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WPF Animations

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Join Date: Jul 2006

Posts: 7

Reputation: Uros Bregar is an unknown quantity at this point

Solved Threads: 0

Uros Bregar Uros Bregar is offline

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WPF Animations

Feb 6th, 2009

Hi

I am trying to create and start an animation in code instead of using xaml. When I use the Storyboard object(second example) nothing happens(There are no visible results of the animation), if I set animation's properties and start it without using the Storyboard object everything works normaly(first example). Below is the sample code which is put in the event handler for a button which is on the UserControl.

This works normaly

 Help with Code Tags 
 c# Syntax (Toggle Plain Text) 
btn_Click(object sender, RoutedEventArgs e)
{
LinearGradientBrush mask = new LinearGradientBrush();
 
GradientStop transparentStop = new GradientStop(Colors.Transparent, 0);
GradientStop visibleStop = new GradientStop(Colors.Black, 0);
 
mask.GradientStops.Add(transparentStop);
mask.GradientStops.Add(visibleStop);
 
this.OpacityMask = mask;
 
DoubleAnimation visibleStopAnimation = new DoubleAnimation(0, 1.2, TimeSpan.FromSeconds(1.2), FillBehavior.HoldEnd);
visibleStop.BeginAnimation(GradientStop.OffsetProperty, visibleStopAnimation);
}
btn_Click(object sender, RoutedEventArgs e)
{
LinearGradientBrush mask = new LinearGradientBrush();

GradientStop transparentStop = new GradientStop(Colors.Transparent, 0);
GradientStop visibleStop = new GradientStop(Colors.Black, 0);

mask.GradientStops.Add(transparentStop);
mask.GradientStops.Add(visibleStop);

this.OpacityMask = mask;

DoubleAnimation visibleStopAnimation = new DoubleAnimation(0, 1.2, TimeSpan.FromSeconds(1.2), FillBehavior.HoldEnd);
visibleStop.BeginAnimation(GradientStop.OffsetProperty, visibleStopAnimation);
}

This doesn't work

 Help with Code Tags 
 c# Syntax (Toggle Plain Text) 
btn_Click(object sender, RoutedEventArgs e)
{
LinearGradientBrush mask = new LinearGradientBrush();
GradientStop transparentStop = new GradientStop(Colors.Transparent, 0);
GradientStop visibleStop = new GradientStop(Colors.Black, 0);
mask.GradientStops.Add(transparentStop);
mask.GradientStops.Add(visibleStop);
this.OpacityMask = mask;
 
Storyboard story = new Storyboard();
story.Duration = TimeSpan.FromSeconds(1);
DoubleAnimation visibleStopAnimation = new DoubleAnimation(0, 1, TimeSpan.FromSeconds(1), FillBehavior.HoldEnd);
Storyboard.SetTarget(visibleStopAnimation, visibleStop);
Storyboard.SetTargetProperty(visibleStopAnimation, new PropertyPath("(Offset)"));
story.Children.Add(visibleStopAnimation);
story.Begin();
}
btn_Click(object sender, RoutedEventArgs e)
{
LinearGradientBrush mask = new LinearGradientBrush();
GradientStop transparentStop = new GradientStop(Colors.Transparent, 0);
GradientStop visibleStop = new GradientStop(Colors.Black, 0);
mask.GradientStops.Add(transparentStop);
mask.GradientStops.Add(visibleStop);
this.OpacityMask = mask;

Storyboard story = new Storyboard();
story.Duration = TimeSpan.FromSeconds(1);
DoubleAnimation visibleStopAnimation = new DoubleAnimation(0, 1, TimeSpan.FromSeconds(1), FillBehavior.HoldEnd);
Storyboard.SetTarget(visibleStopAnimation, visibleStop);
Storyboard.SetTargetProperty(visibleStopAnimation, new PropertyPath("(Offset)"));
story.Children.Add(visibleStopAnimation);
story.Begin();
}