refactor(view_manager): split inPlace views into root and free host views.

BREAKING CHANGE:
`AppViewManager.createInPlaceHostView` is replaced by
`AppViewManager.createRootHostView` (for bootstrap) and
`AppViewManager.createFreeHostView` (for imperative components).

The later creates new host elements that are not attached anywhere.
To attach them, use `DomRenderer.getHostElement(hostviewRef)`
to get the host element.

Closes #1920

Author: tbosch

Diff for: modules/angular2/src/core/application.js

@@ -54,21 +54,18 @@ function _injectorBindings(appComponentType): List<Binding> {
   return [
       bind(DOCUMENT_TOKEN).toValue(DOM.defaultDoc()),
       bind(appComponentRefToken).toAsyncFactory((dynamicComponentLoader, injector,
-        metadataReader, testability, registry) => {
+        testability, registry) => {
 
-        var annotation = metadataReader.resolve(appComponentType);
-
-        var selector = annotation.selector;
         // TODO(rado): investigate whether to support bindings on root component.
-        return dynamicComponentLoader.loadIntoNewLocation(appComponentType, null, selector, injector).then( (componentRef) => {
+        return dynamicComponentLoader.loadAsRoot(appComponentType, null, injector).then( (componentRef) => {
           var domView = resolveInternalDomView(componentRef.hostView.render);
           // We need to do this here to ensure that we create Testability and
           // it's ready on the window for users.
           registry.registerApplication(domView.boundElements[0], testability);
 
           return componentRef;
         });
-      }, [DynamicComponentLoader, Injector, DirectiveResolver,
+      }, [DynamicComponentLoader, Injector,
         Testability, TestabilityRegistry]),
 
       bind(appComponentType).toFactory((ref) => ref.instance,

Diff for: modules/angular2/src/core/compiler/dynamic_component_loader.js

@@ -62,19 +62,38 @@ export class DynamicComponentLoader {
   }
 
   /**
-   * Loads a component in the element specified by elementSelector. The loaded component receives
-   * injection normally as a hosted view.
+   * Loads a root component that is placed at the first element that matches the
+   * component's selector.
+   * The loaded component receives injection normally as a hosted view.
+   */
+  loadAsRoot(typeOrBinding, overrideSelector = null, injector:Injector = null):Promise<ComponentRef> {
+    return  this._compiler.compileInHost(this._getBinding(typeOrBinding)).then(hostProtoViewRef => {
+      var hostViewRef = this._viewManager.createRootHostView(hostProtoViewRef, overrideSelector, injector);
+      var newLocation = new ElementRef(hostViewRef, 0);
+      var component = this._viewManager.getComponent(newLocation);
+
+      var dispose = () => {
+        this._viewManager.destroyRootHostView(hostViewRef);
+      };
+      return new ComponentRef(newLocation, component, dispose);
+    });
+  }
+
+  /**
+   * Loads a component into a free host view that is not yet attached to
+   * a parent on the render side, although it is attached to a parent in the injector hierarchy.
+   * The loaded component receives injection normally as a hosted view.
    */
-  loadIntoNewLocation(typeOrBinding, parentComponentLocation:ElementRef, elementSelector:string,
+  loadIntoNewLocation(typeOrBinding, parentComponentLocation:ElementRef,
                       injector:Injector = null):Promise<ComponentRef> {
     return  this._compiler.compileInHost(this._getBinding(typeOrBinding)).then(hostProtoViewRef => {
-      var hostViewRef = this._viewManager.createInPlaceHostView(
-        parentComponentLocation, elementSelector, hostProtoViewRef, injector);
+      var hostViewRef = this._viewManager.createFreeHostView(
+        parentComponentLocation, hostProtoViewRef, injector);
       var newLocation = new ElementRef(hostViewRef, 0);
       var component = this._viewManager.getComponent(newLocation);
 
       var dispose = () => {
-        this._viewManager.destroyInPlaceHostView(parentComponentLocation, hostViewRef);
+        this._viewManager.destroyFreeHostView(parentComponentLocation, hostViewRef);
       };
       return new ComponentRef(newLocation, component, dispose);
     });

