winfrom的两种拖拽方式和界面阴影

方式1

private Point mouseOffset; //记录鼠标指针的坐标

        private bool isMouseDown = false; //记录鼠标按键是否按下

        private void Form1_MouseDown(object sender, MouseEventArgs e)

        {

            int xOffset;

            int yOffset;

            if (e.Button == MouseButtons.Left)

            {

                xOffset = -e.X - SystemInformation.FrameBorderSize.Width;

                yOffset = -e.Y - SystemInformation.CaptionHeight -

                SystemInformation.FrameBorderSize.Height;

                mouseOffset = new Point(xOffset, yOffset);

                isMouseDown = true;

            }

        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)

        {

            if (isMouseDown)

            {

                Point mousePos = Control.MousePosition;

                mousePos.Offset(mouseOffset.X, mouseOffset.Y);

                Location = mousePos;

            }

        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)

        {

            // 修改鼠标状态isMouseDown的值

            // 确保只有鼠标左键按下并移动时，才移动窗体

            if (e.Button == MouseButtons.Left)

            {

                isMouseDown = false;

            }

        }

方式2利用API

//窗体移动API

[DllImport("user32.dll")]

public static extern bool ReleaseCapture();

[DllImport("user32.dll")]

public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int IParam);

public const int WM_SYSCOMMAND = 0x0112;

public const int SC_MOVE = 0xF010;

public const int HTCAPTION = 0x0002;

[DllImport("user32")]

private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, IntPtr lParam);

private const int WM_SETREDRAW = 0xB;

private void Form1_MouseDown(object sender, MouseEventArgs e)

{

    if (this.WindowState == FormWindowState.Normal)

    {

        ReleaseCapture();

        SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);

    }

}

 

 //窗体阴影API

        const int CS_DropSHADOW = 0x20000;

        const int GCL_STYLE = (-26);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]

        public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]

        public static extern int GetClassLong(IntPtr hwnd, int nIndex);

        public Form1()

        {

            InitializeComponent();

            SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW);

        }