/
widget.tsx
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/
widget.tsx
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// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { showErrorMessage } from '@jupyterlab/apputils';
import {
ITranslator,
nullTranslator,
TranslationBundle
} from '@jupyterlab/translation';
import {
classes,
LabIcon,
VDomModel,
VDomRenderer
} from '@jupyterlab/ui-components';
import { ArrayExt, map } from '@lumino/algorithm';
import { CommandRegistry } from '@lumino/commands';
import { DisposableDelegate, IDisposable } from '@lumino/disposable';
import { AttachedProperty } from '@lumino/properties';
import { Widget } from '@lumino/widgets';
import * as React from 'react';
import { ILauncher } from './tokens';
/**
* The class name added to Launcher instances.
*/
const LAUNCHER_CLASS = 'jp-Launcher';
/**
* LauncherModel keeps track of the path to working directory and has a list of
* LauncherItems, which the Launcher will render.
*/
export class LauncherModel extends VDomModel implements ILauncher.IModel {
/**
* Add a command item to the launcher, and trigger re-render event for parent
* widget.
*
* @param options - The specification options for a launcher item.
*
* @returns A disposable that will remove the item from Launcher, and trigger
* re-render event for parent widget.
*
*/
add(options: ILauncher.IItemOptions): IDisposable {
// Create a copy of the options to circumvent mutations to the original.
const item = Private.createItem(options);
this.itemsList.push(item);
this.stateChanged.emit(void 0);
return new DisposableDelegate(() => {
ArrayExt.removeFirstOf(this.itemsList, item);
this.stateChanged.emit(void 0);
});
}
/**
* Return an iterator of launcher items.
*/
items(): IterableIterator<ILauncher.IItemOptions> {
return this.itemsList[Symbol.iterator]();
}
protected itemsList: ILauncher.IItemOptions[] = [];
}
/**
* A virtual-DOM-based widget for the Launcher.
*/
export class Launcher extends VDomRenderer<ILauncher.IModel> {
/**
* Construct a new launcher widget.
*/
constructor(options: ILauncher.IOptions) {
super(options.model);
this._cwd = options.cwd;
this.translator = options.translator || nullTranslator;
this._trans = this.translator.load('jupyterlab');
this._callback = options.callback;
this._commands = options.commands;
this.addClass(LAUNCHER_CLASS);
}
/**
* The cwd of the launcher.
*/
get cwd(): string {
return this._cwd;
}
set cwd(value: string) {
this._cwd = value;
this.update();
}
/**
* Whether there is a pending item being launched.
*/
get pending(): boolean {
return this._pending;
}
set pending(value: boolean) {
this._pending = value;
}
/**
* Render the launcher to virtual DOM nodes.
*/
protected render(): React.ReactElement<any> | null {
// Bail if there is no model.
if (!this.model) {
return null;
}
const knownCategories = [
this._trans.__('Notebook'),
this._trans.__('Console'),
this._trans.__('Other')
];
const kernelCategories = [
this._trans.__('Notebook'),
this._trans.__('Console')
];
// First group-by categories
const categories = Object.create(null);
for (const item of this.model.items()) {
const cat = item.category || this._trans.__('Other');
if (!(cat in categories)) {
categories[cat] = [];
}
categories[cat].push(item);
}
// Within each category sort by rank
for (const cat in categories) {
categories[cat] = categories[cat].sort(
(a: ILauncher.IItemOptions, b: ILauncher.IItemOptions) => {
return Private.sortCmp(a, b, this._cwd, this._commands);
}
);
}
// Variable to help create sections
const sections: React.ReactElement<any>[] = [];
let section: React.ReactElement<any>;
// Assemble the final ordered list of categories, beginning with
// KNOWN_CATEGORIES.
const orderedCategories: string[] = [];
for (const cat of knownCategories) {
orderedCategories.push(cat);
}
for (const cat in categories) {
if (knownCategories.indexOf(cat) === -1) {
orderedCategories.push(cat);
}
}
// Now create the sections for each category
orderedCategories.forEach(cat => {
if (!categories[cat]) {
return;
}
const item = categories[cat][0] as ILauncher.IItemOptions;
const args = { ...item.args, cwd: this.cwd };
const kernel = kernelCategories.indexOf(cat) > -1;
const iconClass = this._commands.iconClass(item.command, args);
const icon = this._commands.icon(item.command, args);
if (cat in categories) {
section = (
<div className="jp-Launcher-section" key={cat}>
<div className="jp-Launcher-sectionHeader">
<LabIcon.resolveReact
icon={icon}
iconClass={classes(iconClass, 'jp-Icon-cover')}
stylesheet="launcherSection"
aria-hidden="true"
/>
<h2 className="jp-Launcher-sectionTitle">{cat}</h2>
</div>
<div className="jp-Launcher-cardContainer">
{Array.from(
map(categories[cat], (item: ILauncher.IItemOptions) => {
return Card(
kernel,
item,
this,
this._commands,
this._trans,
this._callback
);
})
)}
</div>
</div>
);
sections.push(section);
}
});
// Wrap the sections in body and content divs.
