x4js/src/core/component.ts

X4 framework

/** 
 *  ___  ___ __
 *  \  \/  /  / _
 *   \    /  /_| |_
 *   /    \____   _|  
 *  /__/\__\   |_|
 * 
 * @file component.ts
 * @author Etienne Cochard 
 * 
 * @copyright (c) 2024 R-libre ingenierie
 *
 * Use of this source code is governed by an MIT-style license 
 * that can be found in the LICENSE file or at https://opensource.org/licenses/MIT.
 **/

import { isArray, UnsafeHtml, isNumber, Rect, Constructor, class_ns, x4_class_ns_sym, IRect } from './core_tools';
import { CoreElement } from './core_element';
import { ariaValues, unitless } from './core_styles';
import { CoreEvent, EventMap } from './core_events';
import { addEvent, DOMEventHandler, GlobalDOMEvents } from './core_dom';

interface RefType<T extends Component> {
	dom: T;
}

type ComponentAttributes = Record<string,string|number|boolean>;
type CreateComponentCallBack =  ( attrs: Record<string,string> ) => ComponentContent;

const FRAGMENT = Symbol( "fragment" );
const COMPONENT = Symbol( "component" );

const RE_NUMBER = /^-?\d+(\.\d*)?$/;

/**
 * you can change css classname prefix by adding
 *
 *  ```
 * static "$cls-ns" = "<your prefix>";
 * ```
 * 
 * to your class to avoid autogenerated css class names conflicts
 */

function genClassNames( x: any ): string[] {
	
	const classes = [];
	let self = Object.getPrototypeOf(x);

	if( self.constructor==Component ) {
		return ["x4-comp"];
	}

	while (self && self.constructor !== Component ) {
		const clsname:string = self.constructor.name;
		const clsns: string = Object.prototype.hasOwnProperty.call(self.constructor,x4_class_ns_sym) ? self.constructor[x4_class_ns_sym] :  "";
		classes.push( clsns+clsname.toLowerCase() );
		self = Object.getPrototypeOf(self);
	}

	return classes;
}

/**
 * 
 */

export type ComponentContent = Component | Component[] | string | string[] | UnsafeHtml| UnsafeHtml[] | number | boolean;

let gen_id = 1000;

export const makeUniqueComponentId = ( ) => {
	return `x4-${gen_id++}`;
}

/**
 * 
 */

export interface ComponentProps {
	tag?: string;
	ns?: string;
	
	style?: Partial<CSSStyleDeclaration>;
	attrs?: Record<string,string|number|boolean>;
	content?: ComponentContent;
	dom_events?: GlobalDOMEvents;
	cls?: string;
	id?: string;
	ref?: RefType<any>;

	// shortcuts
	width?: string | number;
	height?: string | number;
	disabled?: true,
	hidden?: true,
	flex?: boolean | number;

	tooltip?: string;

    // wrapper
	existingDOM?: HTMLElement;

	//  index signature 
	//	to avoid errors: Type 'X' has no properties in common with type 'Y' 
	//	because all memebers here are optional.
	//	this allow TS to recongnize derived props as ComponentProps
	//[key: string]: any; 
};


/**
 * 
 */

export interface ComponentEvent extends CoreEvent {
}

/**
 * 
 */

export interface ComponentEvents extends EventMap {
}

/**
 * 
 */

@class_ns( "x4" )
export class Component<P extends ComponentProps = ComponentProps, E extends ComponentEvents = ComponentEvents> 
		extends CoreElement<E> {

	readonly dom: Element;
	readonly props: P;
	protected readonly clsprefix: string;	// internal class name prefix (x4 internal)

	#store: Map<string|symbol,any>;

	constructor( props: P ) {
		super( );

		this.props = props;	// copy ?

