Timeline.CurrentTimeInvalidated Event


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Occurs when the CurrentTime property of the timeline's Clock is updated.

Namespace:   System.Windows.Media.Animation
Assembly:  PresentationCore (in PresentationCore.dll)

public event EventHandler CurrentTimeInvalidated

Use the CurrentStateInvalidated event when you want to be notified when the CurrentTime of a timeline's Clock is updated.

The Object parameter of the EventHandler event handler is the timeline's Clock.

Although this event handler appears to be associated with a timeline, it actually registers with the Clock created for this timeline. For more information, see the Timing Events Overview.

The following example shows how to register for the CurrentTimeInvalidated event.


   This example shows how to register for the
   CurrentTimeInvalidated event
   using a Timeline. 


using System;
using System.Windows;
using System.Windows.Navigation;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Controls;
using System.Windows.Input;

namespace Microsoft.Samples.Animation.TimingBehaviors

    public class TimelineCurrentTimeInvalidatedExample : Page {

        private TextBlock currentTimeTextBlock;
        public TimelineCurrentTimeInvalidatedExample()

            // Create a name scope.
            NameScope.SetNameScope(this, new NameScope());

            WindowTitle = "GetAnimationBaseValue Example";
            StackPanel myPanel = new StackPanel();
            myPanel.Margin = new Thickness(20);     

            // Create a rectangle.
            Rectangle animatedRectangle = new Rectangle();
            animatedRectangle.Width = 100;
            animatedRectangle.Height = 50;
            animatedRectangle.Margin = new Thickness(50);
            animatedRectangle.Fill = Brushes.Orange;
            animatedRectangle.Stroke = Brushes.Gray;
            animatedRectangle.StrokeThickness = 2;

            // Create a RotateTransform.
            RotateTransform animatedTransform = new RotateTransform();
            animatedTransform.Angle = 0;
            this.RegisterName("animatedTransform", animatedTransform);
            animatedRectangle.RenderTransform = animatedTransform;
            animatedRectangle.RenderTransformOrigin = new Point(0.5,0.5);
            this.Content = myPanel;

            // Create a TextBlock to show the storyboard's current time.
            currentTimeTextBlock = new TextBlock();

            // Animate the RotateTransform's angle using a Storyboard.
            DoubleAnimation angleAnimation = new DoubleAnimation(0,360, TimeSpan.FromSeconds(5));
            angleAnimation.RepeatBehavior = RepeatBehavior.Forever;
            Storyboard.SetTargetName(angleAnimation, "animatedTransform");
                new PropertyPath(RotateTransform.AngleProperty));

            Storyboard theStoryboard = new Storyboard();

            // Register the CurrentTimeInvalidated event.
            // You must register for events before you begin 
            // the storyboard.
            theStoryboard.CurrentTimeInvalidated += 
                new EventHandler(storyboard_CurrentTimeInvalidated);

            // Start the storyboard.
            theStoryboard.Begin(animatedRectangle, true);


        private void storyboard_CurrentTimeInvalidated(object sender, EventArgs e)

            // Sender is the clock that was created for this storyboard.
            Clock storyboardClock = (Clock)sender;

            // Update the TextBlock with the storyboard's current time.
            currentTimeTextBlock.Text = storyboardClock.CurrentTime.ToString();       



.NET Framework
Available since 3.0
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