8

我有一个 TDBGrid。它有效，但显示的列非常大。

如何设置“自动修复列宽”？

4

6 回答 6

11

所需的 Columnwidth 取决于 Grids 画布的设置和每个字段的显示文本的最小长度。 

procedure FitGrid(Grid: TDBGrid);
const
  C_Add=3;
var
  ds: TDataSet;
  bm: TBookmark;
  i: Integer;
  w: Integer;
  a: Array of Integer;
begin
  ds := Grid.DataSource.DataSet;
  if Assigned(ds) then
  begin
    ds.DisableControls;
    bm := ds.GetBookmark;
    try
      ds.First;
      SetLength(a, Grid.Columns.Count);
      while not ds.Eof do
      begin
        for I := 0 to Grid.Columns.Count - 1 do
        begin
          if Assigned(Grid.Columns[i].Field) then
          begin
            w :=  Grid.Canvas.TextWidth(ds.FieldByName(Grid.Columns[i].Field.FieldName).DisplayText);
            if a[i] < w  then
               a[i] := w ;
          end;
        end;
        ds.Next;
      end;
      for I := 0 to Grid.Columns.Count - 1 do
        Grid.Columns[i].Width := a[i] + C_Add;
        ds.GotoBookmark(bm);
    finally
      ds.FreeBookmark(bm);
      ds.EnableControls;
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  FitGrid(DBgrid1)
end;
于 2013-07-07T07:00:12.867 回答
4

对 bummi 的答案进行了细微修改，以确保标题行（第 0 行）不被截断，并且将在每一列上分配多余的空间

procedure FitGrid(Grid: TDBGrid);
const
  C_Add = 3;
var
  ds: TDataSet;
  bm: TBookmark;
  i: Integer;
  w: Integer;
  a: array of Integer;
begin
  ds := Grid.DataSource.DataSet;

  if not Assigned(ds) then
    exit;

  if Grid.Columns.Count = 0 then
    exit;

  ds.DisableControls;
  bm := ds.GetBookmark;
  try
    ds.First;
    SetLength(a, Grid.Columns.Count);
    for i := 0 to Grid.Columns.Count - 1 do
      if Assigned(Grid.Columns[i].Field) then
        a[i] := Grid.Canvas.TextWidth(Grid.Columns[i].FieldName);

    while not ds.Eof do
    begin

      for i := 0 to Grid.Columns.Count - 1 do
      begin
        if not Assigned(Grid.Columns[i].Field) then
          continue;

        w := Grid.Canvas.TextWidth(ds.FieldByName(Grid.Columns[i].Field.FieldName).DisplayText);

        if a[i] < w then
          a[i] := w;
      end;
      ds.Next;
    end;

    w := 0;
    for i := 0 to Grid.Columns.Count - 1 do
    begin
      Grid.Columns[i].Width := a[i] + C_Add;
      inc(w, a[i] + C_Add);
    end;

    w := (Grid.ClientWidth - w - 20) div (Grid.Columns.Count);

    if w > 0 then
      for i := 0 to Grid.Columns.Count - 1 do
        Grid.Columns[i].Width := Grid.Columns[i].Width + w;


    ds.GotoBookmark(bm);
  finally
    ds.FreeBookmark(bm);
    ds.EnableControls;
  end;
end;
于 2015-05-12T06:32:20.753 回答
3

对 bummi 的答案进行了细微修改，以确保标题行（第 0 行）不被截断

procedure FitGrid(Grid: TDBGrid);
const
  C_Add=3;
var
  ds: TDataSet;
  bm: TBookmark;
  i: Integer;
  w: Integer;
  a: Array of Integer;
begin
  ds := Grid.DataSource.DataSet;
  if Assigned(ds) then
  begin
    ds.DisableControls;
    bm := ds.GetBookmark;
    try
      ds.First;
      SetLength(a, Grid.Columns.Count);
      while not ds.Eof do
      begin
        for I := 0 to Grid.Columns.Count - 1 do
        begin
          if Assigned(Grid.Columns[i].Field) then
          begin
            w :=  Grid.Canvas.TextWidth(ds.FieldByName(Grid.Columns[i].Field.FieldName.).DisplayText);
            if a[i] < w  then
               a[i] := w ;
          end;
        end;
        ds.Next;
      end;
      //if fieldwidth is smaller than Row 0 (field names) fix
      for I := 0 to Grid.Columns.Count - 1 do
      begin
        w :=  Grid.Canvas.TextWidth(Grid.Columns[i].Field.FieldName);
        if a[i] < w  then
           a[i] := w ;
      end;

