Form System

/**
 * Generic RJSF form component with JupyterLab styling and customizations
 */
interface IFormComponentProps<T = ReadonlyJSONObject> extends FormProps<T>, FormComponent.ILabCustomizerProps {
  /** Current form data */
  formData: T;
  /** Callback for form data changes */
  onChange: (e: IChangeEvent<T>) => any;
  /** Additional form context */
  formContext?: unknown;
}

/**
 * Main form component for rendering JSON Schema forms
 * @param props - Form configuration and data
 * @returns JSX form element
 */
function FormComponent(props: IFormComponentProps): JSX.Element;

namespace FormComponent {
  interface IButtonProps {
    /** Button style variant for array controls */
    buttonStyle?: 'icons' | 'text';
    /** Translator for internationalization */
    translator?: ITranslator;
  }
  
  interface ILabCustomizerProps extends IButtonProps {
    /** Use compact form layout */
    compact?: boolean;
    /** Show indicators for values that differ from defaults */
    showModifiedFromDefault?: boolean;
  }
}

/**
 * Default UI options for forms
 */
const DEFAULT_UI_OPTIONS = {
  submitButtonOptions: { norender: true }
};

import React, { useState } from 'react';
import { FormComponent, DEFAULT_UI_OPTIONS } from '@jupyterlab/ui-components';
import { JSONSchema7 } from 'json-schema';

// Basic form usage
interface UserSettings {
  theme: string;
  fontSize: number;
  enableAutoSave: boolean;
}

const userSchema: JSONSchema7 = {
  type: 'object',
  properties: {
    theme: {
      type: 'string',
      enum: ['light', 'dark', 'auto'],
      default: 'light'
    },
    fontSize: {
      type: 'number',
      minimum: 10,
      maximum: 24,
      default: 14
    },
    enableAutoSave: {
      type: 'boolean',
      default: true
    }
  }
};

function SettingsForm() {
  const [formData, setFormData] = useState<UserSettings>({
    theme: 'light',
    fontSize: 14,
    enableAutoSave: true
  });

  return (
    <FormComponent
      schema={userSchema}
      formData={formData}
      onChange={(e) => setFormData(e.formData)}
      uiSchema={{
        ...DEFAULT_UI_OPTIONS,
        theme: { 'ui:widget': 'select' },
        fontSize: { 'ui:widget': 'range' }
      }}
      compact={true}
      showModifiedFromDefault={true}
    />
  );
}

// Advanced form with custom widgets
const advancedSchema: JSONSchema7 = {
  type: 'object',
  properties: {
    plugins: {
      type: 'array',
      items: {
        type: 'object',
        properties: {
          name: { type: 'string' },
          enabled: { type: 'boolean' },
          config: { type: 'object' }
        }
      }
    }
  }
};

function AdvancedForm() {
  const [data, setData] = useState({ plugins: [] });

  return (
    <FormComponent
      schema={advancedSchema}
      formData={data}
      onChange={(e) => setData(e.formData)}
      buttonStyle="icons"
      uiSchema={{
        plugins: {
          'ui:options': {
            addable: true,
            removable: true
          }
        }
      }}
    />
  );
}

/**
 * Button for moving array items up/down
 * @param props - Button styling properties
 * @returns JSX button element
 */
function MoveButton(props: FormComponent.IButtonProps): JSX.Element;

/**
 * Button for removing array items
 * @param props - Button styling properties
 * @returns JSX button element
 */
function DropButton(props: FormComponent.IButtonProps): JSX.Element;

/**
 * Button for adding new array items
 * @param props - Button styling properties
 * @returns JSX button element
 */
function AddButton(props: FormComponent.IButtonProps): JSX.Element;

import { MoveButton, DropButton, AddButton } from '@jupyterlab/ui-components';

// Custom array template with styled buttons
function CustomArrayTemplate(props: any) {
  return (
    <div className="array-container">
      <div className="array-header">
        <h3>{props.title}</h3>
        <AddButton buttonStyle="icons" />
      </div>
      
      {props.items.map((element: any, index: number) => (
        <div key={index} className="array-item">
          <div className="item-content">
            {element.children}
          </div>
          <div className="item-controls">
            <MoveButton buttonStyle="icons" />
            <DropButton buttonStyle="text" />
          </div>
        </div>
      ))}
    </div>
  );
}

// Use in form configuration
const arrayFormConfig = {
  schema: myArraySchema,
  uiSchema: {
    myArray: {
      'ui:ArrayFieldTemplate': CustomArrayTemplate
    }
  }
};

/**
 * Interface for form renderers
 */
interface IFormRenderer {
  /** Custom field renderer */
  fieldRenderer?: Field;
  /** Custom widget renderer */
  widgetRenderer?: Widget;
}

/**
 * Registry interface for managing form renderers
 */
interface IFormRendererRegistry {
  /** Add a new renderer to the registry */
  addRenderer: (id: string, renderer: IFormRenderer) => void;
  /** Get renderer by ID */
  getRenderer: (id: string) => IFormRenderer;
  /** All registered renderers */
  renderers: { [id: string]: IFormRenderer };
}

