/**
* 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_cb = 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_PRESSING) {
int16_t act_val = ext->slider.drag_value;
if(act_val != old_val) ext->changed = 1;
}
else if(sign == LV_SIGNAL_PRESS_LOST) {
ext->changed = 0;
if(lv_sw_get_state(sw)) lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_on);
else lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_off);
}
else if(sign == LV_SIGNAL_RELEASED) {
if(ext->changed == 0) {
int16_t v = lv_slider_get_value(sw);
if(v == 0) lv_slider_set_value(sw, 1);
else lv_slider_set_value(sw, 0);
}
if(lv_sw_get_state(sw)) lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_on);
else lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_off);
if(slider_cb != NULL) slider_cb(sw);
ext->changed = 0;
}
/*Restore the callback*/
ext->slider.action = slider_cb;
return res;
}
/**
* Toggle the position of the switch with an animation
* @param sw pointer to a switch object
* @return resulting state of the switch.
*/
bool lv_sw_toggle_anim(lv_obj_t *sw) {
bool state = lv_sw_get_state(sw);
if(state) {
lv_sw_off_anim(sw);
}
else {
lv_sw_on_anim(sw);
}
return !state;
}
/**
* Set a style of a switch
* @param sw pointer to a switch object
* @param type which style should be set
* @param style pointer to a style
*/
void lv_sw_set_style(lv_obj_t *sw, lv_sw_style_t type, lv_style_t *style)
{
lv_sw_ext_t * ext = lv_obj_get_ext_attr(sw);
switch (type) {
case LV_SLIDER_STYLE_BG:
lv_slider_set_style(sw, LV_SLIDER_STYLE_BG, style);
break;
case LV_SLIDER_STYLE_INDIC:
lv_bar_set_style(sw, LV_SLIDER_STYLE_INDIC, style);
break;
case LV_SW_STYLE_KNOB_OFF:
ext->style_knob_off = style;
if(lv_sw_get_state(sw) == 0) lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, style);
break;
case LV_SW_STYLE_KNOB_ON:
ext->style_knob_on = style;
if(lv_sw_get_state(sw) != 0) lv_slider_set_style(sw, LV_SLIDER_STYLE_KNOB, style);
break;
}
}
/**
* Create a switch objects
* @param par pointer to an object, it will be the parent of the new switch
* @param copy pointer to a switch object, if not NULL then the new object will be copied from it
* @return pointer to the created switch
*/
lv_obj_t * lv_sw_create(lv_obj_t * par, lv_obj_t * copy)
{
/*Create the ancestor of switch*/
lv_obj_t * new_sw = lv_slider_create(par, copy);
lv_mem_assert(new_sw);
if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_sw);
/*Allocate the switch type specific extended data*/
lv_sw_ext_t * ext = lv_obj_allocate_ext_attr(new_sw, sizeof(lv_sw_ext_t));
lv_mem_assert(ext);
/*Initialize the allocated 'ext' */
ext->changed = 0;
ext->style_knob_off = ext->slider.style_knob;
ext->style_knob_on = ext->slider.style_knob;
/*The signal and design functions are not copied so set them here*/
lv_obj_set_signal_func(new_sw, lv_sw_signal);
/*Init the new switch switch*/
if(copy == NULL) {
lv_slider_set_range(new_sw, 0, 1);
lv_obj_set_size(new_sw, 2 * LV_DPI / 3, LV_DPI / 3);
lv_slider_set_knob_in(new_sw, true);
/*Set the default styles*/
lv_theme_t *th = lv_theme_get_current();
if(th) {
lv_sw_set_style(new_sw, LV_SW_STYLE_BG, th->sw.bg);
lv_sw_set_style(new_sw, LV_SW_STYLE_INDIC, th->sw.indic);
lv_sw_set_style(new_sw, LV_SW_STYLE_KNOB_OFF, th->sw.knob_off);
lv_sw_set_style(new_sw, LV_SW_STYLE_KNOB_ON, th->sw.knob_on);
} else {
/*Let the slider' style*/
}
}
/*Copy an existing switch*/
else {
lv_sw_ext_t *copy_ext = lv_obj_get_ext_attr(copy);
ext->style_knob_off = copy_ext->style_knob_off;
ext->style_knob_on = copy_ext->style_knob_on;
if(lv_sw_get_state(new_sw)) lv_slider_set_style(new_sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_on);
else lv_slider_set_style(new_sw, LV_SLIDER_STYLE_KNOB, ext->style_knob_off);
/*Refresh the style with new signal function*/
lv_obj_refresh_style(new_sw);
}
return new_sw;
}
/**
* 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;
}
