165. How to tab out of GtkTextView - Part 2?

Problem

In Part 1, we press Tab to move focus out of the textview.

Suppose you still want to be able to insert a tab key if necessary. If you're used to Microsoft Word, the convention used is to press Ctrl-tab to enter a tab. We'll adopt the same convention here, i.e. press Tab to move out of textview, and Ctrl-Tab to insert a tab as shown below:

How to tab out of GtkTextView - Part 2?


Solution


Sample Code

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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("Press tab to move out of TextView\n".
"Part 2 - Insert Tab");
$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);
$search_box = new GtkEntry();
$hbox->pack_start($search_box, 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', $search_box);
$button_search_next->connect('clicked', 'on_search_next_button', $search_box);

// 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);
$view->connect('key-press-event', 'on_keypress', $search_box);

$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);
        $view->scroll_mark_onscreen($last_search_pos);
    }
}

function on_keypress($view, $event, $search_box) {
    if ($event->keyval==Gdk::KEY_Tab) {
        if ($event->state & Gdk::CONTROL_MASK) { // note 1
            global $buffer;
            $buffer->insert_at_cursor("\t"); // note 2
            return true;
        } else {
            $search_box->grab_focus(); // note 3
            return true;
        }
    } else {
        return false;
    }
}

?>

Output

As shown above.
 

Explanation

We make use of the code in .

What's new here:

  1. Is it a ctrl-tab?
  2. Yes, insert a tab at the current cursor position.
  3. No, it's just a tab. Move the focus to the search box.

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