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Come animare un valore BorderThickness

  • Articolo

In questo esempio viene illustrato come animare le modifiche allo spessore di un bordo usando la classe ThicknessAnimation.

Esempio

Nell'esempio seguente viene animato lo spessore di un bordo usando ThicknessAnimation. Nell'esempio viene utilizzata la proprietà BorderThickness di Border.

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

namespace SDKSamples
{
    public class ThicknessAnimationExample : Page
    {
        public ThicknessAnimationExample()
        {

            // Create a NameScope for this page so that
            // Storyboards can be used.
            NameScope.SetNameScope(this, new NameScope());

            // Create a Border which will be the target of the animation.
            Border myBorder = new Border();
            myBorder.Background = Brushes.Gray;
            myBorder.BorderBrush = Brushes.Black;
            myBorder.BorderThickness = new Thickness(1);
            myBorder.Margin = new Thickness(0, 60, 0, 20);
            myBorder.Padding = new Thickness(20);

            // Assign the border a name so that
            // it can be targeted by a Storyboard.
            this.RegisterName(
                "myAnimatedBorder", myBorder);

            ThicknessAnimation myThicknessAnimation = new ThicknessAnimation();
            myThicknessAnimation.Duration = TimeSpan.FromSeconds(1.5);
            myThicknessAnimation.FillBehavior = FillBehavior.HoldEnd;

            // Set the From and To properties of the animation.
            // BorderThickness animates from left=1, right=1, top=1, and bottom=1
            // to left=28, right=28, top=14, and bottom=14 over one and a half seconds.
            myThicknessAnimation.From = new Thickness(1, 1, 1, 1);
            myThicknessAnimation.To = new Thickness(28, 14, 28, 14);

            // Set the animation to target the Size property
            // of the object named "myArcSegment."
            Storyboard.SetTargetName(myThicknessAnimation, "myAnimatedBorder");
            Storyboard.SetTargetProperty(
                myThicknessAnimation, new PropertyPath(Border.BorderThicknessProperty));

            // Create a storyboard to apply the animation.
            Storyboard ellipseStoryboard = new Storyboard();
            ellipseStoryboard.Children.Add(myThicknessAnimation);

            // Start the storyboard when the Path loads.
            myBorder.Loaded += delegate(object sender, RoutedEventArgs e)
            {
                ellipseStoryboard.Begin(this);
            };

            StackPanel myStackPanel = new StackPanel();
            myStackPanel.HorizontalAlignment = HorizontalAlignment.Center;
            myStackPanel.Children.Add(myBorder);

            Content = myStackPanel;
        }
    }
}


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

Namespace SDKSamples
    Public Class ThicknessAnimationExample
        Inherits Page
        Public Sub New()

            ' Create a NameScope for this page so that
            ' Storyboards can be used.
            NameScope.SetNameScope(Me, New NameScope())

            ' Create a Border which will be the target of the animation.
            Dim myBorder As New Border()
            With myBorder
                .Background = Brushes.Gray
                .BorderBrush = Brushes.Black
                .BorderThickness = New Thickness(1)
                .Margin = New Thickness(0, 60, 0, 20)
                .Padding = New Thickness(20)
            End With

            ' Assign the border a name so that
            ' it can be targeted by a Storyboard.
            Me.RegisterName("myAnimatedBorder", myBorder)

            Dim myThicknessAnimation As New ThicknessAnimation()
            With myThicknessAnimation
                .Duration = TimeSpan.FromSeconds(1.5)
                .FillBehavior = FillBehavior.HoldEnd

                ' Set the From and To properties of the animation.
                ' BorderThickness animates from left=1, right=1, top=1, and bottom=1 
                ' to left=28, right=28, top=14, and bottom=14 over one and a half seconds.
                .From = New Thickness(1, 1, 1, 1)
                .To = New Thickness(28, 14, 28, 14)
            End With

            ' Set the animation to target the Size property
            ' of the object named "myArcSegment."
            Storyboard.SetTargetName(myThicknessAnimation, "myAnimatedBorder")
            Storyboard.SetTargetProperty(myThicknessAnimation, New PropertyPath(Border.BorderThicknessProperty))

            ' Create a storyboard to apply the animation.
            Dim ellipseStoryboard As New Storyboard()
            ellipseStoryboard.Children.Add(myThicknessAnimation)

            ' Start the storyboard when the Path loads.
            AddHandler myBorder.Loaded, Sub(sender As Object, e As RoutedEventArgs) ellipseStoryboard.Begin(Me)

            Dim myStackPanel As New StackPanel()
            myStackPanel.HorizontalAlignment = HorizontalAlignment.Center
            myStackPanel.Children.Add(myBorder)

            Content = myStackPanel
        End Sub
    End Class
End Namespace

Per l'esempio completo, vedere raccolta di esempi di animazione .

Vedere anche