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feat(change_detector): notify directives on property changes

This commit is contained in:
vsavkin 2014-12-02 17:09:46 -08:00
parent 5bdefee6c9
commit 847cefcb7b
9 changed files with 320 additions and 62 deletions
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57
modules/change_detection/src/change_detector.js
View File

@ -1,25 +1,70 @@
import {ProtoRecordRange, RecordRange} from './record_range';
import {ProtoRecord, Record} from './record';
import {FIELD, int, isPresent} from 'facade/lang';
import {int, isPresent, isBlank} from 'facade/lang';
import {ListWrapper, List} from 'facade/collection';
export * from './record';
export * from './record_range'
export class ChangeDetector {
_rootRecordRange:RecordRange;
constructor(recordRange:RecordRange) {
this._rootRecordRange = recordRange;
}
detectChanges():int {
var count:int = 0;
for (var record = this._rootRecordRange.findFirstEnabledRecord();
isPresent(record);
record = record.nextEnabled) {
var count = 0;
var updatedRecords = null;
var record = this._rootRecordRange.findFirstEnabledRecord();
while (isPresent(record)) {
var currentRange = record.recordRange;
var currentGroup = record.groupMemento();
var nextEnabled = record.nextEnabled;
var nextRange = isPresent(nextEnabled) ? nextEnabled.recordRange : null;
var nextGroup = isPresent(nextEnabled) ? nextEnabled.groupMemento() : null;
if (record.check()) {
count++;
count ++;
if (record.terminatesExpression()) {
updatedRecords = this._addRecord(updatedRecords, record);
}
}
if (this._shouldNotifyDispatcher(currentRange, nextRange, currentGroup, nextGroup, updatedRecords)) {
currentRange.dispatcher.onRecordChange(currentGroup, updatedRecords);
updatedRecords = null;
}
record = record.nextEnabled;
}
return count;
}
_groupChanged(currentRange, nextRange, currentGroup, nextGroup) {
return currentRange != nextRange || currentGroup != nextGroup;
}
_shouldNotifyDispatcher(currentRange, nextRange, currentGroup, nextGroup, updatedRecords) {
return this._groupChanged(currentRange, nextRange, currentGroup, nextGroup) && isPresent(updatedRecords);
}
_addRecord(updatedRecords:List, record:Record) {
if (isBlank(updatedRecords)) {
updatedRecords = _singleElementList;
updatedRecords[0] = record;
} else if (updatedRecords === _singleElementList) {
updatedRecords = [_singleElementList[0], record];
} else {
ListWrapper.push(updatedRecords, record);
}
return updatedRecords;
}
}
var _singleElementList = [null];

46
modules/change_detection/src/record.js
View File

@ -34,15 +34,19 @@ export class ProtoRecord {
arity:int;
name:string;
dest:any;
groupMemento:any;
next:ProtoRecord;
recordInConstruction:Record;
constructor(recordRange:ProtoRecordRange,
mode:int,
funcOrValue,
arity:int,
name:string,
dest) {
dest,
groupMemento) {
this.recordRange = recordRange;
this._mode = mode;
@ -50,6 +54,7 @@ export class ProtoRecord {
this.arity = arity;
this.name = name;
this.dest = dest;
this.groupMemento = groupMemento;
this.next = null;
// The concrete Record instantiated from this ProtoRecord
@ -190,21 +195,20 @@ export class Record {
check():boolean {
if (this.isCollection) {
var changed = this._checkCollection();
if (changed) {
this._notifyDispatcher();
return true;
}
return false;
return this._checkCollection();
} else {
this.previousValue = this.currentValue;
this.currentValue = this._calculateNewValue();
if (isSame(this.previousValue, this.currentValue)) return false;
this._updateDestination();
return true;
return this._checkSingleRecord();
}
}
_checkSingleRecord():boolean {
this.previousValue = this.currentValue;
this.currentValue = this._calculateNewValue();
if (isSame(this.previousValue, this.currentValue)) return false;
this._updateDestination();
return true;
}
_updateDestination() {
// todo(vicb): compute this info only once in ctor ? (add a bit in mode not to grow the mem req)
if (this.dest instanceof Record) {
@ -213,15 +217,9 @@ export class Record {
} else {
this.dest.updateContext(this.currentValue);
}
} else {
this._notifyDispatcher();
}
}
_notifyDispatcher() {
this.recordRange.dispatcher.onRecordChange(this, this.protoRecord.dest);
}
// return whether the content has changed
_checkCollection():boolean {
switch(this.type) {
@ -307,9 +305,21 @@ export class Record {
}
}
terminatesExpression():boolean {
return !(this.dest instanceof Record);
}
get isMarkerRecord() {
return this.type == RECORD_TYPE_MARKER;
}
expressionMemento() {
return this.protoRecord.dest;
}
groupMemento() {
return isPresent(this.protoRecord) ? this.protoRecord.groupMemento : null;
}
}
function isSame(a, b) {

