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Menu searchMenu = {//查詢菜單
0,3,6,0,
{
  "記帳記錄明細 ",
  "未采集記錄數 ",
  "設備機號       ",
  "本機IP地址    ",
  "記錄空間大小 ",
  "軟件版本       "
}
};
Menu *currentMenu;//當前的菜單

用于顯示菜單項
void display(u8 line) //顯示菜單項并設置選中的項反白
{
int i;
line = 3-(currentMenu->range_to-line);
Lcd_Fill(0x00);
for(i = 0;i<4;i++)
{
  Lcd_Disp(i+1,0,currentMenu->menuItems[i+currentMenu->range_from]);
}
highlight(0,line,8,255);//反白顯示指定行
}
void func(void)
{

printf("hello\r\n");
}
初始化菜單:
void initMenu()
{
MainMenu.subMenus = malloc(sizeof(&MainMenu)*4);
MainMenu.subMenus[0] = NULL;//第1到3項沒有子菜單置null,選擇后程序會調用func中相應項中的函數
MainMenu.subMenus[1] = NULL;
MainMenu.subMenus[2] = NULL;
MainMenu.subMenus[3] = &searchMenu;//第四項查詢有子菜單
MainMenu.func = malloc(sizeof(&func)*4);
MainMenu.func[0] = NULL;
MainMenu.func[1] = NULL;
MainMenu.func[2] = &func;//當選擇了并按了確定，會執行func函數
MainMenu.func[3] = NULL;
MainMenu.parent = NULL;//表示是頂級菜單

searchMenu.subMenus = malloc(sizeof(&searchMenu)*6);
searchMenu.subMenus[0] = searchMenu.subMenus[1] = searchMenu.subMenus[2] = searchMenu.subMenus[3] = searchMenu.subMenus[4] = searchMenu.subMenus[5] = NULL;
searchMenu.func = malloc(sizeof(&printf)*6);
searchMenu.func[0] = searchMenu.func[2] = searchMenu.func[2] = searchMenu.func[3] = searchMenu.func[4] = searchMenu.func[5] = NULL;
searchMenu.parent = &MainMenu;//上一級菜單是MainMenu.進入查詢子菜單后按返回鍵，將會顯示這個菜單項

currentMenu = &MainMenu;

}

main

int main(void)
{

  delay_init();
  uart_init(9600);
  Lcd_Init();
  KEY_Init();
  initMenu();
  display(currentMenu->selected);
  while(1)
{
  key = KEY_Scan();
  if(key == 0)
  {
delay_ms(10);
continue;
  }
  printf("key %d is press\r\n",key);
  switch(key)
  {
case 12://向上
if(currentMenu->selected == 0)//到了第一項
   break;
else
{
   currentMenu->selected--;
   if(currentMenu->selected < currentMenu->range_from)//更新顯示的區域
   {
   currentMenu->range_from = currentMenu->selected;
   currentMenu->range_to = currentMenu->range_from+3;
   }
   display(currentMenu->selected);
   break;
}
case 8://向下
if(currentMenu->selected == currentMenu->itemCount-1)
   break;
else
{
   currentMenu->selected++;
   if(currentMenu->selected>currentMenu->range_to)
   {
   currentMenu->range_to = currentMenu->selected;
   currentMenu->range_from = currentMenu->range_to-3;
   }
   display(currentMenu->selected);
   break;
}
case 4://Enter鍵
{
if(currentMenu->subMenus[currentMenu->selected] !=NULL)
{
   currentMenu = currentMenu->subMenus[currentMenu->selected];
   display(0);
}
else
{
   if(currentMenu->func[currentMenu->selected] != NULL)
   {
   currentMenu->func[currentMenu->selected]();//執行相應的函數
   display(currentMenu->selected);//返回后恢復原來的菜單狀態
   }
}
break;
}
case 3://返回鍵
{
if(currentMenu->parent!=NULL)//父菜單不為空，將顯示父菜單
{
   currentMenu = currentMenu->parent;
   display(currentMenu->selected);
}
break;
}
default:
   break;
  }
  delay_ms(10);
}
}

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