/**
* Signal function of the scrollable part of the roller.
* @param roller_scrl ointer to the scrollable part of roller (page)
* @param sign a signal type from lv_signal_t enum
* @param param pointer to a signal specific variable
* @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
*/
static lv_res_t lv_roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_scrl_signal(roller_scrl, sign, param);
if(res != LV_RES_OK) return res;
lv_indev_t * indev = lv_indev_get_act();
int32_t id = -1;
lv_obj_t * roller = lv_obj_get_parent(roller_scrl);
lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
if(ext->ddlist.label == NULL) return LV_RES_INV; /*On delete the ddlist signal deletes the label so nothing left to do here*/
lv_style_t * style_label = lv_obj_get_style(ext->ddlist.label);
const lv_font_t * font = style_label->text.font;
lv_coord_t font_h = lv_font_get_height_scale(font);
if(sign == LV_SIGNAL_DRAG_END) {
/*If dragged then align the list to there be an element in the middle*/
lv_coord_t label_y1 = ext->ddlist.label->coords.y1 - roller->coords.y1;
lv_coord_t label_unit = font_h + style_label->text.line_space;
lv_coord_t mid = (roller->coords.y2 - roller->coords.y1) / 2;
id = (mid - label_y1 + style_label->text.line_space / 2) / label_unit;
if(id < 0) id = 0;
if(id >= ext->ddlist.option_cnt) id = ext->ddlist.option_cnt - 1;
ext->ddlist.sel_opt_id = id;
if(ext->ddlist.action) ext->ddlist.action(roller);
}
else if(sign == LV_SIGNAL_RELEASED) {
/*If picked an option by clicking then set it*/
if(!lv_indev_is_dragging(indev)) {
lv_point_t p;
lv_indev_get_point(indev, &p);
p.y = p.y - ext->ddlist.label->coords.y1;
id = p.y / (font_h + style_label->text.line_space);
if(id < 0) id = 0;
if(id >= ext->ddlist.option_cnt) id = ext->ddlist.option_cnt - 1;
ext->ddlist.sel_opt_id = id;
if(ext->ddlist.action) ext->ddlist.action(roller);
}
}
/*Position the scrollable according to the new selected option*/
if(id != -1) {
refr_position(roller, true);
}
return res;
}
/**
* Called when a drop down list is released to open it or set new option
* @param ddlist pointer to a drop down list object
* @return LV_ACTION_RES_INV if the ddlist it deleted in the user callback else LV_ACTION_RES_OK
*/
static lv_res_t lv_ddlist_release_action(lv_obj_t * ddlist)
{
lv_ddlist_ext_t * ext = lv_obj_get_ext_attr(ddlist);
if(ext->opened == 0) { /*Open the list*/
ext->opened = 1;
lv_obj_set_drag(lv_page_get_scrl(ddlist), true);
} else {
ext->opened = 0;
lv_obj_set_drag(lv_page_get_scrl(ddlist), false);
/*Search the clicked option*/
lv_indev_t *indev = lv_indev_get_act();
lv_point_t p;
lv_indev_get_point(indev, &p);
p.x -= ext->label->coords.x1;
p.y -= ext->label->coords.y1;
uint16_t letter_i;
letter_i = lv_label_get_letter_on(ext->label, &p);
uint16_t new_opt = 0;
const char * txt = lv_label_get_text(ext->label);
uint16_t i;
for(i = 0; i < letter_i; i++) {
if(txt[i] == '\n') new_opt ++;
}
ext->sel_opt_id = new_opt;
if(ext->action != NULL) {
ext->action(ddlist);
}
}
lv_ddlist_refr_size(ddlist, true);
return LV_RES_OK;
}
/**
* Signal function of the switch
* @param sw pointer to a switch object
* @param sign a signal type from lv_signal_t enum
* @param param pointer to a signal specific variable
* @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
*/
static lv_res_t lv_sw_signal(lv_obj_t * sw, lv_signal_t sign, void * param)
{
