386 lines
12 KiB
C++
386 lines
12 KiB
C++
/*
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* main.cpp
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* PDF Viewer app -- global state, entry point, event loop
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* Copyright (c) 2026 Daniel Hammer
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*/
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#include "pdfviewer.h"
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#include <gui/dialogs.hpp>
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#include <gui/standalone.hpp>
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// ============================================================================
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// Global state definitions
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// ============================================================================
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int g_win_w = INIT_W;
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int g_win_h = INIT_H;
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PdfDoc g_doc = {};
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int g_current_page = 0;
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int g_scroll_y = 0;
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float g_zoom = 1.0f;
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char g_filepath[256] = {};
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bool g_pathbar_open = false;
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char g_pathbar_text[256] = {};
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int g_pathbar_len = 0;
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int g_pathbar_cursor = 0;
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TrueTypeFont* g_font = nullptr;
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TrueTypeFont* g_font_bold = nullptr;
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TrueTypeFont* g_font_mono = nullptr;
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SvgIcon g_icon_folder = {};
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SvgIcon g_icon_print = {};
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char g_status_msg[128] = {};
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// ============================================================================
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// Toolbar hit-testing constants
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// ============================================================================
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// Toolbar buttons: Open | Print | < > | - +
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static constexpr int TB_OPEN_X0 = 4, TB_OPEN_X1 = 28;
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static constexpr int TB_PRINT_X0 = 32, TB_PRINT_X1 = 56;
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// separator at 64
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static constexpr int TB_PREV_X0 = 72, TB_PREV_X1 = 96;
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static constexpr int TB_NEXT_X0 = 100, TB_NEXT_X1 = 124;
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// separator at 132
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static constexpr int TB_ZOUT_X0 = 140, TB_ZOUT_X1 = 164;
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static constexpr int TB_ZIN_X0 = 168, TB_ZIN_X1 = 192;
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// ============================================================================
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// Helpers
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// ============================================================================
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static int max_scroll() {
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if (!g_doc.valid || g_current_page >= g_doc.page_count) return 0;
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PdfPage* page = &g_doc.pages[g_current_page];
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int page_h = (int)(page->height * g_zoom) + PAGE_MARGIN * 2;
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int pathbar_h = g_pathbar_open ? PATHBAR_H : 0;
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int content_h = g_win_h - TOOLBAR_H - pathbar_h - STATUS_BAR_H;
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int ms = page_h - content_h;
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return ms > 0 ? ms : 0;
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}
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static void clamp_scroll() {
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int ms = max_scroll();
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if (g_scroll_y < 0) g_scroll_y = 0;
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if (g_scroll_y > ms) g_scroll_y = ms;
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}
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static const char* file_basename(const char* path) {
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if (!path || !path[0]) return "";
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const char* name = path;
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for (int i = 0; path[i]; i++) {
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if (path[i] == '/') name = path + i + 1;
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}
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return name;
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}
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static void go_to_page(int page) {
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if (page < 0) page = 0;
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if (page >= g_doc.page_count) page = g_doc.page_count - 1;
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g_current_page = page;
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g_scroll_y = 0;
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ensure_page_parsed(page);
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trim_page_cache(page);
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}
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static void zoom_in() {
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if (g_zoom < 4.0f) {
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g_zoom += 0.25f;
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clamp_scroll();
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}
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}
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static void zoom_out() {
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if (g_zoom > 0.25f) {
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g_zoom -= 0.25f;
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clamp_scroll();
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}
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}
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static void open_file(const char* path) {
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str_cpy(g_filepath, path, 256);
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g_current_page = 0;
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g_scroll_y = 0;
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if (load_pdf(path)) {
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// Success
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} else {
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g_filepath[0] = '\0';
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}
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}
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static void open_inline_pathbar(const char* initial_text) {
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g_pathbar_open = true;
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if (!initial_text) initial_text = "";
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str_cpy(g_pathbar_text, initial_text, sizeof(g_pathbar_text));
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g_pathbar_len = str_len(g_pathbar_text);
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g_pathbar_cursor = g_pathbar_len;
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}
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static void open_file_dialog() {
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char path[256] = {};
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if (dialogs::open_file("Open PDF", g_filepath, path, sizeof(path), g_status_msg, sizeof(g_status_msg))) {
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open_file(path);
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} else if (g_status_msg[0]) {
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open_inline_pathbar(g_filepath);
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}
