1 ///@file 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
27 #include <osg/BoundingBox>
28 #include <osg/MatrixTransform>
30 #include <boost/bind.hpp>
31 #include <boost/function.hpp>
32 #include <boost/type_traits/is_base_of.hpp>
45 * Baseclass for Elements displayed inside a Canvas.
48 public PropertyBasedElement
53 * Store pointer to window as user data
56 public osg::Referenced
60 OSGUserData(ElementPtr element);
63 typedef boost::function<bool(Element&, const SGPropertyNode*)>
65 typedef boost::function<void(Element&, const SGPropertyNode*)>
66 StyleSetterFuncUnchecked;
71 SGSharedPtr<StyleSetter> next;
75 StyleSetter setter; ///< Function(s) for setting this style
76 std::string type; ///< Interpolation type
77 bool inheritable; ///< Whether children can inherit this style from
82 * Coordinate reference frame (eg. "clip" property)
86 GLOBAL, ///< Global coordinates
87 PARENT, ///< Coordinates relative to parent coordinate frame
88 LOCAL ///< Coordinates relative to local coordinates (parent
89 /// coordinates with local transformations applied)
95 virtual ~Element() = 0;
96 virtual void onDestroy();
98 ElementPtr getParent() const;
99 CanvasWeakPtr getCanvas() const;
102 * Called every frame to update internal state
104 * @param dt Frame time in seconds
106 virtual void update(double dt);
108 bool addEventListener(const std::string& type, const EventListener& cb);
109 virtual void clearEventListener();
111 virtual bool accept(EventVisitor& visitor);
112 virtual bool ascend(EventVisitor& visitor);
113 virtual bool traverse(EventVisitor& visitor);
115 virtual bool handleEvent(const EventPtr& event);
116 bool dispatchEvent(const EventPtr& event);
120 * @param global_pos Position in global (canvas) coordinate frame
121 * @param parent_pos Position in parent coordinate frame
122 * @param local_pos Position in local (element) coordinate frame
124 virtual bool hitBound( const osg::Vec2f& global_pos,
125 const osg::Vec2f& parent_pos,
126 const osg::Vec2f& local_pos ) const;
129 * Set visibility of the element.
131 void setVisible(bool visible);
134 * Get whether the element is visible or hidden.
136 bool isVisible() const;
138 osg::MatrixTransform* getMatrixTransform();
139 osg::MatrixTransform const* getMatrixTransform() const;
142 * Transform position to local coordinages.
144 osg::Vec2f posToLocal(const osg::Vec2f& pos) const;
146 virtual void childAdded( SGPropertyNode * parent,
147 SGPropertyNode * child );
148 virtual void childRemoved( SGPropertyNode * parent,
149 SGPropertyNode * child );
150 virtual void valueChanged(SGPropertyNode * child);
152 virtual bool setStyle( const SGPropertyNode* child,
153 const StyleInfo* style_info = 0 );
158 * @note Only "rect(<top>, <right>, <bottom>, <left>)" is supported
159 * @see http://www.w3.org/TR/CSS21/visufx.html#propdef-clip
161 void setClip(const std::string& clip);
164 * Clipping coordinates reference frame
166 void setClipFrame(ReferenceFrame rf);
169 * Get bounding box (may not be as tight as bounding box returned by
170 * #getTightBoundingBox)
172 osg::BoundingBox getBoundingBox() const;
175 * Get tight bounding box (child points are transformed to elements
176 * coordinate space before calculating the bounding box).
178 osg::BoundingBox getTightBoundingBox() const;
181 * Get bounding box with children/drawables transformed by passed matrix
183 virtual osg::BoundingBox getTransformedBounds(const osg::Matrix& m) const;
186 * Get the transformation matrix (product of all transforms)
188 osg::Matrix getMatrix() const;
191 * Create an canvas Element
193 * @tparam Derived Type of element (needs to derive from Element)
195 template<typename Derived>
197 typename boost::enable_if<
198 boost::is_base_of<Element, Derived>,
200 >::type create( const CanvasWeakPtr& canvas,
201 const SGPropertyNode_ptr& node,
202 const Style& style = Style(),
203 Element* parent = NULL )
205 return ElementPtr( new Derived(canvas, node, style, parent) );
213 BLEND_FUNC = TRANSFORM << 1,
214 LAST_ATTRIBUTE = BLEND_FUNC << 1
226 class RelativeScissor;
228 CanvasWeakPtr _canvas;
231 mutable uint32_t _attributes_dirty;
233 osg::observer_ptr<osg::MatrixTransform> _transform;
234 std::vector<TransformType> _transform_types;
237 RelativeScissor *_scissor;
239 typedef std::vector<EventListener> Listener;
240 typedef std::map<int, Listener> ListenerMap;
242 ListenerMap _listener;
244 typedef std::map<std::string, StyleInfo> StyleSetters;
245 static StyleSetters _style_setters;
247 static void staticInit();
249 Element( const CanvasWeakPtr& canvas,
250 const SGPropertyNode_ptr& node,
251 const Style& parent_style,
255 * Returns false on first call and true on any successive call. Use to
256 * perform initialization tasks which are only required once per element
259 * @tparam Derived (Derived) class type
261 template<class Derived>
264 static bool is_init = false;
273 * Register a function for setting a style specified by the given property
275 * @param name Property name
276 * @param type Interpolation type
277 * @param setter Setter function
279 * @tparam T1 Type of value used to retrieve value from property
281 * @tparam T2 Type of value the setter function expects
282 * @tparam Derived Type of class the setter can be applied to
284 * @note T1 needs to be convertible to T2
293 addStyle( const std::string& name,
294 const std::string& type,
295 const boost::function<void (Derived&, T2)>& setter,
296 bool inheritable = true )
298 StyleInfo& style_info = _style_setters[ name ];
301 if( !style_info.type.empty() && type != style_info.type )
306 "changing animation type for '" << name << "': "
307 << style_info.type << " -> " << type
310 style_info.type = type;
312 // TODO check if changed?
