312. How to drag and drop between 2 GtkTreeViews - Part 4 - in both directions with insert?

Problem

This example achieves exactly the same as that of How to drag and drop between 2 GtkTreeViews - Part 3 - left to right with insert?

The only difference is that it now supports dragging and dropping with insert in both directions (i.e. left to right and right to left) as shown below.

How to drag and drop between 2 GtkTreeViews - Part 4 - in both directions with insert?


Solution

Please refer to the explanations in How to drag and drop between 2 GtkTreeViews - Part 3 - left to right with insert?. The technique used is exactly the same.


Sample Code

Important Note: This only works for PHP-GTK2 compliled with gtk+ v2.10 and above. If you are using an older version, for linux, you may follow the step-by-step instructions to recompile php-gtk2 with gtk+ v2.10. For windows, please refer to How to install php gtk2 on windows? You may also want to take a look here to see some of the new exciting PHP-GTK2 Functionalities.

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<?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(600, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Drag and Drop between 2 TreeViews\n".
"Part 4 (in both directions) with insert");

$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);
$vbox->pack_start($hbox = new GtkHBox());

// Set up treeview 1
$data1 = 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));
$view1 = display_table ($hbox, $data1);

// setup drag for left side
$view1->drag_source_set(Gdk::BUTTON1_MASK,
    array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$view1->connect('drag-data-get', 'on_drag');

// setup drop for left side
$view1->drag_dest_set(Gtk::DEST_DEFAULT_ALL,
    array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$hbox->pack_start(new GtkLabel('  '), 0, 0);

// Set up treeview 2
$data2 = array(
    array('row7', 'item 127', 105, 115.5),
    array('row8', 'item 124', 117, 118.6),
    array('row9', 'item 123', 120, 121.73));
$view2 = display_table ($hbox, $data2);

// setup drop for right side
$view2->drag_dest_set(Gtk::DEST_DEFAULT_ALL,
    array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$view2->connect('drag-data-received', 'on_drop', $view1);

// setup drag for right side
$view2->drag_source_set(Gdk::BUTTON1_MASK,
    array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$view2->connect('drag-data-get', 'on_drag');

// this is delayed till here because we need the ID of $view2
$view1->connect('drag-data-received', 'on_drop', $view2);

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

// display a 2D table in treeview
function display_table($container, $data) {

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

    // setup selection
    $selection = $view->get_selection();
    $selection->connect('changed', 'on_selection');
    return $view;
}

// format treeview columns
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'; // sets the row color for odd and even rows
    $cell->set_property('cell-background', $row_color); // sets the background color
}

// the function that is called when user selects a row
function on_selection($selection) {
    list($model, $iter) = $selection->get_selected();
    if ($iter==null) return;
    $desc = $model->get_value($iter, 1);
    $qty = $model->get_value($iter, 2);
    $price = $model->get_value($iter, 3);
    print "You have selected $desc: $qty ($price)\n";
}

function on_drag($widget, $context, $data, $info, $time) {
    $selection = $widget->get_selection();
    list($model, $iter) = $selection->get_selected();
    if ($iter==null) return;
    $id = $model->get_value($iter, 0);
    $desc = $model->get_value($iter, 1);
    $qty = $model->get_value($iter, 2);
    $price = $model->get_value($iter, 3);
    $data->set_text(serialize(array($id, $desc, $qty, $price)));
}

function on_drop($widget, $context, $x, $y, $data, $info, $time, $src_view) {
    // remove from src first
    $src_selection = $src_view->get_selection();
    list($src_model, $src_iter) = $src_selection->get_selected();
    if ($src_iter==null) {
        return;
    }
    $src_model->remove($src_iter);

    $data2 = unserialize($data->data);
    $model = $widget->get_model();

    $drop_info = $widget->get_dest_row_at_pos($x, $y); // note 1
    if ($drop_info) {
        list($path, $position) = $drop_info; // note 2
        if ($position == Gtk::TREE_VIEW_DROP_BEFORE || // note 3
        $position == Gtk::TREE_VIEW_DROP_INTO_OR_BEFORE) { 
            $model->insert($path[0], $data2) ; // note 4
        } else {
            $model->insert($path[0]+1, $data2) ; // note 5
        }
    } else {
        $model->append($data2); // note 6
    }

}

?>

Output

As shown above.

 

Explanation

We make use of the code from How to drag and drop between 2 GtkTreeViews - Part 2 - in both directions?

What's new here:

  1. Get the drop information.
  2. Get the path and position of the drop information.
  3. Check whether it's on, before or after the row.
  4. If it's on or before, we insert into the current row.
  5. If it's after, we insert into the next row (i.e. current_row + 1).
  6. If it's not on, before or after, we append the item to the end of the treeview.

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