File Explorer

lv_file_explorer provides an API to browse the contents of the file system. lv_file_explorer only provides the file browsing function, but does not provide the actual file operation function. In other words, you can't click a picture file to open and view the picture like a PC. lv_file_explorer will tell you the full path and name of the currently clicked file. The file operation function needs to be implemented by the user.

The file list in lv_file_explorer is based on Table (lv_table), and the quick access bar is based on List (lv_list). Therefore, care should be taken to ensure that Table (lv_table) and List (lv_list) are enabled.

Usage

Enable LV_USE_FILE_EXPLORER in lv_conf.h.

First use lv_file_explorer_create(lv_screen_active()) to create a file explorer, The default size is the screen size. After that, you can customize the style like widget.

Quick access

The quick access bar is optional. You can turn off LV_FILE_EXPLORER_QUICK_ACCESS in lv_conf.h so that the quick access bar will not be created. This can save some memory, but not much. After the quick access bar is created, it can be hidden by clicking the button at the top left corner of the browsing area, which is very useful for small screen devices.

You can use lv_file_explorer_set_quick_access_path(file_explorer, LV_FILE_EXPLORER_QA_XX, "path") to set the path of the quick access bar. The items of the quick access bar are fixed. Currently, there are the following items:

• LV_FILE_EXPLORER_QA_HOME

• LV_FILE_EXPLORER_QA_MUSIC

• LV_FILE_EXPLORER_QA_PICTURES

• LV_FILE_EXPLORER_QA_VIDEO

• LV_FILE_EXPLORER_QA_DOCS

• LV_FILE_EXPLORER_QA_MNT

• LV_FILE_EXPLORER_QA_FS

Sort

You can use lv_file_explorer_set_sort(file_explorer, LV_EXPLORER_SORT_XX) to set sorting method.

There are the following sorting methods:

• LV_EXPLORER_SORT_NONE

• LV_EXPLORER_SORT_KIND

You can customize the sorting. Before custom sort, please set the default sorting to LV_EXPLORER_SORT_NONE. The default is LV_EXPLORER_SORT_NONE.

Events

• LV_EVENT_READY Sent when a directory is opened. You can customize the sort.

• LV_EVENT_VALUE_CHANGED Sent when an item (file) in the file list is clicked.

You can use lv_file_explorer_get_cur_path() to get the current path and lv_file_explorer_get_sel_fn() to get the name of the currently selected file in the event processing function. For example:

static void file_explorer_event_handler(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_VALUE_CHANGED) {
        char * cur_path =  lv_file_explorer_get_cur_path(widget);
        char * sel_fn = lv_file_explorer_get_sel_fn(widget);
        LV_LOG_USER("%s%s", cur_path, sel_fn);
    }
}

You can also save the obtained path and file name into an array through functions such as strcpy() and strcat() for later use.

Example

Simple File Explorer

C code  

 View on GitHub

#include "../../lv_examples.h"

#if LV_USE_TABLE && LV_USE_FILE_EXPLORER && (LV_USE_FS_STDIO || LV_USE_FS_POSIX || LV_USE_FS_WIN32 || LV_USE_FS_FATFS) && LV_BUILD_EXAMPLES

#include <stdlib.h>
#include <string.h>

static void file_explorer_event_handler(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_VALUE_CHANGED) {
        const char * cur_path =  lv_file_explorer_get_current_path(obj);
        const char * sel_fn = lv_file_explorer_get_selected_file_name(obj);
        LV_LOG_USER("%s%s", cur_path, sel_fn);
    }
}

void lv_example_file_explorer_1(void)
{
    lv_obj_t * file_explorer = lv_file_explorer_create(lv_screen_active());
    lv_file_explorer_set_sort(file_explorer, LV_EXPLORER_SORT_KIND);

