gtktextlayout.c 83.8 KB
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/* GTK - The GIMP Toolkit
 * gtktextlayout.c - calculate the layout of the text
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 *
 * 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
 * Pango support by Owen Taylor
 *
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 * This file can be used under your choice of two licenses, the LGPL
 * and the original Tk license.
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 *
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 * LGPL:
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 *
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 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Original Tk license:
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 *
 * 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.
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 *
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 * 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.
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 *
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 * 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.
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 *
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 * 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.
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 *
 */
/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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 */

#include "gtksignal.h"
#include "gtktextlayout.h"
#include "gtktextbtree.h"
#include "gtktextiterprivate.h"

#include <stdlib.h>
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#include <string.h>
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static GtkTextLineData    *gtk_text_line_data_new                 (GtkTextLayout     *layout,
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                                                                   GtkTextLine       *line);
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static GtkTextLineData *gtk_text_layout_real_wrap (GtkTextLayout *layout,
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                                                   GtkTextLine *line,
                                                   /* may be NULL */
                                                   GtkTextLineData *line_data);
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static void gtk_text_layout_invalidated     (GtkTextLayout     *layout);

static void gtk_text_layout_real_invalidate     (GtkTextLayout     *layout,
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                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);
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static void gtk_text_layout_invalidate_cache    (GtkTextLayout     *layout,
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                                                 GtkTextLine       *line);
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static void gtk_text_layout_real_free_line_data (GtkTextLayout     *layout,
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                                                 GtkTextLine       *line,
                                                 GtkTextLineData   *line_data);
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static void gtk_text_layout_invalidate_all (GtkTextLayout *layout);

static PangoAttribute *gtk_text_attr_appearance_new (const GtkTextAppearance *appearance);

enum {
  INVALIDATED,
  CHANGED,
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  ALLOCATE_CHILD,
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  LAST_SIGNAL
};

enum {
  ARG_0,
  LAST_ARG
};

static void gtk_text_layout_init (GtkTextLayout *text_layout);
static void gtk_text_layout_class_init (GtkTextLayoutClass *klass);
static void gtk_text_layout_destroy (GtkObject *object);
static void gtk_text_layout_finalize (GObject *object);


static GtkObjectClass *parent_class = NULL;
static guint signals[LAST_SIGNAL] = { 0 };

PangoAttrType gtk_text_attr_appearance_type = 0;

GtkType
gtk_text_layout_get_type (void)
{
  static GtkType our_type = 0;

  if (our_type == 0)
    {
      static const GtkTypeInfo our_info =
      {
        "GtkTextLayout",
        sizeof (GtkTextLayout),
        sizeof (GtkTextLayoutClass),
        (GtkClassInitFunc) gtk_text_layout_class_init,
        (GtkObjectInitFunc) gtk_text_layout_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL
      };

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      our_type = gtk_type_unique (GTK_TYPE_OBJECT, &our_info);
    }
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  return our_type;
}

static void
gtk_text_layout_class_init (GtkTextLayoutClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass);

  parent_class = gtk_type_class (GTK_TYPE_OBJECT);

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  object_class->destroy = gtk_text_layout_destroy;
  gobject_class->finalize = gtk_text_layout_finalize;

  klass->wrap = gtk_text_layout_real_wrap;
  klass->invalidate = gtk_text_layout_real_invalidate;
  klass->free_line_data = gtk_text_layout_real_free_line_data;

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  signals[INVALIDATED] =
    gtk_signal_new ("invalidated",
                    GTK_RUN_LAST,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextLayoutClass, invalidated),
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                    gtk_marshal_VOID__VOID,
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                    GTK_TYPE_NONE,
                    0);

  signals[CHANGED] =
    gtk_signal_new ("changed",
                    GTK_RUN_LAST,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextLayoutClass, changed),
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                    gtk_marshal_VOID__INT_INT_INT,
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                    GTK_TYPE_NONE,
                    3,
                    GTK_TYPE_INT,
                    GTK_TYPE_INT,
                    GTK_TYPE_INT);

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  signals[ALLOCATE_CHILD] =
    gtk_signal_new ("allocate_child",
                    GTK_RUN_LAST,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextLayoutClass, allocate_child),
                    gtk_marshal_VOID__OBJECT_INT_INT,
                    GTK_TYPE_NONE,
                    3,
                    GTK_TYPE_OBJECT,
                    GTK_TYPE_INT,
                    GTK_TYPE_INT);
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}

void
gtk_text_layout_init (GtkTextLayout *text_layout)
{
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  text_layout->cursor_visible = TRUE;
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}

GtkTextLayout*
gtk_text_layout_new (void)
{
  return GTK_TEXT_LAYOUT (gtk_type_new (gtk_text_layout_get_type ()));
}

static void
free_style_cache (GtkTextLayout *text_layout)
{
  if (text_layout->one_style_cache)
    {
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      gtk_text_attributes_unref (text_layout->one_style_cache);
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      text_layout->one_style_cache = NULL;
    }
}

static void
gtk_text_layout_destroy (GtkObject *object)
{
  GtkTextLayout *layout;

  layout = GTK_TEXT_LAYOUT (object);

