angular-docs-cn/modules/@angular/platform-browser/src/browser.ts

import {FORM_PROVIDERS, PlatformLocation} from '@angular/common';
import {APPLICATION_COMMON_PROVIDERS, ExceptionHandler, OpaqueToken, PLATFORM_COMMON_PROVIDERS, PLATFORM_INITIALIZER, PlatformRef, ReflectiveInjector, RootRenderer, Testability, assertPlatform, createPlatform, getPlatform} from '@angular/core';

import {AnimationDriver, NoOpAnimationDriver, SanitizationService, wtfInit} from '../core_private';
import {WebAnimationsDriver} from '../src/dom/web_animations_driver';

import {BrowserDomAdapter} from './browser/browser_adapter';
import {BrowserPlatformLocation} from './browser/location/browser_platform_location';
import {BrowserGetTestability} from './browser/testability';
import {ELEMENT_PROBE_PROVIDERS} from './dom/debug/ng_probe';
import {getDOM} from './dom/dom_adapter';
import {DomRootRenderer, DomRootRenderer_} from './dom/dom_renderer';
import {DOCUMENT} from './dom/dom_tokens';
import {DomEventsPlugin} from './dom/events/dom_events';
import {EVENT_MANAGER_PLUGINS, EventManager} from './dom/events/event_manager';
import {HAMMER_GESTURE_CONFIG, HammerGestureConfig, HammerGesturesPlugin} from './dom/events/hammer_gestures';
import {KeyEventsPlugin} from './dom/events/key_events';
import {DomSharedStylesHost, SharedStylesHost} from './dom/shared_styles_host';
import {isBlank} from './facade/lang';
import {DomSanitizationService, DomSanitizationServiceImpl} from './security/dom_sanitization_service';


const BROWSER_PLATFORM_MARKER = new OpaqueToken('BrowserPlatformMarker');

/**
 * A set of providers to initialize the Angular platform in a web browser.
 *
 * Used automatically by `bootstrap`, or can be passed to {@link platform}.
 */
export const BROWSER_PLATFORM_PROVIDERS: Array<any /*Type | Provider | any[]*/> = [
  {provide: BROWSER_PLATFORM_MARKER, useValue: true}, PLATFORM_COMMON_PROVIDERS,
  {provide: PLATFORM_INITIALIZER, useValue: initDomAdapter, multi: true},
  {provide: PlatformLocation, useClass: BrowserPlatformLocation}
];

export const BROWSER_SANITIZATION_PROVIDERS: Array<any> = [
  {provide: SanitizationService, useExisting: DomSanitizationService},
  {provide: DomSanitizationService, useClass: DomSanitizationServiceImpl},
];

/**
 * A set of providers to initialize an Angular application in a web browser.
 *
 * Used automatically by `bootstrap`, or can be passed to {@link PlatformRef.application}.
 */
export const BROWSER_APP_PROVIDERS: Array<any /*Type | Provider | any[]*/> = [
  APPLICATION_COMMON_PROVIDERS, FORM_PROVIDERS, BROWSER_SANITIZATION_PROVIDERS,
  {provide: ExceptionHandler, useFactory: _exceptionHandler, deps: []},
  {provide: DOCUMENT, useFactory: _document, deps: []},
  {provide: EVENT_MANAGER_PLUGINS, useClass: DomEventsPlugin, multi: true},
  {provide: EVENT_MANAGER_PLUGINS, useClass: KeyEventsPlugin, multi: true},
  {provide: EVENT_MANAGER_PLUGINS, useClass: HammerGesturesPlugin, multi: true},
  {provide: HAMMER_GESTURE_CONFIG, useClass: HammerGestureConfig},
  {provide: DomRootRenderer, useClass: DomRootRenderer_},
  {provide: RootRenderer, useExisting: DomRootRenderer},
  {provide: SharedStylesHost, useExisting: DomSharedStylesHost},
  {provide: AnimationDriver, useFactory: _resolveDefaultAnimationDriver}, DomSharedStylesHost,
  Testability, EventManager, ELEMENT_PROBE_PROVIDERS
];


export function browserPlatform(): PlatformRef {
  if (isBlank(getPlatform())) {
    createPlatform(ReflectiveInjector.resolveAndCreate(BROWSER_PLATFORM_PROVIDERS));
  }
  return assertPlatform(BROWSER_PLATFORM_MARKER);
}

function initDomAdapter() {
  BrowserDomAdapter.makeCurrent();
  wtfInit();
  BrowserGetTestability.init();
}

function _exceptionHandler(): ExceptionHandler {
  return new ExceptionHandler(getDOM());
}

function _document(): any {
  return getDOM().defaultDoc();
}

function _resolveDefaultAnimationDriver(): AnimationDriver {
  if (getDOM().supportsWebAnimation()) {
    return new WebAnimationsDriver();
  }
  return new NoOpAnimationDriver();
}