c# – UWP Catch List查看滚动事件

1)您可以在listview中侦听PointerEntered事件

<ListView PointerEntered="PointerEntered" x:Name="PostListView" >
....
</ListView>

private void PointerEntered(object sender,PointerRoutedEventArgs e)
        {
            listScrollviewer = Scrolling(PostListView);
        }

        private ScrollViewer Scrolling(DependencyObject depObj)
        {
            ScrollViewer foundOne = GetScrollViewer(depObj);
            if (foundOne != null)
            {
                //    if (foundOne.VerticalOffset == 0)
                //    //refresh.Visibility = Visibility.Visible;
                //    else
                //refresh.Visibility = Visibility.Collapsed;
                foundOne.ViewChanging += foundOne_ViewChanging;
            }


            return foundOne;
        }

        public static ScrollViewer GetScrollViewer(DependencyObject depObj)
        {
            if (depObj is ScrollViewer) return depObj as ScrollViewer;

            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
            {
                var child = VisualTreeHelper.GetChild(depObj,i);

                var result = GetScrollViewer(child);
                if (result != null) return result;
            }
            return null;
        }

        private void foundOne_ViewChanging(object sender,ScrollViewerViewChangingEventArgs e)
        {
          //YOur logic to hide the button
          if (e.NextView.VerticalOffset == 0)
            {
            }
           else
           {
              //Hide the button
           }

        }

2)第二种方式是编辑列表视图样式.在那里你会得到滚动查看器

<ListView  Style="{StaticResource ListViewStyle1}">
...
</ListView>

<Style x:Key="ListViewStyle1" TargetType="ListView">
            <Setter Property="IsTabStop" Value="False"/>
            <Setter Property="TabNavigation" Value="Once"/>
            <Setter Property="IsSwipeEnabled" Value="True"/>
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            <Setter Property="VerticalContentAlignment" Value="Bottom"/>
            <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled"/>
            <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
            <Setter Property="ScrollViewer.HorizontalScrollMode" Value="Disabled"/>
            <Setter Property="ScrollViewer.VerticalScrollMode" Value="Auto"/>
            <Setter Property="ScrollViewer.ZoomMode" Value="Disabled"/>
            <Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False"/>
            <Setter Property="ScrollViewer.BringIntoViewOnFocusChange" Value="True"/>
            <Setter Property="ItemContainerTransitions">
                <Setter.Value>
                    <TransitionCollection>
                        <AddDeleteThemeTransition/>
                        <ReorderThemeTransition/>
                    </TransitionCollection>
                </Setter.Value>
            </Setter>
            <Setter Property="ItemsPanel">
                <Setter.Value>
                    <ItemsPanelTemplate>
                        <ItemsStackPanel Orientation="Vertical"/>
                    </ItemsPanelTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListView">
                        <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}">
                            <ScrollViewer x:Name="ScrollViewer" AutomationProperties.AccessibilityView="Raw" BringIntoViewOnFocusChange="{TemplateBinding ScrollViewer.BringIntoViewOnFocusChange}" HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}" HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}" IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}" IsHorizontalScrollChainingEnabled="{TemplateBinding ScrollViewer.IsHorizontalScrollChainingEnabled}" IsVerticalScrollChainingEnabled="{TemplateBinding ScrollViewer.IsVerticalScrollChainingEnabled}" IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}" IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}" TabNavigation="{TemplateBinding TabNavigation}" VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}" VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}" ZoomMode="{TemplateBinding ScrollViewer.ZoomMode}">
                                <ItemsPresenter FooterTransitions="{TemplateBinding FooterTransitions}" FooterTemplate="{TemplateBinding FooterTemplate}" Footer="{TemplateBinding Footer}" HeaderTemplate="{TemplateBinding HeaderTemplate}" Header="{TemplateBinding Header}" HeaderTransitions="{TemplateBinding HeaderTransitions}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </ScrollViewer>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>