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  gtk_text_layout_set_buffer (layout, NULL);
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  if (layout->default_style)
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    gtk_text_attributes_unref (layout->default_style);
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  layout->default_style = NULL;

  if (layout->ltr_context)
    {
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      g_object_unref (G_OBJECT (layout->ltr_context));
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      layout->ltr_context = NULL;
    }
  if (layout->rtl_context)
    {
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      g_object_unref (G_OBJECT (layout->rtl_context));
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      layout->rtl_context = NULL;
    }
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  (* parent_class->destroy) (object);
}

static void
gtk_text_layout_finalize (GObject *object)
{
  GtkTextLayout *text_layout;

  text_layout = GTK_TEXT_LAYOUT (object);

  (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}

void
gtk_text_layout_set_buffer (GtkTextLayout *layout,
                            GtkTextBuffer *buffer)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer));
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  if (layout->buffer == buffer)
    return;

  free_style_cache (layout);
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  if (layout->buffer)
    {
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      _gtk_text_btree_remove_view (_gtk_text_buffer_get_btree (layout->buffer),
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                                  layout);
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      gtk_object_unref (GTK_OBJECT (layout->buffer));
      layout->buffer = NULL;
    }

  if (buffer)
    {
      layout->buffer = buffer;

      gtk_object_sink (GTK_OBJECT (buffer));
      gtk_object_ref (GTK_OBJECT (buffer));

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      _gtk_text_btree_add_view (_gtk_text_buffer_get_btree (buffer), layout);
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    }
}

void
gtk_text_layout_default_style_changed (GtkTextLayout *layout)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
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  gtk_text_layout_invalidate_all (layout);
}

void
gtk_text_layout_set_default_style (GtkTextLayout *layout,
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                                   GtkTextAttributes *values)
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{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (values != NULL);

  if (values == layout->default_style)
    return;

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  gtk_text_attributes_ref (values);
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  if (layout->default_style)
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    gtk_text_attributes_unref (layout->default_style);
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  layout->default_style = values;

  gtk_text_layout_default_style_changed (layout);
}

void
gtk_text_layout_set_contexts (GtkTextLayout *layout,
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                              PangoContext  *ltr_context,
                              PangoContext  *rtl_context)
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{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));

  if (layout->ltr_context)
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    g_object_unref (G_OBJECT (ltr_context));
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  layout->ltr_context = ltr_context;
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  g_object_ref (G_OBJECT (ltr_context));
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  if (layout->rtl_context)
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    g_object_unref (G_OBJECT (rtl_context));
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  layout->rtl_context = rtl_context;
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  g_object_ref (G_OBJECT (rtl_context));
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  gtk_text_layout_invalidate_all (layout);
}

void
gtk_text_layout_set_screen_width (GtkTextLayout *layout, gint width)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (width >= 0);
  g_return_if_fail (layout->wrap_loop_count == 0);
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  if (layout->screen_width == width)
    return;
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  layout->screen_width = width;
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  gtk_text_layout_invalidate_all (layout);
}

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/**
 * gtk_text_layout_set_cursor_visible:
 * @layout: a #GtkTextLayout
 * @cursor_visible: If %FALSE, then the insertion cursor will not
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 *   be shown, even if the text is editable.
 *
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 * Sets whether the insertion cursor should be shown. Generally,
 * widgets using #GtkTextLayout will hide the cursor when the
 * widget does not have the input focus.
 **/
void
gtk_text_layout_set_cursor_visible (GtkTextLayout *layout,
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                                    gboolean       cursor_visible)
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{
  cursor_visible = (cursor_visible != FALSE);

  if (layout->cursor_visible != cursor_visible)
    {
      GtkTextIter iter;
      gint y, height;
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      layout->cursor_visible = cursor_visible;

      /* Now queue a redraw on the paragraph containing the cursor
       */
      gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
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                                        gtk_text_buffer_get_mark (layout->buffer, "insert"));
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      gtk_text_layout_get_line_yrange (layout, &iter, &y, &height);
      gtk_text_layout_changed (layout, y, height, height);

      gtk_text_layout_invalidate_cache (layout, gtk_text_iter_get_text_line (&iter));
    }
}

/**
 * gtk_text_layout_get_cursor_visible:
 * @layout: a #GtkTextLayout
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 *
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 * Returns whether the insertion cursor will be shown.
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 *
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 * Return value: if %FALSE, the insertion cursor will not be
    shown, even if the text is editable.
 **/
gboolean
gtk_text_layout_get_cursor_visible (GtkTextLayout *layout)
{
  return layout->cursor_visible;
}

