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POMVVM Binding Issue - Another Noob-ish Issue
 

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    <p>So here I am again, asking a <a href="https://stackoverflow.com/questions/14692486/wpf-databinding-issues-possible-noob-problems">very similar question to yesterday</a>. I re-factored my project in order to better follow the MVVM pattern. Now my binding is no longer working as it was yesterday. I am trying to bind the visibility of a dock panel to a button. Here is some of my code:</p> <p>ViewModel:</p> <pre><code>public class SelectWaferButtonViewModel : INotifyPropertyChanged { private bool isClicked; public SelectWaferButtonViewModel() { isClicked = false; } public bool IsControlVisible { get { return isClicked; } set { isClicked = value; OnPropertyChanged("IsControlVisible"); } } public event PropertyChangedEventHandler PropertyChanged; public void OnButtonClick() { if (isClicked) { IsControlVisible = false; } else { IsControlVisible = true; } } protected virtual void OnPropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } } } </code></pre> <p>XAML:</p> <pre><code>&lt;Window.Resources&gt; &lt;local:BoolToVisibilityConverter x:Key="BoolToVisConverter"/&gt; &lt;local:SelectWaferButtonViewModel x:Key="SelectWaferButton" /&gt; &lt;local:WaferTrackerWindowViewModel x:Key="WindowViewModel" /&gt; &lt;/Window.Resources&gt; &lt;DockPanel Name="tvwDockPanel" DataContext="{StaticResource SelectWaferButton}" Width="225" Visibility="{Binding IsControlVisible, Mode=TwoWay, FallbackValue=Collapsed, Converter={StaticResource BoolToVisConverter}}" DockPanel.Dock="Left"&gt; &lt;/DockPanel&gt; </code></pre> <p>My <code>BoolToVisConverter</code>:</p> <pre><code>public class BoolToVisibilityConverter : IValueConverter { public BoolToVisibilityConverter() { } public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { bool bValue = (bool) value; if (bValue) { return Visibility.Visible; } else { return Visibility.Collapsed; } } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { Visibility visibility = (Visibility) value; if (visibility == Visibility.Visible) { return true; } else { return false; } } } </code></pre> <p>I apologize for a question that is similar to yesterday, but I am struggling with this MVVM stuff since I am quite new to WPF. Any help will be much appreciated.</p> <ul> <li>Thanks in advanced,</li> </ul> <p><strong><em>EDIT:</em></strong> <strong><em>Here is some extra code snippets for further reference:</em></strong></p> <pre><code>public class WaferTrackerWindowViewModel :INotifyPropertyChanged { private SelectWaferButtonViewModel btnSelectWaferViewModel; public event PropertyChangedEventHandler PropertyChanged; private DelegateCommand exitCommand; private DelegateCommand expandPanelCommand; private DelegateCommand selectWaferCommand; public WaferTrackerWindowViewModel() { this.InstantiateObjects(); initThread.RunWorkerAsync(); } public string SelectedWafer { get { return selectedWafer; } set { selectedWafer = value; } } public ICommand ExitCommand { get { if (exitCommand == null) { exitCommand = new DelegateCommand(Exit); } return exitCommand; } } public ICommand ExpandPanelCommand { get { if (expandPanelCommand == null) { expandPanelCommand = new DelegateCommand(ExpandPanel); } return expandPanelCommand; } } public ICommand SelectWaferCommand { get { if (selectWaferCommand == null) { selectWaferCommand = new DelegateCommand(SelectWafer); } return selectWaferCommand; } } private void InstantiateObjects() { btnSelectWaferViewModel = new SelectWaferButtonViewModel(); initThread = new BackgroundWorker(); } private void ExpandPanel() { btnSelectWaferViewModel.OnButtonClick(); } private void SelectWafer() { //Does Nothing Yet } private void Exit() { Application.Current.Shutdown(); } private void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } private void InitThread_DoWork(object sender, DoWorkEventArgs e) { TreeViewPresenter tvwPresenter = new TreeViewPresenter(); tvwPresenter.WaferList = DataLibrary.GetWaferList(); } private void InitThread_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { tvwPresenter.TreeView.DataContext = tvwPresenter.ProcessesAndWafers; tvwPresenter.WaferListCache = tvwPresenter.ProcessesAndWafers; tvwPresenter.ProcessArray = tvwPresenter.WaferListCache.ToArray(); } } </code></pre> <p><strong><em>When the "expand panel" button gets clicked, it calls the <code>ExpandPanel</code> command, which routes the execution to the method "private void ExpandPanel()" in this same class. Then, in the <code>ExpandPanel()</code> method, it calls the <code>OnButtonClick()</code> method on the <code>btnSelectWaferViewModel</code> object, which will change the <code>IsControlVisible</code> property. This change should then be reflected onto the bound dock panel, but this is not happening</em></strong> </p> <p>Kyle</p>
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    1. COYou know that there already exists a [BooleanToVisibilityConverter](http://msdn.microsoft.com/en-us/library/system.windows.controls.booleantovisibilityconverter.aspx) in WPF?
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    2. COSince he defines the property himself, he could just make it a Visibility, rather than storing it as a Boolean.
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    3. CO@sircodesalot: Putting `Visbility` into your ViewModel is mixing in too much View logic in my opinion. An `IsVisible` property I think better captures the intent. It's also the opinion of the answer the OP accepted yesterday, so you are really confusing the issue by suggesting they change it back!
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      1. POMVVM Binding Issue - Another Noob-ish Issue
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