How to expand the GTK window containing a really tiny GRID inside a scrolled window? - gtk

Question

I have a code containing GTK entries in a GRID, my goal is to append them into the GRID to make a table of values, something like a "spreadsheet". The entries are in the GRID, and the GRID is in a GTK Scrolled window, which is in the main window.
Yet, I am not getting the expected result. The GRID is really tiny, it can be expanded.
Here is what I am getting (image):
Here is what I want (image):
Here is my code:
#include <gtk/gtk.h>
int main(int argc, char **argv){
gtk_init(&argc, &argv);
GtkWidget *mainwindow;
mainwindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(mainwindow), "Example");
g_signal_connect(mainwindow, "destroy", G_CALLBACK(gtk_main_quit), NULL);
int n = 5;
GtkWidget *entries[n][n];
GtkWidget *grid;
GtkWidget *scrolledwindow;
grid = gtk_grid_new();
gtk_grid_set_row_spacing(GTK_GRID(grid), 5);
gtk_grid_set_column_spacing(GTK_GRID(grid), 3);
scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
for(int i = 0; i < n; i++){
for(int j = 0; j < n; j++){
entries[i][j] = gtk_entry_new();
gtk_grid_attach(GTK_GRID(grid), entries[i][j], i, j, 1, 1);
}
}
gtk_container_add(GTK_CONTAINER(scrolledwindow), grid);
gtk_container_add(GTK_CONTAINER(mainwindow), scrolledwindow);
gtk_widget_show_all(mainwindow);
gtk_main();
return 0;
}
Searching in the internet, I have found this problem:
Gtk scroll window size in a grid, but it's in Python, and I don't know, but NULL and NULL, what values I must atribute to a and b in this command: gtk_scrolled_window_new(a, b);

Answer 1

You can use the gtk_scrolled_window_set_propagate_natural_width and gtk_scrolled_window_set_propagate_natural_height functions from GtkScrolledWindow.
For example, in your snippet:
// ...
scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
// Use the child widget's natural dimensions when requesting the scrollwindow's
// own natural size:
gtk_scrolled_window_set_propagate_natural_width(GTK_SCROLLED_WINDOW(scrolledwindow), true);
gtk_scrolled_window_set_propagate_natural_height(GTK_SCROLLED_WINDOW(scrolledwindow), true);
for(int i = 0; i < n; i++){
// ...