20
modules/change_detection/src/record_range.js
View File

@ -45,21 +45,24 @@ export class ProtoRecordRange {
* Parses [ast] into [ProtoRecord]s and adds them to [ProtoRecordRange].
*
* @param ast The expression to watch
* @param memento an opaque object which will be passed to WatchGroupDispatcher on
* @param expressionMemento an opaque object which will be passed to WatchGroupDispatcher on
* detecting a change.
* @param content Wether to watch collection content (true) or reference (false, default)
*/
addRecordsFromAST(ast:AST,
memento,
expressionMemento,
groupMemento,
content:boolean = false)
{
if (this.recordCreator === null) {
this.recordCreator = new ProtoRecordCreator(this);
}
if (content) {
ast = new Collection(ast);
}
this.recordCreator.createRecordsFromAST(ast, memento);
this.recordCreator.createRecordsFromAST(ast, expressionMemento, groupMemento);
}
// TODO(rado): the type annotation should be dispatcher:WatchGroupDispatcher.
@ -85,6 +88,8 @@ export class ProtoRecordRange {
for (var proto = this.recordCreator.headRecord; proto != null; proto = proto.next) {
if (proto.dest instanceof Destination) {
proto.recordInConstruction.dest = proto.dest.record.recordInConstruction;
} else {
proto.recordInConstruction.dest = proto.dest;
}
proto.recordInConstruction = null;
}
@ -378,6 +383,8 @@ class ProtoRecordCreator {
protoRecordRange:ProtoRecordRange;
headRecord:ProtoRecord;
tailRecord:ProtoRecord;
groupMemento:any;
constructor(protoRecordRange) {
this.protoRecordRange = protoRecordRange;
this.headRecord = null;
@ -491,12 +498,13 @@ class ProtoRecordCreator {
visitTemplateBindings(ast, dest) {this._unsupported();}
createRecordsFromAST(ast:AST, memento){
ast.visit(this, memento);
createRecordsFromAST(ast:AST, expressionMemento:any, groupMemento:any){
this.groupMemento = groupMemento;
ast.visit(this, expressionMemento);
}
construct(recordType, funcOrValue, arity, name, dest) {
return new ProtoRecord(this.protoRecordRange, recordType, funcOrValue, arity, name, dest);
return new ProtoRecord(this.protoRecordRange, recordType, funcOrValue, arity, name, dest, this.groupMemento);
}
add(protoRecord:ProtoRecord) {

