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lv_event.c
429 lines (361 loc) · 11.5 KB
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lv_event.c
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/**
* @file lv_event.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_obj.h"
#include "lv_indev.h"
/*********************
* DEFINES
*********************/
#define MY_CLASS &lv_obj_class
/**********************
* TYPEDEFS
**********************/
typedef struct _lv_event_dsc_t{
lv_event_cb_t cb;
void * user_data;
lv_event_code_t filter :8;
}lv_event_dsc_t;
/**********************
* STATIC PROTOTYPES
**********************/
static lv_event_dsc_t * lv_obj_get_event_dsc(const lv_obj_t * obj, uint32_t id);
static lv_res_t event_send_core(lv_event_t * e);
static bool event_is_bubbled(lv_event_code_t e);
/**********************
* STATIC VARIABLES
**********************/
static lv_event_t * event_head;
/**********************
* MACROS
**********************/
#if LV_LOG_TRACE_EVENT
# define EVENT_TRACE(...) LV_LOG_TRACE( __VA_ARGS__)
#else
# define EVENT_TRACE(...)
#endif
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_res_t lv_event_send(lv_obj_t * obj, lv_event_code_t event_code, void * param)
{
if(obj == NULL) return LV_RES_OK;
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_event_t e;
e.target = obj;
e.current_target = obj;
e.code = event_code;
e.user_data = NULL;
e.param = param;
e.deleted = 0;
/*Build a simple linked list from the objects used in the events
*It's important to know if an this object was deleted by a nested event
*called from this `event_cb`.*/
e.prev = event_head;
event_head = &e;
/*Send the event*/
lv_res_t res = event_send_core(&e);
/*Remove this element from the list*/
event_head = e.prev;
return res;
}
lv_res_t lv_obj_event_base(const lv_obj_class_t * class_p, lv_event_t * e)
{
const lv_obj_class_t * base;
if(class_p == NULL) base = e->current_target->class_p;
else base = class_p->base_class;
/*Find a base in which Call the ancestor's event handler_cb is set*/
while(base && base->event_cb == NULL) base = base->base_class;
if(base == NULL) return LV_RES_OK;
if(base->event_cb == NULL) return LV_RES_OK;
/*Call the actual event callback*/
e->user_data = NULL;
base->event_cb(base, e);
lv_res_t res = LV_RES_OK;
/*Stop if the object is deleted*/
if(e->deleted) res = LV_RES_INV;
return res;
}
lv_obj_t * lv_event_get_target(lv_event_t * e)
{
return e->target;
}
lv_obj_t * lv_event_get_current_target(lv_event_t * e)
{
return e->current_target;
}
lv_event_code_t lv_event_get_code(lv_event_t * e)
{
return e->code;
}
void * lv_event_get_param(lv_event_t * e)
{
return e->param;
}
void * lv_event_get_user_data(lv_event_t * e)
{
return e->user_data;
}
uint32_t lv_event_register_id(void)
{
static uint32_t last_id = _LV_EVENT_LAST;
last_id ++;
return last_id;
}
void _lv_event_mark_deleted(lv_obj_t * obj)
{
lv_event_t * e = event_head;
while(e) {
if(e->current_target == obj || e->target == obj) e->deleted = 1;
e = e->prev;
}
}
struct _lv_event_dsc_t * lv_obj_add_event_cb(lv_obj_t * obj, lv_event_cb_t event_cb, lv_event_code_t filter, void * user_data)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_obj_allocate_spec_attr(obj);
obj->spec_attr->event_dsc_cnt++;
obj->spec_attr->event_dsc = lv_mem_realloc(obj->spec_attr->event_dsc, obj->spec_attr->event_dsc_cnt * sizeof(lv_event_dsc_t));
LV_ASSERT_MALLOC(obj->spec_attr->event_dsc);
obj->spec_attr->event_dsc[obj->spec_attr->event_dsc_cnt - 1].cb = event_cb;