#if LV_USE_FS_WIN32
    lv_file_explorer_open_dir(file_explorer, "D:");
#if LV_FILE_EXPLORER_QUICK_ACCESS
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_HOME_DIR, "C:/Users/Public/Desktop");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_VIDEO_DIR, "C:/Users/Public/Videos");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_PICTURES_DIR, "C:/Users/Public/Pictures");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_MUSIC_DIR, "C:/Users/Public/Music");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_DOCS_DIR, "C:/Users/Public/Documents");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_FS_DIR, "D:");
#endif

#else
    /* linux */
    lv_file_explorer_open_dir(file_explorer, "A:/");

#if LV_FILE_EXPLORER_QUICK_ACCESS
    char * envvar = "HOME";
    char home_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(home_dir, "A:");
    /* get the user's home directory from the HOME environment variable*/
    strcat(home_dir, getenv(envvar));
    LV_LOG_USER("home_dir: %s\n", home_dir);
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_HOME_DIR, home_dir);
    char video_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(video_dir, home_dir);
    strcat(video_dir, "/Videos");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_VIDEO_DIR, video_dir);
    char picture_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(picture_dir, home_dir);
    strcat(picture_dir, "/Pictures");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_PICTURES_DIR, picture_dir);
    char music_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(music_dir, home_dir);
    strcat(music_dir, "/Music");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_MUSIC_DIR, music_dir);
    char document_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(document_dir, home_dir);
    strcat(document_dir, "/Documents");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_DOCS_DIR, document_dir);

    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_FS_DIR, "A:/");
#endif
#endif

    lv_obj_add_event_cb(file_explorer, file_explorer_event_handler, LV_EVENT_ALL, NULL);
}

#endif

---

Control File Explorer

C code  

 View on GitHub

#include "../../lv_examples.h"

#if LV_USE_TABLE && LV_USE_DROPDOWN && LV_USE_FILE_EXPLORER && (LV_USE_FS_STDIO || LV_USE_FS_POSIX || LV_USE_FS_WIN32 || LV_USE_FS_FATFS) && LV_BUILD_EXAMPLES

#include <stdlib.h>
#include <string.h>

static void file_explorer_event_handler(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_VALUE_CHANGED) {
        const char * cur_path =  lv_file_explorer_get_current_path(obj);
        const char * sel_fn = lv_file_explorer_get_selected_file_name(obj);

        LV_LOG_USER("%s%s", cur_path, sel_fn);
    }
}

#if LV_FILE_EXPLORER_QUICK_ACCESS
static void btn_event_handler(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t * btn = lv_event_get_target(e);
    lv_obj_t * file_explorer = lv_event_get_user_data(e);

    if(code == LV_EVENT_VALUE_CHANGED) {
        if(lv_obj_has_state(btn, LV_STATE_CHECKED))
            lv_obj_add_flag(file_explorer, LV_OBJ_FLAG_HIDDEN);
        else
            lv_obj_remove_flag(file_explorer, LV_OBJ_FLAG_HIDDEN);
    }
}

static void dd_event_handler(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t * dd = lv_event_get_target(e);
    lv_obj_t * fe_quick_access_obj = lv_event_get_user_data(e);

    if(code == LV_EVENT_VALUE_CHANGED) {
        char buf[32];
        lv_dropdown_get_selected_str(dd, buf, sizeof(buf));
        if(strcmp(buf, "NONE") == 0) {
            lv_file_explorer_set_sort(fe_quick_access_obj, LV_EXPLORER_SORT_NONE);
        }
        else if(strcmp(buf, "KIND") == 0) {
            lv_file_explorer_set_sort(fe_quick_access_obj, LV_EXPLORER_SORT_KIND);
        }
    }
}
#endif

void lv_example_file_explorer_2(void)
{
    lv_obj_t * file_explorer = lv_file_explorer_create(lv_screen_active());

