Question

我有一个基本的微调器类型控件，我已经掀起了它，它运行得相当好，但整个过程中都有大量的重复代码。除了两个属性之外，它本质上是相同的元素，其中一个属性是Storyboard的BeginTime - 每一行只是无休止地重复它的动画，但每一行在前一个之后开始.1秒。小浪效应。

以下是代码的一般概念：

<UserControl x:Class="MyNamespace.Spinner"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
        <Rectangle Fill="Black" Opacity="0.5"
                   Width="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Grid}}, Path=Width}"
                   Height="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Grid}}, Path=Height}" />
        <Line X1="9" X2="11" Y1="10" Y2="20">
            <Line.Triggers>
                <EventTrigger RoutedEvent="Line.Loaded">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard RepeatBehavior="Forever" Duration="0:0:0.8"
                                        BeginTime="0:0:0.1">
                                <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">
                                    <LinearDoubleKeyFrame Value="0.5" KeyTime="0%" />
                                    <LinearDoubleKeyFrame Value="1.0" KeyTime="12.5%" />
                                    <LinearDoubleKeyFrame Value="0.5" KeyTime="75%" />
                                    <LinearDoubleKeyFrame Value="0.5" KeyTime="100%" />
                                </DoubleAnimationUsingKeyFrames>
                             </Storyboard>
                         </BeginStoryboard>
                     </EventTrigger.Actions>
                 </EventTrigger>
             </Line.Triggers>
         </Line>
        <Line X1="14" X2="16" Y1="10" Y2="20">
            <Line.Triggers>
                <EventTrigger RoutedEvent="Line.Loaded">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard RepeatBehavior="Forever" Duration="0:0:0.8"
                                        BeginTime="0:0:0.2">
                                <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">
                                    <LinearDoubleKeyFrame Value="0.5" KeyTime="0%" />
                                    <LinearDoubleKeyFrame Value="1.0" KeyTime="12.5%" />
                                    <LinearDoubleKeyFrame Value="0.5" KeyTime="75%" />
                                    <LinearDoubleKeyFrame Value="0.5" KeyTime="100%" />
                                </DoubleAnimationUsingKeyFrames>
                             </Storyboard>
                         </BeginStoryboard>
                     </EventTrigger.Actions>
                 </EventTrigger>
             </Line.Triggers>
         </Line>

    <!-- And so on and so forth, 6 more times -->
    </Grid> 
</UserControl>

我不想发布整件事，看起来可能太痛苦了，但你明白了。每一个中从Line.Triggers到/Line.Triggers的唯一变化是Storyboard的BeginTime。在XAML中是否有一种方法可以在Line中定义BeginTime，然后在Storyboard中从中读取，所以我可以做更接近的事情：

<UserControl.Resources>
    <!-- Try to read BeginTime from ancestral element -->
    <Storyboard x:Key="myStoryboard" RepeatBehavior="Forever" Duration="0:0:0.8"
                BeginTime="{Binding SomeSource, Property=StoryboardBeginTime}">
        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">
            <LinearDoubleKeyFrame Value="0.5" KeyTime="0%" />
            <LinearDoubleKeyFrame Value="1.0" KeyTime="12.5%" />
            <LinearDoubleKeyFrame Value="0.5" KeyTime="75%" />
            <LinearDoubleKeyFrame Value="0.5" KeyTime="100%" />
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>
</UserControl.Resources>
    <!-- Try to send BeginTime to storyboard contained within -->
    <Line Blah="blah" StoryboardBeginTime="0:0:0.1">
        <Line.Triggers>
            <EventTrigger>
                <EventTrigger.Actions>
                    <BeginStoryboard Storyboard="{StaticResource myStoryboard}" />
                </EventTrigger.Actions>
            </EventTrigger>
        </Line.Triggers>
    </Line>

我似乎无法追踪是否有办法在XAML中执行此操作，将故事板中的一个属性的值从树上方的元素传递给它。这种类型的东西是否可能，或者我应该在代码隐藏中代替它？如果我决定完全调整动画，那么现在做的并不是最令人愉快的事情。

谢谢！

Answer 1

似乎这是不可能的 - 虽然可能有4.0，但我没有测试这个。您可以使用代码隐藏来完成此操作。

-sa

WPF - 从父元素分配故事板开始时间

1 个答案: