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/* gtktextchild.c - child pixmaps and widgets
*
* Copyright (c) 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.
*
*/

#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
#include "config.h"
#include "gtktextchild.h"
#include "gtktextbtree.h"
#include "gtktextlayout.h"
#include "gtkintl.h"

#define CHECK_IN_BUFFER(anchor) \
G_STMT_START { \
if ((anchor)->segment == NULL) \
{ \
g_warning ("%s: GtkTextChildAnchor hasn't been in a buffer yet",\
G_STRFUNC); \
} \
} G_STMT_END

#define CHECK_IN_BUFFER_RETURN(anchor, val) \
G_STMT_START { \
if ((anchor)->segment == NULL) \
{ \
g_warning ("%s: GtkTextChildAnchor hasn't been in a buffer yet",\
G_STRFUNC); \
return (val); \
} \
} G_STMT_END

static GtkTextLineSegment *
pixbuf_segment_cleanup_func (GtkTextLineSegment *seg,
                             GtkTextLine *line)
{
  /* nothing */
  return seg;
}

static int
pixbuf_segment_delete_func (GtkTextLineSegment *seg,
                            GtkTextLine *line,
                            gboolean tree_gone)
{
  if (seg->body.pixbuf.pixbuf)
    g_object_unref (seg->body.pixbuf.pixbuf);

  g_free (seg);

  return 0;
}

static void
pixbuf_segment_check_func (GtkTextLineSegment *seg,
                           GtkTextLine *line)
{
  if (seg->next == NULL)
    g_error ("pixbuf segment is the last segment in a line");

  if (seg->byte_count != 3)
    g_error ("pixbuf segment has byte count of %d", seg->byte_count);

  if (seg->char_count != 1)
    g_error ("pixbuf segment has char count of %d", seg->char_count);
}


const GtkTextLineSegmentClass gtk_text_pixbuf_type = {
  "pixbuf", /* name */
  FALSE, /* leftGravity */
  NULL, /* splitFunc */
  pixbuf_segment_delete_func, /* deleteFunc */
  pixbuf_segment_cleanup_func, /* cleanupFunc */
  NULL, /* lineChangeFunc */
  pixbuf_segment_check_func /* checkFunc */

};

#define PIXBUF_SEG_SIZE ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
+ sizeof (GtkTextPixbuf)))

GtkTextLineSegment *
_gtk_pixbuf_segment_new (GdkPixbuf *pixbuf)
{
  GtkTextLineSegment *seg;

  seg = g_malloc (PIXBUF_SEG_SIZE);

  seg->type = &gtk_text_pixbuf_type;

  seg->next = NULL;

  /* We convert to the 0xFFFC "unknown character",
* a 3-byte sequence in UTF-8.
*/
  seg->byte_count = GTK_TEXT_UNKNOWN_CHAR_UTF8_LEN;
  seg->char_count = 1;

  seg->body.pixbuf.pixbuf = pixbuf;

  g_object_ref (pixbuf);

  return seg;
}


static GtkTextLineSegment *
child_segment_cleanup_func (GtkTextLineSegment *seg,
                            GtkTextLine *line)
{
  seg->body.child.line = line;

  return seg;
}

static int
child_segment_delete_func (GtkTextLineSegment *seg,
                           GtkTextLine *line,
                           gboolean tree_gone)
{
  GSList *tmp_list;
  GSList *copy;

  _gtk_text_btree_unregister_child_anchor (seg->body.child.obj);
  
  seg->body.child.tree = NULL;
  seg->body.child.line = NULL;

  /* avoid removing widgets while walking the list */
  copy = g_slist_copy (seg->body.child.widgets);
  tmp_list = copy;
  while (tmp_list != NULL)
    {
      GtkWidget *child = tmp_list->data;

      gtk_widget_destroy (child);
      
      tmp_list = g_slist_next (tmp_list);
    }

  /* On removal from the widget's parents (GtkTextView),
* the widget should have been removed from the anchor.
*/
  g_assert (seg->body.child.widgets == NULL);

  g_slist_free (copy);
  
