NativeScript/nativescript-core/ui/layouts/absolute-layout/index.android.ts

import {
	AbsoluteLayoutBase,
	leftProperty,
	topProperty,
} from "./absolute-layout-common";
import { View } from "../../core/view";
import { Length } from "../../styling/style-properties";

export * from "./absolute-layout-common";

function makeNativeSetter<T>(
	setter: (
		this: View,
		lp: org.nativescript.widgets.CommonLayoutParams,
		value: T
	) => void
) {
	return function (this: View, value: T) {
		const nativeView: android.view.View = this.nativeViewProtected;
		const lp =
			nativeView.getLayoutParams() ||
			new org.nativescript.widgets.CommonLayoutParams();
		if (lp instanceof org.nativescript.widgets.CommonLayoutParams) {
			setter.call(this, lp, value);
			nativeView.setLayoutParams(lp);
		}
	};
}

View.prototype[topProperty.setNative] = makeNativeSetter<number>(function (
	this: View,
	lp,
	value
) {
	lp.top = Length.toDevicePixels(value, 0);
});
View.prototype[leftProperty.setNative] = makeNativeSetter<number>(function (
	this: View,
	lp,
	value
) {
	lp.left = Length.toDevicePixels(value, 0);
});

export class AbsoluteLayout extends AbsoluteLayoutBase {
	nativeViewProtected: org.nativescript.widgets.AbsoluteLayout;

	public createNativeView() {
		return new org.nativescript.widgets.AbsoluteLayout(this._context);
	}
}