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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | 15x 15x 81x 81x 142x 137x 6x 6x 77x 69x 212x 111x 101x 101x 101x 101x 101x 101x 101x 95x 95x 6x 6x 101x 101x 29x 15x | /**
* Mixin to trigger updates when the properties or the state change
* @param Base
* @returns
*/
const ReactiveElementMixin = Base =>
class ReactiveElement extends Base {
/**
* Flag that tests if there is an update in progress so no other updates are requested
*/
private _hasPendingUpdate: boolean = false;
/**
* Promise to schedule the updates
*/
private _updatePromise: Promise<void> = new Promise<void>((resolve, reject) => resolve()); // Finished updating by default
protected setProperty(name: string, value: any): void {
if (super.setProperty?.(name, value) === true) {
this.update();
}
}
protected setState(key: string, value: any): void {
Eif (super.setState?.(key, value) === true) {
this.update();
}
}
connectedCallback() {
super.connectedCallback?.();
this.update(); // First update
}
/**
* Requests the custom element to be updated
*/
protected update(): void {
if (this._hasPendingUpdate) {
return;
}
this._updatePromise = this._enqueueUpdate();
}
private async _enqueueUpdate(): Promise<void> {
this._hasPendingUpdate = true;
try {
await this._updatePromise; // Wait for the previous update to finish
}
catch (error) {
Promise.reject(error);
}
return new Promise<void>((resolve, reject) => {
try {
this.updateDom();
this._markUpdated();
resolve();
}
catch (error) {
this._markUpdated();
reject(error);
}
});
}
private _markUpdated() {
this._hasPendingUpdate = false;
this.clearChangedProperties();
}
get updateComplete(): Promise<void> {
return this._updatePromise;
}
}
export default ReactiveElementMixin; |