Add wxNativeWindow allowing to easily embed native widgets in wx.

Implement the class for wxMSW, wxGTK and wxOSX/Cocoa, show it in the widgets
sample and add documentation for it.

samples/widgets/Makefile.in

@@ -22,6 +22,7 @@ LIBS = @LIBS@
 LDFLAGS_GUI = @LDFLAGS_GUI@
 CXX = @CXX@
 CXXFLAGS = @CXXFLAGS@
+OBJCXXFLAGS = @OBJCXXFLAGS@
 CPPFLAGS = @CPPFLAGS@
 LDFLAGS = @LDFLAGS@
 WX_LIB_FLAVOUR = @WX_LIB_FLAVOUR@
@@ -49,6 +50,10 @@ WIDGETS_CXXFLAGS = -D__WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p) $(__DEBUG_DEFINE_p) \
 	$(__EXCEPTIONS_DEFINE_p) $(__RTTI_DEFINE_p) $(__THREAD_DEFINE_p) \
 	-I$(srcdir) $(__DLLFLAG_p) -I$(srcdir)/../../samples $(CXXWARNINGS) \
 	$(SAMPLES_CXXFLAGS) $(CPPFLAGS) $(CXXFLAGS)
+WIDGETS_OBJCXXFLAGS = -D__WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p) \
+	$(__DEBUG_DEFINE_p) $(__EXCEPTIONS_DEFINE_p) $(__RTTI_DEFINE_p) \
+	$(__THREAD_DEFINE_p) -I$(srcdir) $(__DLLFLAG_p) -I$(srcdir)/../../samples \
+	$(CPPFLAGS) $(OBJCXXFLAGS)
 WIDGETS_OBJECTS =  \
 	widgets_activityindicator.o \
 	widgets_bmpcombobox.o \
@@ -68,6 +73,8 @@ WIDGETS_OBJECTS =  \
 	widgets_hyperlnk.o \
 	widgets_itemcontainer.o \
 	widgets_listbox.o \
+	$(__NATIVE_OBJCPP_SRC_OBJECTS) \
+	widgets_native.o \
 	widgets_notebook.o \
 	widgets_odcombobox.o \
 	widgets_radiobox.o \
@@ -131,6 +138,8 @@ COND_PLATFORM_OS2_1___widgets___os2_emxbindcmd = $(NM) widgets$(EXEEXT) | if \
 @COND_TOOLKIT_OSX_IPHONE@	= $(__widgets_app_Contents_PkgInfo___depname)
 @COND_TOOLKIT_COCOA@____widgets_BUNDLE_TGT_REF_DEP = \
 @COND_TOOLKIT_COCOA@	$(__widgets_app_Contents_PkgInfo___depname)
+@COND_TOOLKIT_OSX_COCOA_WXUNIV_0@__NATIVE_OBJCPP_SRC_OBJECTS \
+@COND_TOOLKIT_OSX_COCOA_WXUNIV_0@	= widgets_native_wrapper.o
 COND_MONOLITHIC_0___WXLIB_ADV_p = \
 	-lwx_$(PORTNAME)$(WXUNIVNAME)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_adv-$(WX_RELEASE)$(HOST_SUFFIX)
 @COND_MONOLITHIC_0@__WXLIB_ADV_p = $(COND_MONOLITHIC_0___WXLIB_ADV_p)
@@ -265,6 +274,12 @@ widgets_itemcontainer.o: $(srcdir)/itemcontainer.cpp
 widgets_listbox.o: $(srcdir)/listbox.cpp
 	$(CXXC) -c -o $@ $(WIDGETS_CXXFLAGS) $(srcdir)/listbox.cpp
 
+widgets_native_wrapper.o: $(srcdir)/native_wrapper.mm
+	$(CXXC) -c -o $@ $(WIDGETS_OBJCXXFLAGS) $(srcdir)/native_wrapper.mm
+
+widgets_native.o: $(srcdir)/native.cpp
+	$(CXXC) -c -o $@ $(WIDGETS_CXXFLAGS) $(srcdir)/native.cpp
+
 widgets_notebook.o: $(srcdir)/notebook.cpp
 	$(CXXC) -c -o $@ $(WIDGETS_CXXFLAGS) $(srcdir)/notebook.cpp