[FL-1300] iButton app: save selected menu item and selected file position. (#489)

* GUI module submenu: fix documentation
* GUI module submenu: add submenu_set_selected_item fn
* App iButton: use submenu_set_selected_item to store and set selected item in submenu
* App iButton: swap write and emulate in "saved key menu" scene
* App iButton: file select can now switch to the previous selected file
* App iButton: swap write and emulate indexes in "saved key menu" scene

Co-authored-by: あく <alleteam@gmail.com>

applications/gui/modules/file_select.c

@@ -387,4 +387,90 @@ bool file_select_fill_count(FileSelect* file_select) {
     dir_api->close(&directory);
     free(name);
     return true;
+}
+
+void file_select_set_selected_file_internal(FileSelect* file_select, const char* filename) {
+    furi_assert(file_select);
+    furi_assert(filename);
+    furi_assert(file_select->fs_api);
+    furi_assert(file_select->path);
+    furi_assert(file_select->extension);
+
+    if(strlen(filename) == 0) return;
+
+    FileInfo file_info;
+    File directory;
+    bool result;
+    FS_Dir_Api* dir_api = &file_select->fs_api->dir;
+    const uint8_t name_length = 100;
+    char* name = calloc(name_length, sizeof(char));
+
+    uint16_t file_position = 0;
+
+    if(name == NULL) {
+        return;
+    }
+
+    result = dir_api->open(&directory, file_select->path);
+
+    if(!result) {
+        dir_api->close(&directory);
+        free(name);
+        return;
+    }
+
+    while(1) {
+        result = dir_api->read(&directory, &file_info, name, name_length);
+
+        if(directory.error_id == FSE_NOT_EXIST || name[0] == 0) {
+            break;
+        }
+
+        if(result) {
+            if(directory.error_id == FSE_OK) {
+                if(filter_file(file_select, &file_info, name)) {
+                    if(strcmp(filename, name) == 0) {
+                        break;
+                    }
+
+                    file_position++;
+                }
+            } else {
+                dir_api->close(&directory);
+                free(name);
+                return;
+            }
+        }
+    }
+
+    with_view_model(
+        file_select->view, (FileSelectModel * model) {
+            uint16_t max_first_file_index =
+                model->file_count > FILENAME_COUNT ? model->file_count - FILENAME_COUNT : 0;
+
+            model->first_file_index = file_position;
+
+            if(model->first_file_index > 0) {
+                model->first_file_index -= 1;
+            }
+
+            if(model->first_file_index >= max_first_file_index) {
+                model->first_file_index = max_first_file_index;
+            }
+
+            model->position = file_position - model->first_file_index;
+
+            return true;
+        });
+
+    dir_api->close(&directory);
+    free(name);
+}
+
+void file_select_set_selected_file(FileSelect* file_select, const char* filename) {
+    file_select_set_selected_file_internal(file_select, filename);
+
+    if(!file_select_fill_strings(file_select)) {
+        file_select->callback(false, file_select->context);
+    }
 }

applications/gui/modules/file_select.h

@@ -20,6 +20,7 @@ void file_select_set_callback(FileSelect* file_select, FileSelectCallback callba
 void file_select_set_filter(FileSelect* file_select, const char* path, const char* extension);
 void file_select_set_result_buffer(FileSelect* file_select, char* buffer, uint8_t buffer_size);
 bool file_select_init(FileSelect* file_select);
+void file_select_set_selected_file(FileSelect* file_select, const char* filename);
 
 #ifdef __cplusplus
 }

applications/gui/modules/submenu.c

@@ -168,6 +168,42 @@ void submenu_clean(Submenu* submenu) {
         });
 }
 
+void submenu_set_selected_item(Submenu* submenu, uint32_t index) {
+    with_view_model(
+        submenu->view, (SubmenuModel * model) {
+            uint32_t position = 0;
+            SubmenuItemArray_it_t it;
+            for(SubmenuItemArray_it(it, model->items); !SubmenuItemArray_end_p(it);
+                SubmenuItemArray_next(it)) {
+                if(index == SubmenuItemArray_cref(it)->index) {
+                    break;
+                }
+                position++;
+            }
+
+            if(position >= SubmenuItemArray_size(model->items)) {
+                position = 0;
+            }
+
+            model->position = position;
+            model->window_position = position;
+
+            if(model->window_position > 0) {
+                model->window_position -= 1;
+            }
+
+            if(SubmenuItemArray_size(model->items) <= 4) {
+                model->window_position = 0;
+            } else {
+                if(model->window_position >= (SubmenuItemArray_size(model->items) - 4)) {
+                    model->window_position = (SubmenuItemArray_size(model->items) - 4);
+                }
+            }
+
+            return true;
+        });
+}
+
 void submenu_process_up(Submenu* submenu) {
     with_view_model(
         submenu->view, (SubmenuModel * model) {

applications/gui/modules/submenu.h

@@ -10,23 +10,33 @@ typedef struct Submenu Submenu;
 typedef struct SubmenuItem SubmenuItem;
 typedef void (*SubmenuItemCallback)(void* context, uint32_t index);
 
-/* Allocate and initialize submenu
+/**
+ * @brief Allocate and initialize submenu
  * This submenu is used to select one option
  */
 Submenu* submenu_alloc();
 
-/* Deinitialize and free submenu
+/**
+ * @brief Allocate and initialize submenu for vertical display
+ * This submenu is used to select one option
+ */
+Submenu* submenu_vertical_alloc();
+
+/**
+ * @brief Deinitialize and free submenu
  * @param submenu - Submenu instance
  */
 void submenu_free(Submenu* submenu);
 
-/* Get submenu view
+/**
+ * @brief Get submenu view
  * @param submenu - Submenu instance
  * @return View instance that can be used for embedding
  */
 View* submenu_get_view(Submenu* submenu);
 
-/* Add item to submenu
+/**
+ * @brief Add item to submenu
  * @param submenu - Submenu instance
  * @param label - menu item label
  * @param index - menu item index, used for callback, may be the same with other items
@@ -41,12 +51,18 @@ SubmenuItem* submenu_add_item(
     SubmenuItemCallback callback,
     void* callback_context);
 
-/* Remove all items from submenu
+/**
+ * @brief Remove all items from submenu
  * @param submenu - Submenu instance
  */
 void submenu_clean(Submenu* submenu);
 
-Submenu* submenu_vertical_alloc();
+/**
+ * @brief Set submenu item selector
+ * @param submenu 
+ * @param index 
+ */
+void submenu_set_selected_item(Submenu* submenu, uint32_t index);
 
 #ifdef __cplusplus
 }