Problem
Suppose you would like to allow users to delete multiple rows in a linear list (i.e. using GtkTreeView with GtkListStore) as shown below:
Solution
- Enable multiple rows selection with GtkTreeSelection::set_mode(Gtk::SELECTION_MULTIPLE).
- Get the selected rows with GtkTreeselection::get_selected_rows().
- Remove each of the selected row with unset($model[$path]).
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 96 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 119 120 121 122 123 124 125 126 127 130 131 134 135 136 137 138 | <?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("Delete multiple rows in linear list - Part 1"); $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('Delete Selected Rows'), 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); 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(); $i = 0; $rows_to_remove = array(); foreach($selected_rows as $path) { $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; $rows_to_remove[] = $path[0]; // note 1 } for ($i=count($rows_to_remove)-1; $i>=0; --$i) { // note 2 print "remove row: $rows_to_remove[$i]\n"; unset($model[$rows_to_remove[$i]]); // note 3 } } ?> |
Output
As shown above.
Explanation
We make use of the code from How to process multiple selections in GtkTreeView?
What's new here:
- Store the corresponding path in the array
$rows_to_remove
. - Note that we need to remove the paths in reverse order. Try removing the paths from $i=1 to count($rows_to_remove) and you will know what I mean.
- Remove this row!
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