<Window x:Class="_temple.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1" Height="300" Width="300"

x:Name="window1" MouseWheel="Window_MouseWheel">

<Grid x:Name="g1">

</Grid>

using System;

using System.Windows;

using System.Windows.Input;

using System.Windows.Media.Animation;

namespace _temple

{

public partial class Window1 : Window

{

public Window1()

{

InitializeComponent();

}

private void Window_MouseWheel(object sender, MouseWheelEventArgs e)

{

int delta = e.Delta;

double w1 = this.window1.ActualWidth;

double w2 = w1 + 2 * delta / 10;

DoubleAnimation anima = new DoubleAnimation();

anima.Duration = new Duration(TimeSpan.FromSeconds(0.3));

anima.From = w1;

anima.To = w2;

anima.FillBehavior = FillBehavior.HoldEnd;

window1.BeginAnimation(Window.WidthProperty, anima);

}

}

}

Thanks.

void StartAnimation(double oldValue, double newValue)

{

double newWidth = newValue;

DoubleAnimation animation = new DoubleAnimation();

animation.From = oldValue;

animation.To = newWidth;

animation.Duration = new Duration(TimeSpan.FromSeconds(5));

Storyboard story = new Storyboard();

story.Children.Add(animation);

Storyboard.SetTargetName(this, this.Name);

Storyboard.SetTargetProperty(animation, new PropertyPath(Window.WidthProperty));

story.Begin(this);

}

My problem is that I don't necessarily know the ending value to apply to an animation. My window control has the SizeToContent="WidthAndHeight" property set and it basically sizes to it's content. I don't know what the content will be so it's difficult to specify a "new value" to animate to ... that's why I was thinking about the SizeChanged event handler, because you know the previous and new size.

Any ideas?