gtk2/gtk/gtktexttag.c

/* gtktexttag.c - text tag object
 *
 * Copyright (c) 1992-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 2000      Red Hat, Inc.
 * Tk -> Gtk port by Havoc Pennington <hp@redhat.com>
 *
 * This software is copyrighted by the Regents of the University of
 * California, Sun Microsystems, Inc., and other parties.  The
 * following terms apply to all files associated with the software
 * unless explicitly disclaimed in individual files.
 *
 * The authors hereby grant permission to use, copy, modify,
 * distribute, and license this software and its documentation for any
 * purpose, provided that existing copyright notices are retained in
 * all copies and that this notice is included verbatim in any
 * distributions. No written agreement, license, or royalty fee is
 * required for any of the authorized uses.  Modifications to this
 * software may be copyrighted by their authors and need not follow
 * the licensing terms described here, provided that the new terms are
 * clearly indicated on the first page of each file where they apply.
 *
 * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
 * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
 * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
 * NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
 * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
 * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * GOVERNMENT USE: If you are acquiring this software on behalf of the
 * U.S. government, the Government shall have only "Restricted Rights"
 * in the software and related documentation as defined in the Federal
 * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2).  If you
 * are acquiring the software on behalf of the Department of Defense,
 * the software shall be classified as "Commercial Computer Software"
 * and the Government shall have only "Restricted Rights" as defined
 * in Clause 252.227-7013 (c) (1) of DFARs.  Notwithstanding the
 * foregoing, the authors grant the U.S. Government and others acting
 * in its behalf permission to use and distribute the software in
 * accordance with the terms specified in this license.
 *
 */

#include "config.h"
#include "gtkmain.h"
#include "gtktexttag.h"
#include "gtktexttypes.h"
#include "gtktexttagtable.h"
#include "gtkintl.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"

#include <stdlib.h>
#include <string.h>

enum {
  EVENT,
  LAST_SIGNAL
};

enum {
  PROP_0,
  /* Construct args */
  PROP_NAME,

  /* Style args */
  PROP_BACKGROUND,
  PROP_FOREGROUND,
  PROP_BACKGROUND_GDK,
  PROP_FOREGROUND_GDK,
  PROP_BACKGROUND_STIPPLE,
  PROP_FOREGROUND_STIPPLE,
  PROP_FONT,
  PROP_FONT_DESC,
  PROP_FAMILY,
  PROP_STYLE,
  PROP_VARIANT,
  PROP_WEIGHT,
  PROP_STRETCH,
  PROP_SIZE,
  PROP_SIZE_POINTS,
  PROP_SCALE,
  PROP_PIXELS_ABOVE_LINES,
  PROP_PIXELS_BELOW_LINES,
  PROP_PIXELS_INSIDE_WRAP,
  PROP_EDITABLE,
  PROP_WRAP_MODE,
  PROP_JUSTIFICATION,
  PROP_DIRECTION,
  PROP_LEFT_MARGIN,
  PROP_INDENT,
  PROP_STRIKETHROUGH,
  PROP_RIGHT_MARGIN,
  PROP_UNDERLINE,
  PROP_RISE,
  PROP_BACKGROUND_FULL_HEIGHT,
  PROP_LANGUAGE,
  PROP_TABS,
  PROP_INVISIBLE,
  PROP_PARAGRAPH_BACKGROUND,
  PROP_PARAGRAPH_BACKGROUND_GDK,

  /* Behavior args */
  PROP_ACCUMULATIVE_MARGIN,
  
  /* Whether-a-style-arg-is-set args */
  PROP_BACKGROUND_SET,
  PROP_FOREGROUND_SET,
  PROP_BACKGROUND_STIPPLE_SET,
  PROP_FOREGROUND_STIPPLE_SET,
  PROP_FAMILY_SET,
  PROP_STYLE_SET,
  PROP_VARIANT_SET,
  PROP_WEIGHT_SET,
  PROP_STRETCH_SET,
  PROP_SIZE_SET,
  PROP_SCALE_SET,
  PROP_PIXELS_ABOVE_LINES_SET,
  PROP_PIXELS_BELOW_LINES_SET,
  PROP_PIXELS_INSIDE_WRAP_SET,
  PROP_EDITABLE_SET,
  PROP_WRAP_MODE_SET,
  PROP_JUSTIFICATION_SET,
  PROP_LEFT_MARGIN_SET,
  PROP_INDENT_SET,
  PROP_STRIKETHROUGH_SET,
  PROP_RIGHT_MARGIN_SET,
  PROP_UNDERLINE_SET,
  PROP_RISE_SET,
  PROP_BACKGROUND_FULL_HEIGHT_SET,
  PROP_LANGUAGE_SET,
  PROP_TABS_SET,
  PROP_INVISIBLE_SET,
  PROP_PARAGRAPH_BACKGROUND_SET,

  LAST_ARG
};
static void gtk_text_tag_finalize     (GObject         *object);
static void gtk_text_tag_set_property (GObject         *object,
                                       guint            prop_id,
                                       const GValue    *value,
                                       GParamSpec      *pspec);
static void gtk_text_tag_get_property (GObject         *object,
                                       guint            prop_id,
                                       GValue          *value,
                                       GParamSpec      *pspec);

static guint signals[LAST_SIGNAL] = { 0 };

G_DEFINE_TYPE (GtkTextTag, gtk_text_tag, G_TYPE_OBJECT)

static void
gtk_text_tag_class_init (GtkTextTagClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->set_property = gtk_text_tag_set_property;
  object_class->get_property = gtk_text_tag_get_property;
  
  object_class->finalize = gtk_text_tag_finalize;

  /* Construct */
  g_object_class_install_property (object_class,
                                   PROP_NAME,
                                   g_param_spec_string ("name",
                                                        P_("Tag name"),
                                                        P_("Name used to refer to the text tag. NULL for anonymous tags"),
                                                        NULL,
                                                        GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));

  /* Style args */

  g_object_class_install_property (object_class,
                                   PROP_BACKGROUND,
                                   g_param_spec_string ("background",
                                                        P_("Background color name"),
                                                        P_("Background color as a string"),
                                                        NULL,
                                                        GTK_PARAM_WRITABLE));

  g_object_class_install_property (object_class,
                                   PROP_BACKGROUND_GDK,
                                   g_param_spec_boxed ("background-gdk",
                                                       P_("Background color"),
                                                       P_("Background color as a (possibly unallocated) GdkColor"),
                                                       GDK_TYPE_COLOR,
                                                       GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_BACKGROUND_FULL_HEIGHT,
                                   g_param_spec_boolean ("background-full-height",
                                                         P_("Background full height"),
                                                         P_("Whether the background color fills the entire line height or only the height of the tagged characters"),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE));

  
  g_object_class_install_property (object_class,
                                   PROP_BACKGROUND_STIPPLE,
                                   g_param_spec_object ("background-stipple",
                                                        P_("Background stipple mask"),
                                                        P_("Bitmap to use as a mask when drawing the text background"),
                                                        GDK_TYPE_PIXMAP,
                                                        GTK_PARAM_READWRITE));  


  g_object_class_install_property (object_class,
                                   PROP_FOREGROUND,
                                   g_param_spec_string ("foreground",
                                                        P_("Foreground color name"),
                                                        P_("Foreground color as a string"),
                                                        NULL,
                                                        GTK_PARAM_WRITABLE));

  g_object_class_install_property (object_class,
                                   PROP_FOREGROUND_GDK,
                                   g_param_spec_boxed ("foreground-gdk",
                                                       P_("Foreground color"),
                                                       P_("Foreground color as a (possibly unallocated) GdkColor"),
                                                       GDK_TYPE_COLOR,
                                                       GTK_PARAM_READWRITE));

  
  g_object_class_install_property (object_class,
                                   PROP_FOREGROUND_STIPPLE,
                                   g_param_spec_object ("foreground-stipple",
                                                        P_("Foreground stipple mask"),
                                                        P_("Bitmap to use as a mask when drawing the text foreground"),
                                                        GDK_TYPE_PIXMAP,
                                                        GTK_PARAM_READWRITE));  
  
  g_object_class_install_property (object_class,
                                   PROP_DIRECTION,
                                   g_param_spec_enum ("direction",
                                                      P_("Text direction"),
                                                      P_("Text direction, e.g. right-to-left or left-to-right"),
                                                      GTK_TYPE_TEXT_DIRECTION,
                                                      GTK_TEXT_DIR_NONE,
                                                      GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_EDITABLE,
                                   g_param_spec_boolean ("editable",
                                                         P_("Editable"),
                                                         P_("Whether the text can be modified by the user"),
                                                         TRUE,
                                                         GTK_PARAM_READWRITE));

