Sample Code 460: How to drag and drop between two thumbnail images using GtkIconView with GtkTreeModelFilter - Part 2 - left to right insert? |
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Written by kksou
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Monday, 24 March 2008 |
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Problem This is in response to Wim Stockman's post titled "Drag Drop between 2 filtered GtkIconViews".
This solution is similar to that of How to drag and drop between two thumbnail images using GtkIconView - Part 2 - left to right insert?
The only difference is that this one uses GtkTreeModelFilter on top of a GtkListStore. This allows filtering of selected thumbnail images in the GtkIconView as shown below.
In Part 1, the dropped image is appended to the end of the dropped view.
In this Part 2, I'll show you how to insert image at the dropped location.
Key methods used: GtkTreeModelFilter::convert_iter_to_child_iter(), GObject::emit_stop_by_name(signal).
Solution
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\n".
"using GtkIconView with GtkTreeModelFilter\n".
" Part 2 - Left to right (insert)");
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 60);
$vbox->pack_start($title, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0); // add a small gap
// Set up a scroll window
$hbox = new GtkHBox();
$vbox->pack_start($hbox);
$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');
$view[0]->drag_source_set(Gdk::BUTTON1_MASK, array( array( 'text/plain', 0, 0)),
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');
$hbox->pack_start($left_vbox);
$hbox->pack_start($right_vbox);
$window->show_all();
Gtk::main();
function setup_iconview($id, $label) {
global $imagelist, $model, $modelfilter, $view;
$model[$id] = new GtkListStore(GdkPixbuf::gtype, Gtk::TYPE_STRING, Gtk::TYPE_BOOLEAN);
$modelfilter[$id] = new GtkTreeModelFilter($model[$id]);
$modelfilter[$id]->set_visible_column(2);
foreach($imagelist[$id] as $img) {
$pixbuf = GdkPixbuf::new_from_file($img);
$flag = (preg_match('/blue/', $img) || preg_match('/green/', $img)) ? 1 : 0;
$model[$id]->append(array($pixbuf, $img, $flag));
}
$view[$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();
$radio1 = setup_radio(null, 'display all', $label.'_all', $id);
$radio2 = setup_radio($radio1, 'display blue/green only',
$label.'_filter1', $id);
$vbox->pack_start($radio1, 0);
$vbox->pack_start($radio2, 0);
$vbox->pack_start($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) {
$drop_info = $widget->get_dest_item_at_pos($x, $y); // note 1
if ($drop_info) { // note 1
list($path, $position) = $drop_info; // note 2
$func = 'insert';
if ($position == Gtk::TREE_VIEW_DROP_BEFORE ||
$position == Gtk::TREE_VIEW_DROP_INTO_OR_BEFORE) {
$pos = $path[0];
} else {
$pos = $path[0]+1;
}
} else {
$func = 'append';
}
global $imagelist;
global $model, $modelfilter, $view;
$data = unserialize($data->data);
$dest_model = $widget->get_model();
$source_model = $view[0]->get_model();
foreach($data as $img) {
$i = $img[0];
// remove the source image first
if (method_exists($source_model, 'append')) {
$iter = $model[0]->get_iter($i);
} else {
$iter_filter = $modelfilter[0]->get_iter($i);
$iter = $modelfilter[0]->convert_iter_to_child_iter($iter_filter);
}
$img_name = $model[0]->get_value($iter, 1);
$model[0]->remove($iter);
// append the dragged image to the destination
if (method_exists($dest_model, 'append')) {
|
- 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 This example make use of the techniques from the following two articles:
What's new here:
- Check if this is an insert or an append.
- Get the insert position.
- As usual, for an iconview with filter, we need to get the iter of the underlying base model.
- For gtk+ v2.10 and above, you need to use emit_stop_by_name('drag_data_received') to gobble up the 'drag_data_received' signal for an iconview with filter. Try commenting this line. You will get the following error message:
Gtk-WARNING **: You must override the default
'drag_data_received' handler on GtkIconView when using models
that don't support the GtkTreeDragDest interface and enabling
drag-and-drop. The simplest way to do this is to connect to
'drag_data_received' and call g_signal_stop_emission_by_name()
in your signal handler to prevent the default handler from
running. Look at the source code for the default handler in
gtkiconview.c to get an idea what your handler should do.
(gtkiconview.c is in the GTK+ source code.) If you're using
GTK+ from a language other than C, there may be a more natural
way to override default handlers, e.g. via derivation.
What a long error message!
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