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import {DOM, Element, Node, Text, DocumentFragment, TemplateElement} from 'angular2/src/facade/dom';
import {ListWrapper, MapWrapper, StringMapWrapper, List} from 'angular2/src/facade/collection';
import {AST, ContextWithVariableBindings, ChangeDispatcher, ProtoChangeDetector, ChangeDetector, ChangeRecord}
from 'angular2/change_detection';
import {ProtoElementInjector, ElementInjector, PreBuiltObjects} from './element_injector';
import {BindingPropagationConfig} from './binding_propagation_config';
import {ElementBinder} from './element_binder';
import {DirectiveMetadata} from './directive_metadata';
import {SetterFn} from 'angular2/src/reflection/types';
import {FIELD, IMPLEMENTS, int, isPresent, isBlank, BaseException} from 'angular2/src/facade/lang';
import {Injector} from 'angular2/di';
import {NgElement} from 'angular2/src/core/dom/element';
import {ViewPort} from './viewport';
import {Content} from './shadow_dom_emulation/content_tag';
import {LightDom, DestinationLightDom} from './shadow_dom_emulation/light_dom';
import {ShadowDomStrategy} from './shadow_dom_strategy';
const NG_BINDING_CLASS = 'ng-binding';
const NG_BINDING_CLASS_SELECTOR = '.ng-binding';
// TODO(tbosch): Cannot use `const` because of Dart.
var NO_FORMATTERS = MapWrapper.create();
/**
* Const of making objects: http://jsperf.com/instantiate-size-of-object
*/
@IMPLEMENTS(ChangeDispatcher)
export class View {
/// This list matches the _nodes list. It is sparse, since only Elements have ElementInjector
rootElementInjectors:List<ElementInjector>;
elementInjectors:List<ElementInjector>;
bindElements:List<Element>;
textNodes:List<Text>;
changeDetector:ChangeDetector;
/// When the view is part of render tree, the DocumentFragment is empty, which is why we need
/// to keep track of the nodes.
nodes:List<Node>;
componentChildViews: List<View>;
viewPorts: List<ViewPort>;
preBuiltObjects: List<PreBuiltObjects>;
proto: ProtoView;
context: any;
contextWithLocals:ContextWithVariableBindings;
constructor(proto:ProtoView, nodes:List<Node>, protoChangeDetector:ProtoChangeDetector, protoContextLocals:Map) {
this.proto = proto;
this.nodes = nodes;
this.changeDetector = protoChangeDetector.instantiate(this, NO_FORMATTERS);
this.elementInjectors = null;
this.rootElementInjectors = null;
this.textNodes = null;
this.bindElements = null;
this.componentChildViews = null;
this.viewPorts = null;
this.preBuiltObjects = null;
this.context = null;
this.contextWithLocals = (MapWrapper.size(protoContextLocals) > 0)
? new ContextWithVariableBindings(null, MapWrapper.clone(protoContextLocals))
: null;
}
init(elementInjectors:List, rootElementInjectors:List, textNodes: List, bindElements:List, viewPorts:List, preBuiltObjects:List, componentChildViews:List) {
this.elementInjectors = elementInjectors;
this.rootElementInjectors = rootElementInjectors;
this.textNodes = textNodes;
this.bindElements = bindElements;
this.viewPorts = viewPorts;
this.preBuiltObjects = preBuiltObjects;
this.componentChildViews = componentChildViews;
}
setLocal(contextName: string, value) {
if (!this.hydrated()) throw new BaseException('Cannot set locals on dehydrated view.');
if (!MapWrapper.contains(this.proto.variableBindings, contextName)) {
return;
}
var templateName = MapWrapper.get(this.proto.variableBindings, contextName);
this.context.set(templateName, value);
}
hydrated() {
return isPresent(this.context);
}
_hydrateContext(newContext) {
if (isPresent(this.contextWithLocals)) {
this.contextWithLocals.parent = newContext;
this.context = this.contextWithLocals;
} else {
this.context = newContext;
}
// TODO(tbosch): if we have a contextWithLocals we actually only need to
// set the contextWithLocals once. Would it be faster to always use a contextWithLocals
// even if we don't have locals and not update the recordRange here?
this.changeDetector.setContext(this.context);
}
_dehydrateContext() {
if (isPresent(this.contextWithLocals)) {
this.contextWithLocals.clearValues();
}
this.context = null;
}
/**
* A dehydrated view is a state of the view that allows it to be moved around
* the view tree, without incurring the cost of recreating the underlying
* injectors and watch records.
