demo/app/main-view-model.ts
import { Observable } from 'data/observable';
export class HelloWorldModel extends Observable {
private _counter: number;
private _message: string;
constructor() {
super();
// Initialize default values.
this._counter = 42;
this.updateMessage();
}
get message(): string {
return this._message;
}
set message(value: string) {
if (this._message !== value) {
this._message = value;
this.notifyPropertyChange('message', value);
}
}
public onTap() {
this._counter--;
this.updateMessage();
}
private updateMessage() {
if (this._counter <= 0) {
this.message = 'Hoorraaay! You unlocked the NativeScript clicker achievement!';
} else {
this.message = `${this._counter} taps left`;
}
}
}