用C#做ScreenSaver

March 25,2004

/* Program    : A Simple Screen Saver
* File Name : ScreenSaver.cs
* Author       : Tran Khanh Hien
* Date       : 06/20/2001
* email       : [email protected]
*/

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());
      }

}
}