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Fixes and new apps (#30)

Browse Source 
- M5 Unit Modules library + M5 Unit Test app
- Minor fixes for TodoList, TwoEleven, Snake, Brainfuck and Breakout
- Fixed SerialConsole to use the uart controller as it was broken in one of the many updates
- Fixed keyboard input in TwoEleven, Breakout, Magic8Ball and Snake
- Bluetooth Media Keys app, supports pressing physical keys to trigger the corresponding buttonmatrix button
- Epub Reader app
This commit is contained in:
Shadowtrance
2026-06-07 23:56:32 +10:00
committed by GitHub
parent 1f959c8bbf
commit dbf850c434
127 changed files with 11156 additions and 174 deletions
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Apps/EpubReader/main/Source/EpubReaderUI.cpp
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#include "EpubReader.h"
#include <tt_lvgl_toolbar.h>
#include <tactility/log.h>
#include <esp_heap_caps.h>
#include <dirent.h>
#include <sys/stat.h>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <vector>
static const char* TAG = "EpubReader";
// Runtime-loaded Noto Serif fonts - 4 variants for the active display size tier.
// Loaded by EpubReader::loadFonts() on onShow, freed by unloadFonts() on onHide
// (skipped when onHide fires for a dialog roundtrip - tocDialogId_ will be non-zero).
// lv_binfont_create/destroy are exported by the firmware's lvgl-module symbols.
// NOTE: These are file-scope statics intentionally. Tactility runs one instance of
// each app at a time, so there is no multi-instance aliasing or use-after-free risk.
static lv_font_t* s_fontRegular = nullptr;
static lv_font_t* s_fontItalic = nullptr;
static lv_font_t* s_fontBold = nullptr;
static lv_font_t* s_fontBoldItalic = nullptr;
#define LVGL_SYMBOL_BOOK "\xEF\x94\xBE" // U+F53E (MaterialSymbols: book_2)
#define LVGL_SYMBOL_TEXT "\xEF\x87\x86" // U+F1C6 (MaterialSymbols: text_snippet)
// lv_list_add_btn places the icon image at child 0 and the text label at child 1.
// Centralise that assumption here so there's one place to update if LVGL changes.
static void setListBtnLongMode(lv_obj_t* btn, lv_label_long_mode_t mode) {
lv_obj_t* lbl = lv_obj_get_child(btn, 1);
if (lbl) lv_label_set_long_mode(lbl, mode);
}
// ---------------------------------------------------------------------------
// Toolbar helper
// ---------------------------------------------------------------------------
void EpubReader::setReaderToolbarButtons() {
tt_lvgl_toolbar_clear_actions(toolbar_);
tt_lvgl_toolbar_add_text_button_action(toolbar_, LV_SYMBOL_PREV, onPrevPressed, this);
if (!textMode_) {
tt_lvgl_toolbar_add_text_button_action(toolbar_, LV_SYMBOL_LIST, onTocPressed, this);
}
tt_lvgl_toolbar_add_text_button_action(toolbar_, LV_SYMBOL_NEXT, onNextPressed, this);
tt_lvgl_toolbar_add_text_button_action(toolbar_, LV_SYMBOL_DIRECTORY, onBrowsePressed, this);
}
void EpubReader::setBrowserToolbarButtons() {
tt_lvgl_toolbar_clear_actions(toolbar_);
// Show "Use Folder" button when the current browse path isn't already the saved books folder
if (browsePath_ != booksPath_) {
tt_lvgl_toolbar_add_text_button_action(toolbar_, LV_SYMBOL_DIRECTORY, onSetBooksFolder, this);
}
}
// ---------------------------------------------------------------------------
// UI builders
// ---------------------------------------------------------------------------
static const lv_font_t* selectIconFont() {
lv_coord_t w = lv_display_get_horizontal_resolution(nullptr);
lv_coord_t h = lv_display_get_vertical_resolution(nullptr);
bool isLarge = w >= 480 || h >= 320;
return isLarge ? &material_symbols_shared_32 : &material_symbols_shared_20;
}
const lv_font_t* selectContentFont(bool italic, bool bold) {
const lv_font_t* f = bold ? (italic ? s_fontBoldItalic : s_fontBold)
: (italic ? s_fontItalic : s_fontRegular);
if (f) return f;
// Variant not loaded (e.g. no-PSRAM device only loads regular) - fall back gracefully.
