gtklabel.c 23.4 KB
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 /* GTK - The GIMP Toolkit
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 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
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 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
#include <string.h>
#include "gtklabel.h"
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#include "gdk/gdkkeysyms.h"
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#include "gdk/gdki18n.h"
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enum {
  ARG_0,
  ARG_LABEL,
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  ARG_PATTERN,
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  ARG_JUSTIFY
};

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typedef struct _GtkLabelULine GtkLabelULine;
struct _GtkLabelWord
{
  GdkWChar *beginning;
  gint length;
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  /* FIXME:
   * We need (space,width) only before we've set (x,y), so to save
   * memory, these pairs should really be wrapped in a union.
   * I haven't yet figured out how to do this without making the code
   * look ugly. 
   */
  gint space;
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  gint width;
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  gint x;
  gint y;
  GtkLabelWord *next;
  gint uline_y;
  GtkLabelULine *uline;
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};

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struct _GtkLabelULine
{
  gint x1;
  gint x2;
  gint y;
  GtkLabelULine *next;
};
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static void gtk_label_class_init   (GtkLabelClass  *klass);
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static void gtk_label_init	   (GtkLabel	   *label);
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static void gtk_label_set_arg	   (GtkObject	   *object,
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				    GtkArg	   *arg,
				    guint	    arg_id);
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static void gtk_label_get_arg	   (GtkObject      *object,
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				    GtkArg	   *arg,
				    guint	    arg_id);
static void gtk_label_finalize	   (GtkObject	   *object);
static void gtk_label_size_request (GtkWidget	   *widget,
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				    GtkRequisition *requisition);
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static gint gtk_label_expose	   (GtkWidget	   *widget,
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				    GdkEventExpose *event);
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static GtkLabelWord * gtk_label_word_alloc (void);
static GtkLabelULine * gtk_label_uline_alloc (void);
static void gtk_label_free_words   (GtkLabel       *label);
static void gtk_label_free_ulines   (GtkLabelWord *word);
static gint gtk_label_split_text   (GtkLabel * label);
static void gtk_label_finalize_lines    (GtkLabel * label, gint line_width);
static void gtk_label_finalize_lines_wrap(GtkLabel * label, gint line_width);
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static GtkMiscClass *parent_class = NULL;

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static GMemChunk *word_chunk = 0;
static GtkLabelWord *free_words = 0;
static GMemChunk *uline_chunk = 0;
static GtkLabelULine *free_ulines = 0;
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GtkType
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gtk_label_get_type (void)
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{
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  static GtkType label_type = 0;
  
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  if (!label_type)
    {
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      static const GtkTypeInfo label_info =
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      {
	"GtkLabel",
	sizeof (GtkLabel),
	sizeof (GtkLabelClass),
	(GtkClassInitFunc) gtk_label_class_init,
	(GtkObjectInitFunc) gtk_label_init,
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        /* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
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	(GtkClassInitFunc) NULL,
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      };
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      label_type = gtk_type_unique (gtk_misc_get_type (), &label_info);
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      gtk_type_set_chunk_alloc (label_type, 32);
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    }
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  return label_type;
}

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static void
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gtk_label_class_init (GtkLabelClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
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  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
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  parent_class = gtk_type_class (gtk_misc_get_type ());
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  gtk_object_add_arg_type ("GtkLabel::label", GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_LABEL);
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  gtk_object_add_arg_type ("GtkLabel::pattern", GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_PATTERN);
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  gtk_object_add_arg_type ("GtkLabel::justify", GTK_TYPE_JUSTIFICATION, GTK_ARG_READWRITE, ARG_JUSTIFY);
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  object_class->set_arg = gtk_label_set_arg;
  object_class->get_arg = gtk_label_get_arg;
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  object_class->finalize = gtk_label_finalize;
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  widget_class->size_request = gtk_label_size_request;
  widget_class->expose_event = gtk_label_expose;
}

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static void
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gtk_label_set_arg (GtkObject	  *object,
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		   GtkArg	  *arg,
		   guint	   arg_id)
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{
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  GtkLabel *label;

  label = GTK_LABEL (object);

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  switch (arg_id)
    {
    case ARG_LABEL:
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      gtk_label_set_text (label, GTK_VALUE_STRING (*arg) ? GTK_VALUE_STRING (*arg) : "");
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      break;
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    case ARG_PATTERN:
      gtk_label_set_pattern (label, GTK_VALUE_STRING (*arg));
      break;
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    case ARG_JUSTIFY:
      gtk_label_set_justify (label, GTK_VALUE_ENUM (*arg));
      break;
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    default:
      break;
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    }
}

