feat: PDF viewer

2026-03-06 08:00:57 +01:00
parent c4690fd451
commit 1f5d966030
12 changed files with 3127 additions and 17 deletions
@@ -0,0 +1,329 @@
+/*
+ * main.cpp
+ * PDF Viewer app -- global state, entry point, event loop
+ * Copyright (c) 2026 Daniel Hammer
+ */
+
+#include "pdfviewer.h"
+
+// ============================================================================
+// Global state definitions
+// ============================================================================
+
+int g_win_w = INIT_W;
+int g_win_h = INIT_H;
+
+PdfDoc g_doc = {};
+
+int g_current_page = 0;
+int g_scroll_y = 0;
+float g_zoom = 1.0f;
+
+char g_filepath[256] = {};
+
+bool g_pathbar_open = false;
+char g_pathbar_text[256] = {};
+int  g_pathbar_len = 0;
+int  g_pathbar_cursor = 0;
+
+TrueTypeFont* g_font = nullptr;
+TrueTypeFont* g_font_bold = nullptr;
+TrueTypeFont* g_font_mono = nullptr;
+
+char g_status_msg[128] = {};
+
+// ============================================================================
+// Toolbar hit-testing constants
+// ============================================================================
+
+// Toolbar buttons: Open | < > | - +
+static constexpr int TB_OPEN_X0 = 4, TB_OPEN_X1 = 40;
+// separator at 48
+static constexpr int TB_PREV_X0 = 56, TB_PREV_X1 = 80;
+static constexpr int TB_NEXT_X0 = 84, TB_NEXT_X1 = 108;
+// separator at 116
+static constexpr int TB_ZOUT_X0 = 124, TB_ZOUT_X1 = 148;
+static constexpr int TB_ZIN_X0  = 152, TB_ZIN_X1  = 176;
+
+// ============================================================================
+// Helpers
+// ============================================================================
+
+static int max_scroll() {
+    if (!g_doc.valid || g_current_page >= g_doc.page_count) return 0;
+    PdfPage* page = &g_doc.pages[g_current_page];
+    int page_h = (int)(page->height * g_zoom) + PAGE_MARGIN * 2;
+    int pathbar_h = g_pathbar_open ? PATHBAR_H : 0;
+    int content_h = g_win_h - TOOLBAR_H - pathbar_h - STATUS_BAR_H;
+    int ms = page_h - content_h;
+    return ms > 0 ? ms : 0;
+}
+
+static void clamp_scroll() {
+    int ms = max_scroll();
+    if (g_scroll_y < 0) g_scroll_y = 0;
+    if (g_scroll_y > ms) g_scroll_y = ms;
+}
+
+static void go_to_page(int page) {
+    if (page < 0) page = 0;
+    if (page >= g_doc.page_count) page = g_doc.page_count - 1;
+    g_current_page = page;
+    g_scroll_y = 0;
+}
+
+static void zoom_in() {
+    if (g_zoom < 4.0f) {
+        g_zoom += 0.25f;
+        clamp_scroll();
+    }
+}
+
+static void zoom_out() {
+    if (g_zoom > 0.25f) {
+        g_zoom -= 0.25f;
+        clamp_scroll();
+    }
+}
+
+static void open_file(const char* path) {
+    str_cpy(g_filepath, path, 256);
+    g_current_page = 0;
+    g_scroll_y = 0;
+
+    if (load_pdf(path)) {
+        // Success
+    } else {
+        g_filepath[0] = '\0';
+    }
+}
+
+// ============================================================================
+// Entry point
+// ============================================================================
+
+extern "C" void _start() {
+    // Load fonts
+    auto load_font = [](const char* path) -> TrueTypeFont* {
+        TrueTypeFont* f = (TrueTypeFont*)montauk::malloc(sizeof(TrueTypeFont));
+        if (!f) return nullptr;
+        montauk::memset(f, 0, sizeof(TrueTypeFont));
+        if (!f->init(path)) { montauk::mfree(f); return nullptr; }
+        return f;
+    };
+    g_font = load_font("0:/fonts/Roboto-Medium.ttf");
+    g_font_bold = load_font("0:/fonts/Roboto-Bold.ttf");
+    g_font_mono = load_font("0:/fonts/JetBrainsMono-Regular.ttf");
+
+    // Check for file argument
+    char args[512] = {};
+    int arglen = montauk::getargs(args, sizeof(args));
+    if (arglen > 0 && args[0]) {
