[forms-devel] Fixing SetNativeControl logic when replacing native controls

Toni Petrina tonipetrina at hotmail.com
Sat Jul 2 16:22:42 UTC 2016



It is hard to replace a native control inside a renderer with your own. You cannot even replace ListView in Android because there are nasty NullRefs happening if you do so! Consider the following code:


var ctx = Context;
nativeListView = new AListView(ctx);
_refresh = new SwipeRefreshLayout(ctx);
_refresh.AddView(nativeListView, LayoutParams.MatchParent);
SetNativeControl(nativeListView, _refresh); 



If I want to use my subclass instead of Android.Widget.ListView, I have to reimplement entire ListViewRenderer which is impossible due to all internal classes. It would be much better if there is a method called GetNativeControll so that the above code looks more like:


protected override AListView GetNativeControl() => new AListView(Context); 


var ctx = Context;
nativeListView = GetNativeControl();

This way I can override the default control to be used with my own subclass.



Toni Petrina


P.S. Not having markdown in email is frustrating!

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