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static void
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gtk_label_get_arg (GtkObject	  *object,
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		   GtkArg	  *arg,
		   guint	   arg_id)
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{
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  GtkLabel *label;

  label = GTK_LABEL (object);

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  switch (arg_id)
    {
    case ARG_LABEL:
      GTK_VALUE_STRING (*arg) = g_strdup (label->label);
      break;
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    case ARG_PATTERN:
      GTK_VALUE_STRING (*arg) = g_strdup (label->pattern);
      break;
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    case ARG_JUSTIFY:
      GTK_VALUE_ENUM (*arg) = label->jtype;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

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static void
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gtk_label_init (GtkLabel *label)
{
  GTK_WIDGET_SET_FLAGS (label, GTK_NO_WINDOW);
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  label->label = NULL;
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  label->words = NULL;
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  label->max_width = 0;
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  label->jtype = GTK_JUSTIFY_CENTER;
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  label->pattern = NULL;
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  label->wrap = FALSE;

  gtk_label_set_text (label, "");
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}

GtkWidget*
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gtk_label_new (const char *str)
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{
  GtkLabel *label;
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  g_return_val_if_fail (str != NULL, NULL);
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  label = gtk_type_new (gtk_label_get_type ());
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  gtk_label_set_text (label, str);

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  return GTK_WIDGET (label);
}

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static void
gtk_label_set_text_internal (GtkLabel *label,
			     char     *str,
			     GdkWChar *str_wc)
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{
  if (label->label)
    g_free (label->label);
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  if (label->label_wc)
    g_free (label->label_wc);

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  label->label = str;
  label->label_wc = str_wc;
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  gtk_label_free_words (label);
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  if (GTK_WIDGET_VISIBLE (label))
    {
      if (GTK_WIDGET_MAPPED (label))
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	gtk_widget_queue_clear (GTK_WIDGET (label));

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      gtk_widget_queue_resize (GTK_WIDGET (label));
    }
}

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void
gtk_label_set_text (GtkLabel *label,
		    const char *str)
{
  GdkWChar *str_wc;
  gint len;
  gint wc_len;
  
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));
  g_return_if_fail (str != NULL);

  /* Convert text to wide characters */
  len = strlen (str);
  str_wc = g_new (GdkWChar, len + 1);
  wc_len = gdk_mbstowcs (str_wc, str, len + 1);
  str_wc[wc_len] = '\0';

  gtk_label_set_text_internal (label, g_strdup (str), str_wc);
}

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void
gtk_label_set_pattern (GtkLabel	   *label,
		       const gchar *pattern)
{
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));
  
  if (label->pattern)
    g_free (label->pattern);
  label->pattern = g_strdup (pattern);
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  if (GTK_WIDGET_VISIBLE (label))
    {
      if (GTK_WIDGET_MAPPED (label))
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	gtk_widget_queue_clear (GTK_WIDGET (label));
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      gtk_widget_queue_resize (GTK_WIDGET (label));
    }
}

void
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gtk_label_set_justify (GtkLabel *label, GtkJustification jtype)
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{
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));
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  if ((GtkJustification) label->jtype != jtype)
    {
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      if ((label->jtype == GTK_JUSTIFY_FILL) || 
	  (jtype == GTK_JUSTIFY_FILL))
	/* FIXME: think about this a little */
	  gtk_label_free_words (label);
	  
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      label->jtype = jtype;
      
      if (GTK_WIDGET_VISIBLE (label))
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        {
          if (GTK_WIDGET_MAPPED (label))
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	    gtk_widget_queue_clear (GTK_WIDGET (label));
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          gtk_widget_queue_resize (GTK_WIDGET (label));
        }
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    }
}

void
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gtk_label_set_line_wrap (GtkLabel *label, gboolean wrap)
{
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));

  if (label->wrap != wrap) {
    if (GTK_WIDGET_VISIBLE (label))
      {
	if (GTK_WIDGET_MAPPED (label))
	  gtk_widget_queue_clear (GTK_WIDGET (label));
	
	gtk_widget_queue_resize (GTK_WIDGET (label));
      }
    label->wrap = wrap;
  }
}

void
gtk_label_get (GtkLabel  *label,
	       char     **str)
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{
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));
  g_return_if_fail (str != NULL);
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  *str = label->label;
}

static void
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gtk_label_finalize (GtkObject *object)
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{
  GtkLabel *label;
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  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_LABEL (object));
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  label = GTK_LABEL (object);
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  g_free (label->label);
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  if (label->pattern) 
    g_free (label->pattern);
  gtk_label_free_words (label);
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  (* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
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}

