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Problem This is in response to Fernando's post titled 'Remove the nodes of a tree'.
Instead of remove the parent node+child nodes when the user presses the 'Delete' key, he would like to delete only the child nodes as shown below:
Solution
- Use
$parent_node->children() to get all the first-level child nodes. Save these in an array.
- Remove each of the first-level child node with unset($model[$iter]) (Please see Part 1 for more explanations).
Sample Code Note 1: If you select "C:\", the program will run, but it will take a long time. You will see the processing, though, in the command window.
Note 2: On windows, you may see a warning "Gtk-WARNING: Could not find the icon 'stock_unknown'. The 'hicolor' theme
was not found either, perhaps you need to install it." This is from the GtkFileChooserButton. It's just a warning. You may ignore it, or go ahead and install it.
Note 3: 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.
 | folder_open.gif |
 | folder_closed.gif |
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| <?php
$window = new GtkWindow();
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Remove nodes from GtkTreeView - Part 3\n".
" remove child nodes only");
$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);
$vbox->pack_start($vbox2 = new GtkVBox(), 0, 0);
$vbox2->set_size_request(-1, 40);
$vbox2->pack_start(new GtkLabel("Highlight a row, and press ".
"'Delete' key to delete a file/folder"), 0);
$vbox2->pack_start(new GtkLabel("This is a demo. It won't ".
"actually delete the file/folder"), 0);
$vbox->pack_start($hbox = new GtkHBox());
$hbox->pack_start(new GtkLabel('Click to select a folder: '), 0, 0);
// set up model
if (defined("GObject::TYPE_STRING")) {
$model = new GtkTreeStore(GObject::TYPE_STRING);
} else {
$model = new GtkTreeStore(Gtk::TYPE_STRING);
}
// set up file chooser button
$file_chooser_button = new GtkFileChooserButton('Select the Folder',
Gtk::FILE_CHOOSER_ACTION_SELECT_FOLDER);
$file_chooser_button->set_size_request(320, -1);
$file_chooser_button->connect('selection-changed', 'on_selection_changed');
on_selection_changed($file_chooser_button);
$hbox->pack_start($file_chooser_button, 0, 0);
// set up scroll window
$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC,
Gtk::POLICY_AUTOMATIC);
$vbox->pack_start($scrolled_win);
// set up treeview
$view = new GtkTreeView($model);
$scrolled_win->add($view);
$view->set_size_request(400, 240);
//set up treeview columns
$column = new GtkTreeViewColumn();
// for image
$cell_renderer = new GtkCellRendererPixbuf();
$column->pack_start($cell_renderer, false);
$cell_renderer->set_property('pixbuf-expander-open',
GdkPixbuf::new_from_file('folder_open.gif'));
$cell_renderer->set_property('pixbuf-expander-closed',
GdkPixbuf::new_from_file('folder_closed.gif'));
// for filename
$cell_renderer = new GtkCellRendererText();
$column->pack_start($cell_renderer, true);
$column->set_attributes($cell_renderer, 'text', 0);
$view->append_column($column);
$column->set_title('Folders / Files');
$view->connect('key-press-event', 'on_keypress');
//display it
$window->show_all();
Gtk::main();
function on_selection_changed($button) {
$folder = $button->get_current_folder();
echo "folder: $folder\n";
populate_tree($folder);
}
function populate_tree($folder) {
global $model;
$model->clear();
$root = $folder;
$dir_list = array($root);
$nodes = array();
$nodes[$root] = null;
while(count($dir_list)>0) {
$dir = array_shift($dir_list);
echo "folder = $dir\n";
// add the directories first
if ($handle = opendir($dir)) {
while (false !== ($file = readdir($handle))) {
if ($file != "." && $file != "..") {
$fullpath = $dir.'/'.$file;
if (is_dir($fullpath)) {
$nodes[$fullpath] = $model->append($nodes[$dir],
array($file));
array_push($dir_list, $fullpath);
}
}
}
closedir($handle);
}
$num_files = 0;
// then add the files
if ($handle = opendir($dir)) {
while (false !== ($file = readdir($handle))) {
if ($file != "." && $file != "..") {
$fullpath = $dir.'/'.$file;
if (!is_dir($fullpath)) {
$nodes[$fullpath] = $model->append($nodes[$dir],
array($file));
++$num_files;
}
}
}
closedir($handle);
}
if ($num_files==0) $nodes[$fullpath] = $model->append($nodes[$dir],
array(''));
}
}
function on_keypress($widget, $event) {
if ($event->keyval==Gdk::KEY_Delete) {
global $view;
$selection = $view->get_selection();
list($model, $iter) = $selection->get_selected();
if ($iter==NULL) return true;
$path = $model->get_string_from_iter($iter);
$parent_node = $model[$iter];
$nodes_to_remove = array();
foreach ($parent_node->children() as $child_node) { // note 1
$iter = $child_node->iter; // note 2
$nodes_to_remove[] = $model->get_string_from_iter($iter); // note 3
}
for ($i=count($nodes_to_remove)-1; $i>=0; --$i) { // note 4
unset($model[$nodes_to_remove[$i]]); // note 5
}
$selection->select_path($path);
return true;
}
return false;
}
?>
|
Explanation The above code is an extension of the code from How to remove nodes from GtkTreeView - Part 2 - highlight remains? .
What's new here:
- Get all the first level of the child nodes.
- Get the corresponding iter.
- Store the corresponding path in the array
$nodes_to_remove
- Note that we need to remove the paths in reverse order. Try removing the paths from $i=1 to count(nodes_to_remove) and you will know what I mean.
- Remove this node!
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