How to set the value of Gtk.ComboBox?

Question

All I can figure out is something in common with ComboBox.GetEnumerator or something like that.

I would like to do something like:

System.Collections.IEnumerator e = this.task_difficulty_combobox.GetEnumerator();
while (e.MoveNext())
{
    if (e.ToString() == this.task.Difficulty.ToString())
    {
        Gtk.TreeIter i = (Gtk.TreeIter)e.Current;
        this.task_difficulty_combobox.SetActiveIter(i);
        break;
    }
}

However, this does not work.

Answer 1

The reason your code doesn't work is because the "elements in combobox" are actually cell handlers packed into it to display data columns. To get the actual data, you need a TreeModel object.

If you really have to choose based solely on what's in the combo, here's how you can do it:

string[] values = new string[]{"one", "two", "three"};
var combo = new ComboBox(values);

Gtk.TreeIter iter;
combo.Model.GetIterFirst (out iter);
do {
  GLib.Value thisRow = new GLib.Value ();
  combo.Model.GetValue (iter, 0, ref thisRow);
  if ((thisRow.Val as string).Equals("two")) {
    combo.SetActiveIter (iter);
    break;
  }
} while (combo.Model.IterNext (ref iter));

However, it is usually more concise so that your values ​​are indexed as follows:

List<string> values = new List<string>(){"one", "two", "three"};  
var combo = new ComboBox(values.ToArray());

// Select "two"
int row = values.IndexOf("two");
Gtk.TreeIter iter;
combo.Model.IterNthChild (out iter, row);
combo.SetActiveIter (iter);

Answer 2

" " , ComboBox, Array List

for (int i = 0; i < combo.Model.IterNChildren(); ++i) //iterate over ComboBox elements
{
  if (myList[i].Equals(elementToSelect))
  {
    combo.Active = i;
    break;
  }
}

Answer 3

, # , C -. , Google.

, GTK ComboBox GTK Tree Model, , iter . , Python #, , , C GTK, :

, gtk, - , - c:

int set_combo_box_text(GtkComboBox * box, char * txt) 
{
   GtkTreeIter iter;
   GtkListStore * list_store;
   int valid;
   int i;
   list_store = gtk_combo_box_get_model(box);

   // Go through model list and find the text that matches, then set it active
   i = 0; 
   valid = gtk_tree_model_get_iter_first (GTK_TREE_MODEL(list_store), &iter);
   while (valid) {
      gchar *item_text;
      gtk_tree_model_get (GTK_TREE_MODEL(list_store), &iter, 0, &item_text, -1); 
      printf("item_text: %s\n", item_text);
      if (strcmp(item_text, txt) == 0) { 
         gtk_combo_box_set_active(GTK_COMBO_BOX(box), i);
         return true;
         //break;
      }    
      i++; 
      valid = gtk_tree_model_iter_next (GTK_TREE_MODEL(list_store), &iter);
   }
   printf("failed to find the text in the entry list for the combo box\n");
}

combobox, iter, - :

valid = gtk_tree_model_get(GTK_TREE_MODEL(list_store), &iter, 0, &item_0, 1, &item_1, 2, &item_2, ... , -1); 

Hope this helps.