1.Timer定时器

Timer定时器的功能是计算已经运行的时长、到达指定时间间隔后执行指定任务(函数)
其成员变量有

float pass_time = 0;   //已过时间
float wait_time = 0;   //等待时间
bool paused = false;   //是否暂停
bool shotted = false;  //是否触发
bool one_shot = false; //单次触发
std::function<void()> on_timeout;  //回调函数

#ifndef _TIMER_H_
#define _TIMER_H_

#include <functional>

class Timer
{
public:
	Timer() = default;
	~Timer() = default;

	void restart()  //重启
	{
		pass_time = 0;
		shotted = false;
	}

	void set_wait_time(float val)
	{
		wait_time = val;
	}

	void set_one_shot(bool flag)
	{
		one_shot = flag;
	}

	void set_ontimeout(std::function<void()> on_timeout)
	{
		this->on_timeout = on_timeout;
	}

	void pause()
	{
		paused = true;
	}

	void resume()
	{
		paused = false;
	}

	void on_update(float delta)
	{
		if (paused) return;

		pass_time += delta;
		if (pass_time >= wait_time)
		{
			bool can_shot = (!one_shot || (one_shot && !shotted));
			shotted = true;
			if (can_shot && on_timeout)
				on_timeout();
			pass_time -= wait_time;
		}
	}

private:
	float pass_time = 0;   //已过时间
	float wait_time = 0;   //等待时间
	bool paused = false;   //是否暂停
	bool shotted = false;  //是否触发
	bool one_shot = false; //单次触发
	std::function<void()> on_timeout;
};
#endif