return s_fontRegular ? s_fontRegular : lv_font_get_default();
}
// ---------------------------------------------------------------------------
// Font lifecycle
// ---------------------------------------------------------------------------
void EpubReader::loadFonts() {
if (s_fontRegular) return; // already loaded
// Without PSRAM the heap is too constrained to hold even a single binary font
// alongside the epub parser and LVGL allocations - skip loading entirely.
// onShow() will have already shown an alert dialog for this case.
if (heap_caps_get_total_size(MALLOC_CAP_SPIRAM) == 0) return;
// Verify the assets directory exists before attempting individual file loads.
// This produces one clear diagnostic instead of one error per font file.
char assetsDir[256]; size_t dirSz = sizeof(assetsDir);
tt_app_get_assets_path(appHandle_, assetsDir, &dirSz);
if (dirSz == 0) {
LOG_E(TAG, "loadFonts: could not resolve assets path");
return;
}
struct stat st;
if (stat(assetsDir, &st) != 0 || !S_ISDIR(st.st_mode)) {
LOG_W(TAG, "loadFonts: assets directory not found: %s", assetsDir);
return;
}
lv_coord_t w = lv_display_get_horizontal_resolution(nullptr);
lv_coord_t h = lv_display_get_vertical_resolution(nullptr);
const char* sz;
if (w >= 1000 || h >= 1000) sz = "36";
else if (w >= 600 || h >= 480 ) sz = "28";
else if (w >= 400 || h >= 300 ) sz = "20";
else sz = "16";
struct Variant { const char* suffix; lv_font_t** ptr; };
Variant variants[] = {
{ "regular", &s_fontRegular },
{ "italic", &s_fontItalic },
{ "bold", &s_fontBold },
{ "bold_italic", &s_fontBoldItalic },
};
for (auto& v : variants) {
char filename[64];
snprintf(filename, sizeof(filename), "font_%spt_%s.bin", sz, v.suffix);
char assetPath[256]; size_t pathSz = sizeof(assetPath);
tt_app_get_assets_child_path(appHandle_, filename, assetPath, &pathSz);
if (pathSz == 0) {
LOG_E(TAG, "loadFonts: no asset path for %s", filename);
continue;
}
// LVGL STDIO driver letter 'A' with empty path prefix: "A:/foo" → fopen("/foo")
std::string lvglPath = std::string("A:") + assetPath;
*v.ptr = lv_binfont_create(lvglPath.c_str());
if (!*v.ptr) LOG_E(TAG, "lv_binfont_create failed: %s", assetPath);
else LOG_I(TAG, "Font loaded: %s (%dpt)", v.suffix, atoi(sz));
}
}
void EpubReader::unloadFonts() {
lv_font_t** ptrs[] = { &s_fontRegular, &s_fontItalic, &s_fontBold, &s_fontBoldItalic };
for (auto* p : ptrs) {
if (*p) { lv_binfont_destroy(*p); *p = nullptr; }
}
}
void EpubReader::buildReaderUI(lv_obj_t* parent) {
lv_obj_t* scroll = lv_obj_create(parent);
lv_obj_set_width(scroll, LV_PCT(100));
lv_obj_set_flex_grow(scroll, 1);
lv_obj_set_style_pad_all(scroll, 6, 0);
lv_obj_set_style_border_width(scroll, 0, 0);
// Tap left half = prev, right half = next.
