Function handleOnBackPressed

packages/core/ui/frame/index.android.ts:723–780

()

if (SDK_VERSION >= 33) {
	OnBackPressedCallback = (<any>androidx.activity.OnBackPressedCallback).extend('com.tns.OnBackPressedCallback', {
		handleOnBackPressed() {
			if (Trace.isEnabled()) {
				Trace.write('NativeScriptActivity.onBackPressed;', Trace.categories.NativeLifecycle);
			}

			const activity = this['_activity']?.get() as androidx.appcompat.app.AppCompatActivity;
			if (!activity) {
				if (Trace.isEnabled()) {
					Trace.write('NativeScriptActivity.onBackPressed; Activity is null, calling super', Trace.categories.NativeLifecycle);
				}

				this.setEnabled(false);
				return;
			}

			const args = <AndroidActivityBackPressedEventData>{
				eventName: 'activityBackPressed',
				object: Application,
				android: Application.android,
				activity: activity,
				cancel: false,
			};

			Application.android.notify(args);

			if (args.cancel) {
				return;
			}

			const callbacks: AndroidActivityCallbacks = activity[CALLBACKS];
			let callSuper: boolean = false;

			if (callbacks) {
				const view = callbacks.getRootView();

				if (view) {
					const viewArgs = <AndroidActivityBackPressedEventData>{
						eventName: 'activityBackPressed',
						object: view,
						activity: activity,
						cancel: false,
					};

					view.notify(viewArgs);

					// In the case of Frame, use this callback only if it was overridden, since the original will cause navigation issues
					if (!viewArgs.cancel && (view.onBackPressed === Frame.prototype.onBackPressed || !view.onBackPressed())) {
						callSuper = view instanceof Frame ? !Frame.goBack() : true;
					}
				}
			}

			if (callSuper) {
				this.setEnabled(false);
				activity.getOnBackPressedDispatcher().onBackPressed();
				this.setEnabled(true);
			}
		},