12864多级菜单实现,可方便实现无限级菜单(um0549) -

typedef struct menu//定义一个菜单
{
u8 range_from,range_to; //当前显示的项开始及结束序号
u8 itemCount;//项目总数
u8 selected;//当前选择项
u8 *menuItems[17];//菜单项目
struct menu **subMenus;//子菜单
struct menu *parent;//上级菜单 ,如果是顶级则为null
void (**func)();//选择相应项按确定键后执行的函数
}Menu;
Menu MainMenu = { //定义主菜单
0,3,4,0,//默认显示0-3项，总共4项，当前选择第0项
{
"设置1 ",
"设置2 ",
"输入指令发送 ",
"查询 "
}
};
Menu searchMenu = {//查询菜单
0,3,6,0,
{
"记帐记录明细 ",
"未采集记录数 ",
"设备机号 ",
"本机IP地址 ",
"记录空间大小 ",
"软件版本 "
}
};
Menu *currentMenu;//当前的菜单
用于显示菜单项
void display(u8 line) //显示菜单项并设置选中的项反白
{
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);//反白显示指定行
}
void func(void)
{
printf("hello");
}
初始化菜单:
void initMenu()
{
MainMenu.subMenus = malloc(sizeof(&MainMenu)*4);
MainMenu.subMenus[0] = NULL;//第1到3项没有子菜单置null,选择后程序会调用func中相应项中的函数
MainMenu.subMenus[1] = NULL;
MainMenu.subMenus[2] = NULL;
MainMenu.subMenus[3] = &searchMenu;//第四项查询有子菜单
MainMenu.func = malloc(sizeof(&func)*4);
MainMenu.func[0] = NULL;
MainMenu.func[1] = NULL;
MainMenu.func[2] = &func;//当选择了并按了确定，会执行func函数
MainMenu.func[3] = NULL;
MainMenu.parent = NULL;//表示是顶级菜单
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;//上一级菜单是MainMenu.进入查询子菜单后按返回键，将会显示这个菜单项
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",key);
switch(key)
{
case 12://向上
if(currentMenu->selected == 0)//到了第一项
break;
else
{
currentMenu->selected--;
if(currentMenu->selected < currentMenu->range_from)//更新显示的区域
{
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键
{
if(currentMenu->subMenus[currentMenu->selected] !=NULL)
{
currentMenu = currentMenu->subMenus[currentMenu->selected];
display(0);
}
else
{
if(currentMenu->func[currentMenu->selected] != NULL)
{
currentMenu->func[currentMenu->selected]();//执行相应的函数
display(currentMenu->selected);//返回后恢复原来的菜单状态
}
}
break;
}
case 3://返回键
{
if(currentMenu->parent!=NULL)//父菜单不为空，将显示父菜单
{
currentMenu = currentMenu->parent;
display(currentMenu->selected);
}
break;
}
default:
break;
}
delay_ms(10);
}
}

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