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bl_mcu_sdk/components/lvgl/lv_widgets/lv_dropdown.c
jzlv d427e7fdda [style] format files by clang-format
2021-06-20 12:25:46 +08:00

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/**
* @file lv_ddlist.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_dropdown.h"
#if LV_USE_DROPDOWN != 0
#include "../lv_misc/lv_debug.h"
#include "../lv_draw/lv_draw.h"
#include "../lv_core/lv_group.h"
#include "../lv_core/lv_indev.h"
#include "../lv_core/lv_disp.h"
#include "../lv_themes/lv_theme.h"
#include "../lv_font/lv_symbol_def.h"
#include "../lv_misc/lv_anim.h"
#include "../lv_misc/lv_math.h"
#include "../lv_misc/lv_txt_ap.h"
#include <string.h>
/*********************
* DEFINES
*********************/
#define LV_OBJX_NAME "lv_dropdown"
#if LV_USE_ANIMATION == 0
#undef LV_DROPDOWN_DEF_ANIM_TIME
#define LV_DROPDOWN_DEF_ANIM_TIME 0 /*No animation*/
#endif
#define LV_DROPDOWN_PR_NONE 0xFFFF
/**********************
* TYPEDEFS
**********************/
typedef struct
{
lv_page_ext_t page;
lv_obj_t *ddlist; /*Pointer to the ddlist where the page belongs*/
} lv_dropdown_page_ext_t;
/**********************
* STATIC PROTOTYPES
**********************/
static lv_design_res_t lv_dropdown_design(lv_obj_t *ddlist, const lv_area_t *clip_area, lv_design_mode_t mode);
static lv_design_res_t lv_dropdown_page_design(lv_obj_t *page, const lv_area_t *clip_area, lv_design_mode_t mode);
static lv_res_t lv_dropdown_signal(lv_obj_t *ddlist, lv_signal_t sign, void *param);
static lv_res_t lv_dropdown_page_signal(lv_obj_t *page, lv_signal_t sign, void *param);
static lv_res_t lv_dropdown_page_scrl_signal(lv_obj_t *scrl, lv_signal_t sign, void *param);
static lv_style_list_t *lv_dropdown_get_style(lv_obj_t *ddlist, uint8_t part);
static void draw_box(lv_obj_t *ddlist, const lv_area_t *clip_area, uint16_t id, lv_state_t state);
static void draw_box_label(lv_obj_t *ddlist, const lv_area_t *clip_area, uint16_t id, lv_state_t state);
static lv_res_t page_release_handler(lv_obj_t *page);
static void page_press_handler(lv_obj_t *page);
static uint16_t get_id_on_point(lv_obj_t *ddlist, lv_coord_t y);
static void position_to_selected(lv_obj_t *ddlist);
static lv_obj_t *get_label(const lv_obj_t *ddlist);
/**********************
* STATIC VARIABLES
**********************/
static lv_signal_cb_t ancestor_signal;
static lv_signal_cb_t ancestor_page_signal;
static lv_signal_cb_t ancestor_page_scrl_signal;
static lv_design_cb_t ancestor_design;
static lv_design_cb_t ancestor_page_design;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Create a drop down list objects
* @param par pointer to an object, it will be the parent of the new drop down list
* @param copy pointer to a drop down list object, if not NULL then the new object will be copied
* from it
* @return pointer to the created drop down list
*/
lv_obj_t *lv_dropdown_create(lv_obj_t *par, const lv_obj_t *copy)
{
LV_LOG_TRACE("drop down list create started");
/*Create the ancestor drop down list*/
lv_obj_t *ddlist = lv_obj_create(par, copy);
LV_ASSERT_MEM(ddlist);
if (ddlist == NULL) {
return NULL;
}
if (ancestor_signal == NULL) {
ancestor_signal = lv_obj_get_signal_cb(ddlist);
}
if (ancestor_design == NULL) {
ancestor_design = lv_obj_get_design_cb(ddlist);
}
/*Allocate the drop down list type specific extended data*/
lv_dropdown_ext_t *ext = lv_obj_allocate_ext_attr(ddlist, sizeof(lv_dropdown_ext_t));
LV_ASSERT_MEM(ext);
if (ext == NULL) {
lv_obj_del(ddlist);
return NULL;
}
/*Initialize the allocated 'ext' */
ext->page = NULL;
ext->options = NULL;
ext->symbol = LV_SYMBOL_DOWN;
ext->text = "Select";
ext->static_txt = 1;
ext->show_selected = 1;
ext->sel_opt_id = 0;
ext->sel_opt_id_orig = 0;
ext->pr_opt_id = LV_DROPDOWN_PR_NONE;
ext->option_cnt = 0;
ext->dir = LV_DROPDOWN_DIR_DOWN;
ext->max_height = (3 * lv_disp_get_ver_res(NULL)) / 4;
lv_style_list_init(&ext->style_page);
lv_style_list_init(&ext->style_scrlbar);
lv_style_list_init(&ext->style_selected);
/*The signal and design functions are not copied so set them here*/
lv_obj_set_signal_cb(ddlist, lv_dropdown_signal);
lv_obj_set_design_cb(ddlist, lv_dropdown_design);
/*Init the new drop down list drop down list*/
if (copy == NULL) {
lv_obj_set_width(ddlist, LV_DPX(150));
lv_dropdown_set_options_static(ddlist, "Option 1\nOption 2\nOption 3");
lv_theme_apply(ddlist, LV_THEME_DROPDOWN);
}
/*Copy an existing drop down list*/
else {
lv_dropdown_ext_t *copy_ext = lv_obj_get_ext_attr(copy);
if (copy_ext->static_txt == 0) {
lv_dropdown_set_options(ddlist, lv_dropdown_get_options(copy));
} else {
lv_dropdown_set_options_static(ddlist, lv_dropdown_get_options(copy));
}
ext->option_cnt = copy_ext->option_cnt;
ext->sel_opt_id = copy_ext->sel_opt_id;
ext->sel_opt_id_orig = copy_ext->sel_opt_id;
ext->symbol = copy_ext->symbol;
ext->max_height = copy_ext->max_height;
ext->text = copy_ext->text;
ext->dir = copy_ext->dir;
ext->show_selected = copy_ext->show_selected;
lv_style_list_copy(&ext->style_page, &copy_ext->style_page);
lv_style_list_copy(&ext->style_selected, &copy_ext->style_selected);
lv_style_list_copy(&ext->style_scrlbar, &copy_ext->style_scrlbar);
}
LV_LOG_INFO("drop down list created");
return ddlist;
}
/*=====================
* Setter functions
*====================*/
/**
* Set text of the ddlist (Displayed on the button if `show_selected = false`)
* @param ddlist pointer to a drop down list object
* @param txt the text as a string (Only it's pointer is saved)
*/
void lv_dropdown_set_text(lv_obj_t *ddlist, const char *txt)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->text == txt) {
return;
}
ext->text = txt;
lv_obj_invalidate(ddlist);
}
/**
* Clear any options in a drop down list. Static or dynamic.
