/// <summary>
/// Copy the value specified by the property name from the source to the haveDisplayName
/// </summary>
/// <param name="haveDisplayName">IHaveDisplayName</param>
/// <param name="eventPattern"></param>
private static void CopyValue(this IHaveDisplayName haveDisplayName, EventPattern <PropertyChangedEventArgs> eventPattern)
{
var source = eventPattern.Sender;
var propertyName = eventPattern.EventArgs.PropertyName;
var value = source.GetType().GetProperty(propertyName)?.GetValue(source) as string;
haveDisplayName.DisplayName = value;
}
private void UpdateDisplayName(IHaveDisplayName item)
{
DisplayName = !string.IsNullOrWhiteSpace(item.DisplayName)
? $"{item.DisplayName} - {WindowTitleBase}"
: WindowTitleBase;
}
/// <summary>
/// Create a binding between the INotifyPropertyChanged and optional IHaveDisplayName objects.
/// </summary>
/// <param name="notifyPropertyChanged">INotifyPropertyChanged</param>
/// <param name="haveDisplayName">optional IHaveDisplayName for the first binding</param>
/// <param name="propertyName">optional property name for the first binding</param>
/// <returns>NameBinding</returns>
public static DisplayNameBinding CreateDisplayNameBinding(this INotifyPropertyChanged notifyPropertyChanged, IHaveDisplayName haveDisplayName = null, string propertyName = null)
{
var propertyChangedObservable = notifyPropertyChanged.OnPropertyChangedPattern();
var nameBinding = new DisplayNameBinding(propertyChangedObservable, notifyPropertyChanged);
if (haveDisplayName != null)
{
nameBinding.AddDisplayNameBinding(haveDisplayName, propertyName);
}
return(nameBinding);
}
/// <summary>
/// Add a displayname binding to the NameBinding
/// </summary>
/// <param name="displayNameBinding">NameBinding to bind to</param>
/// <param name="haveDisplayName">IHaveDisplayName</param>
/// <param name="propertyName">Name of the property in the original INotifyPropertyChanged object</param>
/// <returns>binding</returns>
public static DisplayNameBinding AddDisplayNameBinding(this DisplayNameBinding displayNameBinding, IHaveDisplayName haveDisplayName, string propertyName)
{
if (haveDisplayName == null)
{
throw new ArgumentNullException(nameof(haveDisplayName));
}
if (propertyName == null)
{
throw new ArgumentNullException(nameof(propertyName));
}
var disposable = displayNameBinding.Observable.Where(args => args.EventArgs.PropertyName == propertyName).Subscribe(haveDisplayName.CopyValue);
// Update the display name right away
haveDisplayName.DisplayName = displayNameBinding.NotifyPropertyChanged.GetType().GetProperty(propertyName)?.GetValue(displayNameBinding.NotifyPropertyChanged) as string;
// If the disposables is passed, add the disposable
displayNameBinding.Disposables?.Add(disposable);
return(displayNameBinding);
}
