使用数据触发器为线性画笔设置动画

Question

我试图使用数据触发器在边框上设置线性画笔动画但是遇到了无法使用TargetName的问题

我的代码如下,任何人都可以建议一种解决方法吗？

<Border Grid.Row="2" BorderThickness="10" Height="100" Width="100" >
    <Border.BorderBrush>
        <LinearGradientBrush>
            <GradientStop Color="Yellow" Offset="0.0" />
            <GradientStop x:Name="gradient" Color="Orange"  Offset="0.5" />
            <GradientStop Color="Yellow" Offset="1.0" />
        </LinearGradientBrush>
    </Border.BorderBrush>
    <Border.Resources>
        <Style TargetType="Border">
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=testBrdrWin, Path=Pulse}" Value="true">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation
                                    Storyboard.TargetName="gradient"
                                    Storyboard.TargetProperty="Offset"
                                    From="0" To="1" Duration="0:0:1"
                                    AutoReverse="True" RepeatBehavior="Forever"
                                    />
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                </DataTrigger>
                <DataTrigger Binding="{Binding ElementName=testBrdrWin, Path=Pulse}" Value="true">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation
                                    Storyboard.TargetName="gradient"
                                    Storyboard.TargetProperty="Offset"
                                    To="0.5" Duration="0:0:01"
                                    AutoReverse="False"
                                    />
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Border.Resources>
</Border>

谢谢

Answer 1

1. 你不能Storyboard.TargetName在这里使用.你必须使用完整的PropertyPath Syntax.
2. LinearGradientBrush必须是Style自己.

在这个示例代码中,我已经删除了所有特殊的东西,因此如果你MouseOver的话,它也可以独立工作Border.再次适应您的需求.

<Border BorderThickness="10" Height="100" Width="100" >
    <Border.Resources>
        <Style TargetType="Border">
            <Setter Property="BorderBrush">
                <Setter.Value>
                    <LinearGradientBrush>
                        <GradientStop Color="Yellow" Offset="0.0" />
                        <GradientStop Color="Red" Offset="0.5" />
                        <GradientStop Color="Yellow" Offset="1.0" />
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="true">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation
                                Storyboard.TargetProperty="BorderBrush.(GradientBrush.GradientStops)[1].(GradientStop.Offset)"
                                From="0" To="1" Duration="0:0:1"
                                AutoReverse="True" RepeatBehavior="Forever"
                                />
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Border.Resources>
</Border>