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Sample Code 152: How to highlight matching brackets in GtkTextView - Part 1? |
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Written by kksou
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Friday, 26 January 2007 |
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Problem You want to highlight enclosing curly brackets 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 curly bracket - 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, 20);
$title->set_justify(Gtk::JUSTIFY_CENTER);
$alignment = new GtkAlignment(0.5, 0.5, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment);
// Setup TextView
$buffer = new GtkTextBuffer();
$buffer->set_text('if ($i==1) {
test();
} else {
test2();
}');
$view = new GtkTextView();
$view->set_buffer($buffer);
$view->modify_font(new PangoFontDescription("Arial 10"));
$view->set_wrap_mode(Gtk::WRAP_WORD);
$hbox = new GtkHBox();
$hbox->pack_start($button = new GtkButton('Find enclosing bracket'), 0);
$vbox->pack_start($hbox, 0);
$button->connect('clicked', 'on_button', $buffer); // note 1
$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
$vbox->pack_start($scrolled_win);
$scrolled_win->add($view);
// Setup highlight tag
$tag_table = $buffer->get_tag_table();
$tag['highlight'] = new GtkTextTag(); // note 2
$tag['highlight']->set_property('background', "#ffff00"); // note 2
$tag_table->add($tag['highlight']);
$window->show_all();
Gtk::main();
function find_left_bracket($iter, $buffer) {
global $tag;
$iter2 = $iter->copy();
$match_start = $iter->copy();
$match_end = $iter->copy();
// check left { first
$found = $iter->backward_search('{', 0, $match_start,
$match_end, null);
if (!$found) return null;
$buffer->apply_tag($tag['highlight'], $match_start, $match_end); // note 6
return array($match_start, $match_end);
}
function find_right_bracket($iter, $buffer) {
global $tag;
$iter2 = $iter->copy();
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
Explanation
- Set up the "Highlight Bracket" button.
- Set up highlight tag. Please refer to How to apply styles to GtkTextView using GtkTextTag - Part 1? for details.
- Get current cursor position.
- Find left bracket.
- Find right bracket.
- Highlight the left bracket.
- Highlight the right bracket.
Note
There are a couple of things we need to improve:
- Pressing the button when the cursor is at "else" should not highlight anything.
- When the user moves the cursor (by mouse or keyboard), the highlight should disappear.
We will fix these in the next two articles.
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