private void OnCurrentPageChanged(Page page)
{
_currentPageSubscription?.Dispose();
if (page == null)
{
return;
}
page.BindingContextChanged += bindingContextChanged;
_currentPageSubscription = new ActionDisposable(() => page.BindingContextChanged -= bindingContextChanged);
Device.BeginInvokeOnMainThread(() =>
{
object bindingContext = null;
try {
bindingContext = page.BindingContext;
} catch {
// Page._properties might not be initialized yet, so BindingContext throws NRE
}
if (bindingContext != null)
{
OnCurrentPageBindingContextChanged(bindingContext);
}
});
void bindingContextChanged(object sender, EventArgs e)
{
OnCurrentPageBindingContextChanged(page.BindingContext);
}
}
private void OnCurrentPageBindingContextChanged(object bindingContext)
{
if (bindingContext is INotifyPropertyChanged inpc)
{
if (_currentBindingContext != inpc)
{
_currentBindingContextDisposable?.Dispose();
var instanceInspector = new InstanceInspector(inpc);
inpc.PropertyChanged += inpcPropertyChanged;
_currentBindingContext = inpc;
_currentBindingContextDisposable = new ActionDisposable(() => inpc.PropertyChanged -= inpcPropertyChanged);
void inpcPropertyChanged(object sender, PropertyChangedEventArgs e)
{
var existingInspector = instanceInspector.Properties.FirstOrDefault(pi => pi.PropertyInfo.Name == e.PropertyName);
if (existingInspector != null)
{
existingInspector.UpdateValue(inpc);
}
else
{
// If property was added without our knowledge (dynamic stuff)
var properties = InstanceInspector.GetAllProperties(inpc);
var property = properties.FirstOrDefault(p => p.Name == e.PropertyName);
if (property != null)
{
instanceInspector.Properties.Add(new PropertyInspector(property, inpc));
}
}
SendInstanceUpdate(instanceInspector.Key, instanceInspector.Serialize());
}
SendInstanceUpdate(instanceInspector.Key, instanceInspector.Serialize());
}
}
}