Problem
By default, GtkTreeView sets the tab at every eighth character as shown below:
You would like to change the tab position of a GtkTextView. In this Part 1, we will show how to set the tab position using pixel value (e.g. every 100 pixels) as shown below:
Solution
- Create a new PangoTabArray on the GtkTreeView.
- Set each tab position with PangoTabArray::set_tab()
- Then impose the tabs on the textview with GtkTextView::set_tabs() on the GtkTreeView.
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 30 31 32 33 34 35 41 42 43 44 45 46 47 48 49 50 | <?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("Set the Tab Position of GtkTextView\n". "Part 1 - by pixel unit"); $title->modify_font(new PangoFontDescription("Times New Roman Italic 10")); $title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff")); $title->set_size_request(-1, 40); $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); // 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("Courier New")); $view->set_wrap_mode(Gtk::WRAP_WORD); $tabs = new PangoTabArray(0, true); // note 1 $tabs->set_tab(0, PANGO::TAB_LEFT, 100); // note 2 $tabs->set_tab(1, PANGO::TAB_LEFT, 200); // note 2 $tabs->set_tab(2, PANGO::TAB_LEFT, 300); // note 2 $view->set_tabs($tabs); // note 3 $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(); ?> |
Output
As shown above.
Explanation
- Create a new PangoTabArray. Note that for the second parameter, set the value to
true
to use pixel unit. Otherwise it will use pango unit. - Set the tab positions. In this example, we set a tab for every 100 pixels.
- Set the tab on the treeview.
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