angular2/src/render/dom/view/view_factory.map

Angular 2 - a web framework for modern web apps

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{OpaqueToken, Inject, Injectable} from 'angular2/di';\nimport {int, isPresent, isBlank, BaseException} from 'angular2/src/facade/lang';\nimport {ListWrapper, MapWrapper, Map, StringMapWrapper, List} from 'angular2/src/facade/collection';\n\nimport {DOM} from 'angular2/src/dom/dom_adapter';\n\nimport {Content} from '../shadow_dom/content_tag';\nimport {ShadowDomStrategy} from '../shadow_dom/shadow_dom_strategy';\nimport {EventManager} from 'angular2/src/render/dom/events/event_manager';\n\nimport * as pvModule from './proto_view';\nimport * as viewModule from './view';\nimport {NG_BINDING_CLASS_SELECTOR, NG_BINDING_CLASS} from '../util';\n\n// TODO(tbosch): Make this an OpaqueToken as soon as our transpiler supports this!\nexport const VIEW_POOL_CAPACITY = 'render.ViewFactory.viewPoolCapacity';\n\n@Injectable()\nexport class ViewFactory {\n  _poolCapacityPerProtoView:number;\n  _pooledViewsPerProtoView:Map<pvModule.RenderProtoView, List<viewModule.RenderView>>;\n  _eventManager:EventManager;\n  _shadowDomStrategy:ShadowDomStrategy;\n\n  constructor(@Inject(VIEW_POOL_CAPACITY) poolCapacityPerProtoView,\n      eventManager:EventManager, shadowDomStrategy:ShadowDomStrategy) {\n    this._poolCapacityPerProtoView = poolCapacityPerProtoView;\n    this._pooledViewsPerProtoView = MapWrapper.create();\n    this._eventManager = eventManager;\n    this._shadowDomStrategy = shadowDomStrategy;\n  }\n\n  createInPlaceHostView(hostElementSelector, hostProtoView:pvModule.RenderProtoView):viewModule.RenderView {\n    return this._createView(hostProtoView, hostElementSelector);\n  }\n\n  getView(protoView:pvModule.RenderProtoView):viewModule.RenderView {\n    var pooledViews = MapWrapper.get(this._pooledViewsPerProtoView, protoView);\n    if (isPresent(pooledViews) && pooledViews.length > 0) {\n      return ListWrapper.removeLast(pooledViews);\n    }\n    return this._createView(protoView, null);\n  }\n\n  returnView(view:viewModule.RenderView) {\n    if (view.hydrated) {\n      throw new BaseException('View is still hydrated');\n    }\n    var protoView = view.proto;\n    var pooledViews = MapWrapper.get(this._pooledViewsPerProtoView, protoView);\n    if (isBlank(pooledViews)) {\n      pooledViews = [];\n      MapWrapper.set(this._pooledViewsPerProtoView, protoView, pooledViews);\n    }\n    if (pooledViews.length < this._poolCapacityPerProtoView) {\n      ListWrapper.push(pooledViews, view);\n    }\n  }\n\n  _createView(protoView:pvModule.RenderProtoView, inplaceElement): viewModule.RenderView {\n    if (isPresent(protoView.imperativeRendererId)) {\n      return new viewModule.RenderView(\n        protoView, [], [], [], []\n      );\n    }\n\n    var rootElementClone = isPresent(inplaceElement) ? inplaceElement : DOM.importIntoDoc(protoView.element);\n    var elementsWithBindingsDynamic;\n    if (protoView.isTemplateElement) {\n      elementsWithBindingsDynamic = DOM.querySelectorAll(DOM.content(rootElementClone), NG_BINDING_CLASS_SELECTOR);\n    } else {\n      elementsWithBindingsDynamic = DOM.getElementsByClassName(rootElementClone, NG_BINDING_CLASS);\n    }\n\n    var elementsWithBindings = ListWrapper.createFixedSize(elementsWithBindingsDynamic.length);\n    for (var binderIdx = 0; binderIdx < elementsWithBindingsDynamic.length; ++binderIdx) {\n      elementsWithBindings[binderIdx] = elementsWithBindingsDynamic[binderIdx];\n    }\n\n    var viewRootNodes;\n    if (protoView.isTemplateElement) {\n      var childNode = DOM.firstChild(DOM.content(rootElementClone));\n      viewRootNodes = []; // TODO(perf): Should be fixed size, since we could pre-compute in in pvModule.RenderProtoView\n      // Note: An explicit loop is the fastest way to convert a DOM array into a JS array!