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WPF DocumentViewer为XPS文档启用触摸屏滚动

  •  1
  • juFo  · 技术社区  · 7 年前

    相反,它选择文本。在触控设备上滚动的唯一方式是使用垂直滚动条。

    有没有办法通过在内容本身而不是垂直滚动条上移动手指来实现触摸滚动?

    https://stackoverflow.com/a/415155/187650 )

    1 回复  |  直到 7 年前
        1
  •  1
  •   Péter Hidvégi    6 年前

    我也有同样的问题,我提出了一个解决方案,效果很好。

    public class ManualXpsDocument : XpsDocument
    {
        private const string _uriOfDoc= "...\\path.xps";
    
        public ManualXpsDocument(FileAccess fileAccess) : base(_uriOfDoc, fileAccess)
        {
    
        }
    }
    

    以下是窗口(或控件)的xaml部分:

      <Grid.Resources>
            <ObjectDataProvider x:Key="myDataSource" MethodName="GetFixedDocumentSequence"
                                ObjectType="{x:Type manual:ManualXpsDocument}">
                <ObjectDataProvider.ConstructorParameters>
                    <io:FileAccess>Read</io:FileAccess>
                </ObjectDataProvider.ConstructorParameters>
            </ObjectDataProvider>
        </Grid.Resources>
        <DocumentViewer  x:Name="Viewer" Document="{Binding Source={StaticResource myDataSource}}">
            <DocumentViewer.Resources>
                <Style TargetType="ToolBar">
                    <Setter Property="Visibility" Value="Collapsed" />
                </Style>
                <Style TargetType="{x:Type ContentControl}">
                    <Setter Property="Visibility" Value="Collapsed" />
                </Style>
            </DocumentViewer.Resources>
            <DocumentViewer.Style>
                <Style TargetType="{x:Type DocumentViewer}">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type DocumentViewer}">
                                <controls:CustomScrollViewer x:Name="PART_ContentHost">
                                    <controls:CustomScrollViewer.Style>
                                        <Style TargetType="{x:Type ScrollViewer}">
                                            <Setter Property="Focusable" Value="false" />
                                            <Setter Property="IsDeferredScrollingEnabled" Value="True" />
                                            <Setter Property="Template">
                                                <Setter.Value>
                                                    <ControlTemplate TargetType="{x:Type ScrollViewer}">
                                                        <Border BorderBrush="#00000000"
                                                            BorderThickness="0,2,0,0">
                                                            <Grid Background="{TemplateBinding Background}"
                                                                 SnapsToDevicePixels="true">
                                                                <Grid.ColumnDefinitions>
                                                                    <ColumnDefinition Width="*" />
                                                                    <ColumnDefinition Width="Auto" />
                                                                </Grid.ColumnDefinitions>
                                                                <Grid.RowDefinitions>
                                                                    <RowDefinition Height="*" />
                                                                    <RowDefinition Height="Auto" />
                                                                </Grid.RowDefinitions>
    
                                                                <ScrollContentPresenter Name="PART_ScrollContentPresenter"
                                                                                            ScrollViewer.IsDeferredScrollingEnabled="True"
                                                                                            KeyboardNavigation.DirectionalNavigation="Local"
                                                                                            CanContentScroll="True" 
                                                                                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
    
    
                                                                <controls:CustomScrollBar Name="PART_VerticalScrollBar"
                                                                                          Style="{DynamicResource ScrollBar}"
                                                                                          Grid.Column="1"
                                                                                          Value="{TemplateBinding VerticalOffset}"
                                                                                          Maximum="{TemplateBinding ScrollableHeight}"
                                                                                          ViewportSize="{TemplateBinding ViewportHeight}"
                                                                                          Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" />
                                                                <controls:CustomScrollBar Name="PART_HorizontalScrollBar"
                                                                                          Grid.Row="1"
                                                                                          Grid.ColumnSpan="2"
                                                                                          Style="{DynamicResource ScrollBar}"
                                                                                          Orientation="Horizontal"       
                                                                                          Value="{TemplateBinding HorizontalOffset}"
                                                                                          Maximum="{TemplateBinding ScrollableWidth}"
                                                                                          ViewportSize="{TemplateBinding ViewportWidth}"
                                                                                          Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" />
                                                            </Grid>
                                                        </Border>
                                                    </ControlTemplate>
                                                </Setter.Value>
                                            </Setter>
                                        </Style>
                                    </controls:CustomScrollViewer.Style>                                 
                                </controls:CustomScrollViewer>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </DocumentViewer.Style>
        </DocumentViewer>
    

    这是xaml。窗口(或控件)的cs部分:

        public ctor()
        {
            InitializeComponent();
    
            PreviewTouchMove += ScrollingHandler;
    
        }
    
        private void ScrollingHandler(object sender, TouchEventArgs e)
        {
            TouchPoint tp = e.GetTouchPoint(Viewer);
            if (tp.Action == TouchAction.Move)
            {
                //_scrollingInt is not necessary but Move procedure of Viewer has const value to scroll and the optimalization is recommended. 
                if (_lastYPosition > tp.Position.Y + _scrollingInt)
                {
                    Viewer.MoveDown();
                    _lastYPosition = tp.Position.Y;
                }  
                else if (_lastYPosition < tp.Position.Y - _scrollingInt)
                {
                    Viewer.MoveUp();
                    _lastYPosition = tp.Position.Y;
                }
            }
    
            // Viewer.IsHitTestVisible = false; this setting can disable the selection too,but if you use this, the hyperlinks won't work too.
    
            Viewer.GetType().GetProperty("IsSelectionEnabled", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(Viewer, false, null);
    
            //set false "IsSelectionEnabled" "hidden" property instead of Viewer.IsHitTestVisible = false, because the hyperlinks will work too. 
    
            e.Handled = true;
        }
    

    ScrollingHandler方法解决了这个问题。此过程执行文档查看器的滚动并禁用选择,但超链接功能仍然可用。