恢复 TDBGrid 中的水平滚动位置

发布于 2024-08-12 23:46:22 字数 1130 浏览 9 评论 0原文

我编写了一个简单的方法来对 TDBGrid 中的列进行排序。如果 Option.RowSelect 设置为 False，则一切正常，但如果 RowSelect 为 True，则水平位置滚动在排序列后不会恢复。所以我尝试 GetScrollPos 和 SetScrollPos 来恢复水平滚动位置，ScrollBar 转到正确的位置，但 TDBGrid 没有滚动，方法如下：

procedure TDBGrid.TitleClick(Column: TColumn);
var
  CurrenctPosition: TBookmark;
  PosScroll: Integer;
begin
  inherited TitleClick(Column);
  if FAllowTitleClick and (Assigned(DataSource))
  and (Assigned(DataSource.DataSet))
  and (DataSource.DataSet.Active)
  and (Assigned(Column.Field))
  and (Column.Field.FieldKind <> fkLookup) then
  begin
    //Get position scroll
    PosScroll := GetScrollPos(Handle, SB_HORZ);
    CurrenctPosition := DataSource.DataSet.GetBookmark;
    FPaintInfo.ColPressed := False;
    FPaintInfo.ColPressedIdx := -1;
    if ValidCell(FCell) then
      InvalidateCell(FCell.X, FCell.Y);
    SortColumn(Column);
    DataSource.DataSet.GotoBookmark(CurrenctPosition);
    //Set position scroll
    SetScrollPos(Handle, SB_HORZ, PosScroll, True);//<- need to be refreshed
  end;
end;

这可能可以使用循环中的 Perform(WM_HSCROLL, SB_LINERIGHT, 0) 来修复，但不是好主意。有人有更好的解决方案吗？

原文

I wrote a simple method to sort column in TDBGrid.
If Option.RowSelect set to False everything works fine, but if RowSelect gets True the horizontal position scroll doesn't restore after sort column.
So I try GetScrollPos and SetScrollPos to restore horizontal Scroll position, the ScrollBar goes to the right position but TDBGrid didn't scroll, here is the method:

procedure TDBGrid.TitleClick(Column: TColumn);
var
  CurrenctPosition: TBookmark;
  PosScroll: Integer;
begin
  inherited TitleClick(Column);
  if FAllowTitleClick and (Assigned(DataSource))
  and (Assigned(DataSource.DataSet))
  and (DataSource.DataSet.Active)
  and (Assigned(Column.Field))
  and (Column.Field.FieldKind <> fkLookup) then
  begin
    //Get position scroll
    PosScroll := GetScrollPos(Handle, SB_HORZ);
    CurrenctPosition := DataSource.DataSet.GetBookmark;
    FPaintInfo.ColPressed := False;
    FPaintInfo.ColPressedIdx := -1;
    if ValidCell(FCell) then
      InvalidateCell(FCell.X, FCell.Y);
    SortColumn(Column);
    DataSource.DataSet.GotoBookmark(CurrenctPosition);
    //Set position scroll
    SetScrollPos(Handle, SB_HORZ, PosScroll, True);//<- need to be refreshed
  end;
end;

This can maybe fixed using Perform(WM_HSCROLL, SB_LINERIGHT, 0) in loop but isn't good idea.
Anybody have better solution?

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韵柒 2024-08-19 23:46:22

这是控制最左边一列的方法：

type
  TGridFriend=class(TDBGrid);


procedure TForm1.Button2Click(Sender: TObject);
begin
  // scroll to right by one column
  TGridFriend(DBGrid1).leftCol:=TGridFriend(DBGrid1).leftCol + 1;
end;

here's a way to control what is the leftmost column:

type
  TGridFriend=class(TDBGrid);


procedure TForm1.Button2Click(Sender: TObject);
begin
  // scroll to right by one column
  TGridFriend(DBGrid1).leftCol:=TGridFriend(DBGrid1).leftCol + 1;
end;

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