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/**
 * gtk_text_layout_set_preedit_string:
 * @layout: a #PangoLayout
 * @preedit_string: a string to display at the insertion point
 * @preedit_attrs: a #PangoAttrList of attributes that apply to @preedit_string
 * @cursor_pos: position of cursor within preedit string in chars
 * 
 * Set the preedit string and attributes. The preedit string is a
 * string showing text that is currently being edited and not
 * yet committed into the buffer.
 **/
void
gtk_text_layout_set_preedit_string (GtkTextLayout *layout,
				    const gchar   *preedit_string,
				    PangoAttrList *preedit_attrs,
				    gint           cursor_pos)
{
  GtkTextIter iter;
  GtkTextLine *line;
  GtkTextLineData *line_data;

  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (preedit_attrs != NULL || preedit_string == NULL);

  if (layout->preedit_string)
    g_free (layout->preedit_string);

  if (layout->preedit_attrs)
    pango_attr_list_unref (layout->preedit_attrs);

  if (preedit_string)
    {
      layout->preedit_string = g_strdup (preedit_string);
      layout->preedit_len = strlen (layout->preedit_string);
      pango_attr_list_ref (preedit_attrs);
      layout->preedit_attrs = preedit_attrs;

      cursor_pos = CLAMP (cursor_pos, 0, g_utf8_strlen (layout->preedit_string, -1));
      layout->preedit_cursor = g_utf8_offset_to_pointer (layout->preedit_string, cursor_pos) - layout->preedit_string;
    }
  else
    {
      layout->preedit_string = NULL;
      layout->preedit_len = 0;
      layout->preedit_attrs = NULL;
      layout->preedit_cursor = 0;
    }

  /* Now invalidate the paragraph containing the cursor
   */
  gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
				    gtk_text_buffer_get_mark (layout->buffer, "insert"));
  
  line = gtk_text_iter_get_text_line (&iter);
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  line_data = _gtk_text_line_get_data (line, layout);
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  if (line_data)
    {
      gtk_text_layout_invalidate_cache (layout, line);
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      _gtk_text_line_invalidate_wrap (line, line_data);
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      gtk_text_layout_invalidated (layout);
    }
}

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void
gtk_text_layout_get_size (GtkTextLayout *layout,
                          gint *width,
                          gint *height)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
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  if (width)
    *width = layout->width;

  if (height)
    *height = layout->height;
}

static void
gtk_text_layout_invalidated (GtkTextLayout *layout)
{
  gtk_signal_emit (GTK_OBJECT (layout), signals[INVALIDATED]);
}

void
gtk_text_layout_changed (GtkTextLayout *layout,
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                         gint           y,
                         gint           old_height,
                         gint           new_height)
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{
  gtk_signal_emit (GTK_OBJECT (layout), signals[CHANGED], y, old_height, new_height);
}

void
gtk_text_layout_free_line_data (GtkTextLayout     *layout,
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                                GtkTextLine       *line,
                                GtkTextLineData   *line_data)
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{
  (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->free_line_data)
    (layout, line, line_data);
}

void
gtk_text_layout_invalidate (GtkTextLayout *layout,
                            const GtkTextIter *start_index,
                            const GtkTextIter *end_index)
{
  (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->invalidate)
    (layout, start_index, end_index);
}

GtkTextLineData*
gtk_text_layout_wrap (GtkTextLayout *layout,
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                      GtkTextLine  *line,
                      /* may be NULL */
                      GtkTextLineData *line_data)
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{
  return (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->wrap) (layout, line, line_data);
}

GSList*
gtk_text_layout_get_lines (GtkTextLayout *layout,
                           /* [top_y, bottom_y) */
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                           gint top_y,
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                           gint bottom_y,
                           gint *first_line_y)
{
  GtkTextLine *first_btree_line;
  GtkTextLine *last_btree_line;
  GtkTextLine *line;
  GSList *retval;
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  g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
  g_return_val_if_fail (bottom_y > top_y, NULL);

  retval = NULL;
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  first_btree_line =
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    _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
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                                   layout, top_y, first_line_y);
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  if (first_btree_line == NULL)
    {
      g_assert (top_y > 0);
      /* off the bottom */
      return NULL;
    }
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  /* -1 since bottom_y is one past */
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  last_btree_line =
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    _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
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                                   layout, bottom_y - 1, NULL);
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  if (!last_btree_line)
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    last_btree_line =
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      _gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer),
                               _gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1,
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                               NULL);
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  {
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    GtkTextLineData *ld = _gtk_text_line_get_data (last_btree_line, layout);
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    if (ld->height == 0)
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      G_BREAKPOINT ();
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  }
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  g_assert (last_btree_line != NULL);

  line = first_btree_line;
  while (TRUE)
    {
      retval = g_slist_prepend (retval, line);

      if (line == last_btree_line)
        break;
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      line = _gtk_text_line_next (line);
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    }
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  retval = g_slist_reverse (retval);

  return retval;
}

static void
invalidate_cached_style (GtkTextLayout *layout)
{
  free_style_cache (layout);
}

