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import type { GlobalStyles } from '@deathbeds/jupyterlab-fonts/lib/_schema';
import {
getCellMetadata,
getPanelMetadata,
setCellMetadata,
deleteCellMetadata,
} from '@deathbeds/jupyterlab-fonts/lib/labcompat';
import { Cell, ICellModel } from '@jupyterlab/cells';
import {
INotebookModel,
INotebookTools,
Notebook,
NotebookPanel,
} from '@jupyterlab/notebook';
import { CommandRegistry } from '@lumino/commands';
import { JSONExt } from '@lumino/coreutils';
import { ElementExt } from '@lumino/domutils';
import { ISignal, Signal } from '@lumino/signaling';
import { Widget } from '@lumino/widgets';
import { getCellModels } from '../labcompat';
import {
DIRECTION,
IPresenter,
TDirection,
CSS,
IDeckManager,
TSlideType,
EMOJI,
CommandIds,
DIRECTION_KEYS,
TCanGoDirection,
COMPOUND_KEYS,
META,
ICellDeckMetadata,
TLayerScope,
} from '../tokens';
import type { Layover } from '../tools/layover';
import { NotebookMetaTools } from './metadata';
const emptyMap = Object.freeze(new Map());
const { emptyObject, emptyArray } = JSONExt;
/** An presenter for working with notebooks */
export class NotebookPresenter implements IPresenter<NotebookPanel> {
public readonly id = 'notebooks';
public readonly rank = 100;
public readonly capabilities = {
layout: true,
slideType: true,
layerScope: true,
stylePart: true,
styleDeck: true,
};
protected _manager: IDeckManager;
protected _previousActiveCellIndex: number = -1;
protected _commands: CommandRegistry;
protected _activeChanged = new Signal<IPresenter<NotebookPanel>, void>(this);
protected _extents = new Map<INotebookModel, NotebookPresenter.TExtentMap>();
protected _layers = new Map<INotebookModel, NotebookPresenter.TLayerMap>();
constructor(options: NotebookPresenter.IOptions) {
this._manager = options.manager;
this._commands = options.commands;
this._makeDeckTools(options.notebookTools);
this._addKeyBindings();
this._addWindowListeners();
}
public accepts(widget: Widget): NotebookPanel | null {
if (widget instanceof NotebookPanel) {
return widget;
}
return null;
}
public async style(panel: NotebookPanel): Promise<void> {
panel.addClass(CSS.deck);
this._manager.cacheStyle(panel.node, panel.content.node);
}
public async stop(panel: NotebookPanel): Promise<void> {
const notebookModel = panel.content.model;
if (notebookModel) {
this._extents.delete(notebookModel);
this._layers.delete(notebookModel);
}
this._removeStyle(panel);
panel.content.activeCellChanged.disconnect(this._onActiveCellChanged, this);
panel.update();
const { activeCell } = panel.content;
if (activeCell) {
setTimeout(() => {
if (this._manager.activeWidget !== panel) {
return;
}
ElementExt.scrollIntoViewIfNeeded(panel.content.node, activeCell.node);
}, 100);
}
}
public async start(panel: NotebookPanel): Promise<void> {
const { model, content: notebook } = panel;
if (model) {
const _watchPanel = async (change: any) => {
/* istanbul ignore if */
if (panel.isDisposed) {
model.stateChanged.disconnect(_watchPanel);
return;
}
await this._onActiveCellChanged(panel.content);
};
model.stateChanged.connect(_watchPanel);
}
const { model: notebookModel } = notebook;
if (notebookModel) {
notebookModel.contentChanged.connect(this._onNotebookContentChanged, this);
}
panel.content.activeCellChanged.connect(this._onActiveCellChanged, this);
await this._onActiveCellChanged(panel.content);
this._forceStyle();
}
public get activeChanged(): ISignal<IPresenter<NotebookPanel>, void> {
return this._activeChanged;
}
public getSlideType(panel: NotebookPanel): TSlideType {
let { activeCell } = panel.content;
if (activeCell) {
const meta = (getCellMetadata(activeCell.model, META.slideshow) ||
