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Problem This is in response to Edgarwilde's post titled "treeview leafs only"
Suppose you have set up a tree model as shown below:
And now you would like to allow users to have another view that shows only the leaves of the tree model as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Show Leaves only for a TreeModel");
$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(), 0);
$hbox->pack_start($button = new GtkButton('Show Leaves Only'), 0);
$tree_mode = 1;
$button->connect('clicked', 'on_click');
$data = array(
array ('id' => '101', 'parent' => '0', 'data' => 'a'),
array ('id' => '102', 'parent' => '101', 'data' => 'a1'),
array ('id' => '103', 'parent' => '102', 'data' => 'a11'),
array ('id' => '104', 'parent' => '102', 'data' => 'a12'),
array ('id' => '105', 'parent' => '101', 'data' => 'a2'),
array ('id' => '201', 'parent' => '0', 'data' => 'b'),
array ('id' => '202', 'parent' => '201', 'data' => 'b1'),
array ('id' => '203', 'parent' => '202', 'data' => 'b11')
);
display_table($vbox, $data);
$window->show_all();
Gtk::main();
function display_table($vbox, $data) {
// Set up a scroll window
$scrolled_win = new GtkScrolledWindow();
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC,
Gtk::POLICY_AUTOMATIC);
$vbox->pack_start($scrolled_win);
// Creates the list store
global $model, $model_leaves;
if (defined("GObject::TYPE_STRING")) {
$model = new GtkTreeStore(GObject::TYPE_LONG,
GObject::TYPE_STRING, GObject::TYPE_STRING); // note 1
$model_leaves = new GtkListStore(GObject::TYPE_LONG,
GObject::TYPE_STRING, GObject::TYPE_STRING); // note 2
} else {
$model = new GtkTreeStore(Gtk::TYPE_LONG,
Gtk::TYPE_STRING, Gtk::TYPE_STRING); // note 1
$model_leaves = new GtkListStore(Gtk::TYPE_LONG,
Gtk::TYPE_STRING, Gtk::TYPE_STRING); // note 2
}
$field_header = array('id', 'title', 'data');
// Set up the view
global $view;
$view = new GtkTreeView($model);
$scrolled_win->add($view);
// Creates the columns
for ($col=0; $col<count($field_header); ++$col) {
$cell_renderer = new GtkCellRendererText();
$column = new GtkTreeViewColumn($field_header[$col],
$cell_renderer, 'text', $col);
$view->append_column($column);
}
// pupulates the data
$nodes = array();
$nodes[0] = null; // root
foreach($data as $item) {
$id = $item['id'];
$parent = $item['parent'];
$data = $item['data'];
$nodes[$id] = $model->append($nodes[$parent],
array($id, "this is id $id", $data));
}
$view->expand_all();
}
function on_click($button) {
global $tree_mode;
if ($tree_mode) {
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Explanation The above example makes use of the code from How to display a tree structure from array? and How to iterate through a GtkTreeStore?
What's new here:
- The base tree model.
- The list store for the leaves.
- Loop through the entire tree model to extract just the leaves.
- Test if the node is a leave.
- Add the leave to the list store.
- Display the list store in the treeview!
- In the event that you just want to show the leaves, you can hide the first two columns. If not, just comment out these two lines.
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