398 lines
13 KiB
C++
398 lines
13 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSG_CALLBACK
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#define OSG_CALLBACK 1
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#include <osg/Object>
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#include <osg/UserDataContainer>
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// forward declare
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namespace osgGA { class EventHandler; }
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namespace osg {
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// forward declare
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class CallbackObject;
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class NodeCallback;
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class StateAttributeCallback;
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class UniformCallback;
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class DrawableUpdateCallback;
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class DrawableEventCallback;
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class DrawableCullCallback;
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class OSG_EXPORT Callback : public virtual Object {
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public :
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Callback(){}
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Callback(const Callback& cb,const CopyOp& copyop):
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osg::Object(cb, copyop),
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_nestedCallback(cb._nestedCallback) {}
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META_Object(osg, Callback);
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virtual Callback* asCallback() { return this; }
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virtual const Callback* asCallback() const { return this; }
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virtual CallbackObject* asCallbackObject() { return 0; }
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virtual const CallbackObject* asCallbackObject() const { return 0; }
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virtual NodeCallback* asNodeCallback() { return 0; }
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virtual const NodeCallback* asNodeCallback() const { return 0; }
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virtual StateAttributeCallback* asStateAttributeCallback() { return 0; }
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virtual const StateAttributeCallback* asStateAttributeCallback() const { return 0; }
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virtual UniformCallback* asUniformCallback() { return 0; }
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virtual const UniformCallback* asUniformCallback() const { return 0; }
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virtual DrawableUpdateCallback* asDrawableUpdateCallback() { return 0; }
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virtual const DrawableUpdateCallback* asDrawableUpdateCallback() const { return 0; }
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virtual DrawableEventCallback* asDrawableEventCallback() { return 0; }
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virtual const DrawableEventCallback* asDrawableEventCallback() const { return 0; }
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virtual DrawableCullCallback* asDrawableCullCallback() { return 0; }
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virtual const DrawableCullCallback* asDrawableCullCallback() const { return 0; }
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virtual osgGA::EventHandler* asEventHandler() { return 0; }
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virtual const osgGA::EventHandler* asEventHandler() const { return 0; }
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/** Invoke the callback, first parameter is the Object that the callback is attached to,
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* the second parameter, the data, is typically the NodeVisitor that is invoking the callback.
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* The run(..) method may be overridden by users directly, or if the user is using one of the old
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* style callbacks such as NodeCallback or Drawable::UpdateCallback then you can just override
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* the appropriate callback method on those callback subclasses.
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* If you are implementing your own callback then one should call traverse() to make sure nested callbacks
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* and visitor traversal() is completed. */
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virtual bool run(osg::Object* object, osg::Object* data)
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{
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return traverse(object, data);
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}
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/** traverse the nested callbacks or call NodeVisitor::traverse() if the object is Node, and data is NodeVisitor.*/
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bool traverse(osg::Object* object, osg::Object* data);
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void setNestedCallback(osg::Callback* cb) { _nestedCallback = cb; }
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osg::Callback* getNestedCallback() { return _nestedCallback.get(); }
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const osg::Callback* getNestedCallback() const { return _nestedCallback.get(); }
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inline void addNestedCallback(osg::Callback* nc)
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{
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if (nc)
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{
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if (_nestedCallback.valid())
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{
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_nestedCallback->addNestedCallback(nc);
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}
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else
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{
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_nestedCallback = nc;
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}
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}
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}
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inline void removeNestedCallback(osg::Callback* nc)
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{
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if (nc)
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{
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if (_nestedCallback==nc)
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{
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ref_ptr<osg::Callback> new_nested_callback = _nestedCallback->getNestedCallback();
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_nestedCallback->setNestedCallback(0);
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_nestedCallback = new_nested_callback;
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}
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else if (_nestedCallback.valid())
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{
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_nestedCallback->removeNestedCallback(nc);
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}
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}
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}
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/** Convenience method to find a nested callback by type. */
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template <typename T>
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static T* findNestedCallback(osg::Callback* callback)
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{
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if (!callback)
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return NULL;
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if (T* cb = dynamic_cast<T*>(callback))
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return cb;
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return findNestedCallback<T>(callback->getNestedCallback());
