Re: Combobox disable item

[cecashon aol com]

Hi Mike,

What part of the combo box are you trying to disable? If you want to filter rows or columns you can set up a 
tree model filter to do so. Maybe something like the following?

Eric


/*
    gcc -Wall combo_filter1.c -o combo_filter1 `pkg-config --cflags --libs gtk+-3.0`
    Tested on GTK3.18 and Ubuntu16.04
*/
#include<gtk/gtk.h>
#include<stdlib.h>

static gint combo_row=0;

static void change_combo(GtkComboBox *combo2, gpointer *data)
  {
    combo_row=gtk_combo_box_get_active(combo2);
    gtk_tree_model_filter_refilter(GTK_TREE_MODEL_FILTER(data[1]));
    gtk_combo_box_set_active(GTK_COMBO_BOX(data[0]), 0);
  }
static gboolean show_rgb(GtkTreeModel *model, GtkTreeIter *iter, gpointer data)
  {
    gchar *string=gtk_tree_model_get_string_from_iter(model, iter);
    gint row=atoi(string);
    g_free(string);
    
    if(combo_row==1&&row<3)
      {
        g_print("Combo1 Don't Show %i\n", row);
        return FALSE;
      }
    else
      { 
        g_print("Combo1 Show %i\n", row);
        return TRUE;
      }
  }
int main(int argc, char *argv[])
  {
    gtk_init(&argc, &argv);

    GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "Combo Filter");
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
    gtk_window_set_default_size(GTK_WINDOW(window), 300, 100);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    GtkTreeIter iter;
    GtkListStore *store=gtk_list_store_new(1, G_TYPE_STRING);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, 0, "Yellow", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, 0, "Purple", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, 0, "Cyan", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, 0, "Red", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, 0, "Green", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, 0, "Blue", -1);

    GtkTreeModel *model=gtk_tree_model_filter_new(GTK_TREE_MODEL(store), NULL);
    gtk_tree_model_filter_set_visible_func(GTK_TREE_MODEL_FILTER(model), 
(GtkTreeModelFilterVisibleFunc)show_rgb, NULL, NULL);  

    GtkCellRenderer *renderer=gtk_cell_renderer_text_new();

    GtkWidget *combo1=gtk_combo_box_new_with_model(model);
    gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combo1), renderer, TRUE);
    gtk_widget_set_hexpand(combo1, TRUE);
    gtk_widget_set_vexpand(combo1, TRUE);
    gtk_combo_box_set_active(GTK_COMBO_BOX(combo1), 0);
    gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(combo1), GTK_CELL_RENDERER(renderer), "text", 0, NULL);

    GtkWidget *combo2=gtk_combo_box_text_new();
    gtk_combo_box_text_insert(GTK_COMBO_BOX_TEXT(combo2), 0, "1", "Show All");
    gtk_combo_box_text_insert(GTK_COMBO_BOX_TEXT(combo2), 1, "2", "Show RGB");
    gtk_combo_box_set_active(GTK_COMBO_BOX(combo2), 0);
    gtk_widget_set_hexpand(combo2, TRUE);
    gtk_widget_set_vexpand(combo2, TRUE);
    gpointer data[]={combo1, model};
    g_signal_connect(combo2, "changed", G_CALLBACK(change_combo), data);

    g_object_unref(G_OBJECT(store));

    GtkWidget *grid=gtk_grid_new();
    gtk_grid_attach(GTK_GRID(grid), combo1, 0, 0, 1, 1);
    gtk_grid_attach(GTK_GRID(grid), combo2, 0, 1, 1, 1);
    gtk_container_add(GTK_CONTAINER(window), grid);
   
    gtk_widget_show_all(window);
    gtk_main();
    return 0;   
  }