I am seeing this warning when expanding a TreeStore when the expanded height exceeds the size of the window. I'm attaching a minimal but complete program that exhibits this.
If there's something I'm missing, I'd appreciate anu pointers, but it seems that this is a bug of sorts. I've Googled this and saw some cases where it was a bug in the application programming, and were corrected, but most of these programs do explicitly allocate the size.
In the attached file, I did nothing to attempt to resize the window (the warning definitely refers to the toplevel window).
This occurs on all the systems on which I've tried it - Windows compiled under MinGW, Debian testing, Arch Linux, Linux Mint, and Ubuntu. All these systems have some flavor of Gtk 3.22.
Also note that on my tests, if List 2 (the lower iter) is expanded first and the expanded size does not exceed the height of the window, and then List 1 is expanded, the warning is not displayed.
Seemingly, this is only a harmless warning, but it is a bit disconcerting to see it. FWIW, even Glade (at least v 3.20) emits this warning when the widget hierarchy is expanded.
/* program to test the get_preferred_height warning */
#include <gtk/gtk.h>
GtkWidget *w_main,
*main_treeview;
char *list1[][2] = {
{"l1_1a", "l1_1b"},
{"l1_2a", "l1_2b"},
{"l1_3a", "l1_3b"},
{"l1_4a", "l1_4b"},
{NULL, NULL}
};
char *list2[][2] = {
{"l2_1a", "l2_1b"},
{"l2_2a", "l2_2b"},
{"l2_3a", "l2_3b"},
{"l2_4a", "l2_4b"},
{"l2_5a", "l2_5b"},
{NULL, NULL}
};
void
kill_wmain (GtkWidget *win, GdkEventAny *event)
{
gtk_main_quit();
}
void
populate_list (char *ttl, char *list[][2])
{
GtkTreeModel *model_main = gtk_tree_view_get_model (
GTK_TREE_VIEW(main_treeview));
GtkTreeIter topitr;
char **row;
gtk_tree_store_append (GTK_TREE_STORE(model_main), &topitr, NULL);
gtk_tree_store_set (GTK_TREE_STORE(model_main), &topitr, 0, ttl, -1);
while (*(row = *(list++)))
{
int c;
GtkTreeIter childitr;
gtk_tree_store_append(GTK_TREE_STORE(model_main), &childitr, &topitr);
gtk_tree_store_set (GTK_TREE_STORE(model_main), &childitr,
0, row[0], 1, row[1], -1);
}
}
GtkWidget *
new_treestore (GtkWidget *parent, char *wtype)
{
GtkTreeStore *model;
GtkWidget *treeview;
char *titles[] = {"Col1", "Col2"};
GtkWidget *wscrolledwindow = gtk_scrolled_window_new (NULL, NULL);
int x;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW(wscrolledwindow),
GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_box_pack_start (GTK_BOX(parent), wscrolledwindow, FALSE, TRUE, 5);
// Just use 'tree' for wtype
model = gtk_tree_store_new (2, G_TYPE_STRING, G_TYPE_STRING);
treeview = gtk_tree_view_new ();
gtk_tree_view_set_model (GTK_TREE_VIEW(treeview), GTK_TREE_MODEL(model));
gtk_widget_set_hexpand (treeview, TRUE);
gtk_widget_set_vexpand (treeview, TRUE);
for (x = 0; x < 2; x++)
{
gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW(treeview),
x, titles[x], gtk_cell_renderer_text_new(), "text", x, NULL);
}
gtk_container_add (GTK_CONTAINER(wscrolledwindow), treeview);
return treeview;
}
int
main (int argc, char **argv)
{
GtkWidget *vbox;
GtkTreeIter *iter = NULL;
gtk_init (&argc, &argv);
w_main = gtk_window_new (GTK_WINDOW_TOPLEVEL);
printf ("\nw_main: %x\n",w_main);
g_signal_connect (w_main, "delete-event", G_CALLBACK(kill_wmain), NULL);
gtk_window_set_default_size (GTK_WINDOW(w_main), 300, 200);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
main_treeview = new_treestore (vbox, "tree");
printf ("main_treeview: %x\n",main_treeview);
gtk_tree_selection_set_mode (gtk_tree_view_get_selection (
GTK_TREE_VIEW(main_treeview)), GTK_SELECTION_SINGLE);
populate_list ("List 1", list1);
populate_list ("List 2", list2);
gtk_container_add (GTK_CONTAINER(w_main), vbox);
gtk_widget_show_all (w_main);
gtk_main ();
return 0;
}
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