Differential D3892 Diff 17237 source/gui/CGUISetting.h

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source/gui/CGUISetting.h

	/* Copyright (C) 2019 Wildfire Games.			/* Copyright (C) 2021 Wildfire Games.
	* This file is part of 0 A.D.			* This file is part of 0 A.D.
	*			*
	* 0 A.D. is free software: you can redistribute it and/or modify			* 0 A.D. is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by			* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 2 of the License, or			* the Free Software Foundation, either version 2 of the License, or
	* (at your option) any later version.			* (at your option) any later version.
	*			*
	* 0 A.D. is distributed in the hope that it will be useful,			* 0 A.D. is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of			* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.			* GNU General Public License for more details.
	*			*
	* You should have received a copy of the GNU General Public License			* You should have received a copy of the GNU General Public License
	* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.			* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
	*/			*/

	#ifndef INCLUDED_CGUISETTINGS			#ifndef INCLUDED_CGUISETTINGS
	#define INCLUDED_CGUISETTINGS			#define INCLUDED_CGUISETTINGS

	#include "gui/ObjectBases/IGUIObject.h"			#include "gui/ObjectBases/IGUIObject.h"

				class IGUIObject;
				class ScriptRequest;

	/**			/**
	* This setting interface allows GUI objects to call setting function functions without having to know the setting type.			* This setting interface allows GUI objects to call setting function functions without having to know the setting type.
	* This is fact is used for setting the value from a JS value or XML value (string) and when deleting the setting,			* This is fact is used for setting the value from a JS value or XML value (string) and when deleting the setting,
	* when the type of the setting value is not known in advance.			* when the type of the setting value is not known in advance.
	*/			*/
	class IGUISetting			class IGUISetting
	{			{
	public:			public:
	NONCOPYABLE(IGUISetting);			NONCOPYABLE(IGUISetting);
				IGUISetting(const CStr& name, IGUIObject* owner);
	IGUISetting() = default;
	virtual ~IGUISetting() = default;

	/**			/**
	* Parses the given string and assigns to the setting value. Used for parsing XML attributes.			* Parses the given string and assigns to the setting value. Used for parsing XML attributes.
	*/			*/
	virtual bool FromString(const CStrW& Value, const bool SendMessage) = 0;			bool FromString(const CStrW& value, const bool sendMessage);

	/**			/**
	* Parses the given JS::Value using ScriptInterface::FromJSVal and assigns it to the setting data.			* Parses the given JS::Value using ScriptInterface::FromJSVal and assigns it to the setting data.
	*/			*/
	virtual bool FromJSVal(const ScriptRequest& rq, JS::HandleValue Value, const bool SendMessage) = 0;			bool FromJSVal(const ScriptRequest& rq, JS::HandleValue value, const bool sendMessage);

	/**			/**
	* Converts the setting data to a JS::Value using ScriptInterface::ToJSVal.			* Converts the setting data to a JS::Value using ScriptInterface::ToJSVal.
	*/			*/
	virtual void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue Value) = 0;			virtual void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue value) = 0;
	};

	template<typename T>			protected:
	class CGUISetting : public IGUISetting			IGUISetting(IGUISetting&& o);
	{			virtual ~IGUISetting() = default;
	public:
	NONCOPYABLE(CGUISetting);

	CGUISetting(IGUIObject& pObject, const CStr& Name, T& Value);			virtual bool DoFromString(const CStrW& value) = 0;
				virtual bool DoFromJSVal(const ScriptRequest& rq, JS::HandleValue value) = 0;

	/**			/**
	* Parses the given string and assigns to the setting value. Used for parsing XML attributes.			* Triggers the IGUIObject logic when a setting changes.
				* This must be called by derived classes when something externally visible changes.
	*/			*/
	bool FromString(const CStrW& Value, const bool SendMessage) override;			void OnSettingChange(const CStr& setting, bool sendMessage);

	/**			/**
	* Parses the given JS::Value using ScriptInterface::FromJSVal and assigns it to the setting data.			* Return the name of the setting, from JS.
	*/			*/
	bool FromJSVal(const ScriptRequest& rq, JS::HandleValue Value, const bool SendMessage) override;			virtual CStr GetName() const = 0;

	/**			/**
	* Converts the setting data to a JS::Value using ScriptInterface::ToJSVal.			* The object that stores this setting.
	*/			*/
	void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue Value) override;			IGUIObject& m_pObject;
				};

	/**			/**
	* These members are public because they are either unmodifiable or free to be modified.			* Wraps a T. Makes sure the appropriate setting functions are called when modifying T,
	* In particular it avoids the need for setter templates specialized depending on copiability.			* and likewise makes sure that JS/xml settings affect T appropriately,
				* while being as transparent as possible to use from C++ code.
	*/			*/
				template<typename T>
				class CGUISimpleSetting : public IGUISetting
				{
				public:
				template<typename... Args>
				CGUISimpleSetting(IGUIObject* pObject, const CStr& Name, Args&&... args)
				: IGUISetting(Name, pObject), m_Name(Name), m_Setting(args...)
				{}
				NONCOPYABLE(CGUISimpleSetting);
				MOVABLE(CGUISimpleSetting);

	/**			operator T&() { return m_Setting; }
	* The object that stores this setting.			operator const T&() const { return m_Setting; }
	*/
	IGUIObject& m_pObject;			T* operator->() { return &m_Setting; }
				const T* operator->() const { return &m_Setting; }

	/**			/**
	* Property name identifying the setting.			* Explicit getter for when that's more convenient than a cast.
	*/			*/
	const CStr m_Name;			T& Get() { return m_Setting; }
				const T& Get() const { return m_Setting; }

	/**			/**
	* Holds a reference to the value of the setting.			* 'Uglified' operator=, so that SendMessage is explicit.
	* The setting value is stored in the member class to optimize for draw calls of that class.
	*/			*/
	T& m_pSetting;			void Set(T value, bool sendMessage)
				{
				m_Setting = std::move(value);
				OnSettingChange(m_Name, sendMessage);
				}

				protected:
				virtual CStr GetName() const override
				{
				return m_Name;
				}

				virtual bool DoFromString(const CStrW& value) override;
				virtual bool DoFromJSVal(const ScriptRequest& rq, JS::HandleValue value) override;
				virtual void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue value) override;

				const CStr m_Name;
				T m_Setting;
	};			};

	#endif // INCLUDED_CGUISETTINGS			#endif // INCLUDED_CGUISETTINGS