private static void OnNetworkTableChange(ITable table, string key, Value v, NotifyFlags flags)
{
try
{
//multiple objects could be bound to this key
foreach (INotifyPropertyChanged source in propertyLookup.Keys)
{
OneToOneConversionMap <string, string> conversionMap = propertyLookup[source];
ITable boundTable = customTables[source];
object bindingSource = (source is DependencyNotifyListener) ? (object)(source as DependencyNotifyListener).source : source;
if (table.ToString() != boundTable.ToString())
{
continue;
}
if (conversionMap.TryGetBySecond(key, out string property))
{
//the property that changed is bound to this object
//grab the converter and use it if needed
IValueConverter converter = conversionMap.GetConverterByFirst(property);
PropertyInfo inf = bindingSource.GetType().GetProperty(property);
//issue using v for some reason
object value = NetworkUtil.ReadValue(boundTable.GetValue(key, null));
if (converter != null)
{
//in an NTConverter (required in API) the null values are never used so we don't need to set them
object attemptedVal = converter.ConvertBack(value, null, null, null);
//in case the conversion was invalid
if (attemptedVal != DependencyProperty.UnsetValue)
{
value = attemptedVal;
}
}
//correct any type inconsistencies (eg if we want to display an integer from the network, which only stores doubles)
if (value != null && value.GetType() != inf.PropertyType)
{
Type targetType = inf.PropertyType;
if (targetType.IsGenericType && targetType.GetGenericTypeDefinition() == typeof(Nullable <>))
{
targetType = targetType.GetGenericArguments()[0];
}
//anything still here can make an invalid cast to let them know to use a converter
value = Convert.ChangeType(value, targetType);
}
//write to the object
assignmentDispatch.Invoke(() => inf.SetValue(bindingSource, value));
}
}
}
catch (InvalidOperationException e)
{
if (!e.Message.StartsWith("Collection was modified"))
{
throw e;
}
}
}
/// <summary>
/// Creates a binding between a dependency property and a network table entry
/// </summary>
/// <typeparam name="TLocal">The type of the entry in the dashboard</typeparam>
/// <typeparam name="TNetwork">The type of the entry in the network table</typeparam>
/// <param name="source">The object to bind to</param>
/// <param name="property">The property to bind. Attached properties will throw an exception</param>
/// <param name="networkPath">The full path of the entry in the network table</param>
/// <param name="converter">The conversion mapping between the network values and local values</param>
/// <param name="localOverride">Whether the local dashboard values should take precedence when the binding occurs</param>
public static void Create <TLocal, TNetwork>(DependencyObject source, DependencyProperty property, string networkPath,
NTConverter <TLocal, TNetwork> converter, bool localOverride = false)
{
if (!IsRunning)
{
throw new InvalidOperationException("Can only create bindings while the network table is running");
}
Tuple <ITable, string> networkSource = NormalizeKey(networkPath);
networkPath = networkSource.Item2;
//because of additional work that needs to be done to bind the value, simpler to reimplement
DependencyNotifyListener listener = new DependencyNotifyListener(source);
if (!propertyLookup.ContainsKey(listener))
{
propertyLookup[listener] = new OneToOneConversionMap <string, string>();
//this is a new item being bound, have it notify us of updates
listener.PropertyChanged += OnLocalValueChange;
}
if (propertyLookup[listener].TryAdd(property.Name, networkPath))
{
customTables[listener] = networkSource.Item1;
//this means there were no binding conflicts
//bind the dependency property to be notified of changes to it
listener.BindProperty(property);
//map a conversion if needed; null is valid
propertyLookup[listener].MapConversionByFirst(property.Name, converter);
//make the values consistent by forcing an update.