\n      while(childNode != null) {\n        ListWrapper.push(viewRootNodes, childNode);\n        childNode = DOM.nextSibling(childNode);\n      }\n    } else {\n      viewRootNodes = [rootElementClone];\n    }\n    var binders = protoView.elementBinders;\n    var boundTextNodes = [];\n    var boundElements = ListWrapper.createFixedSize(binders.length);\n    var contentTags = ListWrapper.createFixedSize(binders.length);\n\n    for (var binderIdx = 0; binderIdx < binders.length; binderIdx++) {\n      var binder = binders[binderIdx];\n      var element;\n      if (binderIdx === 0 && protoView.rootBindingOffset === 1) {\n        element = rootElementClone;\n      } else {\n        element = elementsWithBindings[binderIdx - protoView.rootBindingOffset];\n      }\n      boundElements[binderIdx] = element;\n\n      // boundTextNodes\n      var childNodes = DOM.childNodes(DOM.templateAwareRoot(element));\n      var textNodeIndices = binder.textNodeIndices;\n      for (var i = 0; i<textNodeIndices.length; i++) {\n        ListWrapper.push(boundTextNodes, childNodes[textNodeIndices[i]]);\n      }\n\n      // contentTags\n      var contentTag = null;\n      if (isPresent(binder.contentTagSelector)) {\n        contentTag = new Content(element, binder.contentTagSelector);\n      }\n      contentTags[binderIdx] = contentTag;\n    }\n\n    var view = new viewModule.RenderView(\n      protoView, viewRootNodes,\n      boundTextNodes, boundElements, contentTags\n    );\n\n    for (var binderIdx = 0; binderIdx < binders.length; binderIdx++) {\n      var binder = binders[binderIdx];\n      var element = boundElements[binderIdx];\n\n      // static child components\n      if (binder.hasStaticComponent()) {\n        var childView = this._createView(binder.nestedProtoView, null);\n        ViewFactory.setComponentView(this._shadowDomStrategy, view, binderIdx, childView);\n      }\n\n      // events\n      if (isPresent(binder.eventLocals) && isPresent(binder.localEvents)) {\n        for (var i = 0; i < binder.localEvents.length; i++) {\n          this._createEventListener(view, element, binderIdx, binder.localEvents[i].name, binder.eventLocals);\n        }\n      }\n    }\n\n    return view;\n  }\n\n  _createEventListener(view, element, elementIndex, eventName, eventLocals) {\n    this._eventManager.addEventListener(element, eventName, (event) => {\n      view.dispatchEvent(elementIndex, eventName, event);\n    });\n  }\n\n  // This method is used by the ViewFactory and the ViewHydrator\n  // TODO(tbosch): change shadow dom emulation so that LightDom\n  // instances don't need to be recreated by instead hydrated/dehydrated\n  static setComponentView(shadowDomStrategy:ShadowDomStrategy, hostView:viewModule.RenderView, elementIndex:number, componentView:viewModule.RenderView) {\n    var element = hostView.boundElements[elementIndex];\n    var lightDom = shadowDomStrategy.constructLightDom(hostView, componentView, element);\n    shadowDomStrategy.attachTemplate(element, componentView);\n    hostView.lightDoms[elementIndex] = lightDom;\n    hostView.componentChildViews[elementIndex] = componentView;\n  }\n}\n"]}