Advanced Widgets

/**
 * Abstract model for windowed list data and behavior
 */
abstract class WindowedListModel implements WindowedList.IModel {
  /**
   * Create windowed list model
   * @param options - Model configuration options
   */
  constructor(options?: WindowedList.IModelOptions);
  
  // Abstract methods that must be implemented
  /** Estimate size of widget at given index */
  abstract estimateWidgetSize: (index: number) => number;
  /** Create widget for rendering item at index */
  abstract widgetRenderer: (index: number) => Widget;
  
  // Scroll behavior configuration
  readonly scrollDownThreshold: number = 1;
  readonly scrollUpThreshold: number = 0;
  paddingTop: number = 0;
  
  /** Total height of the viewport */
  get height(): number;
  set height(h: number);
  
  /** Observable list of items */
  get itemsList(): ISimpleObservableList | null;
  set itemsList(v: ISimpleObservableList | null);
  
  /** Number of items to render outside visible area */
  get overscanCount(): number;
  set overscanCount(newValue: number);
  
  /** Current scroll position */
  get scrollOffset(): number;
  set scrollOffset(offset: number);
  
  /** Total number of widgets/items */
  get widgetCount(): number;
  set widgetCount(newValue: number);
  
  /** Whether windowing optimization is active */
  get windowingActive(): boolean;
  set windowingActive(newValue: boolean);
  
  /** Signal emitted when model state changes */
  get stateChanged(): ISignal<WindowedListModel, IChangedArgs<any, any, string>>;
  
  // Methods for size and scroll calculations
  getEstimatedTotalSize(): number;
  getOffsetForIndexAndAlignment(/* parameters */): number;
  getRangeToRender(): WindowedList.WindowIndex | null;
  getSpan(startIndex: number, stopIndex: number): [number, number];
  resetAfterIndex(index: number): void;
  setWidgetSize(sizes: { index: number; size: number }[]): boolean;
}

/**
 * High-performance windowed list widget for large datasets
 */
class WindowedList<T extends WindowedList.IModel = WindowedList.IModel, U = any> extends Widget {
  static readonly DEFAULT_WIDGET_SIZE = 50;
  
  /**
   * Create windowed list widget
   * @param options - Widget configuration options
   */
  constructor(options: WindowedList.IOptions<T, U>);
  
  /** Whether parent container is hidden */
  get isParentHidden(): boolean;
  set isParentHidden(v: boolean);
  
  /** Layout manager for the list */
  get layout(): WindowedLayout;
  
  /** Outer container element */
  get outerNode(): HTMLElement;
  
  /** Viewport scrolling element */
  get viewportNode(): HTMLElement;
  
  /** Whether scrollbar is enabled */
  get scrollbar(): boolean;
  set scrollbar(enabled: boolean);
  
  /**
   * Scroll to specific offset
   * @param scrollOffset - Pixel offset to scroll to
   */
  scrollTo(scrollOffset: number): void;
  
  /**
   * Scroll to specific item index
   * @param index - Item index to scroll to
   * @param align - Alignment behavior
   * @param margin - Additional margin
   * @param alignPreference - Alignment preference
   * @returns Promise that resolves when scroll completes
   */
  scrollToItem(
    index: number,
    align?: WindowedList.ScrollToAlign,
    margin?: number,
    alignPreference?: WindowedList.BaseScrollToAlignment
  ): Promise<void>;
}

namespace WindowedList {
  interface IModel<T = any> extends IDisposable {
    estimateWidgetSize: (index: number) => number;
    widgetRenderer: (index: number) => Widget;
    // ... extensive interface with many properties
  }
  
  interface IOptions<T extends WindowedList.IModel = WindowedList.IModel, U = any> {
    /** Model instance */
    model: T;
    /** Custom layout */
    layout?: WindowedLayout;
    /** Custom renderer */
    renderer?: IRenderer<U>;
    /** Enable scrollbar */
    scrollbar?: boolean;
  }
  
  interface IRenderer<T = any> {
    createOuter(): HTMLElement;
    createScrollbar(): HTMLElement;
    createScrollbarViewportIndicator?(): HTMLElement;
    createScrollbarItem(list: WindowedList, index: number, item: T | undefined): HTMLElement | IRenderer.IScrollbarItem;
    createViewport(): HTMLElement;
  }
  
  type BaseScrollToAlignment = 'center' | 'top-center' | 'start' | 'end';
  type ScrollToAlign = 'auto' | 'smart' | BaseScrollToAlignment;
  type WindowIndex = [number, number, number, number];
}

