Delphi Combobox ItemHeight Custom?!

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs,
  StdCtrls;
 
const
  UM_MEASUREFONTS = WM_USER;
type
  TForm1 = class(TForm)
    ComboBox1: TComboBox;
    procedure FormCreate(Sender: TObject);
    procedure ComboBox1MeasureItem(Control: TWinControl; Index:
Integer;
      var Height: Integer);
    procedure ComboBox1DrawItem(Control: TWinControl; Index: Integer;
      Rect: TRect; State: TOwnerDrawState);
  private
    { Private declarations }
    Procedure UMMeasureFonts( Var msg: TMessage ); message
UM_MEASUREFONTS;
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.DFM}
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  combobox1.Items := Screen.Fonts;
  combobox1.itemindex := 0;
  // Measure items after form has been shown
  PostMessage( handle, UM_MEASUREFONTS, 0, 0 );
end;
 
procedure TForm1.ComboBox1MeasureItem(Control: TWinControl; Index:
Integer;
  var Height: Integer);
begin
  // Is called too early to be of use, trying to use the controls
canvas
  // to measure items fails since the control is not visible yet.
  // Return design-time size + some extra spacing.
  Height := (Control As TCombobox).ItemHeight+4;
end;
 
procedure TForm1.ComboBox1DrawItem(Control: TWinControl; Index:
Integer;
  Rect: TRect; State: TOwnerDrawState);
var
  cb: TCombobox;
begin
  cb:= Control As TCombobox;
  cb.Canvas.FillRect( rect );
  If (index >= 0) and (index < cb.Items.Count) Then Begin
    If odComboBoxEdit In State Then Begin
      // Draw the edit portion of the control, use the controls
      // design-time font for this since the edit control is
      // fixed height and drawing a bunch of symbols if the selected
      // font is Symbol etc. is not very informative for the user.
      cb.Canvas.Font := cb.Font;
      If odSelected In State Then
       cb.Canvas.Font.Color := clHighlightText;
    End
    Else Begin
      cb.Canvas.Font.Name := cb.Items[index];
      cb.Canvas.Font.Size := 10;
    End;
    cb.Canvas.TextRect( Rect, rect.left+2, rect.top+2, cb.Items[index]
);
  End;
end;
 
procedure TForm1.UMMeasureFonts(var msg: TMessage);
var
  i: Integer;
begin
  // use form canvas for measurements
  canvas.font.size := 10;
  For i := 0 To combobox1.items.count - 1 Do Begin
    canvas.font.name := combobox1.items[i];
    combobox1.perform( CB_SETITEMHEIGHT,
                       i,
                       canvas.TextHeight(combobox1.items[i]));
  End; { For }
 
end;
 
end.

                                              

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