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component.ts
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component.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
// We are temporarily importing the existing viewEngine from core so we can be sure we are
// correctly implementing its interfaces for backwards compatibility.
import {Injector} from '../di/injector';
import {ComponentRef as viewEngine_ComponentRef} from '../linker/component_factory';
import {EmbeddedViewRef as viewEngine_EmbeddedViewRef} from '../linker/view_ref';
import {assertNotNull} from './assert';
import {ComponentDef, ComponentType} from './definition_interfaces';
import {NG_HOST_SYMBOL, createError, createLView, directive, enterView, hostElement, leaveView, locateHostElement, renderComponentOrTemplate} from './instructions';
import {LElementNode} from './interfaces';
import {RElement, Renderer3, RendererFactory3, domRendererFactory3} from './renderer';
import {notImplemented, stringify} from './util';
/** Options that control how the component should be bootstrapped. */
export interface CreateComponentOptions {
/** Which renderer factory to use. */
rendererFactory?: RendererFactory3;
/**
* Host element on which the component will be bootstrapped. If not specified,
* the component definition's `tag` is used to query the existing DOM for the
* element to bootstrap.
*/
host?: RElement|string;
/** Module injector for the component. If unspecified, the injector will be NULL_INJECTOR. */
injector?: Injector;
/**
* List of features to be applied to the created component. Features are simply
* functions that decorate a component with a certain behavior.
*
* Example: PublicFeature is a function that makes the component public to the DI system.
*/
features?: (<T>(component: T, componentDef: ComponentDef<T>) => void)[];
}
/**
* Bootstraps a component, then creates and returns a `ComponentRef` for that component.
*
* @param componentType Component to bootstrap
* @param options Optional parameters which control bootstrapping
*/
export function createComponentRef<T>(
componentType: ComponentType<T>, opts: CreateComponentOptions): viewEngine_ComponentRef<T> {
const component = renderComponent(componentType, opts);
const hostView = createViewRef(() => detectChanges(component), component);
return {
location: {nativeElement: getHostElement(component)},
injector: opts.injector || NULL_INJECTOR,
instance: component,
hostView: hostView,
changeDetectorRef: hostView,
componentType: componentType,
// TODO: implement destroy and onDestroy
destroy: () => {},
onDestroy: (cb: Function) => {}
};
}
/**
* Creates an EmbeddedViewRef.
*
* @param detectChanges The detectChanges function for this view
* @param context The context for this view
* @returns The EmbeddedViewRef
*/
function createViewRef<T>(detectChanges: () => void, context: T): EmbeddedViewRef<T> {
return addDestroyable(new EmbeddedViewRef(detectChanges), context);
}
class EmbeddedViewRef<T> implements viewEngine_EmbeddedViewRef<T> {
// TODO: rootNodes should be replaced when properly implemented
rootNodes = null !;
context: T;
destroyed: boolean;
constructor(public detectChanges: () => void) {}
// inherited from core/ChangeDetectorRef
markForCheck() {
if (ngDevMode) {
throw notImplemented();
}
}
detach() {
if (ngDevMode) {
throw notImplemented();
}
}
checkNoChanges() {
if (ngDevMode) {
throw notImplemented();
}
}
reattach() {
if (ngDevMode) {
throw notImplemented();
}
}
destroy(): void {}
onDestroy(cb: Function): void {}
}
/** Interface for destroy logic. Implemented by addDestroyable. */
interface DestroyRef<T> {
context: T;
/** Whether or not this object has been destroyed */
destroyed: boolean;
/** Destroy the instance and call all onDestroy callbacks. */
destroy(): void;
/** Register callbacks that should be called onDestroy */
onDestroy(cb: Function): void;
}
/**
* Decorates an object with destroy logic (implementing the DestroyRef interface)
* and returns the enhanced object.
*
* @param obj The object to decorate
* @returns The object with destroy logic
*/
function addDestroyable<T, C>(obj: any, context: C): T&DestroyRef<C> {
let destroyFn: Function[]|null = null;
obj.destroyed = false;
obj.destroy = function() {
destroyFn && destroyFn.forEach((fn) => fn());
this.destroyed = true;
};
obj.onDestroy = (fn: Function) => (destroyFn || (destroyFn = [])).push(fn);
obj.context = context;
return obj;
}
// TODO: A hack to not pull in the NullInjector from @angular/core.
export const NULL_INJECTOR: Injector = {
get: (token: any, notFoundValue?: any) => {
throw new Error('NullInjector: Not found: ' + stringify(token));
}
};
/**
* Bootstraps a Component into an existing host element and returns an instance
* of the component.
*
* @param componentType Component to bootstrap
* @param options Optional parameters which control bootstrapping
*/
export function renderComponent<T>(
componentType: ComponentType<T>, opts: CreateComponentOptions = {}): T {
const rendererFactory = opts.rendererFactory || domRendererFactory3;
const componentDef = componentType.ngComponentDef;
let component: T;
const hostNode = locateHostElement(rendererFactory, opts.host || componentDef.tag);
const oldView = enterView(
createLView(-1, rendererFactory.createRenderer(hostNode, componentDef.rendererType), []),
null !);
try {
// Create element node at index 0 in data array
hostElement(hostNode, componentDef);
// Create directive instance with n() and store at index 1 in data array (el is 0)
component = directive(1, componentDef.n(), componentDef);
} finally {
leaveView(oldView);
}
opts.features && opts.features.forEach((feature) => feature(component, componentDef));
detectChanges(component);
return component;
}
export function detectChanges<T>(component: T) {
ngDevMode && assertNotNull(component, 'component');
const hostNode = (component as any)[NG_HOST_SYMBOL] as LElementNode;
if (ngDevMode && !hostNode) {
createError('Not a directive instance', component);
}
ngDevMode && assertNotNull(hostNode.data, 'hostNode.data');
renderComponentOrTemplate(hostNode, hostNode.view, component);
isDirty = false;
}
let isDirty = false;
export function markDirty<T>(
component: T, scheduler: (fn: () => void) => void = requestAnimationFrame) {
ngDevMode && assertNotNull(component, 'component');
if (!isDirty) {
isDirty = true;
scheduler(() => detectChanges(component));
}
}
export function getHostElement<T>(component: T): RElement {
return ((component as any)[NG_HOST_SYMBOL] as LElementNode).native;
}