angular-docs-cn/modules/angular2/src/platform/browser/testability.ts

import {Map, MapWrapper, ListWrapper} from 'angular2/src/facade/collection';
import {CONST, CONST_EXPR, global, isPresent} from 'angular2/src/facade/lang';
import {BaseException, WrappedException} from 'angular2/src/facade/exceptions';
import {PromiseWrapper, ObservableWrapper} from 'angular2/src/facade/async';

import {DOM} from 'angular2/src/core/dom/dom_adapter';

import {
  Injectable,
  TestabilityRegistry,
  Testability,
  GetTestability,
  setTestabilityGetter
} from 'angular2/core';

class PublicTestability {
  /** @internal */
  _testability: Testability;

  constructor(testability: Testability) { this._testability = testability; }

  isStable(): boolean { return this._testability.isStable(); }

  whenStable(callback: Function) { this._testability.whenStable(callback); }

  findBindings(using: any, provider: string, exactMatch: boolean): any[] {
    return this.findProviders(using, provider, exactMatch);
  }

  findProviders(using: any, provider: string, exactMatch: boolean): any[] {
    return this._testability.findBindings(using, provider, exactMatch);
  }
}

export class BrowserGetTestability implements GetTestability {
  static init() { setTestabilityGetter(new BrowserGetTestability()); }

  addToWindow(registry: TestabilityRegistry): void {
    global.getAngularTestability = (elem: any, findInAncestors: boolean = true) => {
      var testability = registry.findTestabilityInTree(elem, findInAncestors);
      if (testability == null) {
        throw new Error('Could not find testability for element.');
      }
      return new PublicTestability(testability);
    };

    global.getAllAngularTestabilities = () => {
      var testabilities = registry.getAllTestabilities();
      return testabilities.map((testability) => { return new PublicTestability(testability); });
    };
  }

  findTestabilityInTree(registry: TestabilityRegistry, elem: any,
                        findInAncestors: boolean): Testability {
    if (elem == null) {
      return null;
    }
    var t = registry.getTestability(elem);
    if (isPresent(t)) {
      return t;
    } else if (!findInAncestors) {
      return null;
    }
    if (DOM.isShadowRoot(elem)) {
      return this.findTestabilityInTree(registry, DOM.getHost(elem), true);
    }
    return this.findTestabilityInTree(registry, DOM.parentElement(elem), true);
  }
}