sigh,
下面是Delphi5.0的帮助中的例子,我一点也没改动
Here is a typical handler for an OnDrawItem event. In the example, a list box
with the lbOwnerDrawFixed style draws a bitmap to the left of each string.
procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
Rect:TRect;State: TOwnerDrawState);
var
Bitmap: TBitmap; { temporary variable for the item抯 bitmap }
Offset: Integer; { text offset width }
begin
with (Control as TListBox).Canvas do { draw on control canvas, not on the form }
begin
FillRect(Rect); { clear the rectangle }
Offset := 2; { provide default offset }
Bitmap := TBitmap((Control as TListBox).Items.Objects[Index]); { get the bitmap }
if Bitmap <> nil then
begin
BrushCopy(Bounds(Rect.Left + 2, Rect.Top, Bitmap.Width, Bitmap.Height),
Bitmap, Bounds(0, 0, Bitmap.Width, Bitmap.Height), clRed); {render bitmap}
Offset := Bitmap.width + 6; { add four pixels between bitmap and text}
end;
TextOut(Rect.Left + Offset, Rect.Top, (Control as TListBox).Items[Index]) { display the text }
end;
end;
要使其生效,需先设置listBox的style为lbOwnerDrawFixed