Screen Saver

/********************************************************
* User screen saver developer can also
* use animate effects for this screen saver
*********************************************************/

using System.Runtime.InteropServices;

using Microsoft.Win32;

namespace Mesoft.Control

{

    public partial class MeScreenSaver : Form

    {

        #region Win32 API functions

        [DllImport("user32.dll")]

        static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll")]

        static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);

        [DllImport("user32.dll", SetLastError = true)]

        static extern int GetWindowLong(IntPtr hWnd, int nIndex);

        [DllImport("user32.dll")]

        static extern bool GetClientRect(IntPtr hWnd, out Rectangle lpRect);

        #endregion

        private Point mouseLocation;

        private bool previewMode = false;

        private Random rand = new Random();

        public MeScreenSaver()

        {

            InitializeComponent();

        }

        public static void ShowScreenSaver()

        {

            foreach (Screen screen in Screen.AllScreens)

            {

                MeScreenSaver screensaver = new MeScreenSaver(screen.Bounds);

                screensaver.Show();

            }

        }

        public MeScreenSaver(Rectangle Bounds)

        {

            InitializeComponent();

            this.Bounds = Bounds;

        }

        public MeScreenSaver(IntPtr PreviewWndHandle)

        {

            InitializeComponent();

            // Set the preview window as the parent of this window

            SetParent(this.Handle, PreviewWndHandle);

            // Make this a child window so it will close when the parent dialog closes

            SetWindowLong(this.Handle, -16, new IntPtr(GetWindowLong(this.Handle, -16) | 0x40000000));

            // Place our window inside the parent

            Rectangle ParentRect;

            GetClientRect(PreviewWndHandle, out ParentRect);

            Size = ParentRect.Size;

            Location = new Point(0, 0);

            // Make text smaller

            txtLabel.Font = new System.Drawing.Font("Arial", 6);

            previewMode = true;

        }

        private void ScreenSaverForm_Load(object sender, EventArgs e)

        {            

            LoadSettings();

            Cursor.Hide();            

            TopMost = true;

            PicBox.Image = Mesoft.Drawing.MeImage.DrawReflection(PicBox.Image, Color.Black);

            moveTimer.Interval = 1000;

            moveTimer.Tick += new EventHandler(moveTimer_Tick);

            moveTimer.Start();

        }

        private void moveTimer_Tick(object sender, System.EventArgs e)

        {

            // Move text to new location

            PicBox.Left = rand.Next(Math.Max(1, Bounds.Width - PicBox.Width));

            PicBox.Top = rand.Next(Math.Max(1, Bounds.Height - PicBox.Height));            

        }

        private void LoadSettings()

        {

            // Use the string from the Registry if it exists

            RegistryKey key = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Demo_ScreenSaver");

            if (key == null)

                txtLabel.Text = "Mesoft Technologies";

            else

                txtLabel.Text = (string)key.GetValue("text");

        }

        private void ScreenSaverForm_MouseMove(object sender, MouseEventArgs e)

        {

            if (!previewMode)

            {

                if (!mouseLocation.IsEmpty)

                {

                    // Terminate if mouse is moved a significant distance

                    if (Math.Abs(mouseLocation.X - e.X) > 5 ||

                        Math.Abs(mouseLocation.Y - e.Y) > 5)

                        Application.Exit();

                }

                mouseLocation = e.Location;

            }

        }

        private void ScreenSaverForm_KeyPress(object sender, KeyPressEventArgs e)

        {

            if (!previewMode)

                Application.Exit();

        }

        private void ScreenSaverForm_MouseClick(object sender, MouseEventArgs e)

        {

            if (!previewMode)

                Application.Exit();

        }

    }

}