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 was once used to create a enjoyable and addictive online game that gives a sublime person event. learn this e-book to achieve insights from Josh Smith, an famous specialist in WPF, Silverlight, and MVVM, on how you can appropriately layout complicated View and ViewModel architectures. the right way to aid limitless undo, coordinate lively transitions, keep an eye on modal conversation containers from a ViewModel, and lots more and plenty extra.

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Responding to User Input An undo operation is performed in response to user input, so the first step is to listen for the appropriate input events. Since there are two ways to tell the game to perform an undo operation, there are two code paths that lead to the undo functionality. BubbleBurstView listens for the Ctrl + Z keystroke and calls Undo on BubbleMatrixViewModel. void HandleMatrixDimensionsAvailable(object sender, EventArgs e) { // Hook the keyboard event on the Window because this // control does not receive keystrokes.

Afterwards we visited the ViewModel layer and saw how the logical state of the user interface is treated as a first-class citizen of the application. 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.

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 first call is to GetStoryboardCreationData.

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