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}
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static void print_file_dialog() {
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if (!g_filepath[0]) {
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str_cpy(g_status_msg, "Open a PDF before printing", sizeof(g_status_msg));
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return;
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}
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char job_id[64] = {};
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char msg[128] = {};
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if (dialogs::print_file("Print PDF", g_filepath, file_basename(g_filepath),
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job_id, sizeof(job_id), msg, sizeof(msg))) {
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if (msg[0]) str_cpy(g_status_msg, msg, sizeof(g_status_msg));
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else str_cpy(g_status_msg, "Print job queued", sizeof(g_status_msg));
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} else if (msg[0]) {
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str_cpy(g_status_msg, msg, sizeof(g_status_msg));
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}
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}
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// ============================================================================
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// Entry point
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// ============================================================================
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extern "C" void _start() {
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// Load fonts
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auto load_font = [](const char* path) -> TrueTypeFont* {
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TrueTypeFont* f = (TrueTypeFont*)montauk::malloc(sizeof(TrueTypeFont));
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if (!f) return nullptr;
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montauk::memset(f, 0, sizeof(TrueTypeFont));
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if (!f->init(path)) { montauk::mfree(f); return nullptr; }
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return f;
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};
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g_font = load_font("0:/fonts/Roboto-Medium.ttf");
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g_font_bold = load_font("0:/fonts/Roboto-Bold.ttf");
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g_font_mono = load_font("0:/fonts/JetBrainsMono-Regular.ttf");
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// Load toolbar icons
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Color icon_color = HEADER_TEXT;
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g_icon_folder = svg_load("0:/icons/folder.svg", 16, 16, icon_color);
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g_icon_print = svg_load("0:/icons/printer-symbolic.svg", 16, 16, icon_color);
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// Check for file argument
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char args[512] = {};
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int arglen = montauk::getargs(args, sizeof(args));
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if (arglen > 0 && args[0]) {
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open_file(args);
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}
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// Build window title
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char title[64] = "PDF Viewer";
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if (g_filepath[0]) {
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const char* fname = file_basename(g_filepath);
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snprintf(title, 64, "%s - PDF Viewer", fname);
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}
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WsWindow win;
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if (!win.create(title, INIT_W, INIT_H))
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montauk::exit(1);
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uint32_t* pixels = win.pixels;
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render(pixels);
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win.present();
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while (true) {
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montauk::abi::WinEvent ev;
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int r = win.poll(&ev);
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if (r < 0) break;
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if (r == 0) {
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montauk::sleep_ms(16);
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continue;
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}
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// Close
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if (ev.type == 3) break;
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// Resize
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if (ev.type == 2) {
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g_win_w = win.width;
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g_win_h = win.height;
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pixels = win.pixels;
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clamp_scroll();
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render(pixels);
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win.present();
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continue;
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}
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bool redraw = false;
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// Keyboard
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if (ev.type == 0 && ev.key.pressed) {
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auto& key = ev.key;
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// Path bar input
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if (g_pathbar_open) {
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if (key.ascii == '\n' || key.ascii == '\r') {
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if (g_pathbar_text[0]) {
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open_file(g_pathbar_text);
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}
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g_pathbar_open = false;
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} else if (key.scancode == 0x01) {
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g_pathbar_open = false;
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} else if (key.ascii == '\b' || key.scancode == 0x0E) {
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if (g_pathbar_cursor > 0) {
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for (int i = g_pathbar_cursor - 1; i < g_pathbar_len - 1; i++)
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g_pathbar_text[i] = g_pathbar_text[i + 1];
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g_pathbar_len--;
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g_pathbar_cursor--;
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g_pathbar_text[g_pathbar_len] = '\0';
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}
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} else if (key.scancode == 0x4B) {
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if (g_pathbar_cursor > 0) g_pathbar_cursor--;
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} else if (key.scancode == 0x4D) {
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if (g_pathbar_cursor < g_pathbar_len) g_pathbar_cursor++;
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} else if (key.ascii >= 32 && key.ascii < 127 && g_pathbar_len < 254) {
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for (int i = g_pathbar_len; i > g_pathbar_cursor; i--)
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g_pathbar_text[i] = g_pathbar_text[i - 1];
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g_pathbar_text[g_pathbar_cursor] = key.ascii;
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g_pathbar_cursor++;
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g_pathbar_len++;
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g_pathbar_text[g_pathbar_len] = '\0';
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}
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redraw = true;
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goto done_keys;
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}
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// Escape: close
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if (key.scancode == 0x01) {
