Sample Code 473: How to apply styles to GtkTextView using GtkTextTag - Part 2 - toggle the formatting on and off? |
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Written by kksou
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Thursday, 10 April 2008 |
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Problem I've showed you how to apply styles to GtkTextView / GtkTextBuffer (e.g. bold, italic, underline, font color and highlight) in How to apply styles to GtkTextView using GtkTextTag - Part 1?
This article shows you how to toggle these styles on and off using the same format buttons as shown below.
Note: This sample code in this article is contributed by Dysmas. It's a follow-up of another sample code contributed by him: How to have a popup textview for editing of long text?
Solution
- First we need to test if there's any existing style within user's highlighted text with the following methods:
- If there is no style applied, we add the style with GtkTextbuffer::apply_tag().
- If the style is already there, we remove it with GtkTextbuffer::remove_tag().
Sample Code 1
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| <?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// define menu definition
$toolbar_definition = array('Bold', 'Italic', 'Underline', '<hr>',
'Blue', '<hr>', 'Highlight');
setup_toolbar($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);
$vbox->pack_start($view);
$view->grab_focus();
$tag_table = $buffer->get_tag_table();
$tag['Bold'] = new GtkTextTag();
$tag['Bold']->set_property('weight', Pango::WEIGHT_BOLD);
$tag_table->add($tag['Bold']);
$tag['Italic'] = new GtkTextTag();
$tag['Italic']->set_property('style', Pango::STYLE_ITALIC);
$tag_table->add($tag['Italic']);
$tag['Underline'] = new GtkTextTag();
$tag['Underline']->set_property('underline', Pango::UNDERLINE_SINGLE);
$tag_table->add($tag['Underline']);
$tag['Blue'] = new GtkTextTag();
$tag['Blue']->set_property('foreground', "#0000ff");
$tag_table->add($tag['Blue']);
$tag['Highlight'] = new GtkTextTag();
$tag['Highlight']->set_property('background', "#ffff00");
$tag_table->add($tag['Highlight']);
$window->show_all();
Gtk::main();
// setup toolbar
function setup_toolbar($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 {
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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.
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- Have some doubt about the registration? Please read this forum article.
Explanation We make use of the code in How to set up toolbar? to display the toolbar.
What's new here:
- Selection already contains the style?
- Yes, remove it.
- No, apply the style.
Note
The sample code above only performs bold. When you press the bold button on a "bolded" text, it doesn't unbold. We will improve on this in Part 2.
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