Pileus Git - ~andy/gtk/blob - gtk/gtktextchild.c

   1 /* gtktextchild.c - child pixmaps and widgets
   2  *
   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>
   7  *
   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.
  12  *
  13  * The authors hereby grant permission to use, copy, modify,
  14  * distribute, and license this software and its documentation for any
  15  * purpose, provided that existing copyright notices are retained in
  16  * all copies and that this notice is included verbatim in any
  17  * distributions. No written agreement, license, or royalty fee is
  18  * required for any of the authorized uses.  Modifications to this
  19  * software may be copyrighted by their authors and need not follow
  20  * the licensing terms described here, provided that the new terms are
  21  * clearly indicated on the first page of each file where they apply.
  22  *
  23  * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
  24  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
  25  * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
  26  * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
  27  * OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
  30  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  31  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
  32  * NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
  33  * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
  34  * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  35  *
  36  * GOVERNMENT USE: If you are acquiring this software on behalf of the
  37  * U.S. government, the Government shall have only "Restricted Rights"
  38  * in the software and related documentation as defined in the Federal
  39  * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2).  If you
  40  * are acquiring the software on behalf of the Department of Defense,
  41  * the software shall be classified as "Commercial Computer Software"
  42  * and the Government shall have only "Restricted Rights" as defined
  43  * in Clause 252.227-7013 (c) (1) of DFARs.  Notwithstanding the
  44  * foregoing, the authors grant the U.S. Government and others acting
  45  * in its behalf permission to use and distribute the software in
  46  * accordance with the terms specified in this license.
  47  *
  48  */
  49
  50 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
  51 #include <config.h>
  52 #include "gtktextchild.h"
  53 #include "gtktextbtree.h"
  54 #include "gtktextlayout.h"
  55 #include "gtkintl.h"
  56 #include "gtkalias.h"
  57
  58 #define CHECK_IN_BUFFER(anchor)                                                            \
  59   G_STMT_START {                                                                           \
  60     if ((anchor)->segment == NULL)                                                         \
  61       {                                                                                    \
  62         g_warning ("%s: GtkTextChildAnchor hasn't been in a buffer yet", G_GNUC_FUNCTION); \
  63       }                                                                                    \
  64   } G_STMT_END
  65
  66 #define CHECK_IN_BUFFER_RETURN(anchor, val)                                                \
  67   G_STMT_START {                                                                           \
  68     if ((anchor)->segment == NULL)                                                         \
  69       {                                                                                    \
  70         g_warning ("%s: GtkTextChildAnchor hasn't been in a buffer yet", G_GNUC_FUNCTION); \
  71         return (val);                                                                      \
  72       }                                                                                    \
  73   } G_STMT_END
  74
  75 static GtkTextLineSegment *
  76 pixbuf_segment_cleanup_func (GtkTextLineSegment *seg,
  77                              GtkTextLine        *line)
  78 {
  79   /* nothing */
  80   return seg;
  81 }
  82
  83 static int
  84 pixbuf_segment_delete_func (GtkTextLineSegment *seg,
  85                             GtkTextLine        *line,
  86                             gboolean            tree_gone)
  87 {
  88   if (seg->body.pixbuf.pixbuf)
  89     g_object_unref (seg->body.pixbuf.pixbuf);
  90
  91   g_free (seg);
  92
  93   return 0;
  94 }
  95
  96 static void
  97 pixbuf_segment_check_func (GtkTextLineSegment *seg,
