230. How to setup a dialog box - Part 2 - simple yes no dialog?

Problem

To understand GtkDialog a little better, we will look at our second example to produce exactly the same output as the GtkDialog constructor example in the offical PHP-GTK2 documentation.

The example shows how to set up a simple yes-no dialog box as shown below:

How to setup a dialog box - Part 2 - simple yes no dialog?

Solution

The offical PHP-GTK2 documentation has a GtkDialog constructor example. It shows you how you can easily set up a GtkDialog by plugging in the title for the dialog box, and an array specifying the buttons in the GtkDialog constructor, the dialog box will be "magically" set up for you. Clicking the buttons will automatically close the button and returns a response code.
The problem is it shows you how (to set up the dialog box), but doesn't explain the why's. For example, what if you do not want the button to close the dialog box automatically when you click on any of the buttons? You want the dialog box to close if and only if the validation checks return no errors. Also, what if you want to have some text appearing just below the buttons?
To be able to do more advanced stuff using GtkDialog, the key is to understand that a GtkDialog is just like a GtkWindow. Yes, it's that simple!
I've reworked the GtkDialog constructor example in the offical PHP-GTK2 documentation so that it starts with a plain new GtkDialog(), just like we start a new window with new GtkWindow().
Once we have an empty GtkDialog, we first stuff whatever we want to the top area, which is just a standard vbox.
Then we add buttons to the action area. This can be easily done using the method GtkDialog::add_buttons().
$dialog->run() will return the response code of the button that the user has clicked.

Sample Code

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<?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 120);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Set up a simple yes/no dialog\n".
"Part 2 - using add_buttons");
$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, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);

$vbox->pack_start($hbox = new GtkHBox(), 0);
$hbox->pack_start(new GtkLabel('Response: '), 0);
$hbox->pack_start($response = new GtkEntry(), 0);
$hbox->pack_start($button = new GtkButton('Get Yes/No Response'), 0);
$button->connect('clicked', 'on_click');

$window->show_all();
Gtk::main();

function on_click() {
    setup_yes_no_dialog();
}

function setup_yes_no_dialog() {

    $dialog = new GtkDialog(); // note 1
    $dialog->set_title('Yes/No Dialog');
    $label = new GtkLabel("Do you like PHP-Gtk2?");
    $dialog->vbox->pack_start($label); // note 2

    $dialog->add_buttons(array( // note 3
        Gtk::STOCK_YES, Gtk::RESPONSE_YES, //
        Gtk::STOCK_NO, Gtk::RESPONSE_NO //
    )); //

    $dialog->show_all();
    $response_id = $dialog->run(); // note 4
    $dialog->destroy(); // note 5

    global $response;
    switch($response_id) { // note 6
        case Gtk::RESPONSE_YES:
            $response->set_text("$response_id (Yes)"); // note 7
            break;
        case Gtk::RESPONSE_NO:
            $response->set_text("$response_id (No)");
            break;
    }

}

?>

Output

Explanation

Create a new dialog.
Create and stuff the question (as a GtkLabel) in the top area.
Add the buttons to the action area.
Run the dialog.
Destroy the dialog.
Process the response.
Echo the response in the GtkEntry. Note that RESPONSE_YES has an integer value of -8. RESPONSE_YES has an integer value of -9.

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230. How to setup a dialog box - Part 2 - simple yes no dialog?

Problem

Solution

Sample Code

Output

Explanation

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