Click here to Skip to main content
Click here to Skip to main content
Go to top

C# Fade Form Effect With the AnimateWindow API Function

, 19 Oct 2008
Rate this:
Please Sign up or sign in to vote.
An easy way to perform fade/slide effects for forms.

The Motivation

I required a fade/slide effect to replace a previous thread based approach that was using deprecated methods.

When consulting the oracle (Google), I was able to find more than a few articles that use opacity or utility type implementation of the AnimateWindow function, but I was looking for a solution to hide the functionality and keep things as simple as possible, so I created FadeForm.

The Objective

Write a class that implements/wraps the AnimateWindow function which can easily be added to existing code.

The Code

The FadePage Object

Create a new class that derives from System.Windows.Forms.Form which will allow us to extend the behavior of a standard form with the AnimateWindow method.

public abstract class FadeForm : Form

Next, create a member variable that will determine if we fade or slide, and a few constructors to assign the variable, with the default being the slide effect.

public abstract class FadeForm : Form
    private bool _UseSlideAnimation;
    public FadeForm() : this(false) { }
    public FadeForm(bool useSlideAnimation)
        _UseSlideAnimation = useSlideAnimation;

The AnimateWindow Implementation

This is really the guts of the class that will control the effects. The logic is based on a previous article, and modified to hide the actual implementation.

Declare the integers that define the effects and the functions internally to the fade page class.

const int AW_HIDE = 0X10000;
const int AW_ACTIVATE = 0X20000;
const int AW_HOR_POSITIVE = 0X1;
const int AW_HOR_NEGATIVE = 0X2;
const int AW_SLIDE = 0X40000;
const int AW_BLEND = 0X80000;
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int AnimateWindow
(IntPtr hwand, int dwTime, int dwFlags);

Finally, we override the load and close methods of the Form class to perform the automation.

protected override void OnLoad(EventArgs e)
    AnimateWindow(this.Handle, 1000, AW_ACTIVATE | (_UseSlideAnimation ? 
                  AW_HOR_POSITIVE | AW_SLIDE : AW_BLEND));
protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
    if (e.Cancel == false)
        AnimateWindow(this.Handle, 1000, AW_HIDE | (_UseSlideAnimation ? 
                      AW_HOR_NEGATIVE | AW_SLIDE : AW_BLEND));

Using the Class

Consuming the class is very simple, and requires a single line of code change to existing forms, by choosing to derive from FadeForm instead of the standard Form.

public partial class TestForm : Form

Changes to…

public partial class TestForm : FadeForm


public partial class TestForm : FadeForm
    public TestForm() : base(true|false) {}



This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer
United States United States
Ah, just another dev living the life of Dilbert. Smile | :)

Comments and Discussions

QuestionDid you know SlideControl? Pinmembercheind17-Jan-10 19:13 
QuestionFlashing... PinmemberPete Mattison6-Feb-09 11:30 
GeneralTrying to use your code on other handles (open windows) PinmemberMister031-Dec-08 5:38 
Hi there wonder if you can help me.
Im trying to use your code on external windows handle,,
I collect all open windows (IE internet explorer, Outlook, word and so on)
I then hides them and store them in my program (as thumbnails). Whan i the click on any thumb in my program i want that program to open (I can get that to work) and then blend whit your code (that wont work)

smal code sample
 void pc_Click(object sender, EventArgs e)
            PictureBox pic = (PictureBox)sender;
            EnumWindowsItem getInfo = new EnumWindowsItem((IntPtr)pic.Tag);
            Utility.FadeForm.AnimateWindow((IntPtr)pic.Tag, 1000,AW_ACTIVATE | AW_BLEND);
Can it be the way I open(.Show) the program I use
[DllImport("user32.dll", CharSet = CharSet.Auto)]
            public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
 #region ShowWindow
            public const Int32 SW_HIDE  =           0;
            public const Int32 SW_SHOWNORMAL       =1;
            public const Int32 SW_SHOWMINIMIZED    = 2;
            public const Int32 SW_SHOWMAXIMIZED    = 3;
            public const Int32 SW_SHOWNOACTIVATE   = 4;
            public const Int32 SW_SHOW             = 5;
            public const Int32 SW_MINIMIZE         = 6;
            public const Int32 SW_SHOWMINNOACTIVE  = 7;
            public const Int32 SW_SHOWNA           = 8;
            public const Int32 SW_RESTORE          = 9;
            public const Int32 SW_SHOWDEFAULT      = 10;
            public const Int32 SW_FORCEMINIMIZE = 11;
public void Show()
            UnManagedMethods.ShowWindow(this.hWnd, UnManagedMethods.SW_RESTORE);
Isn't it possibel or am I doing it wrong, Im no expert Smile | :)
GeneralIt won't open in designer Pinmemberkstr29-Oct-08 10:07 
GeneralRe: It won't open in designer PinmemberMCF.Goodwin29-Oct-08 15:43 
General5 PinmvpJohn Simmons / outlaw programmer22-Oct-08 3:30 
QuestionDisappearing textbox PinmemberMember 197265521-Oct-08 4:09 
AnswerRe: Disappearing textbox PinmemberMCF.Goodwin21-Oct-08 4:38 
GeneralRe: Disappearing textbox PinmemberMCF.Goodwin21-Oct-08 13:34 
Questionhow To in manage code PinmemberBnaya Eshet20-Oct-08 23:54 
AnswerRe: how To in manage code PinmemberMCF.Goodwin21-Oct-08 0:45 
GeneralMore AnimateWindow Options PinmemberAnandChavali20-Oct-08 0:24 
GeneralIt doesn't as a MDI child Forms Pinmemberkenshiro200019-Oct-08 22:29 
QuestionRe: It doesn't as a MDI child Forms PinmemberMCF.Goodwin19-Oct-08 23:48 
GeneralRe: It doesn't as a MDI child Forms PinmemberRVW20-Oct-08 22:50 
GeneralReally Nice Pinmembermanas19-Oct-08 21:11 
Generalgreat!! Pinmemberyassir hannoun19-Oct-08 11:19 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Mobile
Web04 | 2.8.140921.1 | Last Updated 19 Oct 2008
Article Copyright 2008 by MCF.Goodwin
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid