076. How to display gif or jpg images in GtkTreeView - Part 2?

Problem

You have displayed gif/jpg/png images in a GtkTreeView column in Part 1 as shown below:

How to display gif or jpg images in GtkTreeView - Part 1?

Now you would like to combine the gif/jpg/png image and the text in the same column as shown below:

How to display gif or jpg images in GtkTreeView - Part 2?


Solution


Sample Code

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.

 ball_red.png
 ball_green.png

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<?php
$window = new GtkWindow();
$window->set_size_request(400, 280);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Display gif, jpg or png images in GtkTreeView - Part 2\n".
"                stuff image and text in same column");
$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('Red = below safety stock level (qty<10)'), 0, 0);
$vbox->pack_start(new GtkLabel('Green = above safety stock level (qty>=10)'), 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);

// the 2D table
$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));

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
    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(0.0, 0.0, 1.0, 1.0, .5);

    // 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); ++$col) {
        if ($field_header[$col] == 'Qty') {
            $column = new GtkTreeViewColumn();
            $cell_renderer = new GtkCellRendererPixbuf(); // note 1
            $column->pack_start($cell_renderer, false); 
            $column->set_cell_data_func($cell_renderer, "format_qty_pixbuf", $col); 

            $cell_renderer = new GtkCellRendererText(); // note 2
            $cell_renderer->set_property("xalign", $field_justification[$col]); 
            $column->pack_start($cell_renderer, true); 
            $column->set_attributes($cell_renderer, 'text', 2); // col 2 of the model
            $column->set_sort_column_id($col); 
            $column->set_cell_data_func($cell_renderer, "format_qty_text", $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);
            $column->set_cell_data_func($cell_renderer, "format_col", $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();

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

// self-defined function to format the price column
function format_col($column, $cell, $model, $iter, $col_num) {
    if ($col_num==3) {
        $amt = $model->get_value($iter, 3);
        $cell->set_property('text', '$'.number_format($amt,2));
    }
    set_row_color($cell, $model, $iter);
}

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

function format_qty_pixbuf($column, $cell, $model, $iter, $col_num) { // note 3
    $qty = $model->get_value($iter, 2);
    if ($qty<10) {
        $pixbuf = GdkPixbuf::new_from_file("ball_red.png");
    } else {
        $pixbuf = GdkPixbuf::new_from_file("ball_green.png");
    }
    $cell->set_property('pixbuf', $pixbuf);
    set_row_color($cell, $model, $iter);
}

function format_qty_text($column, $cell, $model, $iter, $col_num) { // note 4
    $qty = $model->get_value($iter, 2);
    $cell->set_property('text', $qty);
    set_row_color($cell, $model, $iter);
}

function set_row_color($cell, $model, $iter) { // note 5
    $path = $model->get_path($iter); // get the current path
    $row_num = $path[0]; // get the row number
    $row_color = ($row_num%2==1) ? '#dddddd' : '#ffffff'; // sets the row color for odd and even rows
    $cell->set_property('cell-background', $row_color); // sets the background color
}

?>

Output

As shown above.
 

Explanation

The above sample code is based on How to display a 2D array in GtkTreeView - Part 5 - get user selection? and How to display gif or jpg images in GtkTreeView - Part 1?

What's new here:

  1. Set up the GtkCellRendererPixbuf.
  2. Set up the GtkCellRenderer.
  3. Display the image.
  4. Display the text.
  5. Set the alternate row color.

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