*
* A dehydrated view has the following properties:
*
* - all element injectors are empty.
* - all appInjectors are released.
* - all viewports are empty.
* - all context locals are set to null.
* - the view context is null.
*
* A call to hydrate/dehydrate does not attach/detach the view from the view
* tree.
*/
hydrate(appInjector: Injector, hostElementInjector: ElementInjector,
context: Object) {
if (this.hydrated()) throw new BaseException('The view is already hydrated.');
this._hydrateContext(context);
// viewPorts
for (var i = 0; i < this.viewPorts.length; i++) {
this.viewPorts[i].hydrate(appInjector, hostElementInjector);
}
var binders = this.proto.elementBinders;
var componentChildViewIndex = 0;
for (var i = 0; i < binders.length; ++i) {
var componentDirective = binders[i].componentDirective;
var shadowDomAppInjector = null;
// shadowDomAppInjector
if (isPresent(componentDirective)) {
var services = componentDirective.annotation.componentServices;
if (isPresent(services))
shadowDomAppInjector = appInjector.createChild(services);
else {
shadowDomAppInjector = appInjector;
}
} else {
shadowDomAppInjector = null;
}
// elementInjectors
var elementInjector = this.elementInjectors[i];
if (isPresent(elementInjector)) {
elementInjector.instantiateDirectives(appInjector, shadowDomAppInjector, this.preBuiltObjects[i]);
// The exporting of $implicit is a special case. Since multiple elements will all export
// the different values as $implicit, directly assign $implicit bindings to the variable
// name.
var exportImplicitName = elementInjector.getExportImplicitName();
if (elementInjector.isExportingComponent()) {
this.context.set(exportImplicitName, elementInjector.getComponent());
} else if (elementInjector.isExportingElement()) {
this.context.set(exportImplicitName, elementInjector.getNgElement().domElement);
}
}
if (isPresent(componentDirective)) {
this.componentChildViews[componentChildViewIndex++].hydrate(shadowDomAppInjector,
elementInjector, elementInjector.getComponent());
}
}
// this should be moved into DOM write queue
for (var i = 0; i < binders.length; ++i) {
var componentDirective = binders[i].componentDirective;
if (isPresent(componentDirective)) {
var lightDom = this.preBuiltObjects[i].lightDom;
if (isPresent(lightDom)) {
lightDom.redistribute();
}
}
}
}
dehydrate() {
// Note: preserve the opposite order of the hydration process.
// componentChildViews
for (var i = 0; i < this.componentChildViews.length; i++) {
this.componentChildViews[i].dehydrate();
}
// elementInjectors
for (var i = 0; i < this.elementInjectors.length; i++) {
if (isPresent(this.elementInjectors[i])) {
this.elementInjectors[i].clearDirectives();
}
}
// viewPorts
if (isPresent(this.viewPorts)) {
for (var i = 0; i < this.viewPorts.length; i++) {
this.viewPorts[i].dehydrate();
}
}
this._dehydrateContext();
}
onRecordChange(directiveMemento, records:List) {
this._invokeMementos(records);
if (directiveMemento instanceof DirectiveMemento) {
this._notifyDirectiveAboutChanges(directiveMemento, records);
}
}
_invokeMementos(records:List) {
for(var i = 0; i < records.length; ++i) {
this._invokeMementoFor(records[i]);
}
}
_notifyDirectiveAboutChanges(directiveMemento, records:List) {
var dir = directiveMemento.directive(this.elementInjectors);
var binding = directiveMemento.directiveBinding(this.elementInjectors);
if (binding.callOnChange) {
dir.onChange(this._collectChanges(records));
}
}
// dispatch to element injector or text nodes based on context
_invokeMementoFor(record:ChangeRecord) {
var memento = record.bindingMemento;
if (memento instanceof DirectiveBindingMemento) {
var directiveMemento:DirectiveBindingMemento = memento;
directiveMemento.invoke(record, this.elementInjectors);
} else if (memento instanceof ElementBindingMemento) {
var elementMemento:ElementBindingMemento = memento;
elementMemento.invoke(record, this.bindElements);
} else {
// we know it refers to _textNodes.
