Merci Adrien pour l'explication des pointeurs sur fonctions. Ça marche

hot.c

@@ -35,6 +35,14 @@ static void add_child_node (struct TreeNode_t *parent, struct TreeNode_t *child)
     } else parent->child = child;
 }
 
+void on_experimental_tree_expander_toggled(GtkExpander *expander, gpointer user_data)
+{
+    // This is a conceptual callback for when an expander is toggled
+    GtkTreeListRow *row = GTK_TREE_LIST_ROW(user_data);
+    gboolean is_expanded = gtk_tree_list_row_get_expanded(row);
+    gtk_tree_list_row_set_expanded(row, !is_expanded);
+}
+
 static void on_experimental_tree_bind_factory (GtkSignalListItemFactory *factory, GObject* object, gpointer user_data){
     GtkListItem *list_item = GTK_LIST_ITEM (object);
     GtkTreeListRow *row = gtk_list_item_get_item (list_item);
@@ -42,8 +50,8 @@ static void on_experimental_tree_bind_factory (GtkSignalListItemFactory *factory
         const gchar *text = gtk_string_object_get_string (GTK_STRING_OBJECT (gtk_tree_list_row_get_item (row)));
         GtkWidget *expander = gtk_list_item_get_child (list_item);
         gtk_expander_set_label (GTK_EXPANDER (expander), text);
-        // g_signal_handlers_disconnect_by_func(expander, G_CALLBACK(on_tree_expander_toggled), row);
+        g_signal_handlers_disconnect_by_func(expander, G_CALLBACK(on_experimental_tree_expander_toggled), row);
-        // g_signal_connect(expander, "activate", G_CALLBACK(on_tree_expander_toggled), row);
+        g_signal_connect(expander, "activate", G_CALLBACK(on_experimental_tree_expander_toggled), row);
         gtk_widget_set_margin_start(expander, gtk_tree_list_row_get_depth(row)*20);
         gboolean is_expanded = gtk_tree_list_row_get_expanded(row);
         printf("[on_experimental_tree_bind_factory] row content is [%s] and expander is [%d]\n", text, is_expanded);
@@ -57,10 +65,10 @@ void on_experimental_tree_setup_factory (GtkSignalListItemFactory *factory,
     printf("[on_experimental_tree_setup_factory] here is an expander\n");
 }
 
-static GListModel* get_experimental_tree_children_model (struct TreeNode_t *parent){
+static GListModel* get_experimental_tree_model_child (struct TreeNode_t *parent){
     GtkStringList *list = NULL;
     if (parent) {
-        printf("[get_experimental_tree_children_model] here is %s content : ", parent->text);
+        printf("[get_experimental_tree_model_child] here is %s content : ", parent->text);
         struct TreeNode_t *child = parent->child;
         if (child) {list = gtk_string_list_new(NULL);}
         while(child) {
@@ -73,7 +81,7 @@ static GListModel* get_experimental_tree_children_model (struct TreeNode_t *pare
     return G_LIST_MODEL(list);
 }
 
-static GListModel* experimental_tree_create_model (GObject *item, gpointer root){
+GListModel* create_experimental_tree_model (GObject *item, gpointer root){
     struct TreeNode_t *cur = (struct TreeNode_t *)root;
     struct TreeNode_t *parent = root;
     const gchar *string =  gtk_string_object_get_string (GTK_STRING_OBJECT(item));
@@ -83,11 +91,12 @@ static GListModel* experimental_tree_create_model (GObject *item, gpointer root)
         cur = cur->next;
         if (cur == NULL) {cur = parent->child; parent = cur;}
     }
-    printf("[experimental_tree_create_model] looked for %s in %s item\n", cur->text, string);
+    printf("[create_experimental_tree_model] looked for %s in %s item\n", cur->text, string);
-    return get_experimental_tree_children_model (cur);
+    return get_experimental_tree_model_child (cur);
 }
 
 void create_experimental_tree (GtkBox *experimental_box){
+    GtkScrolledWindow *scrolled_window;
     struct TreeNode_t *tree_root = create_tree_node("hello");
     struct TreeNode_t *it_s_me   = create_tree_node("it's me");   add_child_node(tree_root, it_s_me);
     struct TreeNode_t *remember  = create_tree_node("remember");  add_child_node(it_s_me, remember);
@@ -97,13 +106,15 @@ void create_experimental_tree (GtkBox *experimental_box){
     GtkSignalListItemFactory *factory = GTK_SIGNAL_LIST_ITEM_FACTORY (gtk_signal_list_item_factory_new());
     g_signal_connect (factory, "setup", G_CALLBACK(on_experimental_tree_setup_factory), NULL);
     g_signal_connect (factory, "bind", G_CALLBACK(on_experimental_tree_bind_factory), NULL);
+
+//    GListModel *a_test = create_experimental_tree_model(G_OBJECT (model), tree_root);
     printf(">  %s > %s > %s\n", tree_root->text, it_s_me->text, remember->text);
 
     GtkTreeListModel *tree_model = gtk_tree_list_model_new(
         G_LIST_MODEL (model),
         FALSE, // Passthrough - False in actual usage with dynamic children retrieval
         FALSE, // autoexpand
-        (GtkTreeListModelCreateModelFunc) experimental_tree_create_model,
+        (GtkTreeListModelCreateModelFunc) &create_experimental_tree_model,
         tree_root,
         NULL // (GDestroyNotify) free_tree_node
     );
@@ -115,7 +126,17 @@ void create_experimental_tree (GtkBox *experimental_box){
     GtkWidget *list_view = gtk_list_view_new (GTK_SELECTION_MODEL (selection_model),
                                               GTK_LIST_ITEM_FACTORY (factory));
 
-    gtk_box_append(experimental_box, list_view);
+    scrolled_window = GTK_SCROLLED_WINDOW (gtk_scrolled_window_new());
+    gtk_scrolled_window_set_child(scrolled_window, list_view);
+
+    gtk_scrolled_window_set_policy (scrolled_window,
+                                    GTK_POLICY_AUTOMATIC,
+                                    GTK_POLICY_AUTOMATIC);
+    gtk_widget_set_vexpand(GTK_WIDGET(scrolled_window), TRUE);
+
+    gtk_box_append(GTK_BOX(experimental_box), GTK_WIDGET(scrolled_window));
+    gtk_widget_set_visible(GTK_WIDGET(scrolled_window), TRUE);
+    gtk_widget_set_visible(GTK_WIDGET(list_view), TRUE);
 
 //    gtk_widget_set_visible(GTK_WIDGET(experimental_box), TRUE);
 //    gtk_widget_set_visible(GTK_WIDGET(list_view), TRUE);

warm.c

@@ -7,6 +7,47 @@
 #include "texts.h"
 
 //  https://docs.gtk.org/gtk4/visual_index.html  <  widgets gallery
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+//typedef anytype = {(int)(*fnct) {printf("typedef {(int)(*fnct) {printf("");}");} GtkModelFnct;
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 GtkFrame *get_frame_with_label(){ //  EN ATTENDANT DE SAVOIR UTILISER :  GtkTextTagTable  et   GtkTextBuffer
   GtkFrame *space_specif = GTK_FRAME(gtk_frame_new ("Space (run / edit) specifications"));