// 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 "../2d/Sprite.h"
#include <functional>

namespace kiwano
{
	class KGE_API Button
		: public Sprite
	{
	public:
		using Callback = Function<void()>;

		Button();

		explicit Button(
			Callback const& click		/* 按钮点击回调函数 */
		);

		Button(
			Callback const& click,		/* 按钮点击回调函数 */
			Callback const& pressed,	/* 按钮按下回调函数 */
			Callback const& mouse_over,	/* 按钮移入回调函数 */
			Callback const& mouse_out	/* 按钮移出回调函数 */
		);

		virtual ~Button();

		// 获取按钮状态是启用还是禁用
		bool IsEnable() const;

		// 设置按钮启用或禁用
		void SetEnabled(
			bool enabled
		);

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

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

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

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

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

	private:
		enum class Status { Normal, Hover, Pressed };

		void SetStatus(
			Status status
		);

		void UpdateStatus(Event const& evt);

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