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Add ability to register singletons from engine API

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* Exposed functions in Engine to register and unregister singletons.
* Added the concept of user singletons, which can be removed (the system ones can't).
This commit is contained in:
reduz
2021-08-24 19:03:10 -03:00
parent ca7f53dd25
commit e2f8df8c5b
5 changed files with 90 additions and 11 deletions
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30
core/config/engine.cpp
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@@ -199,17 +199,41 @@ bool Engine::is_printing_error_messages() const {
}
void Engine::add_singleton(const Singleton &p_singleton) {
ERR_FAIL_COND_MSG(singleton_ptrs.has(p_singleton.name), "Can't register singleton that already exists: " + String(p_singleton.name));
singletons.push_back(p_singleton);
singleton_ptrs[p_singleton.name] = p_singleton.ptr;
}
Object *Engine::get_singleton_object(const String &p_name) const {
Object *Engine::get_singleton_object(const StringName &p_name) const {
const Map<StringName, Object *>::Element *E = singleton_ptrs.find(p_name);
ERR_FAIL_COND_V_MSG(!E, nullptr, "Failed to retrieve non-existent singleton '" + p_name + "'.");
ERR_FAIL_COND_V_MSG(!E, nullptr, "Failed to retrieve non-existent singleton '" + String(p_name) + "'.");
return E->get();
}
bool Engine::has_singleton(const String &p_name) const {
bool Engine::is_singleton_user_created(const StringName &p_name) const {
ERR_FAIL_COND_V(!singleton_ptrs.has(p_name), false);
for (const Singleton &E : singletons) {
if (E.name == p_name && E.user_created) {
return true;
}
}
return false;
}
void Engine::remove_singleton(const StringName &p_name) {
ERR_FAIL_COND(!singleton_ptrs.has(p_name));
for (List<Singleton>::Element *E = singletons.front(); E; E = E->next()) {
if (E->get().name == p_name) {
singletons.erase(E);
singleton_ptrs.erase(p_name);
return;
}
}
}
bool Engine::has_singleton(const StringName &p_name) const {
return singleton_ptrs.has(p_name);
}