  98                            GtkTextLine        *line)
  99 {
 100   if (seg->next == NULL)
 101     g_error ("pixbuf segment is the last segment in a line");
 102
 103   if (seg->byte_count != 3)
 104     g_error ("pixbuf segment has byte count of %d", seg->byte_count);
 105
 106   if (seg->char_count != 1)
 107     g_error ("pixbuf segment has char count of %d", seg->char_count);
 108 }
 109
 110
 111 const GtkTextLineSegmentClass gtk_text_pixbuf_type = {
 112   "pixbuf",                          /* name */
 113   FALSE,                                            /* leftGravity */
 114   NULL,                                          /* splitFunc */
 115   pixbuf_segment_delete_func,                             /* deleteFunc */
 116   pixbuf_segment_cleanup_func,                            /* cleanupFunc */
 117   NULL,                                                    /* lineChangeFunc */
 118   pixbuf_segment_check_func                               /* checkFunc */
 119
 120 };
 121
 122 #define PIXBUF_SEG_SIZE ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
 123         + sizeof (GtkTextPixbuf)))
 124
 125 GtkTextLineSegment *
 126 _gtk_pixbuf_segment_new (GdkPixbuf *pixbuf)
 127 {
 128   GtkTextLineSegment *seg;
 129
 130   seg = g_malloc (PIXBUF_SEG_SIZE);
 131
 132   seg->type = &gtk_text_pixbuf_type;
 133
 134   seg->next = NULL;
 135
 136   seg->byte_count = 3; /* We convert to the 0xFFFC "unknown character",
 137                         * a 3-byte sequence in UTF-8
 138                         */
 139   seg->char_count = 1;
 140
 141   seg->body.pixbuf.pixbuf = pixbuf;
 142
 143   g_object_ref (pixbuf);
 144
 145   return seg;
 146 }
 147
 148
 149 static GtkTextLineSegment *
 150 child_segment_cleanup_func (GtkTextLineSegment *seg,
 151                             GtkTextLine        *line)
 152 {
 153   seg->body.child.line = line;
 154
 155   return seg;
 156 }
 157
 158 static int
 159 child_segment_delete_func (GtkTextLineSegment *seg,
 160                            GtkTextLine       *line,
 161                            gboolean           tree_gone)
 162 {
 163   GSList *tmp_list;
 164   GSList *copy;
 165
 166   _gtk_text_btree_unregister_child_anchor (seg->body.child.obj);
 167
 168   seg->body.child.tree = NULL;
 169   seg->body.child.line = NULL;
 170
 171   /* avoid removing widgets while walking the list */
 172   copy = g_slist_copy (seg->body.child.widgets);
 173   tmp_list = copy;
 174   while (tmp_list != NULL)
 175     {
 176       GtkWidget *child = tmp_list->data;
 177
 178       gtk_widget_destroy (child);
 179
 180       tmp_list = g_slist_next (tmp_list);
 181     }
 182
 183   /* On removal from the widget's parents (GtkTextView),
 184    * the widget should have been removed from the anchor.
 185    */
 186   g_assert (seg->body.child.widgets == NULL);
 187
 188   g_slist_free (copy);
 189
 190   _gtk_widget_segment_unref (seg);
 191
 192   return 0;
 193 }
 194
 195 static void
 196 child_segment_check_func (GtkTextLineSegment *seg,
 197                           GtkTextLine        *line)
 198 {
 199   if (seg->next == NULL)
 200     g_error ("child segment is the last segment in a line");
 201
 202   if (seg->byte_count != 3)
 203     g_error ("child segment has byte count of %d", seg->byte_count);
 204
 205   if (seg->char_count != 1)
 206     g_error ("child segment has char count of %d", seg->char_count);
 207 }
 208
 209 const GtkTextLineSegmentClass gtk_text_child_type = {
 210   "child-widget",                                        /* name */
 211   FALSE,                                                 /* leftGravity */
 212   NULL,                                                  /* splitFunc */
 213   child_segment_delete_func,                             /* deleteFunc */
 214   child_segment_cleanup_func,                            /* cleanupFunc */
 215   NULL,                                                  /* lineChangeFunc */
 216   child_segment_check_func                               /* checkFunc */
 217 };
 218
 219 #define WIDGET_SEG_SIZE ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
 220         + sizeof (GtkTextChildBody)))
 221
 222 GtkTextLineSegment *
 223 _gtk_widget_segment_new (GtkTextChildAnchor *anchor)
 224 {
 225   GtkTextLineSegment *seg;
 226
 227   seg = g_malloc (WIDGET_SEG_SIZE);
 228
 229   seg->type = &gtk_text_child_type;
 230
 231   seg->next = NULL;
 232
 233   seg->byte_count = 3; /* We convert to the 0xFFFC "unknown character",
