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- /*
- * menu.c
- *
- * Copyright (c) 2023 Thomas Buck (thomas@xythobuz.de)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * See <http://www.gnu.org/licenses/>.
- */
-
- #include <string.h>
-
- #include "config.h"
- #include "buttons.h"
- #include "text.h"
- #include "textbox.h"
- #include "lcd.h"
- #include "menu.h"
-
- static char prev_buff[MENU_MAX_LEN] = {0};
- static struct menu_state menu = { .off = 0, .selection = -1, .length = 0, .buff = {0} };
- static void (*enter_callback)(int) = NULL;
- static void (*up_callback)(int) = NULL;
- static void (*down_callback)(int) = NULL;
- static void (*exit_callback)(void) = NULL;
-
- bool menu_got_input = false;
-
- static void menu_buttons(enum buttons btn, bool state) {
- menu_got_input = true;
-
- if (state && ((btn == BTN_ENTER) || (btn == BTN_A))) {
- if (enter_callback) {
- enter_callback(menu.selection);
- }
- return;
- } else if (state && (btn == BTN_B)) {
- if (up_callback) {
- up_callback(menu.selection);
- }
- return;
- } else if (state && (btn == BTN_X)) {
- if (down_callback) {
- down_callback(menu.selection);
- }
- return;
- } else if (state && (btn == BTN_Y)) {
- if (exit_callback) {
- exit_callback();
- }
- } else if ((!state) || ((btn != BTN_UP) && (btn != BTN_DOWN))) {
- return;
- }
-
- if (state && (btn == BTN_UP)) {
- if (menu.selection < 0) {
- menu.selection = menu.length - 1;
- } else {
- menu.selection -= 1;
- }
- } else if (state && (btn == BTN_DOWN)) {
- if (menu.selection < 0) {
- menu.selection = 0;
- } else {
- menu.selection += 1;
- }
- }
-
- if (menu.selection < 0) {
- menu.selection += menu.length;
- }
- if (menu.selection >= menu.length) {
- menu.selection -= menu.length;
- }
- if (menu.selection >= 0) {
- while (menu.selection < menu.off) {
- menu.off -= 1;
- }
- while (menu.selection >= (menu.off + menu.lines)) {
- menu.off += 1;
- }
- }
- }
-
- void menu_init(void (*enter)(int),
- void (*up)(int),
- void (*down)(int),
- void (*exit)(void)) {
- menu.off = 0;
- menu.selection = -1;
- menu.length = 0;
- menu.lines = MENU_MAX_LINES;
- menu.y_off = 0;
-
- enter_callback = enter;
- up_callback = up;
- down_callback = down;
- exit_callback = exit;
- buttons_callback(menu_buttons);
- }
-
- void menu_deinit(void) {
- buttons_callback(NULL);
- }
-
- void menu_run(void (*draw)(struct menu_state *), bool centered) {
- if (draw) {
- draw(&menu);
- }
-
- if (strncmp(menu.buff, prev_buff, MENU_MAX_LEN) != 0) {
- strncpy(prev_buff, menu.buff, MENU_MAX_LEN);
- text_box(menu.buff, centered,
- "fixed_10x20",
- 0, LCD_WIDTH,
- 50 + menu.y_off, MENU_BOX_HEIGHT(menu.lines, 20, 2),
- 0);
- }
- }
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