ScrollViewer.ChangeView() 不水平滚动

Question

我正在尝试创建两个分别垂直和水平滚动的滚动查看器。

滚动应该在检测到 manipulationdelta 事件时开始，我已经使用 ChangeView 方法相应地移动滚动查看器。垂直滚动查看器还可以，但水平滚动查看器就不一样了。我添加了一个 image 来显示 2 个滚动查看器，因为我无法在此处 post 它。

代码如下：XAML

   <!--horizontal scrollviewer--> 
   <ScrollViewer x:Name="horizontalScrollViewer" 
                  Grid.Column="1"
                  Grid.RowSpan="3"
                  HorizontalScrollMode="Disabled"
                  VerticalScrollMode="Disabled">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="80"/>
                <RowDefinition Height="100"/>
                <RowDefinition Height="80"/>
            </Grid.RowDefinitions>
            <!--upperGrid-->
            <GridView Grid.Row="0"
                      ScrollViewer.HorizontalScrollMode="Disabled"
                      ScrollViewer.VerticalScrollMode="Disabled"
                      ItemsSource="{Binding dataItems}">
                <GridView.ItemsPanel>
                    <ItemsPanelTemplate>
                        <VariableSizedWrapGrid Orientation="Vertical"
                                           MaximumRowsOrColumns="1"/>
                    </ItemsPanelTemplate>
                </GridView.ItemsPanel>
                <GridView.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Height="80" Width="80" Text="{Binding}"/>
                    </DataTemplate>
                </GridView.ItemTemplate>
            </GridView>
            <!--bottomGrid-->
            <GridView Grid.Row="2"
                      ScrollViewer.HorizontalScrollMode="Disabled"
                      ScrollViewer.VerticalScrollMode="Disabled"
                      ItemsSource="{Binding dataItems}">
                <GridView.ItemsPanel>
                    <ItemsPanelTemplate>
                        <VariableSizedWrapGrid Orientation="Vertical"
                                           MaximumRowsOrColumns="1"/>
                    </ItemsPanelTemplate>
                </GridView.ItemsPanel>
                <GridView.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Height="80" Width="80" Text="{Binding}"/>
                    </DataTemplate>
                </GridView.ItemTemplate>
            </GridView>
            
        </Grid>
    </ScrollViewer>

和.cs

    private void dataGrid_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
    {
         var x = e.Delta.Translation.X;
        var y = e.Delta.Translation.Y;
        if(Math.Abs(x)> Math.Abs(y))
        {

            bool result = horizontalScrollViewer.ChangeView( horizontalScrollViewer.HorizontalOffset - x , null, null);
            result = centralScrollViewer.ChangeView(horizontalScrollViewer.HorizontalOffset - x, null, null);
            
        }
        else
        {
            bool result = centralScrollViewer.ChangeView(null, verticalScrollViewer.VerticalOffset -y, null);
            verticalScrollViewer.ChangeView(null, verticalScrollViewer.VerticalOffset - y, null);
                            
        }
    }

我在 msdn 文档中读到：

horizontalOffset Type: IReference [C++] | System.Nullable [.NET] A value between 0 and ScrollableWidth that specifies the distance the content >should be scrolled horizontally.

但是我的 ScrollableWidth 等于零，我不明白为什么。

有人知道我的代码有什么问题吗？

Answer 1

我认为您不能在滚动被禁用时滚动。如果您只是想隐藏滚动条，请执行以下操作：

<ScrollViewer x:Name="horizontalScrollViewer" 
                  Grid.Column="1"
                  Grid.RowSpan="3"
                  HorizontalScrollMode="Enabled"
                  VerticalScrollMode="Enabled"
                  HorizontalScrollBarVisibility="Hidden"
                  VerticalScrollBarVisibility="Hidden">
...
</ScrollViewer>

Answer 2

我自己找到了解决方法！

我必须在水平滚动查看器上添加 horizontalscrollbar 可见性选项。这很奇怪，因为我不需要将它添加到垂直的。无论如何，这是水平滚动查看器的代码：

<ScrollViewer x:Name="horizontalScrollViewer" 
                  Grid.RowSpan="3"
                  Grid.Column="1"
                  HorizontalScrollMode="Disabled"
                  HorizontalScrollBarVisibility="Auto"
                  VerticalScrollMode="Disabled">

ScrollViewer.ChangeView() 不水平滚动

ScrollViewer.ChangeView() does not scroll horizontally

c#

xaml

scrollviewer

windows-phone-8.1