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C# Fade Form Effect With the AnimateWindow API Function

, 19 Oct 2008 CPOL 66.6K 3.3K 72
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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)
{
    base.OnLoad(e);
    AnimateWindow(this.Handle, 1000, AW_ACTIVATE | (_UseSlideAnimation ? 
                  AW_HOR_POSITIVE | AW_SLIDE : AW_BLEND));
}
protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
    base.OnClosing(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
{
}

Or

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

}

License

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

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About the Author

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

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Comments and Discussions

 
QuestionDid you know SlideControl? Pin
cheind17-Jan-10 19:13
membercheind17-Jan-10 19:13 
QuestionFlashing... Pin
Pete Mattison6-Feb-09 11:30
memberPete Mattison6-Feb-09 11:30 
GeneralTrying to use your code on other handles (open windows) Pin
Mister031-Dec-08 5:38
memberMister031-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);
           getInfo.Show();
       }

Can it be the way I open(.Show) the program I use
getInfo.Show();

[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;
            #endregion
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 Pin
kstr29-Oct-08 10:07
memberkstr29-Oct-08 10:07 
GeneralRe: It won't open in designer Pin
MCF.Goodwin29-Oct-08 15:43
memberMCF.Goodwin29-Oct-08 15:43 
General5 Pin
John Simmons / outlaw programmer22-Oct-08 3:30
mvpJohn Simmons / outlaw programmer22-Oct-08 3:30 
QuestionDisappearing textbox Pin
Member 197265521-Oct-08 4:09
memberMember 197265521-Oct-08 4:09 
AnswerRe: Disappearing textbox Pin
MCF.Goodwin21-Oct-08 4:38
memberMCF.Goodwin21-Oct-08 4:38 
GeneralRe: Disappearing textbox Pin
MCF.Goodwin21-Oct-08 13:34
memberMCF.Goodwin21-Oct-08 13:34 
Questionhow To in manage code Pin
Bnaya Eshet20-Oct-08 23:54
memberBnaya Eshet20-Oct-08 23:54 
AnswerRe: how To in manage code Pin
MCF.Goodwin21-Oct-08 0:45
memberMCF.Goodwin21-Oct-08 0:45 
GeneralMore AnimateWindow Options Pin
AnandChavali20-Oct-08 0:24
memberAnandChavali20-Oct-08 0:24 
GeneralIt doesn't as a MDI child Forms Pin
kenshiro200019-Oct-08 22:29
memberkenshiro200019-Oct-08 22:29 
QuestionRe: It doesn't as a MDI child Forms Pin
MCF.Goodwin19-Oct-08 23:48
memberMCF.Goodwin19-Oct-08 23:48 
GeneralRe: It doesn't as a MDI child Forms Pin
RVW20-Oct-08 22:50
memberRVW20-Oct-08 22:50 
GeneralReally Nice Pin
manas19-Oct-08 21:11
membermanas19-Oct-08 21:11 
Generalgreat!! Pin
yassir hannoun19-Oct-08 11:19
memberyassir hannoun19-Oct-08 11:19 

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