delphi Sender和Tag的用法

var
  Form1:
TForm1;
  SelectedColor:TColor;//clBlack;
//Default
implementation
{$R *.dfm}

procedure TForm1.FormCreate(Sender:
TObject);
begin
   SelectedColor:=clBlack; //Default
end;
//将这些控件全部选中然后使用双击
OnClick事件
//OnClick获得返回值
procedure TForm1.img11Click(Sender:
TObject);
begin
  if TImage(Sender)=img1  then  SelectedColor:=clBlack;
  if TImage(Sender)=img2  then  SelectedColor:=$00002AA5;
  if TImage(Sender)=img3  then  SelectedColor:=$00404000;
  if TImage(Sender)=img4  then  SelectedColor:=$00005500;
  if TImage(Sender)=img5  then  SelectedColor:=$005E0000;
  if TImage(Sender)=img6  then  SelectedColor:=clNavy;
  if TImage(Sender)=img7  then  SelectedColor:=$00993333;
  if TImage(Sender)=img8  then  SelectedColor:=$00282828;
  if TImage(Sender)=img9  then  SelectedColor:=$0000008B;
  if TImage(Sender)=img10
then  SelectedColor:=$002068FF;
  if TImage(Sender)=img11
then  SelectedColor:=$00008B8B;
  if TImage(Sender)=img12
then  SelectedColor:=$00009300;
  if TImage(Sender)=img13
then  SelectedColor:=$008E8E38;
  if TImage(Sender)=img14
then  SelectedColor:=clBlue;
  if TImage(Sender)=img15
then  SelectedColor:=$00996666;
  if TImage(Sender)=img16
then  SelectedColor:=$00666666;
  if TImage(Sender)=img17
then  SelectedColor:=clRed;
  if TImage(Sender)=img18
then  SelectedColor:=$005BADFF;
  if TImage(Sender)=img19
then  SelectedColor:=$0032CD32;
  if TImage(Sender)=img20
then  SelectedColor:=$0071B33C;
  if TImage(Sender)=img21
then  SelectedColor:=$00D4FF7F;
  if TImage(Sender)=img22
then  SelectedColor:=$00FF6633;
  if TImage(Sender)=img23
then  SelectedColor:=clPurple;
  if TImage(Sender)=img24
then  SelectedColor:=$007F7F7F;
  if TImage(Sender)=img25
then  SelectedColor:=clFuchsia;
  if TImage(Sender)=img26
then  SelectedColor:=$0000D7FF;
  if TImage(Sender)=img27
then  SelectedColor:=clYellow;
  if TImage(Sender)=img28
then  SelectedColor:=clLime;
  if TImage(Sender)=img29
then  SelectedColor:=$00D0E040;
  if TImage(Sender)=img30
then  SelectedColor:=$00FFFFC0;
  if TImage(Sender)=img31
then  SelectedColor:=$00663399;
  if TImage(Sender)=img32
then  SelectedColor:=clSilver;
  if TImage(Sender)=img33
then  SelectedColor:=$00CC99FF;
  if TImage(Sender)=img34
then  SelectedColor:=$008CB4D2;
  if TImage(Sender)=img35
then  SelectedColor:=$0099FFFF;
  if TImage(Sender)=img36
then  SelectedColor:=$0098FB98;
  if TImage(Sender)=img37
then  SelectedColor:=$00EEEEAF;
  if TImage(Sender)=img38
then  SelectedColor:=$00FFCC00;
  if TImage(Sender)=img39
then  SelectedColor:=$00FF99CC;
  if TImage(Sender)=img40
then  SelectedColor:=clWhite;

  //Test
  Label1.Color:=SelectedColor;
end;

//OnMouseMove
样式改变
//先手动设置一下
procedure TForm1.img11MouseMove(Sender: TObject;
Shift: TShiftState; X,
  Y: Integer);
begin
  img_frame.Visible:=True;

