By Josh Smith

This ebook is for WPF and Silverlight builders seeking to take their Model-View-ViewModel abilities to the subsequent point. It studies how the MVVM layout trend used to be used to create a enjoyable and addictive online game that gives a chic consumer adventure. learn this booklet to achieve insights from Josh Smith, an well-known specialist in WPF, Silverlight, and MVVM, on tips on how to effectively layout complicated View and ViewModel architectures. how to help limitless undo, coordinate lively transitions, keep an eye on modal conversation packing containers from a ViewModel, and lots more and plenty extra.

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ViewModels must take precautions against poorly written Views. Exceptions should be thrown when Views invoke ViewModel methods at the wrong time, or with invalid arguments. Collections of data should be exposed as read-only collections, such as ReadOnlyObservableCollection, whenever possible. What we have not yet seen is how the Storyboards that move BubbleViews are created. That is the responsibility of BubblesTaskStoryboardFactory. ToArray()); } This method relies on two helper methods to get its job done.

The PerformTask method must check to see if its storyboard argument is null, because it is possible that a task could have no bubbles associated with it. This situation arises when, for example, there are no bubbles to move down after the user bursts a bubble group. When a task has no bubbles there is no need to run a Storyboard. The task manager exposes a GetPendingTask method, which pops the next task off its queue and returns it. If the queue is empty, because all tasks have been processed, it returns null.

That method determines the values that should be used to configure a Storyboard for the specified task type. It’s a rather long method that does not provide much insight into how this logic works, so we won’t bother reviewing it here. Instead, let’s take a look at the logic that uses those configuration values to produce a Storyboard. Add(anim); return storyboard; } The method seen above creates a Storyboard that contains an animation for every bubble associated with a BubblesTask. The type of animation created is EasingDoubleAnimation, which comes from my Thriple library on CodePlex.

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Advanced MVVM by Josh Smith

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