NativeScript/nativescript-core/ui/transition/slide-transition.android.ts

import * as transition from ".";
import * as platform from "../../platform";
import lazy from "../../utils/lazy";

const screenWidth = lazy(() => platform.screen.mainScreen.widthPixels);
const screenHeight = lazy(() => platform.screen.mainScreen.heightPixels);

export class SlideTransition extends transition.Transition {
	private _direction: string;

	constructor(direction: string, duration: number, curve: any) {
		super(duration, curve);
		this._direction = direction;
	}

	public createAndroidAnimator(
		transitionType: string
	): android.animation.Animator {
		const translationValues = Array.create("float", 2);
		switch (this._direction) {
			case "left":
				switch (transitionType) {
					case transition.AndroidTransitionType.enter:
						translationValues[0] = screenWidth();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.exit:
						translationValues[0] = 0;
						translationValues[1] = -screenWidth();
						break;
					case transition.AndroidTransitionType.popEnter:
						translationValues[0] = -screenWidth();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.popExit:
						translationValues[0] = 0;
						translationValues[1] = screenWidth();
						break;
				}
				break;
			case "right":
				switch (transitionType) {
					case transition.AndroidTransitionType.enter:
						translationValues[0] = -screenWidth();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.exit:
						translationValues[0] = 0;
						translationValues[1] = screenWidth();
						break;
					case transition.AndroidTransitionType.popEnter:
						translationValues[0] = screenWidth();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.popExit:
						translationValues[0] = 0;
						translationValues[1] = -screenWidth();
						break;
				}
				break;
			case "top":
				switch (transitionType) {
					case transition.AndroidTransitionType.enter:
						translationValues[0] = screenHeight();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.exit:
						translationValues[0] = 0;
						translationValues[1] = -screenHeight();
						break;
					case transition.AndroidTransitionType.popEnter:
						translationValues[0] = -screenHeight();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.popExit:
						translationValues[0] = 0;
						translationValues[1] = screenHeight();
						break;
				}
				break;
			case "bottom":
				switch (transitionType) {
					case transition.AndroidTransitionType.enter:
						translationValues[0] = -screenHeight();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.exit:
						translationValues[0] = 0;
						translationValues[1] = screenHeight();
						break;
					case transition.AndroidTransitionType.popEnter:
						translationValues[0] = screenHeight();
						translationValues[1] = 0;
						break;
					case transition.AndroidTransitionType.popExit:
						translationValues[0] = 0;
						translationValues[1] = -screenHeight();
						break;
				}
				break;
		}

		let prop;

		if (this._direction === "left" || this._direction === "right") {
			prop = "translationX";
		} else {
			prop = "translationY";
		}

		const animator = android.animation.ObjectAnimator.ofFloat(
			null,
			prop,
			translationValues
		);
		const duration = this.getDuration();
		if (duration !== undefined) {
			animator.setDuration(duration);
		}
		animator.setInterpolator(this.getCurve());

		return animator;
	}

	public toString(): string {
		return `${super.toString()} ${this._direction}`;
	}
}