Merge pull request #2713 from comintern/next

Status event tweaks, bug fixes.

Author: retailcoder

Rubberduck.VBEEditor/Events/VBENativeServices.cs

@@ -73,10 +73,13 @@ public static void VbeEventCallback(IntPtr hWinEventHook, uint eventType, IntPtr
             {
                 OnSelectionChanged(hwnd);             
             }
-            else if (idObject == (int)ObjId.Window &&
-                     (eventType == (uint)WinEvent.ObjectCreate || eventType == (uint)WinEvent.ObjectDestroy) && 
-                     hwnd.ToWindowType() != WindowType.Indeterminate)
+            else if (idObject == (int)ObjId.Window && (eventType == (uint)WinEvent.ObjectCreate || eventType == (uint)WinEvent.ObjectDestroy))
             {
+                var type = hwnd.ToWindowType();
+                if (type != WindowType.DesignerWindow && type != WindowType.VbaWindow)
+                {
+                    return;                   
+                }
                 if (eventType == (uint) WinEvent.ObjectCreate)
                 {
                     AttachWindow(hwnd);
@@ -90,7 +93,7 @@ public static void VbeEventCallback(IntPtr hWinEventHook, uint eventType, IntPtr
             {
                 //Test to see if it was a selection change in the project window.
                 var parent = User32.GetParent(hwnd);
-                if (parent != IntPtr.Zero && parent.ToWindowType() == WindowType.Project)
+                if (parent != IntPtr.Zero && parent.ToWindowType() == WindowType.Project && hwnd == User32.GetFocus())
                 {
                     FocusDispatcher(_vbe, new WindowChangedEventArgs(parent, null, null, FocusType.ChildFocus));
                 }                

Rubberduck.VBEEditor/WindowsApi/SubclassingWindow.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Concurrent;
 using System.Diagnostics;
 using System.Runtime.InteropServices;
 using Rubberduck.Common.WinAPI;
@@ -12,6 +11,7 @@ public abstract class SubclassingWindow : IDisposable
         private readonly IntPtr _hwnd;
         private readonly SubClassCallback _wndProc;
         private bool _listening;
+        private GCHandle _thisHandle;
 
         private readonly object _subclassLock = new object();
 
@@ -43,7 +43,7 @@ protected SubclassingWindow(IntPtr subclassId, IntPtr hWnd)
         public void Dispose()
         {
             ReleaseHandle();
-            GC.SuppressFinalize(this);
+            //GC.SuppressFinalize(this);
         }
 
         private void AssignHandle()
@@ -55,6 +55,11 @@ private void AssignHandle()
                 {
                     throw new Exception("SetWindowSubClass Failed");
                 }
+                //DO NOT REMOVE THIS CALL. Dockable windows are instantiated by the VBE, not directly by RD.  On top of that,
+                //since we have to inherit from UserControl we don't have to keep handling window messages until the VBE gets
+                //around to destroying the control's host or it results in an access violation when the base class is disposed.
+                //We need to manually call base.Dispose() ONLY in response to a WM_DESTROY message.
+                _thisHandle = GCHandle.Alloc(this, GCHandleType.Normal);
                 _listening = true;
             }
         }
@@ -85,10 +90,10 @@ public virtual int SubClassProc(IntPtr hWnd, IntPtr msg, IntPtr wParam, IntPtr l
             }
 
             Debug.Assert(IsWindow(_hwnd));
-            //TODO: This should change to  WM.DESTROY once subclassing\hooking consolidation is complete.
-            if ((uint)msg == (uint)WM.RUBBERDUCK_SINKING)
+            if ((uint)msg == (uint)WM.RUBBERDUCK_SINKING || (uint)msg == (uint)WM.DESTROY)
             {                
                 ReleaseHandle();
+                _thisHandle.Free();
             }
             return DefSubclassProc(hWnd, msg, wParam, lParam);
         }

Rubberduck.VBEEditor/WindowsApi/User32.cs

@@ -56,6 +56,12 @@ public static class User32
         [DllImport("user32.dll")]
         public static extern IntPtr GetForegroundWindow();
 
+        [DllImport("user32.dll")]
+        public static extern IntPtr GetActiveWindow();
+
+        [DllImport("user32.dll")]
+        public static extern IntPtr GetFocus();
+
         /// <summary>
         /// Gets the underlying class name for a window handle.
         /// https://msdn.microsoft.com/en-us/library/windows/desktop/ms633582(v=vs.85).aspx