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Input,
Component,
Inject,
ViewChild,
ElementRef,
OnChanges,
SimpleChanges,
Output,
EventEmitter,
} from '@angular/core';
import { KeyValue, RendererCustomEvent, StringOrBoolean } from './types';
import {
generateRandomValue,
getInjectablesRegistry,
stringToBoolean,
} from '../helpers/utils';
import { getLocaleContext } from '../i18n/Loader';
import { Model } from '@decaf-ts/decorator-validation';
import {
CrudOperations,
InternalError,
OperationKeys,
} from '@decaf-ts/db-decorators';
import { BaseComponentProps } from './constants';
import { NgxRenderingEngine } from './NgxRenderingEngine';
import { Logger } from '@decaf-ts/logging';
import { getLogger } from '../for-angular-common.module';
import { DecafRepository } from './types';
import { Repository } from '@decaf-ts/core';
/**
* @description Base component class that provides common functionality for all Decaf components.
* @summary The NgxBaseComponent serves as the foundation for all Decaf UI components, providing
* shared functionality for localization, element references, and styling. This abstract class
* implements common properties and methods that are used across the component library, ensuring
* consistent behavior and reducing code duplication. Components that extend this class inherit
* its capabilities for handling translations, accessing DOM elements, and applying custom styling.
*
* @template M - The model type that this component works with
* @param {string} instance - The component instance token used for identification
* @param {string} locale - The locale to be used for translations
* @param {StringOrBoolean} translatable - Whether the component should be translated
* @param {string} className - Additional CSS classes to apply to the component
* @param {"ios" | "md" | undefined} mode - Component platform style
*
* @component NgxBaseComponent
* @example
* ```typescript
* @Component({
* selector: 'app-my-component',
* templateUrl: './my-component.component.html',
* styleUrls: ['./my-component.component.scss']
* })
* export class MyComponent extends NgxBaseComponent {
* constructor(@Inject('instanceToken') instance: string) {
* super(instance);
* }
*
* ngOnInit() {
* this.initialize();
* // Component-specific initialization
* }
* }
* ```
* @mermaid
* sequenceDiagram
* participant App as Application
* participant Comp as Component
* participant Base as NgxBaseComponent
* participant Engine as NgxRenderingEngine
*
* App->>Comp: Create component
* Comp->>Base: super(instance)
* Base->>Base: Set componentName & componentLocale
*
* App->>Comp: Set @Input properties
* Comp->>Base: ngOnChanges(changes)
*
* alt model changed
* Base->>Base: getModel(model)
* Base->>Engine: getDecorators(model, {})
* Engine-->>Base: Return decorator metadata
* Base->>Base: Configure mapper and item
* Base->>Base: getLocale(translatable)
* else locale/translatable changed
* Base->>Base: getLocale(translatable)
* end
*
* App->>Comp: ngOnInit()
* Comp->>Base: initialize()
* Base->>Base: Set initialized flag
*/
@Component({
standalone: true,
template: '<div></div>',
host: { '[attr.id]': 'uid' },
})
export abstract class NgxBaseComponent implements OnChanges {
/**
* @description Reference to the component's element.
* @summary Provides direct access to the native DOM element of the component through Angular's
* ViewChild decorator. This reference can be used to manipulate the DOM element directly,
* apply custom styles, or access native element properties and methods. The element is
* identified by the 'component' template reference variable.
*
* @type {ElementRef}
* @memberOf NgxBaseComponent
*/
@ViewChild('component', { read: ElementRef, static: true })
component!: ElementRef;
/**
* @description The name of the component.
* @summary Stores the name of the component, which is typically derived from the class name.
* This property is used internally for various purposes such as logging, deriving the default
* locale, and potentially for component identification in debugging or error reporting.
*
* The `componentName` is set during the component's initialization process and should not
* be modified externally. It's marked as protected to allow access in derived classes while
* preventing direct access from outside the component hierarchy.
*
* @type {string}
* @protected
* @memberOf NgxBaseComponent
*
* @example
* // Inside a derived component class
* console.log(this.componentName); // Outputs: "MyCustomComponent"
*/
componentName!: string;
/**
* @description Unique identifier for the renderer.
* @summary A unique identifier used to reference the component's renderer instance.
* This can be used for targeting specific renderer instances when multiple components
* are present on the same page.
*
* @type {string}
* @memberOf NgxBaseComponent
*/
@Input()
rendererId!: string;
/**
* @description Repository model for data operations.
* @summary The data model repository that this component will use for CRUD operations.
