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celltools.ts
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celltools.ts
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// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { ArrayExt, each } from '@phosphor/algorithm';
import { JSONObject, JSONValue, Token } from '@phosphor/coreutils';
import { ConflatableMessage, Message, MessageLoop } from '@phosphor/messaging';
import { h, VirtualDOM, VirtualNode } from '@phosphor/virtualdom';
import { PanelLayout, Widget } from '@phosphor/widgets';
import { Styling } from '@jupyterlab/apputils';
import { Cell, ICellModel } from '@jupyterlab/cells';
import {
CodeEditor,
CodeEditorWrapper,
JSONEditor
} from '@jupyterlab/codeeditor';
import { nbformat } from '@jupyterlab/coreutils';
import { IObservableMap, ObservableJSON } from '@jupyterlab/observables';
import { INotebookTracker } from './';
/**
* The class name added to a CellTools instance.
*/
const CELLTOOLS_CLASS = 'jp-CellTools';
/**
* The class name added to a CellTools tool.
*/
const CHILD_CLASS = 'jp-CellTools-tool';
/**
* The class name added to a CellTools active cell.
*/
const ACTIVE_CELL_CLASS = 'jp-ActiveCellTool';
/**
* The class name added to an Editor instance.
*/
const EDITOR_CLASS = 'jp-MetadataEditorTool';
/**
* The class name added to a KeySelector instance.
*/
const KEYSELECTOR_CLASS = 'jp-KeySelector';
/* tslint:disable */
/**
* The main menu token.
*/
export const ICellTools = new Token<ICellTools>(
'@jupyterlab/notebook:ICellTools'
);
/* tslint:enable */
/**
* The interface for cell metadata tools.
*/
export interface ICellTools extends CellTools {}
/**
* A widget that provides cell metadata tools.
*/
export class CellTools extends Widget {
/**
* Construct a new CellTools object.
*/
constructor(options: CellTools.IOptions) {
super();
this.addClass(CELLTOOLS_CLASS);
this.layout = new PanelLayout();
this._tracker = options.tracker;
this._tracker.activeCellChanged.connect(this._onActiveCellChanged, this);
this._tracker.selectionChanged.connect(this._onSelectionChanged, this);
this._onActiveCellChanged();
this._onSelectionChanged();
}
/**
* The active cell widget.
*/
get activeCell(): Cell | null {
return this._tracker.activeCell;
}
/**
* The currently selected cells.
*/
get selectedCells(): Cell[] {
let selected: Cell[] = [];
let panel = this._tracker.currentWidget;
if (!panel) {
return selected;
}
each(panel.content.widgets, widget => {
if (panel.content.isSelectedOrActive(widget)) {
selected.push(widget);
}
});
return selected;
}
/**
* Add a cell tool item.
*/
addItem(options: CellTools.IAddOptions): void {
let tool = options.tool;
let rank = 'rank' in options ? options.rank : 100;
let rankItem = { tool, rank };
let index = ArrayExt.upperBound(this._items, rankItem, Private.itemCmp);
tool.addClass(CHILD_CLASS);
// Add the tool.
ArrayExt.insert(this._items, index, rankItem);
let layout = this.layout as PanelLayout;
layout.insertWidget(index, tool);
// Trigger the tool to update its active cell.
MessageLoop.sendMessage(tool, CellTools.ActiveCellMessage);
}
/**
* Handle the removal of a child
*/
protected onChildRemoved(msg: Widget.ChildMessage): void {
let index = ArrayExt.findFirstIndex(
this._items,
item => item.tool === msg.child
);
if (index !== -1) {
ArrayExt.removeAt(this._items, index);
}
}
/**
* Handle a change to the active cell.
*/
private _onActiveCellChanged(): void {
if (this._prevActive && !this._prevActive.isDisposed) {
this._prevActive.metadata.changed.disconnect(
this._onMetadataChanged,
this
);
}
let activeCell = this._tracker.activeCell;
this._prevActive = activeCell ? activeCell.model : null;
if (activeCell) {
activeCell.model.metadata.changed.connect(this._onMetadataChanged, this);
}
each(this.children(), widget => {
MessageLoop.sendMessage(widget, CellTools.ActiveCellMessage);
});
}
/**
* Handle a change in the selection.