Diff for: modules/angular2/src/core/compiler/view.js

@@ -32,7 +32,7 @@ export class AppView {
   componentChildViews: List<AppView>;
   /// Host views that were added by an imperative view.
   /// This is a dynamically growing / shrinking array.
-  inPlaceHostViews: List<AppView>;
+  freeHostViews: List<AppView>;
   viewContainers: List<AppViewContainer>;
   preBuiltObjects: List<PreBuiltObjects>;
   proto: AppProtoView;
@@ -64,7 +64,7 @@ export class AppView {
     this.context = null;
     this.locals = new Locals(null, MapWrapper.clone(protoLocals)); //TODO optimize this
     this.renderer = renderer;
-    this.inPlaceHostViews = [];
+    this.freeHostViews = [];
   }
 
   init(changeDetector:ChangeDetector, elementInjectors:List, rootElementInjectors:List,

Diff for: modules/angular2/src/core/compiler/view_manager.js

@@ -62,33 +62,46 @@ export class AppViewManager {
     return new ViewRef(componentView);
   }
 
-  createInPlaceHostView(parentComponentLocation:ElementRef,
-      hostElementSelector:string, hostProtoViewRef:ProtoViewRef, injector:Injector):ViewRef {
+  createRootHostView(hostProtoViewRef:ProtoViewRef, overrideSelector:string, injector:Injector):ViewRef {
     var hostProtoView = internalProtoView(hostProtoViewRef);
-    var parentComponentHostView = null;
-    var parentComponentBoundElementIndex = null;
-    var parentRenderViewRef = null;
-    if (isPresent(parentComponentLocation)) {
-      parentComponentHostView = internalView(parentComponentLocation.parentView);
-      parentComponentBoundElementIndex = parentComponentLocation.boundElementIndex;
-      parentRenderViewRef = parentComponentHostView.componentChildViews[parentComponentBoundElementIndex].render;
+    var hostElementSelector = overrideSelector;
+    if (isBlank(hostElementSelector)) {
+      hostElementSelector = hostProtoView.elementBinders[0].componentDirective.metadata.selector;
     }
-    var hostRenderView = this._renderer.createInPlaceHostView(parentRenderViewRef, hostElementSelector, hostProtoView.render);
-    var hostView = this._utils.createView(hostProtoView, hostRenderView, this, this._renderer);
+    var renderView = this._renderer.createRootHostView(hostProtoView.render, hostElementSelector);
+    var hostView = this._utils.createView(hostProtoView, renderView, this, this._renderer);
     this._renderer.setEventDispatcher(hostView.render, hostView);
-    this._createViewRecurse(hostView)
-    this._utils.attachAndHydrateInPlaceHostView(parentComponentHostView, parentComponentBoundElementIndex, hostView, injector);
+    this._createViewRecurse(hostView);
+
+    this._utils.hydrateRootHostView(hostView, injector);
     this._viewHydrateRecurse(hostView);
     return new ViewRef(hostView);
   }
 
-  destroyInPlaceHostView(parentComponentLocation:ElementRef, hostViewRef:ViewRef) {
+  destroyRootHostView(hostViewRef:ViewRef) {
+    // Note: Don't detach the hostView as we want to leave the
+    // root element in place. Also don't put the hostView into the view pool
+    // as it is depending on the element for which it was created.
     var hostView = internalView(hostViewRef);
-    var parentView = null;
-    if (isPresent(parentComponentLocation)) {
-      parentView = internalView(parentComponentLocation.parentView).componentChildViews[parentComponentLocation.boundElementIndex];
-    }
-    this._destroyInPlaceHostView(parentView, hostView);
+    // We do want to destroy the component view though.
+    this._viewDehydrateRecurse(hostView, true);
+    this._renderer.destroyView(hostView.render);
+  }
+
+  createFreeHostView(parentComponentLocation:ElementRef, hostProtoViewRef:ProtoViewRef, injector:Injector):ViewRef {
+    var hostProtoView = internalProtoView(hostProtoViewRef);
+    var hostView = this._createPooledView(hostProtoView);
+    var parentComponentHostView = internalView(parentComponentLocation.parentView);
+    var parentComponentBoundElementIndex = parentComponentLocation.boundElementIndex;
+    this._utils.attachAndHydrateFreeHostView(parentComponentHostView, parentComponentBoundElementIndex, hostView, injector);
+    this._viewHydrateRecurse(hostView);
+    return new ViewRef(hostView);
+  }
+
+  destroyFreeHostView(parentComponentLocation:ElementRef, hostViewRef:ViewRef) {
+    var hostView = internalView(hostViewRef);
+    var parentView = internalView(parentComponentLocation.parentView).componentChildViews[parentComponentLocation.boundElementIndex];
+    this._destroyFreeHostView(parentView, hostView);
   }
 
