数据网格自动适应宽度

数据网格自动适应宽度

///////源代码开始
uses
 Math;

function DBGridRecordSize(mColumn: TColumn): Boolean;
{ 返回记录数据网格列显示最大宽度是否成功 }
begin
 Result := False;
 if not Assigned(mColumn.Field) then Exit;
 mColumn.Field.Tag := Max(mColumn.Field.Tag,
   TDBGrid(mColumn.Grid).Canvas.TextWidth(mColumn.Field.DisplayText));
 Result := True;
end; { DBGridRecordSize }

function DBGridAutoSize(mDBGrid: TDBGrid; mOffset: Integer = 5): Boolean;
{ 返回数据网格自动适应宽度是否成功 }
var
 I: Integer;
begin
 Result := False;
 if not Assigned(mDBGrid) then Exit;
 if not Assigned(mDBGrid.DataSource) then Exit;
 if not Assigned(mDBGrid.DataSource.DataSet) then Exit;
 if not mDBGrid.DataSource.DataSet.Active then Exit;
 for I := 0 to mDBGrid.Columns.Count - 1 do begin
   if not mDBGrid.Columns[I].Visible then Continue;
   if Assigned(mDBGrid.Columns[I].Field) then
     mDBGrid.Columns[I].Width := Max(mDBGrid.Columns[I].Field.Tag,
       mDBGrid.Canvas.TextWidth(mDBGrid.Columns[I].Title.Caption)) + mOffset
   else mDBGrid.Columns[I].Width :=
     mDBGrid.Canvas.TextWidth(mDBGrid.Columns[I].Title.Caption) + mOffset;
   mDBGrid.Refresh;
 end;
 Result := True;
end; { DBGridAutoSize }
///////源代码结束

///////使用示例开始
procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
 DataCol: Integer; Column: TColumn; State: TGridDrawState);
begin
 DBGridRecordSize(Column);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
 DBGridAutoSize(DBGrid1);
end;
///////使用示例结束