using System;

using System.Windows.Forms;

 

 

class form_move

{

    Form f1;

    bool beginMove = false;

    int currentXPosition = 0;

    int currentYPosition = 0;

    public form_move(Form f)

    {

        f1 = f;

        f.MouseDown += new MouseEventHandler(f_MouseDown);

        f.MouseMove += new MouseEventHandler(f_MouseMove);

        f.MouseUp += new MouseEventHandler(f_MouseUp);

        f.MouseLeave += new EventHandler(f_MouseLeave);

    }

 

    void f_MouseMove(object sender, MouseEventArgs e)

    {

        if (beginMove == true)

        {

            f1.Left += Control.MousePosition.X - currentXPosition;

            f1.Top += Control.MousePosition.Y - currentYPosition;

 

            currentXPosition = Control.MousePosition.X;

            currentYPosition = Control.MousePosition.Y;

        }

    }

 

    void f_MouseLeave(object sender, EventArgs e)

    {

        currentXPosition = 0;

        currentYPosition = 0;

    }

 

    void f_MouseUp(object sender, MouseEventArgs e)

    {

        beginMove = false;

       

    }

 

    void f_MouseDown(object sender, MouseEventArgs e)

    {

        beginMove = true;

        currentXPosition = Control.MousePosition.X;//或直接用e.X;

        currentYPosition = Control.MousePosition.Y;

    }

 

  

}