Problem
You have set up a search field that allows user to search for text in a GtkTextView in Part 1.
You have also added the "Find Next" button in Part 2.
However, there is a problem with Part 1 and Part 2. If the text found is not visible, it does not scroll to the text. We will fix this in this example as shown below:
Solution
- Mark the last search position using GtkTextbuffer::create_mark().
- Scroll to this position using GtkTextview::scroll_mark_onscreen().
Sample Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 39 40 41 42 43 44 46 47 48 49 50 51 53 54 55 56 57 58 59 61 62 63 64 65 66 67 68 69 70 71 72 73 75 76 78 79 80 82 83 84 85 | <?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 3\n". "Scroll to the found text"); $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); $hbox->pack_start($button_search_next = new GtkButton('Next'), 0); $vbox->pack_start($hbox, 0); $button_search->connect('clicked', 'on_search_button', $entry); $button_search_next->connect('clicked', 'on_search_next_button', $entry); // 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 = $buffer->get_start_iter(); search($search_str, $start_iter); } function on_search_next_button($button, $entry) { global $view, $buffer; $search_str = $entry->get_text(); $last_search_pos = $buffer->get_mark('last_search_pos'); if ($last_search_pos==null) return; $last_search_iter = $buffer->get_iter_at_mark($last_search_pos); search($search_str, $last_search_iter); } function search($search_str, $start_iter) { global $view, $buffer; $match_start = $buffer->get_start_iter(); $match_end = $buffer->get_end_iter(); $found = $start_iter->forward_search($search_str, 0, $match_start, $match_end, null); if ($found) { $buffer->select_range($match_start, $match_end); $last_search_pos = $buffer->create_mark('last_search_pos', $match_end, false); // note 1 $view->scroll_mark_onscreen($last_search_pos); // note 2 } } ?> |
Output
As shown above.Explanation
We make use of the code in Part 2.
What's new here:
- Mark the last search position.
- Scroll to the last search position.
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