3.4 Passing additional data to callback function - Part 1 |
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Written by kksou
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Monday, 12 May 2008 |
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Objective
In HTML, we can use
<input type="radio" name="radiogrp1" value="NY">New York
to attach a value to each radio item. When the user select, say New York, the value returned will be NY.
We will achieve the same effect using php-gtk in this example.
Overview
- Set up the radio buttons as outlined in the previous example.
- Specify any additional data to be passed along with the signal after the second argument in the connect statement.
- Note that your callback function definition should now contain the corresponding additional parameters to receive the additional data.
Sample Output
Sample Code
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| <?php
$window = new GtkWindow();
$window->connect_simple('destroy',array('Gtk','main_quit'));
$window->set_size_request(200, 100);
$vbox = new GtkVBox();
$window->add($vbox);
$vbox->pack_start(new GtkLabel('Select a State:'), false);
$radio = null;
$radio_button_def = array('New York'=>'NY', 'California'=>'CA', 'Washington'=>'WA');
foreach ($radio_button_def as $state_name => $state_code) {
$radio = new GtkRadioButton($radio, $state_name);
$radio->connect('toggled', 'on_toggle', $state_code); // note 1
$vbox->pack_start($radio, false);
}
$window->show_all();
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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
- By specifying
$state_code as the third argument, the 2-letter state code will also be passed to your callback function by php-gtk.
- The first parameter is the widget that emitted the signal. This is passed along automatically by php-gtk. The second parameter
$user_data is the additional data that you have specified in the connect statement.
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