Re: gtk3 layout background image



You were not changing the background with your theme: you were
programmatically replacing the base pixmap of the GdkWindow used by
GtkLayout. It was essentially a layering violation, and would actually
break your theme.

The API reference for each GTK widget should tell you the CSS styling
available; see the "CSS nodes" section, for instance, of GtkBox:
https://developer.gnome.org/gtk3/stable/GtkBox.html

Ciao,
 Emmanuele.


On 14 March 2017 at 13:55, Rúben Rodrigues <ruben_gr live com pt> wrote:
Thanks!

But in GTK+2 we could change background in layout with this:

// Set picture as background.
//        gdk_pixbuf_render_pixmap_and_mask (pixbuf, &background, NULL, 0);
//        style = gtk_style_new ();
//        style->bg_pixmap[0] = background;
//        homeWindow = GTK_WIDGET(gtk_builder_get_object(builder,
"layout_Home"));
//        gtk_widget_set_style (GTK_WIDGET(homeWindow), GTK_STYLE(style));

How i know witch containers draw background?

THanks


On 14-03-2017 12:55, Emmanuele Bassi wrote:
Not all GTK containers draw a background, mostly for historical
reasons. This has been true for GTK 1.x, 2.x, and 3.x.

In particular, GtkLayout does not draw any background with CSS, so you
will need to either subclass GtkLayout, override the GtkWidget::draw
virtual function, and call gtk_render_* functions yourself; or you
will need to put a GtkLayout into a parent container that does draw a
background. You will, of course, need to style the parent container's
background, not the GtkLayout itself.

Ciao,
  Emmanuele.


On 14 March 2017 at 12:43, Rúben Rodrigues <ruben_gr live com pt> wrote:
I verify that i can't use css provider, don't works.

My css file is :

GtkLayout#layout_Home.background{
      background-image: url('background.png');
}

GtkLabel#Home_Cooling_Tunnel1_Cooler_label1{
      color: white;
}

GtkLabel#Home_Sensors_MoistAvg_value{
      font-family: Segoe UI;
      font-weight: lighter;
      font-size: 25px;
}

And this code:

static void apply_css(GtkWidget *widget, GtkStyleProvider *provider)
{
gtk_style_context_add_provider(gtk_widget_get_style_context(widget),
GTK_STYLE_PROVIDER(provider),G_MAXUINT);
      if(GTK_IS_CONTAINER(widget))
          gtk_container_forall(GTK_CONTAINER(widget),(GtkCallback)
apply_css,provider);

}

GFile *file= g_file_new_for_path("custom.css");
          GtkStyleProvider *css_provider =
GTK_STYLE_PROVIDER(gtk_css_provider_new());
gtk_css_provider_load_from_file(GTK_CSS_PROVIDER(css_provider), file,
&error);
apply_css(gtk_builder_get_object(builder,"window_Main"),css_provider);

This is the code used in gtk3-demo and don't works for me.. Why????

THanks

On 14-03-2017 10:00, Rúben Rodrigues wrote:
Hi guys,

Finnaly i migrate my application to gtk+3. So, now i neet to change some
things like image background. I used css provider like in this :

custom.css file:

GtkLayout:layout_Home{
       background-color: black;
}


C Program:

GFile *file= g_file_new_for_path("custom.css");
           GtkCssProvider *css_provider = gtk_css_provider_get_default();
           gtk_css_provider_load_from_file(css_provider, file, &error);
           GtkStyleContext *context = gtk_style_context_new();
           gtk_style_context_add_provider(context,
GTK_STYLE_PROVIDER(css_provider),GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);

But nothing happens. I tried this too:

http://stackoverflow.com/questions/7375624/gtk3-window-background-image


Someone can help me?


THanks

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[@] ebassi [@gmail.com]


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