313 style_info.inheritable = inheritable;
315 StyleSetter* style = &style_info.setter;
319 style = style->next = new StyleSetter;
321 style->func = boost::bind
323 &type_match<Derived>::call,
326 bindStyleSetter<T1>(name, setter)
337 addStyle( const std::string& name,
338 const std::string& type,
339 const boost::function<void (Derived&, T)>& setter,
340 bool inheritable = true )
342 return addStyle<T, T>(name, type, setter, inheritable);
351 addStyle( const std::string& name,
352 const std::string& type,
353 void (Derived::*setter)(T),
354 bool inheritable = true )
356 return addStyle<T, T>
360 boost::function<void (Derived&, T)>(setter),
372 addStyle( const std::string& name,
373 const std::string& type,
374 void (Derived::*setter)(T2),
375 bool inheritable = true )
381 boost::function<void (Derived&, T2)>(setter),
391 addStyle( const std::string& name,
392 const std::string& type,
393 void (Derived::*setter)(const std::string&),
394 bool inheritable = true )
396 return addStyle<const char*, const std::string&>
400 boost::function<void (Derived&, const std::string&)>(setter),
413 addStyle( const std::string& name,
414 const std::string& type,
415 void (Other::*setter)(T),
416 OtherRef Derived::*instance_ref,
417 bool inheritable = true )
419 return addStyle<T, T>
423 bindOther(setter, instance_ref),
437 addStyle( const std::string& name,
438 const std::string& type,
439 void (Other::*setter)(T2),
440 OtherRef Derived::*instance_ref,
441 bool inheritable = true )
447 bindOther(setter, instance_ref),
461 addStyle( const std::string& name,
462 const std::string& type,
463 const boost::function<void (Other&, T2)>& setter,
464 OtherRef Derived::*instance_ref,
465 bool inheritable = true )
471 bindOther(setter, instance_ref),
483 addStyle( const std::string& name,
484 const std::string& type,
485 void (Other::*setter)(const std::string&),
486 OtherRef Derived::*instance_ref,
487 bool inheritable = true )
489 return addStyle<const char*, const std::string&>
493 boost::function<void (Other&, const std::string&)>(setter),
499 template<typename T, class Derived, class Other, class OtherRef>
501 boost::function<void (Derived&, T)>
502 bindOther( void (Other::*setter)(T), OtherRef Derived::*instance_ref )
504 return boost::bind(setter, boost::bind(instance_ref, _1), _2);
507 template<typename T, class Derived, class Other, class OtherRef>
509 boost::function<void (Derived&, T)>
510 bindOther( const boost::function<void (Other&, T)>& setter,
511 OtherRef Derived::*instance_ref )
518 &reference_from_pointer<Other, OtherRef>,
519 boost::bind(instance_ref, _1)
525 template<typename T1, typename T2, class Derived>
527 StyleSetterFuncUnchecked
528 bindStyleSetter( const std::string& name,
529 const boost::function<void (Derived&, T2)>& setter )
534 // We will only call setters with Derived instances, so we can safely
536 boost::bind(&derived_cast<Derived>, _1),
537 boost::bind(&getValue<T1>, _2)
541 bool isStyleEmpty(const SGPropertyNode* child) const;
542 bool canApplyStyle(const SGPropertyNode* child) const;
543 bool setStyleImpl( const SGPropertyNode* child,
544 const StyleInfo* style_info = 0 );
546 const StyleInfo* getStyleInfo(const std::string& name) const;
547 const StyleSetter* getStyleSetter(const std::string& name) const;
548 const SGPropertyNode* getParentStyle(const SGPropertyNode* child) const;
550 virtual void childAdded(SGPropertyNode * child) {}
551 virtual void childRemoved(SGPropertyNode * child){}
552 virtual void childChanged(SGPropertyNode * child){}
554 void setDrawable(osg::Drawable* drawable);
557 * Get stateset of drawable if available or use transform otherwise
559 osg::StateSet* getOrCreateStateSet();
565 osg::ref_ptr<osg::Drawable> _drawable;
567 Element(const Element&);// = delete
569 template<class Derived>
570 static Derived& derived_cast(Element& el)
572 return static_cast<Derived&>(el);
575 template<class T, class SharedPtr>
576 static T& reference_from_pointer(const SharedPtr& p)
578 return *get_pointer(p);
582 * Helper to call a function only of the element type can be converted to
585 * @return Whether the function has been called
587 template<class Derived>
590 static bool call( Element& el,
591 const SGPropertyNode* prop,
592 const StyleSetterFuncUnchecked& func )
594 Derived* d = dynamic_cast<Derived*>(&el);
603 } // namespace canvas
606 struct enum_traits<canvas::Element::ReferenceFrame>
608 static const char* name()
610 return "canvas::Element::ReferenceFrame";
613 static canvas::Element::ReferenceFrame defVal()
615 return canvas::Element::GLOBAL;
618 static bool validate(int frame)
620 return frame >= canvas::Element::GLOBAL
621 && frame <= canvas::Element::LOCAL;
625 } // namespace simgear
627 #endif /* CANVAS_ELEMENT_HXX_ */