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我正在尝试在我的应用程序中添加选取框文本动画，我有两个小问题。文本来自 sqlite Db。

  1. 动画速度 - 如果文本 leighs 不同或文本更改，我如何为 ListView 中的所有选取框文本设置相同的速度？

2）当 UI 启动时，所有文本在起点一起显示并在结束时一起消失，但如果文本大小发生变化，那么一些文本会在中间或接近终点消失。或者有时一个文本已经消失但没有重新启动，而另一个文本没有到达终点。

在此处输入图像描述

.Xaml：

            <ListView ItemsSource="{Binding Contacts}"
                          SelectedItem="{Binding SelectedContact}"                                                
                    ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                      Background="#FF2F3136"
                      BorderThickness="0"
                      Grid.Row="0"
                ItemContainerStyle="{StaticResource ContactCard}">
                <ListView.Resources>
                    <Style TargetType="Label">
                        <EventSetter Event="MouseRightButtonUp" Handler="OnMouseRightButtonUp"/>
                        <Style.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </ListView.Resources>
                <ListView.ItemsPanel>
                    <ItemsPanelTemplate>
                        <!--<StackPanel Orientation="Horizontal" />-->
                        <WrapPanel />
                    </ItemsPanelTemplate>
                </ListView.ItemsPanel>
                <!--end-->
            </ListView>

名片主题

                                <StackPanel Orientation="Horizontal" x:Name="stack" 
                                                >
                                   <StackPanel.Resources>
                                        <local:NegatingConverter x:Key="NegatingConverter" />
                                        <Storyboard x:Key="slide">
                                            <DoubleAnimation From="90" To="{Binding Text, 
                                                ElementName=txtKron,
                                                Converter={StaticResource NegatingConverter}}" Duration="00:00:06"
                                                Storyboard.TargetProperty="X"
                                                Storyboard.TargetName="transferCurreny"
                                                RepeatBehavior="Forever"/>
                                        </Storyboard>
                                    </StackPanel.Resources>
                                    <StackPanel.RenderTransform>
                                        <TranslateTransform x:Name="transferCurreny" X="0"/>
                                    </StackPanel.RenderTransform>
                                    <StackPanel.Triggers>
                                        <EventTrigger RoutedEvent="StackPanel.Loaded">
                                            <BeginStoryboard Storyboard="{StaticResource slide}" />
                                        </EventTrigger>
                                        <EventTrigger RoutedEvent="StackPanel.SizeChanged">
                                            <BeginStoryboard Storyboard="{StaticResource slide}" />
                                        </EventTrigger>
                                    </StackPanel.Triggers>
                                    <Canvas x:Name="canvas" Width="90">
                                        <TextBlock Text="{Binding Message1}" FontSize="12" Foreground="White"  x:Name="txtKron" Canvas.Left="0" Canvas.Top="1"/>
                                    </Canvas>
                                </StackPanel>

否定转换器

    public class NegatingConverter : IValueConverter
    {

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {

            if (value is string)
            {
                return -(value.ToString().Length * 6);
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is double)
            {
                return +(double)value;
            }
            return value;
        }
    }
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