Integrate getCurrentWindow() and getRootWindow() and getCurrentController() and getRootController() in NS Core > Utils

[kefahB]

Hi @NathanWalker, @triniwiz, @rigor789, @farfromrefug

As I saw the last year, a lot of plugins had issue when come to get the root/current window or the root/current controller, I personally contributed to 5 of them to fix those issues.

The problem that depending of what is the current controller or root or activity the result is not the same, the last issue was in the LoadingIndicator after the BarcodeScanner is closed the loader goes behind the activity or it is not shown at all because the current activity was the barcode scanner one, for that we need to add a helper that return the correct root/view/controller what ever.

I remember that there is still a issue with @nativescript/social-share until today on ios with this exacte problem.

This will be a huge relafe for plugin authors and will prevent a lot of issue for the future.

Here what I found from others plugins to get the correct one but I am sure you can do better :)

IOS

getRootWindow() {
        const rootVc = this._rootViewController || Utils.ios.getRootViewController() || 
        this.findTopViewController(Frame.topmost().currentPage.ios);
        if (rootVc?.view) {
            return rootVc.view;
        }
        else if(rootVc && !rootVc?.view) {
            return rootVc;
        }
        else {
            return null;
        }
}

get _rootViewController() {
        const keyWindow = UIApplication.sharedApplication.keyWindow;
        return keyWindow != null ? keyWindow.rootViewController : undefined;
}

findTopViewController(root) {
        const presented = root.presentedViewController;
        if (presented !== null) {
            return this.findTopViewController(presented);
        }
        if (root instanceof UISplitViewController) {
            const last = root.viewControllers.lastObject;
            if (last == null) {
                return root;
            }
            return this.findTopViewController(last);
        }
        else if (root instanceof UINavigationController) {
            const top = root.topViewController;
            if (top == null) {
                return root;
            }
            return this.findTopViewController(top);
        }
        else if (root instanceof UITabBarController) {
            const selected = root.selectedViewController;
            if (selected == null) {
                return root;
            }
            return this.findTopViewController(selected);
        }
        else {
            if (presented === root.presentedViewController) {
                return presented;
            }
            else {
                return root;
            }
      }
}

ANDROID

// current View
const view = Frame.topmost().android?.rootViewGroup || Frame.topmost().currentPage?.android;

// Window
Utils.android.getCurrentActivity().getWindow();

// Current Focus view
Utils.android.getCurrentActivity().getCurrentFocus()

// Root view
Utils.android.getCurrentActivity().getWindow().getDecorView().getRootView()


// Fragments
const activity = Application.android.startActivity || Application.android.foregroundActivity;
const fragments = activity instanceof androidx.fragment.app.FragmentActivity ? activity?.getSupportFragmentManager().getFragments() : Utils.android.getCurrentActivity().getFragmentManager().getFragments();