/
query.ts
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/
query.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {ElementRef} from '../linker/element_ref';
import {QueryList} from '../linker/query_list';
import {NodeDef, NodeFlags, QueryBindingDef, QueryBindingType, QueryDef, QueryValueType, ViewData, asElementData, asProviderData, asQueryList} from './types';
import {declaredViewContainer, filterQueryId, isEmbeddedView} from './util';
export function queryDef(
flags: NodeFlags, id: number, bindings: {[propName: string]: QueryBindingType}): NodeDef {
let bindingDefs: QueryBindingDef[] = [];
for (let propName in bindings) {
const bindingType = bindings[propName];
bindingDefs.push({propName, bindingType});
}
return {
// will bet set by the view definition
index: -1,
parent: null,
renderParent: null,
bindingIndex: -1,
outputIndex: -1,
// regular values
flags,
childFlags: 0,
directChildFlags: 0,
childMatchedQueries: 0,
ngContentIndex: -1,
matchedQueries: {},
matchedQueryIds: 0,
references: {},
childCount: 0,
bindings: [],
bindingFlags: 0,
outputs: [],
element: null,
provider: null,
text: null,
query: {id, filterId: filterQueryId(id), bindings: bindingDefs},
ngContent: null
};
}
export function createQuery(): QueryList<any> {
return new QueryList();
}
export function dirtyParentQueries(view: ViewData) {
const queryIds = view.def.nodeMatchedQueries;
while (view.parent && isEmbeddedView(view)) {
let tplDef = view.parentNodeDef !;
view = view.parent;
// content queries
const end = tplDef.index + tplDef.childCount;
for (let i = 0; i <= end; i++) {
const nodeDef = view.def.nodes[i];
if ((nodeDef.flags & NodeFlags.TypeContentQuery) &&
(nodeDef.flags & NodeFlags.DynamicQuery) &&
(nodeDef.query !.filterId & queryIds) === nodeDef.query !.filterId) {
asQueryList(view, i).setDirty();
}
if ((nodeDef.flags & NodeFlags.TypeElement && i + nodeDef.childCount < tplDef.index) ||
!(nodeDef.childFlags & NodeFlags.TypeContentQuery) ||
!(nodeDef.childFlags & NodeFlags.DynamicQuery)) {
// skip elements that don't contain the template element or no query.
i += nodeDef.childCount;
}
}
}
// view queries
if (view.def.nodeFlags & NodeFlags.TypeViewQuery) {
for (let i = 0; i < view.def.nodes.length; i++) {
const nodeDef = view.def.nodes[i];
if ((nodeDef.flags & NodeFlags.TypeViewQuery) && (nodeDef.flags & NodeFlags.DynamicQuery)) {
asQueryList(view, i).setDirty();
}
// only visit the root nodes
i += nodeDef.childCount;
}
}
}
export function checkAndUpdateQuery(view: ViewData, nodeDef: NodeDef) {
const queryList = asQueryList(view, nodeDef.index);
if (!queryList.dirty) {
return;
}
let directiveInstance: any;
let newValues: any[] = undefined !;
if (nodeDef.flags & NodeFlags.TypeContentQuery) {
const elementDef = nodeDef.parent !.parent !;
newValues = calcQueryValues(
view, elementDef.index, elementDef.index + elementDef.childCount, nodeDef.query !, []);
directiveInstance = asProviderData(view, nodeDef.parent !.index).instance;
} else if (nodeDef.flags & NodeFlags.TypeViewQuery) {
newValues = calcQueryValues(view, 0, view.def.nodes.length - 1, nodeDef.query !, []);
directiveInstance = view.component;
}
queryList.reset(newValues);
const bindings = nodeDef.query !.bindings;
let notify = false;
for (let i = 0; i < bindings.length; i++) {
const binding = bindings[i];
let boundValue: any;
switch (binding.bindingType) {
case QueryBindingType.First:
boundValue = queryList.first;
break;
case QueryBindingType.All:
boundValue = queryList;
notify = true;
break;
}
directiveInstance[binding.propName] = boundValue;
}
if (notify) {
queryList.notifyOnChanges();
}
}
function calcQueryValues(
view: ViewData, startIndex: number, endIndex: number, queryDef: QueryDef,
values: any[]): any[] {
for (let i = startIndex; i <= endIndex; i++) {
const nodeDef = view.def.nodes[i];
const valueType = nodeDef.matchedQueries[queryDef.id];
if (valueType != null) {
values.push(getQueryValue(view, nodeDef, valueType));
}
if (nodeDef.flags & NodeFlags.TypeElement && nodeDef.element !.template &&
(nodeDef.element !.template !.nodeMatchedQueries & queryDef.filterId) ===
queryDef.filterId) {
// check embedded views that were attached at the place of their template.
const elementData = asElementData(view, i);
if (nodeDef.flags & NodeFlags.EmbeddedViews) {
const embeddedViews = elementData.viewContainer !._embeddedViews;
for (let k = 0; k < embeddedViews.length; k++) {
const embeddedView = embeddedViews[k];
const dvc = declaredViewContainer(embeddedView);
if (dvc && dvc === elementData) {
calcQueryValues(embeddedView, 0, embeddedView.def.nodes.length - 1, queryDef, values);
}
}
}
const projectedViews = elementData.template._projectedViews;
if (projectedViews) {
for (let k = 0; k < projectedViews.length; k++) {
const projectedView = projectedViews[k];
calcQueryValues(projectedView, 0, projectedView.def.nodes.length - 1, queryDef, values);
}
}
}
if ((nodeDef.childMatchedQueries & queryDef.filterId) !== queryDef.filterId) {
// if no child matches the query, skip the children.
i += nodeDef.childCount;
}
}
return values;
}
export function getQueryValue(
view: ViewData, nodeDef: NodeDef, queryValueType: QueryValueType): any {
if (queryValueType != null) {
// a match
let value: any;
switch (queryValueType) {
case QueryValueType.RenderElement:
value = asElementData(view, nodeDef.index).renderElement;
break;
case QueryValueType.ElementRef:
value = new ElementRef(asElementData(view, nodeDef.index).renderElement);
break;
case QueryValueType.TemplateRef:
value = asElementData(view, nodeDef.index).template;
break;
case QueryValueType.ViewContainerRef:
value = asElementData(view, nodeDef.index).viewContainer;
break;
case QueryValueType.Provider:
value = asProviderData(view, nodeDef.index).instance;
break;
}
return value;
}
}