Sample Code 423: How to place a background image in GtkEventBox - Part 1 - tiled background image? |
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Written by kksou
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Monday, 28 January 2008 |
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Problem This is in response to Andreas' Post titled "Possible to add not tiled backgrounds".
Suppose you want to place some background image in a GtkEventBox as shown below:
Solution
Sample Code Note: The following image file is 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_blue3a.png |
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$window = new GtkWindow();
$window->set_size_request(480, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Place a background image in GtkEventBox\n".
" Part 1 - tiled background image");
$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);
$vbox->pack_start(new GtkLabel(), 0);
$eventbox = new GtkEventBox(); // note 1
$vbox->pack_start($eventbox);
$eventbox->add($vbox2 = new GtkVBox());
$vbox2->pack_start(new GtkLabel("this is an eventbox"));
$vbox2->pack_start(new GtkLabel("the blue ball is the bg image"));
// set background image
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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.
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- Have some doubt about the registration? Please read this forum article.
Explanation
- Create the eventbox.
- Load the background image. This works with all standard image file format such as .gif, .jpg or .png.
- Convert to pixmap.
- Get the GtkStyle corresponding to the eventbox.
- Make a copy of the style.
- Set the background image.
- Set the eventbox with the new style.
Note
- The image used above is saved without transpency.
- If you've tried placing a background image with transparency, you will find that using the technique described in this article doesn't work. The transparent areas will appear in black as shown below:
- If you need to place a background image with transparency, use the method as described in the next article.
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