Move canvas::AlignmentFlag to separate file.

Mapping in a separate file allows easier exposing of
values and string representation to Nasal.

simgear/canvas/layout/AlignFlag_values.hxx

@@ -0,0 +1,43 @@
+///@file
+/// Enumeration of layout alignment flags.
+//
+// Copyright (C) 2014  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#ifndef ALIGN_ENUM_MAPPING
+# error "Only include with ALIGN_ENUM_MAPPING defined!"
+#endif
+
+ALIGN_ENUM_MAPPING(AlignFill, 0, Use all available space)
+
+ALIGN_ENUM_MAPPING(AlignLeft, 0x01, Align with left edge)
+ALIGN_ENUM_MAPPING(AlignRight, 0x02, Align with right edge)
+ALIGN_ENUM_MAPPING(AlignHCenter, 0x04, Center horizontally in available space)
+
+ALIGN_ENUM_MAPPING(AlignTop, 0x20, Align with top edge)
+ALIGN_ENUM_MAPPING(AlignBottom, 0x40, Align with bottom edge)
+ALIGN_ENUM_MAPPING(AlignVCenter, 0x80, Center vertically in available space)
+
+ALIGN_ENUM_MAPPING( AlignCenter,
+                    AlignVCenter | AlignHCenter,
+                    Center both vertically and horizontally )
+
+ALIGN_ENUM_MAPPING( AlignHorizontal_Mask,
+                    AlignLeft | AlignRight | AlignHCenter,
+                    Mask of all horizontal alignment flags )
+ALIGN_ENUM_MAPPING( AlignVertical_Mask,
+                    AlignTop | AlignBottom | AlignVCenter,
+                    Mask of all vertical alignment flags )

simgear/canvas/layout/CMakeLists.txt

@@ -1,6 +1,7 @@
 include (SimGearComponent)
 
 set(HEADERS
+  AlignFlag_values.hxx
   BoxLayout.hxx
   Layout.hxx
   LayoutItem.hxx

simgear/canvas/layout/LayoutItem.hxx

@@ -89,25 +89,9 @@ namespace canvas
    */
   enum AlignmentFlag
   {
-    AlignFill = 0,            //!< Use all available space
-
-    AlignLeft = 0x01,         //!< Align with left edge
-    AlignRight = 0x02,        //!< Align with right edge
-    AlignHCenter = 0x04,      //!< Center horizontally in available space
-
-    AlignTop = 0x20,          //!< Align with top edge
-    AlignBottom = 0x40,       //!< Align with bottom edge
-    AlignVCenter = 0x80,      //!< Center vertically in available space
-
-    AlignCenter = AlignVCenter  //!< Center both vertically and horizontally
-                | AlignHCenter,
-
-    AlignHorizontal_Mask = AlignLeft
-                         | AlignRight
-                         | AlignHCenter,
-    AlignVertical_Mask = AlignTop
-                       | AlignBottom
-                       | AlignVCenter
+#define ALIGN_ENUM_MAPPING(key, val, comment) key = val, /*!< comment */
+#  include "AlignFlag_values.hxx"
+#undef ALIGN_ENUM_MAPPING
   };
 
   /**