public void RaiseValueChanged(ValueChangedEventArgs args = null)
{
if (args == null)
args = ValueChangedEventArgs.FalseEventArgs;
var handler = ValueChanged;
if (handler != null) handler(this, args);
}
private void OneTimeSourceHandler(IObserver sender, ValueChangedEventArgs args)
{
IDataBinding binding = Binding;
if (binding != null && binding.TargetAccessor.IsAllMembersAvailable() && binding.SourceAccessor.IsAllMembersAvailable(true))
{
UnsubscribeSources(OneTimeSourceHandler);
binding.UpdateSource();
}
}
private void OneTimeTargetHandler(IObserver sender, ValueChangedEventArgs args)
{
IDataBinding binding = Binding;
if (binding != null && binding.TargetAccessor.IsAllMembersAvailable() && binding.SourceAccessor.IsAllMembersAvailable())
{
binding.TargetAccessor.Source.ValueChanged -= OneTimeTargetHandler;
binding.UpdateTarget();
}
}
private void OneTimeHandler(IObserver sender, ValueChangedEventArgs args)
{
IDataBinding binding = Binding;
if (binding == null || !binding.TargetAccessor.IsAllMembersAvailable() || !binding.SourceAccessor.IsAllMembersAvailable(true))
return;
EventHandler<IObserver, ValueChangedEventArgs> handler = OneTimeHandler;
UnsubscribeSources(handler);
binding.TargetAccessor.Source.ValueChanged -= handler;
binding.UpdateTarget();
if (_disposeBinding)
binding.Dispose();
}
/// <summary>
/// Updates the source binding when target value changed.
/// </summary>
private void TargetOnValueChanged(IBindingSource sender, ValueChangedEventArgs args)
{
Binding.UpdateSource();
}
private void OnDataContextChanged(ValueChangedEventArgs message)
{
_isInvoked = true;
var handler = ValueChanged;
if (handler != null)
handler(this, message);
}
private void ObserverOnValueChanged(IObserver sender, ValueChangedEventArgs args)
{
OnDataContextChanged(args);
}
private void OnDataContextChanged(ValueChangedEventArgs message)
{
_isInvoked = true;
ValueChanged?.Invoke(this, message);
}
static ValueChangedEventArgs()
{
TrueEventArgs = new ValueChangedEventArgs(true);
FalseEventArgs = new ValueChangedEventArgs(false);
}
private void OnBindingSourceValueChanged(IObserver sender, ValueChangedEventArgs args)
{
if (args.LastMemberChanged && !sender.Path.IsEmpty)
return;
UpdateSources(false);
UpdateErrors(null);
}
public void RaiseValueChanged(ValueChangedEventArgs args = null)
{
if (args == null)
args = ValueChangedEventArgs.FalseEventArgs;
IHandler<ValueChangedEventArgs> handler = Listener;
if (handler != null) handler.Handle(this, args);
}
private void SourceOnValueChanged(IObserver sender, ValueChangedEventArgs args)
{
Binding.UpdateTarget();
}