* This provides a connection to the data layer for retrieving and manipulating data.
*
* @type {Model| undefined}
* @memberOf NgxBaseComponent
*/
@Input()
model!: Model | undefined;
/**
* @description The repository for interacting with the data model.
* @summary Provides a connection to the data layer for retrieving and manipulating data.
* This is an instance of the `DecafRepository` class from the `@decaf-ts/core` package,
* which is initialized in the `repository` getter method.
*
* The repository is used to perform CRUD (Create, Read, Update, Delete) operations on the
* data model, such as fetching data, creating new items, updating existing items, and deleting
* items. It also provides methods for querying and filtering data based on specific criteria.
*
* @type {DecafRepository<Model>}
* @private
* @memberOf NgxBaseComponent
*/
protected _repository?: DecafRepository<Model>;
/**
* @description Dynamic properties configuration object.
* @summary Contains key-value pairs of dynamic properties that can be applied to the component
* at runtime. This flexible configuration object allows for dynamic property assignment without
* requiring explicit input bindings for every possible configuration option. Properties from
* this object are parsed and applied to the component instance through the parseProps method,
* enabling customizable component behavior based on external configuration.
*
* @type {Record<string, unknown>}
* @default {}
* @memberOf NgxBaseComponent
*/
@Input()
props: Record<string, unknown> = {};
/**
* @description Configuration for list item rendering
* @summary Defines how list items should be rendered in the component.
* This property holds a configuration object that specifies the tag name
* and other properties needed to render list items correctly. The tag property
* identifies which component should be used to render each item in a list.
* Additional properties can be included to customize the rendering behavior.
*
* @type {Record<string, unknown>}
* @default {tag: ""}
* @memberOf NgxBaseComponent
*/
@Input()
item: Record<string, unknown> = { tag: '' };
/**
* @description Primary key field name for the model.
* @summary Specifies which field in the model should be used as the primary key.
* This is typically used for identifying unique records in operations like update and delete.
*
* @type {string}
* @default 'id'
* @memberOf NgxBaseComponent
*/
@Input()
pk!: string;
/**
* @description Base route for navigation related to this component.
* @summary Defines the base route path used for navigation actions related to this component.
* This is often used as a prefix for constructing navigation URLs.
*
* @type {string}
* @memberOf NgxBaseComponent
*/
@Input()
route!: string;
/**
* @description Available CRUD operations for this component.
* @summary Defines which CRUD operations (Create, Read, Update, Delete) are available
* for this component. This affects which operations can be performed on the data.
*
* @default [OperationKeys.READ]
* @memberOf NgxBaseComponent
*/
@Input()
operations: CrudOperations[] = [OperationKeys.READ];
/**
* @description Unique identifier for the current record.
* @summary A unique identifier for the current record being displayed or manipulated.
* This is typically used in conjunction with the primary key for operations on specific records.
*
* @type {string | number}
* @memberOf NgxBaseComponent
*/
@Input()
uid!: string | number;
/**
* @description Field mapping configuration.
* @summary Defines how fields from the data model should be mapped to properties used by the component.
* This allows for flexible data binding between the model and the component's display logic.
*
* @type {Record<string, string>}
* @memberOf NgxBaseComponent
*/
@Input()
mapper: Record<string, string> = {};
/**
* @description The locale to be used for translations.
* @summary Specifies the locale identifier to use when translating component text.
* This can be set explicitly via input property to override the automatically derived
* locale from the component name. The locale is typically a language code (e.g., 'en', 'fr')
* or a language-region code (e.g., 'en-US', 'fr-CA') that determines which translation
* set to use for the component's text content.
*
* @type {string}
* @memberOf NgxBaseComponent
*/
@Input()
locale!: string;
/**
* @description Determines if the component should be translated.
* @summary Controls whether the component's text content should be processed for translation.
* When true, the component will attempt to translate text using the specified locale.
* When false, text is displayed as-is without translation. This property accepts either
* a boolean value or a string that can be converted to a boolean (e.g., 'true', 'false', '1', '0').
*
* @type {StringOrBoolean}
* @default false
* @memberOf NgxBaseComponent
*/
@Input()
translatable: StringOrBoolean = true;
/**
* @description Additional CSS class names to apply to the component.
* @summary Allows custom CSS classes to be added to the component's root element.
* These classes are appended to any automatically generated classes based on other
* component properties. Multiple classes can be provided as a space-separated string.
* This provides a way to customize the component's appearance beyond the built-in styling options.
