private async void OnContentUnloaded(
object sender,
EventArgs eventArgs)
{
if (!(sender is FrameworkElement content))
{
return;
}
var registrationInfo = Registrations?.FirstOrDefault(
registration => registration.ViewType == content.GetType());
if (registrationInfo == null)
{
DetachDisappearingEventListener(content);
return;
}
if (content.DataContext is IHandleClosing viewModel)
{
await viewModel.OnClosing();
}
if (registrationInfo.InterestedType != null)
{
await ResolveAndInformListenerAsync(
registrationInfo.InterestedType)
.ConfigureAwait(false);
}
DetachDisappearingEventListener(content);
}
/// <inheritdoc/>
public void UnRegister(string taskName)
{
var task = Registrations.FirstOrDefault(r => r.Name == taskName);
if (task != null)
{
task.Unregister(false);
Registrations.Remove(task);
}
}
private async void OnViewClosing(
object sender,
EventArgs eventArgs)
{
if (!(sender is Page page))
{
return;
}
var registrationInfo = Registrations?.FirstOrDefault(
registration => registration.ViewType == page.GetType());
if (registrationInfo == null)
{
DetachDisappearingEventListener(
page);
return;
}
if (page.BindingContext is IHandleClosing viewModel)
{
await viewModel.OnClosing();
}
if (registrationInfo.InterestedType != null)
{
await ResolveAndInformListenerAsync(
registrationInfo.InterestedType)
.ConfigureAwait(false);
}
DetachDisappearingEventListener(page);
}
