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lvgl_cpp/lvgl/widgets/lv_roller.c

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/**
* @file lv_roller.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_roller.h"
#if LV_USE_ROLLER != 0
#include "../misc/lv_assert.h"
#include "../draw/lv_draw.h"
#include "../core/lv_group.h"
#include "../core/lv_indev.h"
#include "../core/lv_indev_scroll.h"
/*********************
* DEFINES
*********************/
#define MY_CLASS &lv_roller_class
#define MY_CLASS_LABEL &lv_roller_label_class
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_roller_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_roller_event(const lv_obj_class_t * class_p, lv_event_t * e);
static void lv_roller_label_event(const lv_obj_class_t * class_p, lv_event_t * e);
static void draw_main(lv_event_t * e);
static void draw_label(lv_event_t * e);
static void get_sel_area(lv_obj_t * obj, lv_area_t * sel_area);
static void refr_position(lv_obj_t * obj, lv_anim_enable_t animen);
static lv_res_t release_handler(lv_obj_t * obj);
static void inf_normalize(lv_obj_t * obj_scrl);
static lv_obj_t * get_label(const lv_obj_t * obj);
static lv_coord_t get_selected_label_width(const lv_obj_t * obj);
static void scroll_anim_ready_cb(lv_anim_t * a);
static void set_y_anim(void * obj, int32_t v);
/**********************
* STATIC VARIABLES
**********************/
const lv_obj_class_t lv_roller_class = {
.constructor_cb = lv_roller_constructor,
.event_cb = lv_roller_event,
.width_def = LV_SIZE_CONTENT,
.height_def = LV_DPI_DEF,
.instance_size = sizeof(lv_roller_t),
.editable = LV_OBJ_CLASS_EDITABLE_TRUE,
.group_def = LV_OBJ_CLASS_GROUP_DEF_TRUE,
.base_class = &lv_obj_class
};
const lv_obj_class_t lv_roller_label_class = {
.event_cb = lv_roller_label_event,
.instance_size = sizeof(lv_label_t),
.base_class = &lv_label_class
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Create a roller object
* @param parent pointer to an object, it will be the parent of the new roller
* @return pointer to the created roller
*/
lv_obj_t * lv_roller_create(lv_obj_t * parent)
{
LV_LOG_INFO("begin");
lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
lv_obj_class_init_obj(obj);
return obj;
}
/*=====================
* Setter functions
*====================*/
/**
* Set the options on a roller
* @param roller pointer to roller object
* @param options a string with '\n' separated options. E.g. "One\nTwo\nThree"
* @param mode `LV_ROLLER_MODE_NORMAL` or `LV_ROLLER_MODE_INFINITE`
*/
void lv_roller_set_options(lv_obj_t * obj, const char * options, lv_roller_mode_t mode)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(options);
lv_roller_t * roller = (lv_roller_t *)obj;
lv_obj_t * label = get_label(obj);
roller->sel_opt_id = 0;
roller->sel_opt_id_ori = 0;
/*Count the '\n'-s to determine the number of options*/
roller->option_cnt = 0;
uint32_t cnt;
for(cnt = 0; options[cnt] != '\0'; cnt++) {
if(options[cnt] == '\n') roller->option_cnt++;
}
roller->option_cnt++; /*Last option has no `\n`*/
if(mode == LV_ROLLER_MODE_NORMAL) {
roller->mode = LV_ROLLER_MODE_NORMAL;
lv_label_set_text(label, options);
}
else {
roller->mode = LV_ROLLER_MODE_INFINITE;
size_t opt_len = strlen(options) + 1; /*+1 to add '\n' after option lists*/
char * opt_extra = lv_mem_buf_get(opt_len * LV_ROLLER_INF_PAGES);
uint8_t i;