*
* @type {string}
* @default ""
* @memberOf NgxBaseComponent
*/
@Input()
className: string = '';
/**
* @description Component platform style.
* @summary Controls the visual appearance of the component based on platform design guidelines.
* The 'ios' mode follows iOS design patterns, while 'md' (Material Design) follows Android/Google
* design patterns. This property affects various visual aspects such as animations, form elements,
* and icons. Setting this property allows components to maintain platform-specific styling
* for a more native look and feel.
*
* @type {("ios" | "md" | undefined)}
* @default "md"
* @memberOf NgxBaseComponent
*/
@Input()
mode: 'ios' | 'md' | undefined = 'md';
/**
* @description The locale derived from the component's class name.
* @summary Stores the automatically derived locale based on the component's class name.
* This is determined during component initialization and serves as a fallback when no
* explicit locale is provided via the locale input property. The derivation is handled
* by the getLocaleContext utility function, which extracts a locale identifier
* from the component's class name.
*
* @type {string}
* @memberOf NgxBaseComponent
*/
componentLocale!: string;
/**
* @description Controls whether child components should be rendered
* @summary Determines if child components should be rendered by the component.
* This can be set to a boolean value or a string that can be converted to a boolean.
* When true, child components defined in the model will be rendered. When false,
* child components will be skipped. This provides control over the rendering depth.
*
* @type {string | StringOrBoolean}
* @default true
* @memberOf NgxBaseComponent
*/
@Input()
renderChild: string | StringOrBoolean = true;
/**
* @description Flag indicating if the component has been initialized
* @summary Tracks whether the component has completed its initialization process.
* This flag is used to prevent duplicate initialization and to determine if
* certain operations that require initialization can be performed.
*
* @type {boolean}
* @default false
*/
initialized: boolean = false;
/**
* @description Event emitter for custom renderer events.
* @summary Emits custom events that occur within child components or the layout itself.
* This allows parent components to listen for and respond to user interactions or
* state changes within the grid layout. Events are passed up the component hierarchy
* to enable coordinated behavior across the application.
*
* @type {EventEmitter<RendererCustomEvent>}
* @memberOf NgxBaseComponent
*/
@Output()
listenEvent: EventEmitter<RendererCustomEvent> =
new EventEmitter<RendererCustomEvent>();
/**
* @description Reference to the rendering engine instance
* @summary Provides access to the NgxRenderingEngine singleton instance,
* which handles the rendering of components based on model definitions.
* This engine is used to extract decorator metadata and render child components.
*
* @type {NgxRenderingEngine}
*/
renderingEngine: NgxRenderingEngine =
NgxRenderingEngine.get() as unknown as NgxRenderingEngine;
/**
* @description Logger instance for the component.
* @summary Provides logging capabilities for the component, allowing for consistent
* and structured logging of information, warnings, and errors. This logger is initialized
* in the ngOnInit method using the getLogger function from the ForAngularCommonModule.
*
* The logger is used throughout the component to record important events, debug information,
* and potential issues. It helps in monitoring the component's behavior, tracking the flow
* of operations, and facilitating easier debugging and maintenance.
*
* @type {Logger}
* @private
* @memberOf NgxBaseComponent
*/
logger!: Logger;
/**
* @description Creates an instance of NgxBaseComponent.
* @summary Initializes a new instance of the base component with the provided instance token.
* This constructor sets up the fundamental properties required by all Decaf components,
* including the component name, locale settings, and logging capabilities. The instance
* token is used for component identification and locale derivation.
*
* The constructor performs the following initialization steps:
* 1. Sets the componentName from the provided instance token
* 2. Derives the componentLocale from the class name using utility functions
* 3. Initializes the logger instance for the component
*
* @param {string} instance - The component instance token used for identification
*
* @mermaid
* sequenceDiagram
* participant A as Angular
* participant C as Component
* participant B as NgxBaseComponent
* participant U as Utils
* participant L as Logger
*
* A->>C: new Component(instance)
* C->>B: super(instance)
* B->>B: Set componentName = instance
* B->>U: getLocaleContext(instance)
* U-->>B: Return derived locale
* B->>B: Set componentLocale
* B->>L: getLogger(this)
* L-->>B: Return logger instance
* B->>B: Set logger
*
* @memberOf NgxBaseComponent
*/
// eslint-disable-next-line @angular-eslint/prefer-inject
protected constructor(@Inject('instanceToken') protected instance: string) {
this.componentName = instance;
this.componentLocale = getLocaleContext(instance);
this.logger = getLogger(this);
this.getLocale(this.translatable);
this.uid = generateRandomValue(12);
}
/**
* @description Getter for the repository instance.