* @param ddlist pointer to drop down list object
*/
void lv_dropdown_clear_options(lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->options == NULL) {
return;
}
if (ext->static_txt == 0) {
lv_mem_free(ext->options);
}
ext->options = NULL;
ext->static_txt = 0;
ext->option_cnt = 0;
lv_obj_invalidate(ddlist);
}
/**
* Set the options in a drop down list from a string
* @param ddlist pointer to drop down list object
* @param options a string with '\n' separated options. E.g. "One\nTwo\nThree"
* The options string can be destroyed after calling this function
*/
void lv_dropdown_set_options(lv_obj_t *ddlist, const char *options)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
LV_ASSERT_STR(options);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
/*Count the '\n'-s to determine the number of options*/
ext->option_cnt = 0;
uint32_t i;
for (i = 0; options[i] != '\0'; i++) {
if (options[i] == '\n') {
ext->option_cnt++;
}
}
ext->option_cnt++; /*Last option has no `\n`*/
ext->sel_opt_id = 0;
ext->sel_opt_id_orig = 0;
/*Allocate space for the new text*/
#if LV_USE_ARABIC_PERSIAN_CHARS == 0
size_t len = strlen(options) + 1;
#else
size_t len = _lv_txt_ap_calc_bytes_cnt(options) + 1;
#endif
if (ext->options != NULL && ext->static_txt == 0) {
lv_mem_free(ext->options);
ext->options = NULL;
}
ext->options = lv_mem_alloc(len);
LV_ASSERT_MEM(ext->options);
if (ext->options == NULL) {
return;
}
#if LV_USE_ARABIC_PERSIAN_CHARS == 0
strcpy(ext->options, options);
#else
_lv_txt_ap_proc(options, ext->options);
#endif
/*Now the text is dynamically allocated*/
ext->static_txt = 0;
}
/**
* Set the options in a drop down list from a string
* @param ddlist pointer to drop down list object
* @param options a static string with '\n' separated options. E.g. "One\nTwo\nThree"
*/
void lv_dropdown_set_options_static(lv_obj_t *ddlist, const char *options)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
LV_ASSERT_STR(options);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
/*Count the '\n'-s to determine the number of options*/
ext->option_cnt = 0;
uint32_t i;
for (i = 0; options[i] != '\0'; i++) {
if (options[i] == '\n') {
ext->option_cnt++;
}
}
ext->option_cnt++; /*Last option has no `\n`*/
ext->sel_opt_id = 0;
ext->sel_opt_id_orig = 0;
if (ext->static_txt == 0 && ext->options != NULL) {
lv_mem_free(ext->options);
ext->options = NULL;
}
ext->static_txt = 1;
ext->options = (char *)options;
}
/**
* Add an options to a drop down list from a string. Only works for dynamic options.
* @param ddlist pointer to drop down list object
* @param option a string without '\n'. E.g. "Four"
* @param pos the insert position, indexed from 0, LV_DROPDOWN_POS_LAST = end of string
*/
void lv_dropdown_add_option(lv_obj_t *ddlist, const char *option, uint32_t pos)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
LV_ASSERT_STR(option);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
/*Convert static options to dynamic*/
if (ext->static_txt != 0) {
char *static_options = ext->options;
size_t len = strlen(static_options) + 1;
ext->options = lv_mem_alloc(len);
LV_ASSERT_MEM(ext->options);
if (ext->options == NULL) {
return;
}
strcpy(ext->options, static_options);
ext->static_txt = 0;
}
/*Allocate space for the new option*/
size_t old_len = (ext->options == NULL) ? 0 : strlen(ext->options);
#if LV_USE_ARABIC_PERSIAN_CHARS == 0
size_t ins_len = strlen(option) + 1;
#else
size_t ins_len = _lv_txt_ap_calc_bytes_cnt(option) + 1;
#endif
size_t new_len = ins_len + old_len + 2; /* +2 for terminating NULL and possible \n */
ext->options = lv_mem_realloc(ext->options, new_len + 1);
LV_ASSERT_MEM(ext->options);
if (ext->options == NULL) {
return;
}
ext->options[old_len] = 0;
/*Find the insert character position*/
uint32_t insert_pos = old_len;
if (pos != LV_DROPDOWN_POS_LAST) {
uint32_t opcnt = 0;
for (insert_pos = 0; ext->options[insert_pos] != 0; insert_pos++) {
if (opcnt == pos) {
break;
}
if (ext->options[insert_pos] == '\n') {
opcnt++;
}
}
}
/*Add delimiter to existing options*/
if ((insert_pos > 0) && (pos >= ext->option_cnt)) {
_lv_txt_ins(ext->options, _lv_txt_encoded_get_char_id(ext->options, insert_pos++), "\n");
}
/*Insert the new option, adding \n if necessary*/
