ScaleFactor NOT working

[David Ellams]

Greetings,


I have been evaluating your excellent RadPDFViewer control which I am pleased with.

But the ScaleFactor does not appear to be working? I set in code and nothing happens. I also set it in the DocumentChanged event as you suggest and still nothing?

I hope you can help us?

Any help would be greatly appreciated.

This is really urgent since I am a freelance contractor working on a short-term project and the client needs a very quick turn around, ideally before my contract ends very soon! :)

Many thanks,
David.
P.S. It also appears REALLY slow when used in a frame, has anyone else seen this?

[Wenjie]

try this.

<Window x:Class="WpfApplication99.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="ScaleFactor"></TextBlock>
            <TextBox Width="50" Margin="30,0,0,0" Text="{Binding ElementName=c1PdfViewer1, Path=ScaleFactor,Mode=OneWay}"></TextBox>
            <TextBlock  Margin="30,0,0,0" Text="change ScaleFactor by hardcode" ></TextBlock>
            <Button Margin="30,0,0,0" Width="50" Click="Button_Click"></Button>
        </StackPanel>
        <ToolBarTray UseLayoutRounding="False" Background="sc#1.000000, 0.769689, 0.831936, 1.000000" Grid.Row="1" >
            <ToolBar DataContext="{Binding ElementName=c1PdfViewer1, Path=Commands}" >
                <Button Width="40" ToolBar.OverflowMode="AsNeeded" Content="Load" HorizontalAlignment="Left" VerticalAlignment="Stretch" Margin="2" Padding="0" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Click="btnLoadFile_Click" >
                    <ToolTipService.ToolTip>
                        <TextBlock Text="Open" />
                    </ToolTipService.ToolTip>

                </Button>
                <telerik:RadButton Command="{Binding ZoomInCommand}" HorizontalAlignment="Left" VerticalAlignment="Stretch" Margin="2" Padding="0" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" IsBackgroundVisible="False">
                <ToolTipService.ToolTip>
                    <TextBlock Text="Zoom in" />
                </ToolTipService.ToolTip>
                <Image Source="/Telerik.Windows.Controls.FixedDocumentViewers;component/Images/zoom-in.png" Stretch="None" />
            </telerik:RadButton>
            <telerik:RadButton x:Name="PART_btnZoomOut" Command="{Binding ZoomOutCommand}" HorizontalAlignment="Left" VerticalAlignment="Stretch" Margin="2" Padding="0" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" IsBackgroundVisible="False">
                <ToolTipService.ToolTip>
                    <TextBlock Text="Zoom out" />
                </ToolTipService.ToolTip>
                <Image Source="/Telerik.Windows.Controls.FixedDocumentViewers;component/Images/zoom-out.png" Stretch="None" />
                </telerik:RadButton>
            </ToolBar>
        </ToolBarTray>
        <telerik:RadPdfViewer Name="c1PdfViewer1" Grid.Row="2"  DocumentChanged="c1PdfViewer1_DocumentChanged" >
        </telerik:RadPdfViewer>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication99
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void btnLoadFile_Click(object sender, RoutedEventArgs e)
        {
            e.Handled = true;

            string strPdfFilenName = "";
            var dlg = new Microsoft.Win32.OpenFileDialog();
            dlg.Filter = "PDF files (*.pdf)|*.pdf";

            if (dlg.ShowDialog().Value)
            {
                strPdfFilenName = dlg.FileName;

                System.IO.FileStream fstreamLoaded = new System.IO.FileStream(strPdfFilenName, System.IO.FileMode.Open, System.IO.FileAccess.Read);

                System.IO.MemoryStream mstreamPdfShow = new System.IO.MemoryStream();

                fstreamLoaded.CopyTo(mstreamPdfShow);

                Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider prvdPdfPrint = new Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider(mstreamPdfShow, Telerik.Windows.Documents.Fixed.FormatProviders.FormatProviderSettings.ReadAllAtOnce);

                this.c1PdfViewer1.Document = prvdPdfPrint.Import();

            }

        }

        private void c1PdfViewer1_DocumentChanged(object sender, EventArgs e)
        {

            if (c1PdfViewer1.Document != null)
            {
                this.c1PdfViewer1.ScaleFactor = 2.0;

            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (c1PdfViewer1.Document != null)
            {
                this.c1PdfViewer1.ScaleFactor = 1;

            }
        }
    }
}

[Petya]

Hi David,

As far as we are aware the ScaleFactor property of RadPdfViewer works fine. It is indeed recommended to place it in the DocumentChanged event handler (as in the snippet pasted by Wanjie) when you want the same scale factor to be set for each document loaded in the viewer. In case you are having troubles with this, please share additional details on your setup.

Furthermore, we are unaware of any performance issues at this point, so we will highly appreciate if you open a support ticket and attach your project, so that we can troubleshoot it on our side.

We are looking forward to your reply.

Regards,
Petya
Telerik