Re: (no subject)

[Peter Krueger <pkrueger appss de>]

On Fri, 16 Apr 2004, Gustavo Cipriano Mota Sousa wrote:
> I am writting an app that uses a clist, and a frame, and, when the clist is
> selected, information about that row should be showed in the frame.
>
> I used the following code to connect the signal:
>
> frame = gtk_frame_new("Result");
> gtk_signal_connect(GTK_OBJECT(clist), "select_row",
>       GTK_SIGNAL_FUNC(callback_select_row), (gpointer) frame);
>
> and this one as a callback:
> void callback_select_row(GtkWidget *widget, gint row, gint column,
>                       GdkEventButton *event, gpointer data) {
>     GtkWidget *box, *label;
>     gint i;
>
>     /* code for reading data */
>     box = gtk_vbox_new(TRUE, 1);
>     for (i = 0; i < x; i++) {
>         sprintf(str, "%s: %s", field[i].name, row[i]);
>         label = gtk_label_new(str);
>         gtk_box_pack_start(GTK_BOX(box), label, TRUE, TRUE, 0);
>         gtk_widget_show(label);
>     }
>     gtk_container_add(GTK_CONTAINER(data), box);
>     gtk_widget_show(box);
>
> It works perfectly when i select a line from the list for the first time, but
> when i select another one, it keeps showing the data, related to the first
> selected row. I need someway to clear, the contents of the frame, or box,
> before adding new things. I am new at gtk and i have no clue how to achieve it.
Hello Gustavo!
You can use the function
  GtkWidget* gtk_bin_get_child(GtkBin *bin);
with your frame as argument to get the vbox from your last call. If
there is a child (the function returns something != NULL), remove it from
the frame with:
  void gtk_container_remove(GtkContainer *container, GtkWidget *widget);
This will delete the old widgets of the box and the labels in it.

Regards,
                       Peter
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