2.游戏引擎Win32平台 用户输入事件Input类实现

企业开发 2022-10-03 21:43:42 阅读次数: 0

        Input类主要实现的功能是 监听用户鼠标键盘事件，当收到操作系统回调之后首先会调到场景管理类，然后通过场景管理类，会调到Input类，然后Input类会传递给KeyInput类和MouseInput处理鼠标和键盘相关的逻辑代码。

        MouseInput被调起的时候，会记录当前鼠标在屏幕中的坐标点，然后更新鼠标的状态。代码详见程序1.1

        KeyInput被调起的时候，会更新当前键盘的状态，按下或者是抬起。详见程序1.2

程序1.1

LRESULT MouseInput::msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	if (_code == LButton)
	{
		if (msg == WM_LBUTTONDOWN)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseDown;
		}
		else if (msg == WM_LBUTTONUP)
		{
			_event = MouseUp;
		}
	}
	else if (_code == MButton)
	{
		if (msg == WM_MBUTTONDOWN)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseDown;
		}
		else if (msg == WM_MBUTTONUP)
		{
			_event = MouseUp;
		}
	}
	else if (_code == RButton)
	{
		if (msg == WM_RBUTTONDOWN)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseDown;
		}
		else if (msg == WM_RBUTTONUP)
		{
			_event = MouseUp;
		}
	}

	else if (_code == Moving)
	{
		if (msg == WM_MOUSEMOVE)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseMove;
		}
	}

	else if (_code == Wheel)
	{
		if (msg == 0x020A/*WM_MOUSEWHEEL*/)
		{
			scroll = HIWORD(wParam);
			_event = WheelScroll;
		}
	}

	return 0;
}

程序1.2


LRESULT KeyInput::msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	if (msg == WM_KEYDOWN)
	{
		if (_event == None && _code == wParam)
		{
			_event = KeyDown;
		}
	}
	else if (msg == WM_KEYUP)
	{
		if (_code == wParam)
		{
			_event = KeyUp;
		}
	}

	return 0;
}

完整代码

Input.h

#pragma once

enum InputEvent//输入消息的事件
{
	None,
	MouseDown,
	Mouseing,
	MouseUp,
	WheelScroll,
	KeyDown,
	Keying,
	KeyUp,
	MouseMove
};

class InputBase
{
protected:
	InputEvent _event;
	int _code;
public:
	virtual void nextState() = 0;
	virtual LRESULT msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) = 0;
};


class KeyInput :public InputBase
{
public:
	KeyInput(int code);

	void nextState();

	LRESULT msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

	bool getKey()
	{
		return _event == Keying;
	}

	bool getKeyDown()
	{
		return _event == KeyDown;
	}

	bool getKeyUp()
	{
		return _event == KeyUp;
	}
};

struct MouseData
{
	short scroll;			//滚动码
	POINT delta;			//鼠标根据上一个点的偏移值
	POINT mousePos;			//现在的点
};

enum MouseCode
{
	LButton,
	MButton,
	RButton,
	Wheel,
	Moving
};

class MouseInput :public InputBase
{
private:
	short scroll;
	POINT ptLast;
	POINT pt;

public:
	MouseInput(MouseCode code);
	void nextState();
	LRESULT msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

	bool getMouse(MouseData * mouseData = NULL);
	bool getMouseMove(MouseData * mouseData = NULL);
	bool getMouseDown(MouseData * mouseData = NULL);
	bool getMouseUp(MouseData * mouseData = NULL);
	bool getMouseWheel(MouseData * mouseData = NULL);

};


class Input//管理类
{
private:
	static map<string, InputBase*> inputList;
public:
	static LRESULT msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
	static void flush();

	static bool getKey(int keyCode);
	static bool getKeyDown(int keyCode);
	static bool getKeyUp(int keyCode);

	static bool getMouse(MouseCode mouseCode, MouseData * mouseData = NULL);
	static bool getMouseDown(MouseCode mouseCode, MouseData * mouseData = NULL);
	static bool getMouseUp(MouseCode mouseCode, MouseData * mouseData = NULL);
	static bool getMouseWheel(MouseData * mouseData = NULL);
	static bool getMouseMove(MouseData * mouseData = NULL);
};

