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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.MainPage"
                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
                  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
                  xmlns:Leadtools_Windows_Controls="clr-namespace:Leadtools.Windows.Controls;assembly=Leadtools.Windows.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_Windows_Controls:RasterImageViewer x:Name="viewerControl" SizeMode="Normal" Height="550"></Leadtools_Windows_Controls:RasterImageViewer> 
                        </StackPanel>
                    </ScrollViewer>
                    
                    <ScrollViewer VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Disabled" Grid.Column="1">
                        <StackPanel Orientation="Vertical" >
                            <TextBlock Text="Pan Window :"/>
                            <Leadtools_Windows_Controls:ImagePanViewer x:Name="_imagePanViewer" Width="150" Height="150" HorizontalAlignment="Left"></Leadtools_Windows_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.Windows.Controls.InteractiveMode.Pan
               
                     Case "Center At"
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.CenterAt
               
                     Case "Magnify Glass"
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.MagnifyGlass
               
                     Case "Scale"
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.Scale
               
                     Case "Zoom To"
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.ZoomTo
               
                     Case Else
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.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.Windows.Controls.InteractiveMode.Pan;
                        break;
               
                     case "Center At":
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.CenterAt;
                        break;
               
                     case "Magnify Glass":
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.MagnifyGlass;
                        break;
               
                     case "Scale":
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.Scale;
                        break;
               
                     case "Zoom To":
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.ZoomTo;
                        break;
               
                     default:
                        viewerControl.InteractiveMode = Leadtools.Windows.Controls.InteractiveMode.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()
                        Try
                           Dim codecs As RasterCodecs = New RasterCodecs()
                           viewerControl.Image = codecs.Load(fileStream)
                           _imagePanViewer.Source = viewerControl
                        Finally
                           fileStream.Dispose()
                        End Try
                     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)
                     {
                        using (FileStream fileStream = ofd.File.OpenRead())
                        {
                           RasterCodecs codecs = new RasterCodecs();
                           viewerControl.Image = codecs.Load(fileStream);
                           _imagePanViewer.Source = viewerControl;
                        }
                     }
                  }
                  catch (Exception ex)
                  {
                     MessageBox.Show(ex.Message);
                  }
                }
                
   

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

   Click the "Load" button, and select an image.

   NOTE: if you encounter an "Invalid File Format" or "Feature Not Supported" exception, please refer to the topic Invalid File Format/Feature Not Supported.