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CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
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Figure 18 4. An invalid cross-access thread exception is generated when trying to update UI directly from the background thread. Fortunately, the creators of Rx.NET have provided a solution to this problem by providing the ObserveOn() extension method in the Microsoft.Phone.Reactive assembly. This extension method has several overloads, and one of them accepts a Dispatcher object. In the .NET Framework, a Dispatcher object maintains a prioritized queue of work items on a specific thread, and here it provides a way for you to observe an Observable data source on the UI thread. In the preceding example, you pass the Deployment.Current.Dispatcher property to the ObserveOn() method to get thread-safe access to the current Dispatcher and use it to update visual elements on the phone. The use of a single ObserveOn() method is significantly easier than dealing with the Dispatcher s Invoke method, which is a common way to update UI in multi-threaded Silverlight and WPF applications.
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Adding an Animation that Plays as Flickr Images Load
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You can further enhance the Flickr image search application by adding a simple animation that will play while the web pages with the results of your image search are loading. To do that, you will create a simple animation in Expression Blend for Windows Phone, subscribe to the Navigated event of the WebBrowser control, and play the animation in code. Follow these steps to add this feature to your project.
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CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
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Still in Visual Studio for Windows Phone, add a textblock to the phone s design surface and place it between the Searching for textblock and the WebBrowser control. Name that textblock lblLoading, set the caption to Loading Images, and set its Visibility property to Collapsed.
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Microsoft Expression Blend for Windows Phone is a powerful application for creating and editing graphics and animations for Windows Phone 7 devices. You have used it in the first part of this book to style controls and for other graphical tasks. 2. To launch Expression Blend and load it with the Flickr project, right-click MainPage.xaml in Visual Studio and select Open in Expression Blend. Microsoft Expression Blend launches with your solution open and ready to edit.
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Your animation will be a progress bar in the form of a rectangle that will grow in width as the time passes. This animation will loop indefinitely, so that when it reaches maximum allowable size, the rectangle will go back to its beginning and the animation will be repeated. 3. In Expression Blend, select a Rectangle from the Toolbox, draw a very narrow, almost invisible rectangle right next to the Loading Images textblock, and set its Fill color to red.
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Now, you will create what is called a timeline animation in Expression Blend. Timeline animations are created with the use of the storyboards, so you will create a new storyboard in this step. 4. In the Objects and Timeline window, click the New button (shown in Figure 18 5), name the storyboard loadingImages, and click OK.
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The Objects and Timeline panel will now change to display a timeline, and Blend is ready to record your animation. 5. 6. Select the rectangle that you placed on the Windows Phone design surface and click the Record Keyframe button, as shown in Figure 18 6. Next, move the Animation Playhead (the yellow vertical line in the Timeline) to about 1.5 seconds, as shown in Figure 18 7. Click the Record Keyframe button again, and then resize the rectangle to be close to the full phone screen width.
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Now you will now set the animation to loop as long as it is active. 7. In Objects and Timeline, click and select the loadingImages storyboard name. Common Properties for the Storyboard dialog appears. Select Forever in the Repeat Behavior property of this storyboard.
With the animation now complete, you are ready to show it when the user performs a search for Flickr images.
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