NativeScript/tns-core-modules/ui/layouts/dock-layout/dock-layout-common.ts

import { DockLayout as DockLayoutDefinition, Dock } from ".";
import { LayoutBase, View, Property, isIOS, booleanConverter, makeValidator, makeParser } from "../layout-base";

function validateArgs(element: View): View {
    if (!element) {
        throw new Error("element cannot be null or undefinied.");
    }
    return element;
}

export * from "../layout-base";

export class DockLayoutBase extends LayoutBase implements DockLayoutDefinition {

    public static getDock(element: View): Dock {
        return validateArgs(element).dock;
    }

    public static setDock(element: View, value: Dock): void {
        validateArgs(element).dock = value;
    }

    public stretchLastChild: boolean;

    public onDockChanged(view: View, oldValue: Dock, newValue: Dock) {
        //
    }
}

// DockLayoutBase.prototype.recycleNativeView = true;

const dockConverter = makeParser<Dock>(makeValidator<Dock>("left", "top", "right", "bottom"));
export const dockProperty = new Property<View, Dock>({
    name: "dock", defaultValue: "left", valueChanged: (target, oldValue, newValue) => {
        if (target instanceof View) {
            const layout = target.parent;
            if (layout instanceof DockLayoutBase) {
                layout.onDockChanged(target, oldValue, newValue);
            }
        }
    }, valueConverter: dockConverter
});
dockProperty.register(View);

export const stretchLastChildProperty = new Property<DockLayoutBase, boolean>({
    name: "stretchLastChild", defaultValue: true, affectsLayout: isIOS, valueConverter: booleanConverter
});
stretchLastChildProperty.register(DockLayoutBase);