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static GtkLabelWord*
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gtk_label_word_alloc ()
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{
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  GtkLabelWord * word;
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  if (!word_chunk)
    {
      word_chunk = g_mem_chunk_new ("GtkLabelWord chunk",
				    sizeof (GtkLabelWord),
				    32 * sizeof (GtkLabelWord),
				    G_ALLOC_ONLY);
    }
  
  if (free_words)
    {
      word = free_words;
      free_words = word->next;
    }
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  else
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    {
      word = g_mem_chunk_alloc (word_chunk);
    }
    
  word->next = 0;
  word->uline = 0;
  return word;
}
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static void
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gtk_label_free_words (GtkLabel *label)
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{
  GtkLabelWord * last;

  if (label->words)
    {
      for (last = label->words; last->next != 0; last = last->next)
	gtk_label_free_ulines (label->words);
      last->next = free_words;
      free_words = label->words;
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      label->words = NULL;
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    }
}
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static GtkLabelULine*
gtk_label_uline_alloc (void)
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{
  GtkLabelULine * uline;

  if (!uline_chunk)
    {
      uline_chunk = g_mem_chunk_new ("GtkLabelWord chunk",
				     sizeof (GtkLabelULine),
				     32 * sizeof (GtkLabelULine),
				     G_ALLOC_ONLY);
    }
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  if (free_ulines)
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    {
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      uline = free_ulines;
      free_ulines = uline->next;
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    }
  else
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    {
      uline = g_mem_chunk_alloc (uline_chunk);
    }
    
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  uline->next = NULL;

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  return uline;
}

static void
gtk_label_free_ulines (GtkLabelWord *word)
{
  GtkLabelULine *last;
  if (word->uline)
    {
      for (last = word->uline; last->next != 0; last = last->next)
	  ;
      last->next = free_ulines;
      free_ulines = word->uline;
      word->uline = 0;
    }
}
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static gint
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gtk_label_split_text (GtkLabel *label)
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{
  GtkLabelWord *word, **tailp;
  gint space_width, line_width, max_line_width;
  GdkWChar *str, *p;
  
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  g_return_val_if_fail (GTK_WIDGET (label)->style->font != NULL, 0);
  
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  gtk_label_free_words (label);
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  if (label->label == NULL)
    return 0;
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  /* Split text at new-lines. */
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  space_width = gdk_string_width (GTK_WIDGET (label)->style->font, " ");
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  line_width = 0;
  max_line_width = 0;
  tailp = &label->words;
  str = label->label_wc;
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  while (*str)
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    {
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      word = gtk_label_word_alloc ();
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      if (str == label->label_wc || str[-1] == '\n')
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	{
	  /* Paragraph break */
	  word->space = 0;
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	  max_line_width = MAX (line_width, max_line_width);
	  line_width = 0;
	}
      else if (str[0] == ' ')
	{
	  while (str[0] == ' ')
	    {
	      str++;
	      word->space += space_width;
	    }
	}
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      else
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	{
	  /* Regular inter-word space */
	  word->space = space_width;
	}
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      word->beginning = str;
      
      word->length = 0;
      p = word->beginning;
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      while (*p && *p != '\n')
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	{
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	  word->length++;
	  p++;
	}
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      word->width = gdk_text_width_wc (GTK_WIDGET (label)->style->font, str, word->length);
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      str += word->length;
      if (*str)
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	str++;
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      line_width += word->space + word->width;
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      *tailp = word;
      tailp = &word->next;
    }
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  /* Add an empty word to represent an empty line
   */
  if ((str == label->label_wc) || (str[-1] == '\n'))
    {
      word = gtk_label_word_alloc ();

      word->space = 0;
      word->beginning = str;
      word->length = 0;
      word->width = 0;
      
      *tailp = word;
      tailp = &word->next;
    }
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  return MAX (line_width, max_line_width);
}

static gint
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gtk_label_split_text_wrapped (GtkLabel *label)
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{
  /* this needs to handle white space better. */
  GtkLabelWord *word, **tailp;
  gint space_width, line_width, max_line_width;
  GdkWChar *str, *p;
  
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  g_return_val_if_fail (GTK_WIDGET (label)->style->font != NULL, 0);
  