*/
private _onSelectionChanged(): void {
each(this.children(), widget => {
MessageLoop.sendMessage(widget, CellTools.SelectionMessage);
});
}
/**
* Handle a change in the metadata.
*/
private _onMetadataChanged(
sender: IObservableMap<JSONValue>,
args: IObservableMap.IChangedArgs<JSONValue>
): void {
let message = new ObservableJSON.ChangeMessage(args);
each(this.children(), widget => {
MessageLoop.sendMessage(widget, message);
});
}
private _items: Private.IRankItem[] = [];
private _tracker: INotebookTracker;
private _prevActive: ICellModel | null;
}
/**
* The namespace for CellTools class statics.
*/
export namespace CellTools {
/**
* The options used to create a CellTools object.
*/
export interface IOptions {
/**
* The notebook tracker used by the cell tools.
*/
tracker: INotebookTracker;
}
/**
* The options used to add an item to the cell tools.
*/
export interface IAddOptions {
/**
* The tool to add to the cell tools area.
*/
tool: Tool;
/**
* The rank order of the widget among its siblings.
*/
rank?: number;
}
/**
* A singleton conflatable `'activecell-changed'` message.
*/
// tslint:disable-next-line
export const ActiveCellMessage = new ConflatableMessage('activecell-changed');
/**
* A singleton conflatable `'selection-changed'` message.
*/
// tslint:disable-next-line
export const SelectionMessage = new ConflatableMessage('selection-changed');
/**
* The base cell tool, meant to be subclassed.
*/
export class Tool extends Widget {
/**
* The cell tools object.
*/
readonly parent: ICellTools;
/**
* Process a message sent to the widget.
*
* @param msg - The message sent to the widget.
*/
processMessage(msg: Message): void {
super.processMessage(msg);
switch (msg.type) {
case 'activecell-changed':
this.onActiveCellChanged(msg);
break;
case 'selection-changed':
this.onSelectionChanged(msg);
break;
case 'jsonvalue-changed':
this.onMetadataChanged(msg as ObservableJSON.ChangeMessage);
break;
default:
break;
}
}
/**
* Handle a change to the active cell.
*
* #### Notes
* The default implementation is a no-op.
*/
protected onActiveCellChanged(msg: Message): void {
/* no-op */
}
/**
* Handle a change to the selection.
*
* #### Notes
* The default implementation is a no-op.
*/
protected onSelectionChanged(msg: Message): void {
/* no-op */
}
/**
* Handle a change to the metadata of the active cell.
*
* #### Notes
* The default implementation is a no-op.
*/
protected onMetadataChanged(msg: ObservableJSON.ChangeMessage): void {
/* no-op */
}
}
/**
* A cell tool displaying the active cell contents.
*/
export class ActiveCellTool extends Tool {
/**
* Construct a new active cell tool.
*/
constructor() {
super();
this.addClass(ACTIVE_CELL_CLASS);
this.addClass('jp-InputArea');
this.layout = new PanelLayout();
}
/**
* Dispose of the resources used by the tool.
*/
dispose() {
if (this._model === null) {
return;
}
this._model.dispose();
this._model = null;
super.dispose();
}
/**
* Handle a change to the active cell.
*/
protected onActiveCellChanged(): void {
let activeCell = this.parent.activeCell;
let layout = this.layout as PanelLayout;
let count = layout.widgets.length;
for (let i = 0; i < count; i++) {
layout.widgets[0].dispose();
}
if (this._cellModel && !this._cellModel.isDisposed) {
this._cellModel.value.changed.disconnect(this._onValueChanged, this);
this._cellModel.mimeTypeChanged.disconnect(
this._onMimeTypeChanged,
this
);
}
if (!activeCell) {
let cell = new Widget();
cell.addClass('jp-InputArea-editor');
cell.addClass('jp-InputArea-editor');
layout.addWidget(cell);
this._cellModel = null;
return;
}
let promptNode = activeCell.promptNode
? (activeCell.promptNode.cloneNode(true) as HTMLElement)
: null;
let prompt = new Widget({ node: promptNode });
let factory = activeCell.contentFactory.editorFactory;
let cellModel = (this._cellModel = activeCell.model);
cellModel.value.changed.connect(this._onValueChanged, this);
cellModel.mimeTypeChanged.connect(this._onMimeTypeChanged, this);
this._model.value.text = cellModel.value.text.split('\n')[0];
this._model.mimeType = cellModel.mimeType;
let model = this._model;
let editorWidget = new CodeEditorWrapper({ model, factory });
editorWidget.addClass('jp-InputArea-editor');
editorWidget.addClass('jp-InputArea-editor');
editorWidget.editor.setOption('readOnly', true);
layout.addWidget(prompt);
layout.addWidget(editorWidget);
}
/**
* Handle a change to the current editor value.