85
modules/change_detection/test/change_detector_spec.js
View File

@ -26,7 +26,7 @@ export function main() {
function createChangeDetector(memo:string, exp:string, context = null, formatters = null,
content = false) {
var prr = new ProtoRecordRange();
prr.addRecordsFromAST(ast(exp), memo, content);
prr.addRecordsFromAST(ast(exp), memo, memo, content);
var dispatcher = new LoggingDispatcher();
var rr = prr.instantiate(dispatcher, formatters);
@ -97,21 +97,21 @@ export function main() {
it("should support literal array", () => {
var c = createChangeDetector('array', '[1,2]');
c["changeDetector"].detectChanges();
expect(c["dispatcher"].loggedValues).toEqual([[1,2]]);
expect(c["dispatcher"].loggedValues).toEqual([[[1,2]]]);
c = createChangeDetector('array', '[1,a]', new TestData(2));
c["changeDetector"].detectChanges();
expect(c["dispatcher"].loggedValues).toEqual([[1,2]]);
expect(c["dispatcher"].loggedValues).toEqual([[[1,2]]]);
});
it("should support literal maps", () => {
var c = createChangeDetector('map', '{z:1}');
c["changeDetector"].detectChanges();
expect(MapWrapper.get(c["dispatcher"].loggedValues[0], 'z')).toEqual(1);
expect(MapWrapper.get(c["dispatcher"].loggedValues[0][0], 'z')).toEqual(1);
c = createChangeDetector('map', '{z:a}', new TestData(1));
c["changeDetector"].detectChanges();
expect(MapWrapper.get(c["dispatcher"].loggedValues[0], 'z')).toEqual(1);
expect(MapWrapper.get(c["dispatcher"].loggedValues[0][0], 'z')).toEqual(1);
});
it("should support binary operations", () => {
@ -242,6 +242,7 @@ export function main() {
context.a = [0];
cd.detectChanges();
expect(dsp.log).toEqual(["a=" +
arrayChangesAsString({
collection: ['0[null->0]'],
@ -343,10 +344,69 @@ export function main() {
});
}
});
describe("onGroupChange", () => {
it("should notify the dispatcher when a group of records changes", () => {
var prr = new ProtoRecordRange();
prr.addRecordsFromAST(ast("1 + 2"), "memo", 1);
prr.addRecordsFromAST(ast("10 + 20"), "memo", 1);
prr.addRecordsFromAST(ast("100 + 200"), "memo2", 2);
var dispatcher = new LoggingDispatcher();
var rr = prr.instantiate(dispatcher, null);
var cd = new ChangeDetector(rr);
cd.detectChanges();
expect(dispatcher.loggedValues).toEqual([[3, 30], [300]]);
});
it("should update every instance of a group individually", () => {
var prr = new ProtoRecordRange();
prr.addRecordsFromAST(ast("1 + 2"), "memo", "memo");
var dispatcher = new LoggingDispatcher();
var rr = new RecordRange(null, dispatcher);
rr.addRange(prr.instantiate(dispatcher, null));
rr.addRange(prr.instantiate(dispatcher, null));
var cd = new ChangeDetector(rr);
cd.detectChanges();
expect(dispatcher.loggedValues).toEqual([[3], [3]]);
});
it("should notify the dispatcher before switching to the next group", () => {
var prr = new ProtoRecordRange();
prr.addRecordsFromAST(ast("a()"), "a", 1);
prr.addRecordsFromAST(ast("b()"), "b", 2);
prr.addRecordsFromAST(ast("c()"), "b", 2);
var dispatcher = new LoggingDispatcher();
var rr = prr.instantiate(dispatcher, null);
var tr = new TestRecord();
tr.a = () => {dispatcher.logValue('InvokeA'); return 'a'};
tr.b = () => {dispatcher.logValue('InvokeB'); return 'b'};
tr.c = () => {dispatcher.logValue('InvokeC'); return 'c'};
rr.setContext(tr);
var cd = new ChangeDetector(rr);
cd.detectChanges();
expect(dispatcher.loggedValues).toEqual(['InvokeA', ['a'], 'InvokeB', 'InvokeC', ['b', 'c']]);
});
});
});
});
}
class TestRecord {
a;
b;
c;
}
class Person {
name:string;
address:Address;
@ -387,6 +447,7 @@ class TestData {
class LoggingDispatcher extends WatchGroupDispatcher {
log:List;
loggedValues:List;
constructor() {
this.log = null;
this.loggedValues = null;
@ -397,10 +458,18 @@ class LoggingDispatcher extends WatchGroupDispatcher {
this.log = ListWrapper.create();
this.loggedValues = ListWrapper.create();
}
logValue(value) {
ListWrapper.push(this.loggedValues, value);
}
onRecordChange(record:Record, context) {
ListWrapper.push(this.loggedValues, record.currentValue);
ListWrapper.push(this.log, context + '=' + this._asString(record.currentValue));
onRecordChange(group, records:List) {
var value = records[0].currentValue;
var dest = records[0].protoRecord.dest;
ListWrapper.push(this.log, dest + '=' + this._asString(value));
var values = ListWrapper.map(records, (r) => r.currentValue);
ListWrapper.push(this.loggedValues, values);
}
_asString(value) {

2
modules/change_detection/test/record_range_spec.js
View File

@ -46,7 +46,7 @@ export function main() {
}
function createRecord(rr) {
return new Record(rr, new ProtoRecord(null, 0, null, null, null, null), null);
return new Record(rr, new ProtoRecord(null, 0, null, null, null, null, null), null);
}
describe('record range', () => {

5
modules/core/src/compiler/interfaces.js Normal file
View File

@ -0,0 +1,5 @@
export class OnChange {
onChange(changes) {
throw "not implemented";
}
}