// LV_EVENT_CLICKED only fires on press+release with minimal movement,
// so it won't conflict with vertical scrolling in text mode.
lv_obj_add_event_cb(scroll, onReaderTap, LV_EVENT_CLICKED, this);
if (textMode_) {
// Plain text file: single label, Prev/Next scroll by screen height.
contentWidget_ = lv_label_create(scroll);
lv_obj_set_width(contentWidget_, LV_PCT(100));
lv_label_set_long_mode(contentWidget_, LV_LABEL_LONG_MODE_WRAP);
lv_obj_set_style_text_font(contentWidget_, selectContentFont(false, false), 0);
lv_label_set_text(contentWidget_, pageContent_.c_str());
lv_obj_scroll_to_y(scroll, (lv_coord_t)pageOffset_, LV_ANIM_OFF);
saveProgress();
} else if (epub_) {
// EPUB: transparent flex-column container; renderPage() fills it with
// per-paragraph labels (one per paragraph, with individual alignment).
contentWidget_ = lv_obj_create(scroll);
lv_obj_set_width(contentWidget_, LV_PCT(100));
lv_obj_set_height(contentWidget_, LV_SIZE_CONTENT);
lv_obj_set_flex_flow(contentWidget_, LV_FLEX_FLOW_COLUMN);
lv_obj_set_style_pad_all(contentWidget_, 0, 0);
// One line-height of gap between paragraphs keeps all paragraph tops on
// exact lineH-multiple boundaries - required for snapStep to work cleanly.
lv_obj_set_style_pad_row(contentWidget_,
(lv_coord_t)lv_font_get_line_height(selectContentFont(false, false)), 0);
lv_obj_set_style_border_width(contentWidget_, 0, 0);
lv_obj_set_style_bg_opa(contentWidget_, LV_OPA_TRANSP, 0);
lv_obj_remove_flag(contentWidget_, LV_OBJ_FLAG_SCROLLABLE);
lv_obj_remove_flag(contentWidget_, LV_OBJ_FLAG_CLICKABLE);
loadChapter(currentSpineIndex_, +1);
}
}
// ---------------------------------------------------------------------------
// renderSlice helpers - inline bold/italic via lv_spangroup
// ---------------------------------------------------------------------------
// Returns true if the text segment contains any inline bold/italic ESC tokens.
static bool hasInlineTokens(const char* s, size_t len) {
for (size_t i = 0; i + 1 < len; ++i) {
if ((unsigned char)s[i] == 0x1B) {
char t = s[i + 1];
if (t == 'B' || t == 'b' || t == 'I' || t == 'i') return true;
}
}
return false;
}
// Builds an lv_spangroup for a paragraph containing inline bold/italic ESC tokens.
// Each ESC+B/b/I/i boundary becomes a new span with the appropriate font.
static void renderSpanParagraph(lv_obj_t* parent, const char* seg, size_t len,
lv_text_align_t align) {
lv_obj_t* sg = lv_spangroup_create(parent);
lv_obj_set_width(sg, LV_PCT(100));
lv_obj_set_height(sg, LV_SIZE_CONTENT);
lv_obj_set_style_pad_all(sg, 0, 0); // keep heights = N*lineH (same rule as lv_label)
lv_spangroup_set_align(sg, align);
lv_spangroup_set_mode(sg, LV_SPAN_MODE_BREAK); // wrap to content height
lv_obj_remove_flag(sg, LV_OBJ_FLAG_CLICKABLE);
bool bold = false, italic = false;
std::string run;
run.reserve(len);
auto flushRun = [&]() {
if (run.empty()) return;
lv_span_t* span = lv_spangroup_add_span(sg);
lv_span_set_text(span, run.c_str());
lv_style_set_text_font(lv_span_get_style(span), selectContentFont(italic, bold));
run.clear();
};
for (size_t i = 0; i < len; ++i) {
unsigned char c = (unsigned char)seg[i];
if (c == 0x1B && i + 1 < len) {
char tok = seg[i + 1];
if (tok == 'B') { flushRun(); bold = true; ++i; continue; }
if (tok == 'b') { flushRun(); bold = false; ++i; continue; }
if (tok == 'I') { flushRun(); italic = true; ++i; continue; }
if (tok == 'i') { flushRun(); italic = false; ++i; continue; }
}
run += (char)c;
}
flushRun();
lv_spangroup_refresh(sg);
}
// ---------------------------------------------------------------------------
// renderSlice - parse ESC-encoded text into per-paragraph LVGL widgets
// ---------------------------------------------------------------------------
// ESC token protocol (see HtmlStrip.h):
// Every paragraph starts with ESC + 'L'|'C'|'R' (alignment).