   createViewInContainer(viewContainerLocation:ElementRef,
@@ -186,16 +199,11 @@ export class AppViewManager {
     this._destroyPooledView(componentView);
   }
 
-  _destroyInPlaceHostView(parentView, hostView) {
-    var parentRenderViewRef = null;
-    if (isPresent(parentView)) {
-      parentRenderViewRef = parentView.render;
-    }
+  _destroyFreeHostView(parentView, hostView) {
     this._viewDehydrateRecurse(hostView, true);
-    this._utils.detachInPlaceHostView(parentView, hostView);
-    this._renderer.destroyInPlaceHostView(parentRenderViewRef, hostView.render);
-    // Note: Don't put the inplace host view into the view pool
-    // as it is depending on the element for which it was created.
+    this._renderer.detachFreeHostView(parentView.render, hostView.render);
+    this._utils.detachFreeHostView(parentView, hostView);
+    this._destroyPooledView(hostView);
   }
 
   _viewHydrateRecurse(
@@ -234,10 +242,10 @@ export class AppViewManager {
       }
     }
 
-    // inPlaceHostViews
-    for (var i = view.inPlaceHostViews.length-1; i>=0; i--) {
-      var hostView = view.inPlaceHostViews[i];
-      this._destroyInPlaceHostView(view, hostView);
+    // freeHostViews
+    for (var i = view.freeHostViews.length-1; i>=0; i--) {
+      var hostView = view.freeHostViews[i];
+      this._destroyFreeHostView(view, hostView);
     }
   }
 }

Diff for: modules/angular2/src/core/compiler/view_manager_utils.js

@@ -93,24 +93,23 @@ export class AppViewManagerUtils {
     );
   }
 
-  attachAndHydrateInPlaceHostView(parentComponentHostView:viewModule.AppView, parentComponentBoundElementIndex:number,
+  hydrateRootHostView(hostView:viewModule.AppView, injector:Injector = null) {
+    this._hydrateView(hostView, injector, null, new Object(), null);
+  }
+
+  attachAndHydrateFreeHostView(parentComponentHostView:viewModule.AppView, parentComponentBoundElementIndex:number,
       hostView:viewModule.AppView, injector:Injector = null) {
-    var hostElementInjector = null;
-    if (isPresent(parentComponentHostView)) {
-      hostElementInjector = parentComponentHostView.elementInjectors[parentComponentBoundElementIndex];
-      var parentView = parentComponentHostView.componentChildViews[parentComponentBoundElementIndex];
-      parentView.changeDetector.addChild(hostView.changeDetector);
-      ListWrapper.push(parentView.inPlaceHostViews, hostView);
-    }
+    var hostElementInjector = parentComponentHostView.elementInjectors[parentComponentBoundElementIndex];
+    var parentView = parentComponentHostView.componentChildViews[parentComponentBoundElementIndex];
+    parentView.changeDetector.addChild(hostView.changeDetector);
+    ListWrapper.push(parentView.freeHostViews, hostView);
     this._hydrateView(hostView, injector, hostElementInjector, new Object(), null);
   }
 