  _gtk_widget_segment_unref (seg);
  
  return 0;
}

static void
child_segment_check_func (GtkTextLineSegment *seg,
                          GtkTextLine *line)
{
  if (seg->next == NULL)
    g_error ("child segment is the last segment in a line");

  if (seg->byte_count != 3)
    g_error ("child segment has byte count of %d", seg->byte_count);

  if (seg->char_count != 1)
    g_error ("child segment has char count of %d", seg->char_count);
}

const GtkTextLineSegmentClass gtk_text_child_type = {
  "child-widget", /* name */
  FALSE, /* leftGravity */
  NULL, /* splitFunc */
  child_segment_delete_func, /* deleteFunc */
  child_segment_cleanup_func, /* cleanupFunc */
  NULL, /* lineChangeFunc */
  child_segment_check_func /* checkFunc */
};

#define WIDGET_SEG_SIZE ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
+ sizeof (GtkTextChildBody)))

GtkTextLineSegment *
_gtk_widget_segment_new (GtkTextChildAnchor *anchor)
{
  GtkTextLineSegment *seg;

  seg = g_malloc (WIDGET_SEG_SIZE);

  seg->type = &gtk_text_child_type;

  seg->next = NULL;

  seg->byte_count = 3; /* We convert to the 0xFFFC "unknown character",
* a 3-byte sequence in UTF-8
*/
  seg->char_count = 1;

  seg->body.child.obj = anchor;
  seg->body.child.obj->segment = seg;
  seg->body.child.widgets = NULL;
  seg->body.child.tree = NULL;
  seg->body.child.line = NULL;

  g_object_ref (anchor);
  
  return seg;
}

void
_gtk_widget_segment_add (GtkTextLineSegment *widget_segment,
                            GtkWidget *child)
{
  g_return_if_fail (widget_segment->type == &gtk_text_child_type);
  g_return_if_fail (widget_segment->body.child.tree != NULL);

  g_object_ref (child);
  
  widget_segment->body.child.widgets =
    g_slist_prepend (widget_segment->body.child.widgets,
                     child);
}

void
_gtk_widget_segment_remove (GtkTextLineSegment *widget_segment,
                            GtkWidget *child)
{
  g_return_if_fail (widget_segment->type == &gtk_text_child_type);
  
  widget_segment->body.child.widgets =
    g_slist_remove (widget_segment->body.child.widgets,
                    child);

  g_object_unref (child);
}

void
_gtk_widget_segment_ref (GtkTextLineSegment *widget_segment)
{
  g_assert (widget_segment->type == &gtk_text_child_type);

  g_object_ref (widget_segment->body.child.obj);
}

void
_gtk_widget_segment_unref (GtkTextLineSegment *widget_segment)
{
  g_assert (widget_segment->type == &gtk_text_child_type);

  g_object_unref (widget_segment->body.child.obj);
}

GtkTextLayout*
_gtk_anchored_child_get_layout (GtkWidget *child)
{
  return g_object_get_data (G_OBJECT (child), "gtk-text-child-anchor-layout");
}

static void
_gtk_anchored_child_set_layout (GtkWidget *child,
                                GtkTextLayout *layout)
{
  g_object_set_data (G_OBJECT (child),
                     I_("gtk-text-child-anchor-layout"),
                     layout);
}
     
static void gtk_text_child_anchor_finalize (GObject *obj);

G_DEFINE_TYPE (GtkTextChildAnchor, gtk_text_child_anchor, G_TYPE_OBJECT)

static void
gtk_text_child_anchor_init (GtkTextChildAnchor *child_anchor)
{
  child_anchor->segment = NULL;
}

static void
gtk_text_child_anchor_class_init (GtkTextChildAnchorClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->finalize = gtk_text_child_anchor_finalize;
}

/**
* gtk_text_child_anchor_new:
*
* Creates a new #GtkTextChildAnchor. Usually you would then insert
* it into a #GtkTextBuffer with gtk_text_buffer_insert_child_anchor().
* To perform the creation and insertion in one step, use the
* convenience function gtk_text_buffer_create_child_anchor().
*
* Return value: a new #GtkTextChildAnchor
**/
GtkTextChildAnchor*
gtk_text_child_anchor_new (void)
{
  return g_object_new (GTK_TYPE_TEXT_CHILD_ANCHOR, NULL);
}

static void
gtk_text_child_anchor_finalize (GObject *obj)
{
  GtkTextChildAnchor *anchor;
  GSList *tmp_list;
  GtkTextLineSegment *seg;
  
  anchor = GTK_TEXT_CHILD_ANCHOR (obj);

  seg = anchor->segment;
  
  if (seg)
    {
      if (seg->body.child.tree != NULL)
        {
          g_warning ("Someone removed a reference to a GtkTextChildAnchor "
                     "they didn't own; the anchor is still in the text buffer "
                     "and the refcount is 0.");
          return;
        }
      
      tmp_list = seg->body.child.widgets;
      while (tmp_list)
        {
          g_object_unref (tmp_list->data);
          tmp_list = g_slist_next (tmp_list);
        }
  
      g_slist_free (seg->body.child.widgets);
  
      g_free (seg);
    }

  anchor->segment = NULL;

