I am creating an app that allows the user to drag and drop to put one image on top of another using Xamarin.Forms.
On iOS I managed to hack together a workable gesture recognizer renderer by creating a custom ContentView and a custom renderer for it, which then attaches native gesture recognizers to itself based on the GestureRecognizers elements. To do that I disable the default EventTracker and implement my own, with overridden GetNativeRecognizer method
in the custom renderer:
public InteractiveContentViewRenderer () : base ()
{
AutoTrack = false;
events = new InteractiveEventTracker (this);
}
in the custom event tracker:
public InteractiveEventTracker (IVisualElementRenderer renderer) : base (renderer)
{
this.Renderer = renderer;
}
protected override MonoTouch.UIKit.UIGestureRecognizer GetNativeRecognizer (Xamarin.Forms.IGestureRecognizer recognizer)
{
var gestureRecognizer = base.GetNativeRecognizer (recognizer);
if (gestureRecognizer == null) {
// here I find my own native recognizer and return it
}
}
On Android, however, so far I haven't figured out how to achieve the same thing. There's no EventTracker in Android, I think I'll have to implement some Android View for this to work but I haven't figured it out so far.
Has anyone managed to hack together touch events in Xamarin.Forms for Android? I'd like to know at least the basic structure of the hack?