  /**
   * GtkTextTag:font:
   *
   * Font description as string, e.g. \"Sans Italic 12\". 
   *
   * Note that the initial value of this property depends on
   * the internals of #PangoFontDescription.
   */
  g_object_class_install_property (object_class,
                                   PROP_FONT,
                                   g_param_spec_string ("font",
                                                        P_("Font"),
                                                        P_("Font description as a string, e.g. \"Sans Italic 12\""),
                                                        NULL,
                                                        GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_FONT_DESC,
                                   g_param_spec_boxed ("font-desc",
                                                       P_("Font"),
                                                       P_("Font description as a PangoFontDescription struct"),
                                                       PANGO_TYPE_FONT_DESCRIPTION,
                                                       GTK_PARAM_READWRITE));
  
  g_object_class_install_property (object_class,
                                   PROP_FAMILY,
                                   g_param_spec_string ("family",
                                                        P_("Font family"),
                                                        P_("Name of the font family, e.g. Sans, Helvetica, Times, Monospace"),
                                                        NULL,
                                                        GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_STYLE,
                                   g_param_spec_enum ("style",
                                                      P_("Font style"),
                                                      P_("Font style as a PangoStyle, e.g. PANGO_STYLE_ITALIC"),
                                                      PANGO_TYPE_STYLE,
                                                      PANGO_STYLE_NORMAL,
                                                      GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_VARIANT,
                                   g_param_spec_enum ("variant",
                                                     P_("Font variant"),
                                                     P_("Font variant as a PangoVariant, e.g. PANGO_VARIANT_SMALL_CAPS"),
                                                      PANGO_TYPE_VARIANT,
                                                      PANGO_VARIANT_NORMAL,
                                                      GTK_PARAM_READWRITE));
  
  g_object_class_install_property (object_class,
                                   PROP_WEIGHT,
                                   g_param_spec_int ("weight",
                                                     P_("Font weight"),
                                                     P_("Font weight as an integer, see predefined values in PangoWeight; for example, PANGO_WEIGHT_BOLD"),
                                                     0,
                                                     G_MAXINT,
                                                     PANGO_WEIGHT_NORMAL,
                                                     GTK_PARAM_READWRITE));
  

  g_object_class_install_property (object_class,
                                   PROP_STRETCH,
                                   g_param_spec_enum ("stretch",
                                                      P_("Font stretch"),
                                                      P_("Font stretch as a PangoStretch, e.g. PANGO_STRETCH_CONDENSED"),
                                                      PANGO_TYPE_STRETCH,
                                                      PANGO_STRETCH_NORMAL,
                                                      GTK_PARAM_READWRITE));
  
  g_object_class_install_property (object_class,
                                   PROP_SIZE,
                                   g_param_spec_int ("size",
                                                     P_("Font size"),
                                                     P_("Font size in Pango units"),
                                                     0,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_SCALE,
                                   g_param_spec_double ("scale",
                                                        P_("Font scale"),
                                                        P_("Font size as a scale factor relative to the default font size. This properly adapts to theme changes etc. so is recommended. Pango predefines some scales such as PANGO_SCALE_X_LARGE"),
                                                        0.0,
                                                        G_MAXDOUBLE,
                                                        1.0,
                                                        GTK_PARAM_READWRITE));
  
  g_object_class_install_property (object_class,
                                   PROP_SIZE_POINTS,
                                   g_param_spec_double ("size-points",
                                                        P_("Font points"),
                                                        P_("Font size in points"),
                                                        0.0,
                                                        G_MAXDOUBLE,
                                                        0.0,
                                                        GTK_PARAM_READWRITE));  

  g_object_class_install_property (object_class,
                                   PROP_JUSTIFICATION,
                                   g_param_spec_enum ("justification",
                                                      P_("Justification"),
                                                      P_("Left, right, or center justification"),
                                                      GTK_TYPE_JUSTIFICATION,
                                                      GTK_JUSTIFY_LEFT,
                                                      GTK_PARAM_READWRITE));

  /**
   * GtkTextTag:language:
   *
   * The language this text is in, as an ISO code. Pango can use this as a 
   * hint when rendering the text. If not set, an appropriate default will be 
   * used.
   *
   * Note that the initial value of this property depends on the current
   * locale, see also gtk_get_default_language().
   */
  g_object_class_install_property (object_class,
                                   PROP_LANGUAGE,
                                   g_param_spec_string ("language",
                                                        P_("Language"),
                                                        P_("The language this text is in, as an ISO code. Pango can use this as a hint when rendering the text. If not set, an appropriate default will be used."),
                                                        NULL,
                                                        GTK_PARAM_READWRITE));  

  g_object_class_install_property (object_class,
                                   PROP_LEFT_MARGIN,
                                   g_param_spec_int ("left-margin",
                                                     P_("Left margin"),
                                                     P_("Width of the left margin in pixels"),
                                                     0,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_RIGHT_MARGIN,
                                   g_param_spec_int ("right-margin",
                                                     P_("Right margin"),
                                                     P_("Width of the right margin in pixels"),
                                                     0,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));

  
  g_object_class_install_property (object_class,
                                   PROP_INDENT,
                                   g_param_spec_int ("indent",
                                                     P_("Indent"),
                                                     P_("Amount to indent the paragraph, in pixels"),
                                                     G_MININT,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));

  
  g_object_class_install_property (object_class,
                                   PROP_RISE,
                                   g_param_spec_int ("rise",
                                                     P_("Rise"),
                                                     P_("Offset of text above the baseline (below the baseline if rise is negative) in Pango units"),
						     G_MININT,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_PIXELS_ABOVE_LINES,
                                   g_param_spec_int ("pixels-above-lines",
                                                     P_("Pixels above lines"),
                                                     P_("Pixels of blank space above paragraphs"),
                                                     0,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));
  
  g_object_class_install_property (object_class,
                                   PROP_PIXELS_BELOW_LINES,
                                   g_param_spec_int ("pixels-below-lines",
                                                     P_("Pixels below lines"),
                                                     P_("Pixels of blank space below paragraphs"),
                                                     0,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_PIXELS_INSIDE_WRAP,
                                   g_param_spec_int ("pixels-inside-wrap",
                                                     P_("Pixels inside wrap"),
                                                     P_("Pixels of blank space between wrapped lines in a paragraph"),
                                                     0,
                                                     G_MAXINT,
                                                     0,
                                                     GTK_PARAM_READWRITE));

  g_object_class_install_property (object_class,
                                   PROP_STRIKETHROUGH,
                                   g_param_spec_boolean ("strikethrough",
                                                         P_("Strikethrough"),
                                                         P_("Whether to strike through the text"),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE));
  
  g_object_class_install_property (object_class,
                                   PROP_UNDERLINE,
                                   g_param_spec_enum ("underline",
                                                      P_("Underline"),
                                                      P_("Style of underline for this text"),
                                                      PANGO_TYPE_UNDERLINE,
                                                      PANGO_UNDERLINE_NONE,
                                                      GTK_PARAM_READWRITE));
  
  g_object_class_install_property (object_class,
                                   PROP_WRAP_MODE,
                                   g_param_spec_enum ("wrap-mode",
                                                     P_("Wrap mode"),
                                                     P_("Whether to wrap lines never, at word boundaries, or at character boundaries"),
                                                      GTK_TYPE_WRAP_MODE,
                                                      GTK_WRAP_NONE,
                                                      GTK_PARAM_READWRITE));
  

  g_object_class_install_property (object_class,
                                   PROP_TABS,
                                   g_param_spec_boxed ("tabs",
                                                       P_("Tabs"),
                                                       P_("Custom tabs for this text"),
                                                       PANGO_TYPE_TAB_ARRAY,
                                                       GTK_PARAM_READWRITE));
  
  /**
   * GtkTextTag:invisible:
   *
   * Whether this text is hidden.
   *
   * Note that there may still be problems with the support for invisible 
   * text, in particular when navigating programmatically inside a buffer
   * containing invisible segments. 
   *
   * Since: 2.8
   */
  g_object_class_install_property (object_class,
                                   PROP_INVISIBLE,
                                   g_param_spec_boolean ("invisible",
                                                         P_("Invisible"),
                                                         P_("Whether this text is hidden."),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE));

  /**
   * GtkTextTag:paragraph-background:
   *
   * The paragraph background color as a string.
   *
   * Since: 2.8
   */
  g_object_class_install_property (object_class,
                                   PROP_PARAGRAPH_BACKGROUND,
                                   g_param_spec_string ("paragraph-background",
                                                        P_("Paragraph background color name"),
                                                        P_("Paragraph background color as a string"),
                                                        NULL,
                                                        GTK_PARAM_WRITABLE));

  /**
   * GtkTextTag:paragraph-background-gdk:
   *
   * The paragraph background color as a as a (possibly unallocated) 
   * #GdkColor.
   *
   * Since: 2.8
   */
  g_object_class_install_property (object_class,
                                   PROP_PARAGRAPH_BACKGROUND_GDK,
                                   g_param_spec_boxed ("paragraph-background-gdk",
                                                       P_("Paragraph background color"),
                                                       P_("Paragraph background color as a (possibly unallocated) GdkColor"),
                                                       GDK_TYPE_COLOR,
                                                       GTK_PARAM_READWRITE));

