Disable scrolling in the RadPdfViewer

Environment

Product Version	2020.2.820
Product	RadPDFViewer for WPF

Description

How to disable scrolling in the RadPdfViewer.

Solution

This functionality can be achieved by creating and using a template where the ScrollBar's (both horizontal and vertical) Visibility is set to Collapsed. Then in the code behind setting all command descriptors related to scrolling to false and handle all the related events. Check the following code snippets:

__ Creating a template and setting it to the RadPdfViewer

• XAML

<Window.Resources> 
    <ControlTemplate x:Key="FixedDocumentViewerBaseTemplate" TargetType="controlViewers:FixedDocumentViewerBase"> 
        <telerik:RadBusyIndicator x:Name="PART_BusyIndicator"> 
            <Grid Background="{TemplateBinding Background}"> 
                <Grid.RowDefinitions> 
                    <RowDefinition/> 
                    <RowDefinition Height="0"/> 
                </Grid.RowDefinitions> 
                <Grid.ColumnDefinitions> 
                    <ColumnDefinition/> 
                    <ColumnDefinition Width="0"/> 
                </Grid.ColumnDefinitions> 
                <ContentPresenter x:Name="PART_ContentPresenter" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/> 
                <ScrollBar Grid.Column="1" x:Name="PART_VerticalScrollBar" Orientation="Vertical" Visibility="Collapsed"/> 
                <ScrollBar Grid.Row="1" x:Name="PART_HorizontalScrollBar" Orientation="Horizontal" Visibility="Collapsed"/> 
            </Grid> 
        </telerik:RadBusyIndicator> 
    </ControlTemplate> 
    <Style x:Key="RadPdfViewerStyle" TargetType="controlViewers:RadPdfViewer"> 
        <Setter Property="VerticalContentAlignment" Value="Stretch"/> 
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/> 
        <Setter Property="VerticalAlignment" Value="Stretch"/> 
        <Setter Property="HorizontalAlignment" Value="Stretch"/> 
        <Setter Property="Template" Value="{StaticResource FixedDocumentViewerBaseTemplate}"/> 
        <Setter Property="UseLayoutRounding" Value="True"/> 
        <Setter Property="SnapsToDevicePixels" Value="True"/> 
    </Style> 
</Window.Resources> 
 
<Grid PreviewMouseWheel="Grid_PreviewMouseWheel" PreviewMouseMove="Grid_PreviewMouseMove"> 
    <Grid.RowDefinitions> 
        <RowDefinition Height="Auto"/> 
        <RowDefinition Height="*"/> 
    </Grid.RowDefinitions> 
 
    <telerik:RadToolBar DataContext="{Binding ElementName=pdfViewer, Path=CommandDescriptors}"> 
        <telerik:RadButton Content="Open File" Command="{Binding OpenCommandDescriptor.Command}" HorizontalAlignment="Left" VerticalAlignment="Stretch" Margin="2" Padding="0" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" IsBackgroundVisible="False"> 
            <ToolTipService.ToolTip> 
                <TextBlock Text="Open" /> 
            </ToolTipService.ToolTip> 
        </telerik:RadButton> 
    </telerik:RadToolBar> 
 
    <telerik:RadPdfViewer Grid.Row="1" x:Name="pdfViewer" DataContext="{Binding ElementName=pdfViewer, Path=CommandDescriptors}" Style="{StaticResource RadPdfViewerStyle}" /> 
</Grid> 

__ Disable commands related to scrolling and handle the related events

• C#

public MainWindow() 
{ 
    InitializeComponent(); 
 
    this.pdfViewer.CommandDescriptors.MoveDownCommandDescriptor.IsEnabled = false; 
    this.pdfViewer.CommandDescriptors.MoveUpCommandDescriptor.IsEnabled = false; 
    this.pdfViewer.CommandDescriptors.MoveRightCommandDescriptor.IsEnabled = false; 
    this.pdfViewer.CommandDescriptors.MoveLeftCommandDescriptor.IsEnabled = false; 
    this.pdfViewer.CommandDescriptors.PageDownCommandDescriptor.IsEnabled = false; 
    this.pdfViewer.CommandDescriptors.PageUpCommandDescriptor.IsEnabled = false; 
} 
 
private void Grid_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e) 
{ 
    e.Handled = true; 
 
} 
 
private void Grid_PreviewMouseMove(object sender, System.Windows.Input.MouseEventArgs e) 
{ 
    if (this.pdfViewer.Mode == Telerik.Windows.Documents.Fixed.UI.FixedDocumentViewerMode.Pan) 
    { 
        e.Handled = true; 
    } 
} 

Notes

There is a request to expose an API that allows users to control this functionality easier. Make sure to cast your vote for it as this directly affects its priority: PdfViewer: Introduce an easy way to disable the scrolling.