Listbox with colored lines

Colored lines in listbox are more user-friendly and easy to read. Here is how to do it…

 

First of all, place ListBox component on a form and set Style property to lbOwnerDrawFixed. The rest is simple:

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, StdCtrls;
 
type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure ListBox1DrawItem(Control: TWinControl; Index: Integer; 

              Rect: TRect; State: TOwnerDrawState);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  ListBox1.Style := lbOwnerDrawFixed;
end;
 
procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer; 

                 Rect: TRect; State: TOwnerDrawState);
begin
with Control as TListBox do
begin
  Canvas.FillRect(Rect);
  Canvas.Font.Color := TColor(Items.Objects[Index]);
  Canvas.TextOut(Rect.Left + 2, Rect.Top, Items[Index]);
end;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
 ListBox1.Items.AddObject('Red line', Pointer(clRed));
 ListBox1.Items.AddObject('Green line', Pointer(clGreen));
end;
 
end.