NativeScript/nativescript-core/ui/tab-navigation-base/tab-content-item/index.android.ts

// Types
import { TabContentItem as TabContentItemDefinition } from ".";
import { TabNavigationBase } from "../tab-navigation-base";
import { GridLayout } from "../../layouts/grid-layout";

// Requires
import { TabContentItemBase, traceCategory } from "./tab-content-item-common";
import { View } from "../../core/view";
import { Trace } from "../../../trace";

export * from "./tab-content-item-common";

export class TabContentItem extends TabContentItemBase {
	public nativeViewProtected: org.nativescript.widgets.GridLayout;
	public tabItemSpec: org.nativescript.widgets.TabItemSpec;
	public index: number;

	get _hasFragments(): boolean {
		return true;
	}

	public createNativeView() {
		const layout = new org.nativescript.widgets.GridLayout(this._context);
		layout.addRow(
			new org.nativescript.widgets.ItemSpec(
				1,
				org.nativescript.widgets.GridUnitType.star
			)
		);

		return layout;
	}

	public initNativeView(): void {
		super.initNativeView();
	}

	public _addViewToNativeVisualTree(child: View, atIndex?: number): boolean {
		// Set the row property for the child
		if (this.nativeViewProtected && child.nativeViewProtected) {
			GridLayout.setRow(child, 0);
		}

		return super._addViewToNativeVisualTree(child, atIndex);
	}

	public disposeNativeView(): void {
		super.disposeNativeView();
		(<TabContentItemDefinition>this).canBeLoaded = false;
	}

	public _getChildFragmentManager(): androidx.fragment.app.FragmentManager {
		const tabView = <TabNavigationBase>this.parent;
		let tabFragment = null;
		const fragmentManager = tabView._getFragmentManager();

		if (typeof this.index === "undefined") {
			Trace.write(
				`Current TabContentItem index is not set`,
				traceCategory,
				Trace.messageType.error
			);
		}

		for (let fragment of <Array<any>>(
			fragmentManager.getFragments().toArray()
		)) {
			if (fragment.index === this.index) {
				tabFragment = fragment;
				break;
			}
		}

		// TODO: can happen in a modal tabview scenario when the modal dialog fragment is already removed
		if (!tabFragment) {
			// if (Trace.isEnabled()) {
			//     Trace.write(`Could not get child fragment manager for tab item with index ${this.index}`, traceCategory);
			// }

			// TODO: fix d.ts in view module
			return (<any>tabView)._getRootFragmentManager();
		}

		return tabFragment.getChildFragmentManager();
	}
}