1 /* gtktextmark.c - mark segments
3 * Copyright (c) 1994 The Regents of the University of California.
4 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
5 * Copyright (c) 2000 Red Hat, Inc.
6 * Tk -> Gtk port by Havoc Pennington <hp@redhat.com>
8 * This software is copyrighted by the Regents of the University of
9 * California, Sun Microsystems, Inc., and other parties. The
10 * following terms apply to all files associated with the software
11 * unless explicitly disclaimed in individual files.
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19 * software may be copyrighted by their authors and need not follow
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25 * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
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38 * in the software and related documentation as defined in the Federal
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50 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
52 #include "gtktextbtree.h"
56 static void gtk_text_mark_init (GtkTextMark *mark);
57 static void gtk_text_mark_class_init (GtkTextMarkClass *klass);
58 static void gtk_text_mark_finalize (GObject *obj);
61 static gpointer parent_class = NULL;
64 gtk_text_mark_get_type (void)
66 static GType object_type = 0;
70 static const GTypeInfo object_info =
72 sizeof (GtkTextMarkClass),
74 (GBaseFinalizeFunc) NULL,
75 (GClassInitFunc) gtk_text_mark_class_init,
76 NULL, /* class_finalize */
77 NULL, /* class_data */
80 (GInstanceInitFunc) gtk_text_mark_init,
83 object_type = g_type_register_static (G_TYPE_OBJECT, I_("GtkTextMark"),
91 gtk_text_mark_init (GtkTextMark *mark)
97 gtk_text_mark_class_init (GtkTextMarkClass *klass)
99 GObjectClass *object_class = G_OBJECT_CLASS (klass);
101 parent_class = g_type_class_peek_parent (klass);
103 object_class->finalize = gtk_text_mark_finalize;
107 gtk_text_mark_finalize (GObject *obj)
110 GtkTextLineSegment *seg;
112 mark = GTK_TEXT_MARK (obj);
118 if (seg->body.mark.tree != NULL)
119 g_warning ("GtkTextMark being finalized while still in the buffer; "
120 "someone removed a reference they didn't own! Crash "
123 g_free (seg->body.mark.name);
126 mark->segment = NULL;
129 /* chain parent_class' handler */
130 G_OBJECT_CLASS (parent_class)->finalize (obj);
134 * gtk_text_mark_get_visible:
135 * @mark: a #GtkTextMark
137 * Returns %TRUE if the mark is visible (i.e. a cursor is displayed
140 * Return value: %TRUE if visible
143 gtk_text_mark_get_visible (GtkTextMark *mark)
145 GtkTextLineSegment *seg;
149 return seg->body.mark.visible;
153 * gtk_text_mark_get_name:
154 * @mark: a #GtkTextMark
156 * Returns the mark name; returns NULL for anonymous marks.
158 * Return value: mark name
161 gtk_text_mark_get_name (GtkTextMark *mark)
163 GtkTextLineSegment *seg;
167 return seg->body.mark.name;
171 * gtk_text_mark_get_deleted:
172 * @mark: a #GtkTextMark
174 * Returns %TRUE if the mark has been removed from its buffer
175 * with gtk_text_buffer_delete_mark(). Marks can't be used
178 * Return value: whether the mark is deleted
181 gtk_text_mark_get_deleted (GtkTextMark *mark)
183 GtkTextLineSegment *seg;
185 g_return_val_if_fail (GTK_IS_TEXT_MARK (mark), FALSE);
192 return seg->body.mark.tree == NULL;
196 * gtk_text_mark_get_buffer:
197 * @mark: a #GtkTextMark
199 * Gets the buffer this mark is located inside,
200 * or NULL if the mark is deleted.
202 * Return value: the mark's #GtkTextBuffer
205 gtk_text_mark_get_buffer (GtkTextMark *mark)
207 GtkTextLineSegment *seg;
209 g_return_val_if_fail (GTK_IS_TEXT_MARK (mark), NULL);
213 if (seg->body.mark.tree == NULL)
216 return _gtk_text_btree_get_buffer (seg->body.mark.tree);
220 * gtk_text_mark_get_left_gravity:
221 * @mark: a #GtkTextMark
223 * Determines whether the mark has left gravity.