*/
private _onValueChanged(): void {
this._model.value.text = this._cellModel.value.text.split('\n')[0];
}
/**
* Handle a change to the current editor mimetype.
*/
private _onMimeTypeChanged(): void {
this._model.mimeType = this._cellModel.mimeType;
}
private _model = new CodeEditor.Model();
private _cellModel: CodeEditor.IModel;
}
/**
* A raw metadata editor.
*/
export class MetadataEditorTool extends Tool {
/**
* Construct a new raw metadata tool.
*/
constructor(options: MetadataEditorTool.IOptions) {
super();
let editorFactory = options.editorFactory;
this.addClass(EDITOR_CLASS);
let layout = (this.layout = new PanelLayout());
this.editor = new JSONEditor({
editorFactory,
title: 'Edit Metadata',
collapsible: true
});
layout.addWidget(this.editor);
}
/**
* The editor used by the tool.
*/
readonly editor: JSONEditor;
/**
* Handle a change to the active cell.
*/
protected onActiveCellChanged(msg: Message): void {
let cell = this.parent.activeCell;
this.editor.source = cell ? cell.model.metadata : null;
}
}
/**
* The namespace for `MetadataEditorTool` static data.
*/
export namespace MetadataEditorTool {
/**
* The options used to initialize a metadata editor tool.
*/
export interface IOptions {
/**
* The editor factory used by the tool.
*/
editorFactory: CodeEditor.Factory;
}
}
/**
* A cell tool that provides a selection for a given metadata key.
*/
export class KeySelector extends Tool {
/**
* Construct a new KeySelector.
*/
constructor(options: KeySelector.IOptions) {
super({ node: Private.createSelectorNode(options) });
this.addClass(KEYSELECTOR_CLASS);
this.key = options.key;
this._validCellTypes = options.validCellTypes || [];
this._getter = options.getter || this._getValue;
this._setter = options.setter || this._setValue;
}
/**
* The metadata key used by the selector.
*/
readonly key: string;
/**
* The select node for the widget.
*/
get selectNode(): HTMLSelectElement {
return this.node.getElementsByTagName('select')[0] as HTMLSelectElement;
}
/**
* Handle the DOM events for the widget.
*
* @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 notebook panel's node. It should
* not be called directly by user code.
*/
handleEvent(event: Event): void {
switch (event.type) {
case 'change':
this.onValueChanged();
break;
default:
break;
}
}
/**
* Handle `after-attach` messages for the widget.
*/
protected onAfterAttach(msg: Message): void {
let node = this.selectNode;
node.addEventListener('change', this);
}
/**
* Handle `before-detach` messages for the widget.
*/
protected onBeforeDetach(msg: Message): void {
let node = this.selectNode;
node.removeEventListener('change', this);
}
/**
* Handle a change to the active cell.
*/
protected onActiveCellChanged(msg: Message): void {
let select = this.selectNode;
let activeCell = this.parent.activeCell;
if (!activeCell) {
select.disabled = true;
select.value = '';
return;
}
let cellType = activeCell.model.type;
if (
this._validCellTypes.length &&
this._validCellTypes.indexOf(cellType) === -1
) {
select.disabled = true;
return;
}
select.disabled = false;
this._changeGuard = true;
let getter = this._getter;
select.value = JSON.stringify(getter(activeCell));
this._changeGuard = false;
}
/**
* Handle a change to the metadata of the active cell.
