splashappcontext.cs

c#下做的启动界面

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace SplashSample
{
	public class SplashAppContext : ApplicationContext
	{
		Form mainForm = null;
		Timer splashTimer = new Timer();		

		public SplashAppContext(Form mainForm, Form splashForm) : base(splashForm)
		{
			this.mainForm = mainForm;
	
			splashTimer.Tick += new EventHandler(SplashTimeUp);
			splashTimer.Interval = 2000;
			splashTimer.Enabled = true;
		}

		/// <summary>
		/// This is the timer event handler.  We use the timer to tell the ApplicationContext 
		/// that the splash screen is ready to be closed.
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void SplashTimeUp(object sender, EventArgs e)
		{
			//This is called if the splash is ready to be closed.  In order to do this
			//we first dispose of the timer (we dont need any leaks do we?) and then
			//call the base.MainForm.Close function which will triger the MainFormClosed event
			//that we overrode so we can set the Application Context's main form as the 
			//main form the user passed into the constructor.
		
			splashTimer.Enabled = false;
			splashTimer.Dispose();

			base.MainForm.Close();			
		}

		/// <summary>
		/// Normaly, if not overridden, this event will call ExitThreadCore function.
		/// We have overridden it to catch when the splash form has closed.  When the
		/// spash form closes, we want to set the main form passed in the contructor to
		/// the base.MainForm property.  when the main form closes, this override will be
		/// called again, and we just pass the call onto the base.OnMainFormClosed, with will
		/// tells the Application object to terminate the UI thread.
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		protected override void OnMainFormClosed(object sender, EventArgs e)
		{
			if (sender is Splash)
			{
				base.MainForm = this.mainForm;
				base.MainForm.Show();
			}
			else if (sender is Form1)
			{
				base.OnMainFormClosed(sender, e);
			}
		}

		/// <summary>
		/// This sets how long the spash form will show once it is at 100% opacity.  Default is 2 seconds.
		/// </summary>
		public int SecondsSplashShown
		{
			set
			{
				splashTimer.Interval = value * 1000;				
			}
		}
	}



	public class SplashFadeAppContext : ApplicationContext
	{
		/// <summary>
		/// Internal flags to tell process what state the splash form is in
		/// </summary>
		private enum FormStatus
		{
			Open = 1,
			Opening = 2,
			Closing = 4,
			Closed = 8
		}

		private FormStatus formStatus = FormStatus.Open;
		private Form mainForm = null;
		private Timer splashTimer = new Timer();						
		private int showSplashInterval = 2000;
		private int fadeInterval = 50;		
		private bool doFadeClose = false;
		

		public SplashFadeAppContext(Form mainForm, Form splashForm) : base(splashForm)
		{			
			this.mainForm = mainForm;
			
			splashTimer.Tick += new EventHandler(SplashTimeUp);
			splashTimer.Interval = fadeInterval;
			splashTimer.Enabled = true;
		}

		/// <summary>
		/// This is the timer event that controls what our spash screen does.
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void SplashTimeUp(object sender, EventArgs e)
		{						
			if (formStatus == FormStatus.Opening)
			{
				//if the splash is opening, the opacity will increase in increments of 5 until it is fully
				//shown.  Once it is fully opacic, it sets the status flag to open.
				if (base.MainForm.Opacity < 1)
					base.MainForm.Opacity += .05;
				else								
					formStatus = FormStatus.Open;									
			}
			else if (formStatus == FormStatus.Closing)
			{
				//if the splash is closing, the opacity will decrease in increments of 5 until it is fully
				//hidden.  Once it is fully transparent, it sets the status flag to closed.
				if (base.MainForm.Opacity > .10)
				{
					base.MainForm.Opacity -= .05;
					splashTimer.Interval = fadeInterval;
				}
				else
				{
					formStatus = FormStatus.Closed;					
				}
			}
			else if (formStatus == FormStatus.Open)
			{
				//Once the splash is open and fully shown, the timer interval is set to the splash delay setting,
				//which is defaulted to 2 seconds, and then sets the status flag depending on if the user
				//wants to just close the splash or fade it out.
				splashTimer.Interval = showSplashInterval;				

				if (doFadeClose)
					formStatus = FormStatus.Closing;
				else
					formStatus = FormStatus.Closed;				
			}			
			else if(formStatus == FormStatus.Closed)
			{
				//This is called if the splash is ready to be closed.  In order to do this
				//we first dispose of the timer (we dont need any leaks do we?) and then
				//call the base.MainForm.Close function which will triger the MainFormClosed event
				//that we overrode so we can set the Application Context's main form as the 
				//main form the user passed into the constructor.
				splashTimer.Enabled = false;
				splashTimer.Dispose();
				base.MainForm.Close();
			}
		}

		/// <summary>
		/// Normaly, if not overridden, this event will call ExitThreadCore function.
		/// We have overridden it to catch when the splash form has closed.  When the
		/// spash form closes, we want to set the main form passed in the contructor to
		/// the base.MainForm property.  when the main form closes, this override will be
		/// called again, and we just pass the call onto the base.OnMainFormClosed, with will
		/// tells the Application object to terminate the UI thread.
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		protected override void OnMainFormClosed(object sender, EventArgs e)
		{
			if (sender is Splash)
			{
				base.MainForm = this.mainForm;
				base.MainForm.Show();
			}
			else if (sender is Form1)
			{
				base.OnMainFormClosed(sender, e);
			}
		}

		#region Public Properties

		/// <summary>
		/// Bool that determines if spash form will fade up from 0% opacity to 100% when 
		/// the spash form opens.  Default is false.
		/// </summary>
		public bool DoFadeOpen
		{
			set
			{
				if (value == true)
				{
					base.MainForm.Opacity = 0;
					formStatus = FormStatus.Opening;
				}
			}
		}

		/// <summary>
		/// Bool that determines if spash form will fade down from 100% opacity to 0% when 
		/// the spash form closes.  Default is false.
		/// </summary>
		public bool DoFadeClose
		{
			set
			{
				doFadeClose = value;
			}
		}

		/// <summary>
		/// This sets how long the spash form will show once it is at 100% opacity.  Default is 2 seconds.
		/// </summary>
		public int SecondsSplashShown
		{
			set
			{
				showSplashInterval = value * 1000;
			}
		}
		#endregion Public Properties
	}
}