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CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
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Figure 18 5. Creating a new storyboard animation in Expression Blend 8. Save everything in Expression Blend (File Save All) and switch back to Visual Studio.
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Now what you will do is add code to first show the animation when the search for images is initiated, and then stop the animation once that search is complete. To start the animation you have just created once the user initiates search for Flickr images, you will call the Begin method of the loadingImages animation. In MainPage.xaml.cs, change the code that creates an Observer for the KeyUp event to the following: keys.ObserveOn(Deployment.Current.Dispatcher).Subscribe(evt => { if (txtSearchTerms.Text.Length > 0) { lblSearchingFor.Text = "Searching for ..." + txtSearchTerms.Text; lblLoading.Visibility=System.Windows.Visibility.Visible; loadingImages.Begin(); webResults.Navigate(new Uri("http://www.flickr.com/search/ q=" + txtSearchTerms.Text)); } });
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Figure 18 6. Beginning of the Loading Images timeline animation Once the images load in the WebBrowser control, you will stop the animation by calling the Stop method of the loadingImages animation. To accomplish this, you will use Rx.NET to subscribe to the web browser s Navigated event. Once this subscription receives data, you will stop the animation. The following code accomplishes these tasks.
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Figure 18 7. End of the Loading Images timeline animation 9. Paste the following code at the end of the MainPage constructor.
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var browser = Observable.FromEvent<System.Windows.Navigation.NavigationEventArgs>(webResults, "Navigated"); browser.ObserveOn(Deployment.Current.Dispatcher).Subscribe(evt => { loadingImages.Stop(); lblLoading.Visibility = System.Windows.Visibility.Collapsed; }); You are now ready to run the application. 10. Press F5, type a keyword into the text box, and observe the animation while the images are being loaded into the browser. While we have only scratched the surface of Rx.NET and its applications, you can already see how powerful this framework is. Using Rx.NET, you can think of virtually any event as an observable data source, whether it s a location service that generates coordinate values (which you can think of as an observable set of position values) or accelerometer data, or key press events, or web browser events, such as those already demonstrated. Now that you have seen how to create Observable data sources from events using the FromEvent<T> keyword and how to subscribe to those events, we will expand upon
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this knowledge in the next section. Specifically, using Rx.NET, you will build a small real-time weather application that will use a publicly available web service to asynchronously retrieve current weather and show a small picture representing current weather for the zip code provided.
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Using Rx.NET with Web Services to Asynchronously Retrieve Weather Data
In this section, you will use a publicly available weather web service located at www.webservicex.net/WCF/Default.aspx to retrieve and display current weather for a given zip code within the United States. In addition to weather services, there are many other useful web services available at this location, including zip code validation and currency conversion. As an exercise in the usage of Rx.NET, you are encouraged to build useful, functional applications that take advantage of these services. From the development point of view, the weather application will consist of (1) asynchronously capturing user input zip code, and (2) asynchronously calling the web service and then displaying the current weather for a given zip code. Let s go ahead and create the application.
Creating a Windows Phone Project
First, you will create a new project, import all of the libraries and create service references necessary to make the weather application work. 1. 2. Launch Visual Studio 2010 Express for Windows Phone and create a new Windows Phone Application project. Name it WeatherRx. In MainPage.xaml, change the name of the application to WeatherRx and change the page title to Weather App (you are also certainly welcome to name the application and the page according to your preference). Since you will be using Rx.NET to build this application, add a reference (by right-clicking and selecting Add Reference) to Microsoft.Phone.Reactive and System.Observable assemblies.
You need to add a Service Reference to the weather service already mentioned. The weather service is an .asmx web service hosted at www.webservicex.net. 4. To add a reference to this service, right-click the Project Name and select Add Service Reference. In the dialog that comes up, enter the following value in the Address Textbox: http://www.webservicex.net/WeatherForecast.asmx. Press the Go button. The WeatherForecast service should appear on the left. Click the arrow next to it, make sure to select WeatherForecastSoap service, and then rename the namespace to svcWeather. Your final Add Service screen should look like Figure 18 8. Press the OK button.
6. 7.
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