1 // NasalCanvas.cxx -- expose Canvas classes to Nasal
3 // Written by James Turner, started 2012.
5 // Copyright (C) 2012 James Turner
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
28 #include "NasalCanvas.hxx"
29 #include <Canvas/canvas_mgr.hxx>
30 #include <Main/globals.hxx>
32 //#include <boost/python.hpp>
33 #include <boost/foreach.hpp>
34 #include <boost/function.hpp>
35 #include <boost/utility/enable_if.hpp>
36 #include <boost/algorithm/string/case_conv.hpp>
37 #include <boost/make_shared.hpp>
38 #include <osgGA/GUIEventAdapter>
40 #include <simgear/sg_inlines.h>
42 #include <simgear/canvas/Canvas.hxx>
43 #include <simgear/canvas/elements/CanvasElement.hxx>
45 #include <simgear/nasal/cppbind/to_nasal.hxx>
46 #include <simgear/nasal/cppbind/NasalHash.hxx>
48 extern naRef propNodeGhostCreate(naContext c, SGPropertyNode* n);
50 //void initCanvasPython()
52 // using namespace boost::python;
53 // class_<simgear::canvas::Canvas>("Canvas");
56 namespace sc = simgear::canvas;
58 naRef canvasGetNode(naContext c, sc::Canvas* canvas)
60 return propNodeGhostCreate(c, canvas->getProps());
69 typedef boost::false_type::type is_shared;
74 struct class_traits<boost::shared_ptr<T> >
76 typedef boost::true_type::type is_shared;
81 struct class_traits<osg::ref_ptr<T> >
83 typedef boost::true_type::type is_shared;
88 struct class_traits<SGSharedPtr<T> >
90 typedef boost::true_type::type is_shared;
95 struct SharedPointerPolicy
97 typedef typename class_traits<T>::raw_type raw_type;
100 * Create a shared pointer on the heap to handle the reference counting for
101 * the passed shared pointer while it is used in Nasal space.
103 static T* createInstance(const T& ptr)
108 static raw_type* getRawPtr(void* ptr)
110 return static_cast<T*>(ptr)->get();
115 struct RawPointerPolicy
117 typedef typename class_traits<T>::raw_type raw_type;
119 static T* createInstance()
124 static raw_type* getRawPtr(void* ptr)
126 BOOST_STATIC_ASSERT((boost::is_same<raw_type, T>::value));
127 return static_cast<T*>(ptr);
134 void addNasalBase(const naRef& parent)
136 assert( naIsHash(parent) );
137 _parents.push_back(parent);
141 const std::string _name;
142 naGhostType _ghost_type;
143 std::vector<class_metadata*> _base_classes;
144 std::vector<naRef> _parents;
146 explicit class_metadata(const std::string& name):
152 void addBaseClass(class_metadata* base)
155 std::cout << _name << ": addBase(" << base->_name << ")" << std::endl;
156 _base_classes.push_back(base);
159 naRef getParents(naContext c)
161 return nasal::to_nasal(c, _parents);
166 * Class for exposing C++ objects to Nasal
170 public class_metadata,
171 protected boost::mpl::if_< typename class_traits<T>::is_shared,
172 SharedPointerPolicy<T>,
173 RawPointerPolicy<T> >::type
176 typedef typename class_traits<T>::raw_type raw_type;
180 typedef boost::function<naRef(naContext c, raw_type*)> getter_t;
181 typedef std::map<std::string, getter_t> GetterMap;
183 static class_& init(const std::string& name)
185 getSingletonHolder().reset( new class_(name) );
186 return *getSingletonPtr();
189 static naRef f_create(naContext c, naRef me, int argc, naRef* args)
194 static naRef create( naContext c )
196 return makeGhost(c, class_::createInstance());
199 // TODO use variadic template when supporting C++11
201 static naRef create( naContext c, const A1& a1 )
203 return makeGhost(c, class_::createInstance(a1));
206 class_& bases(const naRef& parent)
208 addNasalBase(parent);
213 typename boost::enable_if
214 < boost::is_convertible<Base, class_metadata>,
219 Base* base = Base::getSingletonPtr();
220 addBaseClass( base );
222 // Replace any getter that is not available in the current class.
