Timeline.CurrentTimeInvalidated Event

Definition

Tiene lugar cuando se actualiza la propiedad CurrentTime del Clock de la escala de tiempo.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

En el ejemplo siguiente se muestra cómo registrarse para el evento CurrentTimeInvalidated.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

Utilice el evento CurrentStateInvalidated cuando desee recibir una notificación cuando se actualice el CurrentTime de la Clock de una escala de tiempo.Use the CurrentStateInvalidated event when you want to be notified when the CurrentTime of a timeline's Clock is updated.

El parámetro Object del controlador de eventos EventHandler es el Clockde la escala de tiempo.The Object parameter of the EventHandler event handler is the timeline's Clock.

Aunque este controlador de eventos parece estar asociado a una escala de tiempo, realmente se registra con el Clock creado para esta escala de tiempo.Although this event handler appears to be associated with a timeline, it actually registers with the Clock created for this timeline. Para obtener más información, consulte la información General sobre eventos de control de tiempo.For more information, see the Timing Events Overview.

Applies to