public void StopWatchingForChangesOnLayout(VisualElement visualElement, object handle)
{
if (!(handle is System.Runtime.CompilerServices.ConditionalWeakTable <AView, DualScreenGlobalLayoutListener> table))
{
return;
}
DualScreenGlobalLayoutListener ggl = null;
var view = Platform.Android.Platform.GetRenderer(visualElement);
var androidView = view?.View;
if (androidView == null || !(table.TryGetValue(androidView, out ggl)))
{
foreach (var pair in table)
{
ggl = pair.Value;
}
}
if (ggl == null)
{
return;
}
try
{
ggl.Invalidate();
}
catch
{
// just in case something along the call path here is disposed of
}
if (androidView == null || !androidView.IsAlive())
{
return;
}
try
{
androidView.ViewTreeObserver.RemoveOnGlobalLayoutListener(ggl);
}
catch
{
// just in case something along the call path here is disposed of
}
}
public object WatchForChangesOnLayout(VisualElement visualElement, Action action)
{
if (action == null)
{
return(null);
}
var view = Platform.Android.Platform.GetRenderer(visualElement);
var androidView = view?.View;
if (androidView == null || !androidView.IsAlive())
{
return(null);
}
var listener = new DualScreenGlobalLayoutListener(action, androidView);
var table = new System.Runtime.CompilerServices.ConditionalWeakTable <AView, DualScreenGlobalLayoutListener>();
androidView.ViewTreeObserver.AddOnGlobalLayoutListener(listener);
table.Add(androidView, listener);
return(table);
}