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  gtk_label_free_words (label);
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  if (label->label == NULL)
    return 0;
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  /* Split text at new-lines.  (Or at spaces in the case of paragraphs). */
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  space_width = gdk_string_width (GTK_WIDGET (label)->style->font, " ");
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  line_width = 0;
  max_line_width = 0;
  tailp = &label->words;
  str = label->label_wc;
  while (*str)
    {
      word = gtk_label_word_alloc ();
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      if (str == label->label_wc || str[-1] == '\n')
	{
	  /* Paragraph break */
	  word->space = 0;
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	  max_line_width = MAX (line_width, max_line_width);
	  line_width = 0;
	}
      else if (str[0] == ' ')
	{
	  gint nspaces = 0;
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	  while (str[0] == ' ')
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	    {
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	      nspaces++;
	      str++;
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	    }
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	  if (label->jtype == GTK_JUSTIFY_FILL)
	    word->space = (space_width * 3 + 1) / 2;
	  else
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	    word->space = space_width * nspaces;
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	}
      else
	{
	  /* Regular inter-word space */
	  word->space = space_width;
	}
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      word->beginning = str;
      word->length = 0;
      p = word->beginning;
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      while (*p && !gdk_iswspace (*p))
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	{
	  word->length++;
	  p++;
	}
      word->width = gdk_text_width_wc (GTK_WIDGET (label)->style->font, str, word->length);
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      str += word->length;
      if (*str)
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	str++;
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      line_width += word->space + word->width;
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      *tailp = word;
      tailp = &word->next;
    }
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  return MAX (line_width, max_line_width);
}

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/* gtk_label_pick_width
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 *
 * Split paragraphs, trying to make each line at least min_width,
 * and trying even harder to make each line no longer than max_width.
 *
 * Returns the length of the longest resulting line.
 *
 * (The reason we go to all this effort to pick a paragraph width is to
 * try to avoid the lame look of a short paragraph with a
 * short final line.)
 */
static gint
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gtk_label_pick_width (GtkLabel *label,
		      gint      min_width,
		      gint      max_width)
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{
  GtkLabelWord *word;
  gint width, line_width;
  
  g_return_val_if_fail (label->wrap, min_width);
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  line_width = 0;
  width = 0;
  for (word = label->words; word; word = word->next)
    {
      if (word->space == 0
	  || (line_width
	      && (line_width >= min_width
		  || line_width + word->width + word->space > max_width)))
	{
	  /* New line */
	  width = MAX (width, line_width);
	  line_width = 0;
	}
      line_width += word->space + word->width;
    }
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  return MAX (width, line_width);
}

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/* Here, we finalize the lines.
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 * This is only for non-wrap labels.  Wrapped labels
 * use gtk_label_finalize_wrap instead.
 */
static void
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gtk_label_finalize_lines (GtkLabel *label,
			  gint      line_width)
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{
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  GtkLabelWord *line;
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  gint y, baseline_skip, y_max;
  gint i, j;
  gchar *ptrn;
  
  g_return_if_fail (!label->wrap);
  ptrn = label->pattern;

  y = 0;
  baseline_skip = GTK_WIDGET (label)->style->font->ascent + GTK_WIDGET (label)->style->font->descent + 2;
  
  for (line = label->words; line; line = line->next)
    {
      if (label->jtype == GTK_JUSTIFY_CENTER)
	  line->x = (line_width - line->width) / 2;
      else if (label->jtype == GTK_JUSTIFY_RIGHT)
	  line->x = line_width - line->width;
      else
	  line->x = 0;

      line->y = y + GTK_WIDGET (label)->style->font->ascent + 1;
      y_max = 0;
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      /* now we deal with the underline stuff; */
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      if (ptrn && ptrn[0] != '\0')
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	{
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	  for (i = 0; i < line->length; i++)
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	    {
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	      if (ptrn[i] == '\0')
		break;
	      else if (ptrn[i] == '_')
		{
		  gint descent;
		  gint rbearing;
		  gint lbearing;
		  gint width;
		  gint offset;
		  GtkLabelULine *uline;
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		  for (j = i + 1; j < line->length; j++)
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		    {
		      if (ptrn[j] == '\0')
			break;
		      else if (ptrn[j] == ' ')
			break;
		    }
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		  /* good.  Now we have an underlined segment.
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		   * let's measure it and record it.
		   */
		  offset = gdk_text_width_wc (GTK_WIDGET (label)->style->font,
					      line->beginning,
					      i);
		  gdk_text_extents_wc (GTK_WIDGET (label)->style->font,
				       line->beginning+i,
				       j-i, &lbearing,
				       &rbearing, &width, NULL,
				       &descent);
		  y_max = MAX (descent + 2, y_max);
		  uline = gtk_label_uline_alloc ();
		  uline->x1 = offset + line->x + lbearing - 1;
		  uline->x2 = offset + line->x + rbearing;
		  uline->y = line->y + descent + 2;
		  uline->next = line->uline;
		  line->uline = uline;
		  i = j - 1;
		}
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	    }
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	  if (strlen (ptrn) > line->length)
	    /* the + 1 is for line breaks. */
	    ptrn += line->length + 1;
	  else
	    ptrn = NULL;
	}
      y += (baseline_skip + y_max);
    }
  
