How to Trigger animation in WPF using C#

Question

I want to play animation using c# when i press Crtl

private void rtb_PreviewKeyUp(object sender, System.Windows.Input.KeyEventArgs e)
{
    if (e.Key == Key.LeftCtrl || e.Key == Key.RightCtrl)
    {
        //lstBox1.Opacity = 1;
        //here i want to play fadeIn animation
    }
}

Would you post the relevant XAML?

Rick S
– Rick S

2014-01-29 19:29:39 +00:00
Commented Jan 29, 2014 at 19:29 — Rick S
– Rick S, Commented Jan 29, 2014 at 19:29

Rohit Vats · Accepted Answer · 2014-01-29 19:51:12Z

2

Assuming listBox1 is declared in XAML and you want to apply Fade-In animation on it. You can toggle opacity from 0 to 1 like this:

DoubleAnimation animation = new DoubleAnimation(0.0, 1.0,
                                             new Duration(new TimeSpan(0,0,1)));
listBox1.BeginAnimation(ListBox.OpacityProperty, animation);

You can achieve that with Storyboard as well (but definitely no use when you can achieve that simply using double animation):

DoubleAnimation animation = new DoubleAnimation(0.0, 1.0,
                               new Duration(new TimeSpan(0, 0, 2)));
Storyboard storyBoard = new Storyboard();
storyBoard.Children.Add(animation);
Storyboard.SetTarget(animation, listBox);
Storyboard.SetTargetProperty(animation, new PropertyPath("Opacity"));
storyBoard.Begin();

edited Jan 29, 2014 at 19:51

answered Jan 29, 2014 at 19:30

Rohit Vats

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2 Comments

Uzair Ali Over a year ago

Ok its working but what if i want to play storyboard animation instead of coding?

Rohit Vats Over a year ago

Do you have storyboard declared in xaml or want to declare that in code behind as well?

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