Mega Code Archive
Clone a Control with all its Childcontrols
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Title: Clone a Control with all its Childcontrols
Question: How can I Clone a Control-Component with all of its Childcontrols
Answer:
unit Unit1; //Clone a Control with all its Childcontrols
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, Buttons, ExtCtrls, ComCtrls;
type
TForm1 = class(TForm)
Panel1: TPanel;
ComboBox1: TComboBox;
Edit1: TEdit;
BitBtn_CloneComtrolWithItsChildcontrols: TBitBtn;
StatusBar1: TStatusBar;
procedure BitBtn_CloneComtrolWithItsChildcontrolsClick(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.BitBtn_CloneComtrolWithItsChildcontrolsClick(Sender: TObject);
function CloneComponent(AAncestor: TComponent): TComponent;
var
XMemoryStream: TMemoryStream;
XTempName: string;
begin
Result:=nil;
if not Assigned(AAncestor) then
exit;
XMemoryStream:=TMemoryStream.Create;
try
XTempName:=AAncestor.Name;
AAncestor.Name:='clone_' + XTempName;
XMemoryStream.WriteComponent(AAncestor);
AAncestor.Name:=XTempName;
XMemoryStream.Position:=0;
Result:=TComponentClass(AAncestor.ClassType).Create(AAncestor.Owner);
if AAncestor is TControl then TControl(Result).Parent:=TControl(AAncestor).Parent;
XMemoryStream.ReadComponent(Result);
finally
XMemoryStream.Free;
end;
end;
var
aPanel: TPanel;
Ctrl, Ctrl_: TComponent;
i: integer;
begin
//handle the Control (here Panel1) itself first
TComponent(aPanel) := CloneComponent(Panel1);
with aPanel do
begin
Left := 5;
Top := 8;
end;
//now handle the childcontrols
for i:= 0 to Panel1.ControlCount-1 do begin
Ctrl := TComponent(Panel1.Controls[i]);
Ctrl_ := CloneComponent(Ctrl);
TControl(Ctrl_).Parent := aPanel;
TControl(Ctrl_).Left := TControl(Ctrl).Left;
TControl(Ctrl_).top := TControl(Ctrl).top;
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin //make StatusBar1, BitBtn its parentcontrol
BitBtn_CloneComtrolWithItsChildcontrols.Parent :=
StatusBar1;
BitBtn_CloneComtrolWithItsChildcontrols.Left := 2;
BitBtn_CloneComtrolWithItsChildcontrols.Top := 2;
end;
end.
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