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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 Part 4, we change the cursor when the user hovers the mouse over the link in the textview.
- In Part 5, we display a tooltip when the user hovers the mouse over the link in the textview.
In this article, we will display a context-senstivie popup menu when there is a right-mouse click on the link in the textview as shown below:
Solution
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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 6\n".
"Display Context-Sensitive Menu");
$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);
$view->add_events(Gdk::BUTTON_PRESS_MASK);
$view->connect('button-press-event', 'on_button_press_in_textview'); // note 1
$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);
$link_cursor = new GdkCursor(Gdk::DRAFT_LARGE);
$tooltips = new TreeviewTooltips();
Gtk::main();
// Setup highlight tag
class LinkTag extends GtkTextTag {
function __construct($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])) {
launch_browser($url[$i]);
} else {
}
}
return true;
}
function on_button_press_in_textview($view, $event) {
$buffer_location = $view->window_to_buffer_coords
(Gtk::TEXT_WINDOW_TEXT, $event->x, $event->y);
$iter = $view->get_iter_at_location(
$buffer_location[0], $buffer_location[1]);
if ($event->button==3) { // note 2
global $tag, $url, $tag_count;
global $tooltips;
for ($i=0; $i<$tag_count; ++$i) {
if ($iter->has_tag($tag[$i])) {
$tooltips->on_leave($event); // note 3
popup_menu($event, $url[$i]); // note 4
return true;
}# else {
}
} else {
return false;
}
}
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);
$status->push($context_id, $url[$i]);
$view->get_window(Gtk::TEXT_WINDOW_TEXT)->set_cursor($link_cursor);
global $tooltips;
$tooltips->on_motion($event, $url[$i]);
break;
} else {
$status->pop($context_id);
$view->get_window(Gtk::TEXT_WINDOW_TEXT)->set_cursor($standard_cursor);
global $tooltips;
$tooltips->on_leave($event);
}
}
}
//function to prompt for user data
function prompt($str) {
$prompt = new Prompt($str);
$input = $prompt->entry->get_text();
return $input;
}
class Prompt{
var $entry; // the user input
function Prompt($str) {
$dialog = new GtkDialog('Prompt', null, Gtk::DIALOG_MODAL);
$top_area = $dialog->vbox;
$top_area->pack_start($hbox = new GtkHBox());
$stock = GtkImage::new_from_stock(Gtk::STOCK_DIALOG_QUESTION,
Gtk::ICON_SIZE_DIALOG);
$hbox->pack_start($stock, 0, 0);
$hbox->pack_start(new GtkLabel($str));
$this->entry = new GtkEntry();
$hbox->pack_start($this->entry, 0, 0);
$hbox->pack_start(new GtkLabel(' '), 0, 0);
$dialog->add_button(Gtk::STOCK_OK, Gtk::RESPONSE_OK);
$buttons = $dialog->action_area->get_children();
$button_ok = $buttons[0]; // get the ID of the OK button
// simulate button click when user press enter
$this->entry->connect('activate', array(&$this, 'on_enter'), $button_ok);
$dialog->set_has_separator(false);
$dialog->show_all();
$dialog->run();
$dialog->destroy();
}
// simulate button click when user press enter
function on_enter($entry, $button) {
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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 Part 5.
We also make use of the code in How to display context sensitive popup menu with right mouse click in GtkTreeView? to display the popup menu.
What's new here:
- Set up the signal handler for right-mouse click.
- Make sure it's the right-mouse click.
- Hide the tooltip if there's any.
- Display the popup menu.
- The menu definitions.
- Process the menu selected. In this example, we only process "Launch in Broswer".
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.
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