傻孩子菜单框架（转）

#include <stdio.h>
#include <string.h>

#define Null 0
char over=0; //结束标志

//结构体类型定义 
struct MenuItem     
{  
    char MenuCount; //结构体数组的元素个数 
    char *DisplayString;  //当前LCD显示的信息 
    void (*Subs)();  //执行的函数的指针. 
    struct MenuItem *Childrenms;  //指向子节点的指针 
    struct MenuItem *Parentms;  //指向父节点的指针 
}; 

//函数声明 
void Nop(void); 
void DoSomething(struct MenuItem *manyou); 
void GameOver(void); 
void Locate(struct MenuItem *manyou); 
void Run(struct MenuItem *manyou);

//==================================== 
//结构体声明 
struct MenuItem m0_main[4]; 
struct MenuItem m1_file[5]; 
struct MenuItem m1_edit[4]; 
struct MenuItem m1_view[2]; 
struct MenuItem m2_font[3]; 
struct MenuItem m1_help[3];

//==================================== 
//结构体实现 
struct MenuItem m0_main[4]= 
{ 
    {4,"file",Nop,m1_file,Null}, 
    {4,"edit",Nop,m1_edit,Null}, 
    {4,"view",Nop,m1_view,Null}, 
    {4,"help",Nop,m1_help,Null}, 
};

struct MenuItem m1_file[5]= 
{ 
    {5,"open",DoSomething,Null,m0_main}, 
    {5,"save",DoSomething,Null,m0_main}, 
    {5,"save as",DoSomething,Null,m0_main}, 
    {5,"print",DoSomething,Null,m0_main}, 
    {5,"exit",GameOver,Null,m0_main}, 
};

struct MenuItem m1_edit[4]= 
{ 
    {4,"undo",DoSomething,Null,m0_main}, 
    {4,"redo",DoSomething,Null,m0_main}, 
    {4,"copy",DoSomething,Null,m0_main}, 
    {4,"paste",DoSomething,Null,m0_main}, 
};

struct MenuItem m1_view[2]= 
{ 
    {2,"font",Nop,m2_font,m0_main}, 
    {2,"color",DoSomething,Null,m0_main}, 
};

struct MenuItem m2_font[3]= 
{ 
    {3,"songti",DoSomething,Null,m1_view}, 
    {3,"heiti",DoSomething,Null,m1_view}, 
    {3,"youyuan",DoSomething,Null,m1_view}, 
};

struct MenuItem m1_help[3]= 
{ 
    {3,"index",DoSomething,Null,m0_main}, 
    {3,"online",DoSomething,Null,m0_main}, 
    {3,"about",DoSomething,Null,m0_main}, 
};

//==================================== 
//函数实现 
void Locate(struct MenuItem *manyou) 
{ 
    printf("Now we at %s\n" ,manyou->DisplayString); 
}

void Run(struct MenuItem *manyou) 
{ 
    (*(manyou->Subs))(manyou); 
}

void Nop(void) 
{}

void DoSomething(struct MenuItem *manyou) 
{ 
    printf("we have done %s\n" ,manyou->DisplayString); 
}

void GameOver(void) 
{ 
    over=1; 
    printf("Now Game is Over "); 
    getchar(); 
}

//==================================== 
//主函数 
int main(int argc, char *argv[]) 
{ 
    char charin; //输入的字符 
    char menuid[3]={0,0,0}; //某一级的菜单的偏移量的记录数组 
    char i=0; //上面数组的下标值

    struct MenuItem *manyou; //漫游,在菜单中漫游

    manyou=&m0_main[0]; //开始的位置 
    Locate(manyou); //输出

    while (!over) //如果还没完 
    { 
        charin=getchar(); //读取键盘字符 
        switch (charin) //根据字符跳转 
        { 
        case ‘0‘: //到同级菜单的后一项 
            { 
                menuid[i]++; 
                if (menuid[i]>manyou->MenuCount-1) menuid[i]=0;//可以看到MenuCount项是必要的 
                Locate(manyou+menuid[i]); 
                break; 
            } 
        case ‘1‘: //到同级菜单的前一项 
            { 
                if (menuid[i]==0) menuid[i]=manyou->MenuCount-1;//可以看到MenuCount项是必要的 
                else menuid[i]--; 
                Locate(manyou+menuid[i]); 
                break; 
            } 
        case ‘+‘: //到下一级菜单,无下级时执行某功能 
            { 
                if ((manyou+menuid[i])->Childrenms !=Null) 
                { 
                    manyou=(manyou+menuid[i])->Childrenms; 
                    i++; 
                    menuid[i]=0; 
                    Locate(manyou+menuid[i]); 
                } 
                else 
                { 
                    Run(manyou+menuid[i]); 
                } 
                break; 
            } 
        case ‘-‘: //到上一级菜单,无上级时给出些提示 
            { 
                if ((manyou+menuid[i])->Parentms !=Null) 
                { 
                    manyou=(manyou+menuid[i])->Parentms; 
                    i--; 
                    Locate(manyou+menuid[i]); 
                } 
                else 
                { 
                    printf("You are at the top of menu"); 
                } 
                break; 
            } 
        default:  break; 
        } 
    } 
    return 0; 
}