如何：使用关键帧对布尔属性值进行动画处理
本示例演示如何使用关键帧对 Button 控件的布尔属性值进行动画处理。
示例
下面的示例使用 BooleanAnimationUsingKeyFrames 类对 Button 控件的 IsEnabled 属性进行动画处理。 此示例中的所有关键帧都使用 DiscreteBooleanKeyFrame 类的一个实例。 诸如 DiscreteBooleanKeyFrame 的离散关键帧将创建突然跳跃值，也就是说，动画的移动是急拉动作。
' Demonstrates a BooleanAnimationUsingKeyFrames. The animation is used to
' animate the IsEnabled property of a button.
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Shapes
Imports System.Windows.Media.Animation
Imports System.Windows.Media
Namespace Microsoft.Samples.KeyFrameExamples
Public Class BooleanAnimationUsingKeyFramesExample
Inherits Page
Public Sub New()
Title = "BooleanAnimationUsingKeyFrames Example"
Background = Brushes.White
Margin = New Thickness(20)
' Create a NameScope for this page so that
' Storyboards can be used.
NameScope.SetNameScope(Me, New NameScope())
Dim myStackPanel As New StackPanel()
myStackPanel.Orientation = Orientation.Vertical
myStackPanel.Margin = New Thickness(20)
' Create a TextBlock to introduce the example.
Dim myTextBlock As New TextBlock()
myTextBlock.Text = "Click the button to animate its IsEnabled property" & " with aBooleanAnimationUsingKeyFrames animation."
myStackPanel.Children.Add(myTextBlock)
' Create the Button that is the target of the animation.
Dim myButton As New Button()
myButton.Margin = New Thickness(200)
myButton.Content = "Click Me"
myStackPanel.Children.Add(myButton)
' Assign the Button a name so that
' it can be targeted by a Storyboard.
Me.RegisterName("AnimatedButton", myButton)
' Create a BooleanAnimationUsingKeyFrames to
' animate the IsEnabled property of the Button.
Dim booleanAnimation As New BooleanAnimationUsingKeyFrames()
booleanAnimation.Duration = TimeSpan.FromSeconds(4)
' All the key frames defined below are DiscreteBooleanKeyFrames.
' Discrete key frames create sudden "jumps" between values
' (no interpolation). Only discrete key frames can be used
' for Boolean key frame animations.
' Value at the beginning is false
booleanAnimation.KeyFrames.Add(New DiscreteBooleanKeyFrame(False, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(0.0)))) ' KeyTime - Target value (KeyValue)
' Value becomes true after the first second.
booleanAnimation.KeyFrames.Add(New DiscreteBooleanKeyFrame(True, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(1.0)))) ' KeyTime - Target value (KeyValue)
' Value becomes false after the 2nd second.
booleanAnimation.KeyFrames.Add(New DiscreteBooleanKeyFrame(False, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.0)))) ' KeyTime - Target value (KeyValue)
' Value becomes true after the third second.
booleanAnimation.KeyFrames.Add(New DiscreteBooleanKeyFrame(True, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(3.0)))) ' KeyTime - Target value (KeyValue)
' Value becomes false after 3 and half seconds.
booleanAnimation.KeyFrames.Add(New DiscreteBooleanKeyFrame(False, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(3.5)))) ' KeyTime - Target value (KeyValue)
' Value becomes true after the fourth second.
booleanAnimation.KeyFrames.Add(New DiscreteBooleanKeyFrame(True, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(4.0)))) ' KeyTime - Target value (KeyValue)
' Set the animation to target the IsEnabled property
' of the object named "AnimatedButton".
Storyboard.SetTargetName(booleanAnimation, "AnimatedButton")
Storyboard.SetTargetProperty(booleanAnimation, New PropertyPath(Button.IsEnabledProperty))
' Create a storyboard to apply the animation.
Dim myStoryboard As New Storyboard()
myStoryboard.Children.Add(booleanAnimation)
' Start the storyboard when the button is clicked.
AddHandler myButton.Click, Sub(sender As Object, e As RoutedEventArgs) myStoryboard.Begin(Me)
Content = myStackPanel
End Sub
End Class
End Namespace
// Demonstrates a BooleanAnimationUsingKeyFrames. The animation is used to
// animate the IsEnabled property of a button.
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
using System.Windows.Media;
namespace Microsoft.Samples.KeyFrameExamples
{
public class BooleanAnimationUsingKeyFramesExample : Page
{
public BooleanAnimationUsingKeyFramesExample()
{
Title = "BooleanAnimationUsingKeyFrames Example";
Background = Brushes.White;
Margin = new Thickness(20);
// Create a NameScope for this page so that
// Storyboards can be used.
