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Cómo: Animar una propiedad usando un objeto AnimationClock

  • Artículo

En este ejemplo se muestra cómo usar objetos Clock para animar una propiedad.

Hay tres maneras de animar una propiedad de dependencia:

Los objetos Storyboard y el método BeginAnimation permiten animar propiedades sin crear ni distribuir directamente relojes (para ejemplos, vea Cómo: Animar una propiedad utilizando un guión gráfico y Cómo: Animar una propiedad sin utilizar un guión gráfico); los relojes se crean y distribuyen automáticamente.

Ejemplo

En el siguiente ejemplo se muestra cómo crear una clase AnimationClock y aplicarla a dos propiedades similares.

/*
    This example shows how to create and apply
    an AnimationClock.
*/

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

namespace Microsoft.Samples.Animation.TimingBehaviors
{
    public class AnimationClockExample : Page
    {

        ScaleTransform myScaleTransform;

        public AnimationClockExample()
        {

            this.WindowTitle = "Opacity Animation Example";
            this.Background = Brushes.White;
            StackPanel myStackPanel = new StackPanel();
            myStackPanel.Margin = new Thickness(20);

            // Create a button that with a ScaleTransform.
            // The ScaleTransform will animate when the
            // button is clicked.
            Button myButton = new Button();
            myButton.Margin = new Thickness(50);
            myButton.HorizontalAlignment = HorizontalAlignment.Left;
            myButton.Content = "Click Me";
            myScaleTransform = new ScaleTransform(1,1);
            myButton.RenderTransform = myScaleTransform;

            // Associate an event handler with the
            // button's Click event.
            myButton.Click += new RoutedEventHandler(myButton_Clicked);

            myStackPanel.Children.Add(myButton);
            this.Content = myStackPanel;
        }

        // Create and apply and animation when the button is clicked.
        private void myButton_Clicked(object sender, RoutedEventArgs e)
        {

            // Create a DoubleAnimation to animate the
            // ScaleTransform.
            DoubleAnimation myAnimation =
                new DoubleAnimation(
                    1, // "From" value
                    5, // "To" value
                    new Duration(TimeSpan.FromSeconds(5))
                );
            myAnimation.AutoReverse = true;

            // Create a clock the for the animation.
            AnimationClock myClock = myAnimation.CreateClock();

            // Associate the clock the ScaleX and
            // ScaleY properties of the button's
            // ScaleTransform.
            myScaleTransform.ApplyAnimationClock(
                ScaleTransform.ScaleXProperty, myClock);
            myScaleTransform.ApplyAnimationClock(
                ScaleTransform.ScaleYProperty, myClock);
        }
    }
}

'
'    This example shows how to create and apply
'    an AnimationClock.
'


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


Namespace Microsoft.Samples.Animation.TimingBehaviors
    Public Class AnimationClockExample
        Inherits Page

        Private ReadOnly myScaleTransform As ScaleTransform

        Public Sub New()

            WindowTitle = "Opacity Animation Example"
            Background = Brushes.White
            Dim myStackPanel As New StackPanel With {
                .Margin = New Thickness(20)
            }

                ' Create a button that with a ScaleTransform.
                ' The ScaleTransform will animate when the
                ' button is clicked.
            Dim myButton As New Button With {
                .Margin = New Thickness(50),
                .HorizontalAlignment = HorizontalAlignment.Left,
                .Content = "Click Me"
            }
            myScaleTransform = New ScaleTransform(1,1)
            myButton.RenderTransform = myScaleTransform


            ' Associate an event handler with the
            ' button's Click event.
            AddHandler myButton.Click, AddressOf myButton_Clicked

            myStackPanel.Children.Add(myButton)
            Content = myStackPanel
        End Sub

        ' Create and apply and animation when the button is clicked.
        Private Sub myButton_Clicked(sender As Object, e As RoutedEventArgs)

            ' Create a DoubleAnimation to animate the
            ' ScaleTransform.
            Dim myAnimation As New DoubleAnimation(1, 5, New Duration(TimeSpan.FromSeconds(5))) With {
                .AutoReverse = True
            } ' "To" value -  "From" value

            ' Create a clock the for the animation.
            Dim myClock As AnimationClock = myAnimation.CreateClock()

            ' Associate the clock the ScaleX and
            ' ScaleY properties of the button's
            ' ScaleTransform.
            myScaleTransform.ApplyAnimationClock(ScaleTransform.ScaleXProperty, myClock)
            myScaleTransform.ApplyAnimationClock(ScaleTransform.ScaleYProperty, myClock)
        End Sub
    End Class
End Namespace

Para obtener un ejemplo que muestra cómo controlar interactivamente un objeto Clock después de iniciarse, vea Cómo: Controlar interactivamente un reloj.

Vea también