char *ins_buf = _lv_mem_buf_get(ins_len + 2); /* + 2 for terminating NULL and possible \n */
LV_ASSERT_MEM(ins_buf);
if (ins_buf == NULL) {
return;
}
#if LV_USE_ARABIC_PERSIAN_CHARS == 0
strcpy(ins_buf, option);
#else
_lv_txt_ap_proc(option, ins_buf);
#endif
if (pos < ext->option_cnt) {
strcat(ins_buf, "\n");
}
_lv_txt_ins(ext->options, _lv_txt_encoded_get_char_id(ext->options, insert_pos), ins_buf);
_lv_mem_buf_release(ins_buf);
ext->option_cnt++;
lv_obj_invalidate(ddlist);
}
/**
* Set the selected option
* @param ddlist pointer to drop down list object
* @param sel_opt id of the selected option (0 ... number of option - 1);
*/
void lv_dropdown_set_selected(lv_obj_t *ddlist, uint16_t sel_opt)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->sel_opt_id == sel_opt) {
return;
}
ext->sel_opt_id = sel_opt < ext->option_cnt ? sel_opt : ext->option_cnt - 1;
ext->sel_opt_id_orig = ext->sel_opt_id;
lv_obj_invalidate(ddlist);
}
/**
* Set the direction of the a drop down list
* @param ddlist pointer to a drop down list object
* @param dir LV_DROPDOWN_DIR_LEF/RIGHT/TOP/BOTTOM
*/
void lv_dropdown_set_dir(lv_obj_t *ddlist, lv_dropdown_dir_t dir)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->dir == dir) {
return;
}
ext->dir = dir;
lv_obj_invalidate(ddlist);
}
/**
* Set the maximal height for the drop down list
* @param ddlist pointer to a drop down list
* @param h the maximal height
*/
void lv_dropdown_set_max_height(lv_obj_t *ddlist, lv_coord_t h)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->max_height == h) {
return;
}
ext->max_height = h;
if (ext->page) {
if (h == 0) {
lv_cont_set_fit(ext->page, LV_FIT_TIGHT);
} else {
lv_cont_set_fit2(ext->page, LV_FIT_TIGHT, LV_FIT_NONE);
lv_obj_set_height(ext->page, h);
}
}
}
/**
* Set an arrow or other symbol to display when the drop-down list is closed.
* @param ddlist pointer to drop down list object
* @param symbol a text like `LV_SYMBOL_DOWN` or NULL to not draw icon
*/
void lv_dropdown_set_symbol(lv_obj_t *ddlist, const char *symbol)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
ext->symbol = symbol;
lv_obj_invalidate(ddlist);
}
/**
* Set whether the ddlist highlight the last selected option and display its text or not
* @param ddlist pointer to a drop down list object
* @param show true/false
*/
void lv_dropdown_set_show_selected(lv_obj_t *ddlist, bool show)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->show_selected == show) {
return;
}
ext->show_selected = show;
lv_obj_invalidate(ddlist);
}
/*=====================
* Getter functions
*====================*/
/**
* Get text of the ddlist (Displayed on the button if `show_selected = false`)
* @param ddlist pointer to a drop down list object
* @return the text string
*/
const char *lv_dropdown_get_text(lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->text;
}
/**
* Get the options of a drop down list
* @param ddlist pointer to drop down list object
* @return the options separated by '\n'-s (E.g. "Option1\nOption2\nOption3")
*/
const char *lv_dropdown_get_options(const lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->options;
}
/**
* Get the selected option
* @param ddlist pointer to drop down list object
* @return id of the selected option (0 ... number of option - 1);
*/
uint16_t lv_dropdown_get_selected(const lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->sel_opt_id;
}
/**
* Get the total number of options
* @param ddlist pointer to drop down list object
* @return the total number of options in the list
*/
uint16_t lv_dropdown_get_option_cnt(const lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->option_cnt;
}
/**
* 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_dropdown_get_selected_str(const lv_obj_t *ddlist, char *buf, uint32_t buf_size)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
uint32_t i;
uint32_t line = 0;
size_t txt_len = strlen(ext->options);
for (i = 0; i < txt_len && line != ext->sel_opt_id_orig; i++) {
if (ext->options[i] == '\n') {
line++;
}
}
uint32_t c;
for (c = 0; i < txt_len && ext->options[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] = ext->options[i];
}
buf[c] = '\0';
}
/**
* Get the fix height value.
