Clean up other window checking for snapping windows

Common.Wpf.csproj

@@ -182,6 +182,7 @@
     <Compile Include="Toolbar\SplitButton\SplitButton.cs" />
     <Compile Include="Windows\ControlBox.cs" />
     <Compile Include="Windows\SnappingWindow.cs" />
+    <Compile Include="Windows\WindowInformation.cs" />
   </ItemGroup>
   <ItemGroup>
     <Page Include="HtmlLabelControl\HtmlLabel.xaml">

Windows/SnappingWindow.cs

@@ -17,6 +17,7 @@ namespace Common.Wpf.Windows
 
         private HwndSource _hwndSource;
         private Structures.WindowPosition _lastWindowPosition;
+        private List<WindowInformation> _otherWindows;
 
         #endregion
 
@@ -37,7 +38,7 @@ namespace Common.Wpf.Windows
             get { return 20; }
         }
 
-        protected virtual List<Rect> OtherWindows
+        protected virtual List<WindowInformation> OtherWindows
         {
             get { return null; }
         }
@@ -88,11 +89,14 @@ namespace Common.Wpf.Windows
 
         #region Window procedure
 
-        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        protected virtual IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
         {
             if (msg == (int) Constants.WindowMessage.WindowPositionChanging)
                 return OnWindowPositionChanging(lParam, ref handled);
 
+            if (msg == (int) Constants.WindowMessage.EnterSizeMove)
+                _otherWindows = OtherWindows;
+
             return IntPtr.Zero;
         }
 
@@ -197,15 +201,15 @@ namespace Common.Wpf.Windows
                 }
             }
 
-            var otherWindows = OtherWindows;
+            var otherWindows = _otherWindows;
 
             if (otherWindows != null && otherWindows.Count > 0)
             {
                 // Loop over all other windows looking to see if we should stick
-                foreach (Rect otherWindow in otherWindows)
+                foreach (var otherWindow in otherWindows)
                 {
                     // Get a rectangle with the bounds of the other window
-                    var otherWindowRect = new Rectangle(Convert.ToInt32(otherWindow.Left), Convert.ToInt32(otherWindow.Top), Convert.ToInt32(otherWindow.Width), Convert.ToInt32(otherWindow.Height));
+                    var otherWindowRect = otherWindow.Location;                        
 
                     // Check the current window left against the other window right
                     var otherWindowSnapBorder = new Rectangle(otherWindowRect.Right, otherWindowRect.Top, snapDistance, otherWindowRect.Height);

Windows/WindowInformation.cs

@@ -0,0 +1,30 @@
+using Common.Native;
+using System;
+using System.Drawing;
+
+namespace Common.Wpf.Windows
+{
+    public class WindowInformation
+    {
+        public IntPtr Handle { get; private set; }
+        public Rectangle Location { get; private set; }
+
+        public WindowInformation(IntPtr handle)
+        {
+            Handle = handle;
+
+            var windowPlacement = new Structures.WindowPlacement();
+            Functions.User32.GetWindowPlacement(Handle, ref windowPlacement);
+
+            var normalPosition = windowPlacement.NormalPosition;
+
+            Location = new Rectangle(normalPosition.X, normalPosition.Y, normalPosition.Width, normalPosition.Height);
+        }
+
+        public WindowInformation(IntPtr handle, Rectangle location)
+        {
+            Handle = handle;
+            Location = location;
+        }
+    }
+}