112
modules/core/src/compiler/view.js
View File

@ -1,5 +1,5 @@
import {DOM, Element, Node, Text, DocumentFragment, TemplateElement} from 'facade/dom';
import {ListWrapper, MapWrapper, List} from 'facade/collection';
import {ListWrapper, MapWrapper, StringMapWrapper, List} from 'facade/collection';
import {ProtoRecordRange, RecordRange, WatchGroupDispatcher} from 'change_detection/record_range';
import {Record} from 'change_detection/record';
import {AST} from 'change_detection/parser/ast';
@ -12,6 +12,7 @@ import {FIELD, IMPLEMENTS, int, isPresent, isBlank} from 'facade/lang';
import {Injector} from 'di/di';
import {NgElement} from 'core/dom/element';
import {ViewPort} from './viewport';
import {OnChange} from './interfaces';
const NG_BINDING_CLASS = 'ng-binding';
@ -47,22 +48,55 @@ export class View {
this.viewPorts = null;
}
onRecordChange(record:Record, target) {
onRecordChange(groupMemento, records:List<Record>) {
this._invokeMementoForRecords(records);
if (groupMemento instanceof DirectivePropertyGroupMemento) {
this._notifyDirectiveAboutChanges(groupMemento, records);
}
}
_invokeMementoForRecords(records:List<Record>) {
for(var i = 0; i < records.length; ++i) {
this._invokeMementoFor(records[i]);
}
}
_notifyDirectiveAboutChanges(groupMemento, records:List<Record>) {
var dir = groupMemento.directive(this.elementInjectors);
if (dir instanceof OnChange) {
dir.onChange(this._collectChanges(records));
}
}
// dispatch to element injector or text nodes based on context
if (target instanceof DirectivePropertyMemento) {
_invokeMementoFor(record:Record) {
var memento = record.expressionMemento();
if (memento instanceof DirectivePropertyMemento) {
// we know that it is DirectivePropertyMemento
var directiveMemento:DirectivePropertyMemento = target;
var directiveMemento:DirectivePropertyMemento = memento;
directiveMemento.invoke(record, this.elementInjectors);
} else if (target instanceof ElementPropertyMemento) {
var elementMemento:ElementPropertyMemento = target;
} else if (memento instanceof ElementPropertyMemento) {
var elementMemento:ElementPropertyMemento = memento;
elementMemento.invoke(record, this.bindElements);
} else {
// we know it refers to _textNodes.
var textNodeIndex:number = target;
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.expressionMemento()._setterName, propertyUpdate);
}
return changes;
}
addViewPort(viewPort: ViewPort) {
if (isBlank(this.viewPorts)) this.viewPorts = [];
ListWrapper.push(this.viewPorts, viewPort);
@ -163,7 +197,8 @@ export class ProtoView {
elBinder.textNodeIndices = ListWrapper.create();
}
ListWrapper.push(elBinder.textNodeIndices, indexInParent);
this.protoRecordRange.addRecordsFromAST(expression, this.textNodesWithBindingCount++);
var memento = this.textNodesWithBindingCount++;
this.protoRecordRange.addRecordsFromAST(expression, memento, memento);
}
/**
@ -175,12 +210,8 @@ export class ProtoView {
elBinder.hasElementPropertyBindings = true;
this.elementsWithBindingCount++;
}
this.protoRecordRange.addRecordsFromAST(expression,
new ElementPropertyMemento(
this.elementsWithBindingCount-1,
propertyName
)
);
var memento = new ElementPropertyMemento(this.elementsWithBindingCount-1, propertyName);
this.protoRecordRange.addRecordsFromAST(expression, memento, memento);
}
/**
@ -202,15 +233,15 @@ export class ProtoView {
expression:AST,
setterName:string,
setter:SetterFn) {
this.protoRecordRange.addRecordsFromAST(
expression,
new DirectivePropertyMemento(
this.elementBinders.length-1,
directiveIndex,
setterName,
setter
)
var expMemento = new DirectivePropertyMemento(
this.elementBinders.length-1,
directiveIndex,
setterName,
setter
);
var groupMemento = DirectivePropertyGroupMemento.get(expMemento);
this.protoRecordRange.addRecordsFromAST(expression, expMemento, groupMemento, false);
}
static _createElementInjectors(elements, binders, hostElementInjector) {
@ -363,6 +394,43 @@ export class DirectivePropertyMemento {
}
}
var _groups = MapWrapper.create();
class DirectivePropertyGroupMemento {
_elementInjectorIndex:number;
_directiveIndex:number;
constructor(elementInjectorIndex:number, directiveIndex:number) {
this._elementInjectorIndex = elementInjectorIndex;
this._directiveIndex = directiveIndex;
}
static get(memento:DirectivePropertyMemento) {
var elementInjectorIndex = memento._elementInjectorIndex;
var directiveIndex = memento._directiveIndex;
var id = elementInjectorIndex * 100 + directiveIndex;
if (! MapWrapper.contains(_groups, id)) {
return MapWrapper.set(_groups, id, new DirectivePropertyGroupMemento(elementInjectorIndex, directiveIndex));
}
return MapWrapper.get(_groups, id);
}
directive(elementInjectors:List<ElementInjector>) {
var elementInjector:ElementInjector = elementInjectors[this._elementInjectorIndex];
return elementInjector.getAtIndex(this._directiveIndex);
}
}
class PropertyUpdate {
currentValue;
previousValue;
constructor(currentValue, previousValue) {
this.currentValue = currentValue;
this.previousValue = previousValue;
}
}
//TODO(tbosch): I don't like to have done be called from a different place than notify

