File Explorer（文件资源管理器）

显示原文

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 lv_table.h, and the quick access bar is based on lv_list.h. Therefore, care should be taken to ensure that lv_table.h and lv_list.h are enabled.

lv_file_explorer 提供了一个API来浏览文件系统的内容。 lv_file_explorer 只提供了文件浏览功能，但不提供实际的文件操作功能。换句话说，你不能像在电脑上那样点击一个图片文件来打开和查看图片。 lv_file_explorer 会告诉你当前点击的文件的完整路径和名称。文件操作功能需要用户自己实现。

lv_file_explorer 中的文件列表是基于 lv_table，快速访问栏是基于 lv_list。因此，需要确保 lv_table 和 lv_list 处于启用状态。

Usage（用法）

显示原文

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.

启用 lv_conf.h 中的 LV_USE_FILE_EXPLORER。

首先使用 lv_file_explorer_create(lv_screen_active()) 来创建一个文件浏览器，其默认大小为屏幕大小。之后，您可以像小部件一样自定义样式。

Quick access（快速访问）

显示原文

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

快速访问栏是可选的。您可以在 lv_conf.h 中关闭 LV_FILE_EXPLORER_QUICK_ACCESS，这样快速访问栏就不会被创建。这可以节省一些内存，但并不多。创建快速访问栏后，可以通过单击浏览区域左上角的按钮来隐藏它，对于小屏幕设备非常有用。

您可以使用 lv_file_explorer_set_quick_access_path(file_explorer, LV_FILE_EXPLORER_QA_XX, "path") 来设置快速访问栏的路径。快速访问栏的项目是固定的。目前有以下项目：

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（排序）

显示原文

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.

你可以使用 lv_file_explorer_set_sort(file_explorer, LV_EXPLORER_SORT_XX) 来设置排序方法。

以下是几种排序方法：

LV_EXPLORER_SORT_NONE
LV_EXPLORER_SORT_KIND

你可以自定义排序方式。在自定义排序之前，请将默认排序设置为 LV_EXPLORER_SORT_NONE。默认值为 LV_EXPLORER_SORT_NONE。

Events（事件）

显示原文

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(obj);
        char * sel_fn = lv_file_explorer_get_sel_fn(obj);
        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.

LV_EVENT_READY 当打开一个目录时，发送此事件。您可以自定义排序。
LV_EVENT_VALUE_CHANGED 当文件列表中的项（文件）被点击时，发送此事件。

您可以使用 lv_file_explorer_get_cur_path() 获取当前路径，使用 lv_file_explorer_get_sel_fn() 获取当前选定文件的名称，以供事件处理函数使用。例如：

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(obj);
        char * sel_fn = lv_file_explorer_get_sel_fn(obj);
        LV_LOG_USER("%s%s", cur_path, sel_fn);
    }
}

您也可以使用类似于 strcpy() 和 strcat() 的函数，将获取到的路径和文件名保存在数组中，以供以后使用。

Example(示例)

[English]

Simple File Explorer

#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);
        uint16_t path_len = strlen(cur_path);
        uint16_t fn_len = strlen(sel_fn);

        if((path_len + fn_len) <= LV_FILE_EXPLORER_PATH_MAX_LEN) {
            char file_info[LV_FILE_EXPLORER_PATH_MAX_LEN];

            strcpy(file_info, cur_path);
            strcat(file_info, sel_fn);

            LV_LOG_USER("%s", file_info);
        }
        else    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

#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);
        uint16_t path_len = strlen(cur_path);
        uint16_t fn_len = strlen(sel_fn);

        if((path_len + fn_len) <= LV_FILE_EXPLORER_PATH_MAX_LEN) {
            char file_info[LV_FILE_EXPLORER_PATH_MAX_LEN];

            strcpy(file_info, cur_path);
            strcat(file_info, sel_fn);

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

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);
        }
    }
}

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);

    /*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

Custom sort

#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);
        uint16_t path_len = strlen(cur_path);
        uint16_t fn_len = strlen(sel_fn);

        if((path_len + fn_len) <= LV_FILE_EXPLORER_PATH_MAX_LEN) {
            char file_info[LV_FILE_EXPLORER_PATH_MAX_LEN];

            strcpy(file_info, cur_path);
            strcat(file_info, sel_fn);

            LV_LOG_USER("%s", file_info);
        }
        else    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

File Explorer（文件资源管理器）

Usage（用法）

Quick access（快速访问）

Sort（排序）

Events（事件）

Example(示例)

Simple File Explorer

Control File Explorer

Custom sort

API