  /**
   * GtkTextTag:accumulative-margin:
   *
   * Whether the margins accumulate or override each other.
   *
   * When set to %TRUE the margins of this tag are added to the margins 
   * of any other non-accumulative margins present. When set to %FALSE 
   * the margins override one another (the default).
   *
   * Since: 2.12
   */
  g_object_class_install_property (object_class,
                                   PROP_ACCUMULATIVE_MARGIN,
                                   g_param_spec_boolean ("accumulative-margin",
                                                         P_("Margin Accumulates"),
                                                         P_("Whether left and right margins accumulate."),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE));

  /* Style props are set or not */

#define ADD_SET_PROP(propname, propval, nick, blurb) g_object_class_install_property (object_class, propval, g_param_spec_boolean (propname, nick, blurb, FALSE, GTK_PARAM_READWRITE))

  ADD_SET_PROP ("background-set", PROP_BACKGROUND_SET,
                P_("Background set"),
                P_("Whether this tag affects the background color"));
  
  ADD_SET_PROP ("background-full-height-set", PROP_BACKGROUND_FULL_HEIGHT_SET,
                P_("Background full height set"),
                P_("Whether this tag affects background height"));

  ADD_SET_PROP ("background-stipple-set", PROP_BACKGROUND_STIPPLE_SET,
                P_("Background stipple set"),
                P_("Whether this tag affects the background stipple"));  

  ADD_SET_PROP ("foreground-set", PROP_FOREGROUND_SET,
                P_("Foreground set"),
                P_("Whether this tag affects the foreground color"));

  ADD_SET_PROP ("foreground-stipple-set", PROP_FOREGROUND_STIPPLE_SET,
                P_("Foreground stipple set"),
                P_("Whether this tag affects the foreground stipple"));
  
  ADD_SET_PROP ("editable-set", PROP_EDITABLE_SET,
                P_("Editability set"),
                P_("Whether this tag affects text editability"));

  ADD_SET_PROP ("family-set", PROP_FAMILY_SET,
                P_("Font family set"),
                P_("Whether this tag affects the font family"));  

  ADD_SET_PROP ("style-set", PROP_STYLE_SET,
                P_("Font style set"),
                P_("Whether this tag affects the font style"));

  ADD_SET_PROP ("variant-set", PROP_VARIANT_SET,
                P_("Font variant set"),
                P_("Whether this tag affects the font variant"));

  ADD_SET_PROP ("weight-set", PROP_WEIGHT_SET,
                P_("Font weight set"),
                P_("Whether this tag affects the font weight"));

  ADD_SET_PROP ("stretch-set", PROP_STRETCH_SET,
                P_("Font stretch set"),
                P_("Whether this tag affects the font stretch"));

  ADD_SET_PROP ("size-set", PROP_SIZE_SET,
                P_("Font size set"),
                P_("Whether this tag affects the font size"));

  ADD_SET_PROP ("scale-set", PROP_SCALE_SET,
                P_("Font scale set"),
                P_("Whether this tag scales the font size by a factor"));
  
  ADD_SET_PROP ("justification-set", PROP_JUSTIFICATION_SET,
                P_("Justification set"),
                P_("Whether this tag affects paragraph justification"));
  
  ADD_SET_PROP ("language-set", PROP_LANGUAGE_SET,
                P_("Language set"),
                P_("Whether this tag affects the language the text is rendered as"));

  ADD_SET_PROP ("left-margin-set", PROP_LEFT_MARGIN_SET,
                P_("Left margin set"),
                P_("Whether this tag affects the left margin"));

  ADD_SET_PROP ("indent-set", PROP_INDENT_SET,
                P_("Indent set"),
                P_("Whether this tag affects indentation"));

  ADD_SET_PROP ("rise-set", PROP_RISE_SET,
                P_("Rise set"),
                P_("Whether this tag affects the rise"));

  ADD_SET_PROP ("pixels-above-lines-set", PROP_PIXELS_ABOVE_LINES_SET,
                P_("Pixels above lines set"),
                P_("Whether this tag affects the number of pixels above lines"));

  ADD_SET_PROP ("pixels-below-lines-set", PROP_PIXELS_BELOW_LINES_SET,
                P_("Pixels below lines set"),
                P_("Whether this tag affects the number of pixels above lines"));

  ADD_SET_PROP ("pixels-inside-wrap-set", PROP_PIXELS_INSIDE_WRAP_SET,
                P_("Pixels inside wrap set"),
                P_("Whether this tag affects the number of pixels between wrapped lines"));

  ADD_SET_PROP ("strikethrough-set", PROP_STRIKETHROUGH_SET,
                P_("Strikethrough set"),
                P_("Whether this tag affects strikethrough"));
  
  ADD_SET_PROP ("right-margin-set", PROP_RIGHT_MARGIN_SET,
                P_("Right margin set"),
                P_("Whether this tag affects the right margin"));

  ADD_SET_PROP ("underline-set", PROP_UNDERLINE_SET,
                P_("Underline set"),
                P_("Whether this tag affects underlining"));

  ADD_SET_PROP ("wrap-mode-set", PROP_WRAP_MODE_SET,
                P_("Wrap mode set"),
                P_("Whether this tag affects line wrap mode"));

  ADD_SET_PROP ("tabs-set", PROP_TABS_SET,
                P_("Tabs set"),
                P_("Whether this tag affects tabs"));

  ADD_SET_PROP ("invisible-set", PROP_INVISIBLE_SET,
                P_("Invisible set"),
                P_("Whether this tag affects text visibility"));

  ADD_SET_PROP ("paragraph-background-set", PROP_PARAGRAPH_BACKGROUND_SET,
                P_("Paragraph background set"),
                P_("Whether this tag affects the paragraph background color"));

  /**
   * GtkTextTag::event:
   * @tag: the #GtkTextTag on which the signal is emitted
   * @object: the object the event was fired from (typically a #GtkTextView)
   * @event: the event which triggered the signal
   * @iter: a #GtkTextIter pointing at the location the event occured
   *
   * The ::event signal is emitted when an event occurs on a region of the
   * buffer marked with this tag.
   *
   * Returns: %TRUE to stop other handlers from being invoked for the
   * event. %FALSE to propagate the event further.
   */
  signals[EVENT] =
    g_signal_new (I_("event"),
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GtkTextTagClass, event),
                  _gtk_boolean_handled_accumulator, NULL,
                  _gtk_marshal_BOOLEAN__OBJECT_BOXED_BOXED,
                  G_TYPE_BOOLEAN,
                  3,
                  G_TYPE_OBJECT,
                  GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE,
                  GTK_TYPE_TEXT_ITER);
}

static void
gtk_text_tag_init (GtkTextTag *text_tag)
{
  text_tag->values = gtk_text_attributes_new ();
}

/**
 * gtk_text_tag_new:
 * @name: (allow-none): tag name, or %NULL
 * 
 * Creates a #GtkTextTag. Configure the tag using object arguments,
 * i.e. using g_object_set().
 * 
 * Return value: a new #GtkTextTag
 **/
GtkTextTag*
gtk_text_tag_new (const gchar *name)
{
  GtkTextTag *tag;

  tag = g_object_new (GTK_TYPE_TEXT_TAG, "name", name, NULL);

  return tag;
}

static void
gtk_text_tag_finalize (GObject *object)
{
  GtkTextTag *text_tag;

  text_tag = GTK_TEXT_TAG (object);

  g_assert (!text_tag->values->realized);

  if (text_tag->table)
    gtk_text_tag_table_remove (text_tag->table, text_tag);

  g_assert (text_tag->table == NULL);

  gtk_text_attributes_unref (text_tag->values);
  text_tag->values = NULL;
  
  g_free (text_tag->name);
  text_tag->name = NULL;

