Problem
You want to provide a search field that allow user to search for text in a GtkTextView as shown below:
Solution
- We search text in a GtkBuffer using GtkTextiter::forward_search().
- If the text is found, we highlight the text with GtkTextbuffer::select_range().
Sample Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 36 37 38 39 40 41 43 44 45 46 47 48 50 51 52 53 55 56 57 58 59 60 | <?php $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("Search for text in GtkTextView - Part 1\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, 60); $title->set_justify(Gtk::JUSTIFY_CENTER); $alignment = new GtkAlignment(0.5, 0, 0, 0); $alignment->add($title); $vbox->pack_start($alignment, 0, 0); $vbox->pack_start(new GtkLabel(), 0, 0); $hbox = new GtkHBox(); $hbox->pack_start(new GtkLabel("Search string: "), 0); $hbox->pack_start($entry = new GtkEntry(), 0); $hbox->pack_start($button_search = new GtkButton('Search'), 0); $vbox->pack_start($hbox, 0); $button_search->connect('clicked', 'on_search_button', $entry); // 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 12")); $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); $window->show_all(); Gtk::main(); function on_search_button($button, $entry) { global $view, $buffer; $search_str = $entry->get_text(); $start_iter = $buffer->get_start_iter(); // note 2 $match_start = $buffer->get_start_iter(); // note 3 $match_end = $buffer->get_end_iter(); // note 4 $found = $start_iter->forward_search($search_str, 0, $match_start, $match_end, null); // note 5 if ($found) { $buffer->select_range($match_start, $match_end); // note 6 } } ?> |
Output
As shown above.Explanation
- Set up the search button.
- Get the start iter.
- The iter that will store the start of match.
- The iter that will store the end of match.
- Search for the text.
- Highlight the text if the text is found.
Note
In the next article, we will add the "Find Next" button.
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