Added Shell events

/cc #63

Author: madskristensen

src/Community.VisualStudio.Toolkit.Shared/Events/Events.cs

@@ -50,6 +50,11 @@ internal Events()
         /// </summary>
         public DocumentEvents DocumentEvents => new();
 
+        /// <summary>
+        /// Events related to the Visual Studio Shell.
+        /// </summary>
+        public ShellEvents ShellEvents => new();
+
 
         private DTEEvents? _dteEvents;
         public DTEEvents? DTEEvents => _dteEvents ??= _events?.DTEEvents;

src/Community.VisualStudio.Toolkit.Shared/Events/ShellEvents.cs

@@ -0,0 +1,58 @@
+using System;
+using Microsoft;
+using Microsoft.VisualStudio;
+using Microsoft.VisualStudio.Shell;
+using Microsoft.VisualStudio.Shell.Interop;
+
+namespace Community.VisualStudio.Toolkit
+{
+    /// <summary>
+    /// Events related to the Visual Studio Shell.
+    /// </summary>
+    public class ShellEvents : IVsShellPropertyEvents, IVsBroadcastMessageEvents
+    {
+        private const uint _wM_SYSCOLORCHANGE = 0x0015;
+
+        internal ShellEvents()
+        {
+            ThreadHelper.ThrowIfNotOnUIThread();
+            var svc = (IVsShell)ServiceProvider.GlobalProvider.GetService(typeof(SVsShell));
+            Assumes.Present(svc);
+            svc.AdviseShellPropertyChanges(this, out _);
+            svc.AdviseBroadcastMessages(this, out _);
+        }
+
+        /// <summary>
+        /// When Visual Studio enters into an interactive state.
+        /// </summary>
+        public event Action? ShellAvailable;
+
+        /// <summary>
+        /// When Visual Studio enters into an interactive state.
+        /// </summary>
+        public event Action? EnvironmentColorChanged;
+
+        int IVsShellPropertyEvents.OnShellPropertyChange(int propid, object var)
+        {
+            if (propid == (int)__VSSPROPID.VSSPROPID_Zombie || propid == (int)__VSSPROPID4.VSSPROPID_ShellInitialized)
+            {
+                if (!(bool)var)
+                {
+                    ShellAvailable?.Invoke();
+                }
+            }
+
+            return VSConstants.S_OK;
+        }
+
+        int IVsBroadcastMessageEvents.OnBroadcastMessage(uint msg, IntPtr wParam, IntPtr lParam)
+        {
+            if (msg == _wM_SYSCOLORCHANGE)
+            {
+                EnvironmentColorChanged?.Invoke();  
+            }
+
+            return VSConstants.S_OK;
+        }
+    }
+}

src/Community.VisualStudio.Toolkit.Shared/VSSDK.Helpers.Shared.projitems

@@ -12,6 +12,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Commands\CommandAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Editor\WpfTextViewCreationListener.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Events\BuildEvents.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Events\ShellEvents.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Events\DebuggerEvents.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Events\SelectionEvents.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Events\SolutionEvents.cs" />