Hi,
This is from the GTK documentation (used in IUP for the opacity
attribute):
"*gtk_widget_set_opacity ()*
void gtk_widget_set_opacity (*GtkWidget*
<https://developer.gnome.org/gtk3/stable/GtkWidget.html>* *widget*, *double
**opacity*);
Request the *widget* to be rendered partially transparent, with opacity 0
being fully transparent and 1 fully opaque. (Opacity values are clamped to
the [0,1] range.). This works on both toplevel widget, and child widgets,
although there are some limitations:
For toplevel widgets this depends on the capabilities of the windowing
system. On X11 this has any effect only on X screens with a compositing
manager running. See gtk_widget_is_composited()
<https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-is-composited>.
On Windows it should work always, although setting a window’s opacity after
the window has been shown causes it to flicker once on Windows.
For child widgets it doesn’t work if any affected widget has a native
window, or disables double buffering."
Best,
Scuri
Em 01/07/2016 04:09, "anon anon" <[email protected]> escreveu:
> i never would have figured a compositing manager had anything to do with
> it because i didnt know what a compositing manager was! i installed and
> tried xcompmgr and it looks promising because it makes all the windows fade
> in and out. it didnt work but i think i will try a better compositing
> manager tomorrow.
>
> > OK, it works in Xfce if I enable the compositing manager. So, try it in
> > your LXDE desktop.
> >
> > Germán.
> >
> > El vie, 01-07-2016 a las 05:48 +0300, anon anon escribió:
> >
> >> thanks a lot. something in gnome must be needed for that attribute. i
> dont even have it installed on my computer. fyi im using LXDE and i tried
> openbox but neither one works with opacity by default.
> >>
> >>> Maybe a problem with your window manager or session. A simple test
> don't
> >>> works for me on Xfce, but works perfectly on Gnome3. But if I first
> >>> start session on Gnome3, and then in Xfce, it works!. Seems like if
> Xfce
> >>> don't starts some service needed to handle transparency.
> >>>
> >>> Germán
> >>>
> >>> El vie, 01-07-2016 a las 02:03 +0300, anon anon escribió:
> >>>
> >>>> good it must be isolated on my computer. opacity is the only
> attribute on my computer i've noticed that has no effect. what do you all
> think could be wrong? i dont know but my guesses are:
> >>>> -i didnt compile iup correctly (maybe missing a dependency?)
> >>>> -libraries for opacity not getting loaded in linker. i compiled with:
> cc -o out in.c "$IUPLIBFOLDER/libiup.a" $(pkg-config --libs gtk+-2.0
> gdk-2.0)
> >>>> -maybe a random bug in the version of gtk i have
> >>>> thanks for clearing up the C question.
> >>>>
> >>>>> Hi,
> >>>>>
> >>>>> I just tested in GTK 2.20 and it worked ok with
> >>>>>
> >>>>> IupSetAttribute(dialog,"OPACITY","128");
> >>>>>
> >>>>> Notice that a value of "1" is almost fully transparent.
> >>>>>
> >>>>> The new C++ api will be a complement, not a replacement.
> >>>>>
> >>>>> Best,
> >>>>> Scuri
> >>>>>
> >>>>> On Thu, Jun 30, 2016 at 1:00 AM, anon anon <[email protected]>
> wrote:
> >>>>>
> >>>>>> using linux with gtk version greater than 2.12. compiles fine but
> opacity does not work. i didnt see anything about it on to do list etc. so
> im asking here. i didnt try to reproduce it on a different machine. anyone
> else have this problem? question not related: is iup 4.x going to support C?
> >>>>>>
> >>>>>> my C code:
> >>>>>>
> >>>>>> IupSetAttribute(dialog,"OPACITY","1");
> >>>>>>
> >>>>>>
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everyone, including kids. Get more information and register today.
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