// Paragraphs are separated by '\n\n'.
// Single '\n' = line break within a paragraph.
// Inline ESC+'B'/'b'/'I'/'i' tokens delimit bold/italic runs.
//
// Paragraphs without inline tokens → lv_label (lighter, fewer allocations).
// Paragraphs with inline tokens → lv_spangroup (per-span font selection).
void EpubReader::renderSlice(const std::string& slice) {
if (!contentWidget_) return;
const lv_font_t* font = selectContentFont(false, false);
size_t pos = 0;
const size_t len = slice.size();
while (pos < len) {
// Find the next paragraph boundary (\n\n) or end of string
size_t nlnl = slice.find("\n\n", pos);
size_t paraEnd = (nlnl != std::string::npos) ? nlnl : len;
// Extract alignment from leading ESC token
lv_text_align_t align = LV_TEXT_ALIGN_LEFT;
size_t textStart = pos;
if (paraEnd > pos + 1 && (unsigned char)slice[pos] == 0x1B) {
char code = slice[pos + 1];
if (code == 'C') align = LV_TEXT_ALIGN_CENTER;
else if (code == 'R') align = LV_TEXT_ALIGN_RIGHT;
textStart = pos + 2;
}
const char* seg = slice.data() + textStart;
size_t segLen = paraEnd - textStart;
// Skip blank paragraphs
bool hasContent = false;
for (size_t k = 0; k < segLen; ++k) {
char ch = seg[k];
if (ch != ' ' && ch != '\n') { hasContent = true; break; }
}
if (hasContent) {
if (hasInlineTokens(seg, segLen)) {
// Mixed-style paragraph: spangroup renders inline bold/italic runs
renderSpanParagraph(contentWidget_, seg, segLen, align);
} else {
// Plain paragraph: lv_label (simpler, lower memory overhead)
lv_obj_t* lbl = lv_label_create(contentWidget_);
lv_obj_set_width(lbl, LV_PCT(100));
lv_obj_set_style_pad_all(lbl, 0, 0); // override theme padding; keeps heights = N*lineH
lv_label_set_long_mode(lbl, LV_LABEL_LONG_MODE_WRAP);
lv_obj_set_style_text_font(lbl, font, 0);
lv_obj_set_style_text_align(lbl, align, 0);
lv_label_set_text(lbl, std::string(seg, segLen).c_str());
}
}
pos = (nlnl != std::string::npos) ? nlnl + 2 : len;
}
}
void EpubReader::buildBrowserUI(lv_obj_t* parent) {
// When at the configured books folder, show the shelf instead of the file list
if (!booksPath_.empty() && browsePath_ == booksPath_) {
buildShelfUI(parent);
return;
}
// Path bar
lv_obj_t* pathBar = lv_obj_create(parent);
lv_obj_set_size(pathBar, LV_PCT(100), LV_SIZE_CONTENT);
lv_obj_set_flex_flow(pathBar, LV_FLEX_FLOW_ROW);
lv_obj_set_flex_align(pathBar, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
lv_obj_set_style_pad_all(pathBar, 4, 0);
lv_obj_set_style_pad_gap(pathBar, 4, 0);
lv_obj_set_style_border_width(pathBar, 0, 0);
lv_obj_set_style_bg_opa(pathBar, LV_OPA_TRANSP, 0);
lv_obj_remove_flag(pathBar, LV_OBJ_FLAG_SCROLLABLE);
if (browsePath_ != dataRoot_) {
lv_obj_t* backBtn = lv_button_create(pathBar);
lv_obj_set_size(backBtn, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
lv_obj_set_style_pad_all(backBtn, 4, 0);
lv_label_set_text(lv_label_create(backBtn), LV_SYMBOL_LEFT " Back");