for(i = 0; i < LV_ROLLER_INF_PAGES; i++) {
strcpy(&opt_extra[opt_len * i], options);
opt_extra[opt_len * (i + 1) - 1] = '\n';
}
opt_extra[opt_len * LV_ROLLER_INF_PAGES - 1] = '\0';
lv_label_set_text(label, opt_extra);
lv_mem_buf_release(opt_extra);
roller->sel_opt_id = ((LV_ROLLER_INF_PAGES / 2) + 0) * roller->option_cnt;
roller->option_cnt = roller->option_cnt * LV_ROLLER_INF_PAGES;
inf_normalize(obj);
}
roller->sel_opt_id_ori = roller->sel_opt_id;
/*If the selected text has larger font the label needs some extra draw padding to draw it.*/
lv_obj_refresh_ext_draw_size(label);
}
/**
* Set the selected option
* @param roller pointer to a roller object
* @param sel_opt id of the selected option (0 ... number of option - 1);
* @param anim_en LV_ANIM_ON: set with animation; LV_ANOM_OFF set immediately
*/
void lv_roller_set_selected(lv_obj_t * obj, uint16_t sel_opt, lv_anim_enable_t anim)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
/*Set the value even if it's the same as the current value because
*if moving to the next option with an animation which was just deleted in the PRESS Call the ancestor's event handler
*nothing will continue the animation.*/
lv_roller_t * roller = (lv_roller_t *)obj;
/*In infinite mode interpret the new ID relative to the currently visible "page"*/
if(roller->mode == LV_ROLLER_MODE_INFINITE) {
uint32_t real_option_cnt = roller->option_cnt / LV_ROLLER_INF_PAGES;
uint16_t current_page = roller->sel_opt_id / real_option_cnt;
/*Set by the user to e.g. 0, 1, 2, 3...
*Upscale the value to the current page*/
if(sel_opt < real_option_cnt) {
uint16_t act_opt = roller->sel_opt_id - current_page * real_option_cnt;
int32_t sel_opt_signed = sel_opt;
/*Huge jump? Probably from last to first or first to last option.*/
if(LV_ABS((int16_t)act_opt - sel_opt) > real_option_cnt / 2) {
if(act_opt > sel_opt) sel_opt_signed += real_option_cnt;
else sel_opt_signed -= real_option_cnt;
}
sel_opt = sel_opt_signed + real_option_cnt * current_page;
}
}
roller->sel_opt_id = sel_opt < roller->option_cnt ? sel_opt : roller->option_cnt - 1;
roller->sel_opt_id_ori = roller->sel_opt_id;
refr_position(obj, anim);
}
/**
* Set the height to show the given number of rows (options)
* @param roller pointer to a roller object
* @param row_cnt number of desired visible rows
*/
void lv_roller_set_visible_row_count(lv_obj_t * obj, uint8_t row_cnt)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
lv_coord_t border_width = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_obj_set_height(obj, (lv_font_get_line_height(font) + line_space) * row_cnt + 2 * border_width);
}
/*=====================
* Getter functions
*====================*/
/**
* Get the id of the selected option
* @param roller pointer to a roller object
* @return id of the selected option (0 ... number of option - 1);
*/
uint16_t lv_roller_get_selected(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_roller_t * roller = (lv_roller_t *)obj;
if(roller->mode == LV_ROLLER_MODE_INFINITE) {
uint16_t real_id_cnt = roller->option_cnt / LV_ROLLER_INF_PAGES;
return roller->sel_opt_id % real_id_cnt;
}
else {
return roller->sel_opt_id;
}
}
/**
* Get the current selected option as a string
* @param ddlist pointer to ddlist object
* @param buf pointer to an array to store the string
* @param buf_size size of `buf` in bytes. 0: to ignore it.