/**
 * Observable list interface for windowed lists
 */
interface ISimpleObservableList<T> {
  readonly length: number;
  get(index: number): T | undefined;
  set(index: number, value: T): void;
  push(...values: T[]): number;
  insert(index: number, value: T): void;
  remove(index: number): T | undefined;
  clear(): void;
}

import { WindowedList, WindowedListModel, ReactWidget } from '@jupyterlab/ui-components';
import { Widget } from '@lumino/widgets';

// Custom model for file list
class FileListModel extends WindowedListModel {
  constructor(private files: FileInfo[]) {
    super();
    this.widgetCount = files.length;
  }

  estimateWidgetSize = (index: number): number => {
    // Estimate size based on file type
    const file = this.files[index];
    return file?.isDirectory ? 40 : 30;
  };

  widgetRenderer = (index: number): Widget => {
    const file = this.files[index];
    return ReactWidget.create(
      <div className="file-item">
        <span className="file-icon">{file.isDirectory ? '📁' : '📄'}</span>
        <span className="file-name">{file.name}</span>
        <span className="file-size">{file.size}</span>
      </div>
    );
  };
}

// Create windowed file list
const fileModel = new FileListModel(largeFileArray);
const fileList = new WindowedList({
  model: fileModel,
  scrollbar: true
});

// Handle large datasets efficiently
fileModel.itemsList = new ObservableList(largeFileArray);
fileModel.windowingActive = true;
fileModel.overscanCount = 10; // Render 10 extra items outside viewport

// Scroll to specific file
async function scrollToFile(fileName: string) {
  const index = largeFileArray.findIndex(f => f.name === fileName);
  if (index >= 0) {
    await fileList.scrollToItem(index, 'center');
  }
}

// Custom renderer for complex items
class CustomFileRenderer implements WindowedList.IRenderer<FileInfo> {
  createOuter(): HTMLElement {
    const outer = document.createElement('div');
    outer.className = 'custom-file-list';
    return outer;
  }

  createViewport(): HTMLElement {
    const viewport = document.createElement('div');
    viewport.className = 'file-viewport';
    return viewport;
  }

  createScrollbar(): HTMLElement {
    const scrollbar = document.createElement('div');
    scrollbar.className = 'custom-scrollbar';
    return scrollbar;
  }

  createScrollbarItem(list: WindowedList, index: number, file: FileInfo | undefined) {
    const item = document.createElement('div');
    item.className = 'scrollbar-item';
    if (file) {
      item.textContent = file.name.charAt(0).toUpperCase();
    }
    return item;
  }
}

/**
 * Panel widget with integrated toolbar
 */
class PanelWithToolbar extends Panel implements Toolbar.IWidgetToolbar {
  /**
   * Create panel with toolbar
   * @param options - Panel configuration options
   */
  constructor(options?: PanelWithToolbar.IOptions);
  
  /** Integrated toolbar instance */
  get toolbar(): Toolbar;
}

namespace PanelWithToolbar {
  interface IOptions extends Panel.IOptions {
    /** Custom toolbar instance */
    toolbar?: Toolbar;
  }
}

import { PanelWithToolbar, Toolbar, ToolbarButton } from '@jupyterlab/ui-components';
import { saveIcon, refreshIcon } from '@jupyterlab/ui-components';

// Create panel with integrated toolbar
const panel = new PanelWithToolbar();
panel.title.label = 'File Editor';
panel.addClass('editor-panel');

// Add buttons to toolbar
const saveButton = new ToolbarButton({
  icon: saveIcon,
  tooltip: 'Save file',
  onClick: () => saveCurrentFile()
});

const refreshButton = new ToolbarButton({
  icon: refreshIcon,
  tooltip: 'Refresh content',
  onClick: () => refreshContent()
});

panel.toolbar.addItem('save', saveButton);
panel.toolbar.addItem('refresh', refreshButton);

// Add content widgets
const editorWidget = new CodeEditorWrapper();
const statusWidget = new StatusBar();

panel.addWidget(editorWidget);
panel.addWidget(statusWidget);

// Custom toolbar for specific use case
const customToolbar = new Toolbar();
customToolbar.addClass('custom-editor-toolbar');

const customPanel = new PanelWithToolbar({
  toolbar: customToolbar
});

/**
 * Widget for sidebars with accordion layout
 */
class SidePanel extends Widget {
  /**
   * Create side panel
   * @param options - Side panel configuration options
   */
  constructor(options?: SidePanel.IOptions);
  
