public IEnumerable <ISourceValue> EnumerateFields()
{
/*
* var current = this;
* while (true)
* {
* yield return current;
* if (!(current.Source is UnknownFieldValueSource unknownFieldValueSource))
* {
* break;
* }
*
* current = unknownFieldValueSource;
* }
*/
ISourceValue current = this;
while (current != null)
{
yield return(current);
current = current is UnknownFieldValueSource unknownFieldValueSource
? unknownFieldValueSource.Source
: null;
}
}
static ObserverBase()
{
CollectionChangedEvent = typeof(INotifyCollectionChanged).GetEventEx("CollectionChanged", MemberFlags.Instance | MemberFlags.Public);
ValueChangedEvent = typeof(ISourceValue).GetEventEx("ValueChanged", MemberFlags.Instance | MemberFlags.Public);
DisposedException = ExceptionManager.ObjectDisposed(typeof(ObserverBase));
EmptyDisposable = new ActionToken(() => { });
EmptySource = new BindingResourceObject(null);
}
public XamlResourceWrapper(object target, string key, IBindingMemberInfo rootMember, ISourceValue globalResource)
{
_key = key;
_value = BindingConstants.UnsetValue;
_reference = ServiceProvider.WeakReferenceFactory(target);
_unsubscriber = rootMember.TryObserve(target, this);
_globalResource = globalResource;
}
public XamlResourceWrapper(object target, string key, IBindingMemberInfo rootMember, ISourceValue globalResource)
{
_key = key;
_value = BindingConstants.UnsetValue;
_reference = ServiceProvider.WeakReferenceFactory(target);
_unsubscriber = rootMember.TryObserve(target, this);
_globalResource = globalResource;
}
private void OnValueChanged(ISourceValue sender, EventArgs args)
{
var handler = ValueChanged;
if (handler != null)
{
handler(this, args);
}
}
public virtual void AddObject(string name, ISourceValue obj, bool rewrite)
{
Should.NotBeNullOrWhitespace(name, nameof(name));
Should.NotBeNull(obj, nameof(obj));
DynamicResourceObject value;
lock (_objects)
{
if (!_objects.TryGetValue(name, out value))
{
value = new DynamicResourceObject();
_objects[name] = value;
}
}
value.SetValue(obj, name, rewrite);
}
public void SetValue(ISourceValue value, string name, bool rewrite)
{
var oldValue = _value;
if (oldValue != null)
{
if (!rewrite)
{
throw ExceptionManager.ObjectInitialized("resource", oldValue.Value, "Name - " + name);
}
oldValue.ValueChanged -= OnValueChanged;
}
_value = value;
if (value != null)
{
value.ValueChanged += OnValueChanged;
}
OnValueChanged(null, EventArgs.Empty);
}
public virtual void AddObject(string name, ISourceValue obj, bool rewrite)
{
Should.NotBeNullOrWhitespace(name, nameof(name));
Should.NotBeNull(obj, nameof(obj));
DynamicResourceObject value;
lock (_objects)
{
if (!_objects.TryGetValue(name, out value))
{
value = new DynamicResourceObject();
_objects[name] = value;
}
}
value.SetValue(obj, name, rewrite);
}
private void OnValueChanged(ISourceValue sender, EventArgs args)
{
ValueChanged?.Invoke(this, args);
}
public void SetValue(ISourceValue value, string name, bool rewrite)
{
var oldValue = _value;
if (oldValue != null)
{
if (!rewrite)
throw ExceptionManager.ObjectInitialized("resource", oldValue.Value, "Name - " + name);
oldValue.ValueChanged -= OnValueChanged;
}
_value = value;
if (value != null)
value.ValueChanged += OnValueChanged;
OnValueChanged(null, EventArgs.Empty);
}
private void OnValueChanged(ISourceValue sender, EventArgs args)
{
var handler = ValueChanged;
if (handler != null)
handler(this, args);
}
private void OnValueChanged(ISourceValue sender, EventArgs args)
{
ValueChanged?.Invoke(this, args);
}
private static void BindingContextChanged(ISourceValue value, EventArgs args)
{
var context = (IBindingContext)value;
UpdataContext(null, context.Source as View, context);
}
public UnknownFieldValueSource(ISourceValue source, string name)
{
Source = source;
Name = name;
}
/// <summary>
/// Adds the specified object.
/// </summary>
public virtual void AddObject(string name, ISourceValue obj, bool rewrite)
{
Should.NotBeNullOrWhitespace(name, "name");
Should.NotBeNull(obj, "obj");
lock (_objects)
{
DynamicResourceObject value;
if (!_objects.TryGetValue(name, out value))
{
value = new DynamicResourceObject();
_objects[name] = value;
}
value.SetValue(obj, name, rewrite);
}
lock (_instanceObjects)
{
for (int i = 0; i < _instanceObjects.Count; i++)
{
var resourceObject = (DynamicResourceObject)_instanceObjects[i].Target;
if (resourceObject == null)
{
_instanceObjects.RemoveAt(i);
--i;
}
else
resourceObject.OnResourceAdded(obj, name);
}
}
}
public void OnResourceAdded(ISourceValue value, string name)
{
if (_name == name)
SetValue(value, name, true);
}
