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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Badge.h>
#include <AK/Function.h>
#include <AK/IntrusiveList.h>
#include <AK/Noncopyable.h>
#include <AK/NonnullRefPtrVector.h>
#include <AK/StdLibExtras.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <AK/Weakable.h>
namespace AK {
class JsonObject;
}
enum class TimerShouldFireWhenNotVisible {
No = 0,
Yes
};
class CEvent;
class CEventLoop;
class CChildEvent;
class CCustomEvent;
class CTimerEvent;
#define C_OBJECT(klass) \
public: \
virtual const char* class_name() const override { return #klass; } \
template<class... Args> \
static inline NonnullRefPtr<klass> construct(Args&&... args) \
{ \
return adopt(*new klass(forward<Args>(args)...)); \
}
#define C_OBJECT_ABSTRACT(klass) \
public: \
virtual const char* class_name() const override { return #klass; }
class CObject
: public RefCounted<CObject>
, public Weakable<CObject> {
// NOTE: No C_OBJECT macro for CObject itself.
AK_MAKE_NONCOPYABLE(CObject)
AK_MAKE_NONMOVABLE(CObject)
public:
IntrusiveListNode m_all_objects_list_node;
virtual ~CObject();
virtual const char* class_name() const = 0;
virtual void event(CEvent&);
const String& name() const { return m_name; }
void set_name(const StringView& name) { m_name = name; }
NonnullRefPtrVector<CObject>& children() { return m_children; }
const NonnullRefPtrVector<CObject>& children() const { return m_children; }
template<typename Callback>
void for_each_child(Callback callback)
{
for (auto& child : m_children) {
if (callback(child) == IterationDecision::Break)
return;
}
}
template<typename T, typename Callback>
void for_each_child_of_type(Callback callback);
bool is_ancestor_of(const CObject&) const;
CObject* parent() { return m_parent; }
const CObject* parent() const { return m_parent; }
void start_timer(int ms, TimerShouldFireWhenNotVisible = TimerShouldFireWhenNotVisible::No);
void stop_timer();
bool has_timer() const { return m_timer_id; }
void add_child(CObject&);
void insert_child_before(CObject& new_child, CObject& before_child);
void remove_child(CObject&);
void dump_tree(int indent = 0);
void deferred_invoke(Function<void(CObject&)>);
bool is_widget() const { return m_widget; }
virtual bool is_window() const { return false; }
virtual void save_to(AK::JsonObject&);
static IntrusiveList<CObject, &CObject::m_all_objects_list_node>& all_objects();
void dispatch_event(CEvent&, CObject* stay_within = nullptr);
void remove_from_parent()
{
if (m_parent)
m_parent->remove_child(*this);
}
virtual bool is_visible_for_timer_purposes() const;
protected:
explicit CObject(CObject* parent = nullptr, bool is_widget = false);
virtual void timer_event(CTimerEvent&);
virtual void custom_event(CCustomEvent&);
// NOTE: You may get child events for children that are not yet fully constructed!
virtual void child_event(CChildEvent&);
private:
CObject* m_parent { nullptr };
String m_name;
int m_timer_id { 0 };
bool m_widget { false };
NonnullRefPtrVector<CObject> m_children;
};
template<typename T>
inline bool is(const CObject&) { return false; }
template<>
inline bool is<CObject>(const CObject&) { return true; }
template<typename T>
inline T& to(CObject& object)
{
ASSERT(is<typename RemoveConst<T>::Type>(object));
return static_cast<T&>(object);
}
template<typename T>
inline const T& to(const CObject& object)
{
ASSERT(is<typename RemoveConst<T>::Type>(object));
return static_cast<const T&>(object);
}
template<typename T, typename Callback>
inline void CObject::for_each_child_of_type(Callback callback)
{
for_each_child([&](auto& child) {
if (is<T>(child))
return callback(to<T>(child));
return IterationDecision::Continue;
});
}
inline const LogStream& operator<<(const LogStream& stream, const CObject& object)
{
return stream << object.class_name() << '{' << &object << '}';
}
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