225 * Return value: %TRUE if the mark has left gravity, %FALSE otherwise
228 gtk_text_mark_get_left_gravity (GtkTextMark *mark)
230 GtkTextLineSegment *seg;
232 g_return_val_if_fail (GTK_IS_TEXT_MARK (mark), FALSE);
236 return seg->type == >k_text_left_mark_type;
240 * Macro that determines the size of a mark segment:
243 #define MSEG_SIZE ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
244 + sizeof (GtkTextMarkBody)))
248 _gtk_mark_segment_new (GtkTextBTree *tree,
249 gboolean left_gravity,
252 GtkTextLineSegment *mark;
254 mark = (GtkTextLineSegment *) g_malloc0 (MSEG_SIZE);
255 mark->body.mark.name = g_strdup (name);
258 mark->type = >k_text_left_mark_type;
260 mark->type = >k_text_right_mark_type;
262 mark->byte_count = 0;
263 mark->char_count = 0;
265 mark->body.mark.obj = g_object_new (GTK_TYPE_TEXT_MARK, NULL);
266 mark->body.mark.obj->segment = mark;
268 mark->body.mark.tree = tree;
269 mark->body.mark.line = NULL;
272 mark->body.mark.visible = FALSE;
273 mark->body.mark.not_deleteable = FALSE;
278 static int mark_segment_delete_func (GtkTextLineSegment *segPtr,
281 static GtkTextLineSegment *mark_segment_cleanup_func (GtkTextLineSegment *segPtr,
283 static void mark_segment_check_func (GtkTextLineSegment *segPtr,
288 * The following structures declare the "mark" segment types.
289 * There are actually two types for marks, one with left gravity
290 * and one with right gravity. They are identical except for
291 * their gravity property.
294 GtkTextLineSegmentClass gtk_text_right_mark_type = {
296 FALSE, /* leftGravity */
297 NULL, /* splitFunc */
298 mark_segment_delete_func, /* deleteFunc */
299 mark_segment_cleanup_func, /* cleanupFunc */
300 NULL, /* lineChangeFunc */
301 mark_segment_check_func /* checkFunc */
304 GtkTextLineSegmentClass gtk_text_left_mark_type = {
306 TRUE, /* leftGravity */
307 NULL, /* splitFunc */
308 mark_segment_delete_func, /* deleteFunc */
309 mark_segment_cleanup_func, /* cleanupFunc */
310 NULL, /* lineChangeFunc */
311 mark_segment_check_func /* checkFunc */
315 *--------------------------------------------------------------
317 * mark_segment_delete_func --
319 * This procedure is invoked by the text B-tree code whenever
320 * a mark lies in a range of characters being deleted.
323 * Returns 1 to indicate that deletion has been rejected,
327 * Frees mark if tree is going away
329 *--------------------------------------------------------------
333 mark_segment_delete_func (GtkTextLineSegment *seg,
339 _gtk_text_btree_release_mark_segment (seg->body.mark.tree, seg);
347 *--------------------------------------------------------------
349 * mark_segment_cleanup_func --
351 * This procedure is invoked by the B-tree code whenever a
352 * mark segment is moved from one line to another.
358 * The line field of the segment gets updated.
360 *--------------------------------------------------------------
363 static GtkTextLineSegment *
364 mark_segment_cleanup_func (GtkTextLineSegment *seg,
367 /* not sure why Tk did this here and not in LineChangeFunc */
368 seg->body.mark.line = line;
373 *--------------------------------------------------------------
375 * mark_segment_check_func --
377 * This procedure is invoked by the B-tree code to perform
378 * consistency checks on mark segments.
384 * The procedure panics if it detects anything wrong with
387 *--------------------------------------------------------------
391 mark_segment_check_func (GtkTextLineSegment *seg,
394 if (seg->body.mark.line != line)
395 g_error ("mark_segment_check_func: seg->body.mark.line bogus");
398 #define __GTK_TEXT_MARK_C__
399 #include "gtkaliasdef.c"