Como animar uma propriedade sem usar um storyboard

  • Artigo

Este exemplo mostra uma maneira de aplicar uma animação a uma propriedade sem usar um Storyboardarquivo .

Observação

Essa funcionalidade não está disponível em XAML (Extensible Application Markup Language). Para obter informações sobre como animar uma propriedade em [! INCLUDEXAML, consulte Animar uma propriedade usando um storyboard.

Para aplicar uma animação local a uma propriedade, use o BeginAnimation método. Esse método usa dois parâmetros: a que especifica a propriedade a ser animada e a animação a ser aplicada a DependencyProperty essa propriedade.

Exemplo

O exemplo a seguir mostra como animar a largura e a cor do plano de fundo de um Buttonarquivo .

/*

   This sample demonstrates how to apply non-storyboard animations to a property.
   To animate in markup, you must use storyboards.

*/

using namespace System;
using namespace System::Windows;
using namespace System::Windows::Navigation;
using namespace System::Windows::Media;
using namespace System::Windows::Media::Animation;
using namespace System::Windows::Shapes;
using namespace System::Windows::Controls;


namespace Microsoft {
   namespace Samples {
      namespace Animation {
         namespace LocalAnimations {
            // Create the demonstration.
            public ref class LocalAnimationExample : Page {

            public: 
               LocalAnimationExample ()
               {
                  WindowTitle = "Local Animation Example";
                  StackPanel^ myStackPanel = gcnew StackPanel();
                  myStackPanel->Margin = Thickness(20);

                  // Create and set the Button.
                  Button^ aButton = gcnew Button();
                  aButton->Content = "A Button";

                  // Animate the Button's Width.
                  DoubleAnimation^ myDoubleAnimation = gcnew DoubleAnimation();
                  myDoubleAnimation->From = 75;
                  myDoubleAnimation->To = 300;
                  myDoubleAnimation->Duration = Duration(TimeSpan::FromSeconds(5));
                  myDoubleAnimation->AutoReverse = true;
                  myDoubleAnimation->RepeatBehavior = RepeatBehavior::Forever;

                  // Apply the animation to the button's Width property.
                  aButton->BeginAnimation(Button::WidthProperty, myDoubleAnimation);

                  // Create and animate a Brush to set the button's Background.
                  SolidColorBrush^ myBrush = gcnew SolidColorBrush();
                  myBrush->Color = Colors::Blue;

                  ColorAnimation^ myColorAnimation = gcnew ColorAnimation();
                  myColorAnimation->From = Colors::Blue;
                  myColorAnimation->To = Colors::Red;
                  myColorAnimation->Duration = Duration(TimeSpan::FromMilliseconds(7000));
                  myColorAnimation->AutoReverse = true;
                  myColorAnimation->RepeatBehavior = RepeatBehavior::Forever;

                  // Apply the animation to the brush's Color property.
                  myBrush->BeginAnimation(SolidColorBrush::ColorProperty, myColorAnimation);
                  aButton->Background = myBrush;

                  // Add the Button to the panel.
                  myStackPanel->Children->Add(aButton);
                  this->Content = myStackPanel;
               };
            };
         }
      }
   }
}

/*

   This sample demonstrates how to apply non-storyboard animations to a property.
   To animate in markup, you must use storyboards.

*/

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;

namespace Microsoft.Samples.Animation.LocalAnimations
{

    // Create the demonstration.
    public class LocalAnimationExample : Page
    {

        public LocalAnimationExample()
        {

            WindowTitle = "Local Animation Example";
            StackPanel myStackPanel = new StackPanel();
            myStackPanel.Margin = new Thickness(20);

            // Create and set the Button.
            Button aButton = new Button();
            aButton.Content = "A Button";

            // Animate the Button's Width.
            DoubleAnimation myDoubleAnimation = new DoubleAnimation();
            myDoubleAnimation.From = 75;
            myDoubleAnimation.To = 300;
            myDoubleAnimation.Duration =  new Duration(TimeSpan.FromSeconds(5));
            myDoubleAnimation.AutoReverse = true;
            myDoubleAnimation.RepeatBehavior = RepeatBehavior.Forever;

            // Apply the animation to the button's Width property.
            aButton.BeginAnimation(Button.WidthProperty, myDoubleAnimation);

            // Create and animate a Brush to set the button's Background.
            SolidColorBrush myBrush = new SolidColorBrush();
            myBrush.Color = Colors.Blue;

            ColorAnimation myColorAnimation = new ColorAnimation();
            myColorAnimation.From = Colors.Blue;
            myColorAnimation.To = Colors.Red;
            myColorAnimation.Duration =  new Duration(TimeSpan.FromMilliseconds(7000));
            myColorAnimation.AutoReverse = true;
            myColorAnimation.RepeatBehavior = RepeatBehavior.Forever;

            // Apply the animation to the brush's Color property.
            myBrush.BeginAnimation(SolidColorBrush.ColorProperty, myColorAnimation);
            aButton.Background = myBrush;

            // Add the Button to the panel.
            myStackPanel.Children.Add(aButton);
            this.Content = myStackPanel;
        }
    }
}

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'''This sample demonstrates how to apply non-storyboard animations to a property.
'''To animate in markup, you must use storyboards.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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

Namespace Microsoft.Samples.Animation.LocalAnimations

    ' Create the demonstration.
    Public Class LocalAnimationExample
        Inherits Page

        Public Sub New()

            WindowTitle = "Animate Property Example"
            Dim myStackPanel As New StackPanel()
            myStackPanel.Margin = New Thickness(20)

            ' Create and set the Button.
            Dim aButton As New Button()
            aButton.Content = "A Button"

            ' Animate the Button's Width.
            Dim myDoubleAnimation As New DoubleAnimation()
            myDoubleAnimation.From = 75
            myDoubleAnimation.To = 300
            myDoubleAnimation.Duration = New Duration(TimeSpan.FromSeconds(5))
            myDoubleAnimation.AutoReverse = True
            myDoubleAnimation.RepeatBehavior = RepeatBehavior.Forever

            ' Apply the animation to the button's Width property.
            aButton.BeginAnimation(Button.WidthProperty, myDoubleAnimation)

            ' Create and animate a Brush to set the button's Background.
            Dim myBrush As New SolidColorBrush()
            myBrush.Color = Colors.Blue

            Dim myColorAnimation As New ColorAnimation()
            myColorAnimation.From = Colors.Blue
            myColorAnimation.To = Colors.Red
            myColorAnimation.Duration = New Duration(TimeSpan.FromMilliseconds(7000))
            myColorAnimation.AutoReverse = True
            myColorAnimation.RepeatBehavior = RepeatBehavior.Forever

            ' Apply the animation to the brush's Color property.
            myBrush.BeginAnimation(SolidColorBrush.ColorProperty, myColorAnimation)
            aButton.Background = myBrush

            ' Add the Button to the panel.
            myStackPanel.Children.Add(aButton)
            Me.Content = myStackPanel
        End Sub
    End Class
End Namespace

Existe uma variedade de classes de animação no System.Windows.Media.Animation namespace para animar diferentes tipos de propriedades. Para obter mais informações sobre propriedades de animação, consulte Visão geral da animação. Para obter mais informações sobre propriedades de dependência (o tipo de propriedades mostradas neste exemplo) e suas funcionalidades, veja Visão geral das propriedades de dependência.

Há outras maneiras de animar sem usar Storyboard objetos, para obter mais informações, consulte Visão geral das técnicas de animação de propriedades.

Confira também