  /** Content panel for main widgets */
  get content(): Panel;
  
  /** Header panel for titles/controls */
  get header(): Panel;
  
  /** Integrated toolbar */
  get toolbar(): Toolbar;
  
  /** Array of contained widgets */
  get widgets(): ReadonlyArray<Widget>;
  
  /**
   * Add widget to side panel
   * @param widget - Widget with toolbar support
   */
  addWidget(widget: Toolbar.IWidgetToolbar): void;
  
  /**
   * Insert widget at specific index
   * @param index - Position to insert at
   * @param widget - Widget with toolbar support
   */
  insertWidget(index: number, widget: Toolbar.IWidgetToolbar): void;
}

namespace SidePanel {
  interface IOptions extends AccordionPanel.IOptions {
    /** Custom content panel */
    content?: Panel;
    /** Custom header panel */
    header?: Panel;
    /** Custom toolbar */
    toolbar?: Toolbar;
    /** Translator for internationalization */
    translator?: ITranslator;
  }
}

import { SidePanel, ReactWidget } from '@jupyterlab/ui-components';

// Create side panel for file browser
const filePanel = new SidePanel();
filePanel.title.label = 'Files';
filePanel.addClass('file-browser-panel');

// Create widgets for side panel sections
class FileTreeWidget extends ReactWidget {
  constructor() {
    super();
    this.title.label = 'File Tree';
    this.addClass('file-tree-widget');
  }

  protected render() {
    return <div>File tree content here</div>;
  }
}

class SearchWidget extends ReactWidget {
  constructor() {
    super();
    this.title.label = 'Search';
    this.addClass('search-widget');
  }

  protected render() {
    return <div>Search interface here</div>;
  }
}

// Add sections to side panel
const fileTree = new FileTreeWidget();
const searchWidget = new SearchWidget();

filePanel.addWidget(fileTree);
filePanel.addWidget(searchWidget);

// Access panel components
console.log('Content panel:', filePanel.content);
console.log('Header panel:', filePanel.header);
console.log('Toolbar:', filePanel.toolbar);

// Add custom toolbar items
const refreshButton = new ToolbarButton({
  icon: refreshIcon,
  tooltip: 'Refresh files'
});
filePanel.toolbar.addItem('refresh', refreshButton);

/**
 * Accordion panel with toolbar support
 */
namespace AccordionToolbar {
  class Renderer extends AccordionPanel.Renderer {
    /**
     * Create collapse icon for section headers
     * @param data - Title data for the section
     * @returns HTML element for collapse icon
     */
    createCollapseIcon(data: Title<Widget>): HTMLElement;
    
    /**
     * Create section title element
     * @param data - Title data for the section
     * @returns HTML element for section title
     */
    createSectionTitle(data: Title<Widget>): HTMLElement;
  }
  
  /** Default renderer instance */
  const defaultRenderer: Renderer;
  
  /**
   * Create layout for accordion with toolbar support
   * @param options - Accordion panel options
   * @returns Configured accordion layout
   */
  function createLayout(options: AccordionPanel.IOptions): AccordionLayout;
}

import { AccordionToolbar, AccordionPanel } from '@jupyterlab/ui-components';

// Create accordion with custom renderer
const accordion = new AccordionPanel({
  renderer: AccordionToolbar.defaultRenderer
});

// Create layout with toolbar support
const layout = AccordionToolbar.createLayout({
  renderer: AccordionToolbar.defaultRenderer
});

// Custom accordion with enhanced titles
class EnhancedAccordion extends AccordionPanel {
  constructor() {
    super({
      renderer: new AccordionToolbar.Renderer()
    });
  }
}

const enhancedAccordion = new EnhancedAccordion();

// Add sections with custom titles
const section1 = new ReactWidget();
section1.title.label = 'Configuration';
section1.title.iconClass = 'jp-SettingsIcon';

const section2 = new ReactWidget();
section2.title.label = 'Advanced Options';
section2.title.iconClass = 'jp-AdvancedIcon';

enhancedAccordion.addWidget(section1);
enhancedAccordion.addWidget(section2);

/**
 * Extensible menu interface with ranking support
 */
interface IRankedMenu extends IDisposable {
  /**
   * Add group of menu items with shared rank
   * @param items - Array of menu item options
   * @param rank - Rank for ordering (default: 100)
   * @returns Disposable for removing the group
   */
  addGroup(items: Menu.IItemOptions[], rank?: number): IDisposable;
  