+        open_file(args);
+    }
+
+    // Build window title
+    char title[64] = "PDF Viewer";
+    if (g_filepath[0]) {
+        const char* fname = g_filepath;
+        for (int i = 0; g_filepath[i]; i++)
+            if (g_filepath[i] == '/') fname = g_filepath + i + 1;
+        snprintf(title, 64, "%s - PDF Viewer", fname);
+    }
+
+    // Create window
+    Montauk::WinCreateResult wres;
+    if (montauk::win_create(title, INIT_W, INIT_H, &wres) < 0 || wres.id < 0)
+        montauk::exit(1);
+
+    int win_id = wres.id;
+    uint32_t* pixels = (uint32_t*)(uintptr_t)wres.pixelVa;
+
+    render(pixels);
+    montauk::win_present(win_id);
+
+    while (true) {
+        Montauk::WinEvent ev;
+        int r = montauk::win_poll(win_id, &ev);
+
+        if (r < 0) break;
+
+        if (r == 0) {
+            montauk::sleep_ms(16);
+            continue;
+        }
+
+        // Close
+        if (ev.type == 3) break;
+
+        // Resize
+        if (ev.type == 2) {
+            g_win_w = ev.resize.w;
+            g_win_h = ev.resize.h;
+            pixels = (uint32_t*)(uintptr_t)montauk::win_resize(win_id, g_win_w, g_win_h);
+            clamp_scroll();
+            render(pixels);
+            montauk::win_present(win_id);
+            continue;
+        }
+
+        bool redraw = false;
+
+        // Keyboard
+        if (ev.type == 0 && ev.key.pressed) {
+            auto& key = ev.key;
+
+            // Path bar input
+            if (g_pathbar_open) {
+                if (key.ascii == '\n' || key.ascii == '\r') {
+                    if (g_pathbar_text[0]) {
+                        open_file(g_pathbar_text);
+                    }
+                    g_pathbar_open = false;
+                } else if (key.scancode == 0x01) {
+                    g_pathbar_open = false;
+                } else if (key.ascii == '\b' || key.scancode == 0x0E) {
+                    if (g_pathbar_cursor > 0) {
+                        for (int i = g_pathbar_cursor - 1; i < g_pathbar_len - 1; i++)
+                            g_pathbar_text[i] = g_pathbar_text[i + 1];
+                        g_pathbar_len--;
+                        g_pathbar_cursor--;
+                        g_pathbar_text[g_pathbar_len] = '\0';
+                    }
+                } else if (key.scancode == 0x4B) {
+                    if (g_pathbar_cursor > 0) g_pathbar_cursor--;
+                } else if (key.scancode == 0x4D) {
+                    if (g_pathbar_cursor < g_pathbar_len) g_pathbar_cursor++;
+                } else if (key.ascii >= 32 && key.ascii < 127 && g_pathbar_len < 254) {
+                    for (int i = g_pathbar_len; i > g_pathbar_cursor; i--)
+                        g_pathbar_text[i] = g_pathbar_text[i - 1];
+                    g_pathbar_text[g_pathbar_cursor] = key.ascii;
+                    g_pathbar_cursor++;
+                    g_pathbar_len++;
+                    g_pathbar_text[g_pathbar_len] = '\0';
+                }
+                redraw = true;
+                goto done_keys;
+            }
+
+            // Escape: close
+            if (key.scancode == 0x01) {
+                break;
+            }
+            // Ctrl+O: open file
+            else if (key.ctrl && (key.ascii == 'o' || key.ascii == 'O' || key.ascii == 15)) {
+                g_pathbar_open = true;
+                g_pathbar_text[0] = '\0';
+                g_pathbar_len = 0;
+                g_pathbar_cursor = 0;
+                redraw = true;
+            }
+            // Page Down / Right arrow: next page
+            else if (key.scancode == 0x51 || key.scancode == 0x4D) {
+                if (g_doc.valid) {
+                    if (key.scancode == 0x4D && g_scroll_y < max_scroll()) {