* @summary Provides a connection to the data layer for retrieving and manipulating data.
* This method initializes the `_repository` property if it is not already set, ensuring
* that a single instance of the repository is used throughout the component.
*
* The repository is used to perform CRUD operations on the data model, such as fetching data,
* creating new items, updating existing items, and deleting items. It also provides methods
* for querying and filtering data based on specific criteria.
*
* @returns {DecafRepository<Model>} The initialized repository instance.
* @private
* @memberOf NgxBaseComponent
*/
protected get repository(): DecafRepository<Model> {
try {
Iif (!this._repository) {
const modelName = (this.model as Model).constructor.name;
const constructor = Model.get(modelName);
Iif (!constructor)
throw new InternalError(
'Cannot find model. was it registered with @model?'
);
this._repository = Repository.forModel(constructor);
this.model = new constructor() as Model;
Iif (this.model && !this.pk)
this.pk =
(this._repository as unknown as DecafRepository<Model>).pk || 'id';
}
} catch (error: unknown) {
throw new InternalError((error as Error)?.message || (error as string));
}
return this._repository;
}
/**
* @description Handles changes to component inputs
* @summary This Angular lifecycle hook is called when input properties change.
* It responds to changes in the model, locale, or translatable properties by
* updating the component's internal state accordingly. When the model changes,
* it calls getModel to process the new model and getLocale to update the locale.
* When locale or translatable properties change, it calls getLocale to update
* the translation settings.
*
* @param {SimpleChanges} changes - Object containing changed properties
* @return {void}
*/
ngOnChanges(changes: SimpleChanges): void {
Iif (changes[BaseComponentProps.MODEL]) {
const { currentValue } = changes[BaseComponentProps.MODEL];
Iif (currentValue) this.getModel(currentValue);
this.getLocale(this.translatable);
}
Iif (
changes[BaseComponentProps.INITIALIZED] ||
changes[BaseComponentProps.LOCALE] ||
changes[BaseComponentProps.TRANSLATABLE]
)
this.getLocale(this.translatable);
}
/**
* @description Gets the appropriate locale string based on the translatable flag and available locales.
* @summary Determines which locale string to use for translation based on the translatable flag
* and available locale settings. This method first converts the translatable parameter to a boolean
* using the stringToBoolean utility function. If translatable is false, it returns an empty string,
* indicating no translation should be performed. If translatable is true, it checks for an explicitly
* provided locale via the locale property. If no explicit locale is available, it falls back to the
* componentLocale derived from the component's class name.
*
* @param {StringOrBoolean} translatable - Whether the component should be translated
* @return {string} The locale string to use for translation, or empty string if not translatable
*
* @mermaid
* sequenceDiagram
* participant C as Component
* participant N as NgxBaseComponent
* participant S as StringUtils
*
* C->>N: getLocale(translatable)
* N->>S: stringToBoolean(translatable)
* S-->>N: Return boolean value
* N->>N: Store in this.translatable
* alt translatable is false
* N-->>C: Return empty string
* else translatable is true
* alt this.locale is defined
* N-->>C: Return this.locale
* else this.locale is not defined
* N-->>C: Return this.componentLocale
* end
* end
*/
getLocale(translatable: StringOrBoolean): string {
this.translatable = stringToBoolean(translatable);
Iif (!this.translatable) return '';
if (!this.locale) this.locale = this.componentLocale;
return this.locale;
}
/**
* @description Gets the route for the component
* @summary Retrieves the route path for the component, generating one based on the model
* if no route is explicitly set. This method checks if a route is already defined, and if not,
* it creates a default route based on the model's constructor name. The generated route follows
* the pattern '/model/{ModelName}'. This is useful for automatic routing in CRUD operations.
*
* @return {string} The route path for the component, or empty string if no route is available
*/
getRoute(): string {
Iif (!this.route && this.model instanceof Model)
this.route = `/model/${this.model?.constructor.name}`;
return this.route || '';
}
/**
* @description Resolves and sets the component's model
* @summary Processes the provided model parameter, which can be either a Model instance
* or a string identifier. If a string is provided, it attempts to resolve the actual model
* from the injectables registry. After resolving the model, it calls setModelDefinitions
* to configure the component based on the model's metadata.
