运行效果图:
选择查询项：
选择查询项并按确定键后：
此时按返回键，将会返回到第二个图片中的界面
首先定义一个菜单结构
- 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);
- }
- }
ST公司关于STM3210E-EVAL演示版本的工程中就有菜单的代码，现分享给大家：
um0549.rar
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