struct Gtk::ComboBox::FormatEntryTextSignal

• Gtk::ComboBox::FormatEntryTextSignal
• GObject::Signal
• Struct
• Value
• Object

Overview

Emitted to allow changing how the text in a combo box's entry is displayed.

See [property@Gtk.ComboBox:has-entry].

Connect a signal handler which returns an allocated string representing @path. That string will then be used to set the text in the combo box's entry. The default signal handler uses the text from the [property@Gtk.ComboBox:entry-text-column] model column.

Here's an example signal handler which fetches data from the model and displays it in the entry.

WARNING ⚠️ The following code is in c ⚠️

static char *
format_entry_text_callback (Gtk::ComboBox *combo,
                            const char *path,
                            gpointer     user_data)
{
  Gtk::TreeIter iter;
  Gtk::TreeModel model;
  double       value;

  model = gtk_combo_box_get_model (combo);

  gtk_tree_model_get_iter_from_string (model, &iter, path);
  gtk_tree_model_get (model, &iter,
                      THE_DOUBLE_VALUE_COLUMN, &value,
                      -1);

  return g_strdup_printf ("%g", value);
}

Defined in:

lib/gi-crystal/src/auto/gtk-4.0/combo_box.cr

Instance Method Summary

• #connect(*, after : Bool = false, &block : Proc(String, String)) : GObject::SignalConnection
• #connect(handler : Proc(String, String), *, after : Bool = false) : GObject::SignalConnection
• #connect(handler : Proc(Gtk::ComboBox, String, String), *, after : Bool = false) : GObject::SignalConnection
• #emit(path : String) : Nil
• #name : String

  The signal name

Instance Method Detail