      for I := 0 to Grid.Columns.Count - 1 do
        Grid.Columns[i].Width := a[i] + C_Add;
        ds.GotoBookmark(bm);
    finally
      ds.FreeBookmark(bm);
      ds.EnableControls;
    end;
  end;
end;
于 2013-11-25T09:45:36.673 回答
1

对 bummi、TheSteven 和 Jens 的答案进行了细微修改，以确保标题行（第 0 行）不被截断，并且将在每列上分配多余的空间，并考虑列的可见性。

procedure FitGrid(const Grid: TDBGrid; const CoverWhiteSpace: Boolean = True);
const
  C_Add=3;
var
  DS: TDataSet;
  BM: TBookmark;
  I, W, VisibleColumnsCount: Integer;
  A: array of Integer;
  VisibleColumns: array of TColumn;
begin
  DS := Grid.DataSource.DataSet;
  if Assigned(DS) then
  begin
    VisibleColumnsCount := 0;
    SetLength(VisibleColumns, Grid.Columns.Count);
    for I := 0 to Grid.Columns.Count - 1 do
      if Assigned(Grid.Columns[I].Field) and (Grid.Columns[I].Visible) then
      begin
        VisibleColumns[VisibleColumnsCount] := Grid.Columns[I];
        Inc(VisibleColumnsCount);
      end;
    SetLength(VisibleColumns, VisibleColumnsCount);

    DS.DisableControls;
    BM := DS.GetBookmark;
    try
      DS.First;
      SetLength(A, VisibleColumnsCount);
      while not DS.Eof do
      begin
        for I := 0 to VisibleColumnsCount - 1 do
        begin
            W :=  Grid.Canvas.TextWidth(DS.FieldByName(VisibleColumns[I].Field.FieldName).DisplayText);
            if A[I] < W then
               A[I] := W;
        end;
        DS.Next;
      end;
      //if fieldwidth is smaller than Row 0 (field names) fix
      for I := 0 to VisibleColumnsCount - 1 do
      begin
        W := Grid.Canvas.TextWidth(VisibleColumns[I].Field.FieldName);
        if A[I] < W then
           A[I] := W;
      end;

      W := 0;
      if CoverWhiteSpace then
      begin
        for I := 0 to VisibleColumnsCount - 1 do
          Inc(W, A[I] + C_Add);
        W := (Grid.ClientWidth - W - 20) div VisibleColumnsCount;
        if W < 0 then
          W := 0;
      end;

      for I := 0 to VisibleColumnsCount - 1 do
        VisibleColumns[I].Width := A[I] + C_Add + W;
      DS.GotoBookmark(BM);
    finally
      DS.FreeBookmark(BM);
      DS.EnableControls;
    end;
  end;
end;
于 2017-10-18T11:51:35.267 回答
0

恐怕最后的代码改编不正确。

我宁愿写这样的东西：

 const
  C_Add=20;

//.....

Sup := 0;
      if CoverWhiteSpace then
        sup :=C_Add;

      for I := 0 to VisibleColumnsCount - 1 do
          VisibleColumns[I].Width := A[I] + sup;
      DS.GotoBookmark(BM);
于 2021-01-07T14:03:53.020 回答
0

我在 TDBGrid 的属性中找到了“列”，并打开了新窗口。在该窗口中，我添加了新的 FieldNames - 您只能从 TADOQuery 的 SQL 字符串的结果中选择 columnNames，然后当您单击确切的列时，您可以在所选列的属性中找到“宽度”，因此您可以随意更改它. 这个对我有用。

于 2018-08-24T10:46:08.880 回答