*
* @param {string | Model} model - The model instance or identifier string
* @return {void}
*/
getModel(model: string | Model): void {
Iif (!(model instanceof Model))
this.model = getInjectablesRegistry().get(model) as Model;
this.setModelDefinitions(this.model as Model);
}
/**
* @description Configures component properties based on model metadata
* @summary Extracts and applies configuration from the model's decorators to set up
* the component. This method uses the rendering engine to retrieve decorator metadata
* from the model, then configures the component's mapper and item properties accordingly.
* It ensures the route is properly set and merges various properties from the model's
* metadata into the component's configuration.
*
* @param {Model} model - The model to extract configuration from
* @return {void}
*/
setModelDefinitions(model: Model): void {
Iif (model instanceof Model) {
this.getRoute();
this.model = model;
const field = this.renderingEngine.getDecorators(this.model as Model, {});
const { props, item, children } = field;
this.props = Object.assign(props || {}, { children: children || [] });
Iif (item?.props?.['mapper'])
this.mapper = item?.props!['mapper'] || {};
this.item = {
tag: item?.tag || '',
...item?.props,
...(this.mapper ? { mapper: this.mapper } : {}),
...{ route: item?.props?.['route'] || this.route },
};
}
}
/**
* @description Initializes the component
* @summary Performs one-time initialization of the component. This method checks if
* the component has already been initialized to prevent duplicate initialization.
* When called for the first time, it sets the initialized flag to true and logs
* an initialization message with the component name. This method is typically called
* during the component's lifecycle setup.
*/
async initialize(parseProps: boolean = true, skip?: string[]): Promise<void> {
if(!this.initialized && parseProps)
return this.parseProps(this, skip || []);
this.initialized = true;
}
/**
* @description Handles custom events from child components.
* @summary Receives events from child renderer components and forwards them to parent
* components through the listenEvent output. This creates an event propagation chain
* that allows events to bubble up through the component hierarchy, enabling coordinated
* responses to user interactions across the layout structure.
*
* @param {RendererCustomEvent} event - The custom event from a child component
* @return {void}
*
* @mermaid
* sequenceDiagram
* participant C as Child Component
* participant L as NgxBaseComponent
* participant P as Parent Component
*
* C->>L: Emit RendererCustomEvent
* L->>L: handleEvent(event)
* L->>P: listenEvent.emit(event)
* Note over P: Handle event in parent
*
* @memberOf NgxBaseComponent
*/
handleEvent(event: RendererCustomEvent): void {
this.listenEvent.emit(event);
}
/**
* @description Tracks items in ngFor loops for optimal change detection.
* @summary Provides a tracking function for Angular's *ngFor directive to optimize rendering
* performance. This method generates unique identifiers for list items based on their index
* and content, allowing Angular to efficiently track changes and minimize DOM manipulations
* during list updates. The tracking function is essential for maintaining component state
* and preventing unnecessary re-rendering of unchanged items.
*
* @param {number} index - The index of the item in the list
* @param {KeyValue | string | number} item - The item data to track
* @returns {string | number} A unique identifier for the item
* @memberOf NgxBaseComponent
*/
trackItemFn(
index: number,
item: KeyValue | string | number
): string | number {
return `${index}-${item}`;
}
/**
* @description Parses and applies properties from the props object to the component instance.
* @summary This method iterates through the properties of the provided instance object
* and applies any matching properties from the component's props configuration to the
* component instance. This allows for dynamic property assignment based on configuration
* stored in the props object, enabling flexible component customization without requiring
* explicit property binding for every possible configuration option.
*
* The method performs a safe property assignment by checking if each key from the instance
* exists in the props object before applying it. This prevents accidental property
* overwriting and ensures only intended properties are modified.
*
* @param {KeyValue} instance - The component instance object to process
* @return {void}
*
* @mermaid
* sequenceDiagram
* participant C as Component
* participant B as NgxBaseComponent
* participant P as Props Object
*
* C->>B: parseProps(instance)
* B->>B: Get Object.keys(instance)
* loop For each key in instance
* B->>P: Check if key exists in this.props
* alt Key exists in props
* B->>B: Set this[key] = this.props[key]
* else Key not in props
* Note over B: Skip this key
* end
* end
*
* @protected
* @memberOf NgxBaseComponent
*/
protected parseProps(instance: KeyValue, skip: string[]): void {
Object.keys(instance).forEach((key) => {
Iif (Object.keys(this.props).includes(key) && !skip.includes(key)) {
(this as KeyValue)[key] = this.props[key];
delete this.props[key];
}
});
if(!this.initialized)
this.initialized = true;
}
}
|