  G_OBJECT_CLASS (gtk_text_tag_parent_class)->finalize (object);
}

static void
set_bg_color (GtkTextTag *tag, GdkColor *color)
{
  if (color)
    {
      if (!tag->bg_color_set)
        {
          tag->bg_color_set = TRUE;
          g_object_notify (G_OBJECT (tag), "background-set");
        }
      
      tag->values->appearance.bg_color = *color;
    }
  else
    {
      if (tag->bg_color_set)
        {
          tag->bg_color_set = FALSE;
          g_object_notify (G_OBJECT (tag), "background-set");
        }
    }
}

static void
set_fg_color (GtkTextTag *tag, GdkColor *color)
{
  if (color)
    {
      if (!tag->fg_color_set)
        {
          tag->fg_color_set = TRUE;
          g_object_notify (G_OBJECT (tag), "foreground-set");
        }
      tag->values->appearance.fg_color = *color;
    }
  else
    {
      if (tag->fg_color_set)
        {
          tag->fg_color_set = FALSE;
          g_object_notify (G_OBJECT (tag), "foreground-set");
        }
    }
}

static void
set_pg_bg_color (GtkTextTag *tag, GdkColor *color)
{
  if (color)
    {
      if (!tag->pg_bg_color_set)
        {
          tag->pg_bg_color_set = TRUE;
          g_object_notify (G_OBJECT (tag), "paragraph-background-set");
        }
      else
	gdk_color_free (tag->values->pg_bg_color);

      tag->values->pg_bg_color = gdk_color_copy (color);
    }
  else
    {
      if (tag->pg_bg_color_set)
        {
          tag->pg_bg_color_set = FALSE;
          g_object_notify (G_OBJECT (tag), "paragraph-background-set");
	  gdk_color_free (tag->values->pg_bg_color);
        }

      tag->values->pg_bg_color = NULL;
    }
}

static PangoFontMask
get_property_font_set_mask (guint prop_id)
{
  switch (prop_id)
    {
    case PROP_FAMILY_SET:
      return PANGO_FONT_MASK_FAMILY;
    case PROP_STYLE_SET:
      return PANGO_FONT_MASK_STYLE;
    case PROP_VARIANT_SET:
      return PANGO_FONT_MASK_VARIANT;
    case PROP_WEIGHT_SET:
      return PANGO_FONT_MASK_WEIGHT;
    case PROP_STRETCH_SET:
      return PANGO_FONT_MASK_STRETCH;
    case PROP_SIZE_SET:
      return PANGO_FONT_MASK_SIZE;
    }

  return 0;
}

static PangoFontMask
set_font_desc_fields (PangoFontDescription *desc,
		      PangoFontMask         to_set)
{
  PangoFontMask changed_mask = 0;
  
  if (to_set & PANGO_FONT_MASK_FAMILY)
    {
      const char *family = pango_font_description_get_family (desc);
      if (!family)
	{
	  family = "sans";
	  changed_mask |= PANGO_FONT_MASK_FAMILY;
	}

      pango_font_description_set_family (desc, family);
    }
  if (to_set & PANGO_FONT_MASK_STYLE)
    pango_font_description_set_style (desc, pango_font_description_get_style (desc));
  if (to_set & PANGO_FONT_MASK_VARIANT)
    pango_font_description_set_variant (desc, pango_font_description_get_variant (desc));
  if (to_set & PANGO_FONT_MASK_WEIGHT)
    pango_font_description_set_weight (desc, pango_font_description_get_weight (desc));
  if (to_set & PANGO_FONT_MASK_STRETCH)
    pango_font_description_set_stretch (desc, pango_font_description_get_stretch (desc));
  if (to_set & PANGO_FONT_MASK_SIZE)
    {
      gint size = pango_font_description_get_size (desc);
      if (size <= 0)
	{
	  size = 10 * PANGO_SCALE;
	  changed_mask |= PANGO_FONT_MASK_SIZE;
	}
      
      pango_font_description_set_size (desc, size);
    }

  return changed_mask;
}

static void
notify_set_changed (GObject       *object,
		    PangoFontMask  changed_mask)
{
  if (changed_mask & PANGO_FONT_MASK_FAMILY)
    g_object_notify (object, "family-set");
  if (changed_mask & PANGO_FONT_MASK_STYLE)
    g_object_notify (object, "style-set");
  if (changed_mask & PANGO_FONT_MASK_VARIANT)
    g_object_notify (object, "variant-set");
  if (changed_mask & PANGO_FONT_MASK_WEIGHT)
    g_object_notify (object, "weight-set");
  if (changed_mask & PANGO_FONT_MASK_STRETCH)
    g_object_notify (object, "stretch-set");
  if (changed_mask & PANGO_FONT_MASK_SIZE)
    g_object_notify (object, "size-set");
}

static void
notify_fields_changed (GObject       *object,
		       PangoFontMask  changed_mask)
{
  if (changed_mask & PANGO_FONT_MASK_FAMILY)
    g_object_notify (object, "family");
  if (changed_mask & PANGO_FONT_MASK_STYLE)
    g_object_notify (object, "style");
  if (changed_mask & PANGO_FONT_MASK_VARIANT)
    g_object_notify (object, "variant");
  if (changed_mask & PANGO_FONT_MASK_WEIGHT)
    g_object_notify (object, "weight");
  if (changed_mask & PANGO_FONT_MASK_STRETCH)
    g_object_notify (object, "stretch");
  if (changed_mask & PANGO_FONT_MASK_SIZE)
    g_object_notify (object, "size");
}

static void
set_font_description (GtkTextTag           *text_tag,
                      PangoFontDescription *font_desc)
{
  GObject *object = G_OBJECT (text_tag);
  PangoFontDescription *new_font_desc;
  PangoFontMask old_mask, new_mask, changed_mask, set_changed_mask;
  
  if (font_desc)
    new_font_desc = pango_font_description_copy (font_desc);
  else
    new_font_desc = pango_font_description_new ();

  if (text_tag->values->font)
    old_mask = pango_font_description_get_set_fields (text_tag->values->font);
  else
    old_mask = 0;
  
  new_mask = pango_font_description_get_set_fields (new_font_desc);

  changed_mask = old_mask | new_mask;
  set_changed_mask = old_mask ^ new_mask;

  if (text_tag->values->font)
    pango_font_description_free (text_tag->values->font);
  text_tag->values->font = new_font_desc;
  
  g_object_freeze_notify (object);

  g_object_notify (object, "font-desc");
  g_object_notify (object, "font");
  
  if (changed_mask & PANGO_FONT_MASK_FAMILY)
    g_object_notify (object, "family");
  if (changed_mask & PANGO_FONT_MASK_STYLE)
    g_object_notify (object, "style");
  if (changed_mask & PANGO_FONT_MASK_VARIANT)
    g_object_notify (object, "variant");
  if (changed_mask & PANGO_FONT_MASK_WEIGHT)
    g_object_notify (object, "weight");
  if (changed_mask & PANGO_FONT_MASK_STRETCH)
    g_object_notify (object, "stretch");
  if (changed_mask & PANGO_FONT_MASK_SIZE)
    {
      g_object_notify (object, "size");
      g_object_notify (object, "size-points");
    }

  notify_set_changed (object, set_changed_mask);
  
  g_object_thaw_notify (object);
}

static void
gtk_text_tag_ensure_font (GtkTextTag *text_tag)
{
  if (!text_tag->values->font)
    text_tag->values->font = pango_font_description_new ();
}

static void
gtk_text_tag_set_property (GObject      *object,
                           guint         prop_id,
                           const GValue *value,
                           GParamSpec   *pspec)
{
  GtkTextTag *text_tag;
  gboolean size_changed = FALSE;

  text_tag = GTK_TEXT_TAG (object);

  g_return_if_fail (!text_tag->values->realized);

  switch (prop_id)
    {
    case PROP_NAME:
      g_return_if_fail (text_tag->name == NULL);
      text_tag->name = g_value_dup_string (value);
      break;

    case PROP_BACKGROUND:
      {
        GdkColor color;

        if (!g_value_get_string (value))
          set_bg_color (text_tag, NULL);       /* reset to background_set to FALSE */
        else if (gdk_color_parse (g_value_get_string (value), &color))
          set_bg_color (text_tag, &color);
        else
          g_warning ("Don't know color `%s'", g_value_get_string (value));

        g_object_notify (object, "background-gdk");
      }
      break;

    case PROP_FOREGROUND:
      {
        GdkColor color;

        if (!g_value_get_string (value))
          set_fg_color (text_tag, NULL);       /* reset to foreground_set to FALSE */
        else if (gdk_color_parse (g_value_get_string (value), &color))
          set_fg_color (text_tag, &color);
        else
          g_warning ("Don't know color `%s'", g_value_get_string (value));

        g_object_notify (object, "foreground-gdk");
      }
      break;

    case PROP_BACKGROUND_GDK:
      {
        GdkColor *color = g_value_get_boxed (value);

        set_bg_color (text_tag, color);
      }
      break;

    case PROP_FOREGROUND_GDK:
      {
        GdkColor *color = g_value_get_boxed (value);

        set_fg_color (text_tag, color);
      }
      break;

    case PROP_BACKGROUND_STIPPLE:
      {
        GdkBitmap *bitmap = g_value_get_object (value);

        text_tag->bg_stipple_set = TRUE;
        g_object_notify (object, "background-stipple-set");
        
        if (text_tag->values->appearance.bg_stipple != bitmap)
          {
            if (bitmap != NULL)
              g_object_ref (bitmap);

            if (text_tag->values->appearance.bg_stipple)
              g_object_unref (text_tag->values->appearance.bg_stipple);

            text_tag->values->appearance.bg_stipple = bitmap;
          }
      }
      break;

    case PROP_FOREGROUND_STIPPLE:
      {
        GdkBitmap *bitmap = g_value_get_object (value);

        text_tag->fg_stipple_set = TRUE;
        g_object_notify (object, "foreground-stipple-set");

