Gtk 4

#include <time.h>
#include <cairo.h>
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkkeysyms.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

int flag = 0;
char str[500], str2[500], str3[500], str4[500], str5[500], slide[500];
GtkContainer *box;
GtkWidget *window, *vbox;
GtkWidget *menubar, *filemenu, *help, *helpmenu;
GtkWidget *file, *quit, *open, *save, *properties, *about, *slideshow;
GtkWidget *img, *img2;
GtkWidget *dialog;
GtkRequisition *allocator;

void wait(double seconds)
{
    clock_t lol;
    lol = clock() + (seconds * CLOCKS_PER_SEC);
    while(clock() < lol) {}
}

void create_menu()
{
    vbox = gtk_vbox_new(FALSE, 0);
    box = gtk_vbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(box), vbox, TRUE, TRUE, 0);
    menubar = gtk_menu_bar_new();
    filemenu = gtk_menu_new();

    file = gtk_menu_item_new_with_label("File");
    quit = gtk_menu_item_new_with_label("Quit                             Ctrl + Q");
    open = gtk_menu_item_new_with_label("Open                           Ctrl + O");
    save = gtk_menu_item_new_with_label("Save");
    slideshow = gtk_menu_item_new_with_label("Start Slide");
    properties = gtk_menu_item_new_with_label("Properties                   Ctrl + P");

    gtk_menu_item_set_submenu(GTK_MENU_ITEM(file), filemenu);
    gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), open);
    gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), save);
    gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), slideshow);
    gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), properties);
    gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), quit);
    gtk_menu_shell_append(GTK_MENU_SHELL(menubar), file);

    helpmenu = gtk_menu_new();
    about = gtk_menu_item_new_with_label("About");
    help = gtk_menu_item_new_with_label("Help");
    gtk_menu_item_set_submenu(GTK_MENU_ITEM(help), helpmenu);
    gtk_menu_shell_append(GTK_MENU_SHELL(helpmenu), about);
    gtk_menu_shell_append(GTK_MENU_SHELL(menubar), help);
    gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 0);
}

void show_about()
{
    GtkWidget *dialog;
    const char *author[] = {"None yet\n(However, Special thanks to Mehedi Hasan and\nShadman Shadab :-) )",NULL};
    dialog = gtk_about_dialog_new();
    gtk_about_dialog_set_program_name (GTK_ABOUT_DIALOG(dialog),"You just clicked about!");
    gtk_about_dialog_set_authors (GTK_ABOUT_DIALOG(dialog),author);
    gtk_about_dialog_set_comments (GTK_ABOUT_DIALOG(dialog),"Good job and go to hell!!");
    gtk_window_set_position(GTK_WINDOW(dialog),GTK_WIN_POS_CENTER);
    gtk_dialog_run(GTK_DIALOG(dialog));
}

void open_file()
{
    dialog = gtk_file_chooser_dialog_new ("Open File",window,GTK_FILE_CHOOSER_ACTION_OPEN,GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,NULL);
    if (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_ACCEPT)
    {
        char *filename;
        filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
        strcpy(slide, filename);
        get_list(filename);
        gtk_container_remove(GTK_CONTAINER(box), img);
        img = gtk_image_new_from_file(filename);
        gtk_widget_show(img);
        gtk_box_pack_start(GTK_BOX(box), img, TRUE, TRUE, 0);
        g_free (filename);
    }
    gtk_widget_destroy (dialog);
}

static int keyboard_keys(GtkWidget *futile, GdkEventKey *lol, gpointer user_data)
{
    if (lol->state == GDK_CONTROL_MASK && (lol->keyval == GDK_KEY_q || lol->keyval == GDK_KEY_Q))
        exit (0x0);
    if (lol->state == GDK_CONTROL_MASK && (lol->keyval == GDK_KEY_O || lol->keyval == GDK_KEY_o))
        open_file();
    if (lol->state == GDK_CONTROL_MASK && (lol->keyval == GDK_KEY_P || lol->keyval == GDK_KEY_p))
        show_properties();
    return TRUE;
}

void show_properties()
{

}

void get_list(char filename[500])
{
    if (flag == 1) system(str2);
    int k = 0, j, l = 0, x;
    int len = strlen(filename);
    for (j = len - 1; filename[j] != '\\'; j--) x = 1;
    str[0] = 0, flag = 1;
    strcat(str, "CD ");
    for (k = 0; k < j; k++) str4[l++] = filename[k];
    str4[l] = 0;
    str3[0] = filename[0], str3[1] = filename[1], str3[2] = 0;
    system(str3);
    strcat(str, str4);
    strcpy(str2, str);
    strcat(str, " && dir /b >> dir_listing.txt");
    strcat(str2, " && del dir_listing.txt");
    system(str);
    strcat(str4, "\\dir_listing.txt");
}

void start_slide()
{
    FILE *input;
    input = fopen(str4, "r");
    int i, j, k, l = 0, len, flag2 = 0;
    for (; ;)
    {
        if (fscanf(input, "%[^\n]", str3) == EOF) break;
        l = 0, len = strlen(slide), fgetc(input);
        for (j = len - 1; slide[j] != '\\'; j--) i = 1;
        for (k = 0; k <= j; k++) str5[l++] = slide[k];
        str5[l] = 0;
        strcat(str5, str3);
        if (flag2 == 1)
        {
            puts(str5);
            wait(3.0);
            gtk_container_remove(GTK_CONTAINER(box), img);
            img = gtk_image_new_from_file(str5);
            gtk_box_pack_start(GTK_BOX(box), img, TRUE, TRUE, 0);
            gtk_widget_show(img);
            g_free (str5);
        }
        if (strcmp(str5, slide) == 0) flag2 = 1;
    }
    fclose(input);
    system(str2);
}

int main(int argc, char *argv[])
{
    GdkScreen *screen;
    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
    gtk_window_set_default_size(GTK_WINDOW(window), 800, 500);
    gtk_window_set_title(GTK_WINDOW(window), "Fireflight Image Viewer 1.052");

    create_menu();
    char filename[] = "C:\\Users\\Public\\Pictures\\Sample Pictures\\BHAIA.png";
    img = gtk_image_new_from_file(filename);
    strcpy(slide, filename);
    gtk_box_pack_start(GTK_BOX(box), img, TRUE, TRUE, 0);
    gtk_container_add(GTK_CONTAINER(window), box);
    get_list(filename);

    g_signal_connect(G_OBJECT(window), "delete-event",G_CALLBACK(gtk_main_quit), NULL);
    g_signal_connect(G_OBJECT(open), "activate", G_CALLBACK(open_file), NULL);
    g_signal_connect(G_OBJECT(properties), "activate", G_CALLBACK(show_properties), NULL);
    g_signal_connect(G_OBJECT(about), "activate", G_CALLBACK(show_about), NULL);
    g_signal_connect(G_OBJECT(quit), "activate",G_CALLBACK(gtk_main_quit), NULL);
    g_signal_connect(G_OBJECT(slideshow), "activate",G_CALLBACK(start_slide), NULL);
    g_signal_connect(G_OBJECT(window), "key_press_event", G_CALLBACK(keyboard_keys), (gpointer)window);
    gtk_widget_show_all(window);
    gtk_main();

    return 0x0;
}