emptyObject) as any;
return (meta[META.slideType] || null) as TSlideType;
}
return null;
}
public setSlideType(panel: NotebookPanel, slideType: TSlideType): void {
let { activeCell } = panel.content;
/* istanbul ignore if */
if (!activeCell) {
return;
}
let oldMeta =
((getCellMetadata(activeCell.model, META.slideshow) || emptyObject) as Record<
string,
any
>) || null;
if (slideType == null) {
Iif (oldMeta == null) {
deleteCellMetadata(activeCell.model, META.slideshow);
} else {
setCellMetadata(activeCell.model, META.slideshow, {
...oldMeta,
[META.slideType]: slideType,
});
}
} else {
Iif (oldMeta == null) {
oldMeta = {};
}
setCellMetadata(activeCell.model, META.slideshow, {
...oldMeta,
[META.slideType]: slideType,
});
}
if (panel.content.model) {
this._onNotebookContentChanged(panel.content.model);
}
void this._onActiveCellChanged(panel.content);
}
public getLayerScope(panel: NotebookPanel): string | null {
let { activeCell } = panel.content;
if (activeCell) {
const meta = (getCellMetadata(activeCell.model, META.deck) || emptyObject) as any;
return (meta[META.layer] || null) as TLayerScope;
}
return null;
}
public setLayerScope(panel: NotebookPanel, layerScope: TLayerScope): void {
let { activeCell } = panel.content;
Iif (!activeCell) {
return;
}
let oldMeta =
((getCellMetadata(activeCell.model, META.deck) || emptyObject) as Record<
string,
any
>) || null;
if (layerScope == null) {
Iif (oldMeta == null) {
deleteCellMetadata(activeCell.model, META.deck);
} else {
setCellMetadata(activeCell.model, META.deck, {
...oldMeta,
[META.layer]: layerScope,
});
}
} else {
Iif (oldMeta == null) {
oldMeta = {};
}
setCellMetadata(activeCell.model, META.deck, {
...oldMeta,
[META.layer]: layerScope,
});
}
if (panel.content.model) {
this._onNotebookContentChanged(panel.content.model);
}
void this._onActiveCellChanged(panel.content);
}
public getPartStyles(panel: NotebookPanel): GlobalStyles | null {
let { activeCell } = panel.content;
if (!activeCell) {
return null;
}
return this._getCellStyles(activeCell);
}
public setPartStyles(panel: NotebookPanel, styles: GlobalStyles | null): void {
let { activeCell } = panel.content;
/* istanbul ignore if */
if (!activeCell) {
return;
}
return this._setCellStyles(activeCell, styles);
}
public preparePanel(panel: NotebookPanel) {
let notebook = panel.content;
let oldSetFragment = notebook.setFragment;
notebook.setFragment = async (fragment: string): Promise<void> => {
await oldSetFragment.call(notebook, fragment);
if (this._manager.activePresenter === this) {
await Promise.all(notebook.widgets.map((widget) => widget.ready));
this._activateByAnchor(notebook, fragment);
}
};
}
protected _makeDeckTools(notebookTools: INotebookTools) {
const tool = new NotebookMetaTools({ manager: this._manager, notebookTools });
notebookTools.addItem({ tool, section: 'commonToolsSection', rank: 3 });
}
protected _addWindowListeners() {
window.addEventListener('hashchange', this._onHashChange);
}
protected _onHashChange = (event: HashChangeEvent) => {
const { activeWidget } = this._manager;
const panel = activeWidget && this.accepts(activeWidget);
/* istanbul ignore if */
if (!panel) {
return;
}
const url = new URL(event.newURL);
const { hash } = url || '#';
/* istanbul ignore if */
if (hash === '#') {
return;
}
this._activateByAnchor(panel.content, hash);
};
protected _activateByAnchor(notebook: Notebook, fragment: string) {
const anchored = document.getElementById(fragment.slice(1));
/* istanbul ignore if */
if (!anchored || !notebook.node.contains(anchored)) {
return;
}
let i = -1;
let cellCount = notebook.widgets.length;
while (i < cellCount) {
i++;
let cell = notebook.widgets[i];