return (
<div className="jp-Launcher-body">
<div className="jp-Launcher-content">
<div className="jp-Launcher-cwd">
<h3>{this.cwd}</h3>
</div>
{sections}
</div>
</div>
);
}
protected translator: ITranslator;
private _trans: TranslationBundle;
private _commands: CommandRegistry;
private _callback: (widget: Widget) => void;
private _pending = false;
private _cwd = '';
}
/**
* A pure tsx component for a launcher card.
*
* @param kernel - whether the item takes uses a kernel.
*
* @param item - the launcher item to render.
*
* @param launcher - the Launcher instance to which this is added.
*
* @param commands - the command registry holding the command of item.
*
* @param trans - the translation bundle.
*
* @returns a vdom `VirtualElement` for the launcher card.
*/
function Card(
kernel: boolean,
item: ILauncher.IItemOptions,
launcher: Launcher,
commands: CommandRegistry,
trans: TranslationBundle,
launcherCallback: (widget: Widget) => void
): React.ReactElement<any> {
// Get some properties of the command
const command = item.command;
const args = { ...item.args, cwd: launcher.cwd };
const caption = commands.caption(command, args);
const label = commands.label(command, args);
const title = kernel ? label : caption || label;
// Build the onclick handler.
const onclick = () => {
// If an item has already been launched,
// don't try to launch another.
if (launcher.pending === true) {
return;
}
launcher.pending = true;
void commands
.execute(command, {
...item.args,
cwd: launcher.cwd
})
.then(value => {
launcher.pending = false;
if (value instanceof Widget) {
launcherCallback(value);
}
})
.catch(err => {
console.error(err);
launcher.pending = false;
void showErrorMessage(trans._p('Error', 'Launcher Error'), err);
});
};
// With tabindex working, you can now pick a kernel by tabbing around and
// pressing Enter.
const onkeypress = (event: React.KeyboardEvent) => {
if (event.key === 'Enter') {
onclick();
}
};
const iconClass = commands.iconClass(command, args);
const icon = commands.icon(command, args);
// Return the VDOM element.
return (
<div
className="jp-LauncherCard"
title={title}
onClick={onclick}
onKeyPress={onkeypress}
tabIndex={0}
data-category={item.category || trans.__('Other')}
key={Private.keyProperty.get(item)}
>
<div className="jp-LauncherCard-icon">
{kernel ? (
item.kernelIconUrl ? (
<img
src={item.kernelIconUrl}
className="jp-Launcher-kernelIcon"
alt={title}
/>
) : (
<div className="jp-LauncherCard-noKernelIcon">
{label[0].toUpperCase()}
</div>
)
) : (
<LabIcon.resolveReact
icon={icon}
iconClass={classes(iconClass, 'jp-Icon-cover')}
stylesheet="launcherCard"
/>
)}
</div>
<div className="jp-LauncherCard-label" title={title}>
<p>{label}</p>
</div>
</div>
);
}
/**
* The namespace for module private data.
*/
namespace Private {
/**
* An incrementing counter for keys.
*/
let id = 0;
/**
* An attached property for an item's key.
*/
export const keyProperty = new AttachedProperty<
ILauncher.IItemOptions,
number
>({
name: 'key',
create: () => id++
});
/**
* Create a fully specified item given item options.
*/
export function createItem(
options: ILauncher.IItemOptions
): ILauncher.IItemOptions {
return {
...options,
category: options.category || '',
rank: options.rank !== undefined ? options.rank : Infinity
};
}
/**
* A sort comparison function for a launcher item.
*/
export function sortCmp(
a: ILauncher.IItemOptions,
b: ILauncher.IItemOptions,
cwd: string,
commands: CommandRegistry
): number {
// First, compare by rank.
const r1 = a.rank;
const r2 = b.rank;
if (r1 !== r2 && r1 !== undefined && r2 !== undefined) {
return r1 < r2 ? -1 : 1; // Infinity safe
}
// Finally, compare by display name.
const aLabel = commands.label(a.command, { ...a.args, cwd });
const bLabel = commands.label(b.command, { ...b.args, cwd });
return aLabel.localeCompare(bLabel);
}
}