gtkselection.c 41.4 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1 2 3 4 5 6 7 8 9 10
/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
11
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
Elliot Lee's avatar
Elliot Lee committed
12 13 14
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
15 16 17
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
18 19 20 21 22 23 24 25 26 27 28 29 30
 */

/* This file implements most of the work of the ICCM selection protocol.
 * The code was written after an intensive study of the equivalent part
 * of John Ousterhout's Tk toolkit, and does many things in much the 
 * same way.
 *
 * The one thing in the ICCM that isn't fully supported here (or in Tk)
 * is side effects targets. For these to be handled properly, MULTIPLE
 * targets need to be done in the order specified. This cannot be
 * guaranteed with the way we do things, since if we are doing INCR
 * transfers, the order will depend on the timing of the requestor.
 *
31
 * By Owen Taylor <owt1@cornell.edu>	      8/16/97
Elliot Lee's avatar
Elliot Lee committed
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
 */

/* Terminology note: when not otherwise specified, the term "incr" below
 * refers to the _sending_ part of the INCR protocol. The receiving
 * portion is referred to just as "retrieval". (Terminology borrowed
 * from Tk, because there is no good opposite to "retrieval" in English.
 * "send" can't be made into a noun gracefully and we're already using
 * "emission" for something else ....)
 */

/* The MOTIF entry widget seems to ask for the TARGETS target, then
   (regardless of the reply) ask for the TEXT target. It's slightly
   possible though that it somehow thinks we are responding negatively
   to the TARGETS request, though I don't really think so ... */

47 48 49 50 51 52 53
/*
 * Modified by the GTK+ Team and others 1997-1999.  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/. 
 */

Elliot Lee's avatar
Elliot Lee committed
54
#include <stdarg.h>
55
#include <string.h>
56 57 58 59 60 61
#include "gdk.h"

#if defined (GDK_WINDOWING_X11)
#include "x11/gdkx.h"		/* For gdk_window_lookup() */
#elif defined (GDK_WINDOWING_WIN32)
#include "win32/gdkwin32.h"	/* For gdk_window_lookup() */
62 63
#elif defined (GDK_WINDOWING_NANOX)
#include "nanox/gdkprivate-nanox.h"	/* For gdk_window_lookup() */
64 65
#endif

Elliot Lee's avatar
Elliot Lee committed
66 67 68 69 70 71 72 73
#include "gtkmain.h"
#include "gtkselection.h"
#include "gtksignal.h"

/* #define DEBUG_SELECTION */

/* Maximum size of a sent chunk, in bytes. Also the default size of
   our buffers */
74
#ifdef GDK_WINDOWING_WIN32
75 76 77
/* No chunks on Win32 */
#define GTK_SELECTION_MAX_SIZE G_MAXINT
#else
Elliot Lee's avatar
Elliot Lee committed
78
#define GTK_SELECTION_MAX_SIZE 4000
79
#endif
Elliot Lee's avatar
Elliot Lee committed
80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101
enum {
  INCR,
  MULTIPLE,
  TARGETS,
  TIMESTAMP,
  LAST_ATOM
};

typedef struct _GtkSelectionInfo GtkSelectionInfo;
typedef struct _GtkIncrConversion GtkIncrConversion;
typedef struct _GtkIncrInfo GtkIncrInfo;
typedef struct _GtkRetrievalInfo GtkRetrievalInfo;

struct _GtkSelectionInfo
{
  GdkAtom    selection;
  GtkWidget *widget;		/* widget that owns selection */
  guint32    time;		/* time used to acquire selection */
};

struct _GtkIncrConversion 
{
102 103
  GdkAtom	    target;	/* Requested target */
  GdkAtom	    property;	/* Property to store in */
Elliot Lee's avatar
Elliot Lee committed
104
  GtkSelectionData  data;	/* The data being supplied */
105
  gint		    offset;	/* Current offset in sent selection.
Elliot Lee's avatar
Elliot Lee committed
106 107
				 *  -1 => All done
				 *  -2 => Only the final (empty) portion
108
				 *	  left to send */
Elliot Lee's avatar
Elliot Lee committed
109 110 111 112 113 114 115 116
};

struct _GtkIncrInfo
{
  GtkWidget *widget;		/* Selection owner */
  GdkWindow *requestor;		/* Requestor window - we create a GdkWindow
				   so we can receive events */
  GdkAtom    selection;		/* Selection we're sending */
117
  
Elliot Lee's avatar
Elliot Lee committed
118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
  GtkIncrConversion *conversions; /* Information about requested conversions -
				   * With MULTIPLE requests (benighted 1980's
				   * hardware idea), there can be more than
				   * one */
  gint num_conversions;
  gint num_incrs;		/* number of remaining INCR style transactions */
  guint32 idle_time;
};


struct _GtkRetrievalInfo
{
  GtkWidget *widget;
  GdkAtom selection;		/* Selection being retrieved. */
  GdkAtom target;		/* Form of selection that we requested */
  guint32 idle_time;		/* Number of seconds since we last heard
				   from selection owner */
  guchar   *buffer;		/* Buffer in which to accumulate results */
136
  gint	   offset;		/* Current offset in buffer, -1 indicates
Elliot Lee's avatar
Elliot Lee committed
137
				   not yet started */
138
  guint32 notify_time;		/* Timestamp from SelectionNotify */
Elliot Lee's avatar
Elliot Lee committed
139 140 141
};