*/
void lv_roller_get_selected_str(const lv_obj_t * obj, char * buf, uint32_t buf_size)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_roller_t * roller = (lv_roller_t *)obj;
lv_obj_t * label = get_label(obj);
uint32_t i;
uint16_t line = 0;
const char * opt_txt = lv_label_get_text(label);
size_t txt_len = strlen(opt_txt);
for(i = 0; i < txt_len && line != roller->sel_opt_id; i++) {
if(opt_txt[i] == '\n') line++;
}
uint32_t c;
for(c = 0; i < txt_len && opt_txt[i] != '\n'; c++, i++) {
if(buf_size && c >= buf_size - 1) {
LV_LOG_WARN("lv_dropdown_get_selected_str: the buffer was too small");
break;
}
buf[c] = opt_txt[i];
}
buf[c] = '\0';
}
/**
* Get the options of a roller
* @param roller pointer to roller object
* @return the options separated by '\n'-s (E.g. "Option1\nOption2\nOption3")
*/
const char * lv_roller_get_options(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
return lv_label_get_text(get_label(obj));
}
/**
* Get the total number of options
* @param roller pointer to a roller object
* @return the total number of options
*/
uint16_t lv_roller_get_option_cnt(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_roller_t * roller = (lv_roller_t *)obj;
if(roller->mode == LV_ROLLER_MODE_INFINITE) {
return roller->option_cnt / LV_ROLLER_INF_PAGES;
}
else {
return roller->option_cnt;
}
}
/**********************
* STATIC FUNCTIONS
**********************/
static void lv_roller_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
lv_roller_t * roller = (lv_roller_t *)obj;
roller->mode = LV_ROLLER_MODE_NORMAL;
roller->option_cnt = 0;
roller->sel_opt_id = 0;
roller->sel_opt_id_ori = 0;
lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLLABLE);
lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_VER);
LV_LOG_INFO("begin");
lv_obj_t * label = lv_obj_class_create_obj(&lv_roller_label_class, obj);
lv_obj_class_init_obj(label);
lv_roller_set_options(obj, "Option 1\nOption 2\nOption 3\nOption 4\nOption 5", LV_ROLLER_MODE_NORMAL);
LV_LOG_TRACE("finshed");
}
static void lv_roller_event(const lv_obj_class_t * class_p, lv_event_t * e)
{
LV_UNUSED(class_p);
lv_res_t res;
/*Call the ancestor's event handler*/
res = lv_obj_event_base(MY_CLASS, e);
if(res != LV_RES_OK) return;
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target(e);
lv_roller_t * roller = (lv_roller_t *)obj;
if(code == LV_EVENT_GET_SELF_SIZE) {
lv_point_t * p = lv_event_get_param(e);
p->x = get_selected_label_width(obj);
}
else if(code == LV_EVENT_STYLE_CHANGED) {
lv_obj_t * label = get_label(obj);
/*Be sure the label's style is updated before processing the roller*/
if(label) lv_event_send(label, LV_EVENT_STYLE_CHANGED, NULL);
lv_obj_refresh_self_size(obj);
refr_position(obj, LV_ANIM_OFF);
}
else if(code == LV_EVENT_SIZE_CHANGED) {
refr_position(obj, LV_ANIM_OFF);
}
else if(code == LV_EVENT_PRESSED) {
roller->moved = 0;
lv_anim_del(get_label(obj), set_y_anim);
}
else if(code == LV_EVENT_PRESSING) {
lv_indev_t * indev = lv_indev_get_act();
lv_point_t p;
lv_indev_get_vect(indev, &p);
if(p.y) {
lv_obj_t * label = get_label(obj);
lv_obj_set_y(label, lv_obj_get_y(label) + p.y);
roller->moved = 1;
}
}
else if(code == LV_EVENT_RELEASED || code == LV_EVENT_PRESS_LOST) {
release_handler(obj);
}
else if(code == LV_EVENT_FOCUSED) {
lv_group_t * g = lv_obj_get_group(obj);
bool editing = lv_group_get_editing(g);