		if( props.existingDOM ) {
			this.dom = props.existingDOM;
		}
		else {
			if( props.ns ) {
				this.dom = document.createElementNS( props.ns, props.tag ?? "div" );
			}
			else {
				this.dom = document.createElement( props.tag ?? "div" );
			}

			if (props.attrs) {
				this.setAttributes( props.attrs );
			}

			if( props.cls ) {
				this.addClass( props.cls );
			}

			if( props.hidden ) {
				this.show( false );
			}

			if( props.flex===true ) {
				this.addClass( "x4flex" );
			}
			else if( props.flex!==undefined ) {
				this.setStyle( {
					"flexGrow": props.flex+""
				});
			}

			if( props.id!==undefined ) {
				this.setAttribute( "id", props.id );
			}

			// small shortcut
			if( props.width!==undefined ) {
				this.setStyleValue( "width", props.width );
			}

			if( props.height!==undefined ) {
				this.setStyleValue( "height", props.height );
			}

			if( props.tooltip ) {
				this.setAttribute( "tooltip", props.tooltip );
			}

			if( props.style ) {
				this.setStyle( props.style );
			}

			if( props.content ) {
				this.setContent( props.content );
			}

			if( props.dom_events ) {
				this.setDOMEvents( props.dom_events );
			}

			const classes = genClassNames( this );
			this.dom.classList.add( ...classes );

			// need to have children for next statements
			// and children way be created in caller
			if( props.disabled ) {
				this.addDOMEvent( "created", ( ) => {
					this.enable( false );
				} );
			}
		}

		(this.dom as any)[COMPONENT] = this;
	}


	// :: CLASSES ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * 
	 */

	hasClass( cls: string ) {
		return this.dom.classList.contains( cls );
	}

	/**
	 * 
	 */

	addClass( cls: string ) {
		if( !cls ) return;
				
		if( cls.indexOf(' ')>=0 ) {
			cls = cls.trim( );
			const ccs = cls.split( " " );
			this.dom.classList.add(...ccs);
		}
		else {
			this.dom.classList.add(cls);
		}
	}

	/**
	 * special case: '*' mean clear class list
	 */

	removeClass( cls: string ) {
		if( !cls ) return;

		if( cls=='*' ) {
			this.dom.classList.value = "";
			return;
		}
		
		if( cls.indexOf(' ')>=0 ) {
			const ccs = cls.split( " " );
			this.dom.classList.remove(...ccs);
		}
		else {
			this.dom.classList.remove(cls);
		}
	}

	/**
	 * 
	 */

	removeClassEx( re: RegExp ) {
		const all = Array.from( this.dom.classList );
		all.forEach( x => {
			if( x.match(re) ) {
				this.dom.classList.remove( x );
			}
		});
	}

	/**
	 * 
	 */

	toggleClass( cls: string ) {
		if( !cls ) return;
		
		const toggle = ( x: string ) => {
			this.dom.classList.toggle(x);
		}

		if( cls.indexOf(' ')>=0 ) {
			const ccs = cls.split( " " );
			ccs.forEach( toggle );
		}
		else {
			toggle( cls );
		}
	}

	/**
	 * 
	 */

	setClass( cls: string, set: boolean = true ) : this {
		if( set ) this.addClass(cls);
		else this.removeClass( cls );
		return this;
	}

	// :: ATTRIBUTES ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * attributes
	 */

	setAttributes( attrs: ComponentAttributes ): this {
		for( const name in attrs ) {
			this.setAttribute( name, attrs[name] );
		}
		return this;
	}

	/**
	 * 
	 */
	
	setAttribute( name: string, value: string | number | boolean ) {
		if( value===null || value===undefined ) {
			this.dom.removeAttribute( name );
		}
		else {
			this.dom.setAttribute( name, ""+value );
		}
	}

	/**
	 * 
	 */

	getAttribute( name: string ): string {
		return this.dom.getAttribute( name );
	}

	/**
	 * 
	 */

	getData( name: string ) : string {
		return this.getAttribute( "data-"+name );
	}

	/**
	 * @returns undefined if not a number
	 */
	getIntData( name: string ) : number {
		const v = parseInt( this.getAttribute( "data-"+name ) );
		if( Number.isFinite(v) ) {
			return v;
		}

		return undefined;
	}

	/**
	 * 
	 */

	setData( name: string, value: string ) {
		return this.setAttribute( "data-"+name, value );
	}

	/**
	 * idem as setData but onot on dom, you can store anything 
	 */

	setInternalData( name: string|symbol, value: any ): this {
		if( !this.#store ) {
			this.#store = new Map( );
		}

		this.#store.set( name, value );
		return this;
	}

	getInternalData( name: string|symbol ): any {
		return this.#store?.get(name);
	}

	
	// :: DOM EVENTS ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * 
	 */

	addDOMEvent<K extends keyof GlobalDOMEvents>( name: K, listener: GlobalDOMEvents[K], prepend = false ) {
		addEvent( this.dom, name, listener as DOMEventHandler, prepend );
	}

