tolua++初探（五）

最新推荐文章于 2024-05-31 09:52:37 发布

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<采用了单继承的类的导出> 这个……，tolua++支持采用了单继承的类的直接导出，在lua中可以像在C++中那样访问基类的方法。和其它简单类的导出没什么区别。只是个简单的示例，我们定义一个控件基类，从它派生一个按钮类。然后在lua中分别访问基类和按钮类的方法。我们导出一个全局变量lbutton，同时也在lua中生成一个新button。先看实际的头文件inheritance.h，我把实现也写在了头文件里。

#ifndef _CLASS_INHERITANCE_H

#define _CLASS_INHERITANCE_H

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include <string>

typedef enum

{

AUICSNormal = 0,

AUICSHover = 1,

AUICSPushed = 2,

AUICSDisabled = 3,

AUICSHide = 4,

AUICSFORCEDOWRD = 0xFFFFFFFF

}

AUIControlState;

class CAUIControl

{

public:

//should not be called from lua scripts

CAUIControl():m_nID(-1), m_state(AUICSNormal), m_bVisible(true), m_bEnable(true), m_fAlpha(0.0f),m_strText("")

{}

virtual ~CAUIControl(){}

public:

//tolua

void SetID(int nID){ m_nID = nID; }

int GetID(){ return m_nID; }

void SetText(char * szText){ m_strText = szText; }

const char * GetText(){ return m_strText.c_str(); }

void SetPosition(POINT pt){ m_position = pt; }

POINT GetPosition(){ return m_position; }

void SetSize(SIZE sz){ m_size = sz; }

SIZE GetSize(){ return m_size; }

void SetVisible(bool bVisible){ m_bVisible = bVisible; }

bool IsVisible(){ return m_bVisible; }

void SetEnabled(bool bEnable){ m_bEnable=bEnable; }

bool IsEnabled(){ return m_bEnable; }

void SetAlpha(float fAlpha){ m_fAlpha=fAlpha; }

float GetAlpha(){ return m_fAlpha; }

public:

//should not be called from lua scripts

virtual void Render() = 0;

virtual bool MsgProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam){return false;}

protected:

int m_nID;

AUIControlState m_state;

bool m_bVisible;

bool m_bEnable;

POINT m_position;

SIZE m_size;

float m_fAlpha;

std::string m_strText;

};

class CAUIButton : public CAUIControl

{

public:

CAUIButton():m_pTexture(NULL)

{}

virtual ~CAUIButton(){}

public:

void SetTexture(char * szFile){}

void SetTextureRects(const RECT & rcNormal, const RECT &rcHover, const RECT &rcPushed, const RECT& rcDisabled){}

void SetAlpha(float fAlpha){ m_fAlpha = fAlpha; printf("CAUIButton::SetAlpha, extra process here! "); }

public:

void Render(){printf("CAUIButton::Render ");}

bool MsgProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam){ printf("CAUIButton::MsgProc "); return false;}

protected:

void * LoadTexture(char * szTextureFile){return NULL;}

void * m_pTexture;

RECT m_rects[4];

};

extern CAUIButton g_button;

#endif

g_button的实例定义在main函数所在的文件中。下面是inheritance.pkg文件：

$#include "inheritance.h"

class CAUIControl

{

public:

//tolua

void SetID(int nID);

int GetID();

void SetText(char * szText);

const char * GetText();

void SetPosition(POINT pt);

POINT GetPosition();

void SetSize(SIZE sz);

SIZE GetSize();

void SetVisible(bool bVisible);

bool IsVisible();

void SetEnabled(bool bEnable);

bool IsEnabled();

void SetAlpha(float fAlpha);

float GetAlpha();

};

class CAUIButton : public CAUIControl

{

public:

CAUIButton();

virtual ~CAUIButton();

public:

void SetTexture(char * szFile);

void SetTextureRects(const RECT & rcNormal, const RECT &rcHover, const RECT &rcPushed, const RECT& rcDisabled);

void SetAlpha(float fAlpha);

};

extern CAUIButton g_button@lbutton;

对于基类CAUIControl，只导出部分方法，不导出构造函数，不允许在Lua中直接生成其实例。派生类CAUIButton可以在lua中生成实例。CAUIButton重写了基类的SetAlpha函数也增加了一些新的函数，如设置纹理函数SetTexture。全局变量的导出很简单，extern CAUIButton g_button@lbutton;一个语句就可以了。我们还可以为其加上tolua_readonly修饰符。我把它重名为lbutton。好了，下面用tolua++.exe生成inherit.cpp文件：

tolua++.exe -n inherit -o inherit.cpp inheritance.pkg

接下来是驱动文件inheritance.cpp：

#include "lua.hpp"

#include "inheritance.h"

int tolua_inherit_open(lua_State *);

CAUIButton g_button;

int _tmain(int argc, _TCHAR* argv[])

{

lua_State * L = luaL_newstate();

luaopen_base(L);

tolua_inherit_open(L);

luaL_dofile(L, "../scripts/inheritance.lua");