LVGL7.5版本 触摸与键盘输入(API)对接（一）
前言：
- 前提条件:
- 已完成移植lvgl
- 本篇文章将重点讲解Keypad键盘按键
一、indev输入设备的种类介绍
- Touchpad （触摸板，例如电容屏、电阻屏等）
- Mouse (鼠标)
- Keypad (键盘)
- Encoder (编码器)
- Button (外部按键)
二、移植Touchpad与Keypad
void lv_port_indev_init(void)
{
lv_indev_drv_t indev_drv;
/*------------------
* Touchpad
* -----------------*/
//触摸屏
/*Initialize your touchpad if you have*/
touchpad_init();
/*Register a touchpad input device*/
lv_indev_drv_init(&indev_drv);
indev_drv.type = LV_INDEV_TYPE_POINTER;
indev_drv.read_cb = touchpad_read;
indev_touchpad = lv_indev_drv_register(&indev_drv);
//按键
/*------------------
* Keypad
* -----------------*/
/*Initialize your keypad or keyboard if you have*/
keypad_init();
/*Register a keypad input device*/
lv_indev_drv_init(&indev_drv);
indev_drv.type = LV_INDEV_TYPE_KEYPAD;
indev_drv.read_cb = keypad_read;
indev_keypad = lv_indev_drv_register(&indev_drv);
/* Later you should create group(s) with `lv_group_t * group = lv_group_create()`,
* add objects to the group with `lv_group_add_obj(group, obj)`
* and assign this input device to group to navigate in it:
* `lv_indev_set_group(indev_keypad, group);` */
}
Touchpad
触摸屏移植只需要结合自己的TP驱动完成这两个函数
/*Return true is the touchpad is pressed*/
static bool touchpad_is_pressed(void)
{
if (TouchItOccurred == SET)
{
TouchItOccurred = RESET;
/*Your code comes here*/
//判断是否有被按下
BSP_TS_GetState(&TS_State);
if(TS_State.touchDetected)
{
if(TS_State.touchEventId[0]==0x03)
{
return true;
}
}
}
return false;
}
/*Get the x and y coordinates if the touchpad is pressed*/
static void touchpad_get_xy(lv_coord_t * x, lv_coord_t * y)
{
BSP_TS_GetState(&TS_State);
if(TS_State.touchDetected)
{
/*Your code comes here*/
//按下所获得的坐标
(*x) = TS_State.touchX[0];
(*y) = TS_State.touchY[0];
}
//log("x %d,y %d",TS_State.touchX[0],TS_State.touchY[0]);
}
Keypad
目前只做了一个按键返回值做为测试
/* Will be called by the library to read the mouse */
static bool keypad_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data)
{
static uint32_t last_key = 0;
/*Get the current x and y coordinates*/
mouse_get_xy(&data->point.x, &data->point.y);
/*Get whether the a key is pressed and save the pressed key*/
uint32_t act_key = keypad_get_key();
if(act_key != 0) {
data->state = LV_INDEV_STATE_PR;
/*Translate the keys to LVGL control characters according to your key definitions*/
switch(act_key) {
case 1:
act_key = LV_KEY_NEXT;
break;
case 2:
act_key = LV_KEY_PREV;
break;
case 3:
act_key = LV_KEY_LEFT;
break;
case 4:
act_key = LV_KEY_RIGHT;
break;
case 5:
act_key = LV_KEY_ENTER;
break;
}
last_key = act_key;
} else {
data->state = LV_INDEV_STATE_REL;
}
data->key = last_key;
/*Return `false` because we are not buffering and no more data to read*/
return false;
}
/*Get the currently being pressed key. 0 if no key is pressed*/
static uint32_t keypad_get_key(void)
{
uint8_t key_val=0;
/*Your code comes here*/
//读取按键是否被按下
key_val=KEY_Scan(0);
if(key_val>0)
return key_val;
return 0;
}
Keypad测试示例
此测试利用tabview创建tab1与tab2，在两个tab分别使用不同的图片，按下按键由tab1->tab2,再次按下又由tab2->tab1
lv_obj_t *nihao;
lv_obj_t *tab1;
lv_obj_t *tab2;
lv_group_t *test_group; //定义一个新的对象组
LV_IMG_DECLARE(huoxingtest); //此处为测试定义的图片
LV_IMG_DECLARE(muxingtest);//此处为测试定义的图片
extern lv_indev_t * indev_keypad;
static void event_callback(lv_obj_t * obj, lv_event_t event)
{
if(event == LV_EVENT_KEY){
const uint32_t *key = lv_event_get_data();
if(*key == LV_KEY_RIGHT){
if(obj==tab1)
{
lv_group_focus_next(test_group);//切换焦点obj
lv_tabview_set_tab_act(nihao,1,LV_ANIM_OFF);
}
else if(obj==tab2)
{
lv_group_focus_prev(test_group);
lv_tabview_set_tab_act(nihao,0,LV_ANIM_OFF);
}
}
}
}
void app_test(void)
{
test_group=lv_group_create(); //创建对象组
lv_indev_set_group(indev_keypad,test_group); //关联输入设备与对象组
nihao=lv_tabview_create(lv_scr_act(),NULL);
lv_obj_set_pos(nihao,0,0);
lv_obj_set_size(nihao,390,390);
lv_tabview_set_btns_pos(nihao,LV_TABVIEW_TAB_POS_NONE);
lv_obj_set_style_local_border_width(nihao,LV_PAGE_PART_BG,LV_STATE_DEFAULT,0);
lv_obj_set_style_local_bg_color(nihao,LV_PAGE_PART_BG,LV_STATE_DEFAULT,LV_COLOR_BLACK);
tab1=lv_tabview_add_tab(nihao,"tab1");
lv_page_set_scrlbar_mode(tab1,LV_SCRLBAR_MODE_OFF);
lv_obj_t *img1=lv_img_create(tab1,NULL);
lv_obj_set_pos(img1,0,0);
lv_img_set_src(img1,&huoxingtest);
lv_obj_set_event_cb(tab1,event_callback);
tab2=lv_tabview_add_tab(nihao,"tab2");
lv_page_set_scrlbar_mode(tab2,LV_SCRLBAR_MODE_OFF);
lv_obj_t *img2=lv_img_create(tab2,NULL);
lv_obj_set_pos(img2,0,0);
lv_img_set_src(img2,&muxingtest);
lv_obj_set_event_cb(tab2,event_callback);
lv_group_add_obj(test_group,tab1);
lv_group_add_obj(test_group,tab2);
lv_group_set_editing(test_group,false);
}
本篇完
总结：按键触发响应，需要将对象加入group中，通过焦点的切换完成对event事件具体的响应，KEY值做出对应的策略，目前只做了一个按键对应的KEY的测试，后续将测试不同键值对应的操作，如果文中有不正确的地方，欢迎赐教！！！
