Touch event cancels Tap Gesture Recognizer in xamarin - xamarin

Question

I am using SkiaSharp library to draw on canvas .
and I need to set a tap recognizer to a specific function when I double tap .
and the touch event of the canvas to do another functions .
each one works well separately but when I use them both , the Touch event cancels the Tap Recognizer .
is there is any way to use them both ?
<skia:SKCanvasView x:Name="canvasView"
PaintSurface="canvasView_paintSurface"
VerticalOptions="FillAndExpand"
EnableTouchEvents="true"
Touch="OnTouch">
<skia:SKCanvasView.GestureRecognizers >
<TapGestureRecognizer NumberOfTapsRequired="2" Tapped="OnTapped" >
</TapGestureRecognizer>
</skia:SKCanvasView.GestureRecognizers>
</skia:SKCanvasView>
private void OnTapped(object sender, EventArgs e)
{
DisplayAlert("hello", "OnTapped", "Ok", "Cancel");
}
private async void OnTouch(object sender, SKTouchEventArgs e)
{
DisplayAlert("hello", "OnTouch", "Ok", "Cancel");
}

Answer 1

One way of solving this is by creating two tap gesture recognizers and a timer to check the succession of the taps. This way you know whether there was a touch or a double tap
private bool tapHandled;
public XYZPage() : base()
{
var tgr = new TapGestureRecognizer();
tgr.NumberOfTapsRequired = 1;
tgr.Tapped += tapped;
GestureRecognizers.Add(tgr);
var ttgr = new TapGestureRecognizer();
ttgr.NumberOfTapsRequired = 2;
ttgr.Tapped += doubletapped;
GestureRecognizers.Add(ttgr);
}
private void tapped(object sender, EventArgs e)
{
tapHandled = false;
Xamarin.Forms.Device.StartTimer(new TimeSpan(0, 0, 0, 0, 300), taptimer);
}
private void doubletapped(object sender, EventArgs e)
{
tapHandled = true;
// do double tap work here
DisplayAlert("hello", "OnDoubleTapped", "Ok", "Cancel");
}
private bool taptimer()
{
if (!tapHandled)
{
tapHandled = true;
// do Touch stuff here
DisplayAlert("hello", "OnTouch", "Ok", "Cancel");
}
return false;
}