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LibCore: Add typed find_child and find_descendant helpers to Object

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These look a lot like the parallel functionality in GUI::Widget :).
These use dynamic_cast now, to make use of that RTTI we just added.
This commit is contained in:
Andrew Kaster 2021-01-01 00:46:51 -07:00 • committed by Andreas Kling
parent 350d4d3543
commit 5b03a0867f
1 changed files with 41 additions and 4 deletions
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45
Libraries/LibCore/Object.h
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@ -91,7 +91,13 @@ public:
} }
template<typename T, typename Callback> template<typename T, typename Callback>
void for_each_child_of_type(Callback callback); void for_each_child_of_type(Callback callback) requires IsBaseOf<Object, T>::value;
template<typename T>
T* find_child_of_type_named(const String&) requires IsBaseOf<Object, T>::value;
template<typename T>
T* find_descendant_of_type_named(const String&) requires IsBaseOf<Object, T>::value;
bool is_ancestor_of(const Object&) const; bool is_ancestor_of(const Object&) const;
@ -181,15 +187,46 @@ struct Formatter<Core::Object> : Formatter<StringView> {
namespace Core { namespace Core {
template<typename T, typename Callback> template<typename T, typename Callback>
inline void Object::for_each_child_of_type(Callback callback) inline void Object::for_each_child_of_type(Callback callback) requires IsBaseOf<Object, T>::value
{ {
for_each_child([&](auto& child) { for_each_child([&](auto& child) {
if (is<T>(child)) if (auto* child_as_t = dynamic_cast<T*>(&child); child_as_t)
return callback(downcast<T>(child)); return callback(*child_as_t);
return IterationDecision::Continue; return IterationDecision::Continue;
}); });
} }
template<typename T>
T* Object::find_child_of_type_named(const String& name) requires IsBaseOf<Object, T>::value
{
T* found_child = nullptr;
for_each_child_of_type<T>([&](auto& child) {
if (child.name() == name) {
found_child = &child;
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
return found_child;
}
template<typename T>
T* Object::find_descendant_of_type_named(const String& name) requires IsBaseOf<Object, T>::value
{
auto* this_as_t = dynamic_cast<T*>(this);
if (this_as_t && this->name() == name)
return this_as_t;
T* found_child = nullptr;
for_each_child([&](auto& child) {
found_child = child.template find_descendant_of_type_named<T>(name);
if (found_child)
return IterationDecision::Break;
return IterationDecision::Continue;
});
return found_child;
}
const LogStream& operator<<(const LogStream&, const Object&); const LogStream& operator<<(const LogStream&, const Object&);
#define REGISTER_INT_PROPERTY(property_name, getter, setter) \ #define REGISTER_INT_PROPERTY(property_name, getter, setter) \