1 // Interface for 2D Canvas elements
3 // Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Library General Public
7 // License as published by the Free Software Foundation; either
8 // version 2 of the License, or (at your option) any later version.
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Library General Public License for more details.
15 // You should have received a copy of the GNU Library General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 #ifndef CANVAS_ELEMENT_HXX_
20 #define CANVAS_ELEMENT_HXX_
22 #include <simgear/canvas/canvas_fwd.hxx>
23 #include <simgear/canvas/CanvasEvent.hxx>
24 #include <simgear/props/PropertyBasedElement.hxx>
25 #include <simgear/misc/stdint.hxx> // for uint32_t
26 #include <simgear/nasal/cppbind/Ghost.hxx>
28 #include <osg/BoundingBox>
29 #include <osg/MatrixTransform>
31 #include <boost/bind.hpp>
32 #include <boost/function.hpp>
45 public PropertyBasedElement
48 typedef boost::function<bool(Element&, const SGPropertyNode*)>
50 typedef boost::function<void(Element&, const SGPropertyNode*)>
51 StyleSetterFuncUnchecked;
56 SGSharedPtr<StyleSetter> next;
60 StyleSetter setter; ///!< Function(s) for setting this style
61 std::string type; ///!< Interpolation type
65 * Remove the property listener of the element.
67 * You will need to call the appropriate methods (#childAdded,
68 * #childRemoved, #valueChanged) yourself to ensure the element still
69 * receives the needed events.
71 void removeListener();
76 virtual ~Element() = 0;
78 ElementWeakPtr getWeakPtr() const;
81 * Called every frame to update internal state
83 * @param dt Frame time in seconds
85 virtual void update(double dt);
87 naRef addEventListener(const nasal::CallContext& ctx);
89 virtual bool accept(EventVisitor& visitor);
90 virtual bool ascend(EventVisitor& visitor);
91 virtual bool traverse(EventVisitor& visitor);
93 virtual bool handleEvent(canvas::EventPtr event);
95 virtual bool hitBound( const osg::Vec2f& pos,
96 const osg::Vec2f& local_pos ) const;
99 * Get whether the element is visible or hidden (Can be changed with
100 * setting property "visible" accordingly).
102 bool isVisible() const;
104 osg::ref_ptr<osg::MatrixTransform> getMatrixTransform();
106 virtual void childAdded( SGPropertyNode * parent,
107 SGPropertyNode * child );
108 virtual void childRemoved( SGPropertyNode * parent,
109 SGPropertyNode * child );
110 virtual void valueChanged(SGPropertyNode * child);
112 virtual bool setStyle(const SGPropertyNode* child);
117 * @note Only "rect(<top>, <right>, <bottom>, <left>)" is supported
118 * @see http://www.w3.org/TR/CSS21/visufx.html#propdef-clip
120 void setClip(const std::string& clip);
123 * Write the given bounding box to the property tree
125 void setBoundingBox(const osg::BoundingBox& bb);
128 * Get bounding box with children/drawables transformed by passed matrix
130 virtual osg::BoundingBox getTransformedBounds(const osg::Matrix& m) const;
137 LAST_ATTRIBUTE = BLEND_FUNC << 1
149 CanvasWeakPtr _canvas;
152 uint32_t _attributes_dirty;
154 bool _transform_dirty;
155 osg::ref_ptr<osg::MatrixTransform> _transform;
156 std::vector<TransformType> _transform_types;
159 std::vector<SGPropertyNode_ptr> _bounding_box;
161 typedef std::vector<EventListenerPtr> Listener;
162 typedef std::map<Event::Type, Listener> ListenerMap;
164 ListenerMap _listener;
166 typedef std::map<std::string, StyleInfo> StyleSetters;
167 static StyleSetters _style_setters;
169 Element( const CanvasWeakPtr& canvas,
170 const SGPropertyNode_ptr& node,
171 const Style& parent_style,
175 * Returns false on first call and true on any successive call. Use to
176 * perform initialization tasks which are only required once per element
179 * @tparam Derived (Derived) class type
181 template<class Derived>
184 static bool is_init = false;
193 * Register a function for setting a style specified by the given property
195 * @param name Property name
196 * @param type Interpolation type
197 * @param setter Setter function
199 * @tparam T1 Type of value used to retrieve value from property
201 * @tparam T2 Type of value the setter function expects
202 * @tparam Derived Type of class the setter can be applied to
