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by kksou
Sample Code 63: How to allow user to change font using GtkFontSelectionDialog? |
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Written by kksou
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Tuesday, 17 October 2006 |
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Problem You want to allow user to change font with a GtkFontSelectionDialog as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 150);
$window->set_position(Gtk::WIN_POS_CENTER_ALWAYS);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
$accel_group = new GtkAccelGroup(); // create a new accelerator
$window->add_accel_group($accel_group); // attach it to the window
// display title
$menu_definition = array(
'_File' => array('E_xit|X'),
'_Font' => array('Change _Font|F')
);
setup_menu($vbox, $menu_definition); // note 2
$label = new GtkLabel('Press Ctrl-F to change font');
$vbox->pack_start($label);
$window->show_all();
Gtk::main();
// process menu item selection
function on_menu_select($menu_item) {
$item = $menu_item->child->get_label();
echo "menu selected: $item\n";
if ($item=='E_xit') Gtk::main_quit();
if ($item=='Change _Font') {
$selected_font = get_font(); // note 3
print "selected_font = $selected_font\n";
global $label;
$label->modify_font(new PangoFontDescription($selected_font));
}
}
// wrapper for class GetFont
function get_font() { // note 1
$getfont_dialog = new GetFont();
$font_name = $getfont_dialog->main();
return $font_name;
}
class GetFont{ // note 1
function GetFont() {
$dialog = new GtkFontSelectionDialog('Select Font');
$dialog->set_position(Gtk::WIN_POS_CENTER_ALWAYS);
$this->dialog = $dialog;
$dialog->show_all();
}
function main() {
$this->dialog->run();
$fontname = $this->dialog->get_font_name();
$this->dialog->destroy();
return $fontname;
}
}
function setup_menu($vbox, $menus) { // note 2
global $accel_group;
$menubar = new GtkMenuBar();
$vbox->pack_start($menubar, 0, 0);
foreach($menus as $toplevel => $sublevels) {
$menubar->append($top_menu = new GtkMenuItem($toplevel));
$menu = new GtkMenu();
$top_menu->set_submenu($menu);
foreach($sublevels as $submenu) {
if (strpos("$submenu", '|') === false) {
$accel_key = '';
} else {
list($submenu, $accel_key) = explode('|', $submenu);
}
if (is_array($submenu)) { // set up radio menus
$i=0;
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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.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
Explanation
- Display a font dialog is exactly the same as display a standard dialog. We write a wrapper
function get_font here so that we can get the font selection using a one-liner $selected_font = get_font().
- We make use of the codes in How to set up menu and radio menu - Part 3 - add accelerators? to display a menu with accelerators so that we can activate the font dialog with Ctrl-F.
- When Ctrl-F is pressed, we activate the font dialog, get user's selection, and change the font of the label.
Related Links
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