* @param ddlist pointer to a drop down list object
* @return the height if the ddlist is opened (0: auto size)
*/
lv_coord_t lv_dropdown_get_max_height(const lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->max_height;
}
/**
* Get the symbol to draw when the drop-down list is closed
* @param ddlist pointer to drop down list object
* @return the symbol or NULL if not enabled
*/
const char *lv_dropdown_get_symbol(lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->symbol;
}
/**
* Get the direction of the drop down list
* @param ddlist pointer to a drop down list object
* @return LV_DROPDOWN_DIR_LEF/RIGHT/TOP/BOTTOM
*/
lv_dropdown_dir_t lv_dropdown_get_dir(const lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->dir;
}
/**
* Get whether the ddlist highlight the last selected option and display its text or not
* @param ddlist pointer to a drop down list object
* @return true/false
*/
bool lv_dropdown_get_show_selected(lv_obj_t *ddlist)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
return ext->show_selected ? true : false;
}
/*=====================
* Other functions
*====================*/
/**
* Open the drop down list with or without animation
* @param ddlist pointer to drop down list object
*/
void lv_dropdown_open(lv_obj_t *ddlist)
{
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->page) {
return;
}
ext->page = lv_page_create(lv_obj_get_screen(ddlist), NULL);
lv_obj_add_protect(ext->page, LV_PROTECT_POS | LV_PROTECT_CLICK_FOCUS);
lv_obj_add_protect(lv_page_get_scrollable(ext->page), LV_PROTECT_CLICK_FOCUS);
lv_obj_set_base_dir(ext->page, lv_obj_get_base_dir(ddlist));
if (ancestor_page_signal == NULL) {
ancestor_page_signal = lv_obj_get_signal_cb(ext->page);
}
if (ancestor_page_scrl_signal == NULL)
ancestor_page_scrl_signal = lv_obj_get_signal_cb(lv_page_get_scrollable(
ext->page));
if (ancestor_page_design == NULL) {
ancestor_page_design = lv_obj_get_design_cb(ext->page);
}
lv_dropdown_page_ext_t *page_ext = lv_obj_allocate_ext_attr(ext->page, sizeof(lv_dropdown_page_ext_t));
LV_ASSERT_MEM(page_ext);
if (page_ext == NULL) {
lv_obj_del(ext->page);
ext->page = NULL;
return;
}
page_ext->ddlist = ddlist;
lv_obj_set_design_cb(ext->page, lv_dropdown_page_design);
lv_obj_set_signal_cb(ext->page, lv_dropdown_page_signal);
lv_obj_set_signal_cb(lv_page_get_scrollable(ext->page), lv_dropdown_page_scrl_signal);
lv_style_list_copy(lv_obj_get_style_list(ext->page, LV_PAGE_PART_BG), &ext->style_page);
lv_style_list_copy(lv_obj_get_style_list(ext->page, LV_PAGE_PART_SCROLLBAR), &ext->style_scrlbar);
lv_obj_clean_style_list(ext->page, LV_PAGE_PART_SCROLLABLE);
lv_obj_refresh_style(ext->page, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
lv_obj_t *label = lv_label_create(ext->page, NULL);
lv_label_set_text_static(label, ext->options);
lv_cont_set_fit2(ext->page, LV_FIT_TIGHT, LV_FIT_NONE);
/*Set small width to the width of the button*/
if (lv_obj_get_width(ext->page) < lv_obj_get_width(ddlist) &&
(ext->dir == LV_DROPDOWN_DIR_UP || ext->dir == LV_DROPDOWN_DIR_DOWN)) {
lv_cont_set_fit2(ext->page, LV_FIT_NONE, LV_FIT_NONE);
lv_obj_set_width(ext->page, lv_obj_get_width(ddlist));
}
lv_coord_t label_h = lv_obj_get_height(label);
lv_style_int_t top = lv_obj_get_style_pad_top(ddlist, LV_DROPDOWN_PART_LIST);
lv_style_int_t bottom = lv_obj_get_style_pad_bottom(ddlist, LV_DROPDOWN_PART_LIST);
lv_coord_t list_fit_h = label_h + top + bottom;
lv_coord_t list_h = list_fit_h;
if (list_h > ext->max_height) {
list_h = ext->max_height;
}
lv_dropdown_dir_t dir = ext->dir;
/*No place on the bottom? See if top is better.*/
if (ext->dir == LV_DROPDOWN_DIR_DOWN) {
if (ddlist->coords.y2 + list_h > LV_VER_RES) {
if (ddlist->coords.y1 > LV_VER_RES - ddlist->coords.y2) {
/*There is more space on the top, so make it drop up*/
dir = LV_DROPDOWN_DIR_UP;
list_h = ddlist->coords.y1;
} else {
list_h = LV_VER_RES - ddlist->coords.y2;
}
}
}
/*No place on the top? See if bottom is better.*/
else if (ext->dir == LV_DROPDOWN_DIR_UP) {
if (ddlist->coords.y1 - list_h < 0) {
if (ddlist->coords.y1 < LV_VER_RES - ddlist->coords.y2) {
/*There is more space on the top, so make it drop up*/
dir = LV_DROPDOWN_DIR_DOWN;
list_h = LV_VER_RES - ddlist->coords.y2;
} else {
list_h = ddlist->coords.y1;
}
}
}
if (list_h > list_fit_h) {
list_h = list_fit_h;
}
if (list_h > ext->max_height) {
list_h = ext->max_height;
}
lv_obj_set_height(ext->page, list_h);
position_to_selected(ddlist);
if (dir == LV_DROPDOWN_DIR_DOWN) {
lv_obj_align(ext->page, ddlist, LV_ALIGN_OUT_BOTTOM_LEFT, 0, 0);
} else if (dir == LV_DROPDOWN_DIR_UP) {
lv_obj_align(ext->page, ddlist, LV_ALIGN_OUT_TOP_LEFT, 0, 0);
} else if (dir == LV_DROPDOWN_DIR_LEFT) {
lv_obj_align(ext->page, ddlist, LV_ALIGN_OUT_LEFT_TOP, 0, 0);
} else if (dir == LV_DROPDOWN_DIR_RIGHT) {
lv_obj_align(ext->page, ddlist, LV_ALIGN_OUT_RIGHT_TOP, 0, 0);
}
if (ext->dir == LV_DROPDOWN_DIR_LEFT || ext->dir == LV_DROPDOWN_DIR_RIGHT) {
if (ext->page->coords.y2 > LV_VER_RES) {
lv_obj_set_y(ext->page, lv_obj_get_y(ext->page) - (ext->page->coords.y2 - LV_VER_RES));
}
}
if (lv_label_get_align(label) == LV_LABEL_ALIGN_RIGHT) {