lv_obj_add_event_cb(backBtn, onBrowserBack, LV_EVENT_CLICKED, this);
}
lv_obj_t* pathLabel = lv_label_create(pathBar);
lv_obj_set_flex_grow(pathLabel, 1);
lv_label_set_text(pathLabel, browsePath_.c_str());
lv_label_set_long_mode(pathLabel, LV_LABEL_LONG_MODE_DOTS);//LV_LABEL_LONG_MODE_SCROLL_CIRCULAR
// File list
lv_obj_t* list = lv_list_create(parent);
lv_obj_set_width(list, LV_PCT(100));
lv_obj_set_flex_grow(list, 1);
lv_obj_set_style_border_width(list, 0, 0);
// Scan directory
browserEntries_.clear();
DIR* dir = opendir(browsePath_.c_str());
if (dir) {
struct dirent* entry;
while ((entry = readdir(dir)) != nullptr) {
if (entry->d_name[0] == '.') continue;
std::string name(entry->d_name);
bool isDir = (entry->d_type == DT_DIR);
if (entry->d_type == DT_UNKNOWN) {
struct stat st;
std::string fullPath = browsePath_ + "/" + name;
if (stat(fullPath.c_str(), &st) == 0) {
isDir = S_ISDIR(st.st_mode);
}
}
if (isDir || isSupportedFile(name)) {
browserEntries_.push_back({name, isDir});
}
}
closedir(dir);
} else {
LOG_W(TAG, "Cannot open dir: %s", browsePath_.c_str());
}
// Sort: directories first, then alphabetically within each group
std::sort(browserEntries_.begin(), browserEntries_.end(),
[](const auto& a, const auto& b) {
if (a.second != b.second) return a.second > b.second;
return a.first < b.first;
});
if (browserEntries_.empty()) {
lv_list_add_text(list, "No supported files found.");
} else {
for (size_t i = 0; i < browserEntries_.size(); ++i) {
const auto& [name, isDir] = browserEntries_[i];
const char* icon = isDir ? LV_SYMBOL_DIRECTORY : LV_SYMBOL_FILE;
lv_obj_t* btn = lv_list_add_button(list, icon, name.c_str());
lv_obj_set_user_data(btn, (void*)(uintptr_t)i);
lv_obj_add_event_cb(btn, onBrowserItem, LV_EVENT_CLICKED, this);
setListBtnLongMode(btn, LV_LABEL_LONG_MODE_DOTS);//LV_LABEL_LONG_MODE_SCROLL_CIRCULAR
}
}
}
// Recursively scans path for epub/txt files, appending entries to browserEntries_.
// Called with prefix="" for booksPath_; recurses one level into subdirectories.
void EpubReader::scanBooksDir(const std::string& path, const std::string& prefix) {
DIR* d = opendir(path.c_str());
if (!d) return;
struct dirent* ent;
while ((ent = readdir(d)) != nullptr) {
if (ent->d_name[0] == '.') continue;
std::string name(ent->d_name);
bool isDir = (ent->d_type == DT_DIR);
if (ent->d_type == DT_UNKNOWN) {
struct stat st;
if (stat((path + "/" + name).c_str(), &st) == 0)
isDir = S_ISDIR(st.st_mode);
}
if (isDir && prefix.empty()) {
scanBooksDir(path + "/" + name, name + "/");
} else if (!isDir) {
auto p = name.rfind('.');
if (p == std::string::npos) continue;
std::string e = name.substr(p);
std::transform(e.begin(), e.end(), e.begin(), ::tolower);
if (e == ".epub" || e == ".txt")
browserEntries_.push_back({prefix + name, false});
}
}
closedir(d);
}
// Books shelf view - shown when browsePath_ == booksPath_.
