angular2/src/core/compiler/view_factory.map

Angular 2 - a web framework for modern web apps

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{Injectable, Inject, OpaqueToken} from 'angular2/di';\nimport {ListWrapper, MapWrapper, Map, StringMapWrapper, List} from 'angular2/src/facade/collection';\nimport * as eli from './element_injector';\nimport {isPresent, isBlank, BaseException} from 'angular2/src/facade/lang';\nimport {NgElement} from 'angular2/src/core/compiler/ng_element';\nimport * as viewModule from './view';\nimport {Renderer} from 'angular2/src/render/api';\n\n// TODO(tbosch): Make this an OpaqueToken as soon as our transpiler supports this!\nexport const VIEW_POOL_CAPACITY = 'ViewFactory.viewPoolCapacity';\n\n@Injectable()\nexport class ViewFactory {\n  _poolCapacityPerProtoView:number;\n  _pooledViewsPerProtoView:Map<viewModule.AppProtoView, List<viewModule.AppView>>;\n  _renderer:Renderer;\n\n  constructor(@Inject(VIEW_POOL_CAPACITY) poolCapacityPerProtoView, renderer:Renderer) {\n    this._poolCapacityPerProtoView = poolCapacityPerProtoView;\n    this._pooledViewsPerProtoView = MapWrapper.create();\n    this._renderer = renderer;\n  }\n\n  getView(protoView:viewModule.AppProtoView):viewModule.AppView {\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);\n  }\n\n  returnView(view:viewModule.AppView) {\n    if (view.hydrated()) {\n      throw new BaseException('Only dehydrated Views can be put back into the pool!');\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:viewModule.AppProtoView): viewModule.AppView {\n    var view = new viewModule.AppView(this._renderer, this, protoView, protoView.protoLocals);\n    var changeDetector = protoView.protoChangeDetector.instantiate(view, protoView.bindings,\n      protoView.getVariableBindings(), protoView.getdirectiveRecords());\n\n    var binders = protoView.elementBinders;\n    var elementInjectors = ListWrapper.createFixedSize(binders.length);\n    var rootElementInjectors = [];\n    var preBuiltObjects = ListWrapper.createFixedSize(binders.length);\n    var componentChildViews = ListWrapper.createFixedSize(binders.length);\n\n    for (var binderIdx = 0; binderIdx < binders.length; binderIdx++) {\n      var binder = binders[binderIdx];\n      var elementInjector = null;\n\n      // elementInjectors and rootElementInjectors\n      var protoElementInjector = binder.protoElementInjector;\n      if (isPresent(protoElementInjector)) {\n        if (isPresent(protoElementInjector.parent)) {\n          var parentElementInjector = elementInjectors[protoElementInjector.parent.index];\n          elementInjector = protoElementInjector.instantiate(parentElementInjector);\n        } else {\n          elementInjector = protoElementInjector.instantiate(null);\n          ListWrapper.push(rootElementInjectors, elementInjector);\n        }\n      }\n      elementInjectors[binderIdx] = elementInjector;\n\n      // componentChildViews\n      var childChangeDetector = null;\n      if (binder.hasStaticComponent()) {\n        var childView = this._createView(binder.nestedProtoView);\n        childChangeDetector = childView.changeDetector;\n        changeDetector.addShadowDomChild(childChangeDetector);\n\n        componentChildViews[binderIdx] = childView;\n      }\n\n      // preBuiltObjects\n      if (isPresent(elementInjector)) {\n        preBuiltObjects[binderIdx] = new eli.PreBuiltObjects(view, new NgElement(view, binderIdx), childChangeDetector);\n      }\n    }\n\n    view.init(changeDetector, elementInjectors, rootElementInjectors,\n      preBuiltObjects, componentChildViews);\n\n    return view;\n  }\n\n}\n"]}