Devart Forums

Posted: **Thu 23 Oct 2014 13:49**

Hello.

I've created my own TVirtualTable descendant, where I need to "redefine" MasterFields and DetailFields properties, among others.

These are published in TVirtualTable and defined in TMemDataSet as protected.

So I redefined them in my descendant /as published/ including my own setters and getters for both.

But their setters and getters didn't work in Object Inspector. After filling any value in design-time, the field was filled back to empty string after click to other property.

So I decided to add one more class, just to hide both properties (state them as private).

So my code looks as follows:

Code: Select all

  
  TCustomVirtualTable = class(TVirtualTable)
  private
    property MasterFields; // Hide published
    property DetailFields; // Hide published
  end;

  TMyVirtualTable = class(TCustomVirtualTable)
  private
    function GetMasterFields: String;
    function GetDetailFields: String;
    procedure SetMasterFields(Value: String);
    procedure SetDetailFields(Value: String);
  published
    { Redefine Hidden Properties }
    property MasterFields: String read GetMasterFields write SetMasterFields;
    property DetailFields: String read GetDetailFields write SetDetailFields;
  end;

It is working now, but still I can see special property editor for both in Object Inspector.

So is this the right way to redefine/mask published properties and how can I get rid of these editors ?

Thank you for your help.

Posted: **Thu 23 Oct 2014 22:34**

What I've found, editor type for this two properties is TLinkFields ("Field Link Designer"), the standard Delphi property editor. But I can't see it anywhere in the source (no RegisterPropertyEditor, etc.). The only place where I see something similar is dcldac200.bpl, the phrase "DADataSetMasterFieldsEditor", so probably the registration is out there, but only compiled, without source.

Posted: **Fri 24 Oct 2014 08:42**

Hello,

To replace the Maser/Detail field editor, you should register new editors in the Register method of your component, for example:

Code: Select all

procedure Register;
begin
  RegisterComponents('Samples', [TMyVirtualTable]);
  RegisterPropertyEditor(TypeInfo(string), TMyVirtualTable, 'MasterFields', TStringProperty);
  RegisterPropertyEditor(TypeInfo(string), TMyVirtualTable, 'DetailFields', TStringProperty);
end;

When using TStringProperty - the property in the object inspector will be a simple string.

Posted: **Fri 24 Oct 2014 12:51**

Thank you Alex, exactly what I was looking for!

Posted: **Mon 27 Oct 2014 05:31**

You are welcome. Feel free to contact us if you have any further questions.

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