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debug_element.ts

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import {Type, isPresent, BaseException, isBlank} from 'angular2/src/facade/lang';

import {List, ListWrapper, MapWrapper} from 'angular2/src/facade/collection';

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

import {ElementInjector} from 'angular2/src/core/compiler/element_injector';

import {AppView} from 'angular2/src/core/compiler/view';

import {internalView} from 'angular2/src/core/compiler/view_ref';

import {ElementRef} from 'angular2/src/core/compiler/element_ref';

import {resolveInternalDomView} from 'angular2/src/render/dom/view/view';

/**

* @exportedAs angular2/test

*

* An DebugElement contains information from the Angular compiler about an

* element and provides access to the corresponding ElementInjector and

* underlying dom Element, as well as a way to query for children.

*/

export class DebugElement {

_elementInjector: ElementInjector;

constructor(private _parentView: AppView, private _boundElementIndex: number) {

this._elementInjector = this._parentView.elementInjectors[this._boundElementIndex];

}

static create(elementRef: ElementRef): DebugElement {

return new DebugElement(internalView(elementRef.parentView), elementRef.boundElementIndex);

}

get componentInstance(): any {

if (!isPresent(this._elementInjector)) {

return null;

}

return this._elementInjector.getComponent();

}

get domElement(): any {

return resolveInternalDomView(this._parentView.render)

.boundElements[this._boundElementIndex]

.element;

}

get elementRef(): ElementRef { return this._elementInjector.getElementRef(); }

getDirectiveInstance(directiveIndex: number): any {

return this._elementInjector.getDirectiveAtIndex(directiveIndex);

}

/**

* Get child DebugElements from within the Light DOM.

*

* @return {List<DebugElement>}

*/

get children(): List<DebugElement> {

var thisElementBinder = this._parentView.proto.elementBinders[this._boundElementIndex];

return this._getChildElements(this._parentView, thisElementBinder.index);

}

/**

* Get the root DebugElement children of a component. Returns an empty

* list if the current DebugElement is not a component root.

*

* @return {List<DebugElement>}

*/

get componentViewChildren(): List<DebugElement> {

var shadowView = this._parentView.componentChildViews[this._boundElementIndex];

if (!isPresent(shadowView)) {

// The current element is not a component.

return [];

}

return this._getChildElements(shadowView, null);

}

triggerEventHandler(eventName, eventObj): void {

this._parentView.triggerEventHandlers(eventName, eventObj, this._boundElementIndex);

}

hasDirective(type: Type): boolean {

if (!isPresent(this._elementInjector)) {

return false;

}

return this._elementInjector.hasDirective(type);

}

inject(type: Type): any {

if (!isPresent(this._elementInjector)) {

return null;

}

return this._elementInjector.get(type);

}

/**

* Return the first descendant TestElememt matching the given predicate

* and scope.

*

* @param {Function: boolean} predicate

* @param {Scope} scope

*

* @return {DebugElement}

*/

query(predicate: Function, scope = Scope.all): DebugElement {

var results = this.queryAll(predicate, scope);

return results.length > 0 ? results[0] : null;

}

/**

* Return descendant TestElememts matching the given predicate

* and scope.

*

* @param {Function: boolean} predicate

* @param {Scope} scope

*

* @return {List<DebugElement>}

*/

queryAll(predicate: Function, scope = Scope.all): List<DebugElement> {

var elementsInScope = scope(this);

return ListWrapper.filter(elementsInScope, predicate);

}

_getChildElements(view: AppView, parentBoundElementIndex: number): List<DebugElement> {

var els = [];

var parentElementBinder = null;

if (isPresent(parentBoundElementIndex)) {

parentElementBinder = view.proto.elementBinders[parentBoundElementIndex];

}

for (var i = 0; i < view.proto.elementBinders.length; ++i) {

var binder = view.proto.elementBinders[i];

if (binder.parent == parentElementBinder) {

els.push(new DebugElement(view, i));

var views = view.viewContainers[i];

if (isPresent(views)) {

ListWrapper.forEach(views.views, (nextView) => {

els = ListWrapper.concat(els, this._getChildElements(nextView, null));

});

}

}

}

return els;

}

}

export function inspectElement(elementRef: ElementRef): DebugElement {

return DebugElement.create(elementRef);

}

/**

* @exportedAs angular2/test

*/

export class Scope {

static all(debugElement): List<DebugElement> {

var scope = [];

scope.push(debugElement);

ListWrapper.forEach(debugElement.children,

(child) => { scope = ListWrapper.concat(scope, Scope.all(child)); });

ListWrapper.forEach(debugElement.componentViewChildren,

(child) => { scope = ListWrapper.concat(scope, Scope.all(child)); });

return scope;

}

static light(debugElement): List<DebugElement> {

var scope = [];

ListWrapper.forEach(debugElement.children, (child) => {

scope.push(child);

scope = ListWrapper.concat(scope, Scope.light(child));

});

return scope;

}

static view(debugElement): List<DebugElement> {

var scope = [];

ListWrapper.forEach(debugElement.componentViewChildren, (child) => {

scope.push(child);

scope = ListWrapper.concat(scope, Scope.light(child));

});

return scope;

}

}

/**

* @exportedAs angular2/test

*/

export class By {

static all(): Function { return (debugElement) => true; }

static css(selector: string): Function {

return (debugElement) => { return DOM.elementMatches(debugElement.domElement, selector); };

}

static directive(type: Type): Function {

return (debugElement) => { return debugElement.hasDirective(type); };

}

}