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POWPF - Coupling a GlobalResource to a ViewModel
 

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  1. POWPF - Coupling a GlobalResource to a ViewModel
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    <p>I have a WPF application with a <a href="http://www.codeproject.com/KB/WPF/wpf_notifyicon.aspx" rel="nofollow">NotifyIcon</a> defined in a ResourceDictionary that is added to Application.Current.Resources on App start.</p> <p>I am using the MVVM-Light framework and I want to bind the Command properties of a ContextMenu.MenuItems on the NotifyIcon to a public RelayCommand defined in a ViewModel.</p> <p>I am comfortable with coupling a View to a ViewModel but how to I couple a Global Resource to a ViewModel?</p> <p>Here is my attempt at getting this to work, just not sure if I'm on the correct lines or not...</p> <p>When I run this code I get an error stating "Cannot find resource named 'Locator'. Resource names are case sensitive." This originates from the DataContext binding on the TaskBarIcon tag in NotificationIconResources.xaml</p> <p>SingleInstanceManager ensures just one instance can be created</p> <pre><code> public sealed class SingleInstanceManager : WindowsFormsApplicationBase { [STAThread] public static void Main(string[] args) { (new SingleInstanceManager()).Run(args); } public SingleInstanceManager() { IsSingleInstance = true; } public ControllerApp App { get; private set; } protected override bool OnStartup(StartupEventArgs e) { App = new ControllerApp(); App.Run(); return false; } protected override void OnStartupNextInstance(StartupNextInstanceEventArgs eventArgs) { base.OnStartupNextInstance(eventArgs); App.MainWindow.Activate(); App.ProcessArgs(eventArgs.CommandLine.ToArray(), false); } } </code></pre> <p>ControllerApp replaces App.xaml and App.xaml.cs</p> <pre><code>public class ControllerApp : Application { public MainWindow window { get; private set; } bool startMinimized = false; private TaskbarIcon tb; public ControllerApp() : base() { } protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); DispatcherHelper.Initialize(); ResourceDictionary dict = new ResourceDictionary(); dict.Source = new Uri("NotificationIconResources.xaml", UriKind.Relative); Application.Current.Resources.MergedDictionaries.Add(dict); ViewModel.ViewModelLocator vmLocator = new ViewModel.ViewModelLocator(); Application.Current.Resources.Add("Locator", vmLocator); window = new MainWindow(); ProcessArgs(e.Args, true); //initialize NotifyIcon tb = (TaskbarIcon)FindResource("ItemNotifyIcon"); if (startMinimized) { window.WindowState = WindowState.Minimized; } window.Show(); } protected override void OnExit(ExitEventArgs e) { base.OnExit(e); tb.Dispose(); } public void ProcessArgs(string[] args, bool firstInstance) { } } </code></pre> <p>NotificationIconResources.xaml is the resource dictionary defining the NotifyIcon</p> <pre><code>&lt;ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:tb="http://www.hardcodet.net/taskbar"&gt; &lt;tb:TaskbarIcon x:Key="ItemNotifyIcon" IconSource="/Controller;component/Images/ItemRunning.ico" IsNoWaitForDoubleClick="True" ToolTipText="Item is running" DataContext="{Binding NotifyIcon, Source={StaticResource Locator}}"&gt; &lt;tb:TaskbarIcon.ContextMenu&gt; &lt;ContextMenu&gt; &lt;MenuItem Header="Open Control Panel" /&gt; &lt;Separator /&gt; &lt;MenuItem Header="Start Item" Command="{Binding Path=StartServiceCommand}" /&gt; &lt;MenuItem Header="Pause Item" /&gt; &lt;MenuItem Header="Stop Item" Command="{Binding Path=StopServiceCommand}" /&gt; &lt;Separator /&gt; &lt;MenuItem Header="Close" /&gt; &lt;/ContextMenu&gt; &lt;/tb:TaskbarIcon.ContextMenu&gt; &lt;/tb:TaskbarIcon&gt; &lt;/ResourceDictionary&gt; </code></pre> <p>NotifyIconViewModel contains the RelayCommands I want to bind to</p> <pre><code> /// &lt;summary&gt; /// This class contains properties that the NotifyIcon View can data bind to. /// &lt;para&gt; /// Use the &lt;strong&gt;mvvminpc&lt;/strong&gt; snippet to add bindable properties to this ViewModel. /// &lt;/para&gt; /// &lt;para&gt; /// You can also use Blend to data bind with the tool's support. /// &lt;/para&gt; /// &lt;para&gt; /// See http://www.galasoft.ch/mvvm/getstarted /// &lt;/para&gt; /// &lt;/summary&gt; public class NotifyIconViewModel : ViewModelBase { private ServiceController sc; public string Welcome { get { return "Welcome to MVVM Light"; } } /// &lt;summary&gt; /// Initializes a new instance of the NotifyIconViewModel class. /// &lt;/summary&gt; public NotifyIconViewModel() { if (IsInDesignMode) { // Code runs in Blend --&gt; create design time data. } else { sc = new ServiceController("Item"); } } #region Public Commands private RelayCommand _startServiceCommand = null; public RelayCommand StartServiceCommand { get { if (_startServiceCommand == null) { _startServiceCommand = new RelayCommand( () =&gt; this.OnStartServiceCommand(), () =&gt; (sc.Status == ServiceControllerStatus.Stopped)); } return _stopServiceCommand; } } private void OnStartServiceCommand() { try { sc.Start(); } catch (Exception ex) { // notify user if there is any error AppMessages.RaiseErrorMessage.Send(ex); } } private RelayCommand _stopServiceCommand = null; public RelayCommand StopServiceCommand { get { if (_stopServiceCommand == null) { _stopServiceCommand = new RelayCommand( () =&gt; this.OnStopServiceCommand(), () =&gt; (sc.CanStop &amp;&amp; sc.Status == ServiceControllerStatus.Running)); } return _stopServiceCommand; } } private void OnStopServiceCommand() { try { sc.Stop(); } catch (Exception ex) { // notify user if there is any error AppMessages.RaiseErrorMessage.Send(ex); } } #endregion ////public override void Cleanup() ////{ //// // Clean up if needed //// base.Cleanup(); ////} } </code></pre>
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