/* These should be called around a loop which wraps a CONTIGUOUS bunch
 * of display lines. If the lines aren't contiguous you can't call
 * these.
 */
void
gtk_text_layout_wrap_loop_start (GtkTextLayout *layout)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (layout->one_style_cache == NULL);
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  layout->wrap_loop_count += 1;
}

void
gtk_text_layout_wrap_loop_end (GtkTextLayout *layout)
{
  g_return_if_fail (layout->wrap_loop_count > 0);
617

618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
  layout->wrap_loop_count -= 1;

  if (layout->wrap_loop_count == 0)
    {
      /* We cache a some stuff if we're iterating over some lines wrapping
       * them. This cleans it up.
       */
      /* Nuke our cached style */
      invalidate_cached_style (layout);
      g_assert (layout->one_style_cache == NULL);
    }
}

static void
gtk_text_layout_invalidate_all (GtkTextLayout *layout)
{
  GtkTextIter start;
  GtkTextIter end;
636

637
638
639
640
641
642
643
644
  if (layout->buffer == NULL)
    return;

  gtk_text_buffer_get_bounds (layout->buffer, &start, &end);

  gtk_text_layout_invalidate (layout, &start, &end);
}

645
646
static void
gtk_text_layout_invalidate_cache (GtkTextLayout *layout,
647
                                  GtkTextLine   *line)
648
649
650
651
652
653
654
655
656
{
  if (layout->one_display_cache && line == layout->one_display_cache->line)
    {
      GtkTextLineDisplay *tmp_display = layout->one_display_cache;
      layout->one_display_cache = NULL;
      gtk_text_layout_free_line_display (layout, tmp_display);
    }
}

657
658
659
660
661
662
663
static void
gtk_text_layout_real_invalidate (GtkTextLayout *layout,
                                 const GtkTextIter *start,
                                 const GtkTextIter *end)
{
  GtkTextLine *line;
  GtkTextLine *last_line;
664

665
666
667
668
669
670
671
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (layout->wrap_loop_count == 0);

#if 0
  gtk_text_view_index_spew (start_index, "invalidate start");
  gtk_text_view_index_spew (end_index, "invalidate end");
#endif
672

673
674
  last_line = gtk_text_iter_get_text_line (end);
  line = gtk_text_iter_get_text_line (start);
675
676
677

  while (TRUE)
    {
678
      GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
679
680

      if (line_data &&
681
682
683
          (line != last_line || !gtk_text_iter_starts_line (end)))
        {
          gtk_text_layout_invalidate_cache (layout, line);
684
          _gtk_text_line_invalidate_wrap (line, line_data);
685
686
        }

687
688
      if (line == last_line)
        break;
689

690
      line = _gtk_text_line_next (line);
691
    }
692

693
694
695
696
697
  gtk_text_layout_invalidated (layout);
}

static void
gtk_text_layout_real_free_line_data (GtkTextLayout     *layout,
698
699
                                     GtkTextLine       *line,
                                     GtkTextLineData   *line_data)
700
701
702
703
704
705
706
{
  if (layout->one_display_cache && line == layout->one_display_cache->line)
    {
      GtkTextLineDisplay *tmp_display = layout->one_display_cache;
      layout->one_display_cache = NULL;
      gtk_text_layout_free_line_display (layout, tmp_display);
    }
707

708
709
710
711
712
713
714
715
  g_free (line_data);
}



/**
 * gtk_text_layout_is_valid:
 * @layout: a #GtkTextLayout
716
 *
717
 * Check if there are any invalid regions in a #GtkTextLayout's buffer
718
 *
719
720
721
722
723
724
725
 * Return value: #TRUE if any invalid regions were found
 **/
gboolean
gtk_text_layout_is_valid (GtkTextLayout *layout)
{
  g_return_val_if_fail (layout != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
726

727
  return _gtk_text_btree_is_valid (_gtk_text_buffer_get_btree (layout->buffer),
728
                                  layout);
729
730
}

731
732
733
static void
update_layout_size (GtkTextLayout *layout)
{
734
  _gtk_text_btree_get_view_size (_gtk_text_buffer_get_btree (layout->buffer),
735
736
737
738
				layout,
				&layout->width, &layout->height);
}

739
740
741
742
743
744
745
746
747
748
749
/**
 * gtk_text_layout_validate_yrange:
 * @layout: a #GtkTextLayout
 * @anchor: iter pointing into a line that will be used as the
 *          coordinate origin
 * @y0: offset from the top of the line pointed to by @anchor at
 *      which to begin validation. (The offset here is in pixels
 *      after validation.)
 * @y1: offset from the top of the line pointed to by @anchor at
 *      which to end validation. (The offset here is in pixels
 *      after validation.)
750
751
 *
 * Ensure that a region of a #GtkTextLayout is valid. The ::changed
752
753
754
755
 * signal will be emitted if any lines are validated.
 **/
void
gtk_text_layout_validate_yrange (GtkTextLayout *layout,
756
757
758
                                 GtkTextIter   *anchor,
                                 gint           y0,
                                 gint           y1)
759
760
761
762
763
764
{
  GtkTextLine *line;
  GtkTextLine *first_line = NULL;
  GtkTextLine *last_line = NULL;
  gint seen;
  gint delta_height = 0;
765
766
767
  gint first_line_y = 0;        /* Quiet GCC */
  gint last_line_y = 0;         /* Quiet GCC */

