087. How to insert and display text at end of GtkTextView?

Problem

You want to insert and display text at the end of the GtkTextView as shown below:

How to insert and display text at end of GtkTextView?


Solution


Sample Code

Note: Click the "Insert Text" toolbar button to insert text at the end of textview.

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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());

// define menu definition
$toolbar_definition = array('Insert Text');
setup_toolbar($vbox, $toolbar_definition);

// 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();

// setup toolbar
function setup_toolbar($vbox, $toolbar_definition) {
    $toolbar = new GtkToolBar();
    $vbox->pack_start($toolbar, 0, 0);
    foreach($toolbar_definition as $item) {
        if ($item=='<hr>') {
            $toolbar->insert(new GtkSeparatorToolItem(), -1);
        } else {
            $stock_image_name = 'Gtk::STOCK_'.strtoupper($item);
            if (defined($stock_image_name)) {
                $toolbar_item = GtkToolButton::new_from_stock(constant($stock_image_name));
            } else {
                $toolbar_item = new GtkToolButton(); // no stock item
                $toolbar_item->set_label("\n".$item); // just display the text label
            }
            $toolbar->insert($toolbar_item, -1);
            $toolbar_item->connect('clicked', 'on_toolbar_button', $item);
        }
    }
}

// process toolbar
function on_toolbar_button($button, $item) {
    global $view, $buffer;
    echo "toolbar clicked: $item\n";
    static $i=0;
    if ($item=='Insert Text') {
        ++$i;
        $iter = $buffer->get_end_iter(); // note 1
        $buffer->insert($iter, "This is line $i\n" ); // note 2
        $view->scroll_to_mark($buffer->get_insert(), 0); // note 3
    }
}

?>

Output

As shown above.
 

Explanation

We make use of the code in How to set up toolbar? to display the toolbar.

What's new here:

  1. Go to end of buffer.
  2. Insert text.
  3. Scroll to end of text.

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