gtk2/demos/gtk-demo/theming_style_classes.c

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/* CSS Theming/Style Classes
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*
* GTK+ uses CSS for theming. Style classes can be associated
* with widgets to inform the theme about intended rendering.
*
* This demo shows some common examples where theming features
* of GTK+ are used for certain effects: primary toolbars,
* inline toolbars and linked buttons.
*/
#include <gtk/gtk.h>
static GtkWidget *window = NULL;
GtkWidget *
do_theming_style_classes (GtkWidget *do_widget)
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{
GtkWidget *grid;
GtkBuilder *builder;
GError *err = NULL;
if (!window)
{
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_screen (GTK_WINDOW (window),
gtk_widget_get_screen (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Style Classes");
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gtk_container_set_border_width (GTK_CONTAINER (window), 12);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
builder = gtk_builder_new ();
gtk_builder_add_from_resource (builder, "/theming_style_classes/theming.ui", NULL);
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if (err)
{
g_error ("ERROR: %s\n", err->message);
return NULL;
}
grid = (GtkWidget *)gtk_builder_get_object (builder, "grid");
gtk_widget_show_all (grid);
gtk_container_add (GTK_CONTAINER (window), grid);
g_object_unref (builder);
}
if (!gtk_widget_get_visible (window))
{
gtk_widget_show (window);
}
else
{
gtk_widget_destroy (window);
window = NULL;
}
return window;
}