lv_sw_ext_t * ext = lv_obj_get_ext_attr(sw);
/*Save the current (old) value before slider signal modifies it*/
int16_t old_val;
if(sign == LV_SIGNAL_PRESSING) old_val = ext->slider.drag_value;
else old_val = lv_slider_get_value(sw);
/*Do not let the slider to call the callback. The Switch will do it if required*/
lv_action_t slider_action = ext->slider.action;
ext->slider.action = NULL;
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_signal(sw, sign, param);
if(res != LV_RES_OK) return res;
if(sign == LV_SIGNAL_CLEANUP) {
/*Nothing to cleanup. (No dynamically allocated memory in 'ext')*/
}
else if(sign == LV_SIGNAL_PRESSED) {
/*Save the x coordinate of the pressed point to see if the switch was slid*/
lv_indev_t * indev = lv_indev_get_act();
if(indev) {
lv_point_t p;
lv_indev_get_point(indev, &p);
ext->start_x = p.x;
}
ext->slided = 0;
ext->changed = 0;
}
else if(sign == LV_SIGNAL_PRESSING) {
/*See if the switch was slid*/
lv_indev_t * indev = lv_indev_get_act();
if(indev) {
lv_point_t p = {0,0};
lv_indev_get_point(indev, &p);
if(LV_MATH_ABS(p.x - ext->start_x) > LV_INDEV_DRAG_LIMIT) ext->slided = 1;
}
/*If didn't slide then revert the min/max value. So click without slide won't move the switch as a slider*/
if(ext->slided == 0) {
if(lv_sw_get_state(sw)) ext->slider.drag_value = LV_SWITCH_SLIDER_ANIM_MAX;
else ext->slider.drag_value = 0;
}
/*If explicitly changed (by slide) don't need to be toggled on release*/
int16_t threshold = LV_SWITCH_SLIDER_ANIM_MAX / 2;
if((old_val < threshold && ext->slider.drag_value > threshold) ||
(old_val > threshold && ext->slider.drag_value < threshold))
{
ext->changed = 1;
}
}
else if(sign == LV_SIGNAL_PRESS_LOST) {
if(lv_sw_get_state(sw)) {
lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_on);
#if USE_LV_ANIMATION
lv_sw_anim_to_value(sw, LV_SWITCH_SLIDER_ANIM_MAX);
#endif
}
else {
lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_off);
#if USE_LV_ANIMATION
lv_sw_anim_to_value(sw, 0);
#endif
}
}
else if(sign == LV_SIGNAL_RELEASED) {
/*If not dragged then toggle the switch*/
if(ext->changed == 0) {
if(lv_sw_get_state(sw)) lv_sw_off_anim(sw);
else lv_sw_on_anim(sw);
if(slider_action != NULL) res = slider_action(sw);
}
/*If the switch was dragged then calculate the new state based on the current position*/
else {
int16_t v = lv_slider_get_value(sw);
if(v > LV_SWITCH_SLIDER_ANIM_MAX / 2) lv_sw_on_anim(sw);
else lv_sw_off_anim(sw);
if(slider_action != NULL) res = slider_action(sw);
}
} else if(sign == LV_SIGNAL_CONTROLL) {
char c = *((char *)param);
if(c == LV_GROUP_KEY_ENTER) {
if(old_val) lv_sw_off_anim(sw);
else lv_sw_on_anim(sw);
if(slider_action) res = slider_action(sw);
} else if(c == LV_GROUP_KEY_UP || c == LV_GROUP_KEY_RIGHT) {
lv_sw_on_anim(sw);
if(slider_action) res = slider_action(sw);
} else if(c == LV_GROUP_KEY_DOWN || c == LV_GROUP_KEY_LEFT) {
lv_sw_off_anim(sw);
if(slider_action) res = slider_action(sw);
}
} else if(sign == LV_SIGNAL_GET_EDITABLE) {
bool * editable = (bool *)param;
*editable = false; /*The ancestor slider is editable the switch is not*/
} else if(sign == LV_SIGNAL_GET_TYPE) {
lv_obj_type_t * buf = param;
uint8_t i;
for(i = 0; i < LV_MAX_ANCESTOR_NUM - 1; i++) { /*Find the last set data*/
if(buf->type[i] == NULL) break;
}
buf->type[i] = "lv_sw";
}
/*Restore the callback*/
if(res == LV_RES_OK) ext->slider.action = slider_action;
return res;
}
