private void SetValue(object newValue)
{
if (newValue == null)
{
UnsubscribeCommand();
_valueReference = null;
return;
}
var command = newValue as ICommand;
if (command == null)
{
if (!(newValue is BindingActionValue))
{
throw BindingExceptionManager.InvalidEventSourceValue(_currentValue.Member, newValue);
}
_valueReference = newValue;
}
else
{
var reference = _valueReference as WeakReference;
if (reference != null && ReferenceEquals(reference.Target, command))
{
return;
}
UnsubscribeCommand();
_valueReference = ToolkitExtensions.GetWeakReferenceOrDefault(command, null, true);
if (_toggleEnabledState && InitializeCanExecuteDelegate(command))
{
CommandOnCanExecuteChanged(command);
command.CanExecuteChanged += _canExecuteHandler;
}
}
}
private void SetParent(object source, object value)
{
if (source == null || ReferenceEquals(value, _parent.Target))
return;
_parent = ToolkitExtensions.GetWeakReferenceOrDefault(value, Empty.WeakReference, false);
Raise(source, EventArgs.Empty);
}
private ParentObserver(FrameworkElement view)
{
_view = ServiceProvider.WeakReferenceFactory(view);
_parent = ToolkitExtensions.GetWeakReferenceOrDefault(FindParent(view), Empty.WeakReference, false);
RoutedEventHandler handler = OnChanged;
view.Loaded += handler;
view.Unloaded += handler;
}
private void SetParent(object value)
{
var view = GetSource();
if (view == null)
{
return;
}
if (ReferenceEquals(value, _parent.Target))
{
return;
}
_parent = ToolkitExtensions.GetWeakReferenceOrDefault(value, Empty.WeakReference, false);
Raise(view, EventArgs.Empty);
}
private void SetValue(object newValue, IBindingPathMembers pathMembers)
{
if (newValue == null)
{
UnsubscribeCommand();
_valueReference = null;
return;
}
var command = newValue as ICommand;
if (command == null)
{
if (!(newValue is BindingActionValue))
{
throw BindingExceptionManager.InvalidEventSourceValue(_currentValue.Member, newValue);
}
_valueReference = newValue;
if (_path.IsDebuggable)
{
DebugInfo($"Binding will use event: '{pathMembers.LastMember.Path}' to update member: '{((BindingActionValue)newValue).Member.Path}'", new[] { newValue });
}
}
else
{
var reference = _valueReference as WeakReference;
if (reference != null && ReferenceEquals(reference.Target, command))
{
return;
}
if (_path.IsDebuggable)
{
DebugInfo($"Binding will use event: '{pathMembers.LastMember.Path}' to update command: '{newValue}'", new[] { newValue });
}
UnsubscribeCommand();
_valueReference = ToolkitExtensions.GetWeakReferenceOrDefault(command, null, true);
if (_toggleEnabledState && InitializeCanExecuteDelegate(command))
{
CommandOnCanExecuteChanged(command);
command.CanExecuteChanged += _canExecuteHandler;
}
}
}
private UIView RaiseInternal()
{
var view = GetSource();
if (_isAttached || view == null)
{
return(view);
}
object parent = GetParent(view);
if (ReferenceEquals(parent, _parent.Target))
{
return(view);
}
_parent = ToolkitExtensions.GetWeakReferenceOrDefault(parent, Empty.WeakReference, false);
Raise(view, EventArgs.Empty);
return(view);
}
public void Raise()
{
if (_isAttached)
{
return;
}
var view = GetSource();
if (view == null)
{
return;
}
var parent = GetParent(view);
if (view.Id == global::Android.Resource.Id.Content || ReferenceEquals(parent, _parent.Target))
{
return;
}
_parent = ToolkitExtensions.GetWeakReferenceOrDefault(parent, Empty.WeakReference, false);
Raise(view, EventArgs.Empty);
}
private ParentObserver(View view)
{
_view = ServiceProvider.WeakReferenceFactory(view);
_parent = ToolkitExtensions.GetWeakReferenceOrDefault(GetParent(view), Empty.WeakReference, false);
}
private ParentObserver(Element view)
{
_view = ServiceProvider.WeakReferenceFactory(view);
_parent = ToolkitExtensions.GetWeakReferenceOrDefault(FindParent(view), Empty.WeakReference, false);
view.PropertyChanged += OnPropertyChanged;
}