Sample Code 43: How to set a button as default action when user press Enter? |
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Written by kksou
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Monday, 02 October 2006 |
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Problem You would like to set a button as default action when user press Enter as shown below:
Solution
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$window = new GtkWindow();
$window->set_size_request(400, 150);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Default Button Action");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0, 0);
$hbox = new GtkHBox();
$vbox->pack_start($hbox, 0, 0);
$hbox->pack_start(new GtkLabel("Keyword: "), 0, 0);
$hbox->pack_start($entry = new GtkEntry(), 0, 0);
$hbox->pack_start($button = new GtkButton("Search"), 0, 0);
$entry->connect('activate', 'on_enter', $button); // note 1
$button->connect('clicked', 'on_click', $entry); // note 2
function on_enter($entry, $button) { // handle Enter key
$keyword = $entry->get_text(); // get user input
echo "Enter pressed. keyword = $keyword\n";
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Explanation
- Set up event handler to listen to Enter key. Note that we pass the ID of the button along. We need the button ID later to simulate button click.
- Set up event handler to listen to button click. Note that we pass the ID of the GtkEntry along. We need the GtkEntry ID later to get user input.
- We simulate a button click with GtkButton::clicked().
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