	/**
	 * 
	 */

	setDOMEvents( events: GlobalDOMEvents ) {
		for( const name in events ) {
			this.addDOMEvent( name as any, (events as any)[name] );
		}
	}

	// :: HILEVEL EVENTS ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * tool to move named events to internal event map
	 * @internal
	 */
	
	protected mapPropEvents<N extends keyof E>(props: P, ...elements: N[] ) {
		const p = props as any;
		elements.forEach( n => {
			if (Object.prototype.hasOwnProperty.call(p,n) && p[n]) {
				this.on( n, p[n] );
			}
		});
	}

	// :: CONTENT ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * remove all content from component
	 */

	clearContent( ) {
		const d = this.dom;
		while( d.firstChild ) {
			d.removeChild( d.firstChild );
		}
	}

	/**
	 * change the whole content of the component
	 * clear the content before
	 * @param content new content
	 */

	setContent( content: ComponentContent ) {
		this.clearContent( );
		this.appendContent( content );
	}

	/**
	 * cf. appendContent
	 * @param content content to append
	 */

	appendContent( content: ComponentContent ) {
		const set = ( d: any, c: Component | string | UnsafeHtml | number | boolean ) => {
	
			if (c instanceof Component ) {
				d.appendChild( c.dom );
			}
			else if( c instanceof UnsafeHtml) {
				d.insertAdjacentHTML( 'beforeend' , c.toString() );
			}
			else if (typeof c === "string" || typeof c === "number") {
				const tnode = document.createTextNode(c.toString());
				d.appendChild( tnode );
			}
			else if( c ) {
				console.warn("Unknown type to append: ", c);
			}
		}

		if( !isArray(content) ) {
			set( this.dom, content );
		}
		else if( content.length<=8 ) {
			for( const c of content ) {
				set( this.dom, c );
			}
		}
		else {
			const fragment = document.createDocumentFragment( );
			for (const child of content ) {
				set( fragment, child );
			}

			this.dom.appendChild( fragment );
		}
	}		

	/**
	 * cf. appendContent
	 * @param content content to append
	 */

	prependContent( content: ComponentContent ) {
		const d = this.dom;
		const set = ( c: Component | string | UnsafeHtml | number | boolean ) => {
			if (c instanceof Component ) {
				d.insertAdjacentElement( 'afterbegin', c.dom );
			}
			else if( c instanceof UnsafeHtml) {
				d.insertAdjacentHTML( 'afterbegin', c.toString() );
			}
			else if (typeof c === "string" || typeof c === "number") {
				d.insertAdjacentText( 'afterbegin', c.toString() );
			}
			else {
				console.warn("Unknown type to append: ", c);
			}
		}

		if( !isArray(content) ) {
			set( content );
		}
		else {
			const fragment = document.createDocumentFragment( );
			for (const child of content ) {
				set( child );
			}

			d.insertBefore( d.firstChild, fragment );
		}
	}

	/**
	 * remove a single child
	 * @see clearContent
	 */

	removeChild( child: Component ) {
		this.dom.removeChild( child.dom );
	}

	
	/**
	 * query all elements by selector
	 */

	queryAll( selector: string ): Component[] {
		const all = this.dom.querySelectorAll( selector );
		const rc = new Array( all.length );
		all.forEach( (x,i) => rc[i]=wrapDOM(x as HTMLElement) );
		return rc;
	}

	/**
	 * 
	 */
	
	query<T extends Component = Component>( selector: string ): T {
		const r = this.dom.querySelector( selector );
		return componentFromDOM<T>(r);
	}


	// :: STYLES ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	
	/**
	 * 
	 */
	
	setAria( name: keyof ariaValues, value: string | number | boolean ): this {
		this.setAttribute( name, value );
		return this;
	}


	/**
	 * 
	 */

	setStyle( style: Partial<CSSStyleDeclaration> ): this {
		const _style = (this.dom as HTMLElement).style;

		for( const name in style ) {
			
			let value = style[name];
			if( !unitless[name] && (isNumber(value) || RE_NUMBER.test(value)) ) {
				value += "px";
			}

			_style[name] = value;
		}

		return this;
	}

	/**
	 * 
	 */

	setStyleValue<K extends keyof CSSStyleDeclaration>( name: K, value: CSSStyleDeclaration[K] | number ): this {
		
		const _style = (this.dom as HTMLElement).style;

		if( isNumber(value) ) {
			let v = value+"";
			if( !unitless[name as string] ) {
				v += "px";
			}
			