lv_obj_set_x(label, lv_obj_get_width_fit(ext->page) - lv_obj_get_width(label));
}
}
/**
* Close (Collapse) the drop down list
* @param ddlist pointer to drop down list object
*/
void lv_dropdown_close(lv_obj_t *ddlist)
{
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->page == NULL) {
return;
}
ext->pr_opt_id = LV_DROPDOWN_PR_NONE;
lv_obj_del(ext->page);
ext->page = NULL;
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the drop down list
* @param ddlist pointer to an object
* @param clip_area the object will be drawn only in this area
* @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
* (return 'true' if yes)
* LV_DESIGN_DRAW: draw the object (always return 'true')
* LV_DESIGN_DRAW_POST: drawing after every children are drawn
* @param return an element of `lv_design_res_t`
*/
static lv_design_res_t lv_dropdown_design(lv_obj_t *ddlist, const lv_area_t *clip_area, lv_design_mode_t mode)
{
/*Return false if the object is not covers the mask_p area*/
if (mode == LV_DESIGN_COVER_CHK) {
return ancestor_design(ddlist, clip_area, mode);
}
/*Draw the object*/
else if (mode == LV_DESIGN_DRAW_MAIN) {
ancestor_design(ddlist, clip_area, mode);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
lv_style_int_t left = lv_obj_get_style_pad_left(ddlist, LV_DROPDOWN_PART_MAIN);
lv_style_int_t right = lv_obj_get_style_pad_right(ddlist, LV_DROPDOWN_PART_MAIN);
lv_style_int_t top = lv_obj_get_style_pad_top(ddlist, LV_DROPDOWN_PART_MAIN);
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
lv_obj_init_draw_label_dsc(ddlist, LV_DROPDOWN_PART_MAIN, &label_dsc);
lv_area_t txt_area;
lv_point_t txt_size;
const char *opt_txt = ext->text;
if (ext->show_selected) {
char *buf = _lv_mem_buf_get(128);
lv_dropdown_get_selected_str(ddlist, buf, 128);
opt_txt = buf;
}
const char *txt;
bool rev = false;
if (ext->dir == LV_DROPDOWN_DIR_LEFT) {
rev = true;
}
if (lv_obj_get_base_dir(ddlist) == LV_BIDI_DIR_RTL) {
rev = true;
}
txt = rev ? ext->symbol : opt_txt;
if (txt) {
_lv_txt_get_size(&txt_size, txt, label_dsc.font, label_dsc.letter_space, label_dsc.line_space, LV_COORD_MAX,
label_dsc.flag);
txt_area.y1 = ddlist->coords.y1 + top;
txt_area.y2 = txt_area.y1 + txt_size.y;
/*Center align the text if no symbol*/
if (ext->symbol == NULL && txt == opt_txt) {
txt_area.x1 = ddlist->coords.x1 + (lv_obj_get_width(ddlist) - txt_size.x) / 2;
txt_area.x2 = txt_area.x1 + txt_size.x;
} else {
txt_area.x1 = ddlist->coords.x1 + left;
txt_area.x2 = txt_area.x1 + txt_size.x;
}
lv_draw_label(&txt_area, clip_area, &label_dsc, txt, NULL);
}
txt = rev ? opt_txt : ext->symbol;
if (txt) {
_lv_txt_get_size(&txt_size, txt, label_dsc.font, label_dsc.letter_space, label_dsc.line_space, LV_COORD_MAX,
label_dsc.flag);
txt_area.y1 = ddlist->coords.y1 + top;
txt_area.y2 = txt_area.y1 + txt_size.y;
/*Center align the text if no symbol*/
if (ext->symbol == NULL && txt == opt_txt) {
txt_area.x1 = ddlist->coords.x1 + (lv_obj_get_width(ddlist) - txt_size.x) / 2;
txt_area.x2 = txt_area.x1 + txt_size.x;
} else {
txt_area.x1 = ddlist->coords.x2 - right - txt_size.x;
txt_area.x2 = txt_area.x1 + txt_size.x;
}
lv_draw_label(&txt_area, clip_area, &label_dsc, txt, NULL);
}
if (ext->show_selected) {
_lv_mem_buf_release((char *)opt_txt);
}
} else if (mode == LV_DESIGN_DRAW_POST) {
ancestor_design(ddlist, clip_area, mode);
}
return LV_DESIGN_RES_OK;
}
/**
* Handle the drawing related tasks of the drop down list's page
* @param page pointer to an object
* @param clip_area the object will be drawn only in this area
* @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
* (return 'true' if yes)
* LV_DESIGN_DRAW: draw the object (always return 'true')
* LV_DESIGN_DRAW_POST: drawing after every children are drawn
* @param return an element of `lv_design_res_t`
*/
static lv_design_res_t lv_dropdown_page_design(lv_obj_t *page, const lv_area_t *clip_area, lv_design_mode_t mode)
{
/*Return false if the object is not covers the mask_p area*/
if (mode == LV_DESIGN_COVER_CHK) {
return ancestor_page_design(page, clip_area, mode);
}
/*Draw the object*/
else if (mode == LV_DESIGN_DRAW_MAIN) {
ancestor_page_design(page, clip_area, mode);
lv_dropdown_page_ext_t *page_ext = lv_obj_get_ext_attr(page);
lv_obj_t *ddlist = page_ext->ddlist;
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
/*Draw the boxes if the page is not being deleted*/
if (ext->page) {
/* Clip area might be too large too to shadow but
* the selected option can be drawn on only the background*/
lv_area_t clip_area_core;
bool has_common;
has_common = _lv_area_intersect(&clip_area_core, clip_area, &ext->page->coords);
if (has_common) {
if (ext->pr_opt_id != LV_DROPDOWN_PR_NONE) {
draw_box(ddlist, &clip_area_core, ext->pr_opt_id, LV_STATE_PRESSED);
}
draw_box(ddlist, &clip_area_core, ext->sel_opt_id, LV_STATE_DEFAULT);
}
}
}
/*Post draw when the children are drawn*/
else if (mode == LV_DESIGN_DRAW_POST) {
/*Draw the scrollbar in the ancestor page design function*/
ancestor_page_design(page, clip_area, mode);
/*Redraw the text on the selected area with a different color*/
lv_dropdown_page_ext_t *page_ext = lv_obj_get_ext_attr(page);
lv_obj_t *ddlist = page_ext->ddlist;