  label->max_width = line_width;
  GTK_WIDGET (label)->requisition.width = line_width + 2 * label->misc.xpad;
  GTK_WIDGET (label)->requisition.height = y + 2 * label->misc.ypad;
}

/* this finalizes word-wrapped words */
static void
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gtk_label_finalize_lines_wrap (GtkLabel *label,
			       gint      line_width)
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{
  GtkLabelWord *word, *line, *next_line;
  GtkWidget *widget;
  gchar *ptrn;
  gint x, y, space, extra_width, add_space, baseline_skip;
  
  g_return_if_fail (label->wrap);
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  ptrn = label->pattern;
  y = 0;
  baseline_skip = GTK_WIDGET (label)->style->font->ascent + GTK_WIDGET (label)->style->font->descent + 1;
  
  for (line = label->words; line != 0; line = next_line)
    {
      space = 0;
      extra_width = line_width - line->width;
      
      for (next_line = line->next; next_line; next_line = next_line->next)
	{
	  if (next_line->space == 0)
	      break;		/* New paragraph */
	  if (next_line->space + next_line->width > extra_width)
	      break;
	  extra_width -= next_line->space + next_line->width;
	  space += next_line->space;
	}

      line->x = 0;
      line->y = y + GTK_WIDGET (label)->style->font->ascent + 1;
      x = line->width;
      add_space = 0;
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      for (word = line->next; word != next_line; word = word->next)
	{
	  if (next_line && next_line->space)
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	    {
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	      /* Not last line of paragraph --- fill line if needed */
	      if (label->jtype == GTK_JUSTIFY_FILL) {
		add_space = (extra_width * word->space + space / 2) / space;
		extra_width -= add_space;
		space -= word->space;
	      }
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	    }
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	  word->x = x + word->space + add_space;
	  word->y = line->y;
	  x = word->x + word->width;
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	}
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      y += (baseline_skip);
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    }

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  label->max_width = line_width;
  widget = GTK_WIDGET (label);
  widget->requisition.width = line_width + 2 * label->misc.xpad;
  widget->requisition.height = y + 2 * label->misc.ypad + 1;
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}
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static void
gtk_label_size_request (GtkWidget      *widget,
			GtkRequisition *requisition)
{
  GtkLabel *label;
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  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LABEL (widget));
  g_return_if_fail (requisition != NULL);
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  label = GTK_LABEL (widget);
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  /*
   * There are a number of conditions which will necessitate re-filling
   * our text:
   *
   *     1. text changed.
   *     2. justification changed either from to to GTK_JUSTIFY_FILL.
   *     3. font changed.
   *
   * These have been detected elsewhere, and label->words will be zero,
   * if one of the above has occured.
   *
   * Additionally, though, if GTK_JUSTIFY_FILL, we need to re-fill if:
   *
   *     4. gtk_widget_set_usize has changed the requested width.
   *     5. gtk_misc_set_padding has changed xpad.
   *     6.  maybe others?...
   *
   * Too much of a pain to detect all these case, so always re-fill.  I
   * don't think it's really that slow.
   */

  if (label->wrap)
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    {
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      GtkWidgetAuxInfo *aux_info;
      gint longest_paragraph;
      
      longest_paragraph = gtk_label_split_text_wrapped (label);
      
      aux_info = gtk_object_get_data (GTK_OBJECT (widget), "gtk-aux-info");
      if (aux_info && aux_info->width > 0)
	{
	  label->max_width = MAX(aux_info->width - 2 * label->misc.xpad, 1);
	  gtk_label_split_text_wrapped (label);
	}
      else
	{
	  label->max_width = gdk_string_width (GTK_WIDGET (label)->style->font,
					"This is a good enough length for any line to have.");
	  label->max_width = MIN (label->max_width, (gdk_screen_width () + 1) / 2);
	  label->max_width = MIN (label->max_width, longest_paragraph);
	  if (longest_paragraph > 0)
	    {
	      gint nlines, perfect_width;
	      
