By Josh Smith

This publication is for WPF and Silverlight builders trying to take their Model-View-ViewModel abilities to the following point. It reports how the MVVM layout trend used to be used to create a enjoyable and addictive online game that gives a sublime person event. learn this ebook to realize insights from Josh Smith, an well-known professional in WPF, Silverlight, and MVVM, on how you can safely layout advanced View and ViewModel architectures. methods to aid limitless undo, coordinate lively transitions, regulate modal conversation containers from a ViewModel, and masses extra.

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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 utilizes the BubbleGroup class, which we saw in Chapter 4, to get a list of bubbles in the bubble group currently under the mouse cursor. If a bubble group is available, that list of bubbles is sent to BubblesTaskManager for further processing.

Once the bubble group has been removed, the next phase drops all bubbles that were above the group down into the vacated area. The screenshot below shows bubbles in the process of dropping down: Once that phase completes, all bubbles move as far right as they can: Creating Animated Transitions in the ViewModel As explained earlier, the ViewModel and View are involved with orchestrating animated transitions. When the user clicks on a bubble it causes BubbleViewModel’s BurstBubbleGroupCommand to execute.

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. 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.

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Advanced MVVM by Josh Smith

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