223 // TODO check if this is the correct behavior of function overriding
224 const typename Base::GetterMap& base_getter = base->getGetter();
225 for( typename Base::GetterMap::const_iterator getter =
227 getter != base_getter.end();
230 if( _getter.find(getter->first) == _getter.end() )
231 _getter.insert( *getter );
238 typename boost::enable_if_c
239 < !boost::is_convertible< Type, class_metadata>::value,
244 return bases< class_<Type> >();
248 class_& member( const std::string& field,
249 Var (raw_type::*getter)() const,
250 void (raw_type::*setter)(const Var&) = 0 )
252 naRef (*to_nasal)(naContext, Var) = &nasal::to_nasal;
253 _getter[field] = boost::bind( to_nasal,
255 boost::bind(getter, _2) );
259 class_& member( const std::string& field,
260 const getter_t& getter )
262 _getter[field] = getter;
266 static class_* getSingletonPtr()
268 return getSingletonHolder().get();
271 const GetterMap& getGetter() const
278 typedef std::auto_ptr<class_> class_ptr;
281 explicit class_(const std::string& name):
282 class_metadata( name )
284 _ghost_type.destroy = &destroyGhost;
285 _ghost_type.name = _name.c_str();
286 _ghost_type.get_member = &getMember;
287 _ghost_type.set_member = 0;
290 static class_ptr& getSingletonHolder()
292 static class_ptr instance;
296 static naRef makeGhost(naContext c, void *ptr)
298 std::cout << "makeGhost " << ptr << std::endl;
299 return naNewGhost2(c, &getSingletonPtr()->_ghost_type, ptr);
302 static void destroyGhost(void *ptr)
304 std::cout << "destroyGhost " << ptr << std::endl;
308 static const char* getMember(naContext c, void* g, naRef field, naRef* out)
310 const std::string key = naStr_data(field);
311 if( key == "parents" )
313 if( getSingletonPtr()->_parents.empty() )
316 *out = getSingletonPtr()->getParents(c);
320 typename GetterMap::iterator getter =
321 getSingletonPtr()->_getter.find(key);
323 if( getter == getSingletonPtr()->_getter.end() )
326 *out = getter->second(c, class_::getRawPtr(g));
347 typedef nasal::class_<sc::CanvasPtr> NasalCanvas;
352 NasalCanvas::init("Canvas")
353 .member("_node_ghost", &canvasGetNode)
354 .member("size_x", &sc::Canvas::getSizeX)
355 .member("size_y", &sc::Canvas::getSizeY);
356 nasal::class_<sc::ElementPtr>::init("canvas.Element");
357 nasal::class_<sc::GroupPtr>::init("canvas.Group")
358 .bases<sc::ElementPtr>();
360 nasal::class_<Base>::init("BaseClass")
361 .member("int", &Base::getInt);
362 nasal::class_<Test>::init("TestClass")
368 * Class for exposing C++ objects to Nasal
370 template<class T, class Derived>
374 // TODO use variadic template when supporting C++11
376 static naRef create( naContext c, const A1& a1 )
378 return makeGhost(c, new T(a1));
381 template<class A1, class A2>
382 static naRef create( naContext c, const A1& a1,
385 return makeGhost(c, new T(a1, a2));
388 template<class A1, class A2, class A3>
389 static naRef create( naContext c, const A1& a1,
393 return makeGhost(c, new T(a1, a2, a3));
396 template<class A1, class A2, class A3, class A4>
397 static naRef create( naContext c, const A1& a1,
402 return makeGhost(c, new T(a1, a2, a3, a4));
405 template<class A1, class A2, class A3, class A4, class A5>
406 static naRef create( naContext c, const A1& a1,
412 return makeGhost(c, new T(a1, a2, a3, a4, a5));
415 // TODO If you need more arguments just do some copy&paste :)
417 static Derived& getInstance()
419 static Derived instance;
423 void setParent(const naRef& parent)
425 // TODO check if we need to take care of reference counting/gc
427 _parents[0] = parent;
432 // TODO switch to boost::/std::function (with C++11 lambdas this can make
433 // adding setters easier and shorter)
434 typedef naRef (Derived::*getter_t)(naContext, const T&);
435 typedef std::map<std::string, getter_t> GetterMap;
437 const std::string _ghost_name;
438 std::vector<naRef> _parents;
441 NasalObject(const std::string& ghost_name):
442 _ghost_name( ghost_name )
444 _ghost_type.destroy = &destroyGhost;
445 _ghost_type.name = _ghost_name.c_str();
446 _ghost_type.get_member = &Derived::getMember;
447 _ghost_type.set_member = 0;
449 _getter["parents"] = &NasalObject::getParents;
452 naRef getParents(naContext c, const T&)
