public override ITypeDescriptor GetChildDataContextType(ITypeDescriptor dataContext, IDataContextStack controlContextStack, IAbstractControl control, IPropertyDescriptor property = null)
{
IPropertyDescriptor controlProperty;
if (!control.Metadata.TryGetProperty(PropertyName, out controlProperty))
{
throw new Exception($"The property '{PropertyName}' was not found on control '{control.Metadata.Type}'!");
}
IAbstractPropertySetter setter;
if (control.TryGetProperty(controlProperty, out setter))
{
var binding = setter as IAbstractPropertyBinding;
if (binding == null)
{
return(dataContext);
}
return(binding.Binding.ResultType);
}
else
{
if (AllowMissingProperty)
{
return(dataContext);
}
else
{
throw new Exception($"Property '{PropertyName}' is required on '{control.Metadata.Type.Name}'.");
}
}
}
public static IAbstractPropertySetter GetPropertyGroupMember(this IAbstractControl control, string prefix, string memberName)
{
IAbstractPropertySetter value;
control.TryGetProperty(control.Metadata.GetPropertyGroupMember(prefix, memberName), out value);
return(value);
}
public override ITypeDescriptor GetChildDataContextType(ITypeDescriptor dataContext, IDataContextStack controlContextStack, IAbstractControl control, IPropertyDescriptor property = null)
{
if (!control.Metadata.TryGetProperty(PropertyName, out var controlProperty))
{
throw new Exception($"The property '{PropertyName}' was not found on control '{control.Metadata.Type}'!");
}
if (control.TryGetProperty(controlProperty, out var setter) && setter is IAbstractPropertyBinding binding)
{
return(binding.Binding.ResultType);
}
return(controlProperty.PropertyType);
}
/// <summary>
/// Gets the data context change behavior for the specified control property.
/// </summary>
protected virtual IDataContextStack GetDataContextChange(IDataContextStack dataContext, IAbstractControl control, IPropertyDescriptor property)
{
if (dataContext == null)
{
return(null);
}
var manipulationAttribute = property != null ? property.DataContextManipulationAttribute : control.Metadata.DataContextManipulationAttribute;
if (manipulationAttribute != null)
{
return(manipulationAttribute.ChangeStackForChildren(dataContext, control, property, (parent, changeType) => CreateDataContextTypeStack(changeType, parentDataContextStack: parent)));
}
var attributes = property != null ? property.DataContextChangeAttributes : control.Metadata.DataContextChangeAttributes;
if (attributes == null || attributes.Length == 0)
{
return(dataContext);
}
try
{
var(type, extensionParameters) = ApplyContextChange(dataContext, attributes, control, property);
if (type == null)
{
return(dataContext);
}
else
{
return(CreateDataContextTypeStack(type, parentDataContextStack: dataContext, extensionParameters: extensionParameters.ToArray()));
}
}
catch (Exception exception)
{
var node = property != null && control.TryGetProperty(property, out var v) ? v.DothtmlNode : control.DothtmlNode;
node?.AddError($"Could not compute the type of DataContext: {exception}");
return(CreateDataContextTypeStack(null, parentDataContextStack: dataContext));
}
}
public override ITypeDescriptor?GetChildDataContextType(ITypeDescriptor dataContext, IDataContextStack controlContextStack, IAbstractControl control, IPropertyDescriptor?property = null)
{
if (!control.Metadata.TryGetProperty(PropertyName, out var controlProperty))
{
throw new Exception($"The property '{PropertyName}' was not found on control '{control.Metadata.Type}'!");
}
if (control.TryGetProperty(controlProperty, out var setter))
{
return(setter is IAbstractPropertyBinding binding
? binding.Binding.ResultType ?? throw new Exception($"The '{controlProperty.Name}' property contains invalid data-binding")
: dataContext);
}
if (AllowMissingProperty)
{
return(dataContext);
}
throw new Exception($"Property '{PropertyName}' is required on '{control.Metadata.Type.Name}'.");
}
public override ITypeDescriptor GetChildDataContextType(ITypeDescriptor dataContext, IDataContextStack controlContextStack, IAbstractControl control, IPropertyDescriptor property = null)
{
IPropertyDescriptor controlProperty;
if (!control.Metadata.TryGetProperty(PropertyName, out controlProperty))
{
throw new Exception($"The property '{PropertyName}' was not found on control '{control.Metadata.Type}'!");
}
IAbstractPropertySetter setter;
if (control.TryGetProperty(controlProperty, out setter))
{
var binding = setter as IAbstractPropertyBinding;
if (binding == null)
{
return dataContext;
}
return binding.Binding.ResultType;
}
else
{
if (AllowMissingProperty) return dataContext;
else throw new Exception($"Property '{PropertyName}' is required on '{control.Metadata.Type.Name}'.");
}
}
public static bool HasPropertyValue(this IAbstractControl control, IPropertyDescriptor property)
{
IAbstractPropertySetter setter;
return(control.TryGetProperty(property, out setter) && setter is IAbstractPropertyValue);
}
=> control.Content.All(c => !DothtmlNodeHelper.IsNotEmpty(c.DothtmlNode)); // allow only whitespace literals
public static bool HasProperty(this IAbstractControl control, IPropertyDescriptor property)
{
IAbstractPropertySetter blackHole;
return(control.TryGetProperty(property, out blackHole));
}