使用ColorAnimation更改StackPanel背景颜色

Question

嗯，我正在尝试使用ColorAnimation更改DataTemplate中StackPanel的背景色：

    <DataTemplate DataType="{x:Type logic:Sensor}">
        <StackPanel Name="SensorPanel" MouseDown="SensorPanel_MouseDown">
        </StackPanel>
        <DataTemplate.Triggers>
            <DataTrigger Binding="{Binding Status}" Value="0">
                <!--<Setter TargetName="SensorPanel" Property="Background" Value="LawnGreen" />-->

                <DataTrigger.EnterActions>
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation 
                                Storyboard.TargetName="SensorPanel" 
                                Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"
                                To="LawnGreen" Duration="0:0:0.25" AutoReverse="True" RepeatBehavior="4">
                            </ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </DataTrigger.EnterActions>

            </DataTrigger>
        </DataTemplate.Triggers>
    </DataTemplate>

没有编译时错误。但当我运行此命令时，会抛出一个背景：“‘InvalidOperationException’属性不指向路径‘(0).(1)’中的DependencyObject。”

什么？:D

Answer 1

你的代码对我来说工作得很好。我只是做了一些小的修改。

    <DataTemplate DataType="{x:Type Model:Sensor}">
        <StackPanel Name="SensorPanel" Background="LightBlue" Width="100" Margin="5">
            <TextBlock Text="{Binding Name}"/>
            <ToggleButton Margin="2" IsChecked="{Binding IsChecked}" Content="Set status=0" />
        </StackPanel>
      <DataTemplate.Triggers>
            <DataTrigger Binding="{Binding Status}" Value="0">
                <!--<Setter TargetName="SensorPanel" Property="Background" Value="LawnGreen" />-->

                <DataTrigger.EnterActions>
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation 
                            Storyboard.TargetName="SensorPanel" 
                            Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"
                            To="LawnGreen" Duration="0:0:0.25" AutoReverse="True" RepeatBehavior="4">
                            </ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </DataTrigger.EnterActions>

            </DataTrigger>
        </DataTemplate.Triggers>
    </DataTemplate>

    <ListBox ItemsSource="{Binding Sensors}" />

Answer 2

出于文档目的：

使用(Panel.Background).(SolidColorBrush.Color)有点困难。真正的问题是ColorAnimation只适用于Color属性，而不适用于Brush。对我来说，这就是诀窍：

定义面板画笔...

<StackPanel Name="SensorPanel" MouseDown="SensorPanel_MouseDown">
    <StackPanel.Background>
        <SolidColorBrush Color="White" x:Name="PanelColor"/>
    </StackPanel.Background>
</StackPanel>

...then改为以动画形式设置SolidColorBrush的Color属性：

<ColorAnimation 
    Storyboard.TargetName="PanelColor" 
    Storyboard.TargetProperty="Color"
    To="LawnGreen" Duration="0:0:0.25" AutoReverse="True" RepeatBehavior="4">