339. How to process multiple selections in GtkTreeView?

Problem

We have seen how to process single row selection in a treeview in the article How to display a 2D array in GtkTreeView - Part 5 - get user selection?

Suppose you would like to allow users to select multiple rows as shown below:

How to process multiple selections in GtkTreeView?


Solution


Sample Code

1   
2   
3   
4   
5   
6   
7   
8   
9   
10   
11   
12   
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   
73   
74   
75   
76   
77   
78   
79   
80   
81   
82   
83   
84   
85   
86   
87   
88   
90   
91   
92   
93   
94   
95   
96   
100   
101   
102   
103   
104   
105   
106   
107   
108   
109   
110   
111   
112   
113   
114   
115   
116   
118   
119   
120   
121   
122   
123   
124   
125   
126   
127   
<?php
$window = new GtkWindow();
$window->set_size_request(400, 210);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Process multiple row selections in GtkTreeView");
$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);

$vbox->pack_start($hbox = new GtkHBox(), 0);
$hbox->pack_start($button = new GtkButton('Process'), 0);
$button->connect('clicked', 'on_process_button');

// the 2D table
$data = array(
array('row0', 'item 42', 2, 3.1),
array('row1', 'item 36', 20, 6.21),
array('row2', 'item 21', 8, 9.36),
array('row3', 'item 10', 11, 12.4),
array('row4', 'item 7', 5, 15.5),
array('row5', 'item 4', 17, 18.6),
array('row6', 'item 3', 20, 21.73));

$view = display_table($vbox, $data);

$window->show_all();
Gtk::main();

function display_table($vbox, $data) {

    // Set up a scroll window
    $scrolled_win = new GtkScrolledWindow();
    $scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC,
        Gtk::POLICY_AUTOMATIC);
    $vbox->pack_start($scrolled_win);

    // Creates the list store
    if (defined("GObject::TYPE_STRING")) {
        $model = new GtkListStore(GObject::TYPE_STRING, GObject::TYPE_STRING,
                    GObject::TYPE_LONG, GObject::TYPE_DOUBLE);
    } else {
        $model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING,
                    Gtk::TYPE_LONG, Gtk::TYPE_DOUBLE);
    }
    $field_header = array('Row #', 'Description', 'Qty', 'Price');
    $field_justification = array(0.0, 0.0, 0.5, 1.0);

    // Creates the view to display the list store
    $view = new GtkTreeView($model);
    $scrolled_win->add($view);

    // Creates the columns
    for ($col=0; $col<count($field_header); ++$col) {
        $cell_renderer = new GtkCellRendererText();
        $cell_renderer->set_property("xalign", $field_justification[$col]);
        $column = new GtkTreeViewColumn($field_header[$col],
            $cell_renderer, 'text', $col);
        $column->set_alignment($field_justification[$col]);
        $column->set_sort_column_id($col);

        // set the header font and color
        $label = new GtkLabel($field_header[$col]);
        $label->modify_font(new PangoFontDescription("Arial Bold"));
        $label->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000FF"));
        $column->set_widget($label);
        $label->show();

        // setup self-defined function to display alternate row color
        $column->set_cell_data_func($cell_renderer, "format_col", $col);
        $view->append_column($column);
    }

    // pupulates the data
    for ($row=0; $row<count($data); ++$row) {
        $values = array();
        for ($col=0; $col<count($data[$row]); ++$col) {
            $values[] = $data[$row][$col];
        }
        $model->append($values);
    }

    $selection = $view->get_selection();
    $selection->set_mode(Gtk::SELECTION_MULTIPLE); // note 1
    return $view;
}

// self-defined function to format the price column
function format_col($column, $cell, $model, $iter, $col_num) {
    $path = $model->get_path($iter); // get the current path
    $row_num = $path[0]; // get the row number
    if ($col_num==3) {
        $amt = $model->get_value($iter, 3);
        $cell->set_property('text', '$'.number_format($amt,2));
    }
    $row_color = ($row_num%2==1) ? '#dddddd' : '#ffffff';
    $cell->set_property('cell-background', $row_color);
}

function on_process_button($button) {
    global $view;
    $model = $view->get_model();
    $selection = $view->get_selection();
    list($model, $selected_rows) =
        $selection->get_selected_rows(); // note 2

    $i = 0;
    foreach($selected_rows as $path) { // note 3
        $iter = $model->get_iter($path);
        $desc = $model->get_value($iter, 1);
        $qty = $model->get_value($iter, 2);
        $price = $model->get_value($iter, 3);
        print "Selection $i: $desc: $qty ($price)\n";
        ++$i;
    }
}

?>

Output

As shown above.

 

Add comment


Security code
Refresh