114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
// Filename: eventHandler.h
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// Created by: drose (08Feb99)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://www.panda3d.org/license.txt .
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//
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// To contact the maintainers of this program write to
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// panda3d@yahoogroups.com .
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//
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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 "pset.h"
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#include "pmap.h"
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class EventQueue;
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////////////////////////////////////////////////////////////////////
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// Class : EventHandler
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// Description : A class to monitor events from the C++ side of
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// things. It maintains a set of "hooks", function
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// pointers assigned to event names, and calls the
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// appropriate hooks when the matching event is
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// detected.
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//
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// This class is not necessary when the hooks are
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// detected and processed entirely by the scripting
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// 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_PANDAEXPRESS 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(CPT_Event);
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typedef void EventCallbackFunction(CPT_Event, void *);
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PUBLISHED:
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EventHandler(EventQueue *queue);
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void process_events();
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virtual void dispatch_event(const CPT_Event &event);
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void write(ostream &out) const;
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INLINE static EventHandler *get_global_event_handler(EventQueue *queue);
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public:
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bool add_hook(const string &event_name, EventFunction *function);
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bool add_hook(const string &event_name, EventCallbackFunction *function,
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void *data);
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bool has_hook(const string &event_name) const;
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bool remove_hook(const string &event_name, EventFunction *function);
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bool remove_hook(const string &event_name, EventCallbackFunction *function,
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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<string, Functions> Hooks;
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typedef pair<EventCallbackFunction*, void*> CallbackFunction;
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typedef pset<CallbackFunction> CallbackFunctions;
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typedef pmap<string, CallbackFunctions> CallbackHooks;
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Hooks _hooks;
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CallbackHooks _cbhooks;
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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(EventQueue *queue);
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private:
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void write_hook(ostream &out, const Hooks::value_type &hook) const;
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void write_cbhook(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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