delphi：如何更改字符串网格中单元格的颜色

Question

我想改变delphi中字符串网格中单元格的背景颜色（不是字体）。

只有一个单元格，而不是一行或一列。

我可以吗？

---

RRUZ：您的程序是正确的并且有效，但在我的程序中不起作用。

我的程序：

x 是全局整数数组

procedure TF_avalie_salon.StringGrid1DrawCell(Sender: TObject; ACol,
    ARow: Integer; Rect: TRect; State: TGridDrawState);
    var   S: string;
begin
    S := StringGrid1.Cells[ACol, ARow];
    StringGrid1.Canvas.FillRect(Rect);
    SetTextAlign(StringGrid1.Canvas.Handle, TA_CENTER);
    StringGrid1.Canvas.TextRect(Rect,Rect.Left + (Rect.Right - Rect.Left) div 2, Rect.Top + 2, S);
    if (ARow<>0 )AND(acol<>0)AND(gridclick=true) then
    begin
        try
          gridclick:=false;
          x[acol+((strtoint(Edit_hafte.Text)-1)*7),arow]:=strtoint(StringGrid1.Cells[ACol, ARow]);
        except
          x[acol+((strtoint(Edit_hafte.Text)-1)*7),arow]:=0;
          StringGrid1.Cells[acol,arow]:='0';
          with TStringGrid(Sender) do
          begin
            Canvas.Brush.Color := clGreen;
            Canvas.FillRect(Rect);
            Canvas.TextOut(Rect.Left+2,Rect.Top+2,Cells[ACol, ARow]);
          end;
        end;
    end;
end;

---

当我使用 Canvas.Brush.Color 和以下代码时，Canvas.Brush.Color 不起作用。如果我在下面的代码中处于非活动状态，我可以更改单元格颜色。但我两者都需要。

    S := StringGrid1.Cells[ACol, ARow];
    StringGrid1.Canvas.FillRect(Rect);
    SetTextAlign(StringGrid1.Canvas.Handle, TA_CENTER);
    StringGrid1.Canvas.TextRect(Rect,Rect.Left + (Rect.Right - Rect.Left) div 2, Rect.Top + 2, S);

Answer 1

Rafael 链接包含您需要的所有内容，使用 OnDrawCell 事件是绘制 StrignGrid 单元格的方法。检查此示例，它仅绘制特定单元格的背景。

procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;  Rect: TRect; State: TGridDrawState);
begin
  if (ACol = 3) and (ARow = 2) then
    with TStringGrid(Sender) do
    begin
      //paint the background Green
      Canvas.Brush.Color := clGreen;
      Canvas.FillRect(Rect);
      Canvas.TextOut(Rect.Left+2,Rect.Top+2,Cells[ACol, ARow]);
    end;
end;

Answer 2

我使用了这些代码，翻译成C++。具体有两处注释，那我就贴出代码吧。

1. 在“StringGrid1”中，属性“DefaultDrawing”必须为 FALSE 才能发挥作用。

2. “Canvas”对象必须是完全限定的：即。 StringGrid1->Canvas->Font->Color =clBlack。

代码：

void __fastcall TForm3::StringGrid1DrawCell(TObject *Sender, int ACol, int ARow, TRect &Rect,
      TGridDrawState State)
{
UnicodeString   uStr = "Hello";
int     k, l;
char    cc[100];


if(TRUE)
    {
    if((ACol <= 1) || (ARow <= 1))
        {
        StringGrid1->Canvas->Font->Color = clBlack;
        StringGrid1->Canvas->Brush->Color = clBtnFace;
        if(ACol == 0)
            {
            if(ARow > 1)
                {
                sprintf( cc, " %5.1f", rowLabels[ARow - 2]);
                uStr = cc;
                StringGrid1->Canvas->TextRect( Rect, Rect.left+2, Rect.top+2, uStr);
                StringGrid1->Canvas->FrameRect(Rect);
                }
            }
        if(ARow == 0)
            {
            if(ACol > 1)
                {
                sprintf( cc, " %5.1f", colLabels[ACol - 2]);
                uStr = cc;
                StringGrid1->Canvas->TextRect( Rect, Rect.left+2, Rect.top+2, uStr);
                StringGrid1->Canvas->FrameRect(Rect);
                }
            }
        }
    else
        {
        switch (ACol%2)
            {
            case 0:
                {
                StringGrid1->Canvas->Font->Color = clRed;
                StringGrid1->Canvas->Brush->Color = 0x00E1FFF9;
                break;
                }
            case 1:
                {
                StringGrid1->Canvas->Font->Color = clBlue;
                StringGrid1->Canvas->Brush->Color = 0x00FFEBDF;
                break;
                }
            }
        StringGrid1->Canvas->TextRect( Rect, Rect.left+2, Rect.top+2, uStr);
        StringGrid1->Canvas->FrameRect(Rect);
        }
    }
}

Answer 3

procedure StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
  Rect: TRect; State: TGridDrawState);
var
i:integer;  
begin
  with Sender as TStringGrid do
    begin
        Canvas.FillRect(Rect);
        DrawText (Canvas.Handle,
            PChar(Cells[ACol, ARow]),
            Length(Cells[ACol, ARow]),
            Rect, DT_WORDBREAK or DT_EXPANDTABS or DT_CENTER);
    end;
    for i:=2 to  StringGrid1.RowCount - 1 do
    if StringGrid1.Cells[3,i]='' then
      begin
        StringGrid1.Canvas.Brush.Color:=clRed;
          if ((ACol=3)and(ARow=i)) then
            begin
              StringGrid1.Canvas.FillRect(Rect);

            end;
      end;


end;