原创 在TC2.0中实现菜单【转】

//源程序
#include <stdio.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\"
",manyou->DisplayString);        
}

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

void Nop(void)
{}

void DoSomething(struct MenuItem *manyou)
{
        printf("we have done \"%s\"
",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++;
                                        if (menuid>manyou->MenuCount-1) menuid=0;//可以看到MenuCount项是必要的
                                        Locate(manyou+menuid);
                                        break;
                                }
                        case '1':                                        //到同级菜单的前一项
                                {
                                        if (menuid==0) menuid=manyou->MenuCount-1;//可以看到MenuCount项是必要的
                                        else menuid--;                                        
                                        Locate(manyou+menuid);
                                        break;
                                }
                        case '+':                                        //到下一级菜单,无下级时执行某功能
                                {
                                        if ((manyou+menuid)->Childrenms !=Null)
                                        {
                                                manyou=(manyou+menuid)->Childrenms;
                                                i++;
                                                menuid=0;
                                                Locate(manyou+menuid);
                                        }
                                        else
                                        {
                                                Run(manyou+menuid);
                                        }
                                        break;
                                }
                        case '-':                                        //到上一级菜单,无上级时给出些提示
                                {
                                        if ((manyou+menuid)->Parentms !=Null)
                                        {
                                                manyou=(manyou+menuid)->Parentms;
                                                i--;
                                                Locate(manyou+menuid);
                                        }
                                        else
                                        {
                                                printf("You are at the top of menu
");
                                        }
                                        break;
                                }        
                        default:                 break;
                }
        }        
        return 0;
}