                    this._crumbs[index].classList.add(DROP_TARGET_CLASS);
                    event.preventDefault();
                    event.stopPropagation();
                }
            }
        }
    }
    /**
     * Handle the `'lm-dragleave'` event for the widget.
     */
    _evtDragLeave(event) {
        event.preventDefault();
        event.stopPropagation();
        const dropTarget = DOMUtils.findElement(this.node, DROP_TARGET_CLASS);
        if (dropTarget) {
            dropTarget.classList.remove(DROP_TARGET_CLASS);
        }
    }
    /**
     * Handle the `'lm-dragover'` event for the widget.
     */
    _evtDragOver(event) {
        event.preventDefault();
        event.stopPropagation();
        event.dropAction = event.proposedAction;
        const dropTarget = DOMUtils.findElement(this.node, DROP_TARGET_CLASS);
        if (dropTarget) {
            dropTarget.classList.remove(DROP_TARGET_CLASS);
        }
        const index = ArrayExt.findFirstIndex(this._crumbs, node => ElementExt.hitTest(node, event.clientX, event.clientY));
        if (index !== -1) {
            this._crumbs[index].classList.add(DROP_TARGET_CLASS);
        }
    }
    /**
     * Handle the `'lm-drop'` event for the widget.
     */
    _evtDrop(event) {
        event.preventDefault();
        event.stopPropagation();
        if (event.proposedAction === 'none') {
            event.dropAction = 'none';
            return;
        }
        if (!event.mimeData.hasData(CONTENTS_MIME)) {
            return;
        }
        event.dropAction = event.proposedAction;
        let target = event.target;
        while (target && target.parentElement) {
            if (target.classList.contains(DROP_TARGET_CLASS)) {
                target.classList.remove(DROP_TARGET_CLASS);
                break;
            }
            target = target.parentElement;
        }
        // Get the path based on the target node.
        const index = ArrayExt.findFirstIndex(this._crumbs, node => node === target);
        if (index === -1) {
            return;
        }
        const model = this._model;
        const path = PathExt.resolve(model.path, BREAD_CRUMB_PATHS[index]);
        const manager = model.manager;
        // Move all of the items.
        const promises = [];
        const oldPaths = event.mimeData.getData(CONTENTS_MIME);
        for (const oldPath of oldPaths) {
            const localOldPath = manager.services.contents.localPath(oldPath);
            const name = PathExt.basename(localOldPath);
            const newPath = PathExt.join(path, name);
            promises.push(renameFile(manager, oldPath, newPath));
        }
        void Promise.all(promises).catch(err => {
            return showErrorMessage(this._trans.__('Move Error'), err);
        });
    }
}
/**
 * The namespace for the crumbs private data.
 */
var Private;
(function (Private) {
    /**
     * Breadcrumb item list enum.
     */
    let Crumb;
    (function (Crumb) {
        Crumb[Crumb["Home"] = 0] = "Home";
        Crumb[Crumb["Ellipsis"] = 1] = "Ellipsis";
        Crumb[Crumb["Parent"] = 2] = "Parent";
        Crumb[Crumb["Current"] = 3] = "Current";
        Crumb[Crumb["Preferred"] = 4] = "Preferred";
    })(Crumb = Private.Crumb || (Private.Crumb = {}));
    /**
     * Populate the breadcrumb node.
     */
    function updateCrumbs(breadcrumbs, separators, state) {
        const node = breadcrumbs[0].parentNode;
        // Remove all but the home or preferred node.
        const firstChild = node.firstChild;
        while (firstChild && firstChild.nextSibling) {
            node.removeChild(firstChild.nextSibling);
        }
        if (state.hasPreferred) {
            node.appendChild(breadcrumbs[Crumb.Home]);
            node.appendChild(separators[0]);
        }
        else {
            node.appendChild(separators[0]);
        }
        const parts = state.path.split('/');
        if (!state.fullPath && parts.length > 2) {
            node.appendChild(breadcrumbs[Crumb.Ellipsis]);
            const grandParent = parts.slice(0, parts.length - 2).join('/');
            breadcrumbs[Crumb.Ellipsis].title = grandParent;
            node.appendChild(separators[1]);
        }
        if (state.path) {
            if (!state.fullPath) {
                if (parts.length >= 2) {
                    breadcrumbs[Crumb.Parent].textContent = parts[parts.length - 2];
                    node.appendChild(breadcrumbs[Crumb.Parent]);
                    const parent = parts.slice(0, parts.length - 1).join('/');
                    breadcrumbs[Crumb.Parent].title = parent;
                    node.appendChild(separators[2]);
                }
                breadcrumbs[Crumb.Current].textContent = parts[parts.length - 1];
                node.appendChild(breadcrumbs[Crumb.Current]);
                breadcrumbs[Crumb.Current].title = state.path;
                node.appendChild(separators[3]);
            }
            else {
                for (let i = 0; i < parts.length; i++) {
                    const elem = document.createElement('span');
                    elem.className = BREADCRUMB_ITEM_CLASS;
                    elem.textContent = parts[i];
                    const elemPath = `/${parts.slice(0, i + 1).join('/')}`;
                    elem.title = elemPath;
                    node.appendChild(elem);
                    const separator = document.createElement('span');
                    separator.textContent = '/';
                    node.appendChild(separator);
                }
            }
        }
    }
    Private.updateCrumbs = updateCrumbs;
    /**
     * Create the breadcrumb nodes.
     */
    function createCrumbs() {
        const home = rootIcon.element({
            className: BREADCRUMB_ROOT_CLASS,
            tag: 'span',
            title: PageConfig.getOption('serverRoot') || 'Jupyter Server Root',
            stylesheet: 'breadCrumb'
        });
        const ellipsis = ellipsesIcon.element({
            className: BREADCRUMB_ITEM_CLASS,
            tag: 'span',
            stylesheet: 'breadCrumb'
        });
        const parent = document.createElement('span');
        parent.className = BREADCRUMB_ITEM_CLASS;
        const current = document.createElement('span');
        current.className = BREADCRUMB_ITEM_CLASS;
        const preferred = preferredIcon.element({
            className: BREADCRUMB_PREFERRED_CLASS,
            tag: 'span',
            title: PageConfig.getOption('preferredPath') || 'Jupyter Preferred Path',
            stylesheet: 'breadCrumb'
        });
        return [home, ellipsis, parent, current, preferred];
    }
    Private.createCrumbs = createCrumbs;
    /**
     * Create the breadcrumb separator nodes.
     */
    function createCrumbSeparators() {
        const items = [];
        // The maximum number of directories that will be shown in the crumbs
        const MAX_DIRECTORIES = 2;
        // Make separators for after each directory, one at the beginning, and one
        // after a possible ellipsis.
        for (let i = 0; i < MAX_DIRECTORIES + 2; i++) {
            const item = document.createElement('span');
            item.textContent = '/';
            items.push(item);
        }
        return items;
    }
    Private.createCrumbSeparators = createCrumbSeparators;
})(Private || (Private = {}));
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