//first check if the dashboard has a value at all
Value data = networkSource.Item1.GetValue(networkPath, null);
if (data == null || localOverride)
{
//send the local value to the network by "updating" the local value
PropertyChangedEventArgs e = new PropertyChangedEventArgs(property.Name);
OnLocalValueChange(listener, e);
}
else
{
//pull the dashboard from the local value by "updating" the network value
OnNetworkTableChange(networkSource.Item1, networkPath, data, NotifyFlags.NotifyUpdate);
}
}
}
/// <summary>
/// Creates a binding between an observable object property and a network table entry of a different type
/// </summary>
/// <typeparam name="TLocal">The type of the entry in the dashboard</typeparam>
/// <typeparam name="TNetwork">The type of the entry in the network table</typeparam>
/// <param name="source">The object to bind to</param>
/// <param name="property">The case-sensitive name of the property to bind</param>
/// <param name="networkPath">The full path of the entry in the network table</param>
/// <param name="converter">The conversion mapping between the network values and local values</param>
/// <param name="localOverride">Whether the local dashboard values should take precedence when the binding occurs</param>
public static void Create <TLocal, TNetwork>(INotifyPropertyChanged source, string property, string networkPath,
NTConverter <TLocal, TNetwork> converter, bool localOverride = false)
{
if (!IsRunning)
{
throw new InvalidOperationException("Can only create bindings while the network table is running");
}
Tuple <ITable, string> networkSource = NormalizeKey(networkPath);
networkPath = networkSource.Item2;
//add these to our dictionary
if (!propertyLookup.ContainsKey(source))
{
propertyLookup[source] = new OneToOneConversionMap <string, string>();
//this is a new item being bound; have it notify us of updates
source.PropertyChanged += OnLocalValueChange;
}
if (propertyLookup[source].TryAdd(property, networkPath))
{
customTables[source] = networkSource.Item1;
//this means there were no binding conflicts
//map a conversion if needed; null is a valid argument
propertyLookup[source].MapConversionByFirst(property, converter);
//make the values consistent by forcing an update.
//first check if the dashboard has a value at all
object data = networkSource.Item1.GetValue(networkPath, null);
if (data == null || localOverride)
{
//send the local value to the network by "updating" the local value
PropertyChangedEventArgs e = new PropertyChangedEventArgs(property);
OnLocalValueChange(source, e);
}
else
{
//pull the dashboard from the local value by "updating" the network value
OnNetworkTableChange(networkSource.Item1, networkPath, Value.MakeValue(data), NotifyFlags.NotifyUpdate);
}
}
}
private static void OnLocalValueChange(object sender, PropertyChangedEventArgs e)
{
INotifyPropertyChanged obj = sender as INotifyPropertyChanged;
OneToOneConversionMap <string, string> map = propertyLookup[obj];
ITable boundTable = customTables[obj];
object bindingSource = (obj is DependencyNotifyListener) ? (object)(obj as DependencyNotifyListener).source : obj;
//first, verify that the property that changed is bound to something
if (map.TryGetByFirst(e.PropertyName, out string networkPath))
{
//grab the converter and use it if needed
IValueConverter converter = map.GetConverterByFirst(e.PropertyName);
PropertyInfo inf = bindingSource.GetType().GetProperty(e.PropertyName);
object value = inf.GetValue(bindingSource);
if (converter != null)
{
//in an NTConverter (required in API) the null values are never used so we don't need to set them
object attemptedVal = converter.Convert(value, null, null, null);
//in case the conversion was invalid
if (attemptedVal != DependencyProperty.UnsetValue)
{
value = attemptedVal;
}
}
//apparently network table STRONGLY dislikes null values
if (value != null)
{
//write to the dashboard
Value data = Value.MakeValue(value);
boundTable.PutValue(networkPath, data);
//the network table doesn't know any better and won't try to notify us of this change
//therefore, bindings won't be updated again, so we should initiate a network table update
//this is ok, because we only write to network table on effective value changes
OnNetworkTableChange(boundTable, networkPath, data, NotifyFlags.NotifyUpdate);
}
}
}
