轻松实现DBGrid的多表头

for i := 0 to Columns.Count - 1 do
begin
Layer := ExtractSubTitle(nil, i);
if Layer > MaxLayer then MaxLayer := Layer;
end;
SaveFont.Assign(Canvas.Font);
Canvas.Font.Assign(TitleFont);
try
GetTextMetrics(Canvas.Handle, TM);
//调整DBGrid的标题行高度
RowHeights[0] := (TM.tmHeight TM.tmInternalLeading 3) * MaxLayer;
finally
Canvas.Font.Assign(SaveFont);
end;
inherited;
end;

function TADBGrid.TitleLayerRect(LayerTitles: TStrings; TitleRect: TRect;
LayerID, ACol: Integer): TRect;
var
SubTitle: string;
i, j: Integer;
bBrer: Boolean;
begin
Result := TitleRect;
if Assigned(Columns[ACol]) then
SubTitle := Columns[ACol].Title.Caption
else Exit;
ExtractSubTitle(LayerTitles, ACol);
//联合左边的兄弟列
for i := ACol - 1 downto 0 do
begin
ExtractSubTitle(BrerLayerTitles, i);
bBrer := False;
//判断是否为兄弟列
if (BrerLayerTitles.Count = LayerTitles.Count) then
begin
for j := 0 to LayerID do
begin
bBrer := BrerLayerTitles[j] = LayerTitles[j];
if not bBrer then
Break;
end;
end;
if bBrer then
begin
Result.Left := Result.Left - Columns[i].Width;
if dgColLines in Options then
Result.Left := Result.Left - 1;
end
else Break;
end;
//联合右边的兄弟列
for i := ACol 1 to Columns.Count - 1 do
begin
ExtractSubTitle(BrerLayerTitles, i);
bBrer := False;
//判断是否为兄弟列
if BrerLayerTitles.Count = LayerTitles.Count then
begin
for j := 0 to LayerID do
begin
bBrer := BrerLayerTitles[j] = LayerTitles[j];
if not bBrer then
Break;
end;
end;
if bBrer then
begin
Result.Right := Result.Right Columns[i].Width;
if dgColLines in Options then
Result.Right := Result.Right 1;
end
else Break;
end;
//调整表头区域
Result.Top := (RowHeights[0] div LayerTitles.Count) * LayerID;
Result.Bottom := (RowHeights[0] div LayerTitles.Count) * (LayerID 1);
end;

end.

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