NativeScript/tns-core-modules/ui/tab-navigation-base/tab-content-item/tab-content-item-common.ts

// Types
import { TabContentItem as TabContentItemDefinition } from ".";
import { AddChildFromBuilder } from "../../core/view";
import { TabNavigationBase } from "../tab-navigation-base";

// Requires
import { View, ViewBase, CSSType } from "../../core/view";
import { ContentView } from "../../content-view";
export const traceCategory = "TabView";

@CSSType("TabContentItem")
export abstract class TabContentItemBase extends ContentView implements TabContentItemDefinition, AddChildFromBuilder {

    public eachChild(callback: (child: View) => boolean) {
        if (this.content) {
            callback(this.content);
        }
    }

    public loadView(view: ViewBase): void {
        const tabView = <TabNavigationBase>this.parent;
        if (tabView && tabView.items) {
            // Don't load items until their fragments are instantiated.
            if ((<TabContentItemDefinition>this).canBeLoaded) {
                super.loadView(view);
            }
        }
    }
}