var textNodeIndex:number = memento;
DOM.setText(this.textNodes[textNodeIndex], record.currentValue);
}
}
_collectChanges(records:List) {
var changes = StringMapWrapper.create();
for(var i = 0; i < records.length; ++i) {
var record = records[i];
var propertyUpdate = new PropertyUpdate(record.currentValue, record.previousValue);
StringMapWrapper.set(changes, record.bindingMemento._setterName, propertyUpdate);
}
return changes;
}
}
export class ProtoView {
element:Element;
elementBinders:List<ElementBinder>;
protoChangeDetector:ProtoChangeDetector;
variableBindings: Map;
protoContextLocals:Map;
textNodesWithBindingCount:int;
elementsWithBindingCount:int;
instantiateInPlace:boolean;
rootBindingOffset:int;
isTemplateElement:boolean;
shadowDomStrategy: ShadowDomStrategy;
constructor(
template:Element,
protoChangeDetector:ProtoChangeDetector,
shadowDomStrategy: ShadowDomStrategy) {
this.element = template;
this.elementBinders = [];
this.variableBindings = MapWrapper.create();
this.protoContextLocals = MapWrapper.create();
this.protoChangeDetector = protoChangeDetector;
this.textNodesWithBindingCount = 0;
this.elementsWithBindingCount = 0;
this.instantiateInPlace = false;
this.rootBindingOffset = (isPresent(this.element) && DOM.hasClass(this.element, NG_BINDING_CLASS))
? 1 : 0;
this.isTemplateElement = this.element instanceof TemplateElement;
this.shadowDomStrategy = shadowDomStrategy;
}
// TODO(rado): hostElementInjector should be moved to hydrate phase.
instantiate(hostElementInjector: ElementInjector):View {
var rootElementClone = this.instantiateInPlace ? this.element : DOM.clone(this.element);
var elementsWithBindingsDynamic;
if (this.isTemplateElement) {
elementsWithBindingsDynamic = DOM.querySelectorAll(rootElementClone.content, NG_BINDING_CLASS_SELECTOR);
} else {
elementsWithBindingsDynamic= DOM.getElementsByClassName(rootElementClone, NG_BINDING_CLASS);
}
var elementsWithBindings = ListWrapper.createFixedSize(elementsWithBindingsDynamic.length);
for (var i = 0; i < elementsWithBindingsDynamic.length; ++i) {
elementsWithBindings[i] = elementsWithBindingsDynamic[i];
}
var viewNodes;
if (this.isTemplateElement) {
var childNode = DOM.firstChild(rootElementClone.content);
viewNodes = []; // TODO(perf): Should be fixed size, since we could pre-compute in in ProtoView
// Note: An explicit loop is the fastest way to convert a DOM array into a JS array!
while(childNode != null) {
ListWrapper.push(viewNodes, childNode);
childNode = DOM.nextSibling(childNode);
}
} else {
viewNodes = [rootElementClone];
}
var view = new View(this, viewNodes, this.protoChangeDetector, this.protoContextLocals);
var binders = this.elementBinders;
var elementInjectors = ListWrapper.createFixedSize(binders.length);
var rootElementInjectors = [];
var textNodes = [];
var elementsWithPropertyBindings = [];
var preBuiltObjects = ListWrapper.createFixedSize(binders.length);
var viewPorts = [];
var componentChildViews = [];
for (var i = 0; i < binders.length; i++) {
var binder = binders[i];
var element;
if (i === 0 && this.rootBindingOffset === 1) {
element = rootElementClone;
} else {
element = elementsWithBindings[i - this.rootBindingOffset];
}
var elementInjector = null;
// elementInjectors and rootElementInjectors
var protoElementInjector = binder.protoElementInjector;
if (isPresent(protoElementInjector)) {
if (isPresent(protoElementInjector.parent)) {
var parentElementInjector = elementInjectors[protoElementInjector.parent.index];
elementInjector = protoElementInjector.instantiate(parentElementInjector, null, binder.events);
} else {
elementInjector = protoElementInjector.instantiate(null, hostElementInjector, binder.events);
ListWrapper.push(rootElementInjectors, elementInjector);
}
}
elementInjectors[i] = elementInjector;
if (binder.hasElementPropertyBindings) {
ListWrapper.push(elementsWithPropertyBindings, element);
}
// textNodes
var textNodeIndices = binder.textNodeIndices;
if (isPresent(textNodeIndices)) {
var childNode = DOM.firstChild(DOM.templateAwareRoot(element));
for (var j = 0, k = 0; j < textNodeIndices.length; j++) {
for(var index = textNodeIndices[j]; k < index; k++) {
childNode = DOM.nextSibling(childNode);
}
ListWrapper.push(textNodes, childNode);
}
}
// componentChildViews
var lightDom = null;
var bindingPropagationConfig = null;
if (isPresent(binder.componentDirective)) {
var strategy = this.shadowDomStrategy;
var childView = binder.nestedProtoView.instantiate(elementInjector);
view.changeDetector.addChild(childView.changeDetector);