        if (text_tag->values->appearance.fg_stipple != bitmap)
          {
            if (bitmap != NULL)
              g_object_ref (bitmap);

            if (text_tag->values->appearance.fg_stipple)
              g_object_unref (text_tag->values->appearance.fg_stipple);

            text_tag->values->appearance.fg_stipple = bitmap;
          }
      }
      break;

    case PROP_FONT:
      {
        PangoFontDescription *font_desc = NULL;
        const gchar *name;

        name = g_value_get_string (value);

        if (name)
          font_desc = pango_font_description_from_string (name);

        set_font_description (text_tag, font_desc);
	if (font_desc)
	  pango_font_description_free (font_desc);
        
        size_changed = TRUE;
      }
      break;

    case PROP_FONT_DESC:
      {
        PangoFontDescription *font_desc;

        font_desc = g_value_get_boxed (value);

        set_font_description (text_tag, font_desc);

        size_changed = TRUE;
      }
      break;

    case PROP_FAMILY:
    case PROP_STYLE:
    case PROP_VARIANT:
    case PROP_WEIGHT:
    case PROP_STRETCH:
    case PROP_SIZE:
    case PROP_SIZE_POINTS:
      {
	PangoFontMask old_set_mask;

	gtk_text_tag_ensure_font (text_tag);
	old_set_mask = pango_font_description_get_set_fields (text_tag->values->font);
 
	switch (prop_id)
	  {
	  case PROP_FAMILY:
	    pango_font_description_set_family (text_tag->values->font,
					       g_value_get_string (value));
	    break;
	  case PROP_STYLE:
	    pango_font_description_set_style (text_tag->values->font,
					      g_value_get_enum (value));
	    break;
	  case PROP_VARIANT:
	    pango_font_description_set_variant (text_tag->values->font,
						g_value_get_enum (value));
	    break;
	  case PROP_WEIGHT:
	    pango_font_description_set_weight (text_tag->values->font,
					       g_value_get_int (value));
	    break;
	  case PROP_STRETCH:
	    pango_font_description_set_stretch (text_tag->values->font,
						g_value_get_enum (value));
	    break;
	  case PROP_SIZE:
	    pango_font_description_set_size (text_tag->values->font,
					     g_value_get_int (value));
	    g_object_notify (object, "size-points");
	    break;
	  case PROP_SIZE_POINTS:
	    pango_font_description_set_size (text_tag->values->font,
					     g_value_get_double (value) * PANGO_SCALE);
	    g_object_notify (object, "size");
	    break;
	  }

	size_changed = TRUE;
	notify_set_changed (object, old_set_mask & pango_font_description_get_set_fields (text_tag->values->font));
	g_object_notify (object, "font-desc");
	g_object_notify (object, "font");

	break;
      }
      
    case PROP_SCALE:
      text_tag->values->font_scale = g_value_get_double (value);
      text_tag->scale_set = TRUE;
      g_object_notify (object, "scale-set");
      size_changed = TRUE;
      break;
      
    case PROP_PIXELS_ABOVE_LINES:
      text_tag->pixels_above_lines_set = TRUE;
      text_tag->values->pixels_above_lines = g_value_get_int (value);
      g_object_notify (object, "pixels-above-lines-set");
      size_changed = TRUE;
      break;

    case PROP_PIXELS_BELOW_LINES:
      text_tag->pixels_below_lines_set = TRUE;
      text_tag->values->pixels_below_lines = g_value_get_int (value);
      g_object_notify (object, "pixels-below-lines-set");
      size_changed = TRUE;
      break;

    case PROP_PIXELS_INSIDE_WRAP:
      text_tag->pixels_inside_wrap_set = TRUE;
      text_tag->values->pixels_inside_wrap = g_value_get_int (value);
      g_object_notify (object, "pixels-inside-wrap-set");
      size_changed = TRUE;
      break;

    case PROP_EDITABLE:
      text_tag->editable_set = TRUE;
      text_tag->values->editable = g_value_get_boolean (value);
      g_object_notify (object, "editable-set");
      break;

    case PROP_WRAP_MODE:
      text_tag->wrap_mode_set = TRUE;
      text_tag->values->wrap_mode = g_value_get_enum (value);
      g_object_notify (object, "wrap-mode-set");
      size_changed = TRUE;
      break;

    case PROP_JUSTIFICATION:
      text_tag->justification_set = TRUE;
      text_tag->values->justification = g_value_get_enum (value);
      g_object_notify (object, "justification-set");
      size_changed = TRUE;
      break;

    case PROP_DIRECTION:
      text_tag->values->direction = g_value_get_enum (value);
      break;

    case PROP_LEFT_MARGIN:
      text_tag->left_margin_set = TRUE;
      text_tag->values->left_margin = g_value_get_int (value);
      g_object_notify (object, "left-margin-set");
      size_changed = TRUE;
      break;

    case PROP_INDENT:
      text_tag->indent_set = TRUE;
      text_tag->values->indent = g_value_get_int (value);
      g_object_notify (object, "indent-set");
      size_changed = TRUE;
      break;

    case PROP_STRIKETHROUGH:
      text_tag->strikethrough_set = TRUE;
      text_tag->values->appearance.strikethrough = g_value_get_boolean (value);
      g_object_notify (object, "strikethrough-set");
      break;

    case PROP_RIGHT_MARGIN:
      text_tag->right_margin_set = TRUE;
      text_tag->values->right_margin = g_value_get_int (value);
      g_object_notify (object, "right-margin-set");
      size_changed = TRUE;
      break;

    case PROP_UNDERLINE:
      text_tag->underline_set = TRUE;
      text_tag->values->appearance.underline = g_value_get_enum (value);
      g_object_notify (object, "underline-set");
      break;

    case PROP_RISE:
      text_tag->rise_set = TRUE;
      text_tag->values->appearance.rise = g_value_get_int (value);
      g_object_notify (object, "rise-set");
      size_changed = TRUE;      
      break;

    case PROP_BACKGROUND_FULL_HEIGHT:
      text_tag->bg_full_height_set = TRUE;
      text_tag->values->bg_full_height = g_value_get_boolean (value);
      g_object_notify (object, "background-full-height-set");
      break;

    case PROP_LANGUAGE:
      text_tag->language_set = TRUE;
      text_tag->values->language = pango_language_from_string (g_value_get_string (value));
      g_object_notify (object, "language-set");
      break;

    case PROP_TABS:
      text_tag->tabs_set = TRUE;

      if (text_tag->values->tabs)
        pango_tab_array_free (text_tag->values->tabs);

      /* FIXME I'm not sure if this is a memleak or not */
      text_tag->values->tabs =
        pango_tab_array_copy (g_value_get_boxed (value));

      g_object_notify (object, "tabs-set");
      
      size_changed = TRUE;
      break;

    case PROP_INVISIBLE:
      text_tag->invisible_set = TRUE;
      text_tag->values->invisible = g_value_get_boolean (value);
      g_object_notify (object, "invisible-set");
      size_changed = TRUE;
      break;
      
    case PROP_PARAGRAPH_BACKGROUND:
      {
        GdkColor color;

        if (!g_value_get_string (value))
          set_pg_bg_color (text_tag, NULL);       /* reset to paragraph_background_set to FALSE */
        else if (gdk_color_parse (g_value_get_string (value), &color))
          set_pg_bg_color (text_tag, &color);
        else
          g_warning ("Don't know color `%s'", g_value_get_string (value));

        g_object_notify (object, "paragraph-background-gdk");
      }
      break;

    case PROP_PARAGRAPH_BACKGROUND_GDK:
      {
        GdkColor *color = g_value_get_boxed (value);

        set_pg_bg_color (text_tag, color);
      }
      break;

    case PROP_ACCUMULATIVE_MARGIN:
      text_tag->accumulative_margin = g_value_get_boolean (value);
      g_object_notify (object, "accumulative-margin");
      size_changed = TRUE;
      break;