768
769
  g_return_if_fail (layout != NULL);
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
770

771
772
773
774
  if (y0 > 0)
    y0 = 0;
  if (y1 < 0)
    y1 = 0;
775
  
776
777
  /* Validate backwards from the anchor line to y0
   */
778
  line = gtk_text_iter_get_text_line (anchor);
779
780
781
  seen = 0;
  while (line && seen < -y0)
    {
782
      GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
783
      if (!line_data || !line_data->valid)
784
785
786
        {
          gint old_height = line_data ? line_data->height : 0;

787
          __gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
788
                                        line, layout);
789
          line_data = _gtk_text_line_get_data (line, layout);
790
791

          delta_height += line_data->height - old_height;
792
          
793
794
795
796
797
798
799
800
801
          first_line = line;
          first_line_y = -seen;
          if (!last_line)
            {
              last_line = line;
              last_line_y = -seen + line_data->height;
            }
        }

802
      seen += line_data->height;
803
      line = _gtk_text_line_previous (line);
804
805
806
    }

  /* Validate forwards to y1 */
807
  line = gtk_text_iter_get_text_line (anchor);
808
809
810
  seen = 0;
  while (line && seen < y1)
    {
811
      GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
812
      if (!line_data || !line_data->valid)
813
814
815
        {
          gint old_height = line_data ? line_data->height : 0;

816
          __gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
817
                                        line, layout);
818
          line_data = _gtk_text_line_get_data (line, layout);
819
820

          delta_height += line_data->height - old_height;
821
          
822
823
824
825
826
827
828
829
830
          if (!first_line)
            {
              first_line = line;
              first_line_y = seen;
            }
          last_line = line;
          last_line_y = seen + line_data->height;
        }

831
      seen += line_data->height;
832
      line = _gtk_text_line_next (line);
833
834
    }

835
836
  /* If we found and validated any invalid lines, update size and
   * emit the changed signal
837
838
839
   */
  if (first_line)
    {
840
841
842
843
      gint line_top;

      update_layout_size (layout);

844
      line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
845
					       first_line, layout);
846

847
      gtk_text_layout_changed (layout,
848
849
850
                               line_top,
                               last_line_y - first_line_y - delta_height,
                               last_line_y - first_line_y);
851
852
853
854
855
856
857
858
    }
}

/**
 * gtk_text_layout_validate:
 * @tree: a #GtkTextLayout
 * @max_pixels: the maximum number of pixels to validate. (No more
 *              than one paragraph beyond this limit will be validated)
859
 *
860
861
862
863
864
 * Validate regions of a #GtkTextLayout. The ::changed signal will
 * be emitted for each region validated.
 **/
void
gtk_text_layout_validate (GtkTextLayout *layout,
865
                          gint           max_pixels)
866
867
868
869
870
{
  gint y, old_height, new_height;

  g_return_if_fail (layout != NULL);
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
871

872
  while (max_pixels > 0 &&
873
         _gtk_text_btree_validate (_gtk_text_buffer_get_btree (layout->buffer),
874
                                  layout,  max_pixels,
875
                                  &y, &old_height, &new_height))
876
877
    {
      max_pixels -= new_height;
878
879

      update_layout_size (layout);
880
881
882
883
884
885
      gtk_text_layout_changed (layout, y, old_height, new_height);
    }
}

static GtkTextLineData*
gtk_text_layout_real_wrap (GtkTextLayout   *layout,
886
887
888
                           GtkTextLine     *line,
                           /* may be NULL */
                           GtkTextLineData *line_data)
889
890
{
  GtkTextLineDisplay *display;
891

892
  g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
893

894
895
896
  if (line_data == NULL)
    {
      line_data = gtk_text_line_data_new (layout, line);
897
      _gtk_text_line_add_data (line, line_data);
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
    }

  display = gtk_text_layout_get_line_display (layout, line, TRUE);
  line_data->width = display->width;
  line_data->height = display->height;
  line_data->valid = TRUE;
  gtk_text_layout_free_line_display (layout, display);

  return line_data;
}

/*
 * Layout utility functions
 */

/* If you get the style with get_style () you need to call
   release_style () to free it. */
915
static GtkTextAttributes*
916
get_style (GtkTextLayout *layout,
917
           const GtkTextIter *iter)
918
919
920
{
  GtkTextTag** tags;
  gint tag_count = 0;
921
  GtkTextAttributes *style;
922

