GTK4_GG_hack/hot.h

#include <stdio.h>
#include <gtk-4.0/gtk/gtk.h>
#include "warm.h"
#include "cold.h"

void activate (GtkApplication *app, gpointer user_data) {
  GtkWindow *window   = GTK_WINDOW (gtk_application_window_new (app));
  window_bar (window, "window");
  GtkWidget *grid     = gtk_grid_new();
  gtk_window_set_child (window, grid);

  click_print_do (NULL,   grid, "(I)",  "n°1\n",   0,0,1,1);
  click_print_do (NULL,   grid, "(II)", "n°2\n",   1,0,1,1);
  click_print_do (window, grid, "Quit", "bye !\n", 2,0,1,2);

  GtkWidget *switcher = gtk_stack_switcher_new();
//  GtkWidget *sidebar  = gtk_stack_sidebar_new();
  gtk_grid_attach (GTK_GRID (grid), switcher, 0, 2, 2, 1);
  gtk_orientable_set_orientation (GTK_ORIENTABLE (switcher), GTK_ORIENTATION_VERTICAL);
  gtk_orientable_set_orientation (GTK_ORIENTABLE (switcher), GTK_ORIENTATION_HORIZONTAL);
  GtkStack *stack = GTK_STACK (gtk_stack_new());
  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (switcher), stack);
//  gtk_stack_sidebar_set_stack (GTK_STACK_SIDEBAR (sidebar), stack);

  GtkWidget *page_0   = gtk_paned_new(GTK_ORIENTATION_VERTICAL);
  GtkWidget *page_1   = gtk_paned_new(GTK_ORIENTATION_VERTICAL);
  gtk_stack_add_titled (stack, page_0, "n°0", "A");
  gtk_stack_add_titled (stack, page_1, "n°1", "B");

  GtkWidget *box_1    = gtk_box_new (0, 6); // 6 = spacing

  GtkStackPage *page_2 =  gtk_stack_add_titled (stack, box_1, "any name", "C");
  gtk_stack_page_set_name (page_2, "n°2");

  printf("selected page name is [%s]  (how do I get its title ?)\n",
          gtk_stack_get_visible_child_name (stack));

  GtkSelectionModel *stack_selection_model = gtk_stack_get_pages (stack);
  gtk_selection_model_select_item (stack_selection_model, 2, 1);

//  gtk_stack_set_transition_type (GTK_STACK (stack), GTK_STACK_TRANSITION_TYPE_CROSSFADE);

  gtk_window_present (GTK_WINDOW (window));
}