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Problem You want to highlight enclosing html tags in a GtkTextView as shown below:
Solution
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| <?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("Highlight matching HTML tags");
$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);
$left_start_iter = $left_end_iter = null;
$right_start_iter = $right_end_iter = null;
// Create a new buffer and a new view to show the buffer.
$buffer = new GtkTextBuffer();
$buffer->set_text('<p>This is a test</p>
<ul>
<li>item 1</li>
<li>item 2</li>
<li>item 3</li>
</ul>');
$view = new GtkTextView();
$view->set_buffer($buffer);
$view->modify_font(new PangoFontDescription("Arial 10"));
$view->set_wrap_mode(Gtk::WRAP_WORD);
$view->connect('button-press-event', 'on_button_press_in_textview');
$view->connect('key-press-event', 'on_key_press_in_textview');
$hbox = new GtkHBox();
$hbox->pack_start($button = new GtkButton('Find enclosing tags'), 0);
$vbox->pack_start($hbox, 0);
$button->connect('clicked', 'on_button', $buffer);
$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
$vbox->pack_start($scrolled_win);
$scrolled_win->add($view);
$tag_table = $buffer->get_tag_table();
$tag['highlight'] = new GtkTextTag();
$tag['highlight']->set_property('background', "#ffff00");
$tag_table->add($tag['highlight']);
$window->show_all();
Gtk::main();
function find_left_tag($iter, $buffer) {
global $tag;
$match_start = $iter->copy();
$match_end = $iter->copy();
// check left { first
$found = $iter->backward_search('<', 0, $match_start, // note 1
$match_end, null);
if (!$found) return null;
// check if there's a } on the left
$iter2 = $match_end->copy();
$match_start2 = $iter2->copy();
$match_end2 = $iter2->copy();
$found2 = $iter2->forward_search('>', 0, $match_start2, // note 2
$match_end2, null);
if ($found2 && $match_start->compare($match_start2)!=-1) return null;
$buffer->apply_tag($tag['highlight'], $match_start, $match_end2); // note 3
return array($match_start, $match_end2);
}
function find_right_tag($current_iter, $buffer) {
global $tag;
$iter = $current_iter->copy();
$match_start = $iter->copy();
$match_end = $iter->copy();
// check right } first
$found = $iter->forward_search('<', 0, $match_start, // note 4
$match_end, null);
if (!$found) return null;
// check if there's a { on the left
$iter2 = $match_end->copy();
$match_start2 = $iter2->copy();
$match_end2 = $iter2->copy();
$found2 = $iter2->forward_search('>', 0, $match_start2, // note 5
$match_end2, null);
if ($found2 && $match_start->compare($match_start2)!=-1) return null;
$buffer->apply_tag($tag['highlight'], $match_start, $match_end2); // note 6
return array($match_start, $match_end2);
}
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Explanation
- Search for start of left tag.
- Search for end of left tag.
- Highlight the left tag.
- Search for start of right tag.
- Search for end of right tag.
- Highlight the right tag.
Note
To make the code easier to understand, I did not put in any error checking here. In your actual implementation, you should check that the start and end tags are matching, otherwise the following might occur:
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