cad/freecad: optionize SpaceMouse support

Originially, FreeCAD picked up libspnav (SpaceMouse) support
when the library was present in the system during build. That
alone would be a minor problem, but people still insist on
building in unclean systems.
Additionally, libspnav support in FreeCAD was broken and resulted
in build failure when accidentially building with libspnav (see
above).
Upstream fixed this in a series of changes touching many places
and sometimes even depending on otherwise unrelated changes:
importing all that would be close to updating to a snapshot.
Instead, adopt the relevant fix for building with libspnav from
upstream, and put the whole libspnav detection behind a cmake
option (made accessible as a port option).

PR:		285542
Reported by:	Chad Jacob Milios

2 files changed, 99 insertions, 2 deletions

diff --git a/cad/freecad/Makefile b/cad/freecad/Makefile
index 4f8d87554a63..b10760856548 100644
--- a/cad/freecad/Makefile
+++ b/cad/freecad/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	FreeCAD
 DISTVERSION=	1.0.0
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	cad
 
 MAINTAINER=	cmt@FreeBSD.org
@@ -102,10 +102,13 @@ CMAKE_ARGS+=	-DOCC_INCLUDE_DIR="${LOCALBASE}/include/OpenCASCADE" \
 
 CMAKE_INSTALL_PREFIX=	${PREFIX}/${PORTNAME}
 
-OPTIONS_DEFINE=	COLLADA
+OPTIONS_DEFINE=	COLLADA SPNAV
 
 COLLADA_DESC=		Install pycollada for Collada files import
 COLLADA_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pycollada>0:graphics/py-pycollada@${PY_FLAVOR}
+SPNAV_DESC=		Enable libspnav (SpaceMouse) support
+SPNAV_CMAKE_BOOL=	FREECAD_SPNAV_SUPPORT
+SPNAV_LIB_DEPENDS=	libspnav.so:misc/libspnav
 
 .include <bsd.port.options.mk>
 
diff --git a/cad/freecad/files/patch-spnav-support b/cad/freecad/files/patch-spnav-support
new file mode 100644
index 000000000000..e9b364d61f60
--- /dev/null
+++ b/cad/freecad/files/patch-spnav-support
@@ -0,0 +1,94 @@
+commit f2b872ba4dc509622bda2d86ce42e2464d40832b
+Author: Christoph Moench-Tegeder <cmt@burggraben.net>
+Date:   Mon Mar 24 01:03:53 2025 +0100
+
+    attempt to fix building with libspnav
+
+diff --git cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake
+index e9aa47fd6e..826c510ef0 100644
+--- cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake
++++ cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake
+@@ -142,6 +142,7 @@ macro(InitializeFreeCADBuildOptions)
+     option(BUILD_CLOUD "Build the FreeCAD cloud module" OFF)
+     option(ENABLE_DEVELOPER_TESTS "Build the FreeCAD unit tests suit" ON)
+ 
++    option(FREECAD_SPNAV_SUPPORT "Enable libspnav support" OFF)
+     if(MSVC)
+         set(FREECAD_3DCONNEXION_SUPPORT "NavLib" CACHE STRING "Select version of the 3Dconnexion device integration")
+         set_property(CACHE FREECAD_3DCONNEXION_SUPPORT PROPERTY STRINGS "NavLib" "Raw input")
+diff --git src/Gui/CMakeLists.txt src/Gui/CMakeLists.txt
+index 642f58568f..52cc393875 100644
+--- src/Gui/CMakeLists.txt
++++ src/Gui/CMakeLists.txt
+@@ -133,7 +133,8 @@ if(${Qt5WinExtras_FOUND})
+     )
+ endif()
+ 
+-IF(SPNAV_FOUND)
++IF(FREECAD_SPNAV_SUPPORT AND SPNAV_FOUND)
++    add_definitions(-D_USE_3DCONNEXION_SDK)
+     if(SPNAV_USE_X11)
+         add_definitions(-DSPNAV_USE_X11)
+         if (FREECAD_QT_MAJOR_VERSION EQUAL 5 AND UNIX AND NOT APPLE)
+@@ -175,7 +176,11 @@ IF(SPNAV_FOUND)
+     list(APPEND FreeCADGui_LIBS
+         ${SPNAV_LIBRARIES}
+     )
+-ENDIF(SPNAV_FOUND)
++ENDIF(FREECAD_SPNAV_SUPPORT AND SPNAV_FOUND)
++
++IF(FREECAD_SPNAV_SUPPORT AND NOT SPNAV_FOUND)
++    MESSAGE(FATAL_ERROR "libspnav support requested but libspnav not found")
++ENDIF(FREECAD_SPNAV_SUPPORT AND NOT SPNAV_FOUND)
+ 
+ IF(OCULUS_FOUND)
+     add_definitions(-DOCULUS_FOUND)
+diff --git src/Gui/GuiApplicationNativeEventAware.cpp src/Gui/GuiApplicationNativeEventAware.cpp
+index ba41901472..c0cf3c7666 100644
+--- src/Gui/GuiApplicationNativeEventAware.cpp
++++ src/Gui/GuiApplicationNativeEventAware.cpp
+@@ -33,7 +33,7 @@
+ 
+ 
+ #if defined(_USE_3DCONNEXION_SDK) || defined(SPNAV_FOUND)
+-#if defined(Q_OS_LINUX)
++#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD)
+   #if defined(SPNAV_USE_X11)
+     #include "3Dconnexion/GuiNativeEventLinuxX11.h"
+   #else
+@@ -59,7 +59,15 @@ Gui::GUIApplicationNativeEventAware::~GUIApplicationNativeEventAware() = default
+ void Gui::GUIApplicationNativeEventAware::initSpaceball(QMainWindow *window)
+ {
+ #if defined(_USE_3DCONNEXION_SDK) || defined(SPNAV_FOUND)
++# if defined(USE_3DCONNEXION_NAVLIB)
++    ParameterGrp::handle hViewGrp = App::GetApplication().GetParameterGroupByPath(
++        "User parameter:BaseApp/Preferences/View");
++    if (nativeEvent && hViewGrp->GetBool("LegacySpaceMouseDevices", false)) {
++        nativeEvent->initSpaceball(window);
++    }
++# else
+     nativeEvent->initSpaceball(window);
++# endif
+ #else
+     Q_UNUSED(window);
+ #endif
+diff --git src/Gui/View3DInventorViewer.cpp src/Gui/View3DInventorViewer.cpp
+index 694f834583..d32c2486b5 100644
+--- src/Gui/View3DInventorViewer.cpp
++++ src/Gui/View3DInventorViewer.cpp
+@@ -555,7 +555,15 @@ void View3DInventorViewer::init()
+     //filter a few qt events
+     viewerEventFilter = new ViewerEventFilter;
+     installEventFilter(viewerEventFilter);
++#if defined(USE_3DCONNEXION_NAVLIB)
++    ParameterGrp::handle hViewGrp = App::GetApplication().GetParameterGroupByPath(
++        "User parameter:BaseApp/Preferences/View");
++    if (hViewGrp->GetBool("LegacySpaceMouseDevices", false)) {
++        getEventFilter()->registerInputDevice(new SpaceNavigatorDevice);
++    }
++#else
+     getEventFilter()->registerInputDevice(new SpaceNavigatorDevice);
++#endif
+     getEventFilter()->registerInputDevice(new GesturesDevice(this));
+ 
+     try{