lv_indev_type_t indev_type = lv_indev_get_type(lv_indev_get_act());
/*Encoders need special handling*/
if(indev_type == LV_INDEV_TYPE_ENCODER) {
/*In navigate mode revert the original value*/
if(!editing) {
if(roller->sel_opt_id != roller->sel_opt_id_ori) {
roller->sel_opt_id = roller->sel_opt_id_ori;
refr_position(obj, LV_ANIM_ON);
}
}
/*Save the current state when entered to edit mode*/
else {
roller->sel_opt_id_ori = roller->sel_opt_id;
}
}
else {
roller->sel_opt_id_ori = roller->sel_opt_id; /*Save the current value. Used to revert this state if
ENTER won't be pressed*/
}
}
else if(code == LV_EVENT_DEFOCUSED) {
/*Revert the original state*/
if(roller->sel_opt_id != roller->sel_opt_id_ori) {
roller->sel_opt_id = roller->sel_opt_id_ori;
refr_position(obj, LV_ANIM_ON);
}
}
else if(code == LV_EVENT_KEY) {
char c = *((char *)lv_event_get_param(e));
if(c == LV_KEY_RIGHT || c == LV_KEY_DOWN) {
if(roller->sel_opt_id + 1 < roller->option_cnt) {
uint16_t ori_id = roller->sel_opt_id_ori; /*lv_roller_set_selected will overwrite this*/
lv_roller_set_selected(obj, roller->sel_opt_id + 1, LV_ANIM_ON);
roller->sel_opt_id_ori = ori_id;
}
}
else if(c == LV_KEY_LEFT || c == LV_KEY_UP) {
if(roller->sel_opt_id > 0) {
uint16_t ori_id = roller->sel_opt_id_ori; /*lv_roller_set_selected will overwrite this*/
lv_roller_set_selected(obj, roller->sel_opt_id - 1, LV_ANIM_ON);
roller->sel_opt_id_ori = ori_id;
}
}
}
else if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
lv_obj_t * label = get_label(obj);
lv_obj_refresh_ext_draw_size(label);
}
else if(code == LV_EVENT_DRAW_MAIN || code == LV_EVENT_DRAW_POST) {
draw_main(e);
}
}
static void lv_roller_label_event(const lv_obj_class_t * class_p, lv_event_t * e)
{
LV_UNUSED(class_p);
lv_res_t res;
lv_event_code_t code = lv_event_get_code(e);
/*LV_EVENT_DRAW_MAIN will be called in the draw function*/
if(code != LV_EVENT_DRAW_MAIN) {
/* Call the ancestor's event handler */
res = lv_obj_event_base(MY_CLASS_LABEL, e);
if(res != LV_RES_OK) return;
}
lv_obj_t * label = lv_event_get_target(e);
if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
/*If the selected text has a larger font it needs some extra space to draw it*/
lv_coord_t * s = lv_event_get_param(e);
lv_obj_t * obj = lv_obj_get_parent(label);
lv_coord_t sel_w = get_selected_label_width(obj);
lv_coord_t label_w = lv_obj_get_width(label);
*s = LV_MAX(*s, sel_w - label_w);
}
else if(code == LV_EVENT_SIZE_CHANGED) {
refr_position(lv_obj_get_parent(label), LV_ANIM_OFF);
}
else if(code == LV_EVENT_DRAW_MAIN) {
draw_label(e);
}
}
static void draw_main(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target(e);
if(code == LV_EVENT_DRAW_MAIN) {
/*Draw the selected rectangle*/
lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
lv_area_t sel_area;
get_sel_area(obj, &sel_area);
lv_draw_rect_dsc_t sel_dsc;
lv_draw_rect_dsc_init(&sel_dsc);
lv_obj_init_draw_rect_dsc(obj, LV_PART_SELECTED, &sel_dsc);
lv_draw_rect(draw_ctx, &sel_dsc, &sel_area);
}
/*Post draw when the children are drawn*/
else if(code == LV_EVENT_DRAW_POST) {
lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
lv_obj_init_draw_label_dsc(obj, LV_PART_SELECTED, &label_dsc);
/*Redraw the text on the selected area*/
lv_area_t sel_area;
get_sel_area(obj, &sel_area);
lv_area_t mask_sel;
bool area_ok;
area_ok = _lv_area_intersect(&mask_sel, draw_ctx->clip_area, &sel_area);