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}
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/** Convenience method to find a nested callback by type. */
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template <typename T>
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static const T* findNestedCallback(const osg::Callback* callback)
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{
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if (!callback)
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return NULL;
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if (const T* cb = dynamic_cast<const T*>(callback))
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return cb;
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return findNestedCallback<T>(callback->getNestedCallback());
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}
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protected:
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virtual ~Callback() {}
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ref_ptr<Callback> _nestedCallback;
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};
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typedef std::vector< osg::ref_ptr<osg::Object> > Parameters;
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/** Callback for attaching a script to a Node's via there UserDataContainer for the purpose of overriding class methods within scripts.*/
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class OSG_EXPORT CallbackObject : public virtual osg::Callback
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{
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public:
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CallbackObject() {}
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CallbackObject(const std::string& name) { setName(name); }
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CallbackObject(const CallbackObject& co, const osg::CopyOp copyop=osg::CopyOp::SHALLOW_COPY):
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osg::Object(co, copyop),
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osg::Callback(co,copyop) {}
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META_Object(osg, CallbackObject);
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virtual CallbackObject* asCallbackObject() { return this; }
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virtual const CallbackObject* asCallbackObject() const { return this; }
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/** override Callback::run() entry point to adapt to CallbackObject::run(..) method.*/
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bool run(osg::Object* object, osg::Object* data);
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inline bool run(osg::Object* object) const
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{
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osg::Parameters inputParameters;
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osg::Parameters outputParameters;
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return run(object, inputParameters, outputParameters);
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}
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virtual bool run(osg::Object* object, osg::Parameters& inputParameters, osg::Parameters& outputParameters) const;
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};
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/** Convenience function for getting the CallbackObject associated with specified name from an Object's UserDataContainer.*/
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inline CallbackObject* getCallbackObject(osg::Object* object, const std::string& name)
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{
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osg::UserDataContainer* udc = object->getUserDataContainer();
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if (!udc) return 0;
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osg::Object* obj = udc->getUserObject(name);
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if (!obj) return 0;
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return obj->asCallbackObject();
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}
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/** Convenience function for getting the CallbackObject associated with specified name from an Object's UserDataContainer.*/
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inline const CallbackObject* getCallbackObject(const osg::Object* object, const std::string& name)
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{
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const osg::UserDataContainer* udc = object->getUserDataContainer();
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if (!udc) return 0;
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const osg::Object* obj = udc->getUserObject(name);
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if (!obj) return 0;
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return obj->asCallbackObject();
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}
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/** Call run(..) on named CallbackObjects attached to specified Object. Return true if at least one CallbackObject has been successfully invoked.*/
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inline bool runNamedCallbackObjects(osg::Object* object, const std::string& name, osg::Parameters& inputParameters, osg::Parameters& outputParameters)
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{
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bool result = false;
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osg::UserDataContainer* udc = object->getUserDataContainer();
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if (udc)
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{
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for(unsigned int i = 0; i<udc->getNumUserObjects(); ++i)
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{
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osg::Object* obj = udc->getUserObject(i);
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if (obj && obj->getName()==name)
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{
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osg::CallbackObject* co = obj->asCallbackObject();
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if (co) result = co->run(object, inputParameters, outputParameters) | result;
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}
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}
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}
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return result;
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}
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// forward declare
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class Node;
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class NodeVisitor;
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/** Deprecated. */
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class OSG_EXPORT NodeCallback : public virtual Callback {
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public :
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NodeCallback(){}
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NodeCallback(const NodeCallback& nc,const CopyOp& copyop):
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Object(nc, copyop),
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Callback(nc, copyop) {}
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META_Object(osg,NodeCallback);
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virtual NodeCallback* asNodeCallback() { return this; }
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virtual const NodeCallback* asNodeCallback() const { return this; }
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/** NodeCallback overrides the Callback::run() method to adapt it the old style NodeCallback::operator()(Node* node, NodeVisitor* nv) method.*/
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virtual bool run(osg::Object* object, osg::Object* data);
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/** Callback method called by the NodeVisitor when visiting a node.*/
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virtual void operator()(Node* node, NodeVisitor* nv);
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protected:
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virtual ~NodeCallback() {}
