/// <inheritdoc/>
Task <bool> IConductor.ActivateItemAsync(object item)
{
// Explicit interface implementation because this method is not really async.
ActivateItem(item);
return(TaskHelper.FromResult(true));
}
/// <inheritdoc/>
public Task <bool> DeactivateItemAsync(object item, bool close)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
if (!item.Equals(Item))
{
throw new ArgumentException("Item is not controlled by this conductor.", nameof(item));
}
// This method might be called by the view model to close or hide the view.
if (close)
{
var tcs = new TaskCompletionSource <bool>();
// ReSharper disable AccessToModifiedClosure
ClosingEventHandler closingHandler = null;
ClosedEventHandler closedHandler = null;
closingHandler = (s, e) =>
{
if (e.Cancel)
{
_view.Closing -= closingHandler;
_view.Closed -= closedHandler;
tcs.TrySetResult(false);
}
};
closedHandler = (s, e) =>
{
_view.Closing -= closingHandler;
_view.Closed -= closedHandler;
tcs.TrySetResult(true);
};
_view.Closing += closingHandler;
_view.Closed += closedHandler;
// ReSharper restore AccessToModifiedClosure
_view.Close();
return(tcs.Task);
}
#if SILVERLIGHT || WINDOWS_PHONE
throw new InvalidOperationException("Temporarily hiding a window or dialog in Silverlight is not supported.");
#else
_view.Hide();
(_viewModel as IActivatable)?.OnDeactivate(false);
return(TaskHelper.FromResult(true));
#endif
}
/// <inheritdoc/>
public override Task <bool> CanCloseAsync()
{
var guardClose = Item as IGuardClose;
return((guardClose != null) ? guardClose.CanCloseAsync() : TaskHelper.FromResult(true));
}
/// <inheritdoc/>
public virtual Task <bool> CanCloseAsync()
{
return(TaskHelper.FromResult(true));
}