204 * @note T1 needs to be convertible to T2
212 addStyle( const std::string& name,
213 const std::string& type,
214 const boost::function<void (Derived&, T2)>& setter )
216 StyleInfo& style_info = _style_setters[ name ];
219 if( !style_info.type.empty() && type != style_info.type )
224 "changing animation type for '" << name << "': "
225 << style_info.type << " -> " << type
228 style_info.type = type;
231 StyleSetter* style = &style_info.setter;
235 style = style->next = new StyleSetter;
237 style->func = boost::bind
239 &type_match<Derived>::call,
242 bindStyleSetter<T1>(name, setter)
252 addStyle( const std::string& name,
253 const std::string& type,
254 const boost::function<void (Derived&, T)>& setter )
256 return addStyle<T, T>(name, type, setter);
264 addStyle( const std::string& name,
265 const std::string& type,
266 void (Derived::*setter)(T) )
268 return addStyle<T, T>
272 boost::function<void (Derived&, T)>(setter)
282 addStyle( const std::string& name,
283 const std::string& type,
284 void (Derived::*setter)(T2) )
290 boost::function<void (Derived&, T2)>(setter)
298 addStyle( const std::string& name,
299 const std::string& type,
300 void (Derived::*setter)(const std::string&) )
302 return addStyle<const char*, const std::string&>
306 boost::function<void (Derived&, const std::string&)>(setter)
317 addStyle( const std::string& name,
318 const std::string& type,
319 void (Other::*setter)(T),
320 OtherRef Derived::*instance_ref )
322 return addStyle<T, T>(name, type, bindOther(setter, instance_ref));
333 addStyle( const std::string& name,
334 const std::string& type,
335 void (Other::*setter)(T2),
336 OtherRef Derived::*instance_ref )
338 return addStyle<T1>(name, type, bindOther(setter, instance_ref));
349 addStyle( const std::string& name,
350 const std::string& type,
351 const boost::function<void (Other&, T2)>& setter,
352 OtherRef Derived::*instance_ref )
354 return addStyle<T1>(name, type, bindOther(setter, instance_ref));
363 addStyle( const std::string& name,
364 const std::string& type,
365 void (Other::*setter)(const std::string&),
366 OtherRef Derived::*instance_ref )
368 return addStyle<const char*, const std::string&>
372 boost::function<void (Other&, const std::string&)>(setter),
377 template<typename T, class Derived, class Other, class OtherRef>
378 boost::function<void (Derived&, T)>
379 bindOther( void (Other::*setter)(T), OtherRef Derived::*instance_ref )
381 return boost::bind(setter, boost::bind(instance_ref, _1), _2);
384 template<typename T, class Derived, class Other, class OtherRef>
385 boost::function<void (Derived&, T)>
386 bindOther( const boost::function<void (Other&, T)>& setter,
387 OtherRef Derived::*instance_ref )
394 &reference_from_pointer<Other, OtherRef>,
395 boost::bind(instance_ref, _1)
401 template<typename T1, typename T2, class Derived>
402 StyleSetterFuncUnchecked
403 bindStyleSetter( const std::string& name,
404 const boost::function<void (Derived&, T2)>& setter )
409 // We will only call setters with Derived instances, so we can safely
411 boost::bind(&derived_cast<Derived>, _1),
412 boost::bind(&getValue<T1>, _2)
416 virtual void childAdded(SGPropertyNode * child) {}
417 virtual void childRemoved(SGPropertyNode * child){}
418 virtual void childChanged(SGPropertyNode * child){}
420 void setDrawable(osg::Drawable* drawable);
423 * Get stateset of drawable if available or use transform otherwise
425 osg::StateSet* getOrCreateStateSet();
431 osg::ref_ptr<osg::Drawable> _drawable;
433 Element(const Element&);// = delete
435 template<class Derived>
436 static Derived& derived_cast(Element& el)
438 return static_cast<Derived&>(el);
441 template<class T, class SharedPtr>
442 static T& reference_from_pointer(const SharedPtr& p)
444 return *get_pointer(p);
448 * Helper to call a function only of the element type can be converted to
451 * @return Whether the function has been called
453 template<class Derived>
456 static bool call( Element& el,
457 const SGPropertyNode* prop,
458 const StyleSetterFuncUnchecked& func )
460 Derived* d = dynamic_cast<Derived*>(&el);
469 } // namespace canvas
470 } // namespace simgear
472 #endif /* CANVAS_ELEMENT_HXX_ */