Sample Code 151: How to add numbering in front of selected text in GtkTextView? |
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Written by kksou
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Thursday, 25 January 2007 |
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Problem You want to add auto numbering in front of highlighted text in a GtkTextView as shown below:
Solution
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$window = new GtkWindow();
$window->set_size_request(400, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Add numbering in front of highlighted text\n");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 20);
$title->set_justify(Gtk::JUSTIFY_CENTER);
$alignment = new GtkAlignment(0.5, 0.5, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment);
$hbox = new GtkHBox();
$hbox->pack_start($button = new GtkButton('Add numbering'), 0);
$vbox->pack_start($hbox, 0);
$button->connect('clicked', 'on_button'); // note 1
// Create a new buffer and a new view to show the buffer.
$buffer = new GtkTextBuffer();
$view = new GtkTextView();
$view->set_buffer($buffer);
$view->modify_font(new PangoFontDescription("Arial 10"));
$view->set_wrap_mode(Gtk::WRAP_WORD);
$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
$vbox->pack_start($scrolled_win);
$scrolled_win->add($view);
$window->show_all();
Gtk::main();
function on_button($button) {
global $view, $buffer;
list($start_iter, $end_iter) = $buffer->get_selection_bounds(); // note 2
if ($start_iter==null || $end_iter==null) {
$cursor_pos = $buffer->get_mark('insert'); // note 3
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Explanation
- Set up the "Add numbering" button.
- Get the start and end iter of the selection bounds.
- If user didn't select any text, use the current cursor position as start and end iter.
- Get the line number of the start and end iter.
- Move the iter to the start of the line.
- Move the iter to the first non-space character.
- Add the number.
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February 25, 2008 5:40pm