if (cell.node.contains(anchored)) {
notebook.activeCellIndex = i;
return;
}
}
}
protected _onNotebookContentChanged(notebookModel: INotebookModel) {
/* istanbul ignore if */
if (notebookModel.isDisposed) {
notebookModel.contentChanged.disconnect(this._onNotebookContentChanged, this);
return;
}
this._extents.delete(notebookModel);
this._layers.delete(notebookModel);
}
/** overload the stock notebook keyboard shortcuts */
protected _addKeyBindings() {
for (const direction of Object.values(DIRECTION)) {
this._commands.addKeyBinding({
command: CommandIds[direction],
keys: DIRECTION_KEYS[direction],
selector: `.${CSS.deck} .jp-Notebook.jp-mod-commandMode:focus`,
});
}
for (const [directions, keys] of COMPOUND_KEYS.entries()) {
const [direction, alternate] = directions;
this._commands.addKeyBinding({
command: CommandIds.go,
args: { direction, alternate },
keys,
selector: `.${CSS.deck} .jp-Notebook.jp-mod-commandMode:focus`,
});
}
}
public async canGo(panel: NotebookPanel): Promise<Partial<TCanGoDirection>> {
let { activeCellIndex, activeCell } = panel.content;
const notebookModel = panel.content.model;
let activeExtent: NotebookPresenter.IExtent | null = null;
if (notebookModel) {
const extents = this._getExtents(notebookModel);
activeExtent = extents.get(activeCellIndex) || null;
if (!activeExtent && activeCell) {
let meta = this._getCellDeckMetadata(activeCell.model);
if (meta.layer) {
while (!activeExtent && activeCellIndex) {
activeCellIndex--;
activeExtent = extents.get(activeCellIndex) || null;
}
}
}
}
if (activeExtent) {
const { up, down, forward, back } = activeExtent;
return {
up: up != null,
down: down != null,
forward: forward != null,
back: back != null,
};
}
return emptyObject;
}
/** move around */
public go = async (
panel: NotebookPanel,
direction: TDirection,
alternate?: TDirection,
): Promise<void> => {
const notebookModel = panel.content.model;
/* istanbul ignore if */
if (!notebookModel) {
return;
}
let { activeCellIndex, activeCell } = panel.content;
const extents = this._getExtents(notebookModel);
let activeExtent = extents.get(activeCellIndex);
Iif (!activeExtent && activeCell) {
let meta = this._getCellDeckMetadata(activeCell.model);
Iif (!meta.layer && direction === 'up') {
return;
}
while (!activeExtent && activeCellIndex) {
activeCellIndex--;
activeExtent = extents.get(activeCellIndex);
}
}
const fromExtent = activeExtent && activeExtent[direction];
const fromExtentAlternate = alternate && activeExtent && activeExtent[alternate];
if (fromExtent != null) {
panel.content.activeCellIndex = fromExtent;
} else Eif (fromExtentAlternate != null) {
panel.content.activeCellIndex = fromExtentAlternate;
} else {
console.warn(
EMOJI,
this._manager.__(
`Cannot go "%1" from cell %2`,
direction,
`${activeCellIndex}`,
),
);
}
};
protected _removeStyle(panel: NotebookPanel) {
if (panel.isDisposed) {
return;
}
const { _manager } = this;
panel.removeClass(CSS.deck);
_manager.uncacheStyle(panel.content.node, panel.node);
for (const cell of panel.content.widgets) {
cell.removeClass(CSS.layer);
cell.removeClass(CSS.onScreen);
cell.removeClass(CSS.visible);
cell.node.setAttribute('style', '');
}
}
protected async _onActiveCellChanged(notebook: Notebook): Promise<void> {
const notebookModel = notebook.model;
/* istanbul ignore if */
if (!notebookModel || this._manager.activeWidget !== notebook.parent) {
return;
}
const extents = this._getExtents(notebookModel);
const layers = this._getLayers(notebookModel, extents);
let { activeCellIndex } = notebook;
let cell = getCellModels(notebookModel)[activeCellIndex];
let layerIndex: number | null = null;
if (cell) {
let meta = this._getCellDeckMetadata(cell);
