168. How to display tooltips in GtkTreeView - Part 3 - no hardcoding of header height?

Problem

You have displayed tooltips for items in a treeview in Part 2. However, the height of the header has to be hardcoded in order to know if the mouse is in the header or below the header.

This example shows you how we can achive the same effect without any hardcoding of the height of the header as shown below:

How to display tooltips in GtkTreeView - Part 3 - no hardcoding of header height?


Solution

If you do not activate sorting in the tree column, you will find that php-gtk does not respond to any mouse event in the header region.

Of course, this means that there won't be any sorting when the user clicks on the header.


Sample Code

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<?php
$window = new GtkWindow();
$window->set_size_request(400, 216);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Display tooltips in a GtkTreeView - Part 3\n".
"No hardcoding of header heights");
$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);
$title->set_justify(Gtk::JUSTIFY_CENTER);
$alignment = new GtkAlignment(0.5, 0.5, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment, 0, 0);

// Set up treeview
$data = array(
    array('row0', 'item 42', 2, 3.1),
    array('row1', 'item 36', 20, 6.21),
    array('row2', 'item 21', 8, 9.36),
    array('row3', 'item 10', 11, 12.4),
    array('row4', 'item 7', 5, 15.5),
    array('row5', 'item 4', 17, 18.6),
    array('row6', 'item 3', 20, 21.73));

$view1 = display_table ($vbox, $data);

$window->show_all();
Gtk::main();

// the class to display tooltips in treeview
class TreeviewTooltips {

    function TreeviewTooltips($view) {
        // create the tooltip window
        $this->tooltip_window = new GtkWindow(Gtk::WINDOW_POPUP);
        $this->tooltip_window->set_name('gtk-tooltips');
        $this->tooltip_window->set_resizable(False);
        $this->tooltip_window->set_border_width(4);
        $this->tooltip_window->set_app_paintable(True);
        $this->tooltip_window->connect('expose-event',
            array(&$this, 'on_expose_event'));

        $label = new GtkLabel('');
        $label->set_line_wrap(True);
        $label->set_alignment(0.5, 0.5);
        $label->set_use_markup(True);
        $label->show();
        $this->tooltip_window->add($label);

        $this->set_view($view);
    }

    function set_view($view) {
        $view->connect('motion-notify-event', array(&$this, 'on_motion'));
        $view->connect('leave-notify-event', array(&$this, 'on_leave'));
    }

    function on_motion($view, $event) {
        $path_array = $view->get_path_at_pos($event->x, $event->y);
        $path = $path_array[0][0];
        $col = $path_array[1];
        $col_title = $col->get_title();

        if ($col!=null) {
            $size = $this->tooltip_window->size_request();
            // set the location of the tooltip
            $this->tooltip_window->move($event->x_root - $size->width/2,
                $event->y_root + 12);
            $this->tooltip_window->child->set_text("row $path col $col_title");
            $this->tooltip_window->show();
        }
    }

    function on_leave($view, $event) {
        $this->tooltip_window->hide();
    }

    function on_expose_event($tooltip_window, $event) {
        $size = $tooltip_window->size_request();
        $tooltip_window->style->paint_flat_box($tooltip_window->window,
            Gtk::STATE_NORMAL,
        Gtk::SHADOW_OUT, null, $tooltip_window, 'tooltip', 0, 0,
            $size->width, $size->height);
    }
}

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
    if (defined("GObject::TYPE_STRING")) {
        $model = new GtkListStore(GObject::TYPE_STRING, GObject::TYPE_STRING,
                    GObject::TYPE_LONG, GObject::TYPE_DOUBLE);
    } else {
        $model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING,
                    Gtk::TYPE_LONG, Gtk::TYPE_DOUBLE);
    }
    $field_header = array('Row #', 'Description', 'Qty', 'Price');
    $field_justification = array(0.5, 0.0, 0.5, 1.0);

    // Creates the view to display the list store
    $view = new GtkTreeView($model);
    $scrolled_win->add($view);

    // Creates the columns
    for ($col=0; $col<count($field_header); ++$col) {
        $cell_renderer = new GtkCellRendererText();
        $cell_renderer->set_property("xalign", $field_justification[$col]);
        $column = new GtkTreeViewColumn($field_header[$col],
            $cell_renderer, 'text', $col);
        $column->set_alignment($field_justification[$col]);
        //$column->set_sort_column_id($col); //note 1

        // set the header font and color
        $label = new GtkLabel($field_header[$col]);
        $label->modify_font(new PangoFontDescription("Times New Roman Bold 16"));
        $label->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
        $column->set_widget($label);
        $label->show();

        // setup self-defined function to display alternate row color
        $column->set_cell_data_func($cell_renderer, "format_col", $col);
        $view->append_column($column);
    }
    $tooltips = new TreeviewTooltips($view);

    // pupulates the data
    for ($row=0; $row<count($data); ++$row) {
        $values = array();
        for ($col=0; $col<count($data[$row]); ++$col) {
            $values[] = $data[$row][$col];
        }
        $model->append($values);
    }

    // setup selection
    $selection = $view->get_selection();
    $selection->connect('changed', 'on_selection');
    return $view;
}

// display alternate row color
function format_col($column, $cell, $model, $iter, $col_num) {
    $path = $model->get_path($iter); // get the current path
    $row_num = $path[0]; // get the row number
    if ($col_num==3) {
        $amt = $model->get_value($iter, 3);
        $cell->set_property('text', '$'.number_format($amt,2));
    }
    $row_color = ($row_num%2==1) ? '#dddddd' : '#ffffff';
    $cell->set_property('cell-background', $row_color);
}

// process user selection
function on_selection($selection) {
    list($model, $iter) = $selection->get_selected();
    if ($iter==null) return;
    $desc = $model->get_value($iter, 1);
    $qty = $model->get_value($iter, 2);
    $price = $model->get_value($iter, 3);
    echo "You have selected $desc: $qty ($price)\n";
}

?>

Output

As shown above.

 

Explanation

The above example is based on How to display tooltips in GtkTreeView - Part 1?.

What's new here:

  1. Just comment this line out, and you will find that the signal motion-notify-event will not be generated when the mouse is in the header region. This will allow you to get the correct readings for get_path_at_pos().

Note

  • The problem of using this method is that there is no more sorting when you click on the header.
  • However, if you would like to use this method, and you also want sorting, you can still "manually" implement sorting through top menu or right-mouse context-sensitive menu.
  • You can also implement sorting using the technique as outlined in How to sort treeview using GtkTreeModelSort?

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