更改DBGrid 颜色技巧

 1、根据条件更改某一单元格的颜色
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procedure TMainFrm.First_DGDrawColumnCell(Sender: TObject;
  const Rect: TRect; DataCol: Integer; Column: TColumn;
  State: TGridDrawState);
begin
  if DM.FirstListStatus.AsString='生产' then begin
     First_DG.Canvas.Font.Color:=clGreen
   end
  else begin
     First_DG.Canvas.Font.Color:=clRed;
  end;
  if DataCol = 4 then
     First_DG.DefaultDrawColumnCell(Rect,DataCol,Column,State);
end;  

2、多种改变方式

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<span style="color:#000000;">procedure TMainForm.DBGrid1DrawColumnCell(Sender: TObject;
  const Rect: TRect; DataCol: Integer; Column: TColumn;State: TGridDrawState);
var i :integer;
begin
  if gdSelected in State then Exit;
//定义表头的字体和背景颜色：
    for i :=0 to (Sender as TDBGrid).Columns.Count-1 do
    begin
      (Sender as TDBGrid).Columns[i].Title.Font.Name :='宋体'; //字体
      (Sender as TDBGrid).Columns[i].Title.Font.Size :=9; //字体大小
      (Sender as TDBGrid).Columns[i].Title.Font.Color :=$000000ff; //字体颜色(红色)
      (Sender as TDBGrid).Columns[i].Title.Color :=$0000ff00; //背景色(绿色)
    end;
//隔行改变网格背景色：
  if Query1.RecNo mod 2 = 0 then
    (Sender as TDBGrid).Canvas.Brush.Color := clInfoBk //定义背景颜色
  else
    (Sender as TDBGrid).Canvas.Brush.Color := RGB(191, 255, 223); //定义背景颜色
//定义网格线的颜色：
DBGrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);
  with (Sender as TDBGrid).Canvas do //画 cell 的边框
  begin
    Pen.Color := $00ff0000; //定义画笔颜色(蓝色)
    MoveTo(Rect.Left, Rect.Bottom); //画笔定位
    LineTo(Rect.Right, Rect.Bottom); //画蓝色的横线
    Pen.Color := $0000ff00; //定义画笔颜色(绿色)
    MoveTo(Rect.Right, Rect.Top); //画笔定位
    LineTo(Rect.Right, Rect.Bottom); //画绿色的竖线
  end;
end;</span>  

3、纵向斑马线效果：实现网格的奇数列和偶数列分别以不同的颜色显示以区别相邻的数据列。

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Case DataCol Mod 2 = 0 of
  True: DbGrid1.Canvas.Brush.Color:= clBlue; file://偶数列用蓝色
 False: DbGrid1.Canvas.Brush.Color:= clAqua; file://奇数列用浅绿色
End;
DbGrid1.Canvas.Pen.Mode:=pmMask;
DBGrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);
4、纵向斑马线，同时以红色突出显示当前单元格效果：以突出显示当前选中的字段。

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Case DataCol Mod 2 = 0 of
True: DbGrid1.Canvas.Brush.Color:= clBlue; file://偶数列用蓝色
False: DbGrid1.Canvas.Brush.Color:= clAqua; file://奇数列用浅绿色
End;
If ((State = [gdSelected]) or (State=[gdSelectedgdFocused])) then
If Not DbGrid1.SelectedRows.CurrentRowSelected then
DbGrid1.Canvas.Brush.Color:=clRed; file://当前选中单元格显示红色
DbGrid1.Canvas.Pen.Mode:=pmMask;
DBGrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);
5、在数据网格中以红色突出显示当前选中的行。
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设置DbGrid控件的Options属性中的dgRowSelect属性为真，Color属性为clAqua(背景色)
在DbGrid的DrawColumnCell事件中编写如下代码：  

if ((State = [gdSelected]) or (State=[gdSelected gdFocused])) then
DbGrid1.Canvas.Brush.color:=clRed; file://当前行以红色显示，其它行使用背景的浅绿色
DbGrid1.Canvas.pen.mode:=pmmask;
DBGrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);  

6、行突显的斑马线效果：既突出当前行，又区分不同的列（字段）。
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if ((State = [gdSelected]) or (State=[gdSelectedgdFocused])) then
begin
Case DataCol Mod 2 = 0 of
True : DbGrid1.Canvas.Brush.color:=clRed; file://当前选中行的偶数列显示红色
False: DbGrid1.Canvas.Brush.color:=clblue; file://当前选中行的奇数列显示蓝色
end;
DbGrid1.Canvas.pen.mode:=pmmask;
DBGrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);  

7、横向斑马线， 同时以红色突显当前行效果。
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Case Table1.RecNo mod 2 = 0 of file://根据数据集的记录号进行判断
True : DbGrid1.Canvas.Brush.color:=clAqua; file://偶数行用浅绿色显示
False: DbGrid1.Canvas.Brush.color:=clblue; file://奇数行用蓝色表示
end;
if ((State = [gdSelected]) or (State=[gdSelectedgdFocused])) then file://选中行用红色显示
DbGrid1.Canvas.Brush.color:=clRed;
DbGrid1.Canvas.pen.mode:=pmMask;
DBGrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);  

8、双向斑马线效果：即行间用不同色区分，同时，选中行以纵向斑马线效果区分不同的列。
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Case Table1.RecNo mod 2 = 0 of file://根据数据集的记录号进行判断
True : DbGrid1.Canvas.Brush.color:=clAqua; file://偶数行用浅绿色显示
False: DbGrid1.Canvas.Brush.color:= clblue; file://奇数行用蓝色表示
end;
If ((State = [gdSelected]) or (State=[gdSelectedgdFocused])) then
Case DataCol mod 2 = 0 of
True : DbGrid1.Canvas.Brush.color:=clRed; file://当前选中行的偶数列用红色
False: DbGrid1.Canvas.Brush.color:= clGreen; file://当前选中行的奇数列用绿色表示
end;
DbGrid1.Canvas.pen.mode:=pmMask;
DBGrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);