lightDom = strategy.constructLightDom(view, childView, element);
strategy.attachTemplate(element, childView);
bindingPropagationConfig = new BindingPropagationConfig(view.changeDetector);
ListWrapper.push(componentChildViews, childView);
}
// viewPorts
var viewPort = null;
if (isPresent(binder.templateDirective)) {
var destLightDom = this._parentElementLightDom(protoElementInjector, preBuiltObjects);
viewPort = new ViewPort(view, element, binder.nestedProtoView, elementInjector, destLightDom);
ListWrapper.push(viewPorts, viewPort);
}
// preBuiltObjects
if (isPresent(elementInjector)) {
preBuiltObjects[i] = new PreBuiltObjects(view, new NgElement(element), viewPort,
lightDom, bindingPropagationConfig);
}
// events
if (isPresent(binder.events)) {
MapWrapper.forEach(binder.events, (expr, eventName) => {
if (isBlank(elementInjector) || !elementInjector.hasEventEmitter(eventName)) {
ProtoView._addNativeEventListener(element, eventName, expr, view);
}
});
}
}
view.init(elementInjectors, rootElementInjectors, textNodes, elementsWithPropertyBindings,
viewPorts, preBuiltObjects, componentChildViews);
return view;
}
static _addNativeEventListener(element: Element, eventName: string, expr: AST, view: View) {
var locals = MapWrapper.create();
var innerCallback = ProtoView.buildInnerCallback(expr, view, locals);
DOM.on(element, eventName, (event) => {
if (event.target === element) {
innerCallback(event);
}
});
}
static buildInnerCallback(expr:AST, view:View, locals: Map) {
return (event) => {
// Most of the time the event will be fired only when the view is
// in the live document. However, in a rare circumstance the
// view might get dehydrated, in between the event queuing up and
// firing.
if (view.hydrated()) {
MapWrapper.set(locals, `$event`, event);
var context = new ContextWithVariableBindings(view.context, locals);
expr.eval(context);
}
}
}
_parentElementLightDom(protoElementInjector:ProtoElementInjector, preBuiltObjects:List):LightDom {
var p = protoElementInjector.parent;
return isPresent(p) ? preBuiltObjects[p.index].lightDom : null;
}
bindVariable(contextName:string, templateName:string) {
MapWrapper.set(this.variableBindings, contextName, templateName);
MapWrapper.set(this.protoContextLocals, templateName, null);
}
bindElement(protoElementInjector:ProtoElementInjector,
componentDirective:DirectiveMetadata = null, templateDirective:DirectiveMetadata = null):ElementBinder {
var elBinder = new ElementBinder(protoElementInjector, componentDirective, templateDirective);
ListWrapper.push(this.elementBinders, elBinder);
return elBinder;
}
/**
* Adds a text node binding for the last created ElementBinder via bindElement
*/
bindTextNode(indexInParent:int, expression:AST) {
var elBinder = this.elementBinders[this.elementBinders.length-1];
if (isBlank(elBinder.textNodeIndices)) {
elBinder.textNodeIndices = ListWrapper.create();
}
ListWrapper.push(elBinder.textNodeIndices, indexInParent);
var memento = this.textNodesWithBindingCount++;
this.protoChangeDetector.addAst(expression, memento);
}
/**
* Adds an element property binding for the last created ElementBinder via bindElement
*/
bindElementProperty(expression:AST, setterName:string, setter:SetterFn) {
var elBinder = this.elementBinders[this.elementBinders.length-1];
if (!elBinder.hasElementPropertyBindings) {
elBinder.hasElementPropertyBindings = true;
this.elementsWithBindingCount++;
}
var memento = new ElementBindingMemento(this.elementsWithBindingCount-1, setterName, setter);
this.protoChangeDetector.addAst(expression, memento);
}
/**
* Adds an event binding for the last created ElementBinder via bindElement
*/
bindEvent(eventName:string, expression:AST) {
var elBinder = this.elementBinders[this.elementBinders.length-1];
if (isBlank(elBinder.events)) {
elBinder.events = MapWrapper.create();
}
MapWrapper.set(elBinder.events, eventName, expression);
}
/**
* Adds a directive property binding for the last created ElementBinder via bindElement
*/
bindDirectiveProperty(
directiveIndex:number,
expression:AST,
setterName:string,
setter:SetterFn,
isContentWatch: boolean) {
var bindingMemento = new DirectiveBindingMemento(
this.elementBinders.length-1,
directiveIndex,
setterName,
setter
);
var directiveMemento = DirectiveMemento.get(bindingMemento);
this.protoChangeDetector.addAst(expression, bindingMemento, directiveMemento, isContentWatch);
}
// Create a rootView as if the compiler encountered <rootcmp></rootcmp>,
// and the component template is already compiled into protoView.
