NativeScript/nativescript-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 module 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}`;
	}
}