/
dom_renderer.ts
319 lines (269 loc) Β· 11 KB
/
dom_renderer.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
*/
import {APP_ID, Inject, Injectable, Renderer2, RendererFactory2, RendererStyleFlags2, RendererType2, ViewEncapsulation} from '@angular/core';
import {EventManager} from './events/event_manager';
import {DomSharedStylesHost} from './shared_styles_host';
export const NAMESPACE_URIS: {[ns: string]: string} = {
'svg': 'http://www.w3.org/2000/svg',
'xhtml': 'http://www.w3.org/1999/xhtml',
'xlink': 'http://www.w3.org/1999/xlink',
'xml': 'http://www.w3.org/XML/1998/namespace',
'xmlns': 'http://www.w3.org/2000/xmlns/',
};
const COMPONENT_REGEX = /%COMP%/g;
const NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode;
export const COMPONENT_VARIABLE = '%COMP%';
export const HOST_ATTR = `_nghost-${COMPONENT_VARIABLE}`;
export const CONTENT_ATTR = `_ngcontent-${COMPONENT_VARIABLE}`;
export function shimContentAttribute(componentShortId: string): string {
return CONTENT_ATTR.replace(COMPONENT_REGEX, componentShortId);
}
export function shimHostAttribute(componentShortId: string): string {
return HOST_ATTR.replace(COMPONENT_REGEX, componentShortId);
}
export function flattenStyles(
compId: string, styles: Array<any|any[]>, target: string[]): string[] {
for (let i = 0; i < styles.length; i++) {
let style = styles[i];
if (Array.isArray(style)) {
flattenStyles(compId, style, target);
} else {
style = style.replace(COMPONENT_REGEX, compId);
target.push(style);
}
}
return target;
}
function decoratePreventDefault(eventHandler: Function): Function {
// `DebugNode.triggerEventHandler` needs to know if the listener was created with
// decoratePreventDefault or is a listener added outside the Angular context so it can handle the
// two differently. In the first case, the special '__ngUnwrap__' token is passed to the unwrap
// the listener (see below).
return (event: any) => {
// Ivy uses '__ngUnwrap__' as a special token that allows us to unwrap the function
// so that it can be invoked programmatically by `DebugNode.triggerEventHandler`. The debug_node
// can inspect the listener toString contents for the existence of this special token. Because
// the token is a string literal, it is ensured to not be modified by compiled code.
if (event === '__ngUnwrap__') {
return eventHandler;
}
const allowDefaultBehavior = eventHandler(event);
if (allowDefaultBehavior === false) {
// TODO(tbosch): move preventDefault into event plugins...
event.preventDefault();
event.returnValue = false;
}
return undefined;
};
}
@Injectable()
export class DomRendererFactory2 implements RendererFactory2 {
private rendererByCompId = new Map<string, Renderer2>();
private defaultRenderer: Renderer2;
constructor(
private eventManager: EventManager, private sharedStylesHost: DomSharedStylesHost,
@Inject(APP_ID) private appId: string) {
this.defaultRenderer = new DefaultDomRenderer2(eventManager);
}
createRenderer(element: any, type: RendererType2|null): Renderer2 {
if (!element || !type) {
return this.defaultRenderer;
}
switch (type.encapsulation) {
case ViewEncapsulation.Emulated: {
let renderer = this.rendererByCompId.get(type.id);
if (!renderer) {
renderer = new EmulatedEncapsulationDomRenderer2(
this.eventManager, this.sharedStylesHost, type, this.appId);
this.rendererByCompId.set(type.id, renderer);
}
(<EmulatedEncapsulationDomRenderer2>renderer).applyToHost(element);
return renderer;
}
case ViewEncapsulation.Native:
case ViewEncapsulation.ShadowDom:
return new ShadowDomRenderer(this.eventManager, this.sharedStylesHost, element, type);
default: {
if (!this.rendererByCompId.has(type.id)) {
const styles = flattenStyles(type.id, type.styles, []);
this.sharedStylesHost.addStyles(styles);
this.rendererByCompId.set(type.id, this.defaultRenderer);
}
return this.defaultRenderer;
}
}
}
begin() {}
end() {}
}
class DefaultDomRenderer2 implements Renderer2 {
data: {[key: string]: any} = Object.create(null);
constructor(private eventManager: EventManager) {}
destroy(): void {}
destroyNode: null;
createElement(name: string, namespace?: string): any {
if (namespace) {
// In cases where Ivy (not ViewEngine) is giving us the actual namespace, the look up by key
// will result in undefined, so we just return the namespace here.
return document.createElementNS(NAMESPACE_URIS[namespace] || namespace, name);
}
return document.createElement(name);
}
createComment(value: string): any { return document.createComment(value); }
createText(value: string): any { return document.createTextNode(value); }
appendChild(parent: any, newChild: any): void { parent.appendChild(newChild); }
insertBefore(parent: any, newChild: any, refChild: any): void {
if (parent) {
parent.insertBefore(newChild, refChild);
}
}
removeChild(parent: any, oldChild: any): void {
if (parent) {
parent.removeChild(oldChild);
}
}
selectRootElement(selectorOrNode: string|any, preserveContent?: boolean): any {
let el: any = typeof selectorOrNode === 'string' ? document.querySelector(selectorOrNode) :
selectorOrNode;
if (!el) {
throw new Error(`The selector "${selectorOrNode}" did not match any elements`);
}
if (!preserveContent) {
el.textContent = '';
}
return el;
}
parentNode(node: any): any { return node.parentNode; }
nextSibling(node: any): any { return node.nextSibling; }
setAttribute(el: any, name: string, value: string, namespace?: string): void {
if (namespace) {
name = namespace + ':' + name;
// TODO(FW-811): Ivy may cause issues here because it's passing around
// full URIs for namespaces, therefore this lookup will fail.
