我有一个具有属性的类(TMyClass)(Items:TItems)
TItems = class;
TMyClass = class(TComponent)
private
FItems: TItems;
procedure SetItems(const Value: TItems);
protected
public
protected
property Items: TItems read FItems write SetItems;
end.
TExItems = class(TItems)
private
FNewProb: Integer;
protected
public
published
property NewProp: Integer read FNewProb write FNewProb;
end.
TExMyClass = class(TMyClass)
private
FItems: TExItems;
procedure SetItems(const Value: TItems);
protected
public
published
property Items: TExItems read FItems write SetItems;
end.
新的“ Items”属性是从TItems继承的,但是当我安装组件时,并未出现TExItems的“ NewProb”新属性,并且看起来“ Items”属性仍然是TItems而不是TExItems ...如何覆盖它?
谢谢
修改 :
这是真实的代码
类型
TKHAdvSmoothDock =类;
TKHAdvSmoothDockItem = class(TAdvSmoothDockItem)
private
FImageIndex: TImageIndex;
procedure SetImageIndex(const Value: TImageIndex);
protected
public
published
property ImageIndex: TImageIndex read FImageIndex write SetImageIndex default -1;
end;
TKHAdvSmoothDockItems = class(TAdvSmoothDockItems)
private
FOwner: TKHAdvSmoothDock;
FOnChange: TNotifyEvent;
function GetItem(Index: Integer): TKHAdvSmoothDockItem;
procedure SetItem(Index: Integer; const Value: TKHAdvSmoothDockItem);
protected
function GetOwner: TPersistent; override;
public
constructor Create(AOwner: TKHAdvSmoothDock);
function Add: TKHAdvSmoothDockItem;
function Insert(Index: Integer): TKHAdvSmoothDockItem;
property Items[Index: Integer]: TKHAdvSmoothDockItem read GetItem write SetItem; default;
procedure Delete(Index: Integer);
published
property OnChange: TNotifyEvent read FOnChange write FOnChange;
end;
TKHAdvSmoothDock = class(TAdvSmoothDock)
private
FImageChangeLink: TChangeLink;
FImages: TCustomImageList;
FItems: TKHAdvSmoothDockItems;
procedure ImageListChange(Sender: TObject);
procedure SetImages(const Value: TCustomImageList);
procedure SetItems(const Value: TKHAdvSmoothDockItems);
function GetItems: TKHAdvSmoothDockItems;
{ Private declarations }
protected
procedure UpdateImagesFromImageList;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
published
property Images: TCustomImageList read FImages write SetImages;
property Items: TKHAdvSmoothDockItems read GetItems write SetItems;
end;
问候。
最佳答案
属性获取器和设置器可以是虚拟的,然后被继承的类覆盖,请参见下面的示例更新。示例代码有一个警告,那就是您试图更改属性的类型,这是不允许的。我建议您在Value is TExItems
中检查TExMyClass.SetItems
,但要使用继承的Items属性,并在TExMyClass
的所有方法和其他继承者中强制转换为TExItems。
TItems = class;
TMyClass = class(TComponent)
private
FItems: TItems;
procedure SetItems(const Value: TItems); virtual;
protected
property Items: TItems read FItems write SetItems;
end;
TExItems = class(TItems)
private
FNewProb: Integer;
protected
public
published
property NewProp: Integer read FNewProb write FNewProb;
end;
TExMyClass = class(TMyClass)
private
procedure SetItems(const Value: TItems); override;
end;