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);

            }

        }

    }

}