C# WPF淡入/淡出仅运行一次
我有一个故事板和触发器的风格。动画效果很好,但只有一次 我有两个故事板FadeIn和FadeOut。在企业中,我启动FadeIn动画,在ExitActions中启动FadeOut动画。我用代码开始整个动画C# WPF淡入/淡出仅运行一次,c#,wpf,xaml,C#,Wpf,Xaml,我有一个故事板和触发器的风格。动画效果很好,但只有一次 我有两个故事板FadeIn和FadeOut。在企业中,我启动FadeIn动画,在ExitActions中启动FadeOut动画。我用代码开始整个动画 TextBlock.StartFade = true; 当我调试上述代码时,每次命中StartFade都是False(这是正确的) 那么我做错了什么 以下是XAML中的样式。FadingTextBlock只是一个具有StartFade依赖属性的自定义TextBlock <Style T
TextBlock.StartFade = true;
当我调试上述代码时,每次命中StartFade都是False(这是正确的)
那么我做错了什么
以下是XAML中的样式。FadingTextBlock只是一个具有StartFade依赖属性的自定义TextBlock
<Style TargetType="{x:Type Controls:FadingTextBlock}">
<Setter Property="Visibility" Value="Collapsed" />
<Setter Property="StartFade" Value="False" />
<Setter Property="Opacity" Value="1.0" />
<Style.Resources>
<Storyboard x:Key="FadeIn">
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Controls:FadingTextBlock.Opacity)" Storyboard.TargetName="{x:Null}">
<EasingDoubleKeyFrame KeyTime="0:0:0.0" Value="0.0" />
<EasingDoubleKeyFrame KeyTime="0:0:1.5" Value="1.0" />
</DoubleAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Controls:FadingTextBlock.Visibility)" Storyboard.TargetName="{x:Null}">
<DiscreteObjectKeyFrame KeyTime="0:0:0.0" Value="{x:Static Visibility.Visible}"/>
</ObjectAnimationUsingKeyFrames>
<BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="(Controls:FadingTextBlock.StartFade)" Storyboard.TargetName="{x:Null}">
<DiscreteBooleanKeyFrame KeyTime="0:0:1.5" Value="False" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="FadeOut">
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Controls:FadingTextBlock.Opacity)" Storyboard.TargetName="{x:Null}">
<EasingDoubleKeyFrame KeyTime="0:0:0.0" Value="1.0" />
<EasingDoubleKeyFrame KeyTime="0:0:1.5" Value="0.0" />
</DoubleAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Controls:FadingTextBlock.Visibility)" Storyboard.TargetName="{x:Null}">
<DiscreteObjectKeyFrame KeyTime="0:0:1.5" Value="{x:Static Visibility.Collapsed}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</Style.Resources>
<Style.Triggers>
<Trigger Property="StartFade" Value="True">
<Trigger.EnterActions>
<BeginStoryboard x:Name="In" Storyboard="{StaticResource FadeIn}" />
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard x:Name="Out" Storyboard="{StaticResource FadeOut}" />
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
您应该使用
操作停止已启动的情节提要在退出操作中播放
<Trigger Property="StartFade" Value="True">
<Trigger.EnterActions>
<StopStoryBoard BeginStoryboardName="Out"/>
<BeginStoryboard x:Name="In" Storyboard="{StaticResource FadeIn}" />
</Trigger.EnterActions>
<Trigger.ExitActions>
<StopStoryBoard BeginStoryboardName="In"/>
<BeginStoryboard x:Name="Out" Storyboard="{StaticResource FadeOut}" />
</Trigger.ExitActions>
</Trigger>
我最终在代码中使用了本地动画 在Xaml中将TextBlock不透明度设置为0
// Fading animation for the textblock to show that the settings are updated.