obj->spec_attr->event_dsc[obj->spec_attr->event_dsc_cnt - 1].filter = filter;
obj->spec_attr->event_dsc[obj->spec_attr->event_dsc_cnt - 1].user_data = user_data;
return &obj->spec_attr->event_dsc[obj->spec_attr->event_dsc_cnt - 1];
}
bool lv_obj_remove_event_cb(lv_obj_t * obj, lv_event_cb_t event_cb)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
if(obj->spec_attr == NULL) return false;
int32_t i = 0;
for(i = 0; i < obj->spec_attr->event_dsc_cnt; i++) {
if(obj->spec_attr->event_dsc[i].cb == event_cb) {
/*Shift the remaining event handlers forward*/
for(; i < (obj->spec_attr->event_dsc_cnt-1); i++) {
obj->spec_attr->event_dsc[i].cb = obj->spec_attr->event_dsc[i+1].cb;
obj->spec_attr->event_dsc[i].user_data = obj->spec_attr->event_dsc[i+1].user_data;
}
obj->spec_attr->event_dsc_cnt--;
obj->spec_attr->event_dsc = lv_mem_realloc(obj->spec_attr->event_dsc, obj->spec_attr->event_dsc_cnt * sizeof(lv_event_dsc_t));
LV_ASSERT_MALLOC(obj->spec_attr->event_dsc);
return true;
}
}
/*No event handler found*/
return false;
}
bool lv_obj_remove_event_dsc(lv_obj_t * obj, struct _lv_event_dsc_t * event_dsc)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
if(obj->spec_attr == NULL) return false;
int32_t i = 0;
for(i = 0; i < obj->spec_attr->event_dsc_cnt; i++) {
if(&obj->spec_attr->event_dsc[i] == event_dsc) {
/*Shift the remaining event handlers forward*/
for(; i < (obj->spec_attr->event_dsc_cnt-1); i++) {
obj->spec_attr->event_dsc[i].cb = obj->spec_attr->event_dsc[i+1].cb;
obj->spec_attr->event_dsc[i].user_data = obj->spec_attr->event_dsc[i+1].user_data;
}
obj->spec_attr->event_dsc_cnt--;
obj->spec_attr->event_dsc = lv_mem_realloc(obj->spec_attr->event_dsc, obj->spec_attr->event_dsc_cnt * sizeof(lv_event_dsc_t));
LV_ASSERT_MALLOC(obj->spec_attr->event_dsc);
return true;
}
}
/*No event handler found*/
return false;
}
lv_indev_t * lv_event_get_indev(lv_event_t * e)
{
if(e->code == LV_EVENT_PRESSED ||
e->code == LV_EVENT_PRESSING ||
e->code == LV_EVENT_PRESS_LOST ||
e->code == LV_EVENT_SHORT_CLICKED ||
e->code == LV_EVENT_LONG_PRESSED ||
e->code == LV_EVENT_LONG_PRESSED_REPEAT ||
e->code == LV_EVENT_CLICKED ||
e->code == LV_EVENT_RELEASED ||
e->code == LV_EVENT_SCROLL_BEGIN ||
e->code == LV_EVENT_SCROLL_END ||
e->code == LV_EVENT_SCROLL ||
e->code == LV_EVENT_GESTURE ||
e->code == LV_EVENT_KEY ||
e->code == LV_EVENT_FOCUSED ||
e->code == LV_EVENT_DEFOCUSED ||
e->code == LV_EVENT_LEAVE)
{
return lv_event_get_param(e);
} else {
LV_LOG_WARN("Not interpreted with this event code");
return NULL;
}
}
lv_obj_draw_part_dsc_t * lv_event_get_draw_part_dsc(lv_event_t * e)
{
if(e->code == LV_EVENT_DRAW_PART_BEGIN||
e->code == LV_EVENT_DRAW_PART_END)
{
return lv_event_get_param(e);
} else {
LV_LOG_WARN("Not interpreted with this event code");
return NULL;
}
}
const lv_area_t * lv_event_get_clip_area(lv_event_t * e)
{
if(e->code == LV_EVENT_DRAW_MAIN ||
e->code == LV_EVENT_DRAW_MAIN_BEGIN ||
e->code == LV_EVENT_DRAW_MAIN_END ||
e->code == LV_EVENT_DRAW_POST ||
e->code == LV_EVENT_DRAW_POST_BEGIN ||
e->code == LV_EVENT_DRAW_POST_END)
{
return lv_event_get_param(e);
} else {
LV_LOG_WARN("Not interpreted with this event code");
return NULL;
}
}
const lv_area_t * lv_event_get_old_size(lv_event_t * e)
{
if(e->code == LV_EVENT_SIZE_CHANGED) {
return lv_event_get_param(e);
} else {
LV_LOG_WARN("Not interpreted with this event code");
return NULL;
}
}
uint32_t lv_event_get_key(lv_event_t * e)
{
if(e->code == LV_EVENT_KEY) {
uint32_t * k = lv_event_get_param(e);
if(k) return *k;
else return 0;