      /* Whether the value should be used... */

    case PROP_BACKGROUND_SET:
      text_tag->bg_color_set = g_value_get_boolean (value);
      break;

    case PROP_FOREGROUND_SET:
      text_tag->fg_color_set = g_value_get_boolean (value);
      break;

    case PROP_BACKGROUND_STIPPLE_SET:
      text_tag->bg_stipple_set = g_value_get_boolean (value);
      if (!text_tag->bg_stipple_set &&
          text_tag->values->appearance.bg_stipple)
        {
          g_object_unref (text_tag->values->appearance.bg_stipple);
          text_tag->values->appearance.bg_stipple = NULL;
        }
      break;

    case PROP_FOREGROUND_STIPPLE_SET:
      text_tag->fg_stipple_set = g_value_get_boolean (value);
      if (!text_tag->fg_stipple_set &&
          text_tag->values->appearance.fg_stipple)
        {
          g_object_unref (text_tag->values->appearance.fg_stipple);
          text_tag->values->appearance.fg_stipple = NULL;
        }
      break;

    case PROP_FAMILY_SET:
    case PROP_STYLE_SET:
    case PROP_VARIANT_SET:
    case PROP_WEIGHT_SET:
    case PROP_STRETCH_SET:
    case PROP_SIZE_SET:
      if (!g_value_get_boolean (value))
	{
	  if (text_tag->values->font)
	    pango_font_description_unset_fields (text_tag->values->font,
						 get_property_font_set_mask (prop_id));
	}
      else
	{
	  PangoFontMask changed_mask;
	  
	  gtk_text_tag_ensure_font (text_tag);
	  changed_mask = set_font_desc_fields (text_tag->values->font,
					       get_property_font_set_mask (prop_id));
	  notify_fields_changed (G_OBJECT (text_tag), changed_mask);
	}
      break;

    case PROP_SCALE_SET:
      text_tag->scale_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;
      
    case PROP_PIXELS_ABOVE_LINES_SET:
      text_tag->pixels_above_lines_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_PIXELS_BELOW_LINES_SET:
      text_tag->pixels_below_lines_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_PIXELS_INSIDE_WRAP_SET:
      text_tag->pixels_inside_wrap_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_EDITABLE_SET:
      text_tag->editable_set = g_value_get_boolean (value);
      break;

    case PROP_WRAP_MODE_SET:
      text_tag->wrap_mode_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_JUSTIFICATION_SET:
      text_tag->justification_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;
      
    case PROP_LEFT_MARGIN_SET:
      text_tag->left_margin_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_INDENT_SET:
      text_tag->indent_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_STRIKETHROUGH_SET:
      text_tag->strikethrough_set = g_value_get_boolean (value);
      break;

    case PROP_RIGHT_MARGIN_SET:
      text_tag->right_margin_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_UNDERLINE_SET:
      text_tag->underline_set = g_value_get_boolean (value);
      break;

    case PROP_RISE_SET:
      text_tag->rise_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_BACKGROUND_FULL_HEIGHT_SET:
      text_tag->bg_full_height_set = g_value_get_boolean (value);
      break;

    case PROP_LANGUAGE_SET:
      text_tag->language_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_TABS_SET:
      text_tag->tabs_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;

    case PROP_INVISIBLE_SET:
      text_tag->invisible_set = g_value_get_boolean (value);
      size_changed = TRUE;
      break;
      
    case PROP_PARAGRAPH_BACKGROUND_SET:
      text_tag->pg_bg_color_set = g_value_get_boolean (value);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }

  /* FIXME I would like to do this after all set_property in a single
   * g_object_set () have been called. But an idle function won't
   * work; we need to emit when the tag is changed, not when we get
   * around to the event loop. So blah, we eat some inefficiency.
   */

  /* This is also somewhat weird since we emit another object's
   * signal here, but the two objects are already tightly bound.
   */

  if (text_tag->table)
    g_signal_emit_by_name (text_tag->table,
                           "tag_changed",
                           text_tag, size_changed);
}

static void
gtk_text_tag_get_property (GObject      *object,
                           guint         prop_id,
                           GValue       *value,
                           GParamSpec   *pspec)
{
  GtkTextTag *tag;

  tag = GTK_TEXT_TAG (object);

  switch (prop_id)
    {
    case PROP_NAME:
      g_value_set_string (value, tag->name);
      break;

    case PROP_BACKGROUND_GDK:
      g_value_set_boxed (value, &tag->values->appearance.bg_color);
      break;

    case PROP_FOREGROUND_GDK:
      g_value_set_boxed (value, &tag->values->appearance.fg_color);
      break;

    case PROP_BACKGROUND_STIPPLE:
      if (tag->bg_stipple_set)
        g_value_set_object (value, tag->values->appearance.bg_stipple);
      break;

    case PROP_FOREGROUND_STIPPLE:
      if (tag->fg_stipple_set)
        g_value_set_object (value, tag->values->appearance.fg_stipple);
      break;

    case PROP_FONT:
        {
          gchar *str;

	  gtk_text_tag_ensure_font (tag);
	  
	  str = pango_font_description_to_string (tag->values->font);
          g_value_take_string (value, str);
        }
      break;

    case PROP_FONT_DESC:
      gtk_text_tag_ensure_font (tag);
      g_value_set_boxed (value, tag->values->font);
      break;

    case PROP_FAMILY:
    case PROP_STYLE:
    case PROP_VARIANT:
    case PROP_WEIGHT:
    case PROP_STRETCH:
    case PROP_SIZE:
    case PROP_SIZE_POINTS:
      gtk_text_tag_ensure_font (tag);
      switch (prop_id)
	{
	case PROP_FAMILY:
	  g_value_set_string (value, pango_font_description_get_family (tag->values->font));
	  break;
	  
	case PROP_STYLE:
	  g_value_set_enum (value, pango_font_description_get_style (tag->values->font));
	  break;
	  
	case PROP_VARIANT:
	  g_value_set_enum (value, pango_font_description_get_variant (tag->values->font));
	  break;
	  
	case PROP_WEIGHT:
	  g_value_set_int (value, pango_font_description_get_weight (tag->values->font));
	  break;
	  
	case PROP_STRETCH:
	  g_value_set_enum (value, pango_font_description_get_stretch (tag->values->font));
	  break;
	  
	case PROP_SIZE:
	  g_value_set_int (value, pango_font_description_get_size (tag->values->font));
	  break;
	  
	case PROP_SIZE_POINTS:
	  g_value_set_double (value, ((double)pango_font_description_get_size (tag->values->font)) / (double)PANGO_SCALE);
	  break;
	}
      break;
      
    case PROP_SCALE:
      g_value_set_double (value, tag->values->font_scale);
      break;
      
    case PROP_PIXELS_ABOVE_LINES:
      g_value_set_int (value,  tag->values->pixels_above_lines);
      break;

    case PROP_PIXELS_BELOW_LINES:
      g_value_set_int (value,  tag->values->pixels_below_lines);
      break;

    case PROP_PIXELS_INSIDE_WRAP:
      g_value_set_int (value,  tag->values->pixels_inside_wrap);
      break;

    case PROP_EDITABLE:
      g_value_set_boolean (value, tag->values->editable);
      break;

    case PROP_WRAP_MODE:
      g_value_set_enum (value, tag->values->wrap_mode);
      break;

    case PROP_JUSTIFICATION:
      g_value_set_enum (value, tag->values->justification);
      break;

    case PROP_DIRECTION:
      g_value_set_enum (value, tag->values->direction);
      break;
      
    case PROP_LEFT_MARGIN:
      g_value_set_int (value,  tag->values->left_margin);
      break;

    case PROP_INDENT:
      g_value_set_int (value,  tag->values->indent);
      break;

    case PROP_STRIKETHROUGH:
      g_value_set_boolean (value, tag->values->appearance.strikethrough);
      break;

    case PROP_RIGHT_MARGIN:
      g_value_set_int (value, tag->values->right_margin);
      break;

    case PROP_UNDERLINE:
      g_value_set_enum (value, tag->values->appearance.underline);
      break;

    case PROP_RISE:
      g_value_set_int (value, tag->values->appearance.rise);
      break;

    case PROP_BACKGROUND_FULL_HEIGHT:
      g_value_set_boolean (value, tag->values->bg_full_height);
      break;

    case PROP_LANGUAGE:
      g_value_set_string (value, pango_language_to_string (tag->values->language));
      break;

    case PROP_TABS:
      if (tag->values->tabs)
        g_value_set_boxed (value, tag->values->tabs);
      break;

    case PROP_INVISIBLE:
      g_value_set_boolean (value, tag->values->invisible);
      break;
      
    case PROP_PARAGRAPH_BACKGROUND_GDK:
      g_value_set_boxed (value, tag->values->pg_bg_color);
      break;

    case PROP_ACCUMULATIVE_MARGIN:
      g_value_set_boolean (value, tag->accumulative_margin);
      break;

    case PROP_BACKGROUND_SET:
      g_value_set_boolean (value, tag->bg_color_set);
      break;

    case PROP_FOREGROUND_SET:
      g_value_set_boolean (value, tag->fg_color_set);
      break;

    case PROP_BACKGROUND_STIPPLE_SET:
      g_value_set_boolean (value, tag->bg_stipple_set);
      break;

    case PROP_FOREGROUND_STIPPLE_SET:
      g_value_set_boolean (value, tag->fg_stipple_set);
      break;

    case PROP_FAMILY_SET:
    case PROP_STYLE_SET:
    case PROP_VARIANT_SET:
    case PROP_WEIGHT_SET:
    case PROP_STRETCH_SET:
    case PROP_SIZE_SET:
      {
	PangoFontMask set_mask = tag->values->font ? pango_font_description_get_set_fields (tag->values->font) : 0;
	PangoFontMask test_mask = get_property_font_set_mask (prop_id);
	g_value_set_boolean (value, (set_mask & test_mask) != 0);

	break;
      }

    case PROP_SCALE_SET:
      g_value_set_boolean (value, tag->scale_set);
      break;
      
