On 07-07-2018 11:00, Eduardo M KALINOWSKI wrote:
> On 05-07-2018 11:02, Eduardo M KALINOWSKI wrote:
>> Consider the sample attached: it builds a tree model with an item that
>> has child items, and uses that model in a ComboBox.
>>
>> When compiled with Gtk2, when the item with children is selected and
>> its children displayed, and extra item representing the parent is
>> added to the top, allowing the parent to be selected. The attached
>> image should make that clearer.
>>
>> However, compiled with Gtk3, that item that allows selection of the
>> parent is missing, as the other image shows.
>>
>> So how does one select "Item with children", using the mouse, under
>> Gtk3? The item can be selected using the keyboard, but apparently with
>> the mouse. Is there a way to get the Gtk2 behaviour back with Gtk3?
> The attachments didn't make it, so here's the code:
>
> ----
> #include <gtk/gtk.h>
>
> GtkTreeModel *create_model()
> {
> GtkTreeStore *model;
> GtkTreeIter iter, child;
>
> model = gtk_tree_store_new(1, G_TYPE_STRING);
>
> gtk_tree_store_append(model, &iter, NULL);
> gtk_tree_store_set(model, &iter, 0, "Item with no children", -1);
>
> gtk_tree_store_append(model, &iter, NULL);
> gtk_tree_store_set(model, &iter, 0, "Item with children", -1);
>
> gtk_tree_store_append(model, &child, &iter);
> gtk_tree_store_set(model, &child, 0, "Child 1", -1);
>
> gtk_tree_store_append(model, &child, &iter);
> gtk_tree_store_set(model, &child, 0, "Child 2", -1);
>
> return GTK_TREE_MODEL(model);
> }
>
>
> void on_changed(GtkComboBox *widget, gpointer data)
> {
> GtkComboBox *combo = widget;
> GtkTreeIter iter;
> gchar *selected_text;
>
> if (gtk_combo_box_get_active_iter(combo, &iter)) {
> gtk_tree_model_get(gtk_combo_box_get_model(combo), &iter,
> 0, &selected_text, -1);
> printf("Selected: %s\n", selected_text);
> }
> }
>
>
> GtkWidget *create_combo(GtkTreeModel *model)
> {
> GtkWidget *combo;
> GtkCellRenderer *column;
>
> combo = gtk_combo_box_new_with_model(model);
> g_object_unref(model);
>
> column = gtk_cell_renderer_text_new();
> gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combo), column, TRUE);
> gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(combo), column,
> "text", 0, NULL);
>
> g_signal_connect(combo, "changed", G_CALLBACK(on_changed), NULL);
>
> return combo;
> }
>
>
> int main(int argc, char **argv)
> {
> GtkWidget *window, *combo;
> GtkTreeModel *model;
>
> gtk_init(&argc, &argv);
>
> window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> g_signal_connect(window, "delete_event", G_CALLBACK(gtk_main_quit), NULL);
>
> model = create_model();
> combo = create_combo(model);
>
> gtk_container_add(GTK_CONTAINER(window), combo);
>
> gtk_widget_show_all(window);
> gtk_main();
>
> return 0;
> }
> ---
>
> And the screenshots:
> - Gtk2: https://imgur.com/a/kcYx1Wt
> - Gtk3: https://imgur.com/a/VsuSz73
In case someone finds this thread in the future, I opened a bug report
(https://gitlab.gnome.org/GNOME/gtk/issues/1229), and the change that
resulted in the new Gtk3 behavior was quickly identified, but nothing else.
Ideally the Gtk2 behavior should be restored, but judging by previous
experience, I doubt that will happen. So I made a small wrapper that
restores the previous behavior (at least for my use case):
https://github.com/ekalin/kgtk3-combo-model
--
Indifference will certainly be the downfall of mankind, but who cares?
Eduardo M KALINOWSKI
edua...@kalinowski.com.br
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