DoubleAnimation fadingAnimation = new DoubleAnimation();
fadingAnimation.From = 0;
fadingAnimation.To = 1;
fadingAnimation.Duration = new Duration(TimeSpan.FromSeconds(1.5));
fadingAnimation.AutoReverse = true;
UpdateMessage.BeginAnimation(TextBlock.OpacityProperty, fadingAnimation);
我基于@MystyxMac实现了自己的C#解决方案
将其提取为混合行为,这暴露了一个挑战
尝试在一行中显示同一通知两次将不起作用,因为不会调用dependency属性changed回调
我通过获取绑定、清除绑定并再次设置来克服这个问题
public class ShowFadingTextBehavior : System.Windows.Interactivity.Behavior<TextBlock>
{
public static readonly DependencyProperty DurationProperty = DependencyProperty.Register(
"Duration", typeof(TimeSpan), typeof(ShowFadingTextBehavior), new PropertyMetadata(TimeSpan.FromSeconds(5)));
public TimeSpan Duration
{
get { return (TimeSpan)GetValue(DurationProperty); }
set { SetValue(DurationProperty, value); }
}
public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
"Text", typeof (string), typeof (ShowFadingTextBehavior), new PropertyMetadata("",OnTextChanged));
private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var b = (ShowFadingTextBehavior) d;
var text = (string) e.NewValue;
if(string.IsNullOrEmpty(text))
return;
b.Show(text);
}
private void Show(string text)
{
var textBlock = AssociatedObject;
if(textBlock==null)
return;
textBlock.Text = text;
if(textBlock.Visibility==Visibility.Visible)
return;
textBlock.Visibility = Visibility.Visible;
var a = new DoubleAnimation
{
From = 1.0,
To = 0.0,
FillBehavior = FillBehavior.Stop,
BeginTime = TimeSpan.FromSeconds(1),
Duration = new Duration(Duration)
};
var storyboard = new Storyboard();
storyboard.Children.Add(a);
Storyboard.SetTarget(a, textBlock);
Storyboard.SetTargetProperty(a, new PropertyPath(UIElement.OpacityProperty));
storyboard.Completed += delegate
{
textBlock.Visibility = Visibility.Collapsed;
textBlock.Opacity = 1.0;
var binding = BindingOperations.GetBinding(this, TextProperty);
if(binding==null)
return;
ClearValue(TextProperty);
BindingOperations.SetBinding(this, TextProperty, binding);
};
storyboard.Begin();
}
public string Text
{
get { return (string) GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
}
公共类ShowFadingTextBehavior:System.Windows.Interactivity.Behavior
{
公共静态只读DependencyProperty DurationProperty=DependencyProperty.Register(
“持续时间”、typeof(TimeSpan)、typeof(ShowFadingTextBehavior)、新属性元数据(TimeSpan.FromSeconds(5));
公共时间跨度持续时间
{
获取{return(TimeSpan)GetValue(DurationProperty);}
set{SetValue(DurationProperty,value);}
}
公共静态只读DependencyProperty TextProperty=DependencyProperty.Register(
“Text”、typeof(string)、typeof(ShowFadingTextBehavior)、新PropertyMetadata(“,OnTextChanged));
私有静态void OnTextChanged(DependencyObject d、DependencyPropertyChangedEventArgs e)
{
var b=(ShowFadingTextBehavior)d;
var text=(字符串)e.NewValue;
if(string.IsNullOrEmpty(text))
返回;
b、 显示(文本);
}
私有无效显示(字符串文本)
{
var textBlock=关联对象;
if(textBlock==null)
返回;
Text=Text;
if(textBlock.Visibility==Visibility.Visibility)
返回;
textBlock.Visibility=可见性.Visibility;
var a=新动画
{
From=1.0,
To=0.0,
FillBehavior=FillBehavior.Stop,
开始时间=从秒开始的时间间隔(1),
持续时间=新的持续时间(持续时间)
};
var storyboard=新故事板();
故事板。儿童。添加(a);
故事板.SetTarget(一个文本块);
Storyboard.SetTargetProperty(一个新的PropertyPath(UIElement.OpacityProperty));
情节提要。已完成+=委托
{
textBlock.Visibility=Visibility.Collapsed;
textBlock.Opacity=1.0;
var binding=BindingOperations.GetBinding(这是TextProperty);
if(binding==null)
返回;
ClearValue(TextProperty);
BindingOperations.SetBinding(this,TextProperty,binding);
};
故事板。开始();
}
公共字符串文本
{
获取{return(string)GetValue(TextProperty);}
set{SetValue(TextProperty,value);}
}
}
我试过了,但是动画正在循环(in-out in-out in-out…)。更正。。。它只是渐渐消失了。淡出动画不工作。当不透明度达到1时,将再次开始淡入动画。一次又一次。再一次…@MystyxMac这可能是另一个问题,你的故事板正在循环。请尝试在动画上调整以下属性:AutoReverse=“True”
和RepeatBehavior=“Forever”
,谢谢您的回答,但我最终在代码中使用了本地动画。@MystyxMac如果这是您的问题解决方案,请将其作为答案发布并接受。(供其他用户将来搜索)。