Sample Code 404: How to open one window from another window - Part 1 - using GtkDialog? |
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Written by kksou
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Wednesday, 09 January 2008 |
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Problem Suppose you have set up an application that first displays a menu (let's call this app A). When the user selects an option, the corresponding application (let's call this B) will be launched as shown below:
Solution
- In this Part 1, we make use of GtkDialog instead of GtkWindow.
- With GtkDialog, you do not need to worry about how to pass the GTK main loop back and forth between app A and app B.
- The use of GtkDialog::run() and GtkDialog::destroy() simplify things a lot.
Sample Code 1
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| <?php
setup_appA(); // note 1
function setup_appA() {
$dialog = new GtkDialog();
$dialog->set_size_request(400, 200);
$vbox = $dialog->vbox;
// display title
$title = new GtkLabel("Opening app B from app A\n".
" Part 1 - using GtkDialog");
$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('This is app A'));
$vbox->pack_start($hbox = new GtkHBox(), 0);
$hbox->pack_start(new GtkLabel());
$hbox->pack_start($button = new GtkButton('Launch app B'), 0);
$hbox->pack_start(new GtkLabel());
$vbox->pack_start(new GtkLabel());
$button->connect('clicked', 'on_click', $dialog, 'A');
$dialog->set_has_separator(false);
$dialog->show_all();
$dialog->run();
$dialog->destroy();
}
function on_click($button, $dialog, $id) {
echo "on_click: $id!\n";
$dialog->destroy(); // note 2
if ($id=='A') {
setup_appB(); // note 3
} elseif ($id='B') {
setup_appA(); // note 4
}
}
function setup_appB() {
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Explanation
- Set up and display app A.
- To launch app B, we first destroy dialog A.
- Then set up and display app B.
- From app B back to app A, we first destroy dialog B, then set up and display app A.
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