angular2
Version:
Angular 2 - a web framework for modern web apps
106 lines • 18.8 kB
JavaScript
import { ListWrapper } from 'angular2/src/facade/collection';
import { unimplemented } from 'angular2/src/facade/exceptions';
import { isPresent } from 'angular2/src/facade/lang';
import { wtfCreateScope, wtfLeave } from '../profile/profile';
/**
* Represents a container where one or more Views can be attached.
*
* The container can contain two kinds of Views. Host Views, created by instantiating a
* {@link Component} via {@link #createComponent}, and Embedded Views, created by instantiating an
* {@link TemplateRef Embedded Template} via {@link #createEmbeddedView}.
*
* The location of the View Container within the containing View is specified by the Anchor
* `element`. Each View Container can have only one Anchor Element and each Anchor Element can only
* have a single View Container.
*
* Root elements of Views attached to this container become siblings of the Anchor Element in
* the Rendered View.
*
* To access a `ViewContainerRef` of an Element, you can either place a {@link Directive} injected
* with `ViewContainerRef` on the Element, or you obtain it via a {@link ViewChild} query.
*/
export class ViewContainerRef {
/**
* Anchor element that specifies the location of this container in the containing View.
* <!-- TODO: rename to anchorElement -->
*/
get element() { return unimplemented(); }
get injector() { return unimplemented(); }
get parentInjector() { return unimplemented(); }
/**
* Returns the number of Views currently attached to this container.
*/
get length() { return unimplemented(); }
;
}
export class ViewContainerRef_ {
constructor(_element) {
this._element = _element;
/** @internal */
this._createComponentInContainerScope = wtfCreateScope('ViewContainerRef#createComponent()');
/** @internal */
this._insertScope = wtfCreateScope('ViewContainerRef#insert()');
/** @internal */
this._removeScope = wtfCreateScope('ViewContainerRef#remove()');
/** @internal */
this._detachScope = wtfCreateScope('ViewContainerRef#detach()');
}
get(index) { return this._element.nestedViews[index].ref; }
get length() {
var views = this._element.nestedViews;
return isPresent(views) ? views.length : 0;
}
get element() { return this._element.elementRef; }
get injector() { return this._element.injector; }
get parentInjector() { return this._element.parentInjector; }
// TODO(rado): profile and decide whether bounds checks should be added
// to the methods below.
createEmbeddedView(templateRef, index = -1) {
var viewRef = templateRef.createEmbeddedView();
this.insert(viewRef, index);
return viewRef;
}
createComponent(componentFactory, index = -1, injector = null, projectableNodes = null) {
var s = this._createComponentInContainerScope();
var contextInjector = isPresent(injector) ? injector : this._element.parentInjector;
var componentRef = componentFactory.create(contextInjector, projectableNodes);
this.insert(componentRef.hostView, index);
return wtfLeave(s, componentRef);
}
// TODO(i): refactor insert+remove into move
insert(viewRef, index = -1) {
var s = this._insertScope();
if (index == -1)
index = this.length;
var viewRef_ = viewRef;
this._element.attachView(viewRef_.internalView, index);
return wtfLeave(s, viewRef_);
}
indexOf(viewRef) {
return ListWrapper.indexOf(this._element.nestedViews, viewRef.internalView);
}
// TODO(i): rename to destroy
remove(index = -1) {
var s = this._removeScope();
if (index == -1)
index = this.length - 1;
var view = this._element.detachView(index);
view.destroy();
// view is intentionally not returned to the client.
wtfLeave(s);
}
// TODO(i): refactor insert+remove into move
detach(index = -1) {
var s = this._detachScope();
if (index == -1)
index = this.length - 1;
var view = this._element.detachView(index);
return wtfLeave(s, view.ref);
}
clear() {
for (var i = this.length - 1; i >= 0; i--) {
this.remove(i);
}
}
}
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Host Views, created by instantiating a\n * {@link Component} via {@link #createComponent}, and Embedded Views, created by instantiating an\n * {@link TemplateRef Embedded Template} via {@link #createEmbeddedView}.\n *\n * The location of the View Container within the containing View is specified by the Anchor\n * `element`. Each View Container can have only one Anchor Element and each Anchor Element can only\n * have a single View Container.\n *\n * Root elements of Views attached to this container become siblings of the Anchor Element in\n * the Rendered View.\n *\n * To access a `ViewContainerRef` of an Element, you can either place a {@link Directive} injected\n * with `ViewContainerRef` on the Element, or you obtain it via a {@link ViewChild} query.\n */\nexport abstract class ViewContainerRef {\n  /**\n   * Anchor element that specifies the location of this container in the containing View.\n   * <!-- TODO: rename to anchorElement -->\n   */\n  get element(): ElementRef { return <ElementRef>unimplemented(); }\n\n  get injector(): Injector { return <Injector>unimplemented(); }\n\n  get parentInjector(): Injector { return <Injector>unimplemented(); }\n\n  /**\n   * Destroys all Views in this container.\n   */\n  abstract clear(): void;\n\n  /**\n   * Returns the {@link ViewRef} for the View located in this container at the specified index.