454 naRef parents = naNewVector(c);
455 for(size_t i = 0; i < _parents.size(); ++i)
456 naVec_append(parents, _parents[i]);
460 static naRef makeGhost(naContext c, void *ptr)
462 std::cout << "create " << ptr << std::endl;
463 return naNewGhost2(c, &(getInstance()._ghost_type), ptr);
466 static void destroyGhost(void *ptr)
468 std::cout << "destroy " << ptr << std::endl;
472 static const char* getMember(naContext c, void* g, naRef field, naRef* out)
474 typename GetterMap::iterator getter =
475 getInstance()._getter.find(naStr_data(field));
477 if( getter == getInstance()._getter.end() )
480 *out = (getInstance().*getter->second)(c, *static_cast<T*>(g));
486 naGhostType _ghost_type;
490 typedef osg::ref_ptr<osgGA::GUIEventAdapter> GUIEventPtr;
492 class NasalCanvasEvent:
493 public NasalObject<GUIEventPtr, NasalCanvasEvent>
498 NasalObject("CanvasEvent")
500 _getter["type"] = &NasalCanvasEvent::getEventType;
503 naRef getEventType(naContext c, const GUIEventPtr& event)
505 #define RET_EVENT_STR(type, str)\
506 case osgGA::GUIEventAdapter::type:\
507 return nasal::to_nasal(c, str);
509 switch( event->getEventType() )
511 RET_EVENT_STR(PUSH, "push");
512 RET_EVENT_STR(RELEASE, "release");
513 RET_EVENT_STR(DOUBLECLICK, "double-click");
514 RET_EVENT_STR(DRAG, "drag");
515 RET_EVENT_STR(MOVE, "move");
516 RET_EVENT_STR(SCROLL, "scroll");
517 RET_EVENT_STR(KEYUP, "key-up");
518 RET_EVENT_STR(KEYDOWN, "key-down");
529 static const char* eventGhostGetMember(naContext c, void* g, naRef field, naRef* out)
531 const char* fieldName = naStr_data(field);
532 osgGA::GUIEventAdapter* gea = (osgGA::GUIEventAdapter*) g;
534 if (!strcmp(fieldName, "windowX")) *out = naNum(gea->getWindowX());
535 else if (!strcmp(fieldName, "windowY")) *out = naNum(gea->getWindowY());
536 else if (!strcmp(fieldName, "time")) *out = naNum(gea->getTime());
537 else if (!strcmp(fieldName, "button")) *out = naNum(gea->getButton());
545 static naRef f_element_addButtonCallback(naContext c, naRef me, int argc, naRef* args)
547 simgear::canvas::Element* e = elementGhost(me);
549 naRuntimeError(c, "element.addButtonCallback called on non-canvas-element object");
555 static naRef f_element_addDragCallback(naContext c, naRef me, int argc, naRef* args)
557 simgear::canvas::Element* e = elementGhost(me);
559 naRuntimeError(c, "element.addDragCallback called on non-canvas-element object");
565 static naRef f_element_addMoveCallback(naContext c, naRef me, int argc, naRef* args)
567 simgear::canvas::Element* e = elementGhost(me);
569 naRuntimeError(c, "element.addMoveCallback called on non-canvas-element object");
575 static naRef f_element_addScrollCallback(naContext c, naRef me, int argc, naRef* args)
577 simgear::canvas::Element* e = elementGhost(me);
579 naRuntimeError(c, "element.addScrollCallback called on non-canvas-element object");
586 static naRef f_createCanvas(naContext c, naRef me, int argc, naRef* args)
588 std::cout << "f_createCanvas" << std::endl;
590 CanvasMgr* canvas_mgr =
591 static_cast<CanvasMgr*>(globals->get_subsystem("Canvas"));
595 return NasalCanvas::create(c, canvas_mgr->createCanvas());
598 naRef initNasalCanvas(naRef globals, naContext c, naRef gcSave)
601 hashset(c, gcSave, "canvasProto", canvasPrototype);
603 hashset(c, canvasPrototype, "getElement", naNewFunc(c, naNewCCode(c, f_canvas_getElement)));*/
604 // set any event methods
607 elementPrototype = naNewHash(c);
608 hashset(c, gcSave, "elementProto", elementPrototype);
610 hashset(c, elementPrototype, "addButtonCallback", naNewFunc(c, naNewCCode(c, f_element_addButtonCallback)));
611 hashset(c, elementPrototype, "addDragCallback", naNewFunc(c, naNewCCode(c, f_element_addDragCallback)));
612 hashset(c, elementPrototype, "addMoveCallback", naNewFunc(c, naNewCCode(c, f_element_addMoveCallback)));
613 hashset(c, elementPrototype, "addScrollCallback", naNewFunc(c, naNewCCode(c, f_element_addScrollCallback)));
615 nasal::Hash globals_module(globals, c),
616 canvas_module = globals_module.createHash("canvas");
618 canvas_module.set("_new", f_createCanvas);
619 canvas_module.set("testClass", nasal::class_<Test>::f_create);