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Sample Code 313: How to use drag and drop to shift rows in a GtkTreeView - Part 2 - using set_reorderable?
Written by kksou   
Tuesday, 28 August 2007
Problem

This is contributed by Dysmas de Lassus of France.

We have seen how we can manually enable drag and drop to shift rows in a treeview in the article How to use drag and drop to shift rows in a GtkTreeView - Part 1?

Dysmas pointed out that PHP-GTK2 actually has a built-in support for this as shown below:

How to use drag and drop to shift rows in a GtkTreeView - Part 2 - using set_reorderable?


Solution
  • All you need is to set up a standard GtkTreeView, and use the method GtkTreeView::set_reorderable(true) to enable reorder of rows by drag and drop.
  • As noted in the manual, "this function does not give you any degree of control over the order - any reordering is allowed. If more control is needed, you should probably handle drag and drop manually."
  • If you need more control, you could use the technique as outlined in How to use drag and drop to shift rows in a GtkTreeView - Part 1?.
  • Note that one advantage of using PHP-GTK2's internal method of set_reorderable(true) is that it will give a visual clue of which row the dragged item will be inserted into. As shown in the sample output above, you will see a thin border surrounding the row that will be inserted into. You will also see a copy of the entire dragged row.

Sample Code
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<?php
$window = new GtkWindow();
$window->set_size_request(400, 200);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Use drag and drop to shift rows\n".
"   Part 2 - use set_reorderable");
$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(new GtkLabel(), 0, 0);

// 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));

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) {
  • 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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Explanation

We use exactly the same code from the familiar GtkTreeView example How to display a 2D array in GtkTreeView - Part 5 - get user selection?

We only added one line here:

  1. Turn on PHP-GTK2's internal support for reordering of rows through drag and drop.

Related Articles

Sample codes contributed by Dysmas de Lassus:


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