/**
 * Dependency injection token for form renderer registry
 */
const IFormRendererRegistry: Token<IFormRendererRegistry>;

/**
 * Concrete implementation of form renderer registry
 */
class FormRendererRegistry implements IFormRendererRegistry {
  addRenderer(id: string, renderer: IFormRenderer): void;
  getRenderer(id: string): IFormRenderer;
  get renderers(): { [id: string]: IFormRenderer };
}

/**
 * Placeholder interface for future icon manager functionality
 */
interface ILabIconManager {}

/**
 * Dependency injection token for icon manager service
 */
const ILabIconManager: Token<ILabIconManager>;

import { FormRendererRegistry, IFormRenderer } from '@jupyterlab/ui-components';

// Create custom renderer
const colorPickerRenderer: IFormRenderer = {
  widgetRenderer: ({ value, onChange }) => (
    <input
      type="color"
      value={value || '#000000'}
      onChange={(e) => onChange(e.target.value)}
      className="color-picker-widget"
    />
  )
};

// Register custom renderer
const registry = new FormRendererRegistry();
registry.addRenderer('colorPicker', colorPickerRenderer);

// Use in form schema
const schemaWithCustomWidget: JSONSchema7 = {
  type: 'object',
  properties: {
    backgroundColor: {
      type: 'string',
      format: 'color',
      default: '#ffffff'
    }
  }
};

const uiSchemaWithCustomWidget = {
  backgroundColor: {
    'ui:widget': 'colorPicker'
  }
};

// Register with dependency injection
import { ServiceManager } from '@jupyterlab/services';

const services = new ServiceManager();
services.contents.add(IFormRendererRegistry, new FormRendererRegistry());

// Get registered renderer
const renderer = registry.getRenderer('colorPicker');

// Form validation is handled through JSON Schema validation
// Custom validation can be added through schema definitions

interface ValidationError {
  name: string;
  property: string;
  message: string;
  argument: any;
  stack: string;
}

// Error handling in form components
interface FormErrorProps {
  errors: ValidationError[];
  schema: JSONSchema7;
  uiSchema: any;
}

import { FormComponent } from '@jupyterlab/ui-components';
import { JSONSchema7 } from 'json-schema';

// Schema with validation rules
const validationSchema: JSONSchema7 = {
  type: 'object',
  properties: {
    email: {
      type: 'string',
      format: 'email',
      title: 'Email Address'
    },
    age: {
      type: 'number',
      minimum: 0,
      maximum: 150,
      title: 'Age'
    },
    password: {
      type: 'string',
      minLength: 8,
      pattern: '^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)',
      title: 'Password'
    }
  },
  required: ['email', 'password']
};

// Custom validation function
function customValidate(formData: any, errors: any) {
  if (formData.password && formData.confirmPassword) {
    if (formData.password !== formData.confirmPassword) {
      errors.confirmPassword.addError('Passwords must match');
    }
  }
  return errors;
}

// Form with validation
function ValidatedForm() {
  const [formData, setFormData] = useState({});
  const [errors, setErrors] = useState<ValidationError[]>([]);

  return (
    <div>
      <FormComponent
        schema={validationSchema}
        formData={formData}
        onChange={(e) => {
          setFormData(e.formData);
          setErrors(e.errors || []);
        }}
        validate={customValidate}
        showErrorList={true}
        liveValidate={true}
      />
      
      {errors.length > 0 && (
        <div className="form-errors">
          <h4>Please fix the following errors:</h4>
          <ul>
            {errors.map((error, i) => (
              <li key={i}>{error.message}</li>
            ))}
          </ul>
        </div>
      )}
    </div>
  );
}

// Custom field template interfaces from RJSF
interface FieldTemplateProps {
  id: string;
  label: string;
  children: React.ReactNode;
  errors: React.ReactNode;
  help: React.ReactNode;
  description: React.ReactNode;
  hidden: boolean;
  required: boolean;
  readonly: boolean;
  disabled: boolean;
  displayLabel: boolean;
  schema: JSONSchema7;
  uiSchema: any;
  formContext: any;
}

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

// Custom field template
function CustomFieldTemplate(props: FieldTemplateProps) {
  const { id, label, children, errors, help, required, schema } = props;
  
  return (
    <div className={`field-${schema.type}`}>
      <div className="field-header">
        <label htmlFor={id} className="field-label">
          {label}
          {required && <span className="required">*</span>}
        </label>
        {help && <div className="field-help">{help}</div>}
      </div>
      
      <div className="field-input">
        {children}
      </div>
      
      {errors && <div className="field-errors">{errors}</div>}
    </div>
  );
}

// Use custom template in form
<FormComponent
  schema={mySchema}
  formData={formData}
  onChange={handleChange}
  templates={{
    FieldTemplate: CustomFieldTemplate
  }}
/>

// Custom object field template
function CustomObjectTemplate(props: any) {
  return (
    <fieldset className="object-fieldset">
      <legend>{props.title}</legend>
      <div className="object-properties">
        {props.properties.map((prop: any) => prop.content)}
      </div>
    </fieldset>
  );
}

// Apply to specific fields
const customUiSchema = {
  myObject: {
    'ui:ObjectFieldTemplate': CustomObjectTemplate
  }
};