Mega Code Archive
Tcheckbox inside a trichedit
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Question
With my collegues, we tried to implement a checkbox object into Rich Edit.
Is that possible anyway?
Answer
This seems not possible from within the IDE/ Object Inspector. However, if you create the checkbox instance dynammically (at run-time), then it works as expected.
For the following example, create a new form, drop a TRichEdit on it and create the checkbox in the FormCreate() event.
The button event handler code moves the RichEdit control at run-time around to demonstrate that the checkbox really is its child.
unit fMain;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ComCtrls;
type
TForm1 = class(TForm)
RichEdit1: TRichEdit;
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ private declarations }
public
{ public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
begin
RichEdit1.Left := 100-RichEdit1.Left;
end;
procedure TForm1.FormCreate(Sender: TObject);
var
cb: TCheckBox;
begin
RichEdit1.Left := 20;
cb := TCheckBox.Create(RichEdit1);
// do not forget to set the
cb.Parent := RichEdit1;
cb.Left := 30;
cb.Top := 30;
cb.Caption := 'my checkbox';
end;
end.
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