    case PROP_PIXELS_ABOVE_LINES_SET:
      g_value_set_boolean (value, tag->pixels_above_lines_set);
      break;

    case PROP_PIXELS_BELOW_LINES_SET:
      g_value_set_boolean (value, tag->pixels_below_lines_set);
      break;

    case PROP_PIXELS_INSIDE_WRAP_SET:
      g_value_set_boolean (value, tag->pixels_inside_wrap_set);
      break;

    case PROP_EDITABLE_SET:
      g_value_set_boolean (value, tag->editable_set);
      break;

    case PROP_WRAP_MODE_SET:
      g_value_set_boolean (value, tag->wrap_mode_set);
      break;

    case PROP_JUSTIFICATION_SET:
      g_value_set_boolean (value, tag->justification_set);
      break;
      
    case PROP_LEFT_MARGIN_SET:
      g_value_set_boolean (value, tag->left_margin_set);
      break;

    case PROP_INDENT_SET:
      g_value_set_boolean (value, tag->indent_set);
      break;

    case PROP_STRIKETHROUGH_SET:
      g_value_set_boolean (value, tag->strikethrough_set);
      break;

    case PROP_RIGHT_MARGIN_SET:
      g_value_set_boolean (value, tag->right_margin_set);
      break;

    case PROP_UNDERLINE_SET:
      g_value_set_boolean (value, tag->underline_set);
      break;

    case PROP_RISE_SET:
      g_value_set_boolean (value, tag->rise_set);
      break;

    case PROP_BACKGROUND_FULL_HEIGHT_SET:
      g_value_set_boolean (value, tag->bg_full_height_set);
      break;

    case PROP_LANGUAGE_SET:
      g_value_set_boolean (value, tag->language_set);
      break;

    case PROP_TABS_SET:
      g_value_set_boolean (value, tag->tabs_set);
      break;

    case PROP_INVISIBLE_SET:
      g_value_set_boolean (value, tag->invisible_set);
      break;
      
    case PROP_PARAGRAPH_BACKGROUND_SET:
      g_value_set_boolean (value, tag->pg_bg_color_set);
      break;

    case PROP_BACKGROUND:
    case PROP_FOREGROUND:
    case PROP_PARAGRAPH_BACKGROUND:
      g_warning ("'foreground', 'background' and 'paragraph_background' properties are not readable, use 'foreground_gdk', 'background_gdk' and 'paragraph_background_gdk'");
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

/*
 * Tag operations
 */

typedef struct {
  gint high;
  gint low;
  gint delta;
} DeltaData;

static void
delta_priority_foreach (GtkTextTag *tag, gpointer user_data)
{
  DeltaData *dd = user_data;

  if (tag->priority >= dd->low && tag->priority <= dd->high)
    tag->priority += dd->delta;
}

/**
 * gtk_text_tag_get_priority:
 * @tag: a #GtkTextTag
 * 
 * Get the tag priority.
 * 
 * Return value: The tag's priority.
 **/
gint
gtk_text_tag_get_priority (GtkTextTag *tag)
{
  g_return_val_if_fail (GTK_IS_TEXT_TAG (tag), 0);

  return tag->priority;
}

/**
 * gtk_text_tag_set_priority:
 * @tag: a #GtkTextTag
 * @priority: the new priority
 * 
 * Sets the priority of a #GtkTextTag. Valid priorities are
 * start at 0 and go to one less than gtk_text_tag_table_get_size().
 * Each tag in a table has a unique priority; setting the priority
 * of one tag shifts the priorities of all the other tags in the
 * table to maintain a unique priority for each tag. Higher priority
 * tags "win" if two tags both set the same text attribute. When adding
 * a tag to a tag table, it will be assigned the highest priority in
 * the table by default; so normally the precedence of a set of tags
 * is the order in which they were added to the table, or created with
 * gtk_text_buffer_create_tag(), which adds the tag to the buffer's table
 * automatically.
 **/
void
gtk_text_tag_set_priority (GtkTextTag *tag,
                           gint        priority)
{
  DeltaData dd;

  g_return_if_fail (GTK_IS_TEXT_TAG (tag));
  g_return_if_fail (tag->table != NULL);
  g_return_if_fail (priority >= 0);
  g_return_if_fail (priority < gtk_text_tag_table_get_size (tag->table));

  if (priority == tag->priority)
    return;

  if (priority < tag->priority)
    {
      dd.low = priority;
      dd.high = tag->priority - 1;
      dd.delta = 1;
    }
  else
    {
      dd.low = tag->priority + 1;
      dd.high = priority;
      dd.delta = -1;
    }

  gtk_text_tag_table_foreach (tag->table,
                              delta_priority_foreach,
                              &dd);

  tag->priority = priority;
}

/**
 * gtk_text_tag_event:
 * @tag: a #GtkTextTag
 * @event_object: object that received the event, such as a widget
 * @event: the event
 * @iter: location where the event was received
 * 
 * Emits the "event" signal on the #GtkTextTag.
 * 
 * Return value: result of signal emission (whether the event was handled)
 **/
gboolean
gtk_text_tag_event (GtkTextTag        *tag,
                    GObject           *event_object,
                    GdkEvent          *event,
                    const GtkTextIter *iter)
{
  gboolean retval = FALSE;

  g_return_val_if_fail (GTK_IS_TEXT_TAG (tag), FALSE);
  g_return_val_if_fail (G_IS_OBJECT (event_object), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  g_signal_emit (tag,
                 signals[EVENT],
                 0,
                 event_object,
                 event,
                 iter,
                 &retval);

  return retval;
}

static int
tag_sort_func (gconstpointer first, gconstpointer second)
{
  GtkTextTag *tag1, *tag2;

  tag1 = * (GtkTextTag **) first;
  tag2 = * (GtkTextTag **) second;
  return tag1->priority - tag2->priority;
}

void
_gtk_text_tag_array_sort (GtkTextTag** tag_array_p,
                          guint len)
{
  int i, j, prio;
  GtkTextTag **tag;
  GtkTextTag **maxPtrPtr, *tmp;

  g_return_if_fail (tag_array_p != NULL);
  g_return_if_fail (len > 0);

  if (len < 2) {
    return;
  }
  if (len < 20) {
    GtkTextTag **iter = tag_array_p;

    for (i = len-1; i > 0; i--, iter++) {
      maxPtrPtr = tag = iter;
      prio = tag[0]->priority;
      for (j = i, tag++; j > 0; j--, tag++) {
        if (tag[0]->priority < prio) {
          prio = tag[0]->priority;
          maxPtrPtr = tag;
        }
      }
      tmp = *maxPtrPtr;
      *maxPtrPtr = *iter;
      *iter = tmp;
    }
  } else {
    qsort ((void *) tag_array_p, (unsigned) len, sizeof (GtkTextTag *),
           tag_sort_func);
  }

#if 0
  {
    printf ("Sorted tag array: \n");
    i = 0;
    while (i < len)
      {
        GtkTextTag *t = tag_array_p[i];
        printf ("  %s priority %d\n", t->name, t->priority);

        ++i;
      }
  }
#endif
}

/*
 * Attributes
 */

/**
 * gtk_text_attributes_new:
 * 
 * Creates a #GtkTextAttributes, which describes
 * a set of properties on some text.
 * 
 * Return value: a new #GtkTextAttributes
 **/
GtkTextAttributes*
gtk_text_attributes_new (void)
{
  GtkTextAttributes *values;

  values = g_new0 (GtkTextAttributes, 1);

  /* 0 is a valid value for most of the struct */

  values->refcount = 1;

  values->language = gtk_get_default_language ();

  values->font_scale = 1.0;

  values->editable = TRUE;
      
  return values;
}

/**
 * gtk_text_attributes_copy:
 * @src: a #GtkTextAttributes to be copied
 * 
 * Copies @src and returns a new #GtkTextAttributes.
 * 
 * Return value: a copy of @src
 **/
GtkTextAttributes*
gtk_text_attributes_copy (GtkTextAttributes *src)
{
  GtkTextAttributes *dest;

  dest = gtk_text_attributes_new ();
  gtk_text_attributes_copy_values (src, dest);

  return dest;
}

GType
gtk_text_attributes_get_type (void)
{
  static GType our_type = 0;
  
  if (our_type == 0)
    our_type = g_boxed_type_register_static (I_("GtkTextAttributes"),
					     (GBoxedCopyFunc) gtk_text_attributes_ref,
					     (GBoxedFreeFunc) gtk_text_attributes_unref);

  return our_type;
}

/**
 * gtk_text_attributes_copy_values:
 * @src: a #GtkTextAttributes
 * @dest: another #GtkTextAttributes
 * 
 * Copies the values from @src to @dest so that @dest has the same values
 * as @src. Frees existing values in @dest.
 **/
void
gtk_text_attributes_copy_values (GtkTextAttributes *src,
                                 GtkTextAttributes *dest)
{
  guint orig_refcount;

  g_return_if_fail (!dest->realized);

  if (src == dest)
    return;

