forked from AuroraMiddleware/gtk
983a03d5f8
Use GSlice to allocate all types of segments: - char - toggle - mark - pixbuf - child widget Char segments are a bit more complicated because the length of the text is determined at run time and stored in the 'byte_count' field. If the text is long, GSlice will call the system malloc() anyway, so it's better to always use GSlice for GtkTextLineSegment. Toggle segments are also freed in gtktextbtree.c, hence the function _gtk_toggle_segment_free() (for a later commit it would be nice to rename those functions with the _gtk_text prefix). https://bugzilla.gnome.org/show_bug.cgi?id=727908
174 lines
7.6 KiB
C
174 lines
7.6 KiB
C
/* GTK - The GIMP Toolkit
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* gtktextsegment.h Copyright (C) 2000 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __GTK_TEXT_SEGMENT_H__
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#define __GTK_TEXT_SEGMENT_H__
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#include <gtk/gtktexttag.h>
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#include <gtk/gtktextiter.h>
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#include <gtk/gtktextmarkprivate.h>
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#include <gtk/gtktextchild.h>
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#include <gtk/gtktextchildprivate.h>
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G_BEGIN_DECLS
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/*
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* Segments: each line is divided into one or more segments, where each
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* segment is one of several things, such as a group of characters, a
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* tag toggle, a mark, or an embedded widget. Each segment starts with
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* a standard header followed by a body that varies from type to type.
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*/
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/* This header has the segment type, and two specific segments
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(character and toggle segments) */
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/* Information a BTree stores about a tag. */
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typedef struct _GtkTextTagInfo GtkTextTagInfo;
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struct _GtkTextTagInfo {
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GtkTextTag *tag;
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GtkTextBTreeNode *tag_root; /* highest-level node containing the tag */
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gint toggle_count; /* total toggles of this tag below tag_root */
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};
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/* Body of a segment that toggles a tag on or off */
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struct _GtkTextToggleBody {
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GtkTextTagInfo *info; /* Tag that starts or ends here. */
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gboolean inNodeCounts; /* TRUE means this toggle has been
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* accounted for in node toggle
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* counts; FALSE means it hasn't, yet. */
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};
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/* Class struct for segments */
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/* Split seg at index, returning list of two new segments, and freeing seg */
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typedef GtkTextLineSegment* (*GtkTextSegSplitFunc) (GtkTextLineSegment *seg,
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gint index);
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/* Delete seg which is contained in line; if tree_gone, the tree is being
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* freed in its entirety, which may matter for some reason (?)
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* Return TRUE if the segment is not deleteable, e.g. a mark.
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*/
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typedef gboolean (*GtkTextSegDeleteFunc) (GtkTextLineSegment *seg,
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GtkTextLine *line,
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gboolean tree_gone);
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/* Called after segment structure of line changes, so segments can
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* cleanup (e.g. merge with adjacent segments). Returns a segment list
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* to replace the original segment list with. The line argument is
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* the current line.
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*/
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typedef GtkTextLineSegment* (*GtkTextSegCleanupFunc) (GtkTextLineSegment *seg,
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GtkTextLine *line);
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/* Called when a segment moves from one line to another. CleanupFunc is also
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* called in that case, so many segments just use CleanupFunc, I'm not sure
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* what’s up with that (this function may not be needed...)
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*/
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typedef void (*GtkTextSegLineChangeFunc) (GtkTextLineSegment *seg,
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GtkTextLine *line);
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/* Called to do debug checks on the segment. */
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typedef void (*GtkTextSegCheckFunc) (GtkTextLineSegment *seg,
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GtkTextLine *line);
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struct _GtkTextLineSegmentClass {
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char *name; /* Name of this kind of segment. */
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gboolean leftGravity; /* If a segment has zero size (e.g. a
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* mark or tag toggle), does it
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* attach to character to its left
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* or right? 1 means left, 0 means
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* right. */
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GtkTextSegSplitFunc splitFunc; /* Procedure to split large segment
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* into two smaller ones. */
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GtkTextSegDeleteFunc deleteFunc; /* Procedure to call to delete
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* segment. */
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GtkTextSegCleanupFunc cleanupFunc; /* After any change to a line, this
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* procedure is invoked for all
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* segments left in the line to
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* perform any cleanup they wish
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* (e.g. joining neighboring
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* segments). */
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GtkTextSegLineChangeFunc lineChangeFunc;
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/* Invoked when a segment is about
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* to be moved from its current line
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* to an earlier line because of
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* a deletion. The line is that
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* for the segment's old line.
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* CleanupFunc will be invoked after
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* the deletion is finished. */
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GtkTextSegCheckFunc checkFunc; /* Called during consistency checks
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* to check internal consistency of
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* segment. */
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};
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/*
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* The data structure below defines line segments.
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*/
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struct _GtkTextLineSegment {
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const GtkTextLineSegmentClass *type; /* Pointer to record describing
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* segment's type. */
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GtkTextLineSegment *next; /* Next in list of segments for this
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* line, or NULL for end of list. */
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int char_count; /* # of chars of index space occupied */
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int byte_count; /* Size of this segment (# of bytes
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* of index space it occupies). */
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union {
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char chars[4]; /* Characters that make up character
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* info. Actual length varies to
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* hold as many characters as needed.*/
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GtkTextToggleBody toggle; /* Information about tag toggle. */
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GtkTextMarkBody mark; /* Information about mark. */
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GtkTextPixbuf pixbuf; /* Child pixbuf */
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GtkTextChildBody child; /* Child widget */
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} body;
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};
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GDK_AVAILABLE_IN_ALL
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GtkTextLineSegment *gtk_text_line_segment_split (const GtkTextIter *iter);
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GtkTextLineSegment *_gtk_char_segment_new (const gchar *text,
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guint len);
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GtkTextLineSegment *_gtk_char_segment_new_from_two_strings (const gchar *text1,
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guint len1,
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guint chars1,
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const gchar *text2,
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guint len2,
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guint chars2);
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GtkTextLineSegment *_gtk_toggle_segment_new (GtkTextTagInfo *info,
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gboolean on);
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void _gtk_toggle_segment_free (GtkTextLineSegment *seg);
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G_END_DECLS
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#endif
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