 234                         * a 3-byte sequence in UTF-8
 235                         */
 236   seg->char_count = 1;
 237
 238   seg->body.child.obj = anchor;
 239   seg->body.child.obj->segment = seg;
 240   seg->body.child.widgets = NULL;
 241   seg->body.child.tree = NULL;
 242   seg->body.child.line = NULL;
 243
 244   g_object_ref (anchor);
 245
 246   return seg;
 247 }
 248
 249 void
 250 _gtk_widget_segment_add    (GtkTextLineSegment *widget_segment,
 251                             GtkWidget          *child)
 252 {
 253   g_return_if_fail (widget_segment->type == &gtk_text_child_type);
 254   g_return_if_fail (widget_segment->body.child.tree != NULL);
 255
 256   g_object_ref (child);
 257
 258   widget_segment->body.child.widgets =
 259     g_slist_prepend (widget_segment->body.child.widgets,
 260                      child);
 261 }
 262
 263 void
 264 _gtk_widget_segment_remove (GtkTextLineSegment *widget_segment,
 265                             GtkWidget          *child)
 266 {
 267   g_return_if_fail (widget_segment->type == &gtk_text_child_type);
 268
 269   widget_segment->body.child.widgets =
 270     g_slist_remove (widget_segment->body.child.widgets,
 271                     child);
 272
 273   g_object_unref (child);
 274 }
 275
 276 void
 277 _gtk_widget_segment_ref (GtkTextLineSegment *widget_segment)
 278 {
 279   g_assert (widget_segment->type == &gtk_text_child_type);
 280
 281   g_object_ref (widget_segment->body.child.obj);
 282 }
 283
 284 void
 285 _gtk_widget_segment_unref (GtkTextLineSegment *widget_segment)
 286 {
 287   g_assert (widget_segment->type == &gtk_text_child_type);
 288
 289   g_object_unref (widget_segment->body.child.obj);
 290 }
 291
 292 GtkTextLayout*
 293 _gtk_anchored_child_get_layout (GtkWidget *child)
 294 {
 295   return g_object_get_data (G_OBJECT (child), "gtk-text-child-anchor-layout");
 296 }
 297
 298 static void
 299 _gtk_anchored_child_set_layout (GtkWidget     *child,
 300                                 GtkTextLayout *layout)
 301 {
 302   g_object_set_data (G_OBJECT (child),
 303                      I_("gtk-text-child-anchor-layout"),
 304                      layout);
 305 }
 306
 307 static void gtk_text_child_anchor_finalize (GObject *obj);
 308
 309 G_DEFINE_TYPE (GtkTextChildAnchor, gtk_text_child_anchor, G_TYPE_OBJECT);
 310
 311 static void
 312 gtk_text_child_anchor_init (GtkTextChildAnchor *child_anchor)
 313 {
 314   child_anchor->segment = NULL;
 315 }
 316
 317 static void
 318 gtk_text_child_anchor_class_init (GtkTextChildAnchorClass *klass)
 319 {
 320   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 321
 322   object_class->finalize = gtk_text_child_anchor_finalize;
 323 }
 324
 325 /**
 326  * gtk_text_child_anchor_new:
 327  *
 328  * Creates a new #GtkTextChildAnchor. Usually you would then insert
 329  * it into a #GtkTextBuffer with gtk_text_buffer_insert_child_anchor().
 330  * To perform the creation and insertion in one step, use the
 331  * convenience function gtk_text_buffer_create_child_anchor().
 332  *
 333  * Return value: a new #GtkTextChildAnchor
 334  **/
 335 GtkTextChildAnchor*
 336 gtk_text_child_anchor_new (void)
 337 {
 338   return g_object_new (GTK_TYPE_TEXT_CHILD_ANCHOR, NULL);
 339 }
 340
 341 static void
 342 gtk_text_child_anchor_finalize (GObject *obj)
 343 {
 344   GtkTextChildAnchor *anchor;
 345   GSList *tmp_list;
 346   GtkTextLineSegment *seg;
 347
 348   anchor = GTK_TEXT_CHILD_ANCHOR (obj);
 349
 350   seg = anchor->segment;
 351
 352   if (seg)
 353     {
 354       if (seg->body.child.tree != NULL)
 355         {
 356           g_warning ("Someone removed a reference to a GtkTextChildAnchor "
 357                      "they didn't own; the anchor is still in the text buffer "
 358                      "and the refcount is 0.");
 359           return;
 360         }
 361
 362       tmp_list = seg->body.child.widgets;
 363       while (tmp_list)
 364         {
 365           g_object_unref (tmp_list->data);
 366           tmp_list = g_slist_next (tmp_list);
 367         }
 368
 369       g_slist_free (seg->body.child.widgets);
 370
 371       g_free (seg);
 372     }
 373
 374   anchor->segment = NULL;
 375
 376   G_OBJECT_CLASS (gtk_text_child_anchor_parent_class)->finalize (obj);
 377 }
 378
 379 /**
 380  * gtk_text_child_anchor_get_widgets:
 381  * @anchor: a #GtkTextChildAnchor
 382  *
 383  * Gets a list of all widgets anchored at this child anchor.
 384  * The returned list should be freed with g_list_free().