// Scans booksPath_ and one level of subdirectories into a single flat sorted list.
void EpubReader::buildShelfUI(lv_obj_t* parent) {
lv_coord_t dispW = lv_display_get_horizontal_resolution(nullptr);
lv_coord_t dispH = lv_display_get_vertical_resolution(nullptr);
bool isLarge = (dispW >= 480 || dispH >= 480);
bool isXLarge = (dispW >= 600 || dispH >= 600);
int pageSize = isXLarge ? 8 : (isLarge ? 6 : 4);
int padBar = isLarge ? 4 : 2;
int navPadHor = isLarge ? 12 : 6;
int navPadVer = isLarge ? 6 : 3;
// Optional path bar with Back so the user can navigate away from the shelf
if (booksPath_ != dataRoot_) {
lv_obj_t* pathBar = lv_obj_create(parent);
lv_obj_set_size(pathBar, LV_PCT(100), LV_SIZE_CONTENT);
lv_obj_set_flex_flow(pathBar, LV_FLEX_FLOW_ROW);
lv_obj_set_flex_align(pathBar, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
lv_obj_set_style_pad_all(pathBar, padBar, 0);
lv_obj_set_style_pad_gap(pathBar, padBar, 0);
lv_obj_set_style_border_width(pathBar, 0, 0);
lv_obj_set_style_bg_opa(pathBar, LV_OPA_TRANSP, 0);
lv_obj_remove_flag(pathBar, LV_OBJ_FLAG_SCROLLABLE);
lv_obj_t* backBtn = lv_button_create(pathBar);
lv_obj_set_size(backBtn, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
lv_obj_set_style_pad_all(backBtn, padBar, 0);
lv_label_set_text(lv_label_create(backBtn), LV_SYMBOL_LEFT " Browse");
lv_obj_add_event_cb(backBtn, onBrowserBack, LV_EVENT_CLICKED, this);
lv_obj_t* pathLbl = lv_label_create(pathBar);
lv_obj_set_flex_grow(pathLbl, 1);
lv_label_set_long_mode(pathLbl, LV_LABEL_LONG_MODE_DOTS);//LV_LABEL_LONG_MODE_SCROLL_CIRCULAR
lv_label_set_text(pathLbl, booksPath_.c_str());
}
// Scan booksPath_ for books, and one level of subdirectories into a flat list.
// Subfolder entries are stored as "subfolder/filename" so onBrowserItem builds
// the correct full path via browsePath_ + "/" + name.
