110 lines
3.0 KiB
TypeScript
110 lines
3.0 KiB
TypeScript
/*
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Copyright 2025 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {
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Binding,
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ComponentRef,
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Directive,
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DOCUMENT,
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effect,
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inject,
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input,
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inputBinding,
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OnDestroy,
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PLATFORM_ID,
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Type,
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untracked,
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ViewContainerRef,
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} from '@angular/core';
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import { Types, Styles } from '@a2ui/lit/0.8';
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import { Catalog } from './catalog';
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import { isPlatformBrowser } from '@angular/common';
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@Directive({
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selector: 'ng-container[a2ui-renderer]',
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})
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export class Renderer implements OnDestroy {
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private viewContainerRef = inject(ViewContainerRef);
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private catalog = inject(Catalog);
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private static hasInsertedStyles = false;
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private currentRef: ComponentRef<unknown> | null = null;
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private isDestroyed = false;
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readonly surfaceId = input.required<Types.SurfaceID>();
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readonly component = input.required<Types.AnyComponentNode>();
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constructor() {
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effect(() => {
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const surfaceId = this.surfaceId();
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const component = this.component();
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untracked(() => this.render(surfaceId, component));
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});
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const platformId = inject(PLATFORM_ID);
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const document = inject(DOCUMENT);
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if (!Renderer.hasInsertedStyles && isPlatformBrowser(platformId)) {
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const styles = document.createElement('style');
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styles.textContent = Styles.structuralStyles;
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document.head.appendChild(styles);
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Renderer.hasInsertedStyles = true;
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}
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}
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ngOnDestroy(): void {
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this.isDestroyed = true;
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this.clear();
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}
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private async render(surfaceId: Types.SurfaceID, component: Types.AnyComponentNode) {
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const config = this.catalog[component.type];
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let newComponent: Type<unknown> | null = null;
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let componentBindings: Binding[] | null = null;
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if (typeof config === 'function') {
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newComponent = await config();
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} else if (typeof config === 'object') {
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newComponent = await config.type();
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componentBindings = config.bindings(component as any);
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}
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this.clear();
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if (newComponent && !this.isDestroyed) {
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const bindings = [
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inputBinding('surfaceId', () => surfaceId),
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inputBinding('component', () => component),
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inputBinding('weight', () => component.weight ?? 'initial'),
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];
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if (componentBindings) {
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bindings.push(...componentBindings);
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}
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this.currentRef = this.viewContainerRef.createComponent(newComponent, {
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bindings,
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injector: this.viewContainerRef.injector,
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});
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}
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}
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private clear() {
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this.currentRef?.destroy();
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this.currentRef = null;
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}
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}
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