// Used for bootstrapping.
static createRootProtoView(protoView: ProtoView,
insertionElement,
rootComponentAnnotatedType: DirectiveMetadata,
protoChangeDetector:ProtoChangeDetector,
shadowDomStrategy: ShadowDomStrategy
): ProtoView {
DOM.addClass(insertionElement, 'ng-binding');
var rootProtoView = new ProtoView(insertionElement, protoChangeDetector, shadowDomStrategy);
rootProtoView.instantiateInPlace = true;
var binder = rootProtoView.bindElement(
new ProtoElementInjector(null, 0, [rootComponentAnnotatedType.type], true));
binder.componentDirective = rootComponentAnnotatedType;
binder.nestedProtoView = protoView;
return rootProtoView;
}
}
export class ElementBindingMemento {
_elementIndex:int;
_setterName:string;
_setter:SetterFn;
constructor(elementIndex:int, setterName:string, setter:SetterFn) {
this._elementIndex = elementIndex;
this._setterName = setterName;
this._setter = setter;
}
invoke(record:ChangeRecord, bindElements:List<Element>) {
var element:Element = bindElements[this._elementIndex];
this._setter(element, record.currentValue);
}
}
export class DirectiveBindingMemento {
_elementInjectorIndex:int;
_directiveIndex:int;
_setterName:string;
_setter:SetterFn;
constructor(
elementInjectorIndex:number,
directiveIndex:number,
setterName:string,
setter:SetterFn) {
this._elementInjectorIndex = elementInjectorIndex;
this._directiveIndex = directiveIndex;
this._setterName = setterName;
this._setter = setter;
}
invoke(record:ChangeRecord, elementInjectors:List<ElementInjector>) {
var elementInjector:ElementInjector = elementInjectors[this._elementInjectorIndex];
var directive = elementInjector.getDirectiveAtIndex(this._directiveIndex);
this._setter(directive, record.currentValue);
}
}
var _directiveMementos = MapWrapper.create();
class DirectiveMemento {
_elementInjectorIndex:number;
_directiveIndex:number;
constructor(elementInjectorIndex:number, directiveIndex:number) {
this._elementInjectorIndex = elementInjectorIndex;
this._directiveIndex = directiveIndex;
}
static get(memento:DirectiveBindingMemento) {
var elementInjectorIndex = memento._elementInjectorIndex;
var directiveIndex = memento._directiveIndex;
var id = elementInjectorIndex * 100 + directiveIndex;
if (!MapWrapper.contains(_directiveMementos, id)) {
MapWrapper.set(_directiveMementos, id, new DirectiveMemento(elementInjectorIndex, directiveIndex));
}
return MapWrapper.get(_directiveMementos, id);
}
directive(elementInjectors:List<ElementInjector>) {
var elementInjector:ElementInjector = elementInjectors[this._elementInjectorIndex];
return elementInjector.getDirectiveAtIndex(this._directiveIndex);
}
directiveBinding(elementInjectors:List<ElementInjector>) {
var elementInjector:ElementInjector = elementInjectors[this._elementInjectorIndex];
return elementInjector.getDirectiveBindingAtIndex(this._directiveIndex);
}
}
class PropertyUpdate {
currentValue;
previousValue;
constructor(currentValue, previousValue) {
this.currentValue = currentValue;
this.previousValue = previousValue;
}
}