-  detachInPlaceHostView(parentView:viewModule.AppView,
+  detachFreeHostView(parentView:viewModule.AppView,
       hostView:viewModule.AppView) {
-    if (isPresent(parentView)) {
-      parentView.changeDetector.removeChild(hostView.changeDetector);
-      ListWrapper.remove(parentView.inPlaceHostViews, hostView);
-    }
+    parentView.changeDetector.removeChild(hostView.changeDetector);
+    ListWrapper.remove(parentView.freeHostViews, hostView);
   }
 
   attachViewInContainer(parentView:viewModule.AppView, boundElementIndex:number,

Diff for: modules/angular2/src/render/api.js

@@ -187,20 +187,19 @@ export class RenderCompiler {
 
 export class Renderer {
   /**
-   * Creates a host view that includes the given element.
-   * @param {RenderViewRef} parentHostViewRef (might be null)
-   * @param {any} hostElementSelector css selector for the host element
+   * Creates a root host view that includes the given element.
    * @param {RenderProtoViewRef} hostProtoViewRef a RenderProtoViewRef of type ProtoViewDto.HOST_VIEW_TYPE
+   * @param {any} hostElementSelector css selector for the host element (will be queried against the main document)
    * @return {RenderViewRef} the created view
    */
-  createInPlaceHostView(parentHostViewRef:RenderViewRef, hostElementSelector:string, hostProtoViewRef:RenderProtoViewRef):RenderViewRef {
+  createRootHostView(hostProtoViewRef:RenderProtoViewRef, hostElementSelector:string):RenderViewRef {
     return null;
   }
 
   /**
-   * Destroys the given host view in the given parent view.
+   * Detaches a free host view's element from the DOM.
    */
-  destroyInPlaceHostView(parentHostViewRef:RenderViewRef, hostViewRef:RenderViewRef) {
+  detachFreeHostView(parentHostViewRef:RenderViewRef, hostViewRef:RenderViewRef) {
   }
 
   /**

Diff for: modules/angular2/src/render/dom/dom_renderer.js

@@ -19,8 +19,6 @@ import {Renderer, RenderProtoViewRef, RenderViewRef} from '../api';
 // const expressions!
 export const DOCUMENT_TOKEN = 'DocumentToken';
 
-var _DOCUMENT_SELECTOR_REGEX = RegExpWrapper.create('\\:document(.+)');
-
 @Injectable()
 export class DomRenderer extends Renderer {
   _eventManager:EventManager;
@@ -34,27 +32,16 @@ export class DomRenderer extends Renderer {
     this._document = document;
   }
 
-  createInPlaceHostView(parentHostViewRef:RenderViewRef, hostElementSelector:string, hostProtoViewRef:RenderProtoViewRef):RenderViewRef {
-    var containerNode;
-    var documentSelectorMatch = RegExpWrapper.firstMatch(_DOCUMENT_SELECTOR_REGEX, hostElementSelector);
-    if (isPresent(documentSelectorMatch)) {
-      containerNode = this._document;
-      hostElementSelector = documentSelectorMatch[1];
-    } else if (isPresent(parentHostViewRef)) {
-      var parentHostView = resolveInternalDomView(parentHostViewRef);
-      containerNode = parentHostView.shadowRoot;
-    } else {
-      containerNode = this._document;
-    }
-    var element = DOM.querySelector(containerNode, hostElementSelector);
+  createRootHostView(hostProtoViewRef:RenderProtoViewRef, hostElementSelector:string):RenderViewRef {
+    var hostProtoView = resolveInternalDomProtoView(hostProtoViewRef);
+    var element = DOM.querySelector(this._document, hostElementSelector);
     if (isBlank(element)) {
       throw new BaseException(`The selector "${hostElementSelector}" did not match any elements`);
     }
-    var hostProtoView = resolveInternalDomProtoView(hostProtoViewRef);
     return new DomViewRef(this._createView(hostProtoView, element));
   }
 
-  destroyInPlaceHostView(parentHostViewRef:RenderViewRef, hostViewRef:RenderViewRef) {
+  detachFreeHostView(parentHostViewRef:RenderViewRef, hostViewRef:RenderViewRef) {
     var hostView = resolveInternalDomView(hostViewRef);
     this._removeViewNodes(hostView);
   }
@@ -89,6 +76,11 @@ export class DomRenderer extends Renderer {
     this._moveViewNodesIntoParent(componentView.shadowRoot, componentView);
   }
 