			(_style as any)[name] = v;
		}
		else {
			_style[name] = value;
		}

		return this;
	}

	/**
	 * 
	 * @param name 
	 * @returns 
	 */

	getStyleValue<K extends keyof CSSStyleDeclaration>( name: K ) {
		const _style = (this.dom as HTMLElement).style;
		return _style[name];
	}

	setWidth( w: number | string ) {
		this.setStyleValue( "width", isNumber(w) ? w+"px" : w );
	}

	setHeight( h: number | string ) {
		this.setStyleValue( "height", isNumber(h) ? h+"px" : h );
	}

	/**
	 * 
	 */

	setStyleVariable( name: string, value: string ) {
		(this.dom as HTMLElement).style.setProperty( name, value );
	}

	/**
	 * 
	 */

	getStyleVariable( name: string ) {
		const style = this.getComputedStyle( );
		return style.getPropertyValue( name );
	}

	/**
	 * 
	 * @returns 
	 */

	getComputedStyle( ) {
		return getComputedStyle( this.dom );
	}

	/**
	 * 
	 */

	setCapture( pointerId: number ) {
		this.dom.setPointerCapture( pointerId );
	}

	/**
	 * 
	 */

	releaseCapture( pointerId: number ) {
		this.dom.releasePointerCapture( pointerId );
	}

	/**
	 * 
	 */

	getBoundingRect( ): Rect {
		const rc = this.dom.getBoundingClientRect( );
		return new Rect( rc.x, rc.y, rc.width, rc.height );
	}

	// :: MISC ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * 
	 */

	focus( ): this {
		(this.dom as HTMLElement).focus( );
		return this;
	}

	hasFocus( ) {
		return document.activeElement==this.dom;
	}

	/**
	 * 
	 */

	scrollIntoView(arg?: boolean | ScrollIntoViewOptions) {
		this.dom.scrollIntoView(arg);
	}

	/**
	 * 
	 */

	isVisible( ) {
		return (this.dom as HTMLElement).offsetParent !== null;
	}

	/**
	 * 
	 */

	show( vis = true ): this {
		this.setClass( 'x4hidden', !vis );
		return this;
	}

	/**
	 * 
	 */

	hide( ): this {
		this.show( false );
		return this;
	}

	/**
	 * enable or disable a component (all sub HTMLElement will be also disabled)
	 */

	enable( ena = true ): this {
		this.setAttribute( "disabled", !ena ? 'true' : null );

		if( this.dom instanceof HTMLInputElement || this.dom instanceof HTMLButtonElement ) {
			this.dom.disabled = !ena;
		}

		// propagate diable state to all input children
		const nodes = this.enumChildNodes( true );
		nodes.forEach( x => {
			if( x instanceof HTMLInputElement || x instanceof HTMLButtonElement ) {
				x.disabled = !ena;
			}
		});

		return this;
	}

	/**
	 * 
	 */

	disable( ): this {
		this.enable( false );
		return this;
	}

	/**
	 * check if element is marked disabled
	 */

	isDisabled( ) {
		return this.getAttribute('disabled');
	}

	/**
	 * 
	 */

	nextElement<T extends Component = Component>( ): T {
		const nxt = this.dom.nextElementSibling;
		return componentFromDOM<T>( nxt );
	}

	/**
	 * 
	 * @returns 
	 */

	prevElement<T extends Component = Component>( ): T {
		const nxt = this.dom.previousElementSibling;
		return componentFromDOM<T>( nxt );
	}

	/**
	 * search for parent that match the given contructor 
	 */

	parentElement<T extends Component>( cls?: Constructor<T> ): T {
		return Component.parentElement<T>( this.dom, cls );	
	}

	/**
	 * search for parent that match the given contructor 
	 */
	
	static parentElement<T extends Component>( dom: Node, cls?: Constructor<T> ): T {

		while( dom.parentElement ) {
			const cp = componentFromDOM( dom.parentElement );
			if( !cls ) {
				return cp as T;
			}

			if( cp && cp instanceof cls ) {
				return cp;
			}

			dom = dom.parentElement;
		}

		return null;
	}

	/**
	 * 
	 * @returns 
	 */

	firstChild<T extends Component = Component>( ) : T {
		const nxt = this.dom.firstElementChild;
		return componentFromDOM<T>( nxt );
	}