  /**
   * Add single menu item with rank
   * @param options - Menu item options with rank
   * @returns Disposable menu item
   */
  addItem(options: IRankedMenu.IItemOptions): IDisposable;
  
  /** Read-only array of menu items */
  readonly items: ReadonlyArray<Menu.IItem>;
  
  /** Optional rank for this menu */
  readonly rank?: number;
}

namespace IRankedMenu {
  const DEFAULT_RANK = 100;
  
  interface IItemOptions extends Menu.IItemOptions {
    /** Item rank for ordering */
    rank?: number;
  }
  
  interface IOptions extends Menu.IOptions {
    /** Include separators between ranked groups */
    includeSeparators?: boolean;
    /** Menu rank */
    rank?: number;
  }
}

/**
 * Menu implementation with ranking support
 */
class RankedMenu extends Menu implements IRankedMenu {
  /**
   * Create ranked menu
   * @param options - Menu configuration options
   */
  constructor(options: IRankedMenu.IOptions);
  
  /** Menu rank */
  get rank(): number | undefined;
  
  /**
   * Add group of items with shared rank
   */
  addGroup(items: IRankedMenu.IItemOptions[], rank?: number): IDisposable;
  
  /**
   * Add single item with rank
   */
  addItem(options: IRankedMenu.IItemOptions): IDisposableMenuItem;
  
  /**
   * Get rank of item at index
   * @param index - Item index
   * @returns Item rank
   */
  getRankAt(index: number): number;
}

/**
 * Disposable menu item interface
 */
interface IDisposableMenuItem extends IDisposable {
  // Menu item that can be disposed
}

import { RankedMenu, IRankedMenu, CommandRegistry } from '@jupyterlab/ui-components';

// Create ranked menu with commands
const commands = new CommandRegistry();

commands.addCommand('file:new', {
  label: 'New File',
  execute: () => console.log('New file')
});

commands.addCommand('file:open', {
  label: 'Open File', 
  execute: () => console.log('Open file')
});

const fileMenu = new RankedMenu({
  commands,
  includeSeparators: true
});

// Add file operations group (high priority)
const fileGroup = fileMenu.addGroup([
  { command: 'file:new', rank: 10 },
  { command: 'file:open', rank: 20 }
], 1);

// Add recent files group (lower priority)
const recentGroup = fileMenu.addGroup([
  { type: 'submenu', submenu: recentFilesMenu, rank: 10 }
], 50);

// Add individual items
const saveItem = fileMenu.addItem({
  command: 'file:save',
  rank: 30
});

// Clean up when done
function cleanup() {
  fileGroup.dispose();
  recentGroup.dispose(); 
  saveItem.dispose();
}

// Check item ranks
for (let i = 0; i < fileMenu.items.length; i++) {
  console.log(`Item ${i} rank:`, fileMenu.getRankAt(i));
}

/**
 * Node styling utilities
 */
namespace Styling {
  /**
   * Apply styling to HTML element
   * @param node - Element to style
   * @param className - CSS class to apply
   */
  function styleNode(node: HTMLElement, className?: string): void;
  
  /**
   * Apply styling to elements by tag name
   * @param node - Container element
   * @param tagName - Tag name to target
   * @param className - CSS class to apply
   */
  function styleNodeByTag(node: HTMLElement, tagName: string, className?: string): void;
  
  /**
   * Wrap select element with custom styling
   * @param node - Select element to wrap
   * @param multiple - Whether select allows multiple selections
   * @returns Wrapped container element
   */
  function wrapSelect(node: HTMLSelectElement, multiple?: boolean): HTMLElement;
}

import { Styling } from '@jupyterlab/ui-components';

// Style widget nodes
class CustomWidget extends Widget {
  onAfterAttach() {
    super.onAfterAttach();
    
    // Apply JupyterLab styling
    Styling.styleNode(this.node, 'jp-CustomWidget');
    
    // Style all buttons in widget
    Styling.styleNodeByTag(this.node, 'button', 'jp-Button');
    
    // Style all inputs
    Styling.styleNodeByTag(this.node, 'input', 'jp-InputGroup-input');
  }
}

// Wrap select elements
const selectElement = document.createElement('select');
selectElement.innerHTML = `
  <option value="1">Option 1</option>
  <option value="2">Option 2</option>
`;

const wrappedSelect = Styling.wrapSelect(selectElement);
document.body.appendChild(wrappedSelect);

// Multi-select wrapper
const multiSelect = document.createElement('select');
multiSelect.multiple = true;
const wrappedMulti = Styling.wrapSelect(multiSelect, true);