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COMPONENT HIERARCHY

Posted on 2002-05-22
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COMPONENT HIERARCHY

How to know component hierarchy ?

For example : TLabel
-----
TObject
TPersistent
TComponent
TControl
TWidgetControl
TFrameControl
TCustomLabel
TLabel
-----

Thanks.
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Question by:cvbmn
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kretzschmar earned 1400 total points
ID: 7028233
from the delphi help file:

This example shows how to obtain the ancestry of a component using the ClassType and ClassParent properties.  It uses a button and a list box on a form. When the user clicks the button, the name of the button’s class and the names of its parent classes are added to the list box.

procedure TForm1.Button1Click(Sender: TObject);

var
  ClassRef: TClass;
begin
  ListBox1.Clear;
  ClassRef := Sender.ClassType;
  while ClassRef <> nil do
  begin
    ListBox1.Items.Add(ClassRef.ClassName);
    ClassRef := ClassRef.ClassParent;
  end;

end;

The list box contains the following strings after the user clicks the button:

TButton
     TButtonControl
     TWinControl
     TControl
     TComponent
     TPersistent
     TObject

meikl ;-)
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