如何使用 TStringGrid 呈现大量的颜色信息 - 回复 "冷公子" 的问题

"冷公子" 同学需要在 TStringGrid 中通过颜色显示大量信息, 给出的方案是: 建立一个对应的颜色数组.

参考代码:

---

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, StdCtrls;

type
  TForm1 = class(TForm)
    StringGrid1: TStringGrid;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer; Rect: TRect; State: TGridDrawState);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

const
  ColNum = 6;             //列数
  RowNum = 5;             //行数
  ColorDefault = clWhite; //默认颜色
  
var
  colorArray: array of array of TColor; //颜色数组

procedure TForm1.FormCreate(Sender: TObject);
var
  i,j: Integer;
begin
  {初始化颜色数组}
  SetLength(colorArray, ColNum, RowNum);
  for i := 0 to ColNum - 1 do 
    for j := 0 to RowNum - 1 do
      colorArray[i,j] := ColorDefault;

  {初始化 StringGrid}
  StringGrid1.ColCount := ColNum + 1;
  StringGrid1.RowCount := RowNum + 1;
  for i := 1 to StringGrid1.ColCount - 1 do
    StringGrid1.Cells[i, 0] := Format('Col%d', [i]);
  for i := 1 to StringGrid1.RowCount - 1 do
    StringGrid1.Cells[0, i] := Format('Row%d', [i]);
end;

{StringGrid1 的 OnDrawCell 事件: 绘制颜色}
procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer; Rect: TRect;
  State: TGridDrawState);
begin
  if Length(colorArray) < 1 then Exit;
  if (ACol = 0) or (ARow = 0) then Exit;
  if colorArray[ACol-1, ARow-1] = ColorDefault then Exit;
  
  with TStringGrid(Sender).Canvas do begin
    Brush.Color := colorArray[ACol-1, ARow-1];
    FillRect(Rect);
  end;
end;

{颜色呈现测试}
procedure TForm1.Button1Click(Sender: TObject);
begin
  colorArray[1,2] := clRed;
  colorArray[1,3] := clBlue;
  StringGrid1.Refresh;
end;

end.

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