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Problem This article achieves the same objective as Part 1, that is, using Enter to move to next field. Just want to show you that php-gtk2 gives a lot of flexibility and rooms for creativity that allow us to achieve the same thing in many different ways as shown below:
Solution
- First set up the base as outlined in Part 1.
- Now instead of registering key-press-event on each GtkEntry, we register it on GtkWindow to detect the "Enter" key.
- If Enter key is pressed, we use GtkWidget::is_focus() to check if the cursor is on any of the GtkEntry field.
- If it's on one of the GtkEntry field we use GtkWidget::grab_focus() to move the cursor to the next field.
- For this example, if we reach the last field we move it back to the first field. This in a way "force" the user to click the submit button.
Sample Code Note: use if ($event->keyval!=65293) if your version of php-gtk2 does not have Gdk::KEY_Return defined.
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Use Enter to Move to Next Field - Part 2\n".
" using key-press-evnet on GtkWindow");
$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);
$fields = array('Item number', 'Item Description', 'Unit price', 'Quantity');
$field_size = array(120, 200, 80, 80);
$entry = array(); // to store the text entries
$table = new GtkTable();
display_table($table, $fields, $field_size); // display the table
$vbox->pack_start($table);
function display_table($table, $fields, $field_size) {
global $entry;
$row = 0;
foreach ($fields as $field) {
$label = new GtkLabel(" $field: ");
$alignment = new GtkAlignment(1, .5, 0, 0);
$alignment->add($label);
$table->attach($alignment, 0, 1, $row, $row+1,
Gtk::FILL, Gtk::SHRINK, 0, 0);
$entry[$row] = new GtkEntry();
$alignment = new GtkAlignment(0, .5, 0, 0);
$alignment->add($entry[$row]);
$entry[$row]->set_size_request($field_size[$row], -1);
$table->attach($alignment, 1, 2, $row, $row+1);
++$row;
}
}
// create a submit button
$button = new GtkButton('Submit');
$button->set_size_request(60, 28);
$button->connect('clicked', 'on_click');
$row = count($fields);
$alignment = new GtkAlignment(0, 0.5, 0, 0);
$alignment->add($button);
$table->attach($alignment, 1, 2, $row, $row+1);
$window->connect('key-press-event', 'on_keypress'); // note 1
$window->show_all();
Gtk::main();
function on_click($button) {
global $fields, $entry;
$i=0;
foreach($fields as $field) {
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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.
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- Have some doubt about the registration? Please read this forum article.
Explanation
- Register the key-press-event on the GtkWindow.
- If key press is not Enter, return a
false to let the default handler handles it.
- check if the cursor is on any of the GtkEntry field.
- Move focus to next row.
- If it's the last field, move focus back to the first field.
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