/// <summary>
/// Encodes a field and accompanying value into a short (16-bit) value
/// </summary>
/// <remarks>
/// Bits 12-15 represent the field. Bits 0-11 represent the value (range between -2048 to 2047)
/// </remarks>
/// <param name="field"></param>
/// <param name="value"></param>
/// <returns></returns>
public static short Encode(CommandFields field, short value)
{
if (value < -2048 || value > 2047)
throw new ArgumentException("Value is outside allowable range (-2048:2047)");
if (value < 0) //sign bit is one (0x0800)
{
return (short)((short)field | 0x0800 | (0x07FF & value));
}
else //sign bit (bit 11) is zero
{
//should be able to simply OR together
return (short)((short)field | value);
}
}
/// <summary>
/// Called for every syntax node in the compilation, we can inspect the nodes and save any information useful for generation
/// </summary>
public void OnVisitSyntaxNode(GeneratorSyntaxContext context)
{
if (context.Node is ClassDeclarationSyntax classDeclaration)
{
INamedTypeSymbol classTypeSymbol = context.SemanticModel.GetDeclaredSymbol(classDeclaration) as INamedTypeSymbol;
if (classTypeSymbol.GetAttributes().Any(ad => ad.AttributeClass.ToDisplayString() == "System.Mvvm.MVVMViewModelAttribute"))
{
ClassTypeSymbol = classTypeSymbol;
var props = classDeclaration.Members.OfType <PropertyDeclarationSyntax>();
ImmutableArray <ISymbol> members = ClassTypeSymbol.GetMembers();
foreach (ISymbol member in members)
{
if (member is IFieldSymbol fieldSymbol)
{
if (fieldSymbol.Type.ToDisplayString() == "System.Mvvm.DelegateCommand")
{
CommandFields.Add(fieldSymbol);
}
}
}
//check to see if any properties are exposed
if (props.Any())
{
var commandFieldnames = new List <string>();
var fieldsToRemove = new List <IFieldSymbol>();
//work through each property
foreach (PropertyDeclarationSyntax propertySyntax in props)
{
IPropertySymbol propertySymbol = context.SemanticModel.GetDeclaredSymbol(propertySyntax);
if (propertySymbol.Type.ToDisplayString() == "System.Windows.Input.ICommand" || (propertySymbol.Type.ToDisplayString() == "System.Mvvm.DelegateCommand"))
{
var propCode = propertySyntax.ToString();
if (CommandFields.Any())
{
foreach (var command in CommandFields)
{
if (propCode.Contains(command.Name))
{
//don't notify the field as its cheaper to call the OnPropertyChanged notification
fieldsToRemove.Add(command);
}
}
}
Properties.Add(propertySymbol);
}
}
//remove removed fields :-)
foreach (var field in fieldsToRemove)
{
CommandFields.Remove(field);
}
}
}
}
}
public FieldValuePair(CommandFields f, short val)
{
if (val < -2048 || val > 2047)
throw new ArgumentException("Value is out of allowable range (-2048:2047)");
this._field = f;
this._value = val;
}
public void SetUp()
{
DatabaseContext = SetupInMemoryDatabase();
DatabaseContext.Database.EnsureCreated();
_commands = new CommandFields(DatabaseContext, Mapper);
}
