83 lines
2.3 KiB
C
83 lines
2.3 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 writableConfigurable.h
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* @author jason
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* @date 2000-06-19
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*/
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#ifndef WRITABLECONFIGURABLE_H
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#define WRITABLECONFIGURABLE_H
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// Includes
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#include "pandabase.h"
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#include "typedWritable.h"
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// Defines
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/**
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* Defined as a fix to allow creating Configurable and Writable objects.
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* Otherwise the compiler gets confused since both TypedWritable and
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* Configurable inherit from TypedObject.
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*
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* An object that has data or parameters that are set less frequently (at
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* least occasionally) than every frame. We can cache the configuration info
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* by by using the "dirty" flag.
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*/
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class EXPCL_PANDA_PUTIL WritableConfigurable : public TypedWritable {
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public:
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WritableConfigurable( void ) { make_dirty(); }
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virtual void config( void ) { _dirty = false; }
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INLINE void check_config() const {
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if (_dirty) {
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// This is a sneaky trick to allow check_config() to be called from a
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// const member function. Even though we will be calling config(), a
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// non-const function that modifies the class object, in some sense it's
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// not really modifying the class object--it's just updating a few
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// internal settings for consistency.
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((WritableConfigurable *)this)->config();
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}
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}
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INLINE bool is_dirty() const { return _dirty; }
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INLINE void make_dirty() { _dirty = true; }
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private:
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bool _dirty;
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public:
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virtual void write_datagram(BamWriter*, Datagram&) = 0;
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PUBLISHED:
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static TypeHandle get_class_type() {
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return _type_handle;
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}
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public:
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static void init_type() {
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TypedWritable::init_type();
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register_type(_type_handle, "WritableConfigurable",
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TypedWritable::get_class_type());
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TypeRegistry::ptr()->record_alternate_name(_type_handle,
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"WriteableConfigurable");
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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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#endif
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