<?php
dl('php_gtk.so');
/* set up main window */
$window =& new GtkWindow();
$window->set_title('Temperature Conversion');
$window->set_policy(false, true, false);
$window->set_border_width(5);
$window->set_position(GTK_WIN_POS_CENTER);
/* create main vertical box */
$vbox =& new GtkVBox(false, 5);
/* create first row box */
$hbox =& new GtkHBox(false, 5);
/* add label */
$hbox->pack_start(new GtkLabel('Enter temperature:'), false);
/* add an entry field */
$t_entry =& new GtkEntry();
$hbox->pack_start($t_entry, true, true);
/* put first row box into vertical one */
$vbox->pack_start($hbox, false);
/* create an empty label and add to vertical box */
$res_label =& new GtkLabel();
$vbox->pack_start($res_label);
/* create third row box */
$hbox =& new GtkHBox(true, 5);
/* create buttons and connect signals */
$celsius_b =& new GtkButton('To Celcius');
$celsius_b->connect('clicked', 'on_celsius_clicked', $t_entry, $res_label);
$fahr_b =& new GtkButton('To Fahrenheit');
$fahr_b->connect('clicked', 'on_fahr_clicked', $t_entry, $res_label);
$exit_b =& new GtkButton('Exit');
$exit_b->connect('clicked', 'on_exit_clicked');
/* add buttons to third row box */
$hbox->pack_start($celsius_b);
$hbox->pack_start($fahr_b);
$hbox->pack_start($exit_b);
/* add third row box to vertical one */
$vbox->pack_start($hbox, false);
/* add vertical box to main window */
$window->add($vbox);
/* show window and all contained widgets */
$window->show_all();
/* have entry field grab keyboard focus */
$t_entry->grab_focus();
/* start the main loop */
gtk::main();
function on_celsius_clicked($button, $t_entry, $res_label)
{
/* get contents of the entry field */
$chars = $t_entry->get_chars(0, -1);
if (empty($chars) || !is_numeric($chars)) {
/* if invalid contents, indicate so, reselect entry field and focus on it */
$res_label->set_text('Invalid input');
} else {
/* if valid contents, perform conversion and output result */
$temp = (((int)$chars)-32)/1.8;
$res_label->set_text(sprintf("$chars Fahrenheit is %.1f Celsius", $temp));
}
$t_entry->select_region(0, -1);
$t_entry->grab_focus();
}
function on_fahr_clicked($button, $t_entry, $res_label)
{
$chars = $t_entry->get_chars(0, -1);
if (empty($chars) || !is_numeric($chars)) {
/* if invalid contents, indicate so, reselect entry field and focus on it */
$res_label->set_text('Invalid input');
} else {
/* if valid contents, perform conversion and output result */
$temp = ((int)$chars)*1.8+32;
$res_label->set_text(sprintf("$chars Celsius is %.1f Fahrenheit", $temp));
}
$t_entry->select_region(0, -1);
$t_entry->grab_focus();
}
function on_exit_clicked($button)
{
/* exit the main loop */
gtk::main_quit();
}
?>