  /* Add refs */

  if (src->appearance.bg_stipple)
    g_object_ref (src->appearance.bg_stipple);

  if (src->appearance.fg_stipple)
    g_object_ref (src->appearance.fg_stipple);

  /* Remove refs */

  if (dest->appearance.bg_stipple)
    g_object_unref (dest->appearance.bg_stipple);

  if (dest->appearance.fg_stipple)
    g_object_unref (dest->appearance.fg_stipple);

  if (dest->font)
    pango_font_description_free (dest->font);
  
  /* Copy */
  orig_refcount = dest->refcount;

  *dest = *src;

  if (src->tabs)
    dest->tabs = pango_tab_array_copy (src->tabs);

  dest->language = src->language;

  if (dest->font)
    dest->font = pango_font_description_copy (src->font);
  
  if (src->pg_bg_color)
    dest->pg_bg_color = gdk_color_copy (src->pg_bg_color);

  dest->refcount = orig_refcount;
  dest->realized = FALSE;
}

/**
 * gtk_text_attributes_ref:
 * @values: a #GtkTextAttributes
 * 
 * Increments the reference count on @values.
 *
 * Returns: the #GtkTextAttributes that were passed in
 **/
GtkTextAttributes *
gtk_text_attributes_ref (GtkTextAttributes *values)
{
  g_return_val_if_fail (values != NULL, NULL);

  values->refcount += 1;

  return values;
}

/**
 * gtk_text_attributes_unref:
 * @values: a #GtkTextAttributes
 * 
 * Decrements the reference count on @values, freeing the structure
 * if the reference count reaches 0.
 **/
void
gtk_text_attributes_unref (GtkTextAttributes *values)
{
  g_return_if_fail (values != NULL);
  g_return_if_fail (values->refcount > 0);

  values->refcount -= 1;

  if (values->refcount == 0)
    {
      g_assert (!values->realized);

      if (values->appearance.bg_stipple)
        g_object_unref (values->appearance.bg_stipple);

      if (values->appearance.fg_stipple)
        g_object_unref (values->appearance.fg_stipple);

      if (values->tabs)
        pango_tab_array_free (values->tabs);

      if (values->font)
	pango_font_description_free (values->font);

      if (values->pg_bg_color)
	gdk_color_free (values->pg_bg_color);

      g_free (values);
    }
}

void
_gtk_text_attributes_realize (GtkTextAttributes *values,
                              GdkColormap *cmap,
                              GdkVisual *visual)
{
  g_return_if_fail (values != NULL);
  g_return_if_fail (values->refcount > 0);
  g_return_if_fail (!values->realized);

  /* It is wrong to use this colormap, FIXME */
  gdk_colormap_alloc_color (cmap,
                            &values->appearance.fg_color,
                            FALSE, TRUE);

  gdk_colormap_alloc_color (cmap,
                            &values->appearance.bg_color,
                            FALSE, TRUE);

  if (values->pg_bg_color)
    gdk_colormap_alloc_color (cmap,
			      values->pg_bg_color,
			      FALSE, TRUE);

  values->realized = TRUE;
}

void
_gtk_text_attributes_unrealize (GtkTextAttributes *values,
                                GdkColormap *cmap,
                                GdkVisual *visual)
{
  g_return_if_fail (values != NULL);
  g_return_if_fail (values->refcount > 0);
  g_return_if_fail (values->realized);

  gdk_colormap_free_colors (cmap,
                            &values->appearance.fg_color, 1);


  gdk_colormap_free_colors (cmap,
                            &values->appearance.bg_color, 1);

  values->appearance.fg_color.pixel = 0;
  values->appearance.bg_color.pixel = 0;

  if (values->pg_bg_color)
    {
      gdk_colormap_free_colors (cmap, values->pg_bg_color, 1);
      
      values->pg_bg_color->pixel = 0;
    }

  values->realized = FALSE;
}

void
_gtk_text_attributes_fill_from_tags (GtkTextAttributes *dest,
                                     GtkTextTag**       tags,
                                     guint              n_tags)
{
  guint n = 0;

  guint left_margin_accumulative = 0;
  guint right_margin_accumulative = 0;

  g_return_if_fail (!dest->realized);

  while (n < n_tags)
    {
      GtkTextTag *tag = tags[n];
      GtkTextAttributes *vals = tag->values;

      g_assert (tag->table != NULL);
      if (n > 0)
        g_assert (tags[n]->priority > tags[n-1]->priority);

      if (tag->bg_color_set)
        {
          dest->appearance.bg_color = vals->appearance.bg_color;

          dest->appearance.draw_bg = TRUE;
        }
      if (tag->fg_color_set)
        dest->appearance.fg_color = vals->appearance.fg_color;
      
      if (tag->pg_bg_color_set)
        {
          dest->pg_bg_color = gdk_color_copy (vals->pg_bg_color);
        }

      if (tag->bg_stipple_set)
        {
          g_object_ref (vals->appearance.bg_stipple);
          if (dest->appearance.bg_stipple)
            g_object_unref (dest->appearance.bg_stipple);
          dest->appearance.bg_stipple = vals->appearance.bg_stipple;

          dest->appearance.draw_bg = TRUE;
        }

      if (tag->fg_stipple_set)
        {
          g_object_ref (vals->appearance.fg_stipple);
          if (dest->appearance.fg_stipple)
            g_object_unref (dest->appearance.fg_stipple);
          dest->appearance.fg_stipple = vals->appearance.fg_stipple;
        }

      if (vals->font)
	{
	  if (dest->font)
	    pango_font_description_merge (dest->font, vals->font, TRUE);
	  else
	    dest->font = pango_font_description_copy (vals->font);
	}

      /* multiply all the scales together to get a composite */
      if (tag->scale_set)
        dest->font_scale *= vals->font_scale;
      
      if (tag->justification_set)
        dest->justification = vals->justification;

      if (vals->direction != GTK_TEXT_DIR_NONE)
        dest->direction = vals->direction;

      if (tag->left_margin_set) 
        {
          if (tag->accumulative_margin)
            left_margin_accumulative += vals->left_margin;
          else
            dest->left_margin = vals->left_margin;
        }

      if (tag->indent_set)
        dest->indent = vals->indent;

      if (tag->rise_set)
        dest->appearance.rise = vals->appearance.rise;

      if (tag->right_margin_set) 
        {
          if (tag->accumulative_margin)
            right_margin_accumulative += vals->right_margin;
          else
            dest->right_margin = vals->right_margin;
        }

      if (tag->pixels_above_lines_set)
        dest->pixels_above_lines = vals->pixels_above_lines;

      if (tag->pixels_below_lines_set)
        dest->pixels_below_lines = vals->pixels_below_lines;

      if (tag->pixels_inside_wrap_set)
        dest->pixels_inside_wrap = vals->pixels_inside_wrap;

      if (tag->tabs_set)
        {
          if (dest->tabs)
            pango_tab_array_free (dest->tabs);
          dest->tabs = pango_tab_array_copy (vals->tabs);
        }

      if (tag->wrap_mode_set)
        dest->wrap_mode = vals->wrap_mode;

      if (tag->underline_set)
        dest->appearance.underline = vals->appearance.underline;

      if (tag->strikethrough_set)
        dest->appearance.strikethrough = vals->appearance.strikethrough;

      if (tag->invisible_set)
        dest->invisible = vals->invisible;

      if (tag->editable_set)
        dest->editable = vals->editable;

      if (tag->bg_full_height_set)
        dest->bg_full_height = vals->bg_full_height;

      if (tag->language_set)
	dest->language = vals->language;

      ++n;
    }

  dest->left_margin += left_margin_accumulative;
  dest->right_margin += right_margin_accumulative;
}

gboolean
_gtk_text_tag_affects_size (GtkTextTag *tag)
{
  g_return_val_if_fail (GTK_IS_TEXT_TAG (tag), FALSE);

  return
    (tag->values->font && pango_font_description_get_set_fields (tag->values->font) != 0) ||
    tag->scale_set ||
    tag->justification_set ||
    tag->left_margin_set ||
    tag->indent_set ||
    tag->rise_set ||
    tag->right_margin_set ||
    tag->pixels_above_lines_set ||
    tag->pixels_below_lines_set ||
    tag->pixels_inside_wrap_set ||
    tag->tabs_set ||
    tag->underline_set ||
    tag->wrap_mode_set ||
    tag->invisible_set;
}

gboolean
_gtk_text_tag_affects_nonsize_appearance (GtkTextTag *tag)
{
  g_return_val_if_fail (GTK_IS_TEXT_TAG (tag), FALSE);

  return
    tag->bg_color_set ||
    tag->bg_stipple_set ||
    tag->fg_color_set ||
    tag->fg_stipple_set ||
    tag->strikethrough_set ||
    tag->bg_full_height_set ||
    tag->pg_bg_color_set;
}