Sample Code 431: How to change radio button group on the fly? |
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Written by kksou
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Tuesday, 12 February 2008 |
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Problem I've showed you how to group radio buttons into different groups using GtkRadioButton::set_group() in the article How to setup grouped radio buttons using set group?
This article gives you a practical example of this: changing radio button group on-the-fly as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 300);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Change radio button group on the fly");
$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);
$vbox->pack_start($title, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);
setup_menu($vbox);
setup_numbers($vbox);
$window->show_all();
Gtk::main();
function setup_numbers($vbox) {
function setup_radio_numbers($radio_button_grp, $button_label) {
$radio = new GtkRadioButton($radio_button_grp, $button_label);
$radio->connect('toggled', "on_toggle_numbers");
return $radio;
}
function on_toggle_numbers($radio) {
global $status_area;
$label = $radio->child->get_label();
$active = $radio->get_active();
if ($active) print "radio button (number) pressed: $label\n";
}
$vbox->pack_start($hbox = new GtkHBox());
$hbox->pack_start($vbox1 = new GtkVBox());
$hbox->pack_start($vbox2 = new GtkVBox());
global $radios;
$vbox1->pack_start($hbox1 = new GtkHBox, 0);
$hbox1->pack_start($label = new GtkLabel('Odd'), 0);
$label->modify_font(new PangoFontDescription("Arial Bold"));
$radiogrp = null;
$radios[0] = setup_radio_numbers($radiogrp, 0);
for ($i=1; $i<=10; $i+=2) {
$radio = setup_radio_numbers($radiogrp, $i);
$vbox1->pack_start($radio, 0);
$radiogrp = $radio;
$radios[$i] = $radio;
}
$vbox2->pack_start($hbox2 = new GtkHBox, 0);
$hbox2->pack_start($label = new GtkLabel('Even'), 0);
$label->modify_font(new PangoFontDescription("Arial Bold"));
for ($i=2; $i<=10; $i+=2) {
$radio = setup_radio_numbers($radiogrp, $i); // note 1
$vbox2->pack_start($radio, 0);
$radiogrp = $radio;
$radios[$i] = $radio; // note 2
}
}
function setup_menu($vbox) {
function setup_radio($radio_button_grp, $button_label, $button_value) {
$radio = new GtkRadioButton($radio_button_grp, $button_label);
$radio->connect('toggled', "on_toggle", $button_value);
return $radio;
}
function on_toggle($radio, $value) {
global $status_area;
$label = $radio->child->get_label();
$active = $radio->get_active();
global $radios, $mode;
$mode = $value;
if ($mode=='one_only') {
for ($i=2; $i<=10; ++$i) {
$radios[$i]->set_group($radios[1]); // note 3
}
} elseif ($mode=='odd_and_even') {
for ($i=3; $i<=10; $i+=2) {
$radios[$i]->set_group($radios[1]); // note 4
}
$radios[2]->set_group($radios[0]);
for ($i=4; $i<=10; $i+=2) {
$radios[$i]->set_group($radios[2]); // note 4
}
$radios[2]->set_active(1);
}
}
function on_button() {
global $radios, $mode;
print "on_button. mode = $mode\n";
if ($mode=='one_only') {
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Explanation
- Create all the 10 radio buttons in the same group.
- Take note of the pointers to these radio buttons.
- Switch to all 10 numbers in same group.
- Switch to all odd numbers in one group, and all even numbers in another group.
- Find out which number is selected.
- Find out which odd and even numbers are selected.
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