#if LV_USE_FS_WIN32
    lv_file_explorer_open_dir(file_explorer, "D:");
#if LV_FILE_EXPLORER_QUICK_ACCESS
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_HOME_DIR, "C:/Users/Public/Desktop");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_VIDEO_DIR, "C:/Users/Public/Videos");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_PICTURES_DIR, "C:/Users/Public/Pictures");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_MUSIC_DIR, "C:/Users/Public/Music");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_DOCS_DIR, "C:/Users/Public/Documents");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_FS_DIR, "D:");
#endif

#else
    /* linux */
    lv_file_explorer_open_dir(file_explorer, "A:/");
#if LV_FILE_EXPLORER_QUICK_ACCESS
    char * envvar = "HOME";
    char home_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(home_dir, "A:");
    /* get the user's home directory from the HOME environment variable*/
    strcat(home_dir, getenv(envvar));
    LV_LOG_USER("home_dir: %s\n", home_dir);
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_HOME_DIR, home_dir);
    char video_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(video_dir, home_dir);
    strcat(video_dir, "/Videos");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_VIDEO_DIR, video_dir);
    char picture_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(picture_dir, home_dir);
    strcat(picture_dir, "/Pictures");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_PICTURES_DIR, picture_dir);
    char music_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(music_dir, home_dir);
    strcat(music_dir, "/Music");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_MUSIC_DIR, music_dir);
    char document_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(document_dir, home_dir);
    strcat(document_dir, "/Documents");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_DOCS_DIR, document_dir);

    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_FS_DIR, "A:/");
#endif
#endif

    lv_obj_add_event_cb(file_explorer, file_explorer_event_handler, LV_EVENT_ALL, NULL);

#if LV_FILE_EXPLORER_QUICK_ACCESS
    /*Quick access status control button*/
    lv_obj_t * fe_quick_access_obj = lv_file_explorer_get_quick_access_area(file_explorer);
    lv_obj_t * fe_header_obj = lv_file_explorer_get_header(file_explorer);
    lv_obj_t * btn = lv_button_create(fe_header_obj);
    lv_obj_set_style_radius(btn, 2, 0);
    lv_obj_set_style_pad_all(btn, 4, 0);
    lv_obj_align(btn, LV_ALIGN_LEFT_MID, 0, 0);
    lv_obj_add_flag(btn, LV_OBJ_FLAG_CHECKABLE);

    lv_obj_t * label = lv_label_create(btn);
    lv_label_set_text(label, LV_SYMBOL_LIST);
    lv_obj_center(label);

    lv_obj_add_event_cb(btn, btn_event_handler, LV_EVENT_VALUE_CHANGED, fe_quick_access_obj);

    /*Sort control*/
    static const char * opts = "NONE\n"
                               "KIND";

    lv_obj_t * dd = lv_dropdown_create(fe_header_obj);
    lv_obj_set_style_radius(dd, 4, 0);
    lv_obj_set_style_pad_all(dd, 0, 0);
    lv_obj_set_size(dd, LV_PCT(30), LV_SIZE_CONTENT);
    lv_dropdown_set_options_static(dd, opts);
    lv_obj_align(dd, LV_ALIGN_RIGHT_MID, 0, 0);

    lv_obj_add_event_cb(dd, dd_event_handler, LV_EVENT_VALUE_CHANGED, file_explorer);
#endif
}

#endif

---

Custom sort

C code  

 View on GitHub

#include "../../lv_examples.h"

#if LV_USE_TABLE && LV_USE_FILE_EXPLORER && (LV_USE_FS_STDIO || LV_USE_FS_POSIX || LV_USE_FS_WIN32 || LV_USE_FS_FATFS) && LV_BUILD_EXAMPLES

#include <stdlib.h>
#include <string.h>

static void exch_table_item(lv_obj_t * tb, int16_t i, int16_t j)
{
    const char * tmp;
    tmp = lv_table_get_cell_value(tb, i, 0);
    lv_table_set_cell_value(tb, 0, 2, tmp);
    lv_table_set_cell_value(tb, i, 0, lv_table_get_cell_value(tb, j, 0));
    lv_table_set_cell_value(tb, j, 0, lv_table_get_cell_value(tb, 0, 2));

    tmp = lv_table_get_cell_value(tb, i, 1);
    lv_table_set_cell_value(tb, 0, 2, tmp);
    lv_table_set_cell_value(tb, i, 1, lv_table_get_cell_value(tb, j, 1));
    lv_table_set_cell_value(tb, j, 1, lv_table_get_cell_value(tb, 0, 2));
}