 385  *
 386  *
 387  * Return value: list of widgets anchored at @anchor
 388  **/
 389 GList*
 390 gtk_text_child_anchor_get_widgets (GtkTextChildAnchor *anchor)
 391 {
 392   GtkTextLineSegment *seg = anchor->segment;
 393   GList *list = NULL;
 394   GSList *iter;
 395
 396   CHECK_IN_BUFFER_RETURN (anchor, NULL);
 397
 398   g_return_val_if_fail (seg->type == &gtk_text_child_type, NULL);
 399
 400   iter = seg->body.child.widgets;
 401   while (iter != NULL)
 402     {
 403       list = g_list_prepend (list, iter->data);
 404
 405       iter = g_slist_next (iter);
 406     }
 407
 408   /* Order is not relevant, so we don't need to reverse the list
 409    * again.
 410    */
 411   return list;
 412 }
 413
 414 /**
 415  * gtk_text_child_anchor_get_deleted:
 416  * @anchor: a #GtkTextChildAnchor
 417  *
 418  * Determines whether a child anchor has been deleted from
 419  * the buffer. Keep in mind that the child anchor will be
 420  * unreferenced when removed from the buffer, so you need to
 421  * hold your own reference (with g_object_ref()) if you plan
 422  * to use this function &mdash; otherwise all deleted child anchors
 423  * will also be finalized.
 424  *
 425  * Return value: %TRUE if the child anchor has been deleted from its buffer
 426  **/
 427 gboolean
 428 gtk_text_child_anchor_get_deleted (GtkTextChildAnchor *anchor)
 429 {
 430   GtkTextLineSegment *seg = anchor->segment;
 431
 432   CHECK_IN_BUFFER_RETURN (anchor, TRUE);
 433
 434   g_return_val_if_fail (seg->type == &gtk_text_child_type, TRUE);
 435
 436   return seg->body.child.tree == NULL;
 437 }
 438
 439 void
 440 gtk_text_child_anchor_register_child (GtkTextChildAnchor *anchor,
 441                                       GtkWidget          *child,
 442                                       GtkTextLayout      *layout)
 443 {
 444   g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
 445   g_return_if_fail (GTK_IS_WIDGET (child));
 446
 447   CHECK_IN_BUFFER (anchor);
 448
 449   _gtk_anchored_child_set_layout (child, layout);
 450
 451   _gtk_widget_segment_add (anchor->segment, child);
 452
 453   gtk_text_child_anchor_queue_resize (anchor, layout);
 454 }
 455
 456 void
 457 gtk_text_child_anchor_unregister_child (GtkTextChildAnchor *anchor,
 458                                         GtkWidget          *child)
 459 {
 460   g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
 461   g_return_if_fail (GTK_IS_WIDGET (child));
 462
 463   CHECK_IN_BUFFER (anchor);
 464
 465   if (_gtk_anchored_child_get_layout (child))
 466     {
 467       gtk_text_child_anchor_queue_resize (anchor,
 468                                           _gtk_anchored_child_get_layout (child));
 469     }
 470
 471   _gtk_anchored_child_set_layout (child, NULL);
 472
 473   _gtk_widget_segment_remove (anchor->segment, child);
 474 }
 475
 476 void
 477 gtk_text_child_anchor_queue_resize (GtkTextChildAnchor *anchor,
 478                                     GtkTextLayout      *layout)
 479 {
 480   GtkTextIter start;
 481   GtkTextIter end;
 482   GtkTextLineSegment *seg;
 483
 484   g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
 485   g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
 486
 487   CHECK_IN_BUFFER (anchor);
 488
 489   seg = anchor->segment;
 490
 491   if (seg->body.child.tree == NULL)
 492     return;
 493
 494   gtk_text_buffer_get_iter_at_child_anchor (layout->buffer,
 495                                             &start, anchor);
 496   end = start;
 497   gtk_text_iter_forward_char (&end);
 498
 499   gtk_text_layout_invalidate (layout, &start, &end);
 500 }
 501
 502 void
 503 gtk_text_anchored_child_set_layout (GtkWidget     *child,
 504                                     GtkTextLayout *layout)
 505 {
 506   g_return_if_fail (GTK_IS_WIDGET (child));
 507   g_return_if_fail (layout == NULL || GTK_IS_TEXT_LAYOUT (layout));
 508
 509   _gtk_anchored_child_set_layout (child, layout);
 510 }
 511
 512 #define __GTK_TEXT_CHILD_C__
 513 #include "gtkaliasdef.c"