public Connector(IDataSource dataSource, ICommandSink command)
{
_dataSource = dataSource;
_commandSink = command;
_dataSource.DataUpdated += OnDataUpdated;
}
static void OnCommandSinkChanged(DependencyObject depObj, DependencyPropertyChangedEventArgs e)
{
ICommandSink commandSink = e.NewValue as ICommandSink;
if (!ConfigureDelayedProcessing(depObj, commandSink))
{
ProcessCommandSinkChanged(depObj, commandSink);
}
}
static void ProcessCommandSinkChanged(DependencyObject depObj, ICommandSink commandSink)
{
CommandBindingCollection cmdBindings = GetCommandBindings(depObj);
if (cmdBindings == null)
{
throw new ArgumentException("The CommandSinkBinding.CommandSink attached property was set on an element that does not support CommandBindings.");
}
foreach (CommandBinding cmdBinding in cmdBindings)
{
CommandSinkBinding csb = cmdBinding as CommandSinkBinding;
if (csb != null && csb.CommandSink == null)
{
csb.CommandSink = commandSink;
}
}
}
// This method is necessary when the CommandSink attached property is set on an element
// in a template, or any other situation in which the element's CommandBindings have not
// yet had a chance to be created and added to its CommandBindings collection.
static bool ConfigureDelayedProcessing(DependencyObject depObj, ICommandSink commandSink)
{
bool isDelayed = false;
CommonElement elem = new CommonElement(depObj);
if (elem.IsValid && !elem.IsLoaded)
{
RoutedEventHandler handler = null;
handler = delegate
{
elem.Loaded -= handler;
ProcessCommandSinkChanged(depObj, commandSink);
};
elem.Loaded += handler;
isDelayed = true;
}
return isDelayed;
}
// This method is necessary when the CommandSink attached property is set on an element
// in a template, or any other situation in which the element's CommandBindings have not
// yet had a chance to be created and added to its CommandBindings collection.
static bool ConfigureDelayedProcessing(DependencyObject depObj, ICommandSink commandSink)
{
bool isDelayed = false;
CommonElement elem = new CommonElement(depObj);
if (elem.IsValid && !elem.IsLoaded)
{
RoutedEventHandler handler = null;
handler = delegate
{
elem.Loaded -= handler;
ProcessCommandSinkChanged(depObj, commandSink);
};
elem.Loaded += handler;
isDelayed = true;
}
return(isDelayed);
}
public static void SetCommandSink(DependencyObject obj, ICommandSink value)
{
obj.SetValue(CommandSinkProperty, value);
}
public static void SetCommandSink(DependencyObject obj, ICommandSink value)
{
obj.SetValue(CommandSinkProperty, value);
}
static void ProcessCommandSinkChanged(DependencyObject depObj, ICommandSink commandSink)
{
CommandBindingCollection cmdBindings = GetCommandBindings(depObj);
if (cmdBindings == null)
throw new ArgumentException("The CommandSinkBinding.CommandSink attached property was set on an element that does not support CommandBindings.");
foreach (CommandBinding cmdBinding in cmdBindings)
{
CommandSinkBinding csb = cmdBinding as CommandSinkBinding;
if (csb != null && csb.CommandSink == null)
csb.CommandSink = commandSink;
}
}
public WhenConnectingDataSourceAndCommandSink()
{
_dataSource = A.Fake <IDataSource>();
_commandSink = A.Fake <ICommandSink>();
_connector = new Connector(_dataSource, _commandSink);
}