/*Quick sort 3 way*/
static void sort_by_file_kind(lv_obj_t * tb, int16_t lo, int16_t hi)
{
    if(lo >= hi) return;

    int16_t lt = lo;
    int16_t i = lo + 1;
    int16_t gt = hi;
    const char * v = lv_table_get_cell_value(tb, lo, 1);
    while(i <= gt) {
        if(strcmp(lv_table_get_cell_value(tb, i, 1), v) < 0)
            exch_table_item(tb, lt++, i++);
        else if(strcmp(lv_table_get_cell_value(tb, i, 1), v) > 0)
            exch_table_item(tb, i, gt--);
        else
            i++;
    }

    sort_by_file_kind(tb, lo, lt - 1);
    sort_by_file_kind(tb, gt + 1, hi);
}

static void file_explorer_event_handler(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_VALUE_CHANGED) {
        const char * cur_path =  lv_file_explorer_get_current_path(obj);
        const char * sel_fn = lv_file_explorer_get_selected_file_name(obj);

        LV_LOG_USER("%s%s", cur_path, sel_fn);
    }
    else if(code == LV_EVENT_READY) {
        lv_obj_t * tb = lv_file_explorer_get_file_table(obj);
        uint16_t sum = lv_table_get_row_count(tb);

        sort_by_file_kind(tb, 0, (sum - 1));
    }
}

void lv_example_file_explorer_3(void)
{
    lv_obj_t * file_explorer = lv_file_explorer_create(lv_screen_active());
    /*Before custom sort, please set the default sorting to NONE. The default is NONE.*/
    lv_file_explorer_set_sort(file_explorer, LV_EXPLORER_SORT_NONE);

#if LV_USE_FS_WIN32
    lv_file_explorer_open_dir(file_explorer, "D:");
#if LV_FILE_EXPLORER_QUICK_ACCESS
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_HOME_DIR, "C:/Users/Public/Desktop");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_VIDEO_DIR, "C:/Users/Public/Videos");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_PICTURES_DIR, "C:/Users/Public/Pictures");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_MUSIC_DIR, "C:/Users/Public/Music");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_DOCS_DIR, "C:/Users/Public/Documents");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_FS_DIR, "D:");
#endif

#else
    /* linux */
    lv_file_explorer_open_dir(file_explorer, "A:/");
#if LV_FILE_EXPLORER_QUICK_ACCESS
    char * envvar = "HOME";
    char home_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(home_dir, "A:");
    /* get the user's home directory from the HOME environment variable*/
    strcat(home_dir, getenv(envvar));
    LV_LOG_USER("home_dir: %s\n", home_dir);
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_HOME_DIR, home_dir);
    char video_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(video_dir, home_dir);
    strcat(video_dir, "/Videos");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_VIDEO_DIR, video_dir);
    char picture_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(picture_dir, home_dir);
    strcat(picture_dir, "/Pictures");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_PICTURES_DIR, picture_dir);
    char music_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(music_dir, home_dir);
    strcat(music_dir, "/Music");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_MUSIC_DIR, music_dir);
    char document_dir[LV_FS_MAX_PATH_LENGTH];
    strcpy(document_dir, home_dir);
    strcat(document_dir, "/Documents");
    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_DOCS_DIR, document_dir);

    lv_file_explorer_set_quick_access_path(file_explorer, LV_EXPLORER_FS_DIR, "A:/");
#endif
#endif

    lv_obj_add_event_cb(file_explorer, file_explorer_event_handler, LV_EVENT_ALL, NULL);
}

#endif

---

API

lv_file_explorer.h

lv_types.h