	      nlines = (longest_paragraph + label->max_width - 1) / label->max_width;
	      perfect_width = (longest_paragraph + nlines - 1) / nlines;
	      label->max_width = gtk_label_pick_width (label,
						 perfect_width,
						 label->max_width);
	    }
	}
      gtk_label_finalize_lines_wrap (label, label->max_width);
    }
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  else if (label->words == NULL)
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    {
      label->max_width = gtk_label_split_text (label);
      gtk_label_finalize_lines (label, label->max_width);
    }
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  if (requisition != &widget->requisition)
    *requisition = widget->requisition;
}
static void
gtk_label_paint_word (GtkLabel *label,
		      gint x,
		      gint y,
		      GtkLabelWord *word,
		      GdkRectangle *area)
{
  GtkWidget *widget = GTK_WIDGET (label);
  GtkLabelULine *uline;
  gchar *tmp_str;
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  tmp_str = gdk_wcstombs (word->beginning);
  gtk_paint_string (widget->style, widget->window, widget->state,
		    area, widget, "label", 
		    x + word->x,
		    y + word->y,
		    tmp_str);
  g_free (tmp_str);
  
  for (uline = word->uline;uline;uline = uline->next)
    gtk_paint_hline (widget->style, widget->window, 
		     widget->state, area,
		     widget, "label", 
		     x + uline->x1, x +uline->x2, y + uline->y);
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}
static gint
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gtk_label_expose (GtkWidget      *widget,
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		  GdkEventExpose *event)
{
  GtkLabel *label;
  GtkMisc *misc;
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  GtkLabelWord *word;
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  gint x, y;
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  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LABEL (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
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  label = GTK_LABEL (widget);
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  if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget) &&
      label->label && (*label->label != '\0'))
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    {
      misc = GTK_MISC (widget);
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      /*
       * GC Clipping
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       */
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      gdk_gc_set_clip_rectangle (widget->style->white_gc, &event->area);
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      gdk_gc_set_clip_rectangle (widget->style->fg_gc[widget->state], &event->area);
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      x = widget->allocation.x + misc->xpad +
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	(widget->allocation.width - label->max_width) 
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	* misc->xalign + 0.5;
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      y = (widget->allocation.y
	   + (widget->allocation.height
	      - widget->requisition.height) * misc->yalign
	   + misc->ypad + 0.5);
      for (word = label->words; word; word = word->next)
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	{
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	  gchar save = word->beginning[word->length];
	  word->beginning[word->length] = '\0';
	  gtk_label_paint_word (label, x, y, word, &event->area);
	  word->beginning[word->length] = save;
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	}
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      gdk_gc_set_clip_mask (widget->style->white_gc, NULL);
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      gdk_gc_set_clip_mask (widget->style->fg_gc[widget->state], NULL);
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    }
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  return TRUE;
}
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guint      
gtk_label_parse_uline (GtkLabel         *label,
		       const gchar      *string)
{
  guint accel_key = GDK_VoidSymbol;
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  GdkWChar *p, *q, *string_wc;
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  gchar *r;
  gchar *pattern;
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  gint length, wc_length;
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  gboolean underscore;

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  /* Convert text to wide characters */
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  length = strlen (string);
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  string_wc = g_new (GdkWChar, length + 1);
  wc_length = gdk_mbstowcs (string_wc, string, length + 1);
  string_wc[wc_length] = '\0';
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  pattern = g_new (gchar, length+1);

  underscore = FALSE;

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  p = q = string_wc;
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  r = pattern;

  while (*p)
    {
      if (underscore)
	{
	  if (*p == '_')
	    *r++ = ' ';
	  else
	    {
	      *r++ = '_';
	      if (accel_key == GDK_VoidSymbol)
		accel_key = gdk_keyval_to_lower (*p);
	    }

	  *q++ = *p;
	  underscore = FALSE;
	}
      else
	{
	  if (*p == '_')
	    underscore = TRUE;
	  else
	    {
	      *q++ = *p;
	      *r++ = ' ';
	    }
	}
      p++;
    }
  *q = 0;
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  *r = 0;
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  gtk_label_set_text_internal (label, gdk_wcstombs (string_wc), string_wc);
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  gtk_label_set_pattern (label, pattern);
  
  g_free (pattern);

  return accel_key;
}