法国小费一般给多少:combobox 自绘

来源:百度文库 编辑:偶看新闻 时间:2024/04/28 12:30:57
代码文件:
unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls, ImgList, ComCtrls;type  TForm1 = class(TForm)    ComboBox1: TComboBox;    ImageList1: TImageList;    procedure FormCreate(Sender: TObject);    procedure ComboBox1DrawItem(Control: TWinControl; Index: Integer;      Rect: TRect; State: TOwnerDrawState);    procedure FormDestroy(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}var  Bits: array[0..3] of TBitmap;procedure TForm1.FormCreate(Sender: TObject);var  i: Integer;begin  for i := 0 to Length(Bits)-1 do  begin    Bits[i] := TBitmap.Create;    ImageList1.GetBitmap(i, Bits[i]);    ComboBox1.Items.Add(Format('Item %d', [i]));  end;  ComboBox1.Style := csOwnerDrawVariable;  ComboBox1.ItemHeight := Bits[0].Height + 4;  ComboBox1.ItemIndex := 0;end;procedure TForm1.ComboBox1DrawItem(Control: TWinControl; Index: Integer;  Rect: TRect; State: TOwnerDrawState);begin  ComboBox1.Canvas.FillRect(Rect);  ComboBox1.Canvas.BrushCopy(Bounds(Rect.Left+2, Rect.Top+2, Bits[Index].Width, Bits[Index].Height),                              Bits[Index],                             Bounds(0, 0, Bits[Index].Width, Bits[Index].Height),                             clBlack);  ComboBox1.Canvas.TextOut(Rect.Left + 24, Rect.Top + 3, ComboBox1.Items[Index]);end;procedure TForm1.FormDestroy(Sender: TObject);var  i: Integer;begin  for i := 0 to Length(Bits)-1 do    Bits[i].Free;end;end.