Scott Hanselman

NOTE: If you haven't read the first post in this series, I would encourage you do to that first, or check out the BabySmash category. Also check out http://windowsclient.net/ for more developer info on WPF.

BACKGROUND: This is one of a series of posts on learning WPF. I wrote an application for my 2 year old using WPF, but as I'm a Win32-minded programmer, my working app is full of Win32-isms. It's not a good example of a WPF application even though it uses the technology. I'm calling on community (that's you, Dear Reader) to blog about your solutions to different (horrible) selections of my code. You can get the code http://www.codeplex.com/babysmash. Post your solutions on your blog, in the comments, or in the Issue Tracker and we'll all learn WPF together. Pick a single line, a section, or subsystem or the whole app!

When I decided I was running out of ideas for BabySmash! I decided that I needed to get some customer feedback. The babies had less to say that expected, but there are many videos of babies testing the application popping up on Flickr and YouTube, so I'll call that End User Testing.

I found a site called UserVoice.com (another similar one is GetSatisfaction.com) that is basically a hosted instant customer feedback site. Poof. UserVoice.com even supports a few widgets via Javascript like this one for embedding on your site.

It also supports DNS CName aliasing, so http://feedback.babysmash.com looks like it's hosted by me at http://www.babysmash.com, but instead it's at UserVoice. It's really professional and takes literally minutes. I had the whole thing installed an integrated in under 15 minutes, including color customization and logo.

After I put the site up and inserted links to BabySmash Feedback on the site, there were two ideas that didn't get many votes but had great potential and I figured would be fun to do. One person suggested using Wingdigs (the silly font) to use letter keystrokes to show the fun pictures embedded in the font, while the other suggestion was just to allow a custom font.

When I make the Letters, I create a single object of FormattedText and had hardcoded "Arial," then I call BuildGeometry() on that which basically creates a Path or Outline of the letter that I can mess with. I fill it, and outline it and sent it on its way. I hadn't even given alternative fonts a second thought.

private static Geometry MakeCharacterGeometry(string t)
{
   var fText = new FormattedText(
       t,
       CultureInfo.CurrentCulture,
       FlowDirection.LeftToRight,
       new Typeface(
           new FontFamily(Properties.Settings.Default.FontFamily),
           FontStyles.Normal,
           FontWeights.Heavy,
           FontStretches.Normal),
       300,
       Brushes.Black
       );
   return fText.BuildGeometry(new Point(0, 0)).GetAsFrozen() as Geometry;
}

So armed with this idea, I added FontFamily as an option in Visual Studio Settings for this project. Remember that I refactored the Options Dialog a few weeks back using Jason Kemp's code. This made it easy to just add one additional ComboBox. I'm getting good enough that I added the XAML in the Text Editor pane in Visual Studio rather than the designer.

I figured, since this WPF, can't I make that ComboBox more interesting than just a bunch of strings? Why not have the FontNames show up in the style of the Font like in Word? Well, System.Windows.Media.Fonts.SystemFontFamilies has the list of the fonts on the machine. I searched around and found part of what I needed at Norbert Eder's WPF blog. (BTW, congrats on being a newly minted MVP!)

<Window.Resources>
    <local:Settings x:Key="settings" />
    <CollectionViewSource Source="{Binding Source={x:Static Fonts.SystemFontFamilies}}" x:Key="myFonts"/>
</Window.Resources>

I can make a CollectionViewSource and make it a resource that is available to the Window, as seen above. The source is the collection of FontFamilies. Next, I make a regular ComboBox, which usually looks like this if you are just holding strings:

<Label Height="23" Grid.Row="2" Margin="10">Cursor</Label>
<ComboBox 
    SelectedValue="{Binding Path=Default.CursorType}" 
    SelectedValuePath="Content" Grid.Row="2" Height="23" Margin="70,10,7,0" Grid.ColumnSpan="2" VerticalAlignment="Top">
    <ComboBoxItem>Hand</ComboBoxItem>
    <ComboBoxItem>Arrow</ComboBoxItem>
</ComboBox>

<ComboBox x:Name="FontChooser" Grid.Row="3" Margin="70,10,7,0" 
  ItemsSource="{Binding Source={StaticResource myFonts}}" 
  SelectedValue="{Binding Path=Default.FontFamily}" SelectedValuePath="Source" Height="23" VerticalAlignment="Top" Grid.ColumnSpan="2">
    <ComboBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel />
        </ItemsPanelTemplate>
    </ComboBox.ItemsPanel>
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding}" FontFamily="{Binding}" Height="20"/>
         </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

The Data Template is what each item looks like, which is just the name of the font and setting the FontFamily to that item's FontFamily! Hard to write until you've done it once, then you start thinking of other cool stuff you can do with this knowledge elsewhere in your app.

The one thing that it flummox me for a half-hour was that I was binding the ComboBox to the list of Fonts from my Resources, but I wanted the SelectedValue (the item that is selected in the ComboBox) to be bound like all the other controls in my options dialog, to my application's Settings. That's where these attributes came in:

SelectedValue="{Binding Path=Default.FontFamily}" SelectedValuePath="Source" 

There the SelectedValue the FontFamily string from my Settings class (just like the Default.CursorType and others in the dialog) and the SelectedValuePath shows how to dig into that value. In this case, the Source property had the name (string) of the FontFamily.

The result looks like this:

I'm starting to "grok" WPF more each evening I code on BabySmash. I know I'm still just barely scratching the surface. I'm looking forward to implementing (with your help) more of the BabySmash Feedback Items.

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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