if (meta && meta.layer) {
layerIndex = activeCellIndex;
}
}
let activeExtent = extents.get(activeCellIndex);
if (!activeExtent) {
if (layerIndex == null) {
let offset = this._previousActiveCellIndex > activeCellIndex ? -1 : 1;
notebook.activeCellIndex = activeCellIndex + offset;
return;
} else {
while (activeCellIndex) {
activeCellIndex--;
activeExtent = extents.get(activeCellIndex);
if (activeExtent) {
break;
}
}
}
}
Iif (!activeExtent) {
return;
}
this._previousActiveCellIndex = activeCellIndex;
let idx = -1;
let activeLayers = layers.get(activeCellIndex) || [];
idx = -1;
let { layover } = this._manager;
let onScreen: Layover.BasePart[] = [];
for (const cell of notebook.widgets) {
idx++;
if (activeLayers.includes(idx)) {
cell.addClass(CSS.layer);
cell.addClass(CSS.onScreen);
cell.addClass(CSS.visible);
Iif (layover) {
onScreen.push(this._toLayoutPart(cell));
}
} else {
cell.removeClass(CSS.layer);
if (activeExtent.visible.includes(idx)) {
cell.addClass(CSS.visible);
cell.editorWidget?.update();
} else {
cell.removeClass(CSS.visible);
}
if (activeExtent.onScreen.includes(idx)) {
cell.addClass(CSS.onScreen);
if (layover) {
onScreen.push(this._toLayoutPart(cell));
}
} else {
cell.removeClass(CSS.onScreen);
}
}
}
ElementExt.scrollIntoViewIfNeeded(
notebook.node,
notebook.widgets[activeCellIndex].node,
);
this._activeChanged.emit(void 0);
if (this._manager.layover) {
this._manager.layover.model.parts = onScreen;
}
}
protected _forceStyle() {
let panel = this._manager.activeWidget;
Iif (!panel || !(panel instanceof NotebookPanel)) {
return;
}
let stylist = (this._manager.fonts as any)._stylist as Stylist;
let meta =
(panel.model ? getPanelMetadata(panel.model, META.fonts) : null) || emptyObject;
stylist.stylesheet(meta as ISettings, panel);
this._manager.layover?.render();
}
protected _toLayoutPart(cell: Cell<ICellModel>): Layover.BasePart {
return {
key: cell.model.id,
node: cell.node,
getStyles: () => this._getCellStyles(cell),
setStyles: (styles: GlobalStyles | null) => this._setCellStyles(cell, styles),
};
}
protected _getCellStyles(cell: Cell<ICellModel>) {
try {
const meta = (getCellMetadata(cell.model, META.fonts) || emptyObject) as any;
const styles = meta.styles[META.nullSelector][META.presentingCell];
return styles;
} catch {
return emptyObject;
}
}
protected _setCellStyles(cell: Cell<ICellModel>, styles: GlobalStyles | null) {
let meta = {
...(getCellMetadata(cell.model, META.fonts) || emptyObject),
} as ISettings;
if (!meta.styles) {
meta.styles = {};
}
if (!meta.styles[META.nullSelector]) {
meta.styles[META.nullSelector] = {};
}
(meta.styles[META.nullSelector] as any)[META.presentingCell] = styles;
setCellMetadata(cell.model, META.fonts, emptyObject);
setCellMetadata(cell.model, META.fonts, { ...meta });
this._forceStyle();
}
/** Get the nbconvert-compatible `slide_type` from metadata. */
protected _getSlideType(cell: ICellModel): TSlideType {
return (
(getCellMetadata(cell, META.slideshow) || emptyObject)[META.slideType] || null
);
}
protected _initExtent(
index: number,
slideType: TSlideType,
extent: Partial<NotebookPresenter.IExtent> = emptyObject,
): NotebookPresenter.IExtent {
return {
parent: null,
onScreen: [],
visible: [],
notes: [],
forward: null,
back: null,
up: null,
down: null,
...extent,
index,
slideType,
};
}
protected _lastOnScreenOf(
index: number,
extents: NotebookPresenter.TExtentMap,
): null | NotebookPresenter.IExtent {
let e = extents.get(index);
/* istanbul ignore if */
if (!e) {
return null;
}
return extents.get(e.onScreen[0]) || null;
}
/** Get layer metadata from `jupyterlab-deck` namespace */
protected _getCellDeckMetadata(cell: ICellModel): ICellDeckMetadata {
