|
Problem You want to change the buttons on the fly depending on the selection from a pulldown menu as shown below:
For example, when you select "This is item 2", the buttons will change to:
" />*/ ?>
Solution
- Create pulldown menu with GtkComboBox
- Create all the buttons first and hide them.
- Depending on the selection, set the labels of the buttons, and show or hide the buttons accordingly.
Sample Code 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
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
| <?php
$window = new GtkWindow();
$window->connect_simple('destroy', array( 'Gtk', 'main_quit'));
$window->set_size_request(400,200);
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Changing buttons on-the-fly based on selection");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 60);
$vbox->pack_start($title, 0, 0);
// the selection
$options = array(
'item1' => 'This is item 1',
'item2' => 'This is item 2',
'item3' => 'This is item 3',
'item4' => 'This is item 4');
// the buttons
$buttons = array( // note 1
'item1' => array('File', '', 'Exit'),
'item2' => array('button2-1', 'button2-2', 'button2-3'),
'item3' => array('', 'button3-2', 'Exit'),
'item4' => array('', '', 'Exit')
);
$button_ptr = array();
$button_handler = array();
// setup the buttons
$vbox->pack_start($hbox=new GtkHBox(), 0, 0); // creates a hbox container
for ($i=0; $i<3; ++$i) { // 3 because we have 3 buttons
$hbox2 = new GtkHBox(); // forms the base of button
$button = new GtkButton(''); // creates an empty button
$button->set_size_request(100, 32); // set the size of button
$button_ptr[$i] = $button; // store the pointer to button
$hbox2->set_size_request(120, 40); // pack the button inside the base
$hbox2->pack_start($button, 0, 1); // to fix the position of the 3 buttons
$hbox->pack_start($hbox2, 0, 0); // place the buttons on the same row
}
$vbox->pack_start(new GtkLabel(''), 0, 0); // give a slight gap
// setup the pulldown menu
$vbox->pack_start($hbox=new GtkHBox(), 0, 0); // creates a hbox container
$hbox->pack_start(new GtkLabel('Select: '), 0, 0); // to hold label and combobox
$combobox = new GtkComboBox(); // create the combobox
if (defined("GObject::TYPE_STRING")) {
$model = new GtkListStore(GObject::TYPE_STRING); // create the model
} else {
$model = new GtkListStore(Gtk::TYPE_STRING); // create the model
}
$combobox->set_model($model); // binds the model to combobox
$cellRenderer = new GtkCellRendererText(); // setup cellrenderer
$combobox->pack_start($cellRenderer); // set up first column
$combobox->set_attributes($cellRenderer, 'text', 0); // value map to $model[0]
$combobox->connect('changed', 'on_selection_change', $options, $buttons); // set up event handler
foreach($options as $choice) { $model->append(array($choice)); } // pupulates data
$hbox->pack_start($combobox, 0, 0); // show it besides the label "Select:"
function on_selection_change($combobox, $options, $buttons) {
global $button_ptr, $button_handler;
$model = $combobox->get_model(); // get the model
$selected_value = $model->get_value($combobox->get_active_iter(), 0); // get the selected value
$key = array_search($selected_value, $options); // get the key
echo "You have selected: $selected_value (key=$key)!\n";
for ($i=0; $i<3; ++$i) {
$button_value = $buttons[$key][$i];
if ($button_value == '') {
|
- 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.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
Explanation Please refer to How to setup and process GtkComboBox? which explains in more detail how to set up a combobox.
- The array
$buttons holds the values of the buttons for each selection. You can hide a button by setting it to ''.
- With php-gtk, you can handle the button clicks of all possible combinations of buttons with just one simple event handler. You just need to pass the right variables along with the events.
- Remember to disconnect all unused button-click events! Try leaving this out, and you will understand why you need to do this.
Related Articles
User reviews There are no user reviews yet. Note: You have to be a registered member to leave a comment. Free registration here. |