*/
protected onMetadataChanged(msg: ObservableJSON.ChangeMessage) {
if (this._changeGuard) {
return;
}
let select = this.selectNode;
let cell = this.parent.activeCell;
if (msg.args.key === this.key && cell) {
this._changeGuard = true;
let getter = this._getter;
select.value = JSON.stringify(getter(cell));
this._changeGuard = false;
}
}
/**
* Handle a change to the value.
*/
protected onValueChanged(): void {
let activeCell = this.parent.activeCell;
if (!activeCell || this._changeGuard) {
return;
}
this._changeGuard = true;
let select = this.selectNode;
let setter = this._setter;
setter(activeCell, JSON.parse(select.value));
this._changeGuard = false;
}
/**
* Get the value for the data.
*/
private _getValue = (cell: Cell) => {
return cell.model.metadata.get(this.key);
};
/**
* Set the value for the data.
*/
private _setValue = (cell: Cell, value: JSONValue) => {
cell.model.metadata.set(this.key, value);
};
private _changeGuard = false;
private _validCellTypes: string[];
private _getter: (cell: Cell) => JSONValue;
private _setter: (cell: Cell, value: JSONValue) => void;
}
/**
* The namespace for `KeySelector` static data.
*/
export namespace KeySelector {
/**
* The options used to initialize a keyselector.
*/
export interface IOptions {
/**
* The metadata key of interest.
*/
key: string;
/**
* The map of options to values.
*/
optionsMap: { [key: string]: JSONValue };
/**
* The optional title of the selector - defaults to capitalized `key`.
*/
title?: string;
/**
* The optional valid cell types - defaults to all valid types.
*/
validCellTypes?: nbformat.CellType[];
/**
* An optional value getter for the selector.
*
* @param cell - The currently active cell.
*
* @returns The appropriate value for the selector.
*/
getter?: (cell: Cell) => JSONValue;
/**
* An optional value setter for the selector.
*
* @param cell - The currently active cell.
*
* @param value - The value of the selector.
*
* #### Notes
* The setter should set the appropriate metadata value
* given the value of the selector.
*/
setter?: (cell: Cell, value: JSONValue) => void;
}
}
/**
* Create a slideshow selector.
*/
export function createSlideShowSelector(): KeySelector {
let options: KeySelector.IOptions = {
key: 'slideshow',
title: 'Slide Type',
optionsMap: {
'-': '-',
Slide: 'slide',
'Sub-Slide': 'subslide',
Fragment: 'fragment',
Skip: 'skip',
Notes: 'notes'
},
getter: cell => {
let value = cell.model.metadata.get('slideshow');
return value && (value as JSONObject)['slide_type'];
},
setter: (cell, value) => {
let data = cell.model.metadata.get('slideshow') || Object.create(null);
data = { ...data, slide_type: value };
cell.model.metadata.set('slideshow', data);
}
};
return new KeySelector(options);
}
/**
* Create an nbcovert selector.
*/
export function createNBConvertSelector(): KeySelector {
return new KeySelector({
key: 'raw_mimetype',
title: 'Raw NBConvert Format',
optionsMap: {
None: '-',
LaTeX: 'text/latex',
reST: 'text/restructuredtext',
HTML: 'text/html',
Markdown: 'text/markdown',
Python: 'text/x-python'
},
validCellTypes: ['raw']
});
}
}
/**
* A namespace for private data.
*/
namespace Private {
/**
* An object which holds a widget and its sort rank.
*/
export interface IRankItem {
/**
* The widget for the item.
*/
tool: CellTools.Tool;
/**
* The sort rank of the menu.
*/
rank: number;
}
/**
* A comparator function for widget rank items.
*/
export function itemCmp(first: IRankItem, second: IRankItem): number {
return first.rank - second.rank;
}
/**
* Create the node for a KeySelector.
*/
export function createSelectorNode(
options: CellTools.KeySelector.IOptions
): HTMLElement {
let name = options.key;
let title = options.title || name[0].toLocaleUpperCase() + name.slice(1);
let optionNodes: VirtualNode[] = [];
for (let label in options.optionsMap) {
let value = JSON.stringify(options.optionsMap[label]);
optionNodes.push(h.option({ value }, label));
}
let node = VirtualDOM.realize(
h.div({}, h.label(title), h.select({}, optionNodes))
);
Styling.styleNode(node);
return node;
}
}