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Problem We've seen how to display a progress bar in a treeview in How to display progress bar in GtkTreeView using GtkCellRendererProgress?
Note that the progress bar in that example is a static one.
Suppose you would like to have a dynamic progress bar in a treeview as shown below. In this example, the progress bar will get updated once every second.
Solution
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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 1");
$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
$data = array(
array('1', 'every 1 sec', 0),
array('2', 'every 10 sec', 0),
array('3', 'every 1 minute', 0),
);
display_table ($vbox, $data);
$window->show_all();
Gtk::timeout_add(1000, 'update_progress', $view, $model); // note 1
Gtk::main();
function display_table($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);
} else {
$model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING,
Gtk::TYPE_DOUBLE);
}
$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);
} 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
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Explanation This example makes use of the code in How to display progress bar in GtkTreeView using GtkCellRendererProgress?
What's new here:
- Update the progress bar once every second.
- Calculate the elapsed time.
- Calculate the percentage for the corresponding row.
- Store the value of the percentage in the model.
- Retrieve the value of the percentage.
- Update 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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