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e2f32b8f9d
Instead of everyone overriding save_to() and set_property() and doing a pretty asymmetric job of implementing the various properties, let's add a bit of structure here. Object properties are now represented by a Core::Property. Properties are registered with a getter and setter (optional) in constructors. I've added some convenience macros for creating and registering properties, but this does still feel a bit bulky. We'll have to iterate on this and see where it goes.
286 lines
12 KiB
C++
286 lines
12 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <AK/HashMap.h>
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#include <AK/IntrusiveList.h>
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#include <AK/Noncopyable.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/String.h>
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#include <AK/TypeCasts.h>
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#include <AK/Weakable.h>
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#include <LibCore/Forward.h>
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#include <LibCore/Property.h>
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namespace Core {
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class RPCClient;
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enum class TimerShouldFireWhenNotVisible {
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No = 0,
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Yes
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};
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#define C_OBJECT(klass) \
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public: \
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virtual const char* class_name() const override { return #klass; } \
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template<class... Args> \
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static inline NonnullRefPtr<klass> construct(Args&&... args) \
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{ \
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return adopt(*new klass(forward<Args>(args)...)); \
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}
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#define C_OBJECT_ABSTRACT(klass) \
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public: \
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virtual const char* class_name() const override { return #klass; }
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class Object
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: public RefCounted<Object>
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, public Weakable<Object> {
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// NOTE: No C_OBJECT macro for Core::Object itself.
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AK_MAKE_NONCOPYABLE(Object);
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AK_MAKE_NONMOVABLE(Object);
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public:
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IntrusiveListNode m_all_objects_list_node;
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virtual ~Object();
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virtual const char* class_name() const = 0;
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virtual void event(Core::Event&);
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const String& name() const { return m_name; }
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void set_name(const StringView& name) { m_name = name; }
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NonnullRefPtrVector<Object>& children() { return m_children; }
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const NonnullRefPtrVector<Object>& children() const { return m_children; }
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template<typename Callback>
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void for_each_child(Callback callback)
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{
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for (auto& child : m_children) {
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if (callback(child) == IterationDecision::Break)
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return;
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}
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}
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template<typename T, typename Callback>
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void for_each_child_of_type(Callback callback);
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bool is_ancestor_of(const Object&) const;
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Object* parent() { return m_parent; }
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const Object* parent() const { return m_parent; }
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void start_timer(int ms, TimerShouldFireWhenNotVisible = TimerShouldFireWhenNotVisible::No);
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void stop_timer();
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bool has_timer() const { return m_timer_id; }
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void add_child(Object&);
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void insert_child_before(Object& new_child, Object& before_child);
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void remove_child(Object&);
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void dump_tree(int indent = 0);
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void deferred_invoke(Function<void(Object&)>);
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bool is_widget() const { return m_widget; }
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virtual bool is_action() const { return false; }
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virtual bool is_window() const { return false; }
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void save_to(AK::JsonObject&);
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bool set_property(const StringView& name, const JsonValue& value);
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JsonValue property(const StringView& name);
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static IntrusiveList<Object, &Object::m_all_objects_list_node>& all_objects();
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void dispatch_event(Core::Event&, Object* stay_within = nullptr);
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void remove_from_parent()
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{
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if (m_parent)
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m_parent->remove_child(*this);
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}
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template<class T, class... Args>
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inline T& add(Args&&... args)
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{
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auto child = T::construct(forward<Args>(args)...);
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add_child(*child);
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return child;
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}
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virtual bool is_visible_for_timer_purposes() const;
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bool is_being_inspected() const { return m_inspector_count; }
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void increment_inspector_count(Badge<RPCClient>);
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void decrement_inspector_count(Badge<RPCClient>);
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protected:
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explicit Object(Object* parent = nullptr, bool is_widget = false);
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void register_property(const String& name, Function<JsonValue()> getter, Function<bool(const JsonValue&)> setter = nullptr);
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virtual void timer_event(TimerEvent&);
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virtual void custom_event(CustomEvent&);
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// NOTE: You may get child events for children that are not yet fully constructed!