return (getCellMetadata(cell, META.deck) ||
emptyObject) as any as ICellDeckMetadata;
}
_numSort(a: number, b: number): number {
return a - b;
}
protected _getLayers(
notebookModel: INotebookModel | null,
extents: NotebookPresenter.TExtentMap,
): NotebookPresenter.TLayerMap {
Iif (!notebookModel) {
return emptyMap;
}
let cachedLayers = this._layers.get(notebookModel);
if (cachedLayers) {
return cachedLayers;
}
let layers = new Map<number, number[]>();
// layers visible on this extent
let extentLayers: number[] | null;
let extentTypes = {
slide: [],
subslide: [],
fragment: [],
_anySlide: [],
_anyFragment: [],
null: [],
};
for (let extent of extents.values()) {
let etype = (extentTypes as any)[extent.slideType || 'null'];
if (etype) {
etype.push(extent.index);
}
}
extentTypes._anySlide = [...extentTypes.slide, ...extentTypes.subslide];
extentTypes._anyFragment = [
...extentTypes._anySlide,
...extentTypes.fragment,
...extentTypes.null,
];
for (let key in extentTypes) {
(extentTypes as any)[key].sort(this._numSort);
}
let extentIndexes = [...extents.keys()];
extentIndexes.sort(this._numSort);
let i = -1;
let j = -1;
let prev = -1;
let start = -1;
let end = -1;
for (const cell of getCellModels(notebookModel)) {
i++;
let { layer } = this._getCellDeckMetadata(cell);
if (!layer) {
continue;
}
start = extentIndexes[0];
for (j of extentIndexes) {
if (j > i) {
start = prev;
break;
}
prev = j;
}
prev = end = -1;
switch (layer) {
case 'deck':
end = extentIndexes.slice(-1)[0];
break;
case 'stack':
// visible until the next `slide`
for (j of extentTypes.slide) {
if (j > start) {
end = j - 1;
break;
}
}
break;
case 'slide':
// visible until the next `slide`/`subslide`
for (j of extentTypes._anySlide) {
if (j > start) {
end = j - 1;
break;
}
}
break;
case 'fragment':
// visible until the next `fragment`
for (j of extentTypes._anyFragment) {
if (j > start) {
end = j - 1;
break;
}
}
break;
default:
break;
}
for (let extentIndex of extentIndexes) {
if (extentIndex >= start && extentIndex <= end) {
extentLayers = layers.get(extentIndex) || null;
if (extentLayers != null) {
extentLayers.push(i);
} else {
extentLayers = [i];
layers.set(extentIndex, extentLayers);
}
}
}
}
this._layers.set(notebookModel, layers);
return layers;
}
/** Build a cell index (not id) map of what would be on-screen(s) for a given index
*
* gather:
* - the index
* - what is forward/back/up/down
* - fragments advance on down|forward, reverse on up|back
* - what is onscreen
* - what is visible
* - what are the notes
*/
protected _getExtents(
notebookModel: INotebookModel | null,
): NotebookPresenter.TExtentMap {
/* istanbul ignore if */
if (!notebookModel) {
return emptyMap;
}
const cachedExtents = this._extents.get(notebookModel);
if (cachedExtents && cachedExtents.size) {
return cachedExtents;
}
const extents: NotebookPresenter.TExtentMap = new Map();
const stacks: Record<NotebookPresenter.TStackType, NotebookPresenter.IExtent[]> = {
slides: [],
subslides: [],
fragments: [],
nulls: [],
onScreen: [],
};
let index = -1;
for (const cell of getCellModels(notebookModel)) {
index++;
let slideType = this._getSlideType(cell);
let { layer } = this._getCellDeckMetadata(cell);
if (layer) {
slideType = 'skip';
} else if (index === 0 && (slideType == null || slideType === 'subslide')) {
slideType = 'slide';
}
let extent = this._initExtent(index, slideType);
let s0: NotebookPresenter.IExtent | null = stacks.slides[0] || null;
let ss0: NotebookPresenter.IExtent | null = stacks.subslides[0] || null;
let f0: NotebookPresenter.IExtent | null = stacks.fragments[0] || null;
let n0: NotebookPresenter.IExtent | null = stacks.nulls[0] || null;
let a0 = n0 || f0 || ss0 || s0;
