Download Advanced MVVM by Josh Smith PDF

By Josh Smith

This publication is for WPF and Silverlight builders seeking to take their Model-View-ViewModel talents to the following point. It experiences how the MVVM layout development used to be used to create a enjoyable and addictive online game that gives a sublime person adventure. learn this e-book to achieve insights from Josh Smith, an famous specialist in WPF, Silverlight, and MVVM, on easy methods to correctly layout complicated View and ViewModel architectures. the way to help limitless undo, coordinate lively transitions, regulate modal conversation containers from a ViewModel, and masses extra.

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When the user clicks on a bubble it causes BubbleViewModel’s BurstBubbleGroupCommand to execute. That command delegates to the BurstBubbleGroup method on the bubble matrix. When BubbleMatrixViewModel is told to burst the current bubble group, it ends up publishing a queue of BubblesTask objects to BubbleMatrixView. We will examine how the View processes those tasks in the next section of this chapter. For now, let’s focus on how the ViewModel objects cooperate to create this queue of tasks. The following class diagram shows the key players involved: Our starting point is the BurstBubbleGroup method on BubbleMatrixViewModel.

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. That animation uses Penner equations to determine its output values, which can be useful for creating elegant, natural movements in the user interface.

We will see how that fits into the picture in the next chapter. At this point we have seen the task management logic, but not how the BubblesTask objects are created. Let’s turn our attention to BubblesTaskFactory to see how that works. The task manager calls CreateTasks on a task factory, which is where the tasks are created, as seen below: ///

/// Creates a sequence of tasks that must be performed for the /// specified collection of bubbles. MoveRight }; // Dump the tasks into an array so that the query is not executed twice.

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