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
/*Draw the box labels if the page is not being deleted*/
if (ext->page) {
/* Clip area might be too large too to shadow but
* the selected option can be drawn on only the background*/
lv_area_t clip_area_core;
bool has_common;
has_common = _lv_area_intersect(&clip_area_core, clip_area, &ext->page->coords);
if (has_common) {
if (ext->pr_opt_id != LV_DROPDOWN_PR_NONE) {
draw_box_label(ddlist, &clip_area_core, ext->pr_opt_id, LV_STATE_PRESSED);
}
draw_box_label(ddlist, &clip_area_core, ext->sel_opt_id, LV_STATE_DEFAULT);
}
}
}
return LV_DESIGN_RES_OK;
}
/**
* Signal function of the drop down list
* @param ddlist pointer to a drop down list 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_dropdown_signal(lv_obj_t *ddlist, lv_signal_t sign, void *param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_signal(ddlist, sign, param);
if (res != LV_RES_OK) {
return res;
}
if (sign == LV_SIGNAL_GET_TYPE) {
return lv_obj_handle_get_type_signal(param, LV_OBJX_NAME);
}
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (sign == LV_SIGNAL_GET_STYLE) {
lv_get_style_info_t *info = param;
info->result = lv_dropdown_get_style(ddlist, info->part);
if (info->result != NULL) {
return LV_RES_OK;
}
return LV_RES_OK;
} else if (sign == LV_SIGNAL_GET_STATE_DSC) {
lv_get_state_info_t *info = param;
if (info->part == LV_DROPDOWN_PART_LIST ||
info->part == LV_DROPDOWN_PART_SCROLLBAR ||
info->part == LV_DROPDOWN_PART_SELECTED) {
info->result = lv_obj_get_state(ext->page, LV_PAGE_PART_BG);
}
} else if (sign == LV_SIGNAL_CLEANUP) {
lv_dropdown_close(ddlist);
if (ext->static_txt == 0) {
lv_mem_free(ext->options);
ext->options = NULL;
}
/*`lv_obj_clean_style_list` is not required because these styles are only copied to the page
* so they can have transitions or other object related things. */
_lv_style_list_reset(&ext->style_page);
_lv_style_list_reset(&ext->style_scrlbar);
_lv_style_list_reset(&ext->style_selected);
} else if (sign == LV_SIGNAL_FOCUS) {
#if LV_USE_GROUP
lv_group_t *g = lv_obj_get_group(ddlist);
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) {
/*Open the list if editing*/
if (editing) {
lv_dropdown_open(ddlist);
}
/*Close the list if navigating*/
else {
lv_dropdown_close(ddlist);
}
}
#endif
} else if (sign == LV_SIGNAL_DEFOCUS || sign == LV_SIGNAL_LEAVE) {
lv_dropdown_close(ddlist);
} else if (sign == LV_SIGNAL_RELEASED) {
lv_indev_t *indev = lv_indev_get_act();
if (lv_indev_is_dragging(indev) == false) {
if (ext->page) {
lv_dropdown_close(ddlist);
if (ext->sel_opt_id_orig != ext->sel_opt_id) {
ext->sel_opt_id_orig = ext->sel_opt_id;
uint32_t id = ext->sel_opt_id; /*Just to use uint32_t in event data*/
res = lv_event_send(ddlist, LV_EVENT_VALUE_CHANGED, &id);
if (res != LV_RES_OK) {
return res;
}
lv_obj_invalidate(ddlist);
}
#if LV_USE_GROUP
lv_indev_type_t indev_type = lv_indev_get_type(indev);
if (indev_type == LV_INDEV_TYPE_ENCODER) {
lv_group_set_editing(lv_obj_get_group(ddlist), false);
}
#endif
} else {
lv_dropdown_open(ddlist);
}
} else {
ext->sel_opt_id = ext->sel_opt_id_orig;
lv_obj_invalidate(ddlist);
}
} else if (sign == LV_SIGNAL_COORD_CHG) {
if (ext->page) {
lv_dropdown_close(ddlist);
}
} else if (sign == LV_SIGNAL_STYLE_CHG) {
lv_style_int_t top = lv_obj_get_style_pad_top(ddlist, LV_DROPDOWN_PART_MAIN);
lv_style_int_t bottom = lv_obj_get_style_pad_bottom(ddlist, LV_DROPDOWN_PART_MAIN);
const lv_font_t *font = lv_obj_get_style_text_font(ddlist, LV_DROPDOWN_PART_MAIN);
lv_obj_set_height(ddlist, top + bottom + lv_font_get_line_height(font));
if (ext->page) {
lv_obj_refresh_style(ext->page, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
}
} else if (sign == LV_SIGNAL_CONTROL) {
#if LV_USE_GROUP
char c = *((char *)param);
if (c == LV_KEY_RIGHT || c == LV_KEY_DOWN) {
if (ext->page == NULL) {
lv_dropdown_open(ddlist);
} else if (ext->sel_opt_id + 1 < ext->option_cnt) {
ext->sel_opt_id++;
position_to_selected(ddlist);
}
} else if (c == LV_KEY_LEFT || c == LV_KEY_UP) {
if (ext->page == NULL) {
lv_dropdown_open(ddlist);
} else if (ext->sel_opt_id > 0) {
ext->sel_opt_id--;
position_to_selected(ddlist);
}
} else if (c == LV_KEY_ESC) {
ext->sel_opt_id = ext->sel_opt_id_orig;
lv_dropdown_close(ddlist);
}
#endif
} else if (sign == LV_SIGNAL_GET_EDITABLE) {
#if LV_USE_GROUP
bool *editable = (bool *)param;
*editable = true;
#endif
}
return res;
}
/**
* Signal function of the drop down list's scrollable part
* @param scrl pointer to a drop down list's scrollable part
* @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_dropdown_page_signal(lv_obj_t *page, lv_signal_t sign, void *param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_page_signal(page, sign, param);
if (res != LV_RES_OK) {
return res;
}
if (sign == LV_SIGNAL_GET_TYPE) {
return lv_obj_handle_get_type_signal(param, "");
}
lv_dropdown_page_ext_t *page_ext = lv_obj_get_ext_attr(page);
lv_obj_t *ddlist = page_ext->ddlist;
if (sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
/* Make possible to draw on the full width of the background to redraw the selected rectangle
* when the ddlist is scrolled in fix height mode.
