Attachment 128758 Details for Bug 92776 – standalone get label text color in a notebook tab

standalone get label text color in a notebook tab

tabcolor.c (text/plain), 4.81 KB, created by Caolán McNamara on 2016-11-15 09:30:49 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Caolán McNamara

Created: 2016-11-15 09:30:49 UTC

Size: 4.81 KB

patch

obsolete

>/* gcc `pkg-config --cflags --libs gtk+-3.0` tabcolor.c -o tabcolor
> *
> * Ubuntu: 16.10
> * gtk3: 3.20.9 with default Ambiance theme
> *
> * color is reported as white, which is unexpected, what's wrong
> * with this code
> */
>
>#include <gtk/gtk.h>
>#include <string.h>
>
>static void
>append_element (GtkWidgetPath *path,
>                const char    *selector)
>{
>  static const struct {
>    const char    *name;
>    GtkStateFlags  state_flag;
>  } pseudo_classes[] = {
>    { "active",        GTK_STATE_FLAG_ACTIVE },
>    { "hover",         GTK_STATE_FLAG_PRELIGHT },
>    { "selected",      GTK_STATE_FLAG_SELECTED },
>    { "disabled",      GTK_STATE_FLAG_INSENSITIVE },
>    { "indeterminate", GTK_STATE_FLAG_INCONSISTENT },
>    { "focus",         GTK_STATE_FLAG_FOCUSED },
>    { "backdrop",      GTK_STATE_FLAG_BACKDROP },
>    { "dir(ltr)",      GTK_STATE_FLAG_DIR_LTR },
>    { "dir(rtl)",      GTK_STATE_FLAG_DIR_RTL },
>    { "link",          GTK_STATE_FLAG_LINK },
>    { "visited",       GTK_STATE_FLAG_VISITED },
>    { "checked",       GTK_STATE_FLAG_CHECKED },
>    { "drop(active)",  GTK_STATE_FLAG_DROP_ACTIVE }
>  };
>  const char *next;
>  char *name;
>  char type;
>  guint i;
>
>  next = strpbrk (selector, "#.:");
>  if (next == NULL)
>    next = selector + strlen (selector);
>
>  name = g_strndup (selector, next - selector);
>  if (g_ascii_isupper (selector[0]))
>    {
>      GType gtype;
>      gtype = g_type_from_name (name);
>      if (gtype == G_TYPE_INVALID)
>        {
>          g_critical ("Unknown type name `%s'", name);
>          g_free (name);
>          return;
>        }
>      gtk_widget_path_append_type (path, gtype);
>    }
>  else
>    {
>      /* Omit type, we're using name */
>      gtk_widget_path_append_type (path, G_TYPE_NONE);
>      gtk_widget_path_iter_set_object_name (path, -1, name);
>    }
>  g_free (name);
>
>  while (*next != '\0')
>    {
>      type = *next;
>      selector = next + 1;
>      next = strpbrk (selector, "#.:");
>      if (next == NULL)
>        next = selector + strlen (selector);
>      name = g_strndup (selector, next - selector);
>
>      switch (type)
>        {
>        case '#':
>          gtk_widget_path_iter_set_name (path, -1, name);
>          break;
>
>        case '.':
>          gtk_widget_path_iter_add_class (path, -1, name);
>          break;
>
>        case ':':
>          for (i = 0; i < G_N_ELEMENTS (pseudo_classes); i++)
>            {
>              if (g_str_equal (pseudo_classes[i].name, name))
>                {
>                  gtk_widget_path_iter_set_state (path,
>                                                  -1,
>                                                  gtk_widget_path_iter_get_state (path, -1)
>                                                  | pseudo_classes[i].state_flag);
>                  break;
>                }
>            }
>          if (i == G_N_ELEMENTS (pseudo_classes))
>            g_critical ("Unknown pseudo-class :%s", name);
>          break;
>
>        default:
>          g_assert_not_reached ();
>          break;
>        }
>
>      g_free (name);
>    }
>}
>
>static GtkStyleContext *
>create_context_for_path (GtkWidgetPath   *path,
>                         GtkStyleContext *parent)
>{
>  GtkStyleContext *context;
>
>  context = gtk_style_context_new ();
>  gtk_style_context_set_path (context, path);
>  gtk_style_context_set_parent (context, parent);
>  /* Unfortunately, we have to explicitly set the state again here
>   * for it to take effect
>   */
>  gtk_style_context_set_state (context, gtk_widget_path_iter_get_state (path, -1));
>  gtk_widget_path_unref (path);
>
>  return context;
>}
>
>static GtkStyleContext *
>get_style (GtkStyleContext *parent,
>           const char      *selector)
>{
>  GtkWidgetPath *path;
>
>  if (parent)
>    path = gtk_widget_path_copy (gtk_style_context_get_path (parent));
>  else
>    path = gtk_widget_path_new ();
>
>  append_element (path, selector);
>
>  return create_context_for_path (path, parent);
>}
>
>static void
>get_tab_label_color()
>{
>  GtkStyleContext *notebook_context;
>  GtkStyleContext *header_context;
>  GtkStyleContext *tabs_context;
>  GtkStyleContext *tab_context;
>  GtkStyleContext *label_context;
>  GdkRGBA text_color;
>
>  /* This information is taken from the GtkNotebook docs, see "CSS nodes" */
>  notebook_context = get_style (NULL, "notebook.frame");
>  header_context = get_style (notebook_context, "header.top");
>  tabs_context = get_style (header_context, "tabs");
>  tab_context = get_style (tabs_context, "tab");
>  label_context = get_style (tab_context, "label");
>
>  gtk_style_context_get_color(label_context, gtk_style_context_get_state(label_context), &text_color);
>  printf("tab label color is %s\n", gdk_rgba_to_string(&text_color));
>
>  g_object_unref (label_context);
>  g_object_unref (tabs_context);
>  g_object_unref (tab_context);
>  g_object_unref (header_context);
>  g_object_unref (notebook_context);
>}
>
>int main (int argc, char *argv[])
>{
>    gtk_init (&argc, &argv);
>    get_tab_label_color();
>}

Actions: View

Attachments on bug 92776: 117266 | 127947 | 127948 | 128758