Input.cpp

#include "Engine.h"


KeyInput::KeyInput(int code)
{
	_event = None;
	_code = code;
}


void KeyInput::nextState()
{
	if (_event == KeyDown)
	{
		_event = Keying;
	}
	else if (_event == KeyUp)
	{
		_event = None;
	}
}

LRESULT KeyInput::msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	if (msg == WM_KEYDOWN)
	{
		if (_event == None && _code == wParam)
		{
			_event = KeyDown;
		}
	}
	else if (msg == WM_KEYUP)
	{
		if (_code == wParam)
		{
			_event = KeyUp;
		}
	}

	return 0;
}


MouseInput::MouseInput(MouseCode code)
{
	_event = None;
	_code = code;
}

void MouseInput::nextState()
{
	if (_event == MouseDown)
	{
		_event = Mouseing;
	}
	else if (_event == MouseUp)
	{
		_event = None;
	}
	else if (_event == WheelScroll)
	{
		_event = None;
	}
	else if (_event==MouseMove&&_event==MouseUp)
	{
		_event = MouseMove;
	}
	else if (_event==Mouseing)
	{
		ptLast = pt;
	}
}

LRESULT MouseInput::msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	if (_code == LButton)
	{
		if (msg == WM_LBUTTONDOWN)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseDown;
		}
		else if (msg == WM_LBUTTONUP)
		{
			_event = MouseUp;
		}
	}
	else if (_code == MButton)
	{
		if (msg == WM_MBUTTONDOWN)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseDown;
		}
		else if (msg == WM_MBUTTONUP)
		{
			_event = MouseUp;
		}
	}
	else if (_code == RButton)
	{
		if (msg == WM_RBUTTONDOWN)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseDown;
		}
		else if (msg == WM_RBUTTONUP)
		{
			_event = MouseUp;
		}
	}

	else if (_code == Moving)
	{
		if (msg == WM_MOUSEMOVE)
		{
			ptLast.x = LOWORD(lParam);
			ptLast.y = HIWORD(lParam);
			_event = MouseMove;
		}
	}

	else if (_code == Wheel)
	{
		if (msg == 0x020A/*WM_MOUSEWHEEL*/)
		{
			scroll = HIWORD(wParam);
			_event = WheelScroll;
		}
	}

	return 0;
}


bool MouseInput::getMouse(MouseData *mouseData)
{
	bool f = _event == Mouseing;
	if (f == true && mouseData != NULL)
	{
	
		GetCursorPos(&pt);
		ScreenToClient(CPlateForm::getInstance()->getHwnd(), &pt);
		mouseData->mousePos.x = pt.x;
		mouseData->mousePos.y = pt.y;

		mouseData->delta.x = pt.x - ptLast.x;
		mouseData->delta.y = pt.y - ptLast.y;

		mouseData->scroll = 0;

		
	}
	return f;
}


bool MouseInput::getMouseMove(MouseData *mouseData)
{
	bool f = _event == MouseMove;
	if (f == true && mouseData != NULL)
	{
		
		GetCursorPos(&pt);
		ScreenToClient(CPlateForm::getInstance()->getHwnd(), &pt);
		mouseData->mousePos.x = pt.x;
		mouseData->mousePos.y = pt.y;

		mouseData->delta.x = pt.x - ptLast.x;
		mouseData->delta.y = pt.y - ptLast.y;
		mouseData->scroll = 0;

		ptLast = pt;

		GLint   viewport[4]; //视口
		glGetIntegerv(GL_VIEWPORT, viewport); //得到的是最后一个设置视口的参数
		POINT st;
		st.x = viewport[2] * 0.5;
		st.y = viewport[3] * 0.5;
		ClientToScreen(CPlateForm::getInstance()->getHwnd(), &st);//应该是吧鼠标锁在窗口的中心点
		SetCursorPos(st.x, st.y);
	}
	return f;
}


bool MouseInput::getMouseDown(MouseData * mouseData)
{
	bool f = _event == MouseDown;
	if (f == true && mouseData != NULL)
	{
		POINT pt;
		GetCursorPos(&pt);
		ScreenToClient(CPlateForm::getInstance()->getHwnd(), &pt);
		memset(mouseData, 0, sizeof(MouseData));
		mouseData->mousePos.x = pt.x;
		mouseData->mousePos.y = pt.y;