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virtual void child_event(ChildEvent&);
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virtual void did_begin_inspection() { }
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virtual void did_end_inspection() { }
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private:
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Object* m_parent { nullptr };
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String m_name;
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int m_timer_id { 0 };
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unsigned m_inspector_count { 0 };
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bool m_widget { false };
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HashMap<String, NonnullOwnPtr<Property>> m_properties;
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NonnullRefPtrVector<Object> m_children;
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};
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}
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namespace Core {
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template<typename T, typename Callback>
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inline void Object::for_each_child_of_type(Callback callback)
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{
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for_each_child([&](auto& child) {
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if (is<T>(child))
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return callback(downcast<T>(child));
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return IterationDecision::Continue;
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});
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}
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const LogStream& operator<<(const LogStream&, const Object&);
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#define REGISTER_INT_PROPERTY(property_name, getter, setter) \
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register_property( \
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property_name, \
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[this] { return this->getter(); }, \
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[this](auto& value) { \
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this->setter(value.template to_number<int>()); \
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return true; \
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});
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#define REGISTER_BOOL_PROPERTY(property_name, getter, setter) \
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register_property( \
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property_name, \
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[this] { return this->getter(); }, \
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[this](auto& value) { \
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this->setter(value.to_bool()); \
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return true; \
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});
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#define REGISTER_STRING_PROPERTY(property_name, getter, setter) \
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register_property( \
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property_name, \
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[this] { return this->getter(); }, \
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[this](auto& value) { \
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this->setter(value.to_string()); \
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return true; \
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});
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#define REGISTER_READONLY_STRING_PROPERTY(property_name, getter) \
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register_property( \
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property_name, \
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[this] { return this->getter(); }, \
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nullptr);
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#define REGISTER_RECT_PROPERTY(property_name, getter, setter) \
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register_property( \
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property_name, \
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[this] { \
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auto rect = this->getter(); \
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JsonObject rect_object; \
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rect_object.set("x", rect.x()); \
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rect_object.set("y", rect.y()); \
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rect_object.set("width", rect.width()); \
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rect_object.set("height", rect.height()); \
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return rect_object; \
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}, \
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[this](auto& value) { \
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if (!value.is_object()) \
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return false; \
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Gfx::IntRect rect; \
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rect.set_x(value.as_object().get("x").to_i32()); \
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rect.set_y(value.as_object().get("y").to_i32()); \
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rect.set_width(value.as_object().get("width").to_i32()); \
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rect.set_height(value.as_object().get("height").to_i32()); \
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setter(rect); \
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return true; \
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});
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#define REGISTER_SIZE_PROPERTY(property_name, getter, setter) \
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register_property( \
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property_name, \
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[this] { \
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auto size = this->getter(); \
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JsonObject size_object; \
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size_object.set("width", size.width()); \
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size_object.set("height", size.height()); \
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return size_object; \
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}, \
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[this](auto& value) { \
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if (!value.is_object()) \
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return false; \
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Gfx::IntSize size; \
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size.set_width(value.as_object().get("width").to_i32()); \
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size.set_height(value.as_object().get("height").to_i32()); \
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setter(size); \
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return true; \
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});
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#define REGISTER_SIZE_POLICY_PROPERTY(property_name, getter, setter) \
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register_property( \
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property_name, [this]() -> JsonValue { \
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auto policy = this->getter(); \
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if (policy == GUI::SizePolicy::Fill) \
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return "Fill"; \
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if (policy == GUI::SizePolicy::Fixed) \
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return "Fixed"; \
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return JsonValue(); }, \
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[this](auto& value) { \
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if (!value.is_string()) \
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return false; \
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if (value.as_string() == "Fill") { \
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setter(GUI::SizePolicy::Fill); \
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return true; \
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} \
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if (value.as_string() == "Fixed") { \
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setter(GUI::SizePolicy::Fixed); \
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return true; \
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} \
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return false; \
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});
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}
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