1
modules/core/src/core.js
View File

@ -2,6 +2,7 @@
* Define public API for Angular here
*/
export * from './annotations/annotations';
export * from './compiler/interfaces';
export * from './annotations/template_config';
export * from './application';

54
modules/core/test/compiler/view_spec.js
View File

@ -3,6 +3,7 @@ import {ProtoView, ElementPropertyMemento, DirectivePropertyMemento} from 'core/
import {ProtoElementInjector, ElementInjector} from 'core/compiler/element_injector';
import {DirectiveMetadataReader} from 'core/compiler/directive_metadata_reader';
import {Component, Decorator, Template} from 'core/annotations/annotations';
import {OnChange} from 'core/core';
import {ProtoRecordRange} from 'change_detection/record_range';
import {ChangeDetector} from 'change_detection/change_detector';
import {TemplateConfig} from 'core/annotations/template_config';
@ -281,7 +282,7 @@ export function main() {
expect(view.bindElements[0].id).toEqual('buz');
});
it('should consume directive watch expression change.', () => {
it('should consume directive watch expression change', () => {
var pv = new ProtoView(createElement('<div class="ng-binding"></div>'),
new ProtoRecordRange());
pv.bindElement(new ProtoElementInjector(null, 0, [SomeDirective]));
@ -292,6 +293,43 @@ export function main() {
cd.detectChanges();
expect(view.elementInjectors[0].get(SomeDirective).prop).toEqual('buz');
});
it('should notify a directive about changes after all its properties have been set', () => {
var pv = new ProtoView(createElement('<div class="ng-binding"></div>'),
new ProtoRecordRange());
pv.bindElement(new ProtoElementInjector(null, 0, [DirectiveImplementingOnChange]));
pv.bindDirectiveProperty( 0, parser.parseBinding('a').ast, 'a', reflector.setter('a'));
pv.bindDirectiveProperty( 0, parser.parseBinding('b').ast, 'b', reflector.setter('b'));
createView(pv);
ctx.a = 100;
ctx.b = 200;
cd.detectChanges();
var directive = view.elementInjectors[0].get(DirectiveImplementingOnChange);
expect(directive.c).toEqual(300);
});
it('should provide a map of updated properties', () => {
var pv = new ProtoView(createElement('<div class="ng-binding"></div>'),
new ProtoRecordRange());
pv.bindElement(new ProtoElementInjector(null, 0, [DirectiveImplementingOnChange]));
pv.bindDirectiveProperty( 0, parser.parseBinding('a').ast, 'a', reflector.setter('a'));
pv.bindDirectiveProperty( 0, parser.parseBinding('b').ast, 'b', reflector.setter('b'));
createView(pv);
ctx.a = 0;
ctx.b = 0;
cd.detectChanges();
ctx.a = 100;
cd.detectChanges();
var directive = view.elementInjectors[0].get(DirectiveImplementingOnChange);
expect(directive.changes["a"].currentValue).toEqual(100);
expect(directive.changes["b"]).not.toBeDefined();
});
});
});
@ -324,6 +362,18 @@ class SomeDirective {
}
}
class DirectiveImplementingOnChange extends OnChange {
a;
b;
c;
changes;
onChange(changes) {
this.c = this.a + this.b;
this.changes = changes;
}
}
class SomeService {}
@Component({
@ -368,6 +418,8 @@ class AnotherDirective {
class MyEvaluationContext {
foo:string;
a;
b;
constructor() {
this.foo = 'bar';
};