+  getHostElement(hostViewRef:RenderViewRef) {
+    var hostView = resolveInternalDomView(hostViewRef);
+    return hostView.boundElements[0];
+  }
+
   detachComponentView(hostViewRef:RenderViewRef, boundElementIndex:number, componentViewRef:RenderViewRef) {
     var hostView = resolveInternalDomView(hostViewRef);
     var componentView = resolveInternalDomView(componentViewRef);

Diff for: modules/angular2/src/test_lib/test_bed.js

@@ -94,7 +94,7 @@ export class TestBed {
     DOM.appendChild(doc.body, rootEl);
 
     var componentBinding = bind(component).toValue(context);
-    return this._injector.get(DynamicComponentLoader).loadIntoNewLocation(componentBinding, null, '#root', this._injector).then((hostComponentRef) => {
+    return this._injector.get(DynamicComponentLoader).loadAsRoot(componentBinding,'#root', this._injector).then((hostComponentRef) => {
       return new ViewProxy(hostComponentRef);
     });
   }

Diff for: modules/angular2/test/core/compiler/dynamic_component_loader_spec.js

@@ -11,17 +11,18 @@ import {
   inject,
   beforeEachBindings,
   it,
-  xit
+  xit,
+  viewRootNodes
   } from 'angular2/test_lib';
 
-import {TestBed} from 'angular2/src/test_lib/test_bed';
-
+import {TestBed, ViewProxy} from 'angular2/src/test_lib/test_bed';
+import {Injector} from 'angular2/di';
 import {Component} from 'angular2/src/core/annotations_impl/annotations';
 import {View} from 'angular2/src/core/annotations_impl/view';
 import {DynamicComponentLoader} from 'angular2/src/core/compiler/dynamic_component_loader';
 import {ElementRef} from 'angular2/src/core/compiler/element_ref';
 import {NgIf} from 'angular2/src/directives/ng_if';
-import {DomRenderer} from 'angular2/src/render/dom/dom_renderer';
+import {DomRenderer, DOCUMENT_TOKEN} from 'angular2/src/render/dom/dom_renderer';
 import {DOM} from 'angular2/src/dom/dom_adapter';
 import {AppViewManager} from 'angular2/src/core/compiler/view_manager';
 
@@ -193,14 +194,44 @@ export function main() {
 
     });
 
+    describe('loadAsRoot', () => {
+
+      it('should allow to create, update and destroy components',
+          inject([TestBed, AsyncTestCompleter, DynamicComponentLoader, DOCUMENT_TOKEN, Injector], (tb, async, dcl, doc, injector) => {
+        var rootEl = el('<child-cmp></child-cmp>');
+        DOM.appendChild(doc.body, rootEl);
+        dcl.loadAsRoot(ChildComp, null, injector).then( (componentRef) => {
+          var view = new ViewProxy(componentRef);
+          expect(rootEl.parentNode).toBe(doc.body);
+
+          view.detectChanges();
+
+          expect(rootEl).toHaveText('hello');
+
+          componentRef.instance.ctxProp = 'new';
+
+          view.detectChanges();
+
+          expect(rootEl).toHaveText('new');
+
+          componentRef.dispose();
+
+          expect(rootEl).toHaveText('');
+          expect(rootEl.parentNode).toBe(doc.body);
+
+          async.done();
+        });
+      }));
+
+    });
+
   });
 }
 
 @Component({
   selector: 'imp-ng-cmp'
 })
 @View({
-  renderer: 'imp-ng-cmp-renderer',
   template: ''
 })
 class ImperativeViewComponentUsingNgComponent {
@@ -210,7 +241,11 @@ class ImperativeViewComponentUsingNgComponent {
     var div = el('<div id="impHost"></div>');
     var shadowViewRef = viewManager.getComponentView(self);
     renderer.setComponentViewRootNodes(shadowViewRef.render, [div]);
-    this.done = dynamicComponentLoader.loadIntoNewLocation(ChildComp, self, '#impHost', null);
+    this.done = dynamicComponentLoader.loadIntoNewLocation(ChildComp, self, null).then( (componentRef) => {
+      var element = renderer.getHostElement(componentRef.hostView.render);
+      DOM.appendChild(div, element);
+      return componentRef;
+    });
   }
 }