Re: Displaying 4 numbers on 2 different rows, in a single tree cell

["David Necas (Yeti)" <yeti physics muni cz>]

On Thu, Jul 14, 2005 at 12:31:11PM -0500, Nickolai Dobrynin wrote:
> Is there any way I can display four numbers in a single TreeView cell so that
> each individual number would occupy the upper left, upper right, lower left and
> lower right corner, respectively:
>  ___________
> |  1           2  |
> |                   |
> |  3           4  |
> ------------------

(hint: use a fixed-witdh font when drawing ASCII-art.)

> It's kind of like a table inside another table.  I would also like to
> control the justification (left/right/center).
>
> Perhaps there is a way to display a TreeView inside another TreeView? 
> Since my "inner" table is fairly simple, perhaps I could get away with
> something less complicated than that?

You can pack two cell renderes into one column and put
two-line texts to them.  This is a dirty trick and aligning
will work as expected only if the texts are of equal width,
otherwise you have to take up with left alignment.  See
attached example.  The ultimate solution is to write your own
cell renderer.

Yeti


--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?


============================================================================
#include <gtk/gtk.h>

enum {
    COLUMN_1,
    COLUMN_2,
    COLUMN_3,
    N_COLUMNS
};

static void
fill_model(GtkListStore *store)
{
    GtkTreeIter iter;
    gint i;
    gchar s[4] = ".\n.";

    for (i = 0; i < 6; i++) {
        gtk_list_store_append(store, &iter);
        s[0] = g_random_int_range('0', '9'+1);
        s[2] = g_random_int_range('0', '9'+1);
        gtk_list_store_set(store, &iter, COLUMN_1, s, -1);
        s[0] = g_random_int_range('0', '9'+1);
        s[2] = g_random_int_range('0', '9'+1);
        gtk_list_store_set(store, &iter, COLUMN_2, s, -1);
        s[0] = g_random_int_range('0', '9'+1);
        s[2] = g_random_int_range('0', '9'+1);
        gtk_list_store_set(store, &iter, COLUMN_3, s, -1);
    }
}

static void
cell_data_func(G_GNUC_UNUSED GtkTreeViewColumn *tree_column,
               GtkCellRenderer *renderer,
               GtkTreeModel *tree_model,
               GtkTreeIter *iter,
               gpointer data)
{
    guint col = GPOINTER_TO_UINT(data);
    gchar *s;

    gtk_tree_model_get(tree_model, iter, col, &s, -1);
    g_object_set(G_OBJECT(renderer), "text", s, NULL);
    g_free(s);
}

int
main(int argc,
     char *argv[])
{
    GtkWidget *window, *view;
    GtkTreeViewColumn *column;
    GtkCellRenderer *renderer;
    GtkListStore *store;

    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    store = gtk_list_store_new(N_COLUMNS,
                               G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING);
    fill_model(store);
    view = gtk_tree_view_new();
    gtk_container_add(GTK_CONTAINER(window), view);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(store));
    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);

    column = gtk_tree_view_column_new();
    renderer = gtk_cell_renderer_text_new();
    g_object_set(G_OBJECT(renderer), "xalign", 0.0, NULL);
    gtk_tree_view_column_pack_start(column, renderer, TRUE);
    gtk_tree_view_column_set_cell_data_func(column, renderer,
                                            &cell_data_func,
                                            GUINT_TO_POINTER(COLUMN_1),
                                            NULL);
    renderer = gtk_cell_renderer_text_new();
    g_object_set(G_OBJECT(renderer), "xalign", 0.5, NULL);
    gtk_tree_view_column_pack_start(column, renderer, TRUE);
    gtk_tree_view_column_set_cell_data_func(column, renderer,
                                            &cell_data_func,
                                            GUINT_TO_POINTER(COLUMN_2),
                                            NULL);
    renderer = gtk_cell_renderer_text_new();
    g_object_set(G_OBJECT(renderer), "xalign", 1.0, NULL);
    gtk_tree_view_column_pack_start(column, renderer, TRUE);
    gtk_tree_view_column_set_cell_data_func(column, renderer,
                                            &cell_data_func,
                                            GUINT_TO_POINTER(COLUMN_3),
                                            NULL);

    gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);

    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}