WPF TextBlock 文本更改通知
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WPF TextBlock text changed notify
提问by Eran
I have a screen contain about 15-20 TextBlocks each one bind to a different property, at first all the TextBlocks are empty the text update come from other client.
我有一个包含大约 15-20 个 TextBlocks 的屏幕，每个 TextBlocks 绑定到不同的属性，起初所有 TextBlocks 都是空的，文本更新来自其他客户端。
The thing I want to do is to animate flashing text for 3 seconds when ever text change.
我想要做的是在文本更改时动画闪烁文本 3 秒。
I used the below storyboard to make that happen:
我使用下面的故事板来实现这一点：
<Setter Property="Visibility" Value="Visible"/>
<Style.Triggers>
<EventTrigger RoutedEvent="UIElement.MouseEnter">
<BeginStoryboard >
<Storyboard Duration="0:0:03">
<ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Visible}"/>
<DiscreteObjectKeyFrame KeyTime="00:00:00.5" Value="{x:Static Visibility.Hidden}"/>
<DiscreteObjectKeyFrame KeyTime="00:00:01" Value="{x:Static Visibility.Visible}"/>
<DiscreteObjectKeyFrame KeyTime="00:00:01.5" Value="{x:Static Visibility.Hidden}"/>
<DiscreteObjectKeyFrame KeyTime="00:00:02" Value="{x:Static Visibility.Visible}"/>
<DiscreteObjectKeyFrame KeyTime="00:00:02.5" Value="{x:Static Visibility.Hidden}"/>
<DiscreteObjectKeyFrame KeyTime="00:00:03" Value="{x:Static Visibility.Visible}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
Using the mouse enter event the text flash is fine but using the Binding.TargetUpdatedevent didn't trigger anything.
使用鼠标输入事件文本闪烁很好，但使用该Binding.TargetUpdated事件没有触发任何东西。
Anyone know about event that raise when the TextBlocktext is changed ?
有人知道TextBlock更改文本时引发的事件吗？
回答by Amsakanna
did you set the NotifyOnTargetUpdatedproperty to true
您是否将NotifyOnTargetUpdated属性设置为 true
<TextBlock Text="{Binding Path=YourProperty, NotifyOnTargetUpdated=True}" TargetUpdated="OnTargetUpdated"/>
回答by Rolfi
Already a bit old, but here the solution in pure xaml:
已经有点旧了，但这里是纯 xaml 的解决方案：
<TextBlock VerticalAlignment="Center"
Text="{Binding ErrorMsg, NotifyOnTargetUpdated=True}">
<TextBlock.Triggers>
<EventTrigger RoutedEvent="Binding.TargetUpdated">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation BeginTime="0:0:0"
Duration="0:0:1"
From="0.0"
Storyboard.TargetProperty="Opacity"
To="1.0" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</TextBlock.Triggers>
</TextBlock>
