delphi – 有没有更简单的方法来定义基于布尔值的枚举类型？

从我到目前为止看到的情况来看,人们通常会对具有Is或Has前缀的基本访问权限的属性进行前缀.在您的情况下,我将遵循此规则并创建一个名为HasIDECompatibility的属性,或者说IsIDECompatible.此属性将为布尔类型,并且将具有一个getter,通过该getter可以返回元素是否在内部set字段内的信息.在setter中,它将根据输入值将元素包含或排除到集合中.

在更通用的代码中,它将是：

type
  TElement = (
    Element1,Element2,Element3
  );
  TElements = set of TElement;

  TMyClass = class
  private
    FElements: TElements;
    function GetElement(Kind: TElement): Boolean;
    procedure SetElement(Kind: TElement; Value: Boolean);
  public
    // this property is for direct access to the set field; if your class would
    // be a TComponent descendant and you'd publish this property,you'd see it
    // in the Object Inspector represented by a set of check boxes
    property Elements: TElements read FElements write FElements;
    // this property is just a helper for array like access to the internal set
    // field
    property HasElement[Kind: TElement]: Boolean read GetElement write SetElement;
  end;

implementation

{ TMyClass }

function TMyClass.GetElement(Kind: TElement): Boolean;
begin
  Result := Kind in FElements;
end;

procedure TMyClass.SetElement(Kind: TElement; Value: Boolean);
begin
  if Value then
    Include(FElements,Kind)
  else
    Exclude(FElements,Kind);
end;

并举例说明：

procedure TForm1.Button1Click(Sender: TObject);
var
  MyClass: TMyClass;
begin
  MyClass := TMyClass.Create;
  try
    // write elementary property value
    MyClass.HasElement[Element1] := CheckBox1.Checked;
    MyClass.HasElement[Element2] := CheckBox2.Checked;
    // read elementary property value
    CheckBox3.Checked := MyClass.HasElement[Element1];
    CheckBox4.Checked := MyClass.HasElement[Element2];

    // or you can access MyClass.Elements set at once as you were used to do
    // which gives you two ways to include or exclude elements to the set
  finally
    MyClass.Free;
  end;
end;