\n   */\n  abstract get(index: number): ViewRef;\n\n  /**\n   * Returns the number of Views currently attached to this container.\n   */\n  get length(): number { return <number>unimplemented(); };\n\n  /**\n   * Instantiates an Embedded View based on the {@link TemplateRef `templateRef`} and inserts it\n   * into this container at the specified `index`.\n   *\n   * If `index` is not specified, the new View will be inserted as the last View in the container.\n   *\n   * Returns the {@link ViewRef} for the newly created View.\n   */\n  abstract createEmbeddedView(templateRef: TemplateRef, index?: number): EmbeddedViewRef;\n\n  /**\n   * Instantiates a single {@link Component} and inserts its Host View into this container at the\n   * specified `index`.\n   *\n   * The component is instantiated using its {@link ComponentFactory} which can be\n   * obtained via {@link ComponentResolver#resolveComponent}.\n   *\n   * If `index` is not specified, the new View will be inserted as the last View in the container.\n   *\n   * You can optionally specify the {@link Injector} that will be used as parent for the Component.\n   *\n   * Returns the {@link ComponentRef} of the Host View created for the newly instantiated Component.\n   */\n  abstract createComponent(componentFactory: ComponentFactory, index?: number, injector?: Injector,\n                           projectableNodes?: any[][]): ComponentRef;\n\n  /**\n   * Inserts a View identified by a {@link ViewRef} into the container at the specified `index`.\n   *\n   * If `index` is not specified, the new View will be inserted as the last View in the container.\n   *\n   * Returns the inserted {@link ViewRef}.\n   */\n  abstract insert(viewRef: ViewRef, index?: number): ViewRef;\n\n  /**\n   * Returns the index of the View, specified via {@link ViewRef}, within the current container or\n   * `-1` if this container doesn't contain the View.\n   */\n  abstract indexOf(viewRef: ViewRef): number;\n\n  /**\n   * Destroys a View attached to this container at the specified `index`.\n   *\n   * If `index` is not specified, the last View in the container will be removed.\n   */\n  abstract remove(index?: number): void;\n\n  /**\n   * Use along with {@link #insert} to move a View within the current container.\n   *\n   * If the `index` param is omitted, the last {@link ViewRef} is detached.\n   */\n  abstract detach(index?: number): ViewRef;\n}\n\nexport class ViewContainerRef_ implements ViewContainerRef {\n  constructor(private _element: AppElement) {}\n\n  get(index: number): EmbeddedViewRef { return this._element.nestedViews[index].ref; }\n  get length(): number {\n    var views = this._element.nestedViews;\n    return isPresent(views) ? views.length : 0;\n  }\n\n  get element(): ElementRef { return this._element.elementRef; }\n\n  get injector(): Injector { return this._element.injector; }\n\n  get parentInjector(): Injector { return this._element.parentInjector; }\n\n  // TODO(rado): profile and decide whether bounds checks should be added\n  // to the methods below.\n  createEmbeddedView(templateRef: TemplateRef, index: number = -1): EmbeddedViewRef {\n    var viewRef: EmbeddedViewRef = templateRef.createEmbeddedView();\n    this.insert(viewRef, index);\n    return viewRef;\n  }\n\n  /** @internal */\n  _createComponentInContainerScope: WtfScopeFn =\n      wtfCreateScope('ViewContainerRef#createComponent()');\n\n  createComponent(componentFactory: ComponentFactory, index: number = -1, injector: Injector = null,\n                  projectableNodes: any[][] = null): ComponentRef {\n    var s = this._createComponentInContainerScope();\n    var contextInjector = isPresent(injector) ? injector : this._element.parentInjector;\n    var componentRef = componentFactory.create(contextInjector, projectableNodes);\n    this.insert(componentRef.hostView, index);\n    return wtfLeave(s, componentRef);\n  }\n\n  /** @internal */\n  _insertScope = wtfCreateScope('ViewContainerRef#insert()');\n\n  // TODO(i): refactor insert+remove into move\n  insert(viewRef: ViewRef, index: number = -1): ViewRef {\n    var s = this._insertScope();\n    if (index == -1) index = this.length;\n    var viewRef_ = <ViewRef_>viewRef;\n    this._element.attachView(viewRef_.internalView, index);\n    return wtfLeave(s, viewRef_);\n  }\n\n  indexOf(viewRef: ViewRef): number {\n    return ListWrapper.indexOf(this._element.nestedViews, (<ViewRef_>viewRef).internalView);\n  }\n\n  /** @internal */\n  _removeScope = wtfCreateScope('ViewContainerRef#remove()');\n\n  // TODO(i): rename to destroy\n  remove(index: number = -1): void {\n    var s = this._removeScope();\n    if (index == -1) index = this.length - 1;\n    var view = this._element.detachView(index);\n    view.destroy();\n    // view is intentionally not returned to the client.\n    wtfLeave(s);\n  }\n\n  /** @internal */\n  _detachScope = wtfCreateScope('ViewContainerRef#detach()');\n\n  // TODO(i): refactor insert+remove into move\n  detach(index: number = -1): ViewRef {\n    var s = this._detachScope();\n    if (index == -1) index = this.length - 1;\n    var view = this._element.detachView(index);\n    return wtfLeave(s, view.ref);\n  }\n\n  clear() {\n    for (var i = this.length - 1; i >= 0; i--) {\n      this.remove(i);\n    }\n  }\n}\n"]}