	}
	return f;
}



bool MouseInput::getMouseUp(MouseData * mouseData)
{
	bool f = _event == MouseUp;
	if (f == true && mouseData != NULL)
	{
		POINT pt;
		GetCursorPos(&pt);
		ScreenToClient(CPlateForm::getInstance()->getHwnd(), &pt);//转换成像素点
		memset(mouseData, 0, sizeof(MouseData));
		mouseData->mousePos.x = pt.x;
		mouseData->mousePos.y = pt.y;
	}
	return f;
}

bool MouseInput::getMouseWheel(MouseData * mouseData)
{
	bool f = _event == WheelScroll;
	if (f == true && mouseData != NULL)
	{
		POINT pt;
		GetCursorPos(&pt);
		ScreenToClient(CPlateForm::getInstance()->getHwnd(), &pt);
		mouseData->mousePos.x = pt.x;
		mouseData->mousePos.y = pt.y;
		mouseData->scroll = scroll;

		ptLast = pt;
	}
	return f;
}


map<string, InputBase*> Input::inputList;
LRESULT Input::msgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	map<string, InputBase*>::iterator iter;
	for (iter = inputList.begin(); iter != inputList.end(); iter++)
	{
		iter->second->msgProc(hWnd, msg, wParam, lParam);
	}
	return 0;
}


void Input::flush()
{
	map<string, InputBase*>::iterator iter;
	for (iter = inputList.begin(); iter != inputList.end(); iter++)
	{
		iter->second->nextState();
	}
}


bool Input::getKey(int keyCode)
{
	static char str[20];
	sprintf(str, "key_%d", keyCode);
	if (inputList[str] == NULL)
	{
		inputList[str] = new KeyInput(keyCode);
	}
	return ((KeyInput*)inputList[str])->getKey();
}

bool Input::getKeyDown(int keyCode)
{
	static char str[20];
	sprintf(str, "key_%d", keyCode);
	if (inputList[str] == NULL)
	{
		inputList[str] = new KeyInput(keyCode);
	}
	return ((KeyInput*)inputList[str])->getKeyDown();
}

bool Input::getKeyUp(int keyCode)
{
	static char str[20];
	sprintf(str, "key_%d", keyCode);
	if (inputList[str] == NULL)
	{
		inputList[str] = new KeyInput(keyCode);
	}
	return ((KeyInput*)inputList[str])->getKeyUp();
}

bool Input::getMouse(MouseCode mouseCode, MouseData * mouseData)
{
	static char str[20];
	sprintf(str, "mouse_%d", mouseCode);
	if (inputList[str] == NULL)
	{
		inputList[str] = new MouseInput(mouseCode);
	}
	return ((MouseInput*)inputList[str])->getMouse(mouseData);
}

bool Input::getMouseDown(MouseCode mouseCode, MouseData * mouseData)
{
	static char str[20];
	sprintf(str, "mouse_%d", mouseCode);
	if (inputList[str] == NULL)
	{
		inputList[str] = new MouseInput(mouseCode);
	}
	return ((MouseInput*)inputList[str])->getMouseDown(mouseData);
}

bool Input::getMouseUp(MouseCode mouseCode, MouseData * mouseData)
{
	static char str[20];
	sprintf(str, "mouse_%d", mouseCode);
	if (inputList[str] == NULL)
	{
		inputList[str] = new MouseInput(mouseCode);
	}
	return ((MouseInput*)inputList[str])->getMouseUp(mouseData);
}

bool Input::getMouseWheel(MouseData * mouseData)
{
	if (inputList["wheel"] == NULL)
	{
		inputList["wheel"] = new MouseInput(MouseCode::Wheel);
	}
	return ((MouseInput*)inputList["wheel"])->getMouseWheel(mouseData);
}


bool Input::getMouseMove(MouseData * mouseData)
{
	if (inputList["move"] == NULL)
	{
		inputList["move"] = new MouseInput(MouseCode::Moving);
	}
	return ((MouseInput*)inputList["move"])->getMouseMove(mouseData);
}

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