Re: GTK3+ (3.14) drawing area on scrolledwindow. Bug?

[Rafael Senties Martinelli <rsm imap cc>]

Thanks so much Emmanuele!

 I actually had "return True" on my real code but I wasn't using the 
right cr.

-RSM


On 05/06/2015 12:07 PM, Emmanuele Bassi wrote:
> Hi;
>
> On 6 May 2015 at 10:35, rsm <rsm imap cc> wrote:
> >          for i in range(3):
> >              da=Gtk.DrawingArea()
> >              da.connect("draw", self.draw, [0.3, 0.4, 0.6], da)
> >              da.set_size_request(100,100)
> >              box.add(da)
> >
> >          sw.add(vp)
> >          vp.add(box)
> >          self.add(sw)
> >          self.show_all()
> >
> >      def draw(self, widget, event, color, da):
> >          cr = widget.get_property('window').cairo_create()
> >          cr.rectangle(0, 0, 100, 100)
> >          cr.set_source_rgb(color[0], color[1], color[2])
> >          cr.fill()
> The implementation of the GtkWidget::draw signal handler is wrong.
>
> The draw signal provides you with the Cairo context to draw on; you do
> not need (and actually you mustn't) use Gdk.Window.cairo_create().
>
> You're also passing the drawing area widget, but that's the widget
> that emits the signal, so it's pointless.
>
> A valid draw signal implementation is:
>
>    def draw(self, widget, cr):
>        cr.rectangle(x, y, width, height)
>        cr.set_source_rgb(red, green, blue)
>        cr.fill()
>        return True
>
> You should read the API reference for GTK+ 3.x:
>
>    https://developer.gnome.org/gtk/stable
>
> as well as the Python API reference:
>
>    http://lazka.github.io/pgi-docs/#Gtk-3.0
>
> Ciao,
>   Emmanuele.