  G_OBJECT_CLASS (gtk_text_child_anchor_parent_class)->finalize (obj);
}

/**
* gtk_text_child_anchor_get_widgets:
* @anchor: a #GtkTextChildAnchor
*
* Gets a list of all widgets anchored at this child anchor.
* The returned list should be freed with g_list_free().
*
*
* Return value: (element-type GtkWidget) (transfer container): list of widgets anchored at @anchor
**/
GList*
gtk_text_child_anchor_get_widgets (GtkTextChildAnchor *anchor)
{
  GtkTextLineSegment *seg = anchor->segment;
  GList *list = NULL;
  GSList *iter;

  CHECK_IN_BUFFER_RETURN (anchor, NULL);
  
  g_return_val_if_fail (seg->type == &gtk_text_child_type, NULL);

  iter = seg->body.child.widgets;
  while (iter != NULL)
    {
      list = g_list_prepend (list, iter->data);

      iter = g_slist_next (iter);
    }

  /* Order is not relevant, so we don't need to reverse the list
* again.
*/
  return list;
}

/**
* gtk_text_child_anchor_get_deleted:
* @anchor: a #GtkTextChildAnchor
*
* Determines whether a child anchor has been deleted from
* the buffer. Keep in mind that the child anchor will be
* unreferenced when removed from the buffer, so you need to
* hold your own reference (with g_object_ref()) if you plan
* to use this function &mdash; otherwise all deleted child anchors
* will also be finalized.
*
* Return value: %TRUE if the child anchor has been deleted from its buffer
**/
gboolean
gtk_text_child_anchor_get_deleted (GtkTextChildAnchor *anchor)
{
  GtkTextLineSegment *seg = anchor->segment;

  CHECK_IN_BUFFER_RETURN (anchor, TRUE);
  
  g_return_val_if_fail (seg->type == &gtk_text_child_type, TRUE);

  return seg->body.child.tree == NULL;
}

void
gtk_text_child_anchor_register_child (GtkTextChildAnchor *anchor,
                                      GtkWidget *child,
                                      GtkTextLayout *layout)
{
  g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
  g_return_if_fail (GTK_IS_WIDGET (child));

  CHECK_IN_BUFFER (anchor);
  
  _gtk_anchored_child_set_layout (child, layout);
  
  _gtk_widget_segment_add (anchor->segment, child);

  gtk_text_child_anchor_queue_resize (anchor, layout);
}

void
gtk_text_child_anchor_unregister_child (GtkTextChildAnchor *anchor,
                                        GtkWidget *child)
{
  g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
  g_return_if_fail (GTK_IS_WIDGET (child));

  CHECK_IN_BUFFER (anchor);
  
  if (_gtk_anchored_child_get_layout (child))
    {
      gtk_text_child_anchor_queue_resize (anchor,
                                          _gtk_anchored_child_get_layout (child));
    }
  
  _gtk_anchored_child_set_layout (child, NULL);
  
  _gtk_widget_segment_remove (anchor->segment, child);
}

void
gtk_text_child_anchor_queue_resize (GtkTextChildAnchor *anchor,
                                    GtkTextLayout *layout)
{
  GtkTextIter start;
  GtkTextIter end;
  GtkTextLineSegment *seg;
  
  g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));

  CHECK_IN_BUFFER (anchor);
  
  seg = anchor->segment;

  if (seg->body.child.tree == NULL)
    return;
  
  gtk_text_buffer_get_iter_at_child_anchor (layout->buffer,
                                            &start, anchor);
  end = start;
  gtk_text_iter_forward_char (&end);
  
  gtk_text_layout_invalidate (layout, &start, &end);
}

void
gtk_text_anchored_child_set_layout (GtkWidget *child,
                                    GtkTextLayout *layout)
{
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (layout == NULL || GTK_IS_TEXT_LAYOUT (layout));
  
  _gtk_anchored_child_set_layout (child, layout);
}
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