By Josh Smith

This publication is for WPF and Silverlight builders seeking to take their Model-View-ViewModel abilities to the following point. It studies how the MVVM layout development used to be used to create a enjoyable and addictive online game that offers a sublime person event. learn this e-book to achieve insights from Josh Smith, an well-known specialist in WPF, Silverlight, and MVVM, on find out how to safely layout complicated View and ViewModel architectures. methods to aid limitless undo, coordinate lively transitions, keep watch over modal conversation containers from a ViewModel, and lots more and plenty extra.

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Here is an abridged description of the BubblesTask class: public class BubblesTask { IEnumerable Bubbles { get; } Action Complete { get; } bool IsUndo { get; } BubblesTaskType TaskType { get; } } BubblesTaskManager uses a BubblesTaskFactory to create tasks. It places those tasks onto a queue, which is used later by the View’s task processing routine. Here is the relevant code from BubblesTaskManager: readonly BubblesTaskFactory _bubblesTaskFactory; readonly Queue _pendingTasks; readonly Stack> _undoStack; ///

/// Publishs a set of tasks that will burst a bubble group.

At several points we stopped to reflect on how one can create a separation of concerns by using good judgment and common sense to decide if code should live in the ViewModel or in a View’s code-behind file. Once we had a high-level understanding of the application architecture the real fun began. We saw how animated transitions can improve the user experience, and took a deep dive into how they work in BubbleBurst. Next we saw how the task-based pattern used for providing animated transitions was naturally extended to allow the user to perform unlimited undo operations that also result in animated transitions.

That property is inspected by the View’s BubblesTaskStoryboardFactory when it is deciding how to animate the bubbles to their new locations. When the user bursts a bubble group, the bottommost bubbles fall first and the rightmost bubbles move to the right first. The opposite is true for when the user performs an undo operation. Another point of interest in the method seen above is how the first two tasks call the BeginUndo and EndUndo methods on each bubble whose location is affected. Those method calls ensure that the bubbles return the proper values from their PreviousRow and PreviousColumn properties.

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