  img_frame.Visible:=True;
  case TImage(Sender).Tag of
  1:
    begin
      img_frame.Left:=
img1.Left;
      img_frame.Top := img1.Top;
    end;
  2:
    begin
      img_frame.Left:=
img2.Left;
      img_frame.Top := img2.Top;
    end;
  3:
    begin
      img_frame.Left:=
img3.Left;
      img_frame.Top := img3.Top;
    end;
  4:
    begin
      img_frame.Left:=
img4.Left;
      img_frame.Top := img4.Top;
    end;
  5:
    begin
      img_frame.Left:=
img5.Left;
      img_frame.Top := img5.Top;
    end;
  6:
    begin
      img_frame.Left:=
img6.Left;
      img_frame.Top := img6.Top;
    end;
  7:
    begin
      img_frame.Left:=
img7.Left;
      img_frame.Top := img7.Top;
    end;
  8:
    begin
      img_frame.Left:=
img8.Left;
      img_frame.Top := img8.Top;
    end;
  9:
    begin
      img_frame.Left:=
img9.Left;
      img_frame.Top := img9.Top;
    end;
  10:
    begin
      img_frame.Left:=
img10.Left;
      img_frame.Top := img10.Top;
    end;
  11:
    begin
      img_frame.Left:=
img11.Left;
      img_frame.Top := img11.Top;
    end;
  12:
    begin
      img_frame.Left:=
img12.Left;
      img_frame.Top := img12.Top;
    end;
  13:
    begin
      img_frame.Left:=
img13.Left;
      img_frame.Top := img13.Top;
    end;
  14:
    begin
      img_frame.Left:=
img14.Left;
      img_frame.Top := img14.Top;
    end;
  15:
    begin
      img_frame.Left:=
img15.Left;
      img_frame.Top := img15.Top;
    end;
  16:
    begin
      img_frame.Left:=
img16.Left;
      img_frame.Top := img16.Top;
    end;
  17:
    begin
      img_frame.Left:=
img17.Left;
      img_frame.Top := img17.Top;
    end;
  18:
    begin
      img_frame.Left:=
img18.Left;
      img_frame.Top := img18.Top;
    end;
  19:
    begin
      img_frame.Left:=
img19.Left;
      img_frame.Top := img19.Top;
    end;
  20:
    begin
      img_frame.Left:=
img20.Left;
      img_frame.Top := img20.Top;
    end;
  21:
    begin
      img_frame.Left:=
img21.Left;
      img_frame.Top := img21.Top;
    end;
  22:
    begin
      img_frame.Left:=
img22.Left;
      img_frame.Top := img22.Top;
    end;
  23:
    begin
      img_frame.Left:=
img23.Left;
      img_frame.Top := img23.Top;
    end;
  24:
    begin
      img_frame.Left:=
img24.Left;
      img_frame.Top := img24.Top;
    end;
  25:
    begin
      img_frame.Left:=
img25.Left;
      img_frame.Top := img25.Top;
    end;
  26:
    begin
      img_frame.Left:=
img26.Left;
      img_frame.Top := img26.Top;
    end;
  27:
    begin
      img_frame.Left:=
img27.Left;
      img_frame.Top := img27.Top;
    end;
  28:
    begin
      img_frame.Left:=
img28.Left;
      img_frame.Top := img28.Top;
    end;
  29:
    begin
      img_frame.Left:=
img29.Left;
      img_frame.Top := img29.Top;
    end;
  30:
    begin
      img_frame.Left:=
img30.Left;
      img_frame.Top := img30.Top;
    end;
  31:
    begin
      img_frame.Left:=
img31.Left;
      img_frame.Top := img31.Top;
    end;
  32:
    begin
      img_frame.Left:=
img32.Left;
      img_frame.Top := img32.Top;
    end;
  33:
    begin
      img_frame.Left:=
img33.Left;
      img_frame.Top := img33.Top;
    end;
  34:
    begin
      img_frame.Left:=
img34.Left;
      img_frame.Top := img34.Top;
    end;
  35:
    begin
      img_frame.Left:=
img35.Left;
      img_frame.Top := img35.Top;
    end;
  36:
    begin
      img_frame.Left:=
img36.Left;
      img_frame.Top := img36.Top;
    end;
  37:
    begin
      img_frame.Left:=
img37.Left;
      img_frame.Top := img37.Top;
    end;
  38:
    begin
      img_frame.Left:=
img38.Left;
      img_frame.Top := img38.Top;
    end;
  39:
    begin
      img_frame.Left:=
img39.Left;
      img_frame.Top := img39.Top;
    end;
  40:
    begin
      img_frame.Left:=
img40.Left;
      img_frame.Top := img40.Top;
    end;
  end;

end;

来自为知笔记(Wiz)