#include "menudrv.h"
extern void functest();
const menu code menu_table[] = {
     {"",null,0,0,0,0},//定義一個不存在的菜單
     {"文件",null,0,2,0,7},//1
     {"編輯",null,1,3,0,0},//2
     {"搜索",null,2,4,0,0},//3
     {"項目",null,3,5,0,0},//4
     {"執行",null,4,6,0,0},//5
     {"窗口",null,5,0,0,0},//6
     {"打開",null,0,8,1,0},//7
     {"關閉",functest,7,0,1,0},//8
};

unsigned char curr_pos;//光標位置行號
unsigned char curr_menu_id;//當前菜單下標

void menu_esc()//上一級 ,退出
{
 if(menu_table[curr_menu_id].up != 0){
     cls();
     view_menu(menu_table[curr_menu_id].up);
 }//退出菜單的處理
}
void menu_ok()//確定
{//有下一級菜單
 if(menu_table[curr_menu_id].down != 0){
     cls();
     view_menu(menu_table[curr_menu_id].down);
     return;
 }
 //有操作函數
 if(menu_table[curr_menu_id].oper != null){
     menu_table[curr_menu_id].oper();
     return;
 }
}
void view_menu(unsigned char i)//顯示菜單
{
  menu *p;

  curr_pos = 0;
  curr_menu_id = i;
  p = &menu_table[i];
  for(i = 0;i < 4;i++){
      location(0,i);
      print(p->str);
      if(p->next == 0) break;
      p = &menu_table[p->next];
  }
  inv_line(curr_pos,0xff);
}
void menu_up()//上一條
{
 unsigned char p;
 unsigned char i;

 p = curr_menu_id;
 if(menu_table[p].prv == 0) return;//沒上一條的情況

 if(curr_pos != 0){//當前光標不在最上
      inv_line(curr_pos,0x00);
      curr_pos--;
      inv_line(curr_pos,0xff);
      curr_menu_id = menu_table[p].prv;
 }else{
       //當前光標在最上,再寫菜單項
       curr_menu_id = menu_table[p].prv;
       p = curr_menu_id;
       for(i = 0;i < 4;i++){
             location(0,i);
             print(menu_table[p].str);
             if(menu_table[p].next == 0) break;
             p = menu_table[p].next;
       }
 }
}
void menu_down()//下一條
{
 unsigned char p;
 unsigned char i;

 p = curr_menu_id;
 if(menu_table[p].next == 0) return;//沒下一條的情況

 if(curr_pos != 3){//當前光標不在最下
      inv_line(curr_pos,0x00);
      curr_pos++;
      inv_line(curr_pos,0xff);
      curr_menu_id = menu_table[p].next;
 }else{
       //當前光標在最下,再寫菜單項
       curr_menu_id = menu_table[p].next;
       p = menu_table[p].prv;
       p = menu_table[p].prv;
       for(i = 0;i < 4;i++){
             location(0,i);
             print(menu_table[p].str);
             if(menu_table[p].next == 0) break;
             p = menu_table[p].next;
       }
 }
}