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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 37 39 42 43 44 45 46 47 48 49 50 51 52 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 87 88 89 90 91 | <?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 $field) { echo "$field: ".$entry[$i]->get_text()."\n"; ++$i; } } function on_keypress($widget, $event) { global $entry, $button; if ($event->keyval!=Gdk::KEY_Return) return false; // note 2 // use if ($event->keyval!=65293) if your version of php-gtk2 // does not have Gdk::KEY_Return defined $found = 0; for ($i=0; $i<count($entry); ++$i) { if ($entry[$i]->is_focus()) { // note 3 $found = 1; break; } } if ($found) { $next_row = $i+1; // note 4 if ($next_row>=count($entry)) $next_row = 0; // note 5 $entry[$next_row]->grab_focus(); // note 4 } } ?> |
Output
As shown above.
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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