Thanks Kimmo, somehow I haven't seen it in the manual page! But... I found it's not necessary: the thing which was preventing the transparency effect to work as expected was this instruction:
gdk_window_reparent(myapp->imgparamwin->window,gtk_widget_get_window(GTK_WIDGET (myapp->mainwin)),offset,offset); Without it I can get the transparent background just as Conny suggested, BUT ... without it the HildonAppMenu stops working: it shows up and immediately disappear! Luca Donaggio 2009/10/30 Kimmo Hämäläinen <kimmo.hamalai...@nokia.com> > On Fri, 2009-10-30 at 14:36 +0100, ext Luca Donaggio wrote: > > Thanks Conny and Kimmo, > > > > here are my progresses: > > > > I'm able to draw to the GtkWindow using Cairo only if I do it in a > > callback attached to the expose event of the window itself, but I'm > > still getting no transparency! > > I'm sure this is the problem with the window manager that Kimmo > > pointed out, but I don't know how to set the override-redirect flag > > apart from passing the correct value inside a GdkWindowAttr struct > > when manually creating a GdkWindow with gdk_window_new(), but I'm not > > doing this manually, so I'm lost here! > > gdk_window_set_override_redirect () sets it. You need to set it after > realizing (gtk_widget_realize ()) your window but before showing it. > gtk_widget_get_window () returns GdkWindow of your widget. > > -Kimmo > > > > > Luca Donaggio > > > > 2009/10/30 Kimmo Hämäläinen <kimmo.hamalai...@nokia.com> > > On Thu, 2009-10-29 at 17:29 +0100, ext Luca Donaggio wrote: > > > I'm trying to create a transparent, non-decorated popup > > GtkWindow on > > > top af my app HildonWindow and draw something on its > > underlying > > > GdkWindow object using cairo. > > > All I was able to obtain so far is a black (or whatever is > > the > > > background colour of the selected theme) rectangle -ie it's > > not > > > transparent and everything I paint in its GdkWindow with > > Cairo is not > > > showed at all. > > > > > > You may hit (at least) this hard-coded limitation: > > http://maemo.gitorious.org/fremantle-hildon- > > desktop/libmatchbox2/blobs/master/matchbox/core/mb-wm- > > client.c#line173 > > > > Currently alpha in dialogs and application windows is ignored > > because it > > allows for optimisations in the compositor. But if you set the > > override- > > redirect flag for the window, that should go around that > > (because the > > type of your window would be MBWMClientTypeOverride). > > > > -Kimmo > > > > > > > Here is the code I'm using: > > > > > > void create_image_details(GtkWidget *callerobj,app_data_t > > *myapp) { > > > PangoLayout *textbuff; > > > cairo_t *cr; > > > gint x0, y0, r, txtwidth, txtheight; > > > > > > /* For the widget itself let's use a GtkWindow */ > > > if ((myapp->imgparamwin != NULL) & GTK_IS_WINDOW(myapp- > > > >imgparamwin)) gtk_widget_destroy(myapp->imgparamwin); > > > myapp->imgparamwin = gtk_window_new(GTK_WINDOW_POPUP); > > > gtk_window_set_decorated(GTK_WINDOW (myapp- > > >imgparamwin),FALSE); > > > gtk_window_set_opacity(GTK_WINDOW (myapp- > > >imgparamwin),0); > > > gtk_widget_set_app_paintable(myapp->imgparamwin,TRUE); > > > gtk_widget_realize(myapp->imgparamwin); > > > /* gdk_window_set_back_pixmap(myapp->imgparamwin- > > > >window,NULL,FALSE); */ > > > /* Get the Cairo context */ > > > cr = gdk_cairo_create(GDK_DRAWABLE (myapp->imgparamwin- > > >window)); > > > textbuff = pango_cairo_create_layout(cr); > > > pango_layout_set_markup(textbuff,myapp->imgparam,-1); > > > pango_layout_get_pixel_size > > (textbuff,&txtwidth,&txtheight); > > > /* Draw a rounded rectangle */ > > > > > > [cairo stuff is here] > > > > > > cairo_destroy(cr); > > > g_object_unref(textbuff); > > > /* Show the widget */ > > > gtk_window_resize(GTK_WINDOW (myapp- > > >imgparamwin),txtwidth + (r * > > > 2),txtheight + (r * 2)); > > > gtk_window_move(GTK_WINDOW (myapp->imgparamwin),30,30); > > > gdk_window_reparent(myapp->imgparamwin->window,myapp- > > >image- > > > >window,30,30); > > > gtk_widget_show_all(myapp->imgparamwin); > > > } > > > > > > The window dimension after the gtk_window_resize() are > > correct -ie the > > > dimension of the PangoLayout containing the text to be > > rendered, so > > > something is definitely going on under the hood... but > > nothing is > > > displayed! > > > If I add some widget to the popoup window (for example a > > GtkLabel with > > > some text in it), it's rendered correctly, but, of course > > it's not > > > transparent! > > > > > > Any help, as always, is much appreciated! > > > > > > Luca Donaggio > > > > > > > >
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