if(area_ok) {
lv_obj_t * label = get_label(obj);
/*Get the size of the "selected text"*/
lv_point_t res_p;
lv_txt_get_size(&res_p, lv_label_get_text(label), label_dsc.font, label_dsc.letter_space, label_dsc.line_space,
lv_obj_get_width(obj), LV_TEXT_FLAG_EXPAND);
/*Move the selected label proportionally with the background label*/
lv_coord_t roller_h = lv_obj_get_height(obj);
int32_t label_y_prop = label->coords.y1 - (roller_h / 2 +
obj->coords.y1); /*label offset from the middle line of the roller*/
label_y_prop = (label_y_prop * 16384) / lv_obj_get_height(
label); /*Proportional position from the middle line (upscaled by << 14)*/
/*Apply a correction with different line heights*/
const lv_font_t * normal_label_font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
lv_coord_t corr = (label_dsc.font->line_height - normal_label_font->line_height) / 2;
/*Apply the proportional position to the selected text*/
res_p.y -= corr;
int32_t label_sel_y = roller_h / 2 + obj->coords.y1;
label_sel_y += (label_y_prop * res_p.y) >> 14;
label_sel_y -= corr;
lv_coord_t bwidth = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_coord_t pleft = lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
lv_coord_t pright = lv_obj_get_style_pad_right(obj, LV_PART_MAIN);
/*Draw the selected text*/
lv_area_t label_sel_area;
label_sel_area.x1 = obj->coords.x1 + pleft + bwidth;
label_sel_area.y1 = label_sel_y;
label_sel_area.x2 = obj->coords.x2 - pright - bwidth;
label_sel_area.y2 = label_sel_area.y1 + res_p.y;
label_dsc.flag |= LV_TEXT_FLAG_EXPAND;
const lv_area_t * clip_area_ori = draw_ctx->clip_area;
draw_ctx->clip_area = &mask_sel;
lv_draw_label(draw_ctx, &label_dsc, &label_sel_area, lv_label_get_text(label), NULL);
draw_ctx->clip_area = clip_area_ori;
}
}
}
static void draw_label(lv_event_t * e)
{
/* Split the drawing of the label into an upper (above the selected area)
* and a lower (below the selected area)*/
lv_obj_t * label_obj = lv_event_get_target(e);
lv_obj_t * roller = lv_obj_get_parent(label_obj);
lv_draw_label_dsc_t label_draw_dsc;
lv_draw_label_dsc_init(&label_draw_dsc);
lv_obj_init_draw_label_dsc(roller, LV_PART_MAIN, &label_draw_dsc);
lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
/*If the roller has shadow or outline it has some ext. draw size
*therefore the label can overflow the roller's boundaries.
*To solve this limit the clip area to the "plain" roller.*/
const lv_area_t * clip_area_ori = draw_ctx->clip_area;
lv_area_t roller_clip_area;
if(!_lv_area_intersect(&roller_clip_area, draw_ctx->clip_area, &roller->coords)) return;
draw_ctx->clip_area = &roller_clip_area;
lv_area_t sel_area;
get_sel_area(roller, &sel_area);
lv_area_t clip2;
clip2.x1 = label_obj->coords.x1;
clip2.y1 = label_obj->coords.y1;
clip2.x2 = label_obj->coords.x2;
clip2.y2 = sel_area.y1;
if(_lv_area_intersect(&clip2, draw_ctx->clip_area, &clip2)) {
const lv_area_t * clip_area_ori2 = draw_ctx->clip_area;
draw_ctx->clip_area = &clip2;
lv_draw_label(draw_ctx, &label_draw_dsc, &label_obj->coords, lv_label_get_text(label_obj), NULL);
draw_ctx->clip_area = clip_area_ori2;
}
clip2.x1 = label_obj->coords.x1;
clip2.y1 = sel_area.y2;
clip2.x2 = label_obj->coords.x2;
clip2.y2 = label_obj->coords.y2;
if(_lv_area_intersect(&clip2, draw_ctx->clip_area, &clip2)) {
const lv_area_t * clip_area_ori2 = draw_ctx->clip_area;
