Download Advanced MVVM by Josh Smith PDF

By Josh Smith

This booklet is for WPF and Silverlight builders seeking to take their Model-View-ViewModel talents to the subsequent point. It experiences how the MVVM layout trend used to be used to create a enjoyable and addictive video game that gives a chic person event. learn this publication to realize insights from Josh Smith, an famous professional in WPF, Silverlight, and MVVM, on tips on how to adequately layout complicated View and ViewModel architectures. tips on how to help limitless undo, coordinate lively transitions, keep watch over modal conversation bins from a ViewModel, and lots more and plenty extra.

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That method’s parameter is the list of tasks created by a previous invocation of the CreateTasks method. Each of those tasks provides the information needed to create a new set of “undo tasks” that return the game state to how it was before the original tasks were performed. TaskType, true, getBubbles, complete); } Each BubblesTask returned by that method has its IsUndo property set to true, via the second constructor parameter. That property is inspected by the View’s BubblesTaskStoryboardFactory when it is deciding how to animate the bubbles to their new locations.

That logic from BubbleViewModel is seen below: readonly BubbleLocationManager _locationManager; int? MoveToPreviousLocation(); } internal void EndUndo() { // Now that the Undo operation is finished, // it's back to business as usual. PreviousRow; } } This is an implementation detail peculiar to the BubbleBurst game. The general concept, however, of keeping a helper class simple by not polluting it with logic for unrelated features, like unlimited undo, is relevant in many situations. It helps minimize the impacts of such features on the code base.

CanUndo; } } As you can see in the following code snippet from BubblesTaskManager, the code involved with undoing a bubble group burst looks quite similar to the code required to perform the burst in the first place. ///

/// Publishs a set of tasks that will undo the previous bubble burst. PublishTasks(undoTasks); } The _undoStack has collections of tasks pushed onto it when the user bursts bubble groups by the PublishTasks method seen in the previous chapter. In the Undo method those collections of tasks are popped from the stack to create new tasks.

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