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by kksou
Sample Code 391: How to create a flashing button - Part 1? |
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Written by kksou
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Sunday, 16 December 2007 |
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Problem You would like to create a flashing background color as shown below. The 'Click Me' button will keep flashing until the user clicks on the button.
Solution
Sample Code 1
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| <?php
$window = new GtkWindow();
$window->connect_simple('destroy', array( 'Gtk', 'main_quit'));
$window->set_size_request(400,150);
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Create a Flashing Button - 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, 60);
$vbox->pack_start($title, 0, 0);
$vbox->pack_start($hbox=new GtkHBox(), 0, 0);
$button = create_button($hbox, 'Click Me!', '#FFCC66');
$timeout_handle = Gtk::timeout_add(500, 'flash', $button, '#FFCC66'); // note 1
$window->realize();
$org_bg = $window->get_style()->bg[Gtk::STATE_NORMAL]; // note 2
$window->show_all();
Gtk::main();
function create_button($hbox, $button_label, $bg_color) {
$button = new GtkButton($button_label);
$button->set_size_request(80, 32);
$button->modify_bg(Gtk::STATE_NORMAL,
GdkColor::parse($bg_color));
$hbox->pack_start($button, 1, 0);
$button->connect('clicked', "on_button", $button_label);
return $button;
}
function on_button($button, $button_label) {
echo "You have clicked: $button_label!\n";
global $timeout_handle;
Gtk::timeout_remove($timeout_handle); // note 4
}
function flash($button, $bgcolor_str) {
static $i=1;
global $org_bg;
$bgcolor = GdkColor::parse($bgcolor_str);
$bg = ($i==1) ? $org_bg : $bgcolor; // note 3
$button->modify_bg(Gtk::STATE_NORMAL, $bg); // note 3
$i = ($i==1) ? 0 : 1;
return true;
}
?>
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Explanation The above code is based on How to set the background color of GtkButton?
What's new here:
- Call the function
flash() once every 500ms (i.e. half a second).
- Get the default gray color of the button.
- Alternate the background color of the button to create the flashing effect.
- Stops the flashing!
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