draw_ctx->clip_area = &clip2;
lv_draw_label(draw_ctx, &label_draw_dsc, &label_obj->coords, lv_label_get_text(label_obj), NULL);
draw_ctx->clip_area = clip_area_ori2;
}
draw_ctx->clip_area = clip_area_ori;
}
static void get_sel_area(lv_obj_t * obj, lv_area_t * sel_area)
{
const lv_font_t * font_main = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
const lv_font_t * font_sel = lv_obj_get_style_text_font(obj, LV_PART_SELECTED);
lv_coord_t font_main_h = lv_font_get_line_height(font_main);
lv_coord_t font_sel_h = lv_font_get_line_height(font_sel);
lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
lv_coord_t d = (font_sel_h + font_main_h) / 2 + line_space;
sel_area->y1 = obj->coords.y1 + lv_obj_get_height(obj) / 2 - d / 2;
sel_area->y2 = sel_area->y1 + d;
lv_area_t roller_coords;
lv_obj_get_coords(obj, &roller_coords);
sel_area->x1 = roller_coords.x1;
sel_area->x2 = roller_coords.x2;
}
/**
* Refresh the position of the roller. It uses the id stored in: roller->ddlist.selected_option_id
* @param roller pointer to a roller object
* @param anim_en LV_ANIM_ON: refresh with animation; LV_ANOM_OFF: without animation
*/
static void refr_position(lv_obj_t * obj, lv_anim_enable_t anim_en)
{
lv_obj_t * label = get_label(obj);
if(label == NULL) return;
lv_text_align_t align = lv_obj_calculate_style_text_align(label, LV_PART_MAIN, lv_label_get_text(label));
switch(align) {
case LV_TEXT_ALIGN_CENTER:
lv_obj_set_x(label, (lv_obj_get_content_width(obj) - lv_obj_get_width(label)) / 2);
break;
case LV_TEXT_ALIGN_RIGHT:
lv_obj_set_x(label, lv_obj_get_content_width(obj) - lv_obj_get_width(label));
break;
case LV_TEXT_ALIGN_LEFT:
lv_obj_set_x(label, 0);
break;
}
lv_roller_t * roller = (lv_roller_t *)obj;
const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
lv_coord_t font_h = lv_font_get_line_height(font);
lv_coord_t h = lv_obj_get_content_height(obj);
uint16_t anim_time = lv_obj_get_style_anim_time(obj, LV_PART_MAIN);
/*Normally the animation's `end_cb` sets correct position of the roller if infinite.
*But without animations do it manually*/
if(anim_en == LV_ANIM_OFF || anim_time == 0) {
inf_normalize(obj);
}
int32_t id = roller->sel_opt_id;
lv_coord_t sel_y1 = id * (font_h + line_space);
lv_coord_t mid_y1 = h / 2 - font_h / 2;
lv_coord_t new_y = mid_y1 - sel_y1;
if(anim_en == LV_ANIM_OFF || anim_time == 0) {
lv_anim_del(label, set_y_anim);
lv_obj_set_y(label, new_y);
}
else {
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_var(&a, label);
lv_anim_set_exec_cb(&a, set_y_anim);
lv_anim_set_values(&a, lv_obj_get_y(label), new_y);
lv_anim_set_time(&a, anim_time);
lv_anim_set_ready_cb(&a, scroll_anim_ready_cb);
lv_anim_set_path_cb(&a, lv_anim_path_ease_out);
lv_anim_start(&a);
}
}
static lv_res_t release_handler(lv_obj_t * obj)
{
lv_obj_t * label = get_label(obj);
if(label == NULL) return LV_RES_OK;
lv_indev_t * indev = lv_indev_get_act();
lv_roller_t * roller = (lv_roller_t *)obj;
/*Leave edit mode once a new option is selected*/
lv_indev_type_t indev_type = lv_indev_get_type(indev);
if(indev_type == LV_INDEV_TYPE_ENCODER || indev_type == LV_INDEV_TYPE_KEYPAD) {
roller->sel_opt_id_ori = roller->sel_opt_id;
if(indev_type == LV_INDEV_TYPE_ENCODER) {
lv_group_t * g = lv_obj_get_group(obj);
if(lv_group_get_editing(g)) {
lv_group_set_editing(g, false);
}
}
}