* (The scrollable is scrolled then "select rectangle" is drawn on the bg too)*/
lv_style_int_t left = lv_obj_get_style_pad_left(ddlist, LV_DROPDOWN_PART_LIST);
lv_style_int_t right = lv_obj_get_style_pad_right(ddlist, LV_DROPDOWN_PART_LIST);
lv_obj_t *scrl = lv_page_get_scrollable(page);
scrl->ext_draw_pad = LV_MATH_MAX3(scrl->ext_draw_pad, left, right);
} else if (sign == LV_SIGNAL_RELEASED) {
if (lv_indev_is_dragging(lv_indev_get_act()) == false) {
page_release_handler(page);
}
} else if (sign == LV_SIGNAL_PRESSED) {
page_press_handler(page);
} else if (sign == LV_SIGNAL_CLEANUP) {
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
ext->page = NULL; /*The page is just being deleted*/
}
return res;
}
/**
* Signal function of the drop down list's scrollable part
* @param scrl pointer to a drop down list's scrollable part
* @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_dropdown_page_scrl_signal(lv_obj_t *scrl, lv_signal_t sign, void *param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_page_scrl_signal(scrl, sign, param);
if (res != LV_RES_OK) {
return res;
}
if (sign == LV_SIGNAL_GET_TYPE) {
return lv_obj_handle_get_type_signal(param, "");
}
lv_obj_t *page = lv_obj_get_parent(scrl);
lv_dropdown_page_ext_t *page_ext = lv_obj_get_ext_attr(page);
lv_obj_t *ddlist = page_ext->ddlist;
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (sign == LV_SIGNAL_RELEASED) {
if (lv_indev_is_dragging(lv_indev_get_act()) == false) {
page_release_handler(page);
}
} else if (sign == LV_SIGNAL_PRESSED) {
page_press_handler(page);
} else if (sign == LV_SIGNAL_DRAG_BEGIN) {
ext->pr_opt_id = LV_DROPDOWN_PR_NONE;
lv_obj_invalidate(page);
} else if (sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
/* Make possible to draw on the full width of the background to redraw the selected rectangle
* when the ddlist is scrolled in fix height mode.
* (The scrollable is scrolled then "select rectangle" is drawn on the bg too)*/
lv_style_int_t left = lv_obj_get_style_pad_left(ddlist, LV_DROPDOWN_PART_LIST);
lv_style_int_t right = lv_obj_get_style_pad_right(ddlist, LV_DROPDOWN_PART_LIST);
scrl->ext_draw_pad = LV_MATH_MAX3(scrl->ext_draw_pad, left, right);
}
return res;
}
/**
* Get the style descriptor of a part of the object
* @param page pointer the object
* @param part the part from `lv_dropdown_part_t`. (LV_DROPDOWN_PART_...)
* @return pointer to the style descriptor of the specified part
*/
static lv_style_list_t *lv_dropdown_get_style(lv_obj_t *ddlist, uint8_t part)
{
LV_ASSERT_OBJ(ddlist, LV_OBJX_NAME);
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
lv_style_list_t *style_dsc_p;
switch (part) {
case LV_DROPDOWN_PART_MAIN:
style_dsc_p = &ddlist->style_list;
break;
case LV_DROPDOWN_PART_LIST:
style_dsc_p = &ext->style_page;
break;
case LV_DROPDOWN_PART_SCROLLBAR:
style_dsc_p = &ext->style_scrlbar;
break;
case LV_DROPDOWN_PART_SELECTED:
style_dsc_p = &ext->style_selected;
break;
default:
style_dsc_p = NULL;
}
return style_dsc_p;
}
static void draw_box(lv_obj_t *ddlist, const lv_area_t *clip_area, uint16_t id, lv_state_t state)
{
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
lv_obj_t *page = ext->page;
lv_state_t state_orig = page->state;
if (state != page->state) {
_lv_obj_disable_style_caching(ddlist, true);
page->state = state;
}
/*Draw a rectangle under the selected item*/
const lv_font_t *font = lv_obj_get_style_text_font(ddlist, LV_DROPDOWN_PART_LIST);
lv_style_int_t line_space = lv_obj_get_style_text_line_space(ddlist, LV_DROPDOWN_PART_LIST);
lv_coord_t font_h = lv_font_get_line_height(font);
/*Draw the selected*/
lv_obj_t *label = get_label(ddlist);
lv_area_t rect_area;
rect_area.y1 = label->coords.y1;
rect_area.y1 += id * (font_h + line_space);
rect_area.y1 -= line_space / 2;
rect_area.y2 = rect_area.y1 + font_h + line_space - 1;
rect_area.x1 = ext->page->coords.x1;
rect_area.x2 = ext->page->coords.x2;
lv_draw_rect_dsc_t sel_rect;
lv_draw_rect_dsc_init(&sel_rect);
lv_obj_init_draw_rect_dsc(ddlist, LV_DROPDOWN_PART_SELECTED, &sel_rect);
lv_draw_rect(&rect_area, clip_area, &sel_rect);
page->state = state_orig;
_lv_obj_disable_style_caching(ddlist, false);
}
static void draw_box_label(lv_obj_t *ddlist, const lv_area_t *clip_area, uint16_t id, lv_state_t state)
{
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
lv_obj_t *page = ext->page;
lv_state_t state_orig = page->state;
if (state != page->state) {
page->state = state;
_lv_obj_disable_style_caching(ddlist, true);
}
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
lv_obj_init_draw_label_dsc(ddlist, LV_DROPDOWN_PART_SELECTED, &label_dsc);
