Timeline.CurrentTimeInvalidated Event

Definition

Tritt ein, wenn die CurrentTime-Eigenschaft der Clock der Zeitachse aktualisiert wird.Occurs when the CurrentTime property of the timeline's Clock is updated.

public:
 event EventHandler ^ CurrentTimeInvalidated;
public event EventHandler CurrentTimeInvalidated;
member this.CurrentTimeInvalidated : EventHandler 
Public Custom Event CurrentTimeInvalidated As EventHandler 

Examples

Im folgenden Beispiel wird gezeigt, wie für das CurrentTimeInvalidated-Ereignis registriert wird.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);
            myPanel.Children.Add(animatedRectangle);
            this.Content = myPanel;

            // Create a TextBlock to show the storyboard's current time.
            currentTimeTextBlock = new TextBlock();
            myPanel.Children.Add(currentTimeTextBlock);
            
            // 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");
            Storyboard.SetTargetProperty(angleAnimation, 
                new PropertyPath(RotateTransform.AngleProperty));
  
            Storyboard theStoryboard = new Storyboard();
            theStoryboard.Children.Add(angleAnimation);            
            
            // 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();       
        }
    }
}
'
'
'   This example shows how to register for the
'   CurrentTimeInvalidated event
'   using a Timeline. 
'
'

Imports System.Windows
Imports System.Windows.Navigation
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.Windows.Shapes
Imports System.Windows.Controls
Imports System.Windows.Input

Namespace Microsoft.Samples.Animation.TimingBehaviors


    Public Class TimelineCurrentTimeInvalidatedExample
        Inherits Page


        Private currentTimeTextBlock As TextBlock
        Public Sub New()

            ' Create a name scope.
            NameScope.SetNameScope(Me, New NameScope())

            WindowTitle = "GetAnimationBaseValue Example"
            Dim myPanel As New StackPanel()
            myPanel.Margin = New Thickness(20)

            ' Create a rectangle.
            Dim animatedRectangle As New Rectangle()
            With animatedRectangle
                .Width = 100
                .Height = 50
                .Margin = New Thickness(50)
                .Fill = Brushes.Orange
                .Stroke = Brushes.Gray
                .StrokeThickness = 2
            End With

            ' Create a RotateTransform.
            Dim animatedTransform As New RotateTransform()
            animatedTransform.Angle = 0
            Me.RegisterName("animatedTransform", animatedTransform)
            animatedRectangle.RenderTransform = animatedTransform
            animatedRectangle.RenderTransformOrigin = New Point(0.5, 0.5)
            myPanel.Children.Add(animatedRectangle)
            Me.Content = myPanel

            ' Create a TextBlock to show the storyboard's current time.
            currentTimeTextBlock = New TextBlock()
            myPanel.Children.Add(currentTimeTextBlock)

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

            Dim theStoryboard As New Storyboard()
            theStoryboard.Children.Add(angleAnimation)

            ' Register the CurrentTimeInvalidated event.
            ' You must register for events before you begin 
            ' the storyboard.
            AddHandler theStoryboard.CurrentTimeInvalidated, AddressOf storyboard_CurrentTimeInvalidated

            ' Start the storyboard.
            theStoryboard.Begin(animatedRectangle, True)


        End Sub

        Private Sub storyboard_CurrentTimeInvalidated(ByVal sender As Object, ByVal e As EventArgs)

            ' Sender is the clock that was created for this storyboard.
            Dim storyboardClock As Clock = CType(sender, Clock)

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



    End Class

End Namespace

Remarks

Verwenden Sie das CurrentStateInvalidated-Ereignis, wenn Sie benachrichtigt werden möchten, wenn die CurrentTime der Clock einer Zeitachse aktualisiert wird.Use the CurrentStateInvalidated event when you want to be notified when the CurrentTime of a timeline's Clock is updated.

Der Object-Parameter des EventHandler-Ereignis Handlers ist die Clockder Zeitachse.The Object parameter of the EventHandler event handler is the timeline's Clock.

Obwohl dieser Ereignishandler mit einer Zeitachse verknüpft ist, wird er tatsächlich mit dem für diese Zeitachse erstellten Clock registriert.Although this event handler appears to be associated with a timeline, it actually registers with the Clock created for this timeline. Weitere Informationen finden Sie unter Übersicht über Zeit Steuerungs Ereignisse.For more information, see the Timing Events Overview.

Applies to