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/* GTK - The GIMP Toolkit
* gtktextsegment.h Copyright (C) 2000 Red Hat, Inc.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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/.
*/
#ifndef __GTK_TEXT_SEGMENT_H__
#define __GTK_TEXT_SEGMENT_H__
#include <gtk/gtktexttag.h>
#include <gtk/gtktextiter.h>
#include <gtk/gtktextmarkprivate.h>
#include <gtk/gtktextchild.h>
#include <gtk/gtktextchildprivate.h>
G_BEGIN_DECLS
/*
* Segments: each line is divided into one or more segments, where each
* segment is one of several things, such as a group of characters, a
* tag toggle, a mark, or an embedded widget. Each segment starts with
* a standard header followed by a body that varies from type to type.
*/
/* This header has the segment type, and two specific segments
(character and toggle segments) */
/* Information a BTree stores about a tag. */
typedef struct _GtkTextTagInfo GtkTextTagInfo;
struct _GtkTextTagInfo {
GtkTextTag *tag;
GtkTextBTreeNode *tag_root; /* highest-level node containing the tag */
int toggle_count; /* total toggles of this tag below tag_root */
};
/* Body of a segment that toggles a tag on or off */
struct _GtkTextToggleBody {
GtkTextTagInfo *info; /* Tag that starts or ends here. */
gboolean inNodeCounts; /* TRUE means this toggle has been
* accounted for in node toggle
* counts; FALSE means it hasn't, yet. */
};
/* Class struct for segments */
/* Split seg at index, returning list of two new segments, and freeing seg */
typedef GtkTextLineSegment* (*GtkTextSegSplitFunc) (GtkTextLineSegment *seg,
int index);
/* Delete seg which is contained in line; if tree_gone, the tree is being
* freed in its entirety, which may matter for some reason (?)
* Return TRUE if the segment is not deleteable, e.g. a mark.
*/
typedef gboolean (*GtkTextSegDeleteFunc) (GtkTextLineSegment *seg,
GtkTextLine *line,
gboolean tree_gone);
/* Called after segment structure of line changes, so segments can
* cleanup (e.g. merge with adjacent segments). Returns a segment list
* to replace the original segment list with. The line argument is
* the current line.
*/
typedef GtkTextLineSegment* (*GtkTextSegCleanupFunc) (GtkTextLineSegment *seg,
GtkTextLine *line);
/* Called when a segment moves from one line to another. CleanupFunc is also
* called in that case, so many segments just use CleanupFunc, I'm not sure
* what’s up with that (this function may not be needed...)
*/
typedef void (*GtkTextSegLineChangeFunc) (GtkTextLineSegment *seg,
GtkTextLine *line);
/* Called to do debug checks on the segment. */
typedef void (*GtkTextSegCheckFunc) (GtkTextLineSegment *seg,
GtkTextLine *line);
struct _GtkTextLineSegmentClass {
const char *name; /* Name of this kind of segment. */
gboolean leftGravity; /* If a segment has zero size (e.g. a
* mark or tag toggle), does it
* attach to character to its left
* or right? 1 means left, 0 means
* right. */
GtkTextSegSplitFunc splitFunc; /* Procedure to split large segment
* into two smaller ones. */
GtkTextSegDeleteFunc deleteFunc; /* Procedure to call to delete
* segment. */
GtkTextSegCleanupFunc cleanupFunc; /* After any change to a line, this
* procedure is invoked for all
* segments left in the line to
* perform any cleanup they wish
* (e.g. joining neighboring
* segments). */
GtkTextSegLineChangeFunc lineChangeFunc;
/* Invoked when a segment is about
* to be moved from its current line
* to an earlier line because of
* a deletion. The line is that
* for the segment's old line.
* CleanupFunc will be invoked after
* the deletion is finished. */
GtkTextSegCheckFunc checkFunc; /* Called during consistency checks
* to check internal consistency of
* segment. */
};
/*
* The data structure below defines line segments.
*/
struct _GtkTextLineSegment {
const GtkTextLineSegmentClass *type; /* Pointer to record describing
* segment's type. */
GtkTextLineSegment *next; /* Next in list of segments for this
* line, or NULL for end of list. */
int char_count; /* # of chars of index space occupied */
int byte_count; /* Size of this segment (# of bytes
* of index space it occupies). */
union {
char chars[4]; /* Characters that make up character
* info. Actual length varies to
* hold as many characters as needed.*/
GtkTextToggleBody toggle; /* Information about tag toggle. */
GtkTextMarkBody mark; /* Information about mark. */
GtkTextPaintable paintable; /* Child texture */
GtkTextChildBody child; /* Child widget */
} body;
};
GtkTextLineSegment *gtk_text_line_segment_split (const GtkTextIter *iter);
GtkTextLineSegment *_gtk_char_segment_new (const char *text,
guint len);
GtkTextLineSegment *_gtk_char_segment_new_from_two_strings (const char *text1,
guint len1,
guint chars1,
const char *text2,
guint len2,
guint chars2);
GtkTextLineSegment *_gtk_toggle_segment_new (GtkTextTagInfo *info,
gboolean on);
void _gtk_toggle_segment_free (GtkTextLineSegment *seg);
G_END_DECLS
#endif
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