if(lv_indev_get_type(indev) == LV_INDEV_TYPE_POINTER || lv_indev_get_type(indev) == LV_INDEV_TYPE_BUTTON) {
/*Search the clicked option (For KEYPAD and ENCODER the new value should be already set)*/
int16_t new_opt = -1;
if(roller->moved == 0) {
new_opt = 0;
lv_point_t p;
lv_indev_get_point(indev, &p);
p.y -= label->coords.y1;
p.x -= label->coords.x1;
uint32_t letter_i;
letter_i = lv_label_get_letter_on(label, &p);
const char * txt = lv_label_get_text(label);
uint32_t i = 0;
uint32_t i_prev = 0;
uint32_t letter_cnt = 0;
for(letter_cnt = 0; letter_cnt < letter_i; letter_cnt++) {
uint32_t letter = _lv_txt_encoded_next(txt, &i);
/*Count he lines to reach the clicked letter. But ignore the last '\n' because it
* still belongs to the clicked line*/
if(letter == '\n' && i_prev != letter_i) new_opt++;
i_prev = i;
}
}
else {
/*If dragged then align the list to have an element in the middle*/
const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
lv_coord_t font_h = lv_font_get_line_height(font);
lv_coord_t label_unit = font_h + line_space;
lv_coord_t mid = obj->coords.y1 + (obj->coords.y2 - obj->coords.y1) / 2;
lv_coord_t label_y1 = label->coords.y1 + lv_indev_scroll_throw_predict(indev, LV_DIR_VER);
int32_t id = (mid - label_y1) / label_unit;
if(id < 0) id = 0;
if(id >= roller->option_cnt) id = roller->option_cnt - 1;
new_opt = id;
}
if(new_opt >= 0) {
lv_roller_set_selected(obj, new_opt, LV_ANIM_ON);
}
}
uint32_t id = roller->sel_opt_id; /*Just to use uint32_t in event data*/
lv_res_t res = lv_event_send(obj, LV_EVENT_VALUE_CHANGED, &id);
return res;
}
/**
* Set the middle page for the roller if infinite is enabled
* @param roller pointer to a roller object
*/
static void inf_normalize(lv_obj_t * obj)
{
lv_roller_t * roller = (lv_roller_t *)obj;
if(roller->mode == LV_ROLLER_MODE_INFINITE) {
uint16_t real_id_cnt = roller->option_cnt / LV_ROLLER_INF_PAGES;
roller->sel_opt_id = roller->sel_opt_id % real_id_cnt;
roller->sel_opt_id += (LV_ROLLER_INF_PAGES / 2) * real_id_cnt; /*Select the middle page*/
roller->sel_opt_id_ori = roller->sel_opt_id % real_id_cnt;
roller->sel_opt_id_ori += (LV_ROLLER_INF_PAGES / 2) * real_id_cnt; /*Select the middle page*/
/*Move to the new id*/
const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
lv_coord_t font_h = lv_font_get_line_height(font);
lv_coord_t h = lv_obj_get_content_height(obj);
lv_obj_t * label = get_label(obj);
lv_coord_t sel_y1 = roller->sel_opt_id * (font_h + line_space);
lv_coord_t mid_y1 = h / 2 - font_h / 2;
lv_coord_t new_y = mid_y1 - sel_y1;
lv_obj_set_y(label, new_y);
}
}
static lv_obj_t * get_label(const lv_obj_t * obj)
{
return lv_obj_get_child(obj, 0);
}
static lv_coord_t get_selected_label_width(const lv_obj_t * obj)
{
lv_obj_t * label = get_label(obj);
if(label == NULL) return 0;
const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_SELECTED);
lv_coord_t letter_space = lv_obj_get_style_text_letter_space(obj, LV_PART_SELECTED);
const char * txt = lv_label_get_text(label);
lv_point_t size;
lv_txt_get_size(&size, txt, font, letter_space, 0, LV_COORD_MAX, LV_TEXT_FLAG_NONE);
return size.x;
}
static void scroll_anim_ready_cb(lv_anim_t * a)
{
lv_obj_t * obj = lv_obj_get_parent(a->var); /*The label is animated*/
inf_normalize(obj);
}
static void set_y_anim(void * obj, int32_t v)
{
lv_obj_set_y(obj, v);
}
#endif
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