// Copyright (c) 2016-2018 Kiwano - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#pragma once
#include <kiwano/2d/Sprite.h>
#include <kiwano/2d/TextActor.h>

namespace kiwano
{
	KGE_DECLARE_SMART_PTR(Button);
	KGE_DECLARE_SMART_PTR(SpriteButton);
	KGE_DECLARE_SMART_PTR(TextButton);

	/**
	* \~chinese
	* @brief 按钮
	*/
	class KGE_API Button
		: public virtual ObjectBase
	{
	public:
		/// \~chinese
		/// @brief 按钮回调函数
		using Callback = Function<void(Button* /* self */)>;

		Button();

		/// \~chinese
		/// @brief 构造按钮
		/// @param click 按钮点击回调函数
		explicit Button(Callback const& click);

		/// \~chinese
		/// @brief 构造按钮
		/// @param click 按钮点击回调函数
		/// @param pressed 按钮按下回调函数
		/// @param mouse_over 按钮移入回调函数
		/// @param mouse_out 按钮移出回调函数
		Button(Callback const& click, Callback const& pressed, Callback const& mouse_over, Callback const& mouse_out);

		virtual ~Button();

		/// \~chinese
		/// @brief 获取按钮状态是启用还是禁用
		bool IsEnable() const;

		/// \~chinese
		/// @brief 设置按钮启用或禁用
		void SetEnabled(bool enabled);

		/// \~chinese
		/// @brief 设置按钮点击后的回调函数
		void SetClickCallback(const Callback& func);

		/// \~chinese
		/// @brief 设置按钮被按下时的回调函数
		void SetPressedCallback(const Callback& func);

		/// \~chinese
		/// @brief 设置按钮被抬起时的回调函数
		void SetReleasedCallback(const Callback& func);

		/// \~chinese
		/// @brief 设置鼠标移入按钮时的回调函数
		void SetMouseOverCallback(const Callback& func);

		/// \~chinese
		/// @brief 设置鼠标移出按钮时的回调函数
		void SetMouseOutCallback(const Callback& func);

		/// \~chinese
		/// @brief 按钮状态
		enum class Status
		{
			Normal,		///< 普通
			Hover,		///< 鼠标在按钮内
			Pressed		///< 被按下
		};

		/// \~chinese
		/// @brief 设置按钮状态
		void SetStatus(Status status);

		/// \~chinese
		/// @brief 获取按钮状态
		Status GetStatus() const;

	protected:
		/// \~chinese
		/// @brief 更新按钮状态
		void UpdateStatus(Event* evt);

	private:
		bool		enabled_;
		Status		status_;
		Callback	click_callback_;
		Callback	pressed_callback_;
		Callback	released_callback_;
		Callback	mouse_over_callback_;
		Callback	mouse_out_callback_;
	};


	/// \~chinese
	/// @brief 精灵按钮
	class SpriteButton
		: public Sprite
		, public Button
	{
	public:
		SpriteButton();

		/// \~chinese
		/// @brief 构造精灵按钮
		/// @param click 按钮点击回调函数
		explicit SpriteButton(Callback const& click);

		/// \~chinese
		/// @brief 构造精灵按钮
		/// @param click 按钮点击回调函数
		/// @param pressed 按钮按下回调函数
		/// @param mouse_over 按钮移入回调函数
		/// @param mouse_out 按钮移出回调函数
		SpriteButton(Callback const& click, Callback const& pressed, Callback const& mouse_over, Callback const& mouse_out);
	};


	/// \~chinese
	/// @brief 文字按钮
	class TextButton
		: public TextActor
		, public Button
	{
	public:
		TextButton();

		/// \~chinese
		/// @brief 构造文字按钮
		/// @param click 按钮点击回调函数
		explicit TextButton(Callback const& click);

		/// \~chinese
		/// @brief 构造文字按钮
		/// @param click 按钮点击回调函数
		/// @param pressed 按钮按下回调函数
		/// @param mouse_over 按钮移入回调函数
		/// @param mouse_out 按钮移出回调函数
		TextButton(Callback const& click, Callback const& pressed, Callback const& mouse_over, Callback const& mouse_out);
	};
}