923
924
925
926
927
928
  /* If we have the one-style cache, then it means
     that we haven't seen a toggle since we filled in the
     one-style cache.
  */
  if (layout->one_style_cache != NULL)
    {
929
      gtk_text_attributes_ref (layout->one_style_cache);
930
931
932
933
      return layout->one_style_cache;
    }

  g_assert (layout->one_style_cache == NULL);
934

935
  /* Get the tags at this spot */
936
  tags = _gtk_text_btree_get_tags (iter, &tag_count);
937
938
939
940
941
942

  /* No tags, use default style */
  if (tags == NULL || tag_count == 0)
    {
      /* One ref for the return value, one ref for the
         layout->one_style_cache reference */
943
944
      gtk_text_attributes_ref (layout->default_style);
      gtk_text_attributes_ref (layout->default_style);
945
946
947
948
949
950
951
      layout->one_style_cache = layout->default_style;

      if (tags)
        g_free (tags);

      return layout->default_style;
    }
952

953
954
  /* Sort tags in ascending order of priority */
  gtk_text_tag_array_sort (tags, tag_count);
955

956
  style = gtk_text_attributes_new ();
957

958
  gtk_text_attributes_copy (layout->default_style,
959
                            style);
960

961
  gtk_text_attributes_fill_from_tags (style,
962
963
                                      tags,
                                      tag_count);
964
965
966
967
968
969
970

  g_free (tags);

  g_assert (style->refcount == 1);

  /* Leave this style as the last one seen */
  g_assert (layout->one_style_cache == NULL);
971
  gtk_text_attributes_ref (style); /* ref held by layout->one_style_cache */
972
  layout->one_style_cache = style;
973

974
975
976
977
978
979
  /* Returning yet another refcount */
  return style;
}

static void
release_style (GtkTextLayout *layout,
980
               GtkTextAttributes *style)
981
982
983
984
{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->refcount > 0);

985
  gtk_text_attributes_unref (style);
986
987
988
989
990
991
992
993
994
995
}

/*
 * Lines
 */

/* This function tries to optimize the case where a line
   is completely invisible */
static gboolean
totally_invisible_line (GtkTextLayout *layout,
996
997
                        GtkTextLine   *line,
                        GtkTextIter   *iter)
998
999
1000
{
  GtkTextLineSegment *seg;
  int bytes = 0;
1001

1002
  /* If we have a cached style, then we know it does actually apply
1003
     and we can just see if it is invisible. */
1004
  if (layout->one_style_cache &&
1005
      !layout->one_style_cache->invisible)
1006
1007
1008
    return FALSE;
  /* Without the cache, we check if the first char is visible, if so
     we are partially visible.  Note that we have to check this since
1009
     we don't know the current invisible/noninvisible toggle state; this
1010
1011
1012
     function can use the whole btree to get it right. */
  else
    {
1013
      _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
1014
1015
                                       iter, line, 0);

1016
      if (!_gtk_text_btree_char_is_invisible (iter))
1017
        return FALSE;
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
    }

  bytes = 0;
  seg = line->segments;

  while (seg != NULL)
    {
      if (seg->byte_count > 0)
        bytes += seg->byte_count;

      /* Note that these two tests can cause us to bail out
         when we shouldn't, because a higher-priority tag
         may override these settings. However the important
1031
1032
         thing is to only invisible really-invisible lines, rather
         than to invisible all really-invisible lines. */
1033

1034
1035
1036
      else if (seg->type == &gtk_text_toggle_on_type)
        {
          invalidate_cached_style (layout);
1037

1038
          /* Bail out if an elision-unsetting tag begins */
1039
1040
          if (seg->body.toggle.info->tag->invisible_set &&
              !seg->body.toggle.info->tag->values->invisible)
1041
1042
1043
1044
1045
            break;
        }
      else if (seg->type == &gtk_text_toggle_off_type)
        {
          invalidate_cached_style (layout);
1046

1047
          /* Bail out if an elision-setting tag ends */
1048
1049
          if (seg->body.toggle.info->tag->invisible_set &&
              seg->body.toggle.info->tag->values->invisible)
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
            break;
        }

      seg = seg->next;
    }

  if (seg != NULL)       /* didn't reach line end */
    return FALSE;

  return TRUE;
}

static void
set_para_values (GtkTextLayout      *layout,
1064
1065
1066
                 GtkTextAttributes *style,
                 GtkTextLineDisplay *display,
                 gdouble            *align)
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
{
  PangoAlignment pango_align = PANGO_ALIGN_LEFT;
  int layout_width;

  display->direction = style->direction;

  if (display->direction == GTK_TEXT_DIR_LTR)
    display->layout = pango_layout_new (layout->ltr_context);
  else
    display->layout = pango_layout_new (layout->rtl_context);

  switch (style->justify)
    {
    case GTK_JUSTIFY_LEFT:
      pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT;
      break;
    case GTK_JUSTIFY_RIGHT:
      pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
      break;
    case GTK_JUSTIFY_CENTER:
      pango_align = PANGO_ALIGN_CENTER;
      break;
    case GTK_JUSTIFY_FILL:
      g_warning ("FIXME we don't support GTK_JUSTIFY_FILL yet");
      break;
    default:
      g_assert_not_reached ();
      break;
    }

  switch (pango_align)
    {
1099
1100
1101
1102
1103
1104
1105
1106
1107
    case PANGO_ALIGN_LEFT:
      *align = 0.0;
      break;
    case PANGO_ALIGN_RIGHT:
      *align = 1.0;
      break;
    case PANGO_ALIGN_CENTER:
      *align = 0.5;
      break;
1108
1109
1110
    }

  pango_layout_set_alignment (display->layout, pango_align);
1111
1112
  pango_layout_set_spacing (display->layout,
                            style->pixels_inside_wrap * PANGO_SCALE);
1113