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break;
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}
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// Ctrl+O: open file
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else if (key.ctrl && (key.ascii == 'o' || key.ascii == 'O' || key.ascii == 15)) {
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open_file_dialog();
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redraw = true;
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}
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// Ctrl+P: print file
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else if (key.ctrl && (key.ascii == 'p' || key.ascii == 'P' || key.ascii == 16)) {
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print_file_dialog();
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redraw = true;
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}
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// Page Down / Right arrow: next page
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else if (key.scancode == 0x51 || key.scancode == 0x4D) {
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if (g_doc.valid) {
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if (key.scancode == 0x4D && g_scroll_y < max_scroll()) {
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// Right arrow scrolls down within page
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} else {
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go_to_page(g_current_page + 1);
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}
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redraw = true;
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}
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}
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// Page Up / Left arrow: previous page
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else if (key.scancode == 0x49 || key.scancode == 0x4B) {
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if (g_doc.valid) {
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if (key.scancode == 0x4B && g_scroll_y > 0) {
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// Left arrow scrolls up within page
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} else {
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go_to_page(g_current_page - 1);
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}
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redraw = true;
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}
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}
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// Up arrow: scroll up
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else if (key.scancode == 0x48) {
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g_scroll_y -= SCROLL_STEP;
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clamp_scroll();
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redraw = true;
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}
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// Down arrow: scroll down
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else if (key.scancode == 0x50) {
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g_scroll_y += SCROLL_STEP;
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clamp_scroll();
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redraw = true;
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}
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// Home: first page
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else if (key.scancode == 0x47) {
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if (g_doc.valid) { go_to_page(0); redraw = true; }
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}
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// End: last page
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else if (key.scancode == 0x4F) {
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if (g_doc.valid) { go_to_page(g_doc.page_count - 1); redraw = true; }
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}
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// Ctrl++ or Ctrl+=: zoom in
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else if (key.ctrl && (key.ascii == '+' || key.ascii == '=')) {
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zoom_in();
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redraw = true;
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}
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// Ctrl+-: zoom out
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else if (key.ctrl && (key.ascii == '-' || key.ascii == '_')) {
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zoom_out();
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redraw = true;
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}
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// Ctrl+0: reset zoom
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else if (key.ctrl && key.ascii == '0') {
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g_zoom = 1.0f;
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clamp_scroll();
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redraw = true;
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}
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}
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done_keys:
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// Mouse
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if (ev.type == 1) {
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int mx = ev.mouse.x;
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int my = ev.mouse.y;
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uint8_t btns = ev.mouse.buttons;
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uint8_t prev = ev.mouse.prev_buttons;
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bool clicked = (btns & 1) && !(prev & 1);
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if (clicked && my < TOOLBAR_H && my >= TB_BTN_Y && my < TB_BTN_Y + TB_BTN_SIZE) {
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if (mx >= TB_OPEN_X0 && mx < TB_OPEN_X1) {
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open_file_dialog();
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redraw = true;
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} else if (mx >= TB_PRINT_X0 && mx < TB_PRINT_X1) {
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print_file_dialog();
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redraw = true;
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} else if (mx >= TB_PREV_X0 && mx < TB_PREV_X1 && g_doc.valid) {
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go_to_page(g_current_page - 1);
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redraw = true;
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} else if (mx >= TB_NEXT_X0 && mx < TB_NEXT_X1 && g_doc.valid) {
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go_to_page(g_current_page + 1);
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redraw = true;
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} else if (mx >= TB_ZOUT_X0 && mx < TB_ZOUT_X1) {
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zoom_out();
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redraw = true;
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} else if (mx >= TB_ZIN_X0 && mx < TB_ZIN_X1) {
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zoom_in();
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redraw = true;
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}
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}
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// Mouse scroll
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if (ev.mouse.scroll != 0) {
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g_scroll_y -= ev.mouse.scroll * SCROLL_STEP;
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clamp_scroll();
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redraw = true;
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}
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}
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if (redraw) {
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render(pixels);
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win.present();
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}
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}
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free_pdf();
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if (g_icon_folder.pixels) svg_free(g_icon_folder);
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if (g_icon_print.pixels) svg_free(g_icon_print);
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win.destroy();
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montauk::exit(0);
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}
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