Timeline.CurrentTimeInvalidated Evento

Definición

Espacio de nombres:

System.Windows.Media.Animation

Ensamblado:

PresentationCore.dll

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

C#

public event EventHandler CurrentTimeInvalidated;

Tipo de evento

EventHandler

Ejemplos

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

C#

/*

   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();       
        }
    }
}

Comentarios

Use el CurrentStateInvalidated evento cuando desee recibir una notificación cuando se actualice la CurrentTime propiedad de una escala de tiempo Clock .

El Object parámetro del controlador de EventHandler eventos es el de la escala de tiempo.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. Para obtener más información, vea Información general sobre eventos de control de tiempo.

Se aplica a