NameScope.SetNameScope(this, new NameScope());
StackPanel myStackPanel = new StackPanel();
myStackPanel.Orientation = Orientation.Vertical;
myStackPanel.Margin = new Thickness(20);
// Create a TextBlock to introduce the example.
TextBlock myTextBlock = new TextBlock();
myTextBlock.Text = "Click the button to animate its IsEnabled property"
+ " with aBooleanAnimationUsingKeyFrames animation.";
myStackPanel.Children.Add(myTextBlock);
// Create the Button that is the target of the animation.
Button myButton = new Button();
myButton.Margin = new Thickness(200);
myButton.Content = "Click Me";
myStackPanel.Children.Add(myButton);
// Assign the Button a name so that
// it can be targeted by a Storyboard.
this.RegisterName(
"AnimatedButton", myButton);
// Create a BooleanAnimationUsingKeyFrames to
// animate the IsEnabled property of the Button.
BooleanAnimationUsingKeyFrames booleanAnimation
= new BooleanAnimationUsingKeyFrames();
booleanAnimation.Duration = TimeSpan.FromSeconds(4);
// All the key frames defined below are DiscreteBooleanKeyFrames.
// Discrete key frames create sudden "jumps" between values
// (no interpolation). Only discrete key frames can be used
// for Boolean key frame animations.
// Value at the beginning is false
booleanAnimation.KeyFrames.Add(
new DiscreteBooleanKeyFrame(
false, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(0.0))) // KeyTime
);
// Value becomes true after the first second.
booleanAnimation.KeyFrames.Add(
new DiscreteBooleanKeyFrame(
true, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(1.0))) // KeyTime
);
// Value becomes false after the 2nd second.
booleanAnimation.KeyFrames.Add(
new DiscreteBooleanKeyFrame(
false, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.0))) // KeyTime
);
// Value becomes true after the third second.
booleanAnimation.KeyFrames.Add(
new DiscreteBooleanKeyFrame(
true, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(3.0))) // KeyTime
);
// Value becomes false after 3 and half seconds.
booleanAnimation.KeyFrames.Add(
new DiscreteBooleanKeyFrame(
false, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(3.5))) // KeyTime
);
// Value becomes true after the fourth second.
booleanAnimation.KeyFrames.Add(
new DiscreteBooleanKeyFrame(
true, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(4.0))) // KeyTime
);
// Set the animation to target the IsEnabled property
// of the object named "AnimatedButton".
Storyboard.SetTargetName(booleanAnimation, "AnimatedButton");
Storyboard.SetTargetProperty(
booleanAnimation, new PropertyPath(Button.IsEnabledProperty));
// Create a storyboard to apply the animation.
Storyboard myStoryboard = new Storyboard();
myStoryboard.Children.Add(booleanAnimation);
// Start the storyboard when the button is clicked.
myButton.Click += delegate(object sender, RoutedEventArgs e)
{
myStoryboard.Begin(this);
};
Content = myStackPanel;
}
}
}
<!-- Demonstrates a BooleanAnimationUsingKeyFrames. The animation is used to
animate the IsEnabled property of a button. -->
<Page
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
WindowTitle="KeyFrameBoolean Animation Example">
<StackPanel Orientation="Vertical" Margin="20">
<TextBlock>
Click the button to animate its IsEnabled property with a
BooleanAnimationUsingKeyFrames animation.
</TextBlock>
<Button Name="myAnimatedButton" Margin="200">Click Me
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Click">
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames
Storyboard.TargetName="myAnimatedButton"
Storyboard.TargetProperty="IsEnabled"
Duration="0:0:4" FillBehavior="HoldEnd">
<!-- All the key frames below are DiscreteBooleanKeyFrames. Discrete key frames create
sudden "jumps" between values (no interpolation). Only discrete key frames can be used
for Boolean key frame animations. -->
<DiscreteBooleanKeyFrame Value="False" KeyTime="0:0:0" />
<DiscreteBooleanKeyFrame Value="True" KeyTime="0:0:1" />
<DiscreteBooleanKeyFrame Value="False" KeyTime="0:0:2" />
<DiscreteBooleanKeyFrame Value="True" KeyTime="0:0:3" />
<DiscreteBooleanKeyFrame Value="False" KeyTime="0:0:3.5" />
<DiscreteBooleanKeyFrame Value="True" KeyTime="0:0:4" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
</StackPanel>
</Page>
有关完整示例，请参见 KeyFrame Animation Sample（KeyFrame 动画示例）。
请参见
参考
BooleanAnimationUsingKeyFrames