366. How to display dynamic progress bar in GtkTreeView - Part 2?

Problem

In the previous example, I've showed you how to display a dynamic progress bar in a treeview.

Note that by default, the progress bar are displayed as percentages.

Suppose you would like to have display the progress bar as actual elapsed time in seconds (for row 0 and 1) and minutes (for row 2) as shown below:

How to display dynamic progress bar in GtkTreeView - Part 2?


Solution

  • First set up the dynamic progress bar as outlined in the previous article.
  • To change the text displayed on the progress bar, set the property 'text' of the progress bar with GObject::set_property().

Sample Code

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<?php
$window = new GtkWindow();
$window->set_size_request(400, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Display dynamic progress bar in TreeView - Part 2");
$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);

// the 2D table
$data = array(
array('1', 'every 1 sec', 0, 0),
array('2', 'every 10 sec', 0, 0),
array('3', 'every 1 minute', 0, 0),
);

display_table ($vbox, $data);

$window->show_all();

Gtk::timeout_add(1000, 'update_progress');
Gtk::main();

function display_table($vbox, $data) {
    global $view, $model;

    // 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_DOUBLE, GObject::TYPE_DOUBLE); // note 1
    } else {
        $model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING, 
            Gtk::TYPE_DOUBLE, Gtk::TYPE_DOUBLE); // note 1
    }
    $field_header = array('Sno', 'Description', 'Progress');
    $field_justification = array(0.0, 0.0, 0.0);

    // 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); ++$col) {
        if ($col==2) {
            $cell_renderer = new GtkCellRendererProgress();
            $column = new GtkTreeViewColumn($field_header[$col],
                $cell_renderer, 'value', $col);
        } elseif ($col==3) {
        } else {
            $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);
        }

        // set the header font and color
        $label = new GtkLabel($field_header[$col]);
        $label->modify_font(new PangoFontDescription("Arial Bold"));
        $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);
    }

    // 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

    global $start_time;
    $start_time = time();
}

function format_col($column, $cell, $model, $iter, $col_num) {
    $path = $model->get_path($iter);
    $row_num = $path[0];
    if ($col_num==2) {
        $percent = $model->get_value($iter, 2); // note 4
        $val = $model->get_value($iter, 3); // note 5
        $cell->set_property('value', $percent); // note 6
        if ($row_num==0) {
            $cell->set_property('text', "$val sec"); // note 7
        } elseif ($row_num==1) {
            $cell->set_property('text', "$val x 10sec"); // note 7
        } elseif ($row_num==2) {
            $cell->set_property('text', "$val min"); // note 7
        }
    }
    $row_color = ($row_num%2==1) ? '#dddddd' : '#ffffff';
    $cell->set_property('cell-background', $row_color);
}

function update_progress() {
    global $view, $model;
    $iter = $model->get_iter(0);
    global $start_time;
    $elapsed_seconds = time() - $start_time;
    $val = $elapsed_seconds % 60;
    $percent = $val / 60 * 100;
    $model->set($iter, 2, $percent); // note 2
    $model->set($iter, 3, $val); // note 3

    $iter = $model->get_iter(1);
    $v = floor($elapsed_seconds / 10);
    $val = $v % 6;
    $percent = $val / 6 * 100;
    $model->set($iter, 2, $percent); // note 2
    $model->set($iter, 3, $val); // note 3

    $iter = $model->get_iter(2);
    $val = floor($elapsed_seconds / 60);
    $percent = $val % 60;
    $model->set($iter, 2, $percent); // note 2
    $model->set($iter, 3, $val); // note 3

    return true;
}

?>

Output

As shown above.

 

Explanation

This example makes use of the code in How to display dynamic progress bar in GtkTreeView - Part 1?

What's new here:

  1. Store one more value (the actual seconds/minutes) in the model.
  2. Store the the percentage in the model.
  3. Store the actual time elapsed (in seconds or minutes) in the model.
  4. Retrieve the percentage.
  5. Retrieve the value.
  6. Update the progress bar (the percentage).
  7. Set the text to be displayed on the progress bar.

Note

Note that by default, the progress bar are displayed as percentages. In the next article, I'll show you how to display the progress bar as actual elapsed time in seconds (for row 0 and 1) and minutes (for row 2).

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