如何使WPF中文字块闪烁？ [英] How to make a textblock blink in wpf?

问题描述

我创造的WPF和一群关键绩效指标，其中每一个由三​​个值的仪表板。

I am creating a dashboard in WPF with a bunch of key performance indicators, each of which consists of three values.

每当值的变化，我想用户控件闪烁5秒。我想使控制的背景色切换文本块的前景色，与文本块前景色更改为用户控件的背景颜色。

Whenever the values change I would like the user control to blink for 5 seconds. I would like to make the background color of the control to switch the foreground color of the textblock, and the textblock foreground color to change to the background color of the user control.

这整个WPF动画是新的给我，所以任何帮助将非常AP preciated！

This whole WPF animation is new to me, so any help would be much appreciated!

我的用户控件如下：

    

    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="10" />
        <RowDefinition Height="Auto" />
        <RowDefinition Height="10" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>

    <TextBlock x:Name="TitleTextBlock" Text="Title" FontSize="32" HorizontalAlignment="Center" Grid.Row="0" FontFamily="OCR-A II" Foreground="White" VerticalAlignment="Bottom" />
    <TextBlock x:Name="Value1TextBlock" Text="0" FontSize="192" HorizontalAlignment="Center" Grid.Row="2" FontFamily="OCR-A II" VerticalAlignment="Center" Foreground="White" />
    <TextBlock x:Name="Value2TextBlock" Text="0" FontSize="32" HorizontalAlignment="Center" Grid.Row="4" FontFamily="OCR-A II" Foreground="White" VerticalAlignment="Top" />

</Grid>

推荐答案

要做出一个TextBlock闪烁时，其文本更改，您可以使用ColorAnimationUsingKeyFrames。文本绑定到一个名为TextTitle属性。

To make a TextBlock blink when its Text Changes you can use ColorAnimationUsingKeyFrames. Text is binding to a property called TextTitle.

<Window.Resources>
    <Storyboard x:Key="blinkAnimation" Duration="0:0:5" >
        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(TextBlock.Background).(SolidColorBrush.Color)"
                                      Storyboard.TargetName="TitleTextBlock"
                                      AutoReverse="True">
            <ColorAnimationUsingKeyFrames.KeyFrames>
                <DiscreteColorKeyFrame KeyTime="0:0:0" Value="White"/>
                <DiscreteColorKeyFrame KeyTime="0:0:1" Value="Black"/>
                <DiscreteColorKeyFrame KeyTime="0:0:2" Value="White"/>
                <DiscreteColorKeyFrame KeyTime="0:0:3" Value="Black"/>
                <DiscreteColorKeyFrame KeyTime="0:0:4" Value="White"/>
            </ColorAnimationUsingKeyFrames.KeyFrames>
        </ColorAnimationUsingKeyFrames>

        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(TextBlock.Foreground).(SolidColorBrush.Color)"
                                      Storyboard.TargetName="TitleTextBlock"
                                      AutoReverse="True">
            <ColorAnimationUsingKeyFrames.KeyFrames>
                <DiscreteColorKeyFrame KeyTime="0:0:0" Value="Black"/>
                <DiscreteColorKeyFrame KeyTime="0:0:1" Value="White"/>
                <DiscreteColorKeyFrame KeyTime="0:0:2" Value="Black"/>
                <DiscreteColorKeyFrame KeyTime="0:0:3" Value="White"/>
                <DiscreteColorKeyFrame KeyTime="0:0:4" Value="Black"/>
            </ColorAnimationUsingKeyFrames.KeyFrames>
        </ColorAnimationUsingKeyFrames>
    </Storyboard>
</Window.Resources>

<Grid Name="grid" Background="Black">
    <TextBlock x:Name="TitleTextBlock" Text="{Binding TextTitle, NotifyOnTargetUpdated=True}" FontSize="32" HorizontalAlignment="Center" Grid.Row="0" FontFamily="OCR-A II" Foreground="White" VerticalAlignment="Bottom" Background="Black">
        <TextBlock.Triggers>
            <EventTrigger RoutedEvent="Binding.TargetUpdated">
                <EventTrigger.Actions>
                    <BeginStoryboard>
                        <StaticResource ResourceKey="blinkAnimation"/>
                    </BeginStoryboard>
                </EventTrigger.Actions>
            </EventTrigger>
        </TextBlock.Triggers>    
    </TextBlock>
</Grid>

这会使眨眼的TextBlock每次其Text变化。请注意，您必须在文本块设置背景和前景明确使用blinkAnimation之前，否则你会收到一个System.InvalidOperationException：背景属性不指向DependencyObject的路径。（0）（1）

This will make the TextBlock blink everytime its Text changes. Note that you must set Background and Foreground explicitly on the TextBlock before using the blinkAnimation, otherwise you'll recieve a System.InvalidOperationException: 'Background' property does not point to a DependencyObject in path '(0).(1)'.

更新

要开始从code此动画的背后，你可以做到这一点。

To start this animation from code behind you can do this.

Storyboard blinkAnimation = TryFindResource("blinkAnimation") as Storyboard;
if (blinkAnimation != null)
{
    blinkAnimation.Begin();
}

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