mouse_unit.pas

一系列DELPHI的控件如何使用的例子,例子有的比较简单,但是能详细的说明了控件的使用,对许多刚涉足DELPHI的朋友会很有帮助的

unit mouse_Unit;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    GroupBox1: TGroupBox;
    procedure GroupBox1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure GroupBox1MouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure GroupBox1MouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  private
    opos:tpoint;    //记录原始位置
    cpos:tpoint;    //记录当前位置
    dpos:tpoint;  //记录鼠标按下时位置
    mlbd:boolean;   //标记鼠标左键是否按下
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.GroupBox1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
   opos.X:=GroupBox1.Left;    //记录原始坐标位置
   opos.Y:=GroupBox1.Top;
   dpos.X:=x;                 //鼠标按下位置
   dpos.Y:=y;
   dpos:=clienttoscreen(dpos);
   if button=mbleft then
      mlbd:=true;
end;

procedure TForm1.GroupBox1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
   if mlbd then
   begin
   cpos.X:=x;
   cpos.Y:=y;
   cpos:=clienttoscreen(cpos);
   GroupBox1.Left:=opos.X+(cpos.X-dpos.X);
   GroupBox1.Top:=opos.y+(cpos.y-dpos.y);
   end;
end;

procedure TForm1.GroupBox1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
   mlbd:=false;
end;

end.