label_dsc.line_space = lv_obj_get_style_text_line_space(ddlist,
LV_DROPDOWN_PART_LIST); /*Line space should come from the page*/
lv_obj_t *label = get_label(ddlist);
if (label == NULL) {
return;
}
lv_label_align_t align = lv_label_get_align(label);
if (align == LV_LABEL_ALIGN_CENTER) {
label_dsc.flag |= LV_TXT_FLAG_CENTER;
} else if (align == LV_LABEL_ALIGN_RIGHT) {
label_dsc.flag |= LV_TXT_FLAG_RIGHT;
}
lv_coord_t font_h = lv_font_get_line_height(label_dsc.font);
lv_area_t area_sel;
area_sel.y1 = label->coords.y1;
area_sel.y1 += id * (font_h + label_dsc.line_space);
area_sel.y1 -= label_dsc.line_space / 2;
area_sel.y2 = area_sel.y1 + font_h + label_dsc.line_space - 1;
area_sel.x1 = page->coords.x1;
area_sel.x2 = page->coords.x2;
lv_area_t mask_sel;
bool area_ok;
area_ok = _lv_area_intersect(&mask_sel, clip_area, &area_sel);
if (area_ok) {
lv_draw_label(&label->coords, &mask_sel, &label_dsc, lv_label_get_text(label), NULL);
}
page->state = state_orig;
_lv_obj_disable_style_caching(ddlist, false);
}
/**
* Called when a drop down list is released to open it or set new option
* @param page pointer to the drop down list's page
* @return LV_RES_INV if the page is not being deleted in the user callback. Else LV_RES_OK
*/
static lv_res_t page_release_handler(lv_obj_t *page)
{
lv_dropdown_page_ext_t *page_ext = lv_obj_get_ext_attr(page);
lv_obj_t *ddlist = page_ext->ddlist;
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
lv_indev_t *indev = lv_indev_get_act();
#if LV_USE_GROUP
/*Leave edit mode once a new item is selected*/
if (lv_indev_get_type(indev) == LV_INDEV_TYPE_ENCODER) {
ext->sel_opt_id_orig = ext->sel_opt_id;
lv_group_t *g = lv_obj_get_group(ddlist);
if (lv_group_get_editing(g)) {
lv_group_set_editing(g, false);
}
}
#endif
/*Search the clicked option (For KEYPAD and ENCODER the new value should be already set)*/
if (lv_indev_get_type(indev) == LV_INDEV_TYPE_POINTER || lv_indev_get_type(indev) == LV_INDEV_TYPE_BUTTON) {
lv_point_t p;
lv_indev_get_point(indev, &p);
ext->sel_opt_id = get_id_on_point(ddlist, p.y);
ext->sel_opt_id_orig = ext->sel_opt_id;
}
lv_dropdown_close(ddlist);
/*Invalidate to refresh the text*/
if (ext->show_selected) {
lv_obj_invalidate(ddlist);
}
uint32_t id = ext->sel_opt_id; /*Just to use uint32_t in event data*/
lv_res_t res = lv_event_send(ddlist, LV_EVENT_VALUE_CHANGED, &id);
if (res != LV_RES_OK) {
return res;
}
if (ext->page == NULL) {
return LV_RES_INV;
}
return LV_RES_OK;
}
static void page_press_handler(lv_obj_t *page)
{
lv_dropdown_page_ext_t *page_ext = lv_obj_get_ext_attr(page);
lv_obj_t *ddlist = page_ext->ddlist;
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
lv_indev_t *indev = lv_indev_get_act();
if (indev && (lv_indev_get_type(indev) == LV_INDEV_TYPE_POINTER || lv_indev_get_type(indev) == LV_INDEV_TYPE_BUTTON)) {
lv_point_t p;
lv_indev_get_point(indev, &p);
ext->pr_opt_id = get_id_on_point(ddlist, p.y);
lv_obj_invalidate(page);
}
}
static uint16_t get_id_on_point(lv_obj_t *ddlist, lv_coord_t y)
{
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
lv_obj_t *label = get_label(ddlist);
if (label == NULL) {
return 0;
}
y -= label->coords.y1;
const lv_font_t *font = lv_obj_get_style_text_font(label, LV_LABEL_PART_MAIN);
lv_coord_t font_h = lv_font_get_line_height(font);
lv_style_int_t line_space = lv_obj_get_style_text_line_space(label, LV_LABEL_PART_MAIN);
y += line_space / 2;
lv_coord_t h = font_h + line_space;
uint16_t opt = y / h;
if (opt >= ext->option_cnt) {
opt = ext->option_cnt - 1;
}
return opt;
}
/**
* Set the position of list when it is closed to show the selected item
* @param ddlist pointer to a drop down list
*/
static void position_to_selected(lv_obj_t *ddlist)
{
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
const lv_font_t *font = lv_obj_get_style_text_font(ddlist, LV_DROPDOWN_PART_LIST);
lv_coord_t font_h = lv_font_get_line_height(font);
lv_obj_t *scrl = lv_page_get_scrollable(ext->page);
lv_obj_t *label = get_label(ddlist);
if (label == NULL) {
return;
}
lv_coord_t h = lv_obj_get_height(ext->page);
lv_style_int_t line_space = lv_obj_get_style_text_line_space(ddlist, LV_DROPDOWN_PART_LIST);
lv_coord_t line_y1 = ext->sel_opt_id * (font_h + line_space) + label->coords.y1 - scrl->coords.y1;
lv_obj_set_y(scrl, -line_y1 + (h - font_h) / 2);
lv_obj_invalidate(ext->page);
}
static lv_obj_t *get_label(const lv_obj_t *ddlist)
{
lv_dropdown_ext_t *ext = lv_obj_get_ext_attr(ddlist);
if (ext->page == NULL) {
return NULL;
}
return lv_obj_get_child(lv_page_get_scrollable(ext->page), NULL);
}
#endif
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