Take the following steps to start a project and to add some code that will demonstrate the various interactive modes of the LEADTOOLS Silverlight Control and the Pan Viewer:

1. Start Visual Studio .NET.
2. Start with the project that you created in Loading and displaying an image in Silverlight.
3. Open the Page.xaml file and copy the below xaml code into the editor:

   [XAML]

   
   <UserControl x:Class="Load_And_Display.Page"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:Leadtools_Silverlight_Controls="clr-namespace:Leadtools.Silverlight.Controls;assembly=Leadtools.Silverlight3.Controls"
     Width="800" Height="600">
     <Grid x:Name="LayoutRoot" Background="White">
       <Grid.ColumnDefinitions>       
           <ColumnDefinition Width="5*"/>
           <ColumnDefinition Width="2*"/>
       </Grid.ColumnDefinitions>
       
       <ScrollViewer VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Disabled" Grid.Column="0">
           <StackPanel Orientation="Vertical" >
               <Button Name="myButton" Content="Load" FontSize="30" Click="Button_Click" Height="40"></Button>
               <Leadtools_Silverlight_Controls:ImageViewer x:Name="viewerControl" SizeMode="Normal" Height="550"></Leadtools_Silverlight_Controls:ImageViewer> 
           </StackPanel>
       </ScrollViewer>
       
       <ScrollViewer VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Disabled" Grid.Column="1">
           <StackPanel Orientation="Vertical" >
               <TextBlock Text="Pan Window :"/>
               <Leadtools_Silverlight_Controls:ImagePanViewer x:Name="_imagePanViewer" Width="150" Height="150" HorizontalAlignment="Left"></Leadtools_Silverlight_Controls:ImagePanViewer>
               <TextBlock Text="Interactive Mode :"/>
               <ComboBox Name="_cmbInteractiveMode" SelectedIndex="0" Width="200" HorizontalAlignment="Left" SelectionChanged="ComboBox_SelectionChanged">
                   <ComboBoxItem Content="None"/>
                   <ComboBoxItem Content="Pan"/>
                   <ComboBoxItem Content="Center At"/>
                   <ComboBoxItem Content="Zoom To"/>
                   <ComboBoxItem Content="Scale"/>
                   <ComboBoxItem Content="Magnify Glass"/>
               </ComboBox>
           </StackPanel>
       </ScrollViewer>    
     </Grid>
   </UserControl>
   

4. Switch to Page.xaml code view (right-click Page.xaml in the solution explorer then select View Code) and add the following class function:

   [Visual Basic]

   
   Private Sub ComboBox_SelectionChanged(ByVal sender As Object, ByVal e As SelectionChangedEventArgs)
     If _cmbInteractiveMode Is Nothing OrElse _cmbInteractiveMode.SelectedItem Is Nothing Then
        Return
     End If
   
     Dim item As String = (CType(IIf(TypeOf _cmbInteractiveMode.SelectedItem Is ComboBoxItem, _cmbInteractiveMode.SelectedItem, Nothing), ComboBoxItem)).Content.ToString()
   
     Select Case item
        Case "Pan"
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.Pan
   
        Case "Center At"
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.CenterAt
   
        Case "Magnify Glass"
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.MagnifyGlass
   
        Case "Scale"
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.Scale
   
        Case "Zoom To"
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.ZoomTo
   
        Case Else
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.None
     End Select
   End Sub
   

   [C#]

   
   private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
   {
     if (_cmbInteractiveMode == null || _cmbInteractiveMode.SelectedItem == null)
        return;
   
     string item = (_cmbInteractiveMode.SelectedItem as ComboBoxItem).Content.ToString();
   
     switch (item)
     {
        case "Pan":
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.Pan;
           break;
   
        case "Center At":
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.CenterAt;
           break;
   
        case "Magnify Glass":
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.MagnifyGlass;
           break;
   
        case "Scale":
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.Scale;
           break;
   
        case "Zoom To":
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.ZoomTo;
           break;
   
        default:
           viewerControl.InteractiveMode = Leadtools.Silverlight.Controls.ImageViewerInteractiveMode.None;
           break;
     }
   }
   

5. Update the Button_Click event as shown below:

   [Visual Basic]

   
   Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
     Try  
        Dim ofd As OpenFileDialog = New OpenFileDialog()
        If ofd.ShowDialog() = True Then
           Dim fileStream As FileStream = ofd.File.OpenRead()
           Dim bi As BitmapImage = New BitmapImage()
           bi.SetSource(fileStream)
           viewerControl.Source = bi
           _imagePanViewer.Source = viewerControl
           fileStream.Close()
        End If
     Catch ex As Exception
        MessageBox.Show(ex.Message)
     End Try
   End Sub
   

   [C#]

   
   private void Button_Click(object sender, RoutedEventArgs e)
   {
     try
     {
        OpenFileDialog ofd = new OpenFileDialog();
        if (ofd.ShowDialog() == true)
        {
           FileStream fileStream = ofd.File.OpenRead();
           BitmapImage bi = new BitmapImage();
           bi.SetSource(fileStream);
           viewerControl.Source = bi;
           _imagePanViewer.Source = viewerControl;
           fileStream.Close();
        }
     }
     catch (Exception ex)
     {
        MessageBox.Show(ex.Message);
     }
   }
   

6. Build, and Run the program to test it.

   Click the "Load" button, and select a valid JPEG or PNG image.