} else {
LV_LOG_WARN("Not interpreted with this event code");
return 0;
}
}
lv_anim_t * lv_event_get_scroll_anim(lv_event_t * e)
{
if(e->code == LV_EVENT_SCROLL_BEGIN) {
return lv_event_get_param(e);
} else {
LV_LOG_WARN("Not interpreted with this event code");
return 0;
}
}
void lv_event_set_ext_draw_size(lv_event_t * e, lv_coord_t size)
{
if(e->code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
lv_coord_t * cur_size = lv_event_get_param(e);
*cur_size = LV_MAX(*cur_size, size);
} else {
LV_LOG_WARN("Not interpreted with this event code");
}
}
lv_point_t * lv_event_get_self_size_info(lv_event_t * e)
{
if(e->code == LV_EVENT_GET_SELF_SIZE) {
return lv_event_get_param(e);
} else {
LV_LOG_WARN("Not interpreted with this event code");
return 0;
}
}
lv_hit_test_info_t * lv_event_get_hit_test_info(lv_event_t * e)
{
if(e->code == LV_EVENT_HIT_TEST) {
return lv_event_get_param(e);
} else {
LV_LOG_WARN("Not interpreted with this event code");
return 0;
}
}
const lv_area_t * lv_event_get_cover_area(lv_event_t * e)
{
if(e->code == LV_EVENT_COVER_CHECK) {
lv_cover_check_info_t * p = lv_event_get_param(e);
return p->area;
} else {
LV_LOG_WARN("Not interpreted with this event code");
return NULL;
}
}
void lv_event_set_cover_res(lv_event_t * e, lv_cover_res_t res)
{
if(e->code == LV_EVENT_COVER_CHECK) {
lv_cover_check_info_t * p = lv_event_get_param(e);
if(res > p->res) p->res = res; /*Save only "stronger" results*/
} else {
LV_LOG_WARN("Not interpreted with this event code");
}
}
/**********************
* STATIC FUNCTIONS
**********************/
static lv_event_dsc_t * lv_obj_get_event_dsc(const lv_obj_t * obj, uint32_t id)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
if(!obj->spec_attr) return NULL;
if(id >= obj->spec_attr->event_dsc_cnt) return NULL;
return &obj->spec_attr->event_dsc[id];
}
static lv_res_t event_send_core(lv_event_t * e)
{
EVENT_TRACE("Sending event %d to %p with %p param", e->code, e->current_target, e->param);
/*Call the input device's feedback callback if set*/
lv_indev_t * indev_act = lv_indev_get_act();
if(indev_act) {
if(indev_act->driver->feedback_cb) indev_act->driver->feedback_cb(indev_act->driver, e->code);
}
lv_event_dsc_t * event_dsc = lv_obj_get_event_dsc(e->current_target, 0);
lv_res_t res = LV_RES_OK;
res = lv_obj_event_base(NULL, e);
uint32_t i = 0;
while(event_dsc && res == LV_RES_OK) {
if(event_dsc->cb && (event_dsc->filter == LV_EVENT_ALL || event_dsc->filter == e->code)) {
e->user_data = event_dsc->user_data;
event_dsc->cb(e);
/*Stop if the object is deleted*/
if(e->deleted) return LV_RES_INV;
}
i++;
event_dsc = lv_obj_get_event_dsc(e->current_target, i);
}
if(res == LV_RES_OK && event_is_bubbled(e->code)) {
if(lv_obj_has_flag(e->current_target, LV_OBJ_FLAG_EVENT_BUBBLE) && e->current_target->parent) {
e->current_target = e->current_target->parent;
res = event_send_core(e);
if(res != LV_RES_OK) return LV_RES_INV;
}
}
return res;
}
static bool event_is_bubbled(lv_event_code_t e)
{
switch(e) {
case LV_EVENT_HIT_TEST:
case LV_EVENT_COVER_CHECK:
case LV_EVENT_REFR_EXT_DRAW_SIZE:
case LV_EVENT_DRAW_MAIN_BEGIN:
case LV_EVENT_DRAW_MAIN:
case LV_EVENT_DRAW_MAIN_END:
case LV_EVENT_DRAW_POST_BEGIN:
case LV_EVENT_DRAW_POST:
case LV_EVENT_DRAW_POST_END:
case LV_EVENT_DRAW_PART_BEGIN:
case LV_EVENT_DRAW_PART_END:
case LV_EVENT_REFRESH:
case LV_EVENT_DELETE:
case LV_EVENT_CHILD_CHANGED:
case LV_EVENT_SIZE_CHANGED:
case LV_EVENT_STYLE_CHANGED:
case LV_EVENT_GET_SELF_SIZE:
return false;
default:
return true;
}
}