browserEntries_.clear();
scanBooksDir(booksPath_, "");
// Sort alphabetically by filename (ignoring subfolder prefix)
std::sort(browserEntries_.begin(), browserEntries_.end(),
[](const auto& a, const auto& b) {
// rfind returns npos if no '/' found; npos+1 wraps to 0, yielding the full string
auto nameA = a.first.substr(a.first.rfind('/') + 1);
auto nameB = b.first.substr(b.first.rfind('/') + 1);
return std::lexicographical_compare(
nameA.begin(), nameA.end(),
nameB.begin(), nameB.end(),
[](char ca, char cb) { return std::tolower((unsigned char)ca) < std::tolower((unsigned char)cb); });
});
// Clamp shelfPage_ to valid range
int totalItems = (int)browserEntries_.size();
int totalPages = std::max(1, (totalItems + pageSize - 1) / pageSize);
shelfPage_ = std::max(0, std::min(shelfPage_, totalPages - 1));
int startIdx = shelfPage_ * pageSize;
int endIdx = std::min(startIdx + pageSize, totalItems);
// Non-scrollable list; items share height equally via flex_grow=1
lv_obj_t* list = lv_list_create(parent);
lv_obj_set_width(list, LV_PCT(100));
lv_obj_set_flex_grow(list, 1);
lv_obj_set_style_border_width(list, 0, 0);
lv_obj_remove_flag(list, LV_OBJ_FLAG_SCROLLABLE);
if (browserEntries_.empty()) {
lv_list_add_text(list, "No books found in books folder.");
} else {
for (int i = startIdx; i < endIdx; ++i) {
const std::string& entry = browserEntries_[(size_t)i].first;
// Display name: strip subfolder prefix and extension
std::string displayName = entry.substr(entry.rfind('/') + 1);
auto dot = displayName.rfind('.');
if (dot != std::string::npos) displayName = displayName.substr(0, dot);
auto dotPos = entry.rfind('.');
std::string ext = (dotPos != std::string::npos) ? entry.substr(dotPos) : "";
std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower);
const char* icon = (ext == ".txt") ? LVGL_SYMBOL_TEXT : LVGL_SYMBOL_BOOK;
lv_obj_t* btn = lv_list_add_button(list, icon, displayName.c_str());
lv_obj_set_flex_grow(btn, 1); // equal height share across page items
lv_obj_set_user_data(btn, (void*)(uintptr_t)i);
lv_obj_add_event_cb(btn, onBrowserItem, LV_EVENT_CLICKED, this);
setListBtnLongMode(btn, LV_LABEL_LONG_MODE_DOTS);//LV_LABEL_LONG_MODE_SCROLL_CIRCULAR
lv_obj_t* iconLbl = lv_obj_get_child(btn, 0);
if (iconLbl) lv_obj_set_style_text_font(iconLbl, selectIconFont(), 0);
}
}
// ── Bottom navigation bar ─────────────────────────────────────────────────
lv_obj_t* navBar = lv_obj_create(parent);
lv_obj_set_size(navBar, LV_PCT(100), LV_SIZE_CONTENT);
lv_obj_set_flex_flow(navBar, LV_FLEX_FLOW_ROW);
lv_obj_set_flex_align(navBar, LV_FLEX_ALIGN_SPACE_EVENLY, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
lv_obj_set_style_pad_all(navBar, padBar, 0);
lv_obj_set_style_pad_gap(navBar, padBar, 0);
lv_obj_set_style_border_width(navBar, 0, 0);
lv_obj_set_style_bg_opa(navBar, LV_OPA_TRANSP, 0);
lv_obj_remove_flag(navBar, LV_OBJ_FLAG_SCROLLABLE);
bool canPrev = (shelfPage_ > 0);
bool canNext = (shelfPage_ < totalPages - 1);
auto makeNavBtn = [&](const char* label, lv_event_cb_t cb, bool enabled) {
lv_obj_t* btn = lv_button_create(navBar);
lv_obj_set_size(btn, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
lv_obj_set_style_pad_hor(btn, navPadHor, 0);
lv_obj_set_style_pad_ver(btn, navPadVer, 0);
lv_label_set_text(lv_label_create(btn), label);
if (enabled) lv_obj_add_event_cb(btn, cb, LV_EVENT_CLICKED, this);
else lv_obj_add_state(btn, LV_STATE_DISABLED);
};
makeNavBtn(LV_SYMBOL_PREV, onShelfFirst, canPrev);
makeNavBtn(LV_SYMBOL_LEFT, onShelfPrev, canPrev);
char pageBuf[24];
snprintf(pageBuf, sizeof(pageBuf), "%d / %d", shelfPage_ + 1, totalPages);
lv_obj_t* pageLbl = lv_label_create(navBar);
lv_obj_set_style_pad_hor(pageLbl, 10, 0);
lv_label_set_text(pageLbl, pageBuf);
makeNavBtn(LV_SYMBOL_RIGHT, onShelfNext, canNext);
makeNavBtn(LV_SYMBOL_NEXT, onShelfLast, canNext);
}