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POHow can I change the VisualState in a View from the ViewModel?
 

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  1. POHow can I change the VisualState in a View from the ViewModel?
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    <p>I'm new to WPF and MVVM. I think this is a simple question. My ViewModel is performing an asynch call to obtain data for a DataGrid which is bound to an ObservableCollection in the ViewModel. When the data is loaded, I set the proper ViewModel property and the DataGrid displays the data with no problem. However, I want to introduce a visual cue for the user that the data is loading. So, using Blend, I added this to my markup:</p> <pre><code> &lt;VisualStateManager.VisualStateGroups&gt; &lt;VisualStateGroup x:Name="LoadingStateGroup"&gt; &lt;VisualState x:Name="HistoryLoading"&gt; &lt;Storyboard&gt; &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="HistoryGrid"&gt; &lt;DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Hidden}"/&gt; &lt;/ObjectAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;/VisualState&gt; &lt;VisualState x:Name="HistoryLoaded"&gt; &lt;Storyboard&gt; &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="WorkingStackPanel"&gt; &lt;DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Hidden}"/&gt; &lt;/ObjectAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;/VisualState&gt; &lt;/VisualStateGroup&gt; &lt;/VisualStateManager.VisualStateGroups&gt; </code></pre> <p>I <em>think</em> I know how to change the state in my code-behind (something similar to this): </p> <pre><code>VisualStateManager.GoToElementState(LayoutRoot, "HistoryLoaded", true); </code></pre> <p>However, the place where I want to do this is in the I/O completion method of my ViewModel which does not have a reference to it's corresponding View. How would I accomplish this using the MVVM pattern?</p>
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