const namespaceUri = NAMESPACE_URIS[namespace];
if (namespaceUri) {
el.setAttributeNS(namespaceUri, name, value);
} else {
el.setAttribute(name, value);
}
} else {
el.setAttribute(name, value);
}
}
removeAttribute(el: any, name: string, namespace?: string): void {
if (namespace) {
// TODO(FW-811): Ivy may cause issues here because it's passing around
// full URIs for namespaces, therefore this lookup will fail.
const namespaceUri = NAMESPACE_URIS[namespace];
if (namespaceUri) {
el.removeAttributeNS(namespaceUri, name);
} else {
// TODO(FW-811): Since ivy is passing around full URIs for namespaces
// this could result in properties like `http://www.w3.org/2000/svg:cx="123"`,
// which is wrong.
el.removeAttribute(`${namespace}:${name}`);
}
} else {
el.removeAttribute(name);
}
}
addClass(el: any, name: string): void { el.classList.add(name); }
removeClass(el: any, name: string): void { el.classList.remove(name); }
setStyle(el: any, style: string, value: any, flags: RendererStyleFlags2): void {
if (flags & RendererStyleFlags2.DashCase) {
el.style.setProperty(
style, value, !!(flags & RendererStyleFlags2.Important) ? 'important' : '');
} else {
el.style[style] = value;
}
}
removeStyle(el: any, style: string, flags: RendererStyleFlags2): void {
if (flags & RendererStyleFlags2.DashCase) {
el.style.removeProperty(style);
} else {
// IE requires '' instead of null
// see https://github.com/angular/angular/issues/7916
el.style[style] = '';
}
}
setProperty(el: any, name: string, value: any): void {
NG_DEV_MODE && checkNoSyntheticProp(name, 'property');
el[name] = value;
}
setValue(node: any, value: string): void { node.nodeValue = value; }
listen(target: 'window'|'document'|'body'|any, event: string, callback: (event: any) => boolean):
() => void {
NG_DEV_MODE && checkNoSyntheticProp(event, 'listener');
if (typeof target === 'string') {
return <() => void>this.eventManager.addGlobalEventListener(
target, event, decoratePreventDefault(callback));
}
return <() => void>this.eventManager.addEventListener(
target, event, decoratePreventDefault(callback)) as() => void;
}
}
const AT_CHARCODE = (() => '@'.charCodeAt(0))();
function checkNoSyntheticProp(name: string, nameKind: string) {
if (name.charCodeAt(0) === AT_CHARCODE) {
throw new Error(
`Found the synthetic ${nameKind} ${name}. Please include either "BrowserAnimationsModule" or "NoopAnimationsModule" in your application.`);
}
}
class EmulatedEncapsulationDomRenderer2 extends DefaultDomRenderer2 {
private contentAttr: string;
private hostAttr: string;
constructor(
eventManager: EventManager, sharedStylesHost: DomSharedStylesHost,
private component: RendererType2, appId: string) {
super(eventManager);
const styles = flattenStyles(appId + '-' + component.id, component.styles, []);
sharedStylesHost.addStyles(styles);
this.contentAttr = shimContentAttribute(appId + '-' + component.id);
this.hostAttr = shimHostAttribute(appId + '-' + component.id);
}
applyToHost(element: any) { super.setAttribute(element, this.hostAttr, ''); }
createElement(parent: any, name: string): Element {
const el = super.createElement(parent, name);
super.setAttribute(el, this.contentAttr, '');
return el;
}
}
class ShadowDomRenderer extends DefaultDomRenderer2 {
private shadowRoot: any;
constructor(
eventManager: EventManager, private sharedStylesHost: DomSharedStylesHost,
private hostEl: any, private component: RendererType2) {
super(eventManager);
if (component.encapsulation === ViewEncapsulation.ShadowDom) {
this.shadowRoot = (hostEl as any).attachShadow({mode: 'open'});
} else {
this.shadowRoot = (hostEl as any).createShadowRoot();
}
this.sharedStylesHost.addHost(this.shadowRoot);
const styles = flattenStyles(component.id, component.styles, []);
for (let i = 0; i < styles.length; i++) {
const styleEl = document.createElement('style');
styleEl.textContent = styles[i];
this.shadowRoot.appendChild(styleEl);
}
}
private nodeOrShadowRoot(node: any): any { return node === this.hostEl ? this.shadowRoot : node; }
destroy() { this.sharedStylesHost.removeHost(this.shadowRoot); }
appendChild(parent: any, newChild: any): void {
return super.appendChild(this.nodeOrShadowRoot(parent), newChild);
}
insertBefore(parent: any, newChild: any, refChild: any): void {
return super.insertBefore(this.nodeOrShadowRoot(parent), newChild, refChild);
}
removeChild(parent: any, oldChild: any): void {
return super.removeChild(this.nodeOrShadowRoot(parent), oldChild);
}
parentNode(node: any): any {
return this.nodeOrShadowRoot(super.parentNode(this.nodeOrShadowRoot(node)));
}
}