created proper window, added menu bar, got pixel by pixel control of window

program.cpp

@@ -1,25 +1,170 @@
 #include <iostream>
 #include <string>
+
 #include <gtk/gtk.h>
 
-using namespace std;
+/* Surface to store current scribbles */
+static cairo_surface_t *surface = NULL;
 
-static void activate(GtkApplication* app, gpointer user_data)
+static void clear_surface(void)
 {
-  GtkWidget *window;
+  cairo_t *cr;
 
-  window = gtk_application_window_new(app);
-  gtk_window_set_title (GTK_WINDOW(window), "z80 screen test");
-  gtk_window_set_default_size(GTK_WINDOW(window), 320, 200);
-  gtk_widget_show_all(window);
+  cr = cairo_create(surface);
+  
+  //set to black
+  cairo_set_source_rgb(cr, 0, 0, 0);
+  cairo_paint(cr);
+
+  cairo_destroy(cr);
 }
 
-int main(int argc, char **argv)
+/* Create a new surface of the appropriate size to store our scribbles */
+static gboolean configure_event_cb(GtkWidget         *widget,
+                    GdkEventConfigure *event,
+                    gpointer           data)
+{
+  if(surface)
+  {
+    cairo_surface_destroy(surface);
+}
+
+  surface = gdk_window_create_similar_surface(gtk_widget_get_window(widget),
+                                               CAIRO_CONTENT_COLOR,
+                                               gtk_widget_get_allocated_width(widget),
+                                               gtk_widget_get_allocated_height(widget));
+
+  /* Initialize the surface to white */
+  clear_surface();
+
+  /* We've handled the configure event, no need for further processing. */
+  return TRUE;
+}
+
+/* Redraw the screen from the surface. Note that the ::draw
+ * signal receives a ready-to-be-used cairo_t that is already
+ * clipped to only draw the exposed areas of the widget
+ */
+static gboolean
+draw_cb(GtkWidget *widget,
+         cairo_t   *cr,
+         gpointer   data)
+{
+  cairo_set_source_surface(cr, surface, 0, 0);
+  cairo_paint(cr);
+
+  return FALSE;
+}
+
+/* Draw a rectangle on the surface at the given position */
+static void
+draw_pixel(GtkWidget *widget,
+            gdouble    x,
+            gdouble    y,
+            int        size)
+{
+  cairo_t *cr;
+
+  /* Paint to the surface, where we store our state */
+  cr = cairo_create(surface);
+
+  cairo_set_source_rgb(cr, 1, 1, 1);
+
+  cairo_rectangle(cr, x, y, size, size);
+  cairo_fill(cr);
+
+  cairo_destroy(cr);
+
+  /* Now invalidate the affected region of the drawing area. */
+  gtk_widget_queue_draw_area(widget, x, y, size, size);
+}
+
+
+
+static void
+close_window(void)
+{
+  if(surface)
+    cairo_surface_destroy(surface);
+}
+
+
+
+static void
+activate(GtkApplication *app,
+          gpointer        user_data)
+{
+  GtkWidget *window;
+  GtkWidget *box;
+  GtkWidget *frame;
+  GtkWidget *drawing_area;
+
+  //define menubar things
+  GtkWidget *menubar;
+  GtkWidget *fileMenu;
+  GtkWidget *fileMi;
+  GtkWidget *quitMi;
+
+
+  int zoom = 2;
+
+  window = gtk_application_window_new(app);
+  gtk_window_set_title(GTK_WINDOW(window), "z80 screen test");
+  gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
+
+    g_signal_connect(window, "destroy", G_CALLBACK(close_window), NULL);
+
+
+  gtk_container_set_border_width(GTK_CONTAINER(window), 0);
+
+  box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
+  gtk_container_add(GTK_CONTAINER(window), box);
+
+  
+  menubar = gtk_menu_bar_new();
+  fileMenu = gtk_menu_new();
+
+  fileMi = gtk_menu_item_new_with_label("File");
+  quitMi = gtk_menu_item_new_with_label("Quit");
+
+  gtk_menu_item_set_submenu(GTK_MENU_ITEM(fileMi), fileMenu);
+  gtk_menu_shell_append(GTK_MENU_SHELL(fileMenu), quitMi);
+  gtk_menu_shell_append(GTK_MENU_SHELL(menubar), fileMi);
+  gtk_box_pack_start(GTK_BOX(box), menubar, FALSE, FALSE, 0);
+
+   g_signal_connect(G_OBJECT(quitMi), "activate",
+        G_CALLBACK(gtk_widget_destroy(window)), NULL);
+
+
+  drawing_area = gtk_drawing_area_new();
+  /* set a minimum size */
+  gtk_widget_set_size_request(drawing_area, 320 * zoom, 200 * zoom);
+
+  gtk_box_pack_start(GTK_BOX(box), drawing_area, FALSE, FALSE, 0);
+
+  /* Signals used to handle the backing surface */
+  g_signal_connect(drawing_area, "draw",
+                    G_CALLBACK(draw_cb), NULL);
+  g_signal_connect(drawing_area,"configure-event",
+                    G_CALLBACK(configure_event_cb), NULL);
+
+
+ 
+  gtk_widget_show_all(window);
+
+
+  draw_pixel(drawing_area, 0, 0, zoom);
+  
+}
+
+int
+main(int    argc,
+      char **argv)
 {
   GtkApplication *app;
   int status;
 
-  app = gtk_application_new("org.gtk.example", G_APPLICATION_FLAGS_NONE);
+  app = gtk_application_new("com.github.amberisvibin.z80screentest", G_APPLICATION_FLAGS_NONE);
   g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
   status = g_application_run(G_APPLICATION(app), argc, argv);
   g_object_unref(app);