Sample Code 17: How to display and process grouped radio buttons? |
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Written by kksou
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Saturday, 16 September 2006 |
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Problem You want to display grouped radio buttons as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 200);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel();
$title->set_markup('<span color="blue" font_desc="Times New Roman Italic 12">
Button Group Demo</span>');
$vbox->pack_start($title);
// setup grouped radio buttons
$radio1 = setup_radio(null, 'radio button 1', '101'); // note 1
$radio2 = setup_radio($radio1, 'radio button 2', '102'); // note 2
$radio3 = setup_radio($radio1, 'radio button 3', '103');
// pack them inside vbox
$vbox->pack_start($radio1, 0, 0);
$vbox->pack_start($radio2, 0, 0);
$vbox->pack_start($radio3, 0, 0);
// add a status area
$vbox->pack_start($status_area = new GtkLabel('Click a Button'));
// function to simplify the display of grouped radio buttons
function setup_radio($radio_button_grp, $button_label, $button_value) { // note 3
$radio = new GtkRadioButton($radio_button_grp, $button_label);
$radio->connect('toggled', "on_toggle", $button_value); // note 4
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Explanation
- For
new GtkRadioButton, use null for the first radio button of the group.
- For subsequent buttons, put the pointer to the first radio button (in this case
$radio1) as the first argument to new GtkRadioButton. PHP-GTK2 will then group all these into the same group.
- Wrote this small function to save some typing and make the codes cleaner.
- Set up the callback function when the radio button is toggled. Note that we also pass along the button value.
- This is the callback function that is being called when a radio button is being toggled.
- Get the label of the radio button.
- Check if the radio button is toggled.
- If yes, display the label and value in the status area. Note that we have the corresponding value of the radio button (
$value) because we have set it up in [4].
Notes
This example simulates what we have always been doing in HTML:
Each radio button could have a label and a corresponding value.
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User reviews Average user ratings:  5.0 (from 2 users) Note: You have to be a registered member to leave a comment. Free registration here. |
April 03, 2008 12:28pm
July 06, 2008 6:46pm
Very useful !