表單或控制項的兩種拖動方式

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第一種

音量大小的樣本

#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;//設定拖動時滑鼠箭頭            if (e.Button == MouseButtons.Left)            {                Point mousePos = Control.MousePosition;                mousePos.Offset(mouse_offset.X, mouse_offset.Y);//設定位移                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

第二種

命名空間   using System.Runtime.InteropServices;

#region 表單拖動
        [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

 

兩種方式 都可以實現表單和控制項的拖動

第二種方式更適合表單拖動