Re: [Vala] Use alpha in GtkColorButton in GTK3 with Vala

[Satyajit Sahoo <satyajit happy gmail com>]

Thanks all. It works perfectly. I hope the code samples in valadoc.org can
be updated though.


On 2 June 2013 02:41, Evan Nemerson <evan coeus-group com> wrote:

> On Sat, 2013-06-01 at 22:27 +0200, Jonas Kulla wrote:
> > 2013/6/1 Satyajit Sahoo <satyajit happy gmail com>
> >
> > > I want to use an alpha value in the color buttons in my app -
> > > https://github.com/satya164/elegance-colors
> > >
> > > Currently I'm using colorbutton.set_use_alpha (true);, as documented in
> > > http://www.valadoc.org/#!api=gtk+-3.0/Gtk.ColorButton
> > >
> > > But, while compiling, I get warnings saying,
> /home/satya/Workspace/elegance-colors/elegance-colors-prefs.vala.c:4706:2:
> > > warning: ‘gtk_color_button_set_use_alpha’ is deprecated (declared at
> > > /usr/include/gtk-3.0/gtk/gtkcolorbutton.h:95): Use
> > > 'gtk_color_chooser_set_use_alpha' instead [-Wdeprecated-declarations]
> > >
> > > The code samples in the valadoc website are outdated and the sample on
> > > gnome's website doesn't use alpha. Can anyone help me fix the warning
> > > messages?
> > >
> > > I'm using GTK 3.8 and Vala 0.20.1.
> >
> > Hi,
> >
> > looking at the documentation, it seems that the "use-alpha" property
> > was moved out of ColorButton (and probably other color widgets)
> > and unified in the ColorChooser interface, but left in those concrete
> > classes for backwards compatibility. The problem I think is that
> > when you do "myButton.set_use_alpha()" valac cannot know if you
> > mean ColorButton::set_use_alpha or ColorChooser::set_use_alpha
> > and just defaults to the former.
> >
> > Normally I would tell you to just ignore warnings that gcc spits out
> > (as there are others caused by bugs in valac), but if you really want
> > them gone you could remove all the use-alpha related calls from
> > the ColorButton class in the gtk3 vapi (although others compiling
> > your project would still get them).
>
> You can cast to Gtk.ColorChooser:
>
>   ((Gtk.ColorChooser) myButton).set_use_alpha (true);
>
> Unfortunately, we can't really "fix" the bindings right now since
> removing Gtk.ColorButton.set_use_alpha means that the bindings stop
> working for older versions of GTK+.
>
> At some point we may be able to mostly resolve this in valac (after
> switching GTK+ to GIR and once Florian's recent work on the [Version]
> attribute lands) by introducing a flag to remove deprecated items from
> the tree when targeting a newer version of the library.
>
>
> -Evan


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Satyajit Sahoo
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