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Problem Suppose you have displayed two lists of thumbnail images using GtkIconView, and you would like to allow users to drag and drop images between the two views.
In this Part 3, we will allow drag and drop between the two views in both directions (i.e. left to right and right to left) as shown below:
Solution Use the technique as outlined in the article Part 2, and just do the same for the other direction.
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.
Sample Code The following image files are required by the sample code below. Please save a copy of the image files and put them in the same directory where you store the sample code.
 | square_red.jpg |
 | square_yellow.jpg |
 | square_green.jpg |
 | square_blue.jpg |
 | square_blue2.jpg |
 | square_blue3.jpg |
 | ball_red.png |
 | ball_yellow.png |
 | ball_blue3.png |
 | ball_blue3a.png |
 | ball_green3.png |
 | ball_green4.png |
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| <?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(600, 400);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Drag and drop between two thumbnail images using GtkIconView\n".
" Part 3 - 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); // add a small gap
// Set up the two views
$hpane = new GtkHPaned();
$vbox->pack_start($hpane);
// the thumbnail image lists
// 0 = left
// 1 = right
$imagelist[0] = array('square_red.jpg', 'square_yellow.jpg', 'square_green.jpg',
'square_blue.jpg', 'square_blue2.jpg', 'square_blue3.jpg');
$imagelist[1] = array('ball_red.png', 'ball_yellow.png',
'ball_blue3.png', 'ball_blue3a.png',
'ball_green3.png', 'ball_green4.png',);
$left_vbox = setup_iconview(0, 'left');
$right_vbox = setup_iconview(1, 'right');
// setup drag and drop for left to right
$view[0]->drag_source_set(Gdk::BUTTON1_MASK, array( array( 'text/plain', 0, 0)), // note 1
Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$view[0]->connect('drag-data-get', 'on_drag');
$view[1]->drag_dest_set(Gtk::DEST_DEFAULT_ALL,
array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$view[1]->connect('drag-data-received', 'on_drop', $view[0]);
// setup drag and drop for right to left
$view[1]->drag_source_set(Gdk::BUTTON1_MASK, array( array( 'text/plain', 0, 0)), // note 2
Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$view[1]->connect('drag-data-get', 'on_drag');
$view[0]->drag_dest_set(Gtk::DEST_DEFAULT_ALL,
array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE);
$view[0]->connect('drag-data-received', 'on_drop', $view[1]);
$hpane->add1($left_vbox);
$hpane->add2($right_vbox);
$view[0]->set_size_request(300, -1);
$window->show_all();
Gtk::main();
function setup_iconview($id, $label) {
global $imagelist, $model, $modelfilter, $view;
$model[$id] = new GtkListStore(GdkPixbuf::gtype, Gtk::TYPE_STRING);
foreach($imagelist[$id] as $img) {
$pixbuf = GdkPixbuf::new_from_file($img);
$model[$id]->append(array($pixbuf, $img));
}
$view[$id] = new GtkIconView($model[$id]);
$view[$id]->set_pixbuf_column(0); // col 0 of the model
$view[$id]->set_text_column(1); // col 1 of the model
$view[$id]->set_selection_mode(Gtk::SELECTION_MULTIPLE);
$view[$id]->set_columns(0);
$view[$id]->set_item_width(120);
$vbox = new GtkVBox();
$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC,
Gtk::POLICY_AUTOMATIC);
$vbox->pack_start($scrolled_win);
$scrolled_win->add($view[$id]);
return $vbox;
}
// process drag
function on_drag($widget, $context, $data, $info, $time) {
$selection = $widget->get_selected_items();
if (count($selection)==0) return; // return if there's no selection
$data->set_text(serialize($selection));
}
// process drop
function on_drop($widget, $context, $x, $y, $data, $info, $time, $src_view) { // note 3
$drop_info = $widget->get_dest_item_at_pos($x, $y);
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- 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 The above sample code is based on Part 2.
What's new here:
- Set up drag and drop from left to right.
- Set up drag and drop from right to left.
- Note how we're able to handle the drag and drop in both directions using just one signal handler.
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