如何制作自定义组件属性? [英] how to make custom component property?

问题描述

我需要帮助来制作一个控件属性，当您单击它时，它会弹出一个自定义对话框，如设置.就像 TPicture 一样.

I need help to make a control property that when you click on it, it pop-up a custom dialog like settings. just like the TPicture.

有什么想法或建议吗?

推荐答案

如果您的类被用作其他组件的属性，并且您想使用 Object Inspector 来调用您的对话框，那么您必须实现并注册一个自定义属性编辑器，例如:

If your class is used as a property of other components and you want to use the Object Inspector to invoke your dialog, then you have to implement and register a custom Property Editor, eg:

interface

uses
  DesignIntf, DesignEditors;

type
  TMyClassProperty = class(TPropertyEditor)
  public
    procedure Edit; override;
    function GetAttributes: TPropertyAttributes; override;
  end;

procedure Register;

implementation

uses
  MyClassUnit;

procedure TMyClassProperty.Edit;
begin
  with TMyDialog.Create(nil) do
  try
    ShowModal;
  finally
    Free;
  end;
end;

function TMyClassProperty.GetAttributes: TPropertyAttributes;
begin
  Result := inherited GetAttributes + [paDialog];
end;

procedure Register;
begin
  RegisterPropertyEditor(TypeInfo(TMyClass), nil, '', TMyClassProperty);
end;

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