Problem
You want to set up an editable pulldown menu (called GtkComboBoxEntry in PHP-GTK2) as shown below. Note that the main difference between a GtkComboBox and GtkComboBoxEntry is that GtkComboBoxEntry allow users to enter values that not present in the selection list. The user can choose and modify existing value, or enter a completely new one.
Solution
- An editable pulldown menu is created in php-gtk2 using GtkComboBoxEntry
- Although the name is longer, setting this up is surprisingly much simpler than setting up a GtkComboBox
- Unlike GtkComboBox, the selection of GtkComboBoxEntry is read more easily like a standard GtkEntry with get_text
Sample Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 31 32 33 36 37 38 39 40 41 42 43 44 45 46 47 48 | <?php $window = new GtkWindow(); $window->connect_simple('destroy', array( 'Gtk', 'main_quit')); $window->set_size_request(400,150); $window->add($vbox = new GtkVBox()); // display title $title = new GtkLabel("Setup and read value from ComboBoxEntry"); $title->modify_font(new PangoFontDescription("Times New Roman Italic 10")); $title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff")); $title->set_size_request(-1, 60); $vbox->pack_start($title, 0, 0); // the selection $list = array('item 1', 'item 2', 'item 3', 'item 4'); $vbox->pack_start($hbox=new GtkHBox(), 0, 0); $hbox->pack_start(new GtkLabel('Select: '), 0, 0); // Create a new comboboxentry and populates it $combobox = &GtkComboBoxEntry::new_text(); foreach($list as $choice) { $combobox->append_text($choice); } $combobox->get_child()->set_text(''); // note 1 $hbox->pack_start($combobox, 0, 0); // Set up the submit butotn $hbox->pack_start($button = new GtkLabel(' '), 0, 0); $hbox->pack_start($button = new GtkButton('Submit'), 0, 0); $button->set_size_request(60, 24); // Set up the event handler to respond to button click $button->connect('clicked', "on_button", $combobox); //note 2 // The callback function that is called when user clicks the submit button function on_button($button, $combobox) { $selection = $combobox->get_child()->get_text(); // note 3 print "You have selected: $selection\n"; } $window->show_all(); Gtk::main(); ?> |
Output
As shown above.Explanation
- This sets the default text of the comboboxentry. Here it's set to ''. You can of course set it to one of the selections, e.g. 'Item 1'.
- Note that we pass
$combobox
along so that we can have access to this when the user clicks the submit button. - Note that
$combobox
is a GtkEntry by nature. So we read its value using get_text
$combobox->get_child()->get_text();
Notes
You may want to take a look at How to setup and process GtkComboBox? to compare the difference between GtkComboBox and GtkComboBoxEntry.
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