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Problem In How to remove nodes from GtkTreeView - Part 1?, we allow users to remove nodes from a directory tree by pressing the 'Delete' key.
Note that in that example, every time you highlight a row and delete a node, the row is deleted and the highlight is gone too.
Suppose you would like the highlight to remain (i.e. highlight the same row again) so that the user can continue to press the 'Delete' key to delete the next node as shown below:
Solution
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 2\n".
"highlight remains after a node is removed");
$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 = $model->get_path($iter); // note 1
//unset($model[$iter]);
$model->remove($iter); // note 2
$selection->select_path($path); // note 3
return true;
}
return false;
}
?>
|
Explanation The above code is an extension of the code from How to remove nodes from GtkTreeView - Part 1? .
What's new here:
- Recod the position of the currently highlighted row.
- Note that instead of
unset($model[$iter]), we can also use $model->remove($iter) to remove a node.
- Highlight the row at the position recorded in (1).
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February 23, 2008 10:11pm