1114
1115
  if (style->tabs)
    pango_layout_set_tabs (display->layout, style->tabs);
1116

1117
1118
1119
  display->top_margin = style->pixels_above_lines;
  display->height = style->pixels_above_lines + style->pixels_below_lines;
  display->bottom_margin = style->pixels_below_lines;
1120
  display->left_margin = style->left_margin;
1121
  display->right_margin = style->right_margin;
1122
1123
1124
1125
1126
  
  display->x_offset = display->left_margin;

  pango_layout_set_indent (display->layout,
                           style->indent * PANGO_SCALE);
1127
1128
1129
1130
1131
1132

  switch (style->wrap_mode)
    {
    case GTK_WRAPMODE_CHAR:
      /* FIXME: Handle this; for now, fall-through */
    case GTK_WRAPMODE_WORD:
1133
      layout_width = layout->screen_width - display->left_margin - display->right_margin;
1134
1135
1136
1137
1138
      pango_layout_set_width (display->layout, layout_width * PANGO_SCALE);
      break;
    case GTK_WRAPMODE_NONE:
      break;
    }
1139
1140
  
  display->total_width = MAX (layout->screen_width, layout->width) - display->left_margin - display->right_margin;
1141
1142
1143
1144
1145
1146
}

static PangoAttribute *
gtk_text_attr_appearance_copy (const PangoAttribute *attr)
{
  const GtkTextAttrAppearance *appearance_attr = (const GtkTextAttrAppearance *)attr;
1147

1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
  return gtk_text_attr_appearance_new (&appearance_attr->appearance);
}

static void
gtk_text_attr_appearance_destroy (PangoAttribute *attr)
{
  GtkTextAppearance *appearance = &((GtkTextAttrAppearance *)attr)->appearance;

  if (appearance->bg_stipple)
    gdk_drawable_unref (appearance->bg_stipple);
  if (appearance->fg_stipple)
    gdk_drawable_unref (appearance->fg_stipple);
1160

1161
1162
1163
1164
1165
  g_free (attr);
}

static gboolean
gtk_text_attr_appearance_compare (const PangoAttribute *attr1,
1166
                                  const PangoAttribute *attr2)
1167
1168
1169
1170
1171
{
  const GtkTextAppearance *appearance1 = &((const GtkTextAttrAppearance *)attr1)->appearance;
  const GtkTextAppearance *appearance2 = &((const GtkTextAttrAppearance *)attr2)->appearance;

  return (gdk_color_equal (&appearance1->fg_color, &appearance2->fg_color) &&
1172
1173
1174
1175
1176
1177
1178
          gdk_color_equal (&appearance1->bg_color, &appearance2->bg_color) &&
          appearance1->fg_stipple ==  appearance2->fg_stipple &&
          appearance1->bg_stipple ==  appearance2->bg_stipple &&
          appearance1->underline == appearance2->underline &&
          appearance1->strikethrough == appearance2->strikethrough &&
          appearance1->draw_bg == appearance2->draw_bg);

1179
1180
1181
1182
}

/**
 * gtk_text_attr_appearance_new:
1183
1184
 * @desc:
 *
1185
1186
1187
 * Create a new font description attribute. (This attribute
 * allows setting family, style, weight, variant, stretch,
 * and size simultaneously.)
1188
1189
 *
 * Return value:
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
 **/
static PangoAttribute *
gtk_text_attr_appearance_new (const GtkTextAppearance *appearance)
{
  static PangoAttrClass klass = {
    0,
    gtk_text_attr_appearance_copy,
    gtk_text_attr_appearance_destroy,
    gtk_text_attr_appearance_compare
  };

