WPF 超长文本的来回滚动

原文:WPF 超长文本的来回滚动

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Vblegend_2013/article/details/83621303

当较小的地方显示超长的文本时  实现左右来回滚动

 

引入命名空间

xmlns:Utility="clr-namespace:Test.Wpf.Utility"

 实现

<ScrollViewer Name="slv"
          IsHitTestVisible="False"
          Background="#05FFFFFF"
          Margin="2,10,2,0"
          VerticalScrollBarVisibility="Hidden"
          HorizontalScrollBarVisibility="Hidden">
    <Label Content="{Binding Title, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
       VerticalContentAlignment="Center"
       HorizontalContentAlignment="Center"
       FontSize="18"
       FontFamily="Microsoft YaHei"
       Foreground="#FFFFFFFF"
       Margin="5,0,5,0">
        <Label.Triggers>
            <EventTrigger RoutedEvent="Label.Loaded">
                <BeginStoryboard HandoffBehavior="Compose">
                    <Storyboard>
                        <DoubleAnimation From="0"
                            To="{Binding ElementName=slv,Path=ScrollableWidth}"
                            Duration="0:0:2"
                            Storyboard.TargetName="slv"
                            AutoReverse="True"
                            RepeatBehavior="Forever"
                            BeginTime="0:0:0.2"
                            Storyboard.TargetProperty="(Utility:ScrollViewerBehavior.HorizontalOffset)">
                        </DoubleAnimation>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
        </Label.Triggers>
    </Label>
</ScrollViewer>

ScrollViewerBehavior类

using System.Windows;
using System.Windows.Controls;

namespace Test.Wpf.Utility
{
    public static class ScrollViewerBehavior
    {
        public static readonly DependencyProperty HorizontalOffsetProperty = DependencyProperty.RegisterAttached("HorizontalOffset", typeof(double), typeof(ScrollViewerBehavior), new UIPropertyMetadata(0.0, OnHorizontalOffsetChanged));
        public static void SetHorizontalOffset(FrameworkElement target, double value)
        {
            target.SetValue(HorizontalOffsetProperty, value);
        }
        public static double GetHorizontalOffset(FrameworkElement target)
        {
            return (double)target.GetValue(HorizontalOffsetProperty);
        }
        private static void OnHorizontalOffsetChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
        {
            var view = target as ScrollViewer;
            if (view != null)
            {
                view.ScrollToHorizontalOffset((double)e.NewValue);
            }
        }

        public static readonly DependencyProperty VerticalOffsetProperty = DependencyProperty.RegisterAttached("VerticalOffset", typeof(double), typeof(ScrollViewerBehavior), new UIPropertyMetadata(0.0, OnVerticalOffsetChanged));
        public static void SetVerticalOffset(FrameworkElement target, double value)
        {
            target.SetValue(VerticalOffsetProperty, value);
        }
        public static double GetVerticalOffset(FrameworkElement target)
        {
            return (double)target.GetValue(VerticalOffsetProperty);
        }
        private static void OnVerticalOffsetChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
        {
            var view = target as ScrollViewer;
            if (view != null)
            {
                view.ScrollToVerticalOffset((double)e.NewValue);
            }
        }
    }
}