Below is a revised version of the widget subclass example given here:
http://live.gnome.org/Vala/CustomWidgetSamples
It is update to work with gtk+-3.0. It took me a while to figure out what
needed to be changed to work with the latest gtk (there may still be some wonky
bits there, so feel free to revise further). Maybe it is useful for someone
else.
best -august.
----------------------------------------
using Gtk;
using Gdk;
using Cairo;
public class ValaWidget : Widget {
private static const string TEXT = "Hello World!";
private static const int BORDER_WIDTH = 10;
private Pango.Layout layout;
construct {
this.layout = create_pango_layout (TEXT);
set_has_window (false); //need this for
some reason, don't know why.
set_size_request (100, 100);
}
public override bool draw (Cairo.Context cr) {
int width = this.get_allocated_width();
int height = this.get_allocated_height();
// In this example, draw a rectangle in the foreground
color
//Gdk.cairo_set_source_color (cr,
this.style.fg[this.state]);
cr.set_source_rgba (0.5,0.5,0.5, 1);
cr.rectangle (BORDER_WIDTH, BORDER_WIDTH,
width - 2 * BORDER_WIDTH,
height - 2 * BORDER_WIDTH);
cr.set_line_width (5.0);
cr.set_line_join (LineJoin.ROUND);
cr.stroke ();
// And draw the text in the middle of the allocated
space
int fontw, fonth;
this.layout.get_pixel_size (out fontw, out fonth);
cr.move_to ((width - fontw) / 2,
(height - fonth) / 2);
Pango.cairo_update_layout (cr, this.layout);
Pango.cairo_show_layout (cr, this.layout);
return true;
}
static int main (string[] args) {
Gtk.init (ref args);
var win = new Gtk.Window (Gtk.WindowType.TOPLEVEL);
win.border_width = 5;
win.title = "Widget test";
win.destroy.connect (Gtk.main_quit);
var frame = new Frame ("Example Vala Widget");
win.add (frame);
var widget = new ValaWidget ();
frame.add (widget);
win.show_all ();
Gtk.main ();
return 0;
}
}
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