  GtkTextAttrAppearance *result;

  if (!klass.type)
    klass.type = gtk_text_attr_appearance_type =
      pango_attr_type_register ("GtkTextAttrAppearance");

  result = g_new (GtkTextAttrAppearance, 1);
  result->attr.klass = &klass;

  result->appearance = *appearance;
1211

1212
1213
1214
1215
1216
1217
1218
1219
  if (appearance->bg_stipple)
    gdk_drawable_ref (appearance->bg_stipple);
  if (appearance->fg_stipple)
    gdk_drawable_ref (appearance->fg_stipple);

  return (PangoAttribute *)result;
}

1220
1221
1222
1223
1224
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static void
add_generic_attrs (GtkTextLayout      *layout,
                   GtkTextAppearance  *appearance,
                   gint                byte_count,
                   PangoAttrList      *attrs,
                   gint                start,
                   gboolean            size_only,
                   gboolean            is_text)
{
  PangoAttribute *attr;

  if (appearance->underline != PANGO_UNDERLINE_NONE)
    {
      attr = pango_attr_underline_new (appearance->underline);
      
      attr->start_index = start;
      attr->end_index = start + byte_count;
      
      pango_attr_list_insert (attrs, attr);
    }

  if (appearance->rise != 0)
    {
      attr = pango_attr_rise_new (appearance->rise);
      
      attr->start_index = start;
      attr->end_index = start + byte_count;
      
      pango_attr_list_insert (attrs, attr);
    }
  
  if (!size_only)
    {
      attr = gtk_text_attr_appearance_new (appearance);
      
      attr->start_index = start;
      attr->end_index = start + byte_count;

      ((GtkTextAttrAppearance *)attr)->appearance.is_text = is_text;
      
      pango_attr_list_insert (attrs, attr);
    }
}

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static void
add_text_attrs (GtkTextLayout      *layout,
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                GtkTextAttributes  *style,
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                gint                byte_count,
                PangoAttrList      *attrs,
                gint                start,
                gboolean            size_only)
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{
  PangoAttribute *attr;

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  attr = pango_attr_font_desc_new (&style->font);
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  attr->start_index = start;
  attr->end_index = start + byte_count;

  pango_attr_list_insert (attrs, attr);
}

static void
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add_pixbuf_attrs (GtkTextLayout      *layout,
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                  GtkTextLineDisplay *display,
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                  GtkTextAttributes  *style,
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                  GtkTextLineSegment *seg,
                  PangoAttrList      *attrs,
                  gint                start)
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{
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  PangoAttribute *attr;
  PangoRectangle logical_rect;
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  GtkTextPixbuf *pixbuf = &seg->body.pixbuf;
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  gint width, height;

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  width = gdk_pixbuf_get_width (pixbuf->pixbuf);
  height = gdk_pixbuf_get_height (pixbuf->pixbuf);

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  logical_rect.x = 0;
  logical_rect.y = -height * PANGO_SCALE;
  logical_rect.width = width * PANGO_SCALE;
  logical_rect.height = height * PANGO_SCALE;

  attr = pango_attr_shape_new (&logical_rect, &logical_rect);
  attr->start_index = start;
  attr->end_index = start + seg->byte_count;
  pango_attr_list_insert (attrs, attr);

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  display->shaped_objects =
    g_slist_append (display->shaped_objects, pixbuf->pixbuf);
}

static void
add_child_attrs (GtkTextLayout      *layout,
                 GtkTextLineDisplay *display,
                 GtkTextAttributes  *style,
                 GtkTextLineSegment *seg,
                 PangoAttrList      *attrs,
                 gint                start)
{
  PangoAttribute *attr;
  PangoRectangle logical_rect;
  GtkTextChildAnchor *anchor;
  gint width, height;
  GSList *tmp_list;

  width = 1;
  height = 1;
  
  anchor = seg->body.child.obj;

  tmp_list = seg->body.child.widgets;
  while (tmp_list != NULL)
    {
      GtkWidget *child = tmp_list->data;

      if (_gtk_anchored_child_get_layout (child) == layout)
        {
          /* Found it */
          GtkRequisition req;

          gtk_widget_get_child_requisition (child, &req);
          
          width = req.width;
          height = req.height;

          display->shaped_objects =
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            g_slist_append (display->shaped_objects, child);
          
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          break;
        }
      
      tmp_list = g_slist_next (tmp_list);
    }

  if (tmp_list == NULL)
    {
      /* No widget at this anchor in this display;
       * not an error.
       */

      return;
    }
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  if (layout->preedit_string)
    {
      g_free (layout->preedit_string);
      layout->preedit_string = NULL;
    }

  if (layout->preedit_attrs)
    {
      pango_attr_list_unref (layout->preedit_attrs);
      layout->preedit_attrs = NULL;
    }
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  logical_rect.x = 0;
  logical_rect.y = -height * PANGO_SCALE;
  logical_rect.width = width * PANGO_SCALE;
  logical_rect.height = height * PANGO_SCALE;

  attr = pango_attr_shape_new (&logical_rect, &logical_rect);
  attr->start_index = start;
  attr->end_index = start + seg->byte_count;
  pango_attr_list_insert (attrs, attr);
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}

static void
add_cursor (GtkTextLayout      *layout,
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            GtkTextLineDisplay *display,
            GtkTextLineSegment *seg,
            gint                start)
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{
  PangoRectangle strong_pos, weak_pos;
  GtkTextCursorDisplay *cursor;

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  /* Hide insertion cursor when we have a selection or the layout
   * user has hidden the cursor.
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   */
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  if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
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                                     seg->body.mark.obj) &&