用C#做ScreenSaver

/*    Program      :    A Simple Screen Saver
*    File Name    :    ScreenSaver.cs
*    Author        :    Tran Khanh Hien
*    Date        :    06/20/2001
*    email        :    hientk@yahoo.com
*/

namespace Screen_Saver
{
    using System;
    using System.Drawing;
    using System.Collections;
    using System.ComponentModel;
    using System.WinForms;
    using System.Data;

    /// <summary>
    ///    Summary description for Form1.
    /// </summary>
    public class ScreenSaver : System.WinForms.Form
    {
        /// <summary>
        ///    Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components;
        private System.WinForms.Timer timerSaver;
        private System.WinForms.Label lblMarquee;

        private int  iSpeed = 2;
        private string strMarqueeText="C Sharp Screen Saver";

        private System.Drawing.Font fontMarquee = new System.Drawing.Font ("Arial", 20,
System.Drawing.FontStyle.Bold);
        private Color colorMarquee = System.Drawing.Color.FromARGB(255,255,255);

        private int iDistance;
        private int ixStart= 0;
        private int iyStart= 0;

        public ScreenSaver()
        {
            InitializeComponent();

            lblMarquee.Font=fontMarquee;
            lblMarquee.ForeColor=colorMarquee;
            System.Drawing.Cursor.Hide();
        }

        /// <summary>
        ///    Clean up any resources being used.
        /// </summary>
        public override void Dispose()
        {
            base.Dispose();
            components.Dispose();
        }

        /// <summary>
        ///    Required method for Designer support - do not modify
        ///    the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            System.Resources.ResourceManager resources = new System.Resources.ResourceManager (typeof
(ScreenSaver));
            this.components = new System.ComponentModel.Container ();
            this.timerSaver = new System.WinForms.Timer (this.components);
            this.lblMarquee = new System.WinForms.Label ();
            //@this.TrayHeight = 90;
            //@this.TrayLargeIcon = false;
            //@this.TrayAutoArrange = true;
            //@timerSaver.SetLocation (new System.Drawing.Point (7, 7));
            timerSaver.Interval = 1;
            timerSaver.Enabled = true;
            timerSaver.Tick += new System.EventHandler (this.timerSaver_Tick);
            lblMarquee.Location = new System.Drawing.Point (88, 0);
            lblMarquee.Size = new System.Drawing.Size (128, 48);
            lblMarquee.ForeColor = System.Drawing.Color.White;
            lblMarquee.TabIndex = 0;
            lblMarquee.Visible = false;
            this.MaximizeBox = false;
            this.StartPosition = System.WinForms.FormStartPosition.Manual;
            this.AutoScaleBaseSize = new System.Drawing.Size (5, 13);
            this.BorderStyle = System.WinForms.FormBorderStyle.None;
            this.KeyPreview = true;
            this.WindowState = System.WinForms.FormWindowState.Maximized;
            this.ShowInTaskbar = false;
            this.Icon = (System.Drawing.Icon) resources.GetObject ("$this.Icon");
            this.ControlBox = false;
            this.MinimizeBox = false;
            this.BackColor = System.Drawing.Color.Black;
            this.ClientSize = new System.Drawing.Size (300, 300);
            this.KeyDown += new System.WinForms.KeyEventHandler (this.Form1_KeyDown);
            this.MouseDown += new System.WinForms.MouseEventHandler (this.Form1_MouseDown);
            this.MouseMove += new System.WinForms.MouseEventHandler (this.Form1_MouseMove);
            this.Controls.Add (this.lblMarquee);
        }

        protected void timerSaver_Tick (object sender, System.EventArgs e)
        {
            lblMarquee.Text=strMarqueeText;
            lblMarquee.Height=lblMarquee.Font.Height;
            lblMarquee.Width=lblMarquee.Text.Length*(int)lblMarquee.Font.Size;

            PlayScreenSaver();
        }

        private void PlayScreenSaver()
        {
            //Get the working area of the the computer screen.
            System.Drawing.Rectangle ssWorkArea = System.WinForms.Screen.GetWorkingArea(this);

            lblMarquee.Location=new System.Drawing.Point(ssWorkArea.Width - iDistance,
                                        lblMarquee.Location.Y);

            //Make the label visible if it is not currently visible.
            lblMarquee.Visible=true;

            // Increment the label distance based on the speed set by the user.
            iDistance += iSpeed;
            // If the label is offscreen, then we want to reposition it to the right.
            if (lblMarquee.Location.X <= -(lblMarquee.Width))
            {
                //Reset the distance to 0.
                iDistance = 0;

                //If the label is at the top, move it to the middle.
                if (lblMarquee.Location.Y == 0)
                    lblMarquee.Location=new System.Drawing.Point(lblMarquee.Location.X,
(ssWorkArea.Height / 2));

                // If label is in the middle of the screen move it to the bottom.
                else if(lblMarquee.Location.Y== ssWorkArea.Height /2)
                    lblMarquee.Location=new System.Drawing.Point(lblMarquee.Location.X,ssWorkArea.Height -
lblMarquee.Height);
                //Move the label back to the top.
                else
                    lblMarquee.Location=new System.Drawing.Point(lblMarquee.Location.X,0);
            }
        }

        protected void Form1_MouseDown (object sender, System.WinForms.MouseEventArgs e)
        {
            StopScreenSaver();
        }

        protected void Form1_MouseMove (object sender, System.WinForms.MouseEventArgs e)
        {
            // Determine if the mouse cursor position has been stored previously.
            if (ixStart == 0 && iyStart == 0)
            {
                //Store the mouse cursor coordinates.
                ixStart = e.X;
                iyStart = e.Y;
                return;
            }
            // Has the mouse cursor moved since the screen saver was started?
            else if (e.X != ixStart || e.Y != iyStart)
                StopScreenSaver();

        }

        private void StopScreenSaver()
        {
            System.Drawing.Cursor.Show();
            timerSaver.Enabled=false;
            Application.Exit();
        }

        protected void Form1_KeyDown (object sender, System.WinForms.KeyEventArgs e)
        {
            StopScreenSaver();
        }

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        public static void Main(string[] args)
        {
            if (args.Length==1)
            {
                //Display the options dialog box.
                if (args[0].Substring(0,2).Equals("/c"))
                {
                    MessageBox.Show("Options are not available for this screen saver",
                                    " C# Screen Saver",
                                    MessageBox.IconInformation);
                    Application.Exit();
                }
                //Start the screen saver normally.
                else if (args[0]=="/s")
                    Application.Run(new ScreenSaver());

                //Diaplay the password dialog
                else if (args[0]=="/a")
                {
                    MessageBox.Show("Passwords are not available for this screen saver",
                                    " C# Screen Saver",
                                    MessageBox.IconInformation);
                    Application.Exit();
                }
            }
            //For any other args --> start.
            else
                Application.Run(new ScreenSaver());
        }

    }
}

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