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Creating the details page

From: Windows Phone SDK Essential Training

Video: Creating the details page

If you remember back to our original sonnet set, we had a details page, but all it allowed you to do was look at the sonnet, and the only way you could interact with it was by clicking the Back button to go back to the list. Here we need a details page that not only has the XAML for putting the text of the sonnet on the screen. We also need some code behind that actually influences the functionality of the toggle favorites button, and so we're going to add a new details page to our solution. Also note that we created this solution using the pivot application template, which gave us only a main page and not a details page.

Creating the details page

If you remember back to our original sonnet set, we had a details page, but all it allowed you to do was look at the sonnet, and the only way you could interact with it was by clicking the Back button to go back to the list. Here we need a details page that not only has the XAML for putting the text of the sonnet on the screen. We also need some code behind that actually influences the functionality of the toggle favorites button, and so we're going to add a new details page to our solution. Also note that we created this solution using the pivot application template, which gave us only a main page and not a details page.

It's not every pivot application has a details page. But here we are going to add a new item, I am going to put a Windows Phone Portrait Page. I am going to call it DetailsPage, and in XAML what we're going to have in there, looks like this. It has our title for our application. The text block at the top now has the word sonnet, because we're also going to put the sonnet number in there. We also have an image control, that you can see by default has an empty string for the source property which makes it transparent.

And when the sonnet has a favorite, will put images/favorites.png, to make our gold star show up. Lastly, we've added down here in the ApplicationBar, a menu item with that appbar.favs.rest.png image and also the Text of Favorite and a Click-handler called toggleFavorite, which will now go and add to the code. So let's take a look at what the code behind our DetailsPage is.

So we can now see what it is we need to do. So, as before we have our ItemViewModel for the item, and we have our OnNavigatedTo. But now our OnNavigatedTo method needs to do a little more. First, we go to see if we have a selectedItem, which we always should have. Then we parse it back into an integer. We are going to see if we have another query item that we add to the code that handles selection from the favorites list or the all list, which recalled from favorites, and we go to see if we've got that.

So that we know that if the fromFavorites is set to 1,that we need to extract from our FavoriteItems in the ViewModel versus the regular items in the ViewModel. Once we've got our item we also keep track of the sonnet number, and finally we need to look at the IsFavorite property of that item that we just got to determine whether or not the URI for the image should be Images/ favorite.png or it should be left at the empty string. The second thing we've added here is this toggleFavorite_Click method, which handles the event when the user taps on the star in the ApplicationBar.

First, we'll see that we have a Debug. WriteLine here, as we were building this app we wanted to know that we actually got the right one. And as you probably already know the way to get access to that debug stuff is to add System.Diagnostics to your usings, and then you can use this, and it will come out in the output window of your Visual Studio as you're running the app. So what toggleFavorite does is it goes, gets our current item, toggles the state of that favorite boolean, and then we look at what is the new state of it.

So if it means it's now a favorite, we set the image source of our favorite image to the favorite PNG so that the gold star shows up. And then we go back to the MainViewModel and call AddItemToFavorites. So now this item will get added to our Favorites collection, and because that's databound to the list box in the Favorites section of the pivot, it will automatically get updated. Similarly, if it's no longer a favorite, we falling out in love with that particular sonnet. We set the FavoriteImage.Source back to the empty string, and we go back to the ViewModel and call RemoveItemFromFavorites so that it gets removed from that list, again data-binding will take it out of the actual list box.

And either way, whether or not this is a new favorite, or you know an old song that we no longer care about, we call UpdateDatabase which will take our collection of sonnets along with its favorite flags and write it back out to the isolated storage. Next step, we're going to make the changes to our main page to actually put our version of the lists into the pivot control, and then we will be ready to run.

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This video is part of

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Windows Phone SDK Essential Training

65 video lessons · 2903 viewers

Michael Lehman
Author

 
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  1. 2m 34s
    1. Welcome
      55s
    2. What you need to know to take this course
      51s
    3. Using the exercise files
      48s
  2. 15m 44s
    1. Downloading and installing the Windows Phone tools
      2m 44s
    2. Creating a Hello World application
      9m 31s
    3. Debugging on a Windows Phone device
      3m 29s
  3. 6m 29s
    1. Exploring device capabilities
      2m 58s
    2. Understanding the Emulator
      3m 31s
  4. 8m 51s
    1. Understanding the SDK
      8m 51s
  5. 41m 32s
    1. Introducing the converter
      3m 36s
    2. Creating the user experience (UX)
      13m 35s
    3. Responding to the Application Bar
      2m 40s
    4. Implementing click handlers
      3m 52s
    5. Saving and loading settings
      8m 18s
    6. Preparing your app for shipment
      9m 31s
  6. 20m 48s
    1. Introducing sonnets
      1m 38s
    2. Data binding with Silverlight
      4m 4s
    3. Exploring the Model-View-ViewModel pattern (MVVM)
      4m 2s
    4. Implementing the Master-Detail pattern using pages
      3m 53s
    5. Loading external data
      7m 11s
  7. 50m 26s
    1. Choosing a multipage controller
      3m 13s
    2. Preparing for persistence
      7m 30s
    3. Updating the data model
      7m 2s
    4. Creating the details page
      4m 30s
    5. Bringing it all together
      3m 58s
    6. Cloning a Windows Phone app
      6m 49s
    7. Using SQL CE
      8m 49s
    8. Updating the data model
      2m 24s
    9. Querying and updating the database
      6m 11s
  8. 14m 19s
    1. Working with the camera
      6m 11s
    2. Exploring GPS
      5m 21s
    3. Exploring the accelerometer
      2m 47s
  9. 29m 34s
    1. Introducing recording and playback with XNA
      45s
    2. Capturing sound
      5m 12s
    3. Providing feedback while recording
      5m 50s
    4. Playing a recording
      4m 34s
    5. Persisting a recording
      2m 58s
    6. Listing recordings
      5m 15s
    7. Managing the recording list
      3m 26s
    8. Recording under the lock screen
      1m 34s
  10. 28m 32s
    1. Building the UX
      3m 54s
    2. Using WebClient
      4m 1s
    3. Determining network connectivity
      2m 9s
    4. Leveraging Internet Explorer
      7m 56s
    5. Adding a live tile
      2m 42s
    6. Building a background agent
      7m 50s
  11. 14m 46s
    1. Hello World in C++
      4m 35s
    2. Libraries
      4m 17s
    3. Managed plus managed
      5m 54s
  12. 26m 35s
    1. Exploring built-in controls
      4m 28s
    2. Windows Phone Toolkit
      2m 42s
    3. Introducing Coding4Fun
      3m 13s
    4. Reminders and notifications
      6m 10s
    5. Wallet and In-App Purchase
      1m 34s
    6. File and protocol associations
      1m 59s
    7. Bluetooth
      44s
    8. Integrating speech
      1m 28s
    9. Near field communication (NFC)
      1m 23s
    10. WinRT and legacy Windows Phone APIs
      2m 54s
  13. 12m 14s
    1. Publishing your apps
      2m 49s
    2. Learning from apps in the Windows Phone Marketplace
      1m 22s
    3. Staying in touch with updates and new information from Microsoft
      2m 34s
    4. Looking at Windows Phone 7 app reviews
      44s
    5. Exploring web sites books and other useful links
      4m 45s
  14. 1m 34s
    1. Farewell
      1m 34s

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