e858bbdcf5
Instead of replicating the RGSS Disposable interface in C++ and merely binding it, redefine the 'disposed' state as the entire core object being deleted (and the binding object's private pointer being null). This makes the behavior more accurate in regard to RMXP. It is now for example possible to subclass disposable classes and access their 'dispose'/'disposed?' methods without initializing the base class first (because the internal pointer is simply null before initialization). Accessing any other base methods will still raise an exception. There are some quirks and irregular behavior in RMXP; eg. most nullable bitmap attributes of disposable classes (Sprite, Plane etc.) can still be queried afterwards, but some cannot (Tilemap#tileset), and disposing certain attributes crashes RMXP entirely (Tilemap#autotiles[n]). mkxp tries to behave as close possible, but will be more lenient some circumstances. To the core, disposed bitmap attributes will look identically to null, which slightly diverges from RMXP (where they're treated as still existing, but aren't drawn). The Disposable interface has been retained containing a single signal, for the binding to inform core when objects are disposed (so active attributes can be set to null).
101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
/*
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** disposable-binding.h
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**
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** This file is part of mkxp.
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**
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** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
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**
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** mkxp is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 2 of the License, or
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** (at your option) any later version.
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**
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** mkxp 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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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with mkxp. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DISPOSABLEBINDING_H
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#define DISPOSABLEBINDING_H
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#include "disposable.h"
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#include "binding-util.h"
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#include "mruby/array.h"
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#include <string.h>
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/* 'Children' are disposables that are disposed together
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* with their parent. Currently this is only used by Viewport
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* in RGSS1.
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* FIXME: Disable this behavior when RGSS2 or 3 */
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inline void
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disposableAddChild(mrb_state *mrb, mrb_value disp, mrb_value child)
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{
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mrb_sym sym = getMrbData(mrb)->symbols[CSchildren];
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mrb_value children = mrb_iv_get(mrb, disp, sym);
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if (mrb_nil_p(children))
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{
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children = mrb_ary_new(mrb);
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mrb_iv_set(mrb, disp, sym, children);
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}
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/* Assumes children are never removed until destruction */
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mrb_ary_push(mrb, children, child);
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}
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inline void
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disposableDisposeChildren(mrb_state *mrb, mrb_value disp)
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{
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MrbData *mrbData = getMrbData(mrb);
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mrb_value children = mrb_iv_get(mrb, disp, mrbData->symbols[CSchildren]);
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if (mrb_nil_p(children))
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return;
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for (mrb_int i = 0; i < RARRAY_LEN(children); ++i)
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mrb_funcall_argv(mrb, mrb_ary_entry(children, i),
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mrbData->symbols[CSdispose], 0, 0);
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}
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template<class C>
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MRB_METHOD(disposableDispose)
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{
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C *c = static_cast<C*>(DATA_PTR(self));
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/* Nothing to do if already disposed */
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if (!c)
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return mrb_nil_value();
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/* Inform core */
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c->wasDisposed();
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disposableDisposeChildren(mrb, self);
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delete c;
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DATA_PTR(self) = 0;
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return mrb_nil_value();
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}
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template<class C>
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MRB_METHOD(disposableDisposed)
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{
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MRB_UNUSED_PARAM;
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return mrb_bool_value(DATA_PTR(self) == 0);
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}
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template<class C>
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static void disposableBindingInit(mrb_state *mrb, RClass *klass)
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{
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mrb_define_method(mrb, klass, "dispose", disposableDispose<C>, MRB_ARGS_NONE());
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mrb_define_method(mrb, klass, "disposed?", disposableDisposed<C>, MRB_ARGS_NONE());
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}
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#endif // DISPOSABLEBINDING_H
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