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Add type annotations to ConcatList

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This commit is contained in:
Danila Fedorin 2021-09-29 19:28:00 -07:00
parent 588da9b719
commit 3b131f2db6
1 changed files with 21 additions and 18 deletions
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39
src/observable/list/ConcatList.ts
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@ -14,16 +14,18 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
import {BaseObservableList} from "./BaseObservableList";
import {BaseObservableList, IListObserver} from "./BaseObservableList";
export class ConcatList extends BaseObservableList {
constructor(...sourceLists) {
export class ConcatList<T> extends BaseObservableList<T> implements IListObserver<T> {
protected _sourceLists: BaseObservableList<T>[];
protected _sourceUnsubscribes: (() => void)[] | null = null;
constructor(...sourceLists: BaseObservableList<T>[]) {
super();
this._sourceLists = sourceLists;
this._sourceUnsubscribes = null;
}
_offsetForSource(sourceList) {
_offsetForSource(sourceList: BaseObservableList<T>): number {
const listIdx = this._sourceLists.indexOf(sourceList);
let offset = 0;
for (let i = 0; i < listIdx; ++i) {
@ -32,17 +34,17 @@ export class ConcatList extends BaseObservableList {
return offset;
}
onSubscribeFirst() {
onSubscribeFirst(): void {
this._sourceUnsubscribes = this._sourceLists.map(sourceList => sourceList.subscribe(this));
}
onUnsubscribeLast() {
for (const sourceUnsubscribe of this._sourceUnsubscribes) {
onUnsubscribeLast(): void {
for (const sourceUnsubscribe of this._sourceUnsubscribes!) {
sourceUnsubscribe();
}
}
onReset() {
onReset(): void {
// TODO: not ideal if other source lists are large
// but working impl for now
// reset, and
@ -54,11 +56,11 @@ export class ConcatList extends BaseObservableList {
}
}
onAdd(index, value, sourceList) {
onAdd(index: number, value: T, sourceList: BaseObservableList<T>): void {
this.emitAdd(this._offsetForSource(sourceList) + index, value);
}
onUpdate(index, value, params, sourceList) {
onUpdate(index: number, value: T, params: any, sourceList: BaseObservableList<T>): void {
// if an update is emitted while calling source.subscribe() from onSubscribeFirst, ignore it
// as we are not supposed to call `length` on any uninitialized list
if (!this._sourceUnsubscribes) {
@ -67,16 +69,16 @@ export class ConcatList extends BaseObservableList {
this.emitUpdate(this._offsetForSource(sourceList) + index, value, params);
}
onRemove(index, value, sourceList) {
onRemove(index: number, value: T, sourceList: BaseObservableList<T>): void {
this.emitRemove(this._offsetForSource(sourceList) + index, value);
}
onMove(fromIdx, toIdx, value, sourceList) {
onMove(fromIdx: number, toIdx: number, value: T, sourceList: BaseObservableList<T>): void {
const offset = this._offsetForSource(sourceList);
this.emitMove(offset + fromIdx, offset + toIdx, value);
}
get length() {
get length(): number {
let len = 0;
for (let i = 0; i < this._sourceLists.length; ++i) {
len += this._sourceLists[i].length;
@ -105,6 +107,7 @@ export class ConcatList extends BaseObservableList {
}
import {ObservableArray} from "./ObservableArray";
import {defaultObserverWith} from "./BaseObservableList";
export async function tests() {
return {
test_length(assert) {
@ -133,13 +136,13 @@ export async function tests() {
const list2 = new ObservableArray([11, 12, 13]);
const all = new ConcatList(list1, list2);
let fired = false;
all.subscribe({
all.subscribe(defaultObserverWith({
onAdd(index, value) {
fired = true;
assert.equal(index, 4);
assert.equal(value, 11.5);
}
});
}));
list2.insert(1, 11.5);
assert(fired);
},
@ -148,13 +151,13 @@ export async function tests() {
const list2 = new ObservableArray([11, 12, 13]);
const all = new ConcatList(list1, list2);
let fired = false;
all.subscribe({
all.subscribe(defaultObserverWith({
onUpdate(index, value) {
fired = true;
assert.equal(index, 4);
assert.equal(value, 10);
}
});
}));
list2.emitUpdate(1, 10);
assert(fired);
},