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Problem I've showed you how to popup a context-sensitive menu with right mouse click in a treeview in the article How to display context sensitive popup menu with right mouse click in GtkTreeView?
If you have tried that example, you will notice that the menu does not appear when you click in the treeview header.
Suppose you would like to have the popup menu too when the user right click on the treeview header as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 200);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel(" Display context sensitive popup menu\n".
"with right mouse click on treeview column header");
$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
$data = array(
array('row0', 'item 42', 2, 3.1),
array('row1', 'item 36', 20, 6.21),
array('row2', 'item 21', 8, 9.36),
array('row3', 'item 10', 11, 12.4),
array('row4', 'item 7', 5, 15.5),
array('row5', 'item 4', 17, 18.6),
array('row6', 'item 3', 20, 21.73));
display_table($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, 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);
// 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);
$col_header_button = get_col_header_button($column); // note 1
$col_header_button->connect('button-press-event', // note 2
'on_button_press', $col);
if ($col==3) {
$col_header_button = get_col_header_button($column);
$col_header_button->modify_bg(Gtk::STATE_NORMAL,
GdkColor::parse('#ffff00'));
$col_header_button->modify_bg(Gtk::STATE_PRELIGHT,
GdkColor::parse('#ffff00'));
}
}
// pupulates the data
for ($row=0; $row<count($data); ++$row) {
$values = array();
for ($col=0; $col<count($data[$row]); ++$col) {
$values[] = $data[$row][$col];
}
$model->append($values);
}
$selection = $view->get_selection();
$selection->connect('changed', 'on_selection');
}
function on_button_press($widget, $event, $col_num) {
if ($event->button==1) return false; // let php-gtk2 handles this
if ($event->button==2) return true; // do nothing
if ($event->button==3) { // note 3
// get the row and column
popup_menu($col_num); // displays the popup menu
return true;
}
}
// self-defined function to format the price column
function format_col($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));
}
print "You have selected $desc: $qty ($price)\n";
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
Explanation The above code is based on that of How to set the background color of the column header of a treeview?
We also make use of the code from How to display context sensitive popup menu with right mouse click in GtkTreeView? to detect right mouse click and popup the context sensitive menu.
What's new here:
- Get hold of the GtkButton that holds the treeview column header.
- Set up the signal
button-press-event.
- Check for right mouse click on the treeview header button.
- You can set up your context-sensitive menus here base on the variable
$col_num that tells you which column the user has clicked on.
- Popup the menu!
- This is the function that returns you the pointer to the GtkButton holding the treeview column header.
Note
As I've mentioned in the article How to set the background color of the column header of a treeview?
- I know there are some people that don't like the method presented here because it's accessing some of the internal data structures. If you don't like it, then don't use this method.
- However, if you're like me, who faced a client that doesn't take "no, it's not supported yet" for an answer, at least you have an immediate workable solution for popping up menus on right mouse click on treeview headers.
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