/// <summary>
/// Clone the object as a means of caching the current values to allow changes to be reverted on 'Cancel'
/// </summary>
public Album Clone()
{
// Assumes this is a flat, data model object
int ticks = (int)DateTime.Now.Ticks * -1; // hack to get a fairly unique integer; the clone isn't going to get saved so this shouldn't matter
Album newInstance = new Album(ticks);
CopyValues(this, newInstance);
return newInstance;
}
// This stuff could move to a IRevertable interface and/or a DataModelBase class that derives from PropertyChangedBase
public static void CopyValues(Album from, Album to)
{
// Use reflection to shuttle the property values from source to destination Album instances
Type type = from.GetType();
System.Reflection.PropertyInfo[] allProperties = type.GetProperties();
foreach (System.Reflection.PropertyInfo property in allProperties)
{
if (property.CanWrite) //TODO: this could be made more flexible by honoring a custom 'DoNotCopy' attribute
{
property.SetValue(to, property.GetValue(from, null), null);
}
}
}
public void DoCancel()
{
if (_isNew)
{
DoDelete();
}
else
{
Album.CopyValues(_originalValues, SelectedAlbum); // revert to original values
_originalValues = null;
}
SelectedAlbum = null;
IsEditMode = false;
_isNew = false;
}
public void DoSave()
{
int i = SelectedAlbum.ID;
// the actual save to local folder of json files
JsonRepository<Album> repo = new JsonRepository<Album>();
repo.Save(SelectedAlbum);
SelectedAlbum = null;
IsEditMode = false;
_originalValues = null;
_isNew = false;
}
public void DoAddNew()
{
int nextId = Albums.OrderBy(a => a.ID).Last().ID + 1;
// TODO: if using repo:
// JsonRepository<Album> repo = new JsonRepository<Album>();
// int nextId2 = repo.GetNextId();
Album newAlbum = new Album(nextId) {Title = "(new)"};
Albums.Add(newAlbum);
SelectedAlbum = newAlbum;
_isNew = true;
IsEditMode = true;
RefreshActionGuards();
}
