WPF之数据触发器 改变控件背景色或闪烁

Posted 2020-10-03 Sunny秋刀鱼

需求，很多矩形表示桶，其中：空桶=红色，满桶=绿色，使用中=红绿闪烁。

<Window x:Class="FlickerDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:FlickerDemo"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <Style TargetType="Label">
            <Style.Triggers>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self},Path=Tag}" Value="0">
                    <Setter Property="Background"
                        Value="Green"></Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self},Path=Tag}" Value="1">
                    <Setter Property="Background"
                        Value="Red"></Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self},Path=Tag}" Value="2">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard Name="Shine">
                            <Storyboard RepeatBehavior="Forever">
                                <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="Background.Color">
                                    <EasingColorKeyFrame KeyTime="0" Value="Red"></EasingColorKeyFrame>
                                    <EasingColorKeyFrame KeyTime="0:0:0.5" Value="Green"></EasingColorKeyFrame>
                                </ColorAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                    <DataTrigger.ExitActions>
                        <StopStoryboard BeginStoryboardName="Shine" />
                    </DataTrigger.ExitActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <StackPanel HorizontalAlignment="Center">
            <Label Tag="0" Margin="5" Width="81" Height="45"  Foreground="White"/>
            <Label Tag="1" Margin="5" Width="81" Height="45" Foreground="White"/>
            <Label Tag="2"  Margin="5"  Width="81" Background="Green" Height="45"  Foreground="White"/>
        </StackPanel>
    </Grid>
</Window>

 

运行截图：