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};
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// forward declare
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class StateAttribute;
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/** Deprecated. */
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class OSG_EXPORT StateAttributeCallback : public virtual osg::Callback
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{
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public:
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StateAttributeCallback() {}
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StateAttributeCallback(const StateAttributeCallback& org,const CopyOp& copyop) :
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Object(org, copyop),
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Callback(org, copyop) {}
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META_Object(osg,StateAttributeCallback);
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virtual StateAttributeCallback* asStateAttributeCallback() { return this; }
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virtual const StateAttributeCallback* asStateAttributeCallback() const { return this; }
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/** override Callback::run() entry point to adapt to StateAttributeCallback::run(..) method.*/
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virtual bool run(osg::Object* object, osg::Object* data);
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/** do customized update code.*/
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virtual void operator () (StateAttribute*, NodeVisitor*) {}
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};
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// forward declare
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class UniformBase;
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class Uniform;
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/** Deprecated. */
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class OSG_EXPORT UniformCallback : public virtual osg::Callback
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{
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public:
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UniformCallback() {}
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UniformCallback(const UniformCallback& org, const CopyOp& copyop) :
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Object(org, copyop),
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Callback(org, copyop) {}
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META_Object(osg, UniformCallback);
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virtual UniformCallback* asUniformCallback() { return this; }
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virtual const UniformCallback* asUniformCallback() const { return this; }
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/** override Callback::run() entry point to adapt to UniformCallback::run(..) method.*/
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virtual bool run(osg::Object* object, osg::Object* data);
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/** do customized update code.*/
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virtual void operator () (UniformBase* ub, NodeVisitor* nv);
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virtual void operator () (Uniform*, NodeVisitor*) {}
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};
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// forward declare
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class Drawable;
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class State;
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class RenderInfo;
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class OSG_EXPORT DrawableUpdateCallback : public virtual Callback
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{
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public:
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DrawableUpdateCallback() {}
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DrawableUpdateCallback(const DrawableUpdateCallback& org,const CopyOp& copyop):
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Object(org, copyop),
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Callback(org, copyop) {}
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META_Object(osg,DrawableUpdateCallback);
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virtual DrawableUpdateCallback* asDrawableUpdateCallback() { return this; }
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virtual const DrawableUpdateCallback* asDrawableUpdateCallback() const { return this; }
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/** override Callback::run() entry point to adapt to StateAttributeCallback::run(..) method.*/
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virtual bool run(osg::Object* object, osg::Object* data);
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/** do customized update code.*/
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virtual void update(osg::NodeVisitor*, osg::Drawable*) {}
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};
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class OSG_EXPORT DrawableEventCallback : public virtual Callback
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{
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public:
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DrawableEventCallback() {}
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DrawableEventCallback(const DrawableEventCallback& org, const CopyOp& copyop) :
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Object(org, copyop),
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Callback(org, copyop) {}
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META_Object(osg,DrawableEventCallback);
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virtual DrawableEventCallback* asDrawableEventCallback() { return this; }
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virtual const DrawableEventCallback* asDrawableEventCallback() const { return this; }
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/** override Callback::run() entry point to adapt to StateAttributeCallback::run(..) method.*/
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virtual bool run(osg::Object* object, osg::Object* data);
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/** do customized Event code. */
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virtual void event(osg::NodeVisitor*, osg::Drawable*) {}
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};
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class OSG_EXPORT DrawableCullCallback : public virtual Callback
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{
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public:
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DrawableCullCallback() {}
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DrawableCullCallback(const DrawableCullCallback& org, const CopyOp& copyop) :
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Object(org, copyop),
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Callback(org, copyop) {}
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META_Object(osg,DrawableCullCallback);
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virtual DrawableCullCallback* asDrawableCullCallback() { return this; }
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virtual const DrawableCullCallback* asDrawableCullCallback() const { return this; }
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// just use the standard run implementation to passes run onto any nested callbacks.
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using Callback::run;
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/** deprecated.*/
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virtual bool cull(osg::NodeVisitor*, osg::Drawable*, osg::State*) const { return false; }
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/** do customized cull code, return true if drawable should be culled.*/
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virtual bool cull(osg::NodeVisitor* nv, osg::Drawable* drawable, osg::RenderInfo* renderInfo) const;
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};
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} // namespace
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#endif
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