TControl自由移动变化大小 assigned(Panel1.onMouseMoe)判断修改移动事件

procedure ManipulateControl(Control: TControl; Shift: TShiftState; X, Y, Precision: integer);
var
  Form1: TForm1;

implementation

{$R *.dfm}

// 任意改变一个控件 ( 拖动、放大、缩小 )
procedure ManipulateControl(Control: TControl; Shift: TShiftState; X, Y, Precision: integer);
var SC_MANIPULATE: Word;
begin
  if (X<=Precision) and (Y>Precision) and (Y<Control.Height-Precision) then  // 光标在控件的最左侧
    begin
      SC_MANIPULATE  := $F001;
      Control.Cursor := crSizeWE;
    end
  else
  if (X>=Control.Width-Precision) and (Y>Precision) and (Y<Control.Height-Precision) then // 光标在控件的最右侧
    begin
      SC_MANIPULATE  := $F002;
      Control.Cursor := crSizeWE;
    end
  else
  if (X>Precision) and (X<Control.Width-Precision) and (Y<=Precision) then   // 光标在控件的最上侧
    begin
      SC_MANIPULATE  := $F003;
      Control.Cursor := crSizeNS;
    end
  else
  if (X<=Precision) and (Y<=Precision) then // 光标在控件的左上角
    begin
      SC_MANIPULATE  := $F004;
      Control.Cursor := crSizeNWSE;
    end
  else
  if (X>=Control.Width-Precision) and (Y<=Precision) then // 光标在控件的右上角
    begin
      SC_MANIPULATE  := $F005;
      Control.Cursor := crSizeNESW;
    end
  else
  if (X>Precision) and (X<Control.Width-Precision) and (Y>=Control.Height-Precision) then  // 光标在控件的最下侧
    begin
      SC_MANIPULATE  := $F006;
      Control.Cursor := crSizeNS;
    end
  else
  if (X<=Precision) and (Y>=Control.Height-Precision) then // 光标在控件的左下角
    begin
      SC_MANIPULATE  := $F007;
      Control.Cursor := crSizeNESW;
    end
  else
  if (X>=Control.Width-Precision) and (Y>=Control.Height-Precision) then // 光标在控件的右下角
    begin
      SC_MANIPULATE  := $F008;
      Control.Cursor := crSizeNWSE;
    end
  else
  if (X>5) and (Y>5) and (X<Control.Width-5) and (Y<Control.Height-5) then // 光标在控件的客户区 ( 移动整个控件 )
    begin
      SC_MANIPULATE  := $F009;
      Control.Cursor := crSizeAll;
    end
  else
  begin
    SC_MANIPULATE := $F000;
    Control.Cursor := crDefault;
  end;
  if Shift=[ssLeft] then
  begin
    ReleaseCapture;
    Control.Perform(WM_SYSCOMMAND, SC_MANIPULATE, 0);
  end;
end;
procedure TForm1.Panel1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
  ManipulateControl((Sender as TControl), Shift, X, Y, 8);
end;

procedure TForm1.SpeedButton1Click(Sender: TObject);
begin
  if Assigned(Panel1.onMouseMove) then
  begin
    ((Sender as TControl).Parent as TPanel).OnMouseMove:=nil;
    ((Sender as TControl).Parent as TPanel).Cursor:=crDefault;
  end
  else
  begin
    ((Sender as TControl).Parent as TPanel).Cursor:=crSizeAll;
    ((Sender as TControl).Parent as TPanel).OnMouseMove:=Panel1MouseMove;
  end;
end;

TControl自由移动变化大小 assigned(Panel1.onMouseMoe)判断修改移动事件