是否更改特定Checklistbox项的字体或颜色？

Question

我正在使用Delphi XE-3。我希望更改复选列表框中单个项目的颜色或字体。这个是可能的吗？

Answer 1

您将需要对复选列表框使用所有者描述。将复选列表框的Style属性设置为lbOwnerDrawFixed，并编写OnDrawItem事件的处理程序。在此事件处理程序中，您可以使用类似以下内容：

procedure TForm1.CheckListBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
var
  Flags: Longint;
begin
  with (Control as TCheckListBox) do
  begin
    // modifying the Canvas.Brush.Color here will adjust the item color
    case Index of
      0: Canvas.Brush.Color := $00F9F9F9;
      1: Canvas.Brush.Color := $00EFEFEF;
      2: Canvas.Brush.Color := $00E5E5E5;
    end;
    Canvas.FillRect(Rect);
    // modifying the Canvas.Font.Color here will adjust the item font color
    case Index of
      0: Canvas.Font.Color := clRed;
      1: Canvas.Font.Color := clGreen;
      2: Canvas.Font.Color := clBlue;
    end;
    Flags := DrawTextBiDiModeFlags(DT_SINGLELINE or DT_VCENTER or DT_NOPREFIX);
    if not UseRightToLeftAlignment then
      Inc(Rect.Left, 2)
    else
      Dec(Rect.Right, 2);
    DrawText(Canvas.Handle, Items[Index], Length(Items[Index]), Rect, Flags);
  end;
end;

下面是上面例子的结果：

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