FitToPage on RadPdfViewer doesnt work.

[Dustin]

The error I'm havnig is that the RadViewer will not fit the container that it sits in.  This is going off the assumption that the ScaleMode="FitToPage" fits the parents containers width and height.  Currently the pdf is not fitting to the parent window or even if I set the width and height of the RadPdfViewer itself it still seems to try to display it with no scaling applied.  Attached is how it currently looks.

<Window x:Class="Views.Dialogs.TelerikPdfDialog"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        WindowStartupLocation="CenterOwner"
        ShowInTaskbar="False"
        AllowsTransparency="False"
        ResizeMode="NoResize"
        WindowStyle="None"
        mc:Ignorable="d"
        Title="TelerikPdfDialog" MaxWidth="800" MaxHeight="1000">
    



        <Window.Resources>

            <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="../../Resources/Styles.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
        </Window.Resources>


        <Border BorderBrush="Black" BorderThickness="10">
            <Grid Background="{StaticResource gsiBackgroundBrush}" >
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>
                
                <Grid Grid.Row="0">
                    <Label HorizontalContentAlignment="Center" Margin="10" FontSize="38" Content="Hearing Test Results"/>
                </Grid>
            <ContentControl Grid.Row="1" x:Name="contentView" Height="350" Width="700" Background="Blue">

                <telerik:RadPdfViewer x:Name="pdfViewer"  ScaleMode="FitToPage" DocumentSource="{Binding PatientPdfPath}"/>

            </ContentControl>

            <Grid Grid.Row="2">
                <Grid VerticalAlignment="Bottom" Margin="0 10">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="2*" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>

                        <DockPanel Grid.Column="1"  >
                            <Button HorizontalAlignment="Left" Content="Print" Height="35" Width="85"/>
                            <Button Click="Click_Close"   HorizontalAlignment="Right" Content="Cancel" Height="35" Width="85" />
                        </DockPanel>

                    </Grid>
                </Grid>

            </Grid>
        </Border>

</Window>

[Dustin]

I forgot to attach the picture

[Dinko | Tech Support Engineer]

Hello Dustin,

You can try using the FitToPageFixedDocumentSinglePageViewPresenterCommandDescriptor. Basically, you can subscribe to the DocumentChanged event of the RadPdfViewer. In its handler, you can execute the FitToPageFixedDocumentSinglePageViewPresenterCommandDescriptor.

private void pdfViewer_DocumentChanged(object sender, Telerik.Windows.Documents.Fixed.DocumentChangedEventArgs e)
{
    var pdf = sender as RadPdfViewer;
    pdf.CommandDescriptors.FitToPageFixedDocumentSinglePageViewPresenterCommandDescriptor.Command.Execute(null);
}

Hope this information is helpful.

Regards,
Dinko
Telerik by Progress

[David]

Hi,

I've followed the suggestion in Dinko's answer, however, I am getting the following error:

"An exception of type 'System.NullReferenceException' occurred in Telerik.Windows.Controls.FixedDocumentViewers.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object."

I'm guessing that this is some kind of timing issue because if I put a break point into DocumentChanged event and wait for a bit, it works.

Any ideas?

Regards

David

[David]

Hi,

Don't worry about this.... I figured it out.

In my window, the Visibilty property of the RadPdfViewer is set to Collapsed until the DocumentSource is set to the PdfDocumentSource. It dawned on me that the scaling needs to know the size of the viewer and I'm guessing that this wasn't always getting set by the time the DocumentChanged event happened. Tried a few things (including the Command.CanExecuteChanged but this didn't help(?),) so finally used RadPdfViewer.SizeChanged. This worked.

 

[Anna]

Hi David,

I am glad you found a solution which has solved the issue for you. In the meantime we were able to identify a null reference exception in the scenario you described in your first post. We should release a fix in one of the following LIBs, so your initial implementation should also work. Of course, please, let us know if you encounter further problems.

Regards,
Anna
Progress Telerik

[Scott]

Was this resolved in later builds?  I'm getting the same exception when running the suggested code.

[Tanya]

Hi Scott,

Yes, a fix is already included in the latest internal build versions and will be also available in the next official release - R2 2019, expected in mid-May. You can test it and please, don't hesitate to let us know if you experience any further issues.

Regards,
Tanya
Progress Telerik