Technique SL22:Supporting Browser Zoom in Silverlight

Example 1: Verifying browser zoom, and checking the zoom factor

This example has a UI defined in XAML and logic defined in C#. The UI shows the zoom factor, and also demonstrates what happens when built-in browser zoom handling is deliberately disabled. Note that the zooming factor as reported by the API is still retained even when Silverlight built-in zoom scaling is disabled deliberately. The following is the XAML UI:

<UserControl x:Class="BrowserZoom.MainPage"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
   <StackPanel x:Name="LayoutRoot" Background="White">
       <TextBlock>Some text you can zoom.</TextBlock>
       <Button Click="Button_Click">Toggle built-in zoom handling</Button>
       <StackPanel Orientation="Horizontal">
           <Button Click="Button_Click_1">Query current zoom factor</Button>
           <TextBox IsReadOnly="true" Name="zoomf"
   Text="{Binding Path=reportZoom}"/>
       </StackPanel>
   </StackPanel>
</UserControl>

The following is the C# logic:

   public partial class MainPage : UserControl
   {
       public MainPage()
       {
           InitializeComponent();
       }
       private void Button_Click(object sender, RoutedEventArgs e)
       {
           if (!Application.Current.Host.Settings.EnableAutoZoom == false) {
           Application.Current.Host.Settings.EnableAutoZoom = false;
           }
           else
           {
               Application.Current.Host.Settings.EnableAutoZoom = true;
           }
       }
       private void Button_Click_1(object sender, RoutedEventArgs e)
       {
           zoomf.Text = Application.Current.Host.Content.ZoomFactor.ToString();
       }
   }

This example is shown in operation in the working example of Browser Zoom.