	/**
	 * 
	 * @returns 
	 */

	lastChild<T extends Component = Component>( ) : T {
		const nxt = this.dom.lastElementChild;
		return componentFromDOM( nxt );
	}

	/**
	 * renvoie la liste des Composants enfants
	 */

	enumChildComponents( recursive: boolean ) {

		const children: Component[] = [];
		
		const nodes = this.enumChildNodes( recursive );
		nodes.forEach( ( c: Node ) => {
			const cc = componentFromDOM( c as HTMLElement );
			if( cc ) {
				children.push(cc);
			}
		} );

		return children;
	}

	/**
	 * return children list of node (not all should be components)
	 */

	enumChildNodes( recursive: boolean ) {
		const children: Node[] = Array.from( recursive ? this.dom.querySelectorAll( '*' ) : this.dom.children );
		return children;
	}

	/**
	 * 
	 */

	animate( keyframes: Keyframe[], duration: number ) {
		this.dom.animate(keyframes,duration);
	}


	// :: TSX/REACT ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * called by the compiler when a jsx element is seen
	 */

	static createElement( clsOrTag: string | ComponentConstructor | symbol | CreateComponentCallBack, attrs: any, ...children: Component[] ): Component | Component[] {

		let comp: Component;

		// fragment
		if( clsOrTag==this.createFragment || clsOrTag===FRAGMENT ) {
			return children;
		}

		// class constructor, yes : dirty
		if( clsOrTag instanceof Function ) {
			attrs = attrs ?? {};
			if( !attrs.children && children && children.length ) {
				attrs.content = children;
			}

			comp = new (clsOrTag as any)( attrs ?? {} );
		}
		// basic tag
		else {
			comp = new Component( {
				tag: clsOrTag,
				content: children,
				...attrs,
			});
		}

		if( children && children.length ) {
			//comp.setContent( children );
		}

		return comp;
	}

	/**
	 * 
	 */

	static createFragment( ): Component[] {
		return this.createElement( FRAGMENT, null ) as Component[];
	}

	// :: SPECIALS ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

	/**
	 * system interfaces:
	 * 	"form-element"
	 * 	"tab-handler"
	 * 
	 * each app can create it's own interface
	 */

	queryInterface<T>( name: string ): T {
		return null;
	}
}  


/**
 * 
 */

type ComponentConstructor = {
	new(...params: any[]): Component;
};

/**
 * get a component element from it's DOM counterpart
 */

export function componentFromDOM<T extends Component = Component>( node: Element ) {
	return node ? (node as any)[COMPONENT] as T : null;
}

/**
 * create a component from an existing DOM
 */

export function wrapDOM( el: HTMLElement ): Component {
	const com = componentFromDOM(el);
	if( com ) {
		return com;
	}

	return new Component( { existingDOM: el } );
}


// :: Special components ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

// just a flexible element that push other
export class Flex extends Component {
	constructor( ) {
		super({})
	}
}

// just a spacer element that push other
export class Space extends Component {
	constructor( width?: number|string, cls?: string ) {
		super( { width, cls } )
	}
}


// :: HIGH LEVEL BASIC EVENTS ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::



/**
 * Click Event
 * click event do not have any additional parameters
 */

export interface EvClick extends ComponentEvent {
}

/**
 * Change Event
 * value is the the element value
 */

export interface EvChange extends ComponentEvent {
	readonly value: any;
}

/**
 * Focus event
 */

export interface EvFocus extends ComponentEvent {
	readonly focus_out: boolean;
}

/**
 * Selection Event
 * value is the new selection or null
 */

interface ISelection {
}

export interface EvSelectionChange extends ComponentEvent {
	readonly selection: ISelection;
	readonly empty: boolean;
}


/**
 * ContextMenu Event
 */

export interface EvContextMenu extends ComponentEvent {
	uievent: UIEvent;	// UI event that fire this event
}

/**
 * Drag/Drop event
 */

export interface EvDrag extends ComponentEvent {
	element: unknown;
	data: any;
}

/**
 * Errors
 */

export interface EvError extends ComponentEvent {
	code: number;
	message: string;
}

/**
 * DblClick Event
 */

export interface EvDblClick extends ComponentEvent {
}