+                        // Right arrow scrolls down within page
+                    } else {
+                        go_to_page(g_current_page + 1);
+                    }
+                    redraw = true;
+                }
+            }
+            // Page Up / Left arrow: previous page
+            else if (key.scancode == 0x49 || key.scancode == 0x4B) {
+                if (g_doc.valid) {
+                    if (key.scancode == 0x4B && g_scroll_y > 0) {
+                        // Left arrow scrolls up within page
+                    } else {
+                        go_to_page(g_current_page - 1);
+                    }
+                    redraw = true;
+                }
+            }
+            // Up arrow: scroll up
+            else if (key.scancode == 0x48) {
+                g_scroll_y -= SCROLL_STEP;
+                clamp_scroll();
+                redraw = true;
+            }
+            // Down arrow: scroll down
+            else if (key.scancode == 0x50) {
+                g_scroll_y += SCROLL_STEP;
+                clamp_scroll();
+                redraw = true;
+            }
+            // Home: first page
+            else if (key.scancode == 0x47) {
+                if (g_doc.valid) { go_to_page(0); redraw = true; }
+            }
+            // End: last page
+            else if (key.scancode == 0x4F) {
+                if (g_doc.valid) { go_to_page(g_doc.page_count - 1); redraw = true; }
+            }
+            // Ctrl++ or Ctrl+=: zoom in
+            else if (key.ctrl && (key.ascii == '+' || key.ascii == '=')) {
+                zoom_in();
+                redraw = true;
+            }
+            // Ctrl+-: zoom out
+            else if (key.ctrl && (key.ascii == '-' || key.ascii == '_')) {
+                zoom_out();
+                redraw = true;
+            }
+            // Ctrl+0: reset zoom
+            else if (key.ctrl && key.ascii == '0') {
+                g_zoom = 1.0f;
+                clamp_scroll();
+                redraw = true;
+            }
+        }
+        done_keys:
+
+        // Mouse
+        if (ev.type == 1) {
+            int mx = ev.mouse.x;
+            int my = ev.mouse.y;
+            uint8_t btns = ev.mouse.buttons;
+            uint8_t prev = ev.mouse.prev_buttons;
+            bool clicked = (btns & 1) && !(prev & 1);
+
+            if (clicked && my < TOOLBAR_H && my >= TB_BTN_Y && my < TB_BTN_Y + TB_BTN_SIZE) {
+                if (mx >= TB_OPEN_X0 && mx < TB_OPEN_X1) {
+                    g_pathbar_open = true;
+                    g_pathbar_text[0] = '\0';
+                    g_pathbar_len = 0;
+                    g_pathbar_cursor = 0;
+                    redraw = true;
+                } else if (mx >= TB_PREV_X0 && mx < TB_PREV_X1 && g_doc.valid) {
+                    go_to_page(g_current_page - 1);
+                    redraw = true;
+                } else if (mx >= TB_NEXT_X0 && mx < TB_NEXT_X1 && g_doc.valid) {
+                    go_to_page(g_current_page + 1);
+                    redraw = true;
+                } else if (mx >= TB_ZOUT_X0 && mx < TB_ZOUT_X1) {
+                    zoom_out();
+                    redraw = true;
+                } else if (mx >= TB_ZIN_X0 && mx < TB_ZIN_X1) {
+                    zoom_in();
+                    redraw = true;
+                }
+            }
+
+            // Mouse scroll
+            if (ev.mouse.scroll != 0) {
+                g_scroll_y -= ev.mouse.scroll * SCROLL_STEP;
+                clamp_scroll();
+                redraw = true;
+            }
+        }
+
+        if (redraw) {
+            render(pixels);
+            montauk::win_present(win_id);
+        }
+    }
+
+    free_pdf();
+    montauk::win_destroy(win_id);
+    montauk::exit(0);
+}