[gtk+] win32: in window_at_pointer, ensure that we handle non-client areas correctly

[Alexander Larsson <alexl src gnome org>]

commit 321acc3286289b94322b3799d993fd8781b3a306
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Oct 19 16:15:17 2011 +0200

    win32: in window_at_pointer, ensure that we handle non-client areas correctly
    
    We should not return a window if the pointer is in the non-client area,
    like the titlebar.

 gdk/win32/gdkdevice-win32.c |   23 ++++++++++++++++++-----
 1 files changed, 18 insertions(+), 5 deletions(-)
---
diff --git a/gdk/win32/gdkdevice-win32.c b/gdk/win32/gdkdevice-win32.c
index 27bf807..09ec36a 100644
--- a/gdk/win32/gdkdevice-win32.c
+++ b/gdk/win32/gdkdevice-win32.c
@@ -384,6 +384,16 @@ gdk_device_win32_window_at_position (GdkDevice       *device,
         screen_to_client (hwnd, screen_pt, &client_pt);
         hwndc = ChildWindowFromPointEx (hwnd, client_pt, CWP_SKIPDISABLED  |
                                                          CWP_SKIPINVISIBLE);
+
+	/* Verify that we're really inside the client area of the window */
+	if (hwndc != hwnd)
+	  {
+	    GetClientRect (hwndc, &rect);
+	    screen_to_client (hwndc, screen_pt, &client_pt);
+	    if (!PtInRect (&rect, client_pt))
+	      hwndc = hwnd;
+	  }
+
       } while (hwndc != hwnd && (hwnd = hwndc, 1));
 
     }
@@ -391,6 +401,12 @@ gdk_device_win32_window_at_position (GdkDevice       *device,
     {
       hwnd = WindowFromPoint (screen_pt);
 
+      /* Verify that we're really inside the client area of the window */
+      GetClientRect (hwnd, &rect);
+      screen_to_client (hwnd, screen_pt, &client_pt);
+      if (!PtInRect (&rect, client_pt))
+	hwnd = NULL;
+
       /* If we didn't hit any window at that point, return the desktop */
       if (hwnd == NULL)
         {
@@ -406,13 +422,10 @@ gdk_device_win32_window_at_position (GdkDevice       *device,
 
   if (window && (win_x || win_y))
     {
-      screen_to_client (hwnd, screen_pt, &client_pt);
-      GetClientRect (hwnd, &rect);
-
       if (win_x)
-        *win_x = client_pt.x - rect.left;
+        *win_x = client_pt.x;
       if (win_y)
-        *win_y = client_pt.y - rect.top;
+        *win_y = client_pt.y;
     }
 
   return window;