窗体或控件的两种拖动方式

第一种

音量调节的示例

#region 音量控制
        private Point mouse_offset;
        private void pictureBox7_MouseDown(object sender, MouseEventArgs e)
        {
            mouse_offset = new Point(-e.X, -e.Y);//
        }

        private void pictureBox7_MouseMove(object sender, MouseEventArgs e)
        {
            ((Control)sender).Cursor = Cursors.Arrow;//设置拖动时鼠标箭头
            if (e.Button == MouseButtons.Left)
            {
                Point mousePos = Control.MousePosition;//屏幕坐标
                mousePos.Offset(mouse_offset.X, mouse_offset.Y);//设置偏移
                mousePos.Y = PointToScreen(pictureBox7.Location).Y; 
                Point mouse_New = ((Control)sender).Parent.PointToClient(mousePos);
                if (mouse_New.X < panel1.Location.X )
                {
                    mouse_New.X = panel1.Location.X;
                }
                if (mouse_New.X > panel1.Width + panel1.Location.X)
                {
                    mouse_New.X = panel1.Width+ panel1.Location.X ;
                }
                ((Control)sender).Location = mouse_New;

                panel2.Width = mouse_New.X-panel1.Location.X;
            }
        }
        #endregion

当然这种方法也可用在窗口拖动。

第二种

命名空间   using System.Runtime.InteropServices;

#region 窗体拖动
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        /// <summary>
        /// pa_top事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void pa_top_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, 0x0112, 0xF012, 0);
        }
        #endregion

两种方式 都可以实现窗体和控件的拖动。

第二种方式适合窗体拖动。不过第二种方法和最大化功能配合使用，会出现问题。目前正在解决。如果有人知道 还望相告