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Problem You want to allow users to insert links in a GtkTextView. The user will highlight some text and press the "Insert Link" button. A popup dialog box will appear where the user enters the URL address. On pressing return, the URL address will be registered, and the link highlighted in the standard blue underlined text.
- In Part 1, we have the link displayed as blue underlined text.
- In Part 2, we launch the link in the default browser when the user clicks on the link.
- In Part 3, we display the url address in the status bar when the user hovers the mouse over the link.
In this article, we will change the cursor when the user hovers the mouse over the link in the textview as shown below:
Solution
Sample Code 1
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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("Insert Links in GtkTextView - Part 4\n".
"Change Cursor when over Link");
$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, 0.5, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment);
// Setup TextBuffer and TextView
$tag_count = 0;
$buffer = new GtkTextBuffer();
$buffer->set_text('PHP-GTK2 resources:
1) manual: http://gtk.php.net/manual/en/gtkclasses.php
2) mailing list: http://www.nabble.com/Php---GTK---General-f171.html
');
$view = new GtkTextView();
$view->set_buffer($buffer);
$view->modify_font(new PangoFontDescription("Arial 10"));
$view->set_wrap_mode(Gtk::WRAP_WORD);
$buffer->connect('mark-set', 'on_mark_set');
$view->connect('motion-notify-event', 'on_motion_in_textview');
$view->set_events(Gdk::POINTER_MOTION_MASK);
$hbox = new GtkHBox();
$hbox->pack_start($button = new GtkButton('Insert Link'), 0);
$vbox->pack_start($hbox, 0);
$button->connect('clicked', 'on_button', $buffer);
$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
$scrolled_win->add($view);
$vbox->pack_start($scrolled_win);
// setup status area
$status = new GtkStatusbar(); // note 1
$vbox->pack_start($status, 0);
$window->show_all();
$standard_cursor = new GdkCursor(Gdk::XTERM); // note 1
$link_cursor = new GdkCursor(Gdk::DRAFT_LARGE); // note 2
Gtk::main();
// Setup highlight tag
class LinkTag extends GtkTextTag {
function __construct($link) {
global $buffer;
parent::__construct();
$tag_table = $buffer->get_tag_table();
$this->set_property('foreground', "#0000ff");
$this->set_property('underline', Pango::UNDERLINE_SINGLE);
$tag_table->add($this);
}
}
function on_button($button, $buffer) {
global $view, $tag, $url, $tag_count;
$cursor_pos = $buffer->get_mark('insert');
$iter = $buffer->get_iter_at_mark($cursor_pos);
list($start, $end) = $buffer->get_selection_bounds();
if ($start==null || $end==null) return; // no selection
$url[$tag_count] = prompt("Enter URL:");
$tag[$tag_count] = new LinkTag($url[$tag_count]);
$buffer->apply_tag($tag[$tag_count], $start, $end);
++$tag_count;
$buffer->place_cursor($end);
$view->grab_focus();
}
function on_mark_set($buffer, $textiter, $textmark) {
global $tag, $url, $tag_count;
if ($textmark->get_name()!='insert') return;
$cursor_pos = $buffer->get_insert();
$iter = $buffer->get_iter_at_mark($cursor_pos);
for ($i=0; $i<$tag_count; ++$i) {
if ($iter->has_tag($tag[$i])) {
if (PHP_SHLIB_SUFFIX=='dll') {
$shell = new COM('WScript.Shell');
$shell->Run('cmd /c start "" "' . $url[$i] . '"', 0, FALSE);
unset($shell);
} else {
exec("firefox $url[$i] > /dev/null &");
}
} else {
}
}
return true;
}
function on_motion_in_textview($view, $event) {
global $standard_cursor, $link_cursor;
$buffer_location = $view->window_to_buffer_coords
(Gtk::TEXT_WINDOW_TEXT, $event->x, $event->y);
$iter = $view->get_iter_at_location(
$buffer_location[0], $buffer_location[1]);
if ($iter==null) return;
global $tag, $url, $tag_count, $status;
for ($i=0; $i<$tag_count; ++$i) {
$context_id = $status->get_context_id('msg1');
if ($iter->has_tag($tag[$i])) {
$status->pop($context_id);
|
- 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 We make use of the code in Part 3.
We also make use of the code in How to change cursor over clickable GtkLabel - Part 1 - using pre defined cursors? to change the cursor.
What's new here:
- This is the original I-beam cursor used by GtkTextView.
- This is the cursor to be used when over the link.
- If the mouse is over a link, change the cursor.
- If the mouse is not over any link, switch it back to the original I-beam cursor.
Note
This example works only on windows. It does not work on Linux. This is because for some reason, GtkTextView does not emit the signal motion-notify-event in linux. So there's no way you can know if the current mouse location is over a link.
Related Links
User reviews Average user ratings:  0.0 (from 1 user) Note: You have to be a registered member to leave a comment. Free registration here. |
March 09, 2007 11:25am
Thanks for a nice article
I just found out from the nice guys in the pygtk irc, that I could make the cursor thing work on Linux by adding the line "textview.window.get_pointer()" in the motion_event handler.