delphi - 具有行高变量的 DBGRID

Question

我想在 DBGRID 中显示如下:

想象“网格”如下:

ID - 描述

1 - 网格的第 1 行
2 - 网格线 2
3 - 网格的第 3 行

现在，假设“DESCRIPTION”列的大小已更改，不再出现“GRID”字样；

我也想留下 DBGRID

ID - 描述

1 - 第 1 行
网格
2 -
第2行 网格
3 -
第3行 网格
有没有可能？？

Answer 1

不是您要问的，但可能会有所帮助...我曾经使用此代码在标准 DBGrid 中显示完整的备注字段:

  TMyForm = class(TForm)
    ...
  private
    FormMemoRect: TRect;
    MemoGrid: TDBGrid;
    BMemo: TBitBtn;
    ...

Procedure TMyForm.FormMemoDeactivate(Sender: TObject);
Begin
    (Sender As TForm).Close;
    Sender.Free;
End;

Procedure TMyForm.BMemoClick(Sender: TObject);
Var FormMemo: TForm;
Begin
    MemoGrid.SetFocus;

    FormMemo := TForm.Create(Self);
    With TMemo.Create(FormMemo) Do Begin
        Parent := FormMemo;
        Align := alClient;
        ReadOnly := True;
        WordWrap := True;
        ScrollBars := ssVertical;
        Lines.Text := MemoGrid.DataSource.DataSet.Fields[TComponent(Sender).Tag].AsString;
    End;

    With FormMemo Do Begin
        OnDeactivate := FormMemoDeactivate;
        Left := FormMemoRect.Left;
        Top := FormMemoRect.Top;
        Width := Max(FormMemoRect.Right - FormMemoRect.Left, 300);
        Height := FormMemoRect.Bottom - FormMemoRect.Top;
        BorderStyle := bsNone;

        Show;
    End;
End;

Procedure TMyForm.GrdMemoDrawColumnCell(Sender: TObject; Const Rect: TRect; DataCol: Integer; Column: TColumn; State: TGridDrawState);
Begin
    If (gdFocused In State) Then Begin
        If Column.Field.DataType In [ftBlob, ftMemo] Then Begin
            {Desenha botão para visualização do Memo}
            FormMemoRect.Left := TWinControl(Sender).ClientToScreen(Rect.TopLeft).X;
            FormMemoRect.Right := TWinControl(Sender).ClientToScreen(Rect.BottomRight).X;
            FormMemoRect.Top := TWinControl(Sender).ClientToScreen(Rect.BottomRight).Y;
            FormMemoRect.Bottom := FormMemoRect.Top + 100;

            If Not Assigned(BMemo) Then
                BMemo := TBitBtn.Create(Self);
            BMemo.Parent := TWinControl(Sender).Parent;
            BMemo.Width := 16;
            BMemo.Height := 16;
            BMemo.Caption := '...';
            BMemo.OnClick := BMemoClick;
            BMemo.Tag := Column.Field.Index;
            BMemo.Left := TWinControl(Sender).Left + Rect.Right - BMemo.Width + 1;
            BMemo.Top := TWinControl(Sender).Top + Rect.Top + 2;

            MemoGrid := TDBGrid(Sender);
        End
        Else
            FreeAndNil(BMemo);
    End;
End;

对于 Blob/Memo 字段，您可能还会发现执行一些自定义 GetText 以直接在网格中显示某些内容很有用:

Procedure TMyForm.DataSetMemoGetText(Sender: TField; var Text: String; DisplayText: Boolean);
Begin
    Text := Copy(Sender.AsString, 1, 50);

    If Text <> Sender.AsString Then
        Text := Text + '...';
End;

这就是结果的样子。

PS:抱歉，代码风格不标准。