117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file eventHandler.h
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* @author drose
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* @date 1999-02-08
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*/
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#ifndef EVENTHANDLER_H
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#define EVENTHANDLER_H
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#include "pandabase.h"
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#include "event.h"
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#include "pt_Event.h"
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#include "asyncFuture.h"
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#include "pset.h"
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#include "pmap.h"
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class EventQueue;
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/**
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* A class to monitor events from the C++ side of things. It maintains a set
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* of "hooks", function pointers assigned to event names, and calls the
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* appropriate hooks when the matching event is detected.
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*
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* This class is not necessary when the hooks are detected and processed
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* entirely by the scripting language, e.g. via Scheme hooks or the messenger
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* in Python.
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*/
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class EXPCL_PANDA_EVENT EventHandler : public TypedObject {
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public:
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// Define a function type suitable for receiving events.
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typedef void EventFunction(const Event *);
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typedef void EventCallbackFunction(const Event *, void *);
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PUBLISHED:
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explicit EventHandler(EventQueue *ev_queue);
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~EventHandler() {}
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AsyncFuture *get_future(const std::string &event_name);
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void process_events();
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virtual void dispatch_event(const Event *event);
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void write(std::ostream &out) const;
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INLINE static EventHandler *get_global_event_handler(EventQueue *queue = nullptr);
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public:
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bool add_hook(const std::string &event_name, EventFunction *function);
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bool add_hook(const std::string &event_name, EventCallbackFunction *function,
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void *data);
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bool has_hook(const std::string &event_name) const;
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bool has_hook(const std::string &event_name, EventFunction *function) const;
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bool has_hook(const std::string &event_name, EventCallbackFunction *function,
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void *data) const;
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bool remove_hook(const std::string &event_name, EventFunction *function);
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bool remove_hook(const std::string &event_name, EventCallbackFunction *function,
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void *data);
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bool remove_hooks(const std::string &event_name);
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bool remove_hooks_with(void *data);
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void remove_all_hooks();
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protected:
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typedef pset<EventFunction *> Functions;
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typedef pmap<std::string, Functions> Hooks;
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typedef std::pair<EventCallbackFunction*, void*> CallbackFunction;
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typedef pset<CallbackFunction> CallbackFunctions;
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typedef pmap<std::string, CallbackFunctions> CallbackHooks;
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typedef pmap<std::string, PT(AsyncFuture)> Futures;
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Hooks _hooks;
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CallbackHooks _cbhooks;
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Futures _futures;
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EventQueue &_queue;
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static EventHandler *_global_event_handler;
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static void make_global_event_handler();
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private:
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void write_hook(std::ostream &out, const Hooks::value_type &hook) const;
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void write_cbhook(std::ostream &out, const CallbackHooks::value_type &hook) const;
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public:
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static TypeHandle get_class_type() {
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return _type_handle;
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}
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static void init_type() {
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TypedObject::init_type();
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register_type(_type_handle, "EventHandler",
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TypedObject::get_class_type());
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}
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virtual TypeHandle get_type() const {
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return get_class_type();
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}
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virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
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private:
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static TypeHandle _type_handle;
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};
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#include "eventHandler.I"
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#endif
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