switch (slideType) {
case 'skip':
continue;
case null:
if (n0) {
for (let n of stacks.nulls) {
n.visible.unshift(index);
}
if (!f0) {
let a = ss0 || s0;
if (a) {
a.visible.unshift(index);
}
}
n0.forward = n0.down = index;
extent.back = extent.up = n0.index;
} else if (f0) {
f0.visible.unshift(index);
f0.forward = f0.down = index;
extent.back = extent.up = f0.index;
} else if (ss0) {
ss0.visible.unshift(index);
ss0.forward = ss0.down = index;
extent.back = extent.up = ss0.index;
} else if (s0) {
s0.visible.unshift(index);
s0.forward = s0.down = index;
extent.back = extent.up = s0.index;
}
for (let n of stacks.onScreen) {
n.onScreen.unshift(index);
}
stacks.onScreen.unshift(extent);
stacks.nulls.unshift(extent);
extent.onScreen.unshift(
...(a0?.onScreen || /* istanbul ignore next */ emptyArray),
);
extent.visible.unshift(
...(a0?.visible || /* istanbul ignore next */ emptyArray),
);
break;
case 'slide':
if (stacks.subslides.length && s0) {
// this is not strictly accurate, needs state for `y` in previous subslide stack
extent.back = s0.index;
for (let s of [...stacks.subslides, s0]) {
let lastOnScreen = this._lastOnScreenOf(s.index, extents);
if (lastOnScreen) {
lastOnScreen.forward = index;
}
}
} else if (n0) {
n0.forward = index;
extent.back = n0.index;
} else if (f0) {
f0.forward = index;
extent.back = f0.index;
} else if (s0) {
let lastOnScreen = this._lastOnScreenOf(s0.index, extents);
if (lastOnScreen) {
lastOnScreen.forward = index;
extent.back = lastOnScreen.index;
}
}
stacks.subslides = [];
stacks.nulls = [];
stacks.fragments = [];
stacks.onScreen = [extent];
stacks.slides.unshift(extent);
extent.onScreen.unshift(index);
extent.visible.unshift(index);
break;
case 'subslide':
if (n0) {
n0.down = index;
extent.up = n0.index;
} else if (f0) {
f0.down = index;
extent.up = f0.index;
} else if (s0) {
let lastOnScreen = this._lastOnScreenOf(s0.index, extents);
if (lastOnScreen) {
lastOnScreen.down = index;
extent.up = lastOnScreen.index;
}
extent.back = s0.back;
}
stacks.fragments = [];
stacks.nulls = [];
stacks.onScreen = [extent];
stacks.subslides.unshift(extent);
extent.onScreen.unshift(index);
extent.visible.unshift(index);
break;
case 'fragment':
for (let n of stacks.onScreen) {
n.onScreen.unshift(index);
}
stacks.onScreen.unshift(extent);
if (n0) {
n0.down = n0.forward = index;
extent.up = extent.back = n0.index;
} else if (f0) {
f0.down = f0.forward = index;
extent.up = extent.back = f0.index;
} else if (ss0) {
ss0.down = ss0.forward = index;
extent.up = extent.back = ss0.index;
} else if (s0) {
s0.down = s0.forward = index;
extent.up = extent.back = s0.index;
}
stacks.nulls = [];
stacks.onScreen.unshift(extent);
extent.onScreen.unshift(...(a0?.onScreen || emptyArray));
extent.visible.unshift(index, ...(a0?.visible || emptyArray));
stacks.fragments.unshift(extent);
break;
case 'notes':
if (a0) {
a0.notes.unshift(index);
}
break;
}
extents.set(index, extent);
}
this._extents.set(notebookModel, extents);
return extents;
}
}
export namespace NotebookPresenter {
export interface IOptions {
manager: IDeckManager;
commands: CommandRegistry;
notebookTools: INotebookTools;
}
export type TStackType = 'nulls' | 'fragments' | 'slides' | 'subslides' | 'onScreen';
export interface IExtent {
slideType: TSlideType;
parent: IExtent | null;
index: number;
up: number | null;
down: number | null;
forward: number | null;
back: number | null;
onScreen: number[];
visible: number[];
notes: number[];
}
export type TExtentMap = Map<number, IExtent>;
/** a map of active slide to active layers */
export type TLayerMap = Map<number, number[]>;
export type TExtentIndexMap = Map<TSlideType, number[]>;
}
|