delphi - 制作 Delphi TPanel 字幕包装

Question

有没有办法将文本包装TPanel.Caption在 Delphi 中（在我的情况下为 Delphi 6）？

Answer 1

恐怕不是默认的。从 TPanel 的源代码中可以看到，文本是由 DrawText()-windows API 绘制的：

procedure TCustomPanel.Paint;
{snip}
begin
  {snip}
  Flags := DT_EXPANDTABS or DT_SINGLELINE or
    VerticalAlignments[FVerticalAlignment] or Alignments[FAlignment];
  Flags := DrawTextBiDiModeFlags(Flags);
  DrawText(Handle, PChar(Caption), -1, Rect, Flags);
end;

您可以派生和覆盖 Paint 方法，也可以只使用标签。

Answer 2

这是实际有效的代码：

const
  Alignments: array[TAlignment] of Longint = (DT_LEFT, DT_RIGHT, DT_CENTER);
  VerticalAlignments: array[TVerticalAlignment] of Longint = (DT_TOP, DT_BOTTOM, DT_VCENTER);
var
  Rect: TRect;

   ... 
    
   if ShowCaption AND (Caption <> '') then
    begin
     Rect := GetClientRect;
     Canvas.Brush.Style := bsClear;
     Canvas.Font := Self.Font;
     Flags := DT_NOPREFIX OR
              DT_WORDBREAK OR
              VerticalAlignments[VerticalAlignment] OR
              Alignments[Alignment];
     Flags := DrawTextBiDiModeFlags(Flags);
     DrawText(Canvas.Handle, PChar(Caption), Length(Caption), Rect, Flags);
    end;