NativeScript/packages/core/ui/transition/index.android.ts

// Types.
import { _resolveAnimationCurve } from '../animation';
import lazy from '../../utils/lazy';

const _defaultInterpolator = lazy(() => new android.view.animation.AccelerateDecelerateInterpolator());

export namespace AndroidTransitionType {
	export const enter = 'enter';
	export const exit = 'exit';
	export const popEnter = 'popEnter';
	export const popExit = 'popExit';
}

let transitionId = 0;
export class Transition {
	private _duration: number;
	private _interpolator: android.view.animation.Interpolator;
	private _id: number;

	constructor(duration: number, curve: any) {
		this._duration = duration;
		this._interpolator = curve ? _resolveAnimationCurve(curve) : _defaultInterpolator();
		this._id = transitionId++;
	}

	public getDuration(): number {
		return this._duration;
	}

	public getCurve(): android.view.animation.Interpolator {
		return this._interpolator;
	}

	public animateIOSTransition(containerView: any, fromView: any, toView: any, operation: any, completion: (finished: boolean) => void): void {
		throw new Error('Abstract method call');
	}

	public createAndroidAnimator(transitionType: string): android.animation.Animator {
		throw new Error('Abstract method call');
	}

	public toString(): string {
		return `Transition@${this._id}`;
	}
}