/* Local Functions */
142 143 144 145
static void gtk_selection_init			 (void);
static gint gtk_selection_incr_timeout		 (GtkIncrInfo *info);
static gint gtk_selection_retrieval_timeout	 (GtkRetrievalInfo *info);
static void gtk_selection_retrieval_report	 (GtkRetrievalInfo *info,
Elliot Lee's avatar
Elliot Lee committed
146
						  GdkAtom type, gint format, 
147 148
						  guchar *buffer, gint length,
						  guint32 time);
149
static void gtk_selection_invoke_handler	 (GtkWidget	   *widget,
150 151
						  GtkSelectionData *data,
						  guint             time);
152
static void gtk_selection_default_handler	 (GtkWidget	  *widget,
Elliot Lee's avatar
Elliot Lee committed
153 154 155 156 157 158 159 160 161
						  GtkSelectionData *data);

/* Local Data */
static gint initialize = TRUE;
static GList *current_retrievals = NULL;
static GList *current_incrs = NULL;
static GList *current_selections = NULL;

static GdkAtom gtk_selection_atoms[LAST_ATOM];
Tim Janik's avatar
Tim Janik committed
162
static const char *gtk_selection_handler_key = "gtk-selection-handlers";
Elliot Lee's avatar
Elliot Lee committed
163

164 165 166 167 168 169 170 171 172
/****************
 * Target Lists *
 ****************/

/*
 * Target lists
 */

GtkTargetList *
173 174
gtk_target_list_new (const GtkTargetEntry *targets,
		     guint                 ntargets)
175 176 177 178 179 180 181 182 183 184 185 186 187 188
{
  GtkTargetList *result = g_new (GtkTargetList, 1);
  result->list = NULL;
  result->ref_count = 1;

  if (targets)
    gtk_target_list_add_table (result, targets, ntargets);
  
  return result;
}

void               
gtk_target_list_ref (GtkTargetList *list)
{
189 190
  g_return_if_fail (list != NULL);

191 192 193 194 195 196
  list->ref_count++;
}

void               
gtk_target_list_unref (GtkTargetList *list)
{
197 198 199
  g_return_if_fail (list != NULL);
  g_return_if_fail (list->ref_count > 0);

200 201 202 203 204 205
  list->ref_count--;
  if (list->ref_count == 0)
    {
      GList *tmp_list = list->list;
      while (tmp_list)
	{
Owen Taylor's avatar
Owen Taylor committed
206 207
	  GtkTargetPair *pair = tmp_list->data;
	  g_free (pair);
208 209 210

	  tmp_list = tmp_list->next;
	}
Owen Taylor's avatar
Owen Taylor committed
211 212
      
      g_list_free (list->list);
213
      g_free (list);
214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235
    }
}

void 
gtk_target_list_add (GtkTargetList *list,
		     GdkAtom            target,
		     guint              flags,
		     guint              info)
{
  GtkTargetPair *pair;

  g_return_if_fail (list != NULL);
  
  pair = g_new (GtkTargetPair, 1);
  pair->target = target;
  pair->flags = flags;
  pair->info = info;

  list->list = g_list_append (list->list, pair);
}

void               
236 237 238
gtk_target_list_add_table (GtkTargetList        *list,
			   const GtkTargetEntry *targets,
			   guint                 ntargets)
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269
{
  gint i;

  for (i=ntargets-1; i >= 0; i--)
    {
      GtkTargetPair *pair = g_new (GtkTargetPair, 1);
      pair->target = gdk_atom_intern (targets[i].target, FALSE);
      pair->flags = targets[i].flags;
      pair->info = targets[i].info;
      
      list->list = g_list_prepend (list->list, pair);
    }
}

void 
gtk_target_list_remove (GtkTargetList *list,
			GdkAtom            target)
{
  GList *tmp_list;

  g_return_if_fail (list != NULL);

  tmp_list = list->list;
  while (tmp_list)
    {
      GtkTargetPair *pair = tmp_list->data;
      
      if (pair->target == target)
	{
	  g_free (pair);

270
	  list->list = g_list_remove_link (list->list, tmp_list);
271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
	  g_list_free_1 (tmp_list);

	  return;
	}
      
      tmp_list = tmp_list->next;
    }
}

gboolean
gtk_target_list_find (GtkTargetList *list,
		      GdkAtom        target,
		      guint         *info)
{
  GList *tmp_list = list->list;
  while (tmp_list)
    {
      GtkTargetPair *pair = tmp_list->data;

      if (pair->target == target)
	{
	  *info = pair->info;
	  return TRUE;
	}
      tmp_list = tmp_list->next;
    }

  return FALSE;
}


Elliot Lee's avatar
Elliot Lee committed
302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319
/*************************************************************
 * gtk_selection_owner_set:
 *     Claim ownership of a selection.
 *   arguments:
 *     widget:		new selection owner
 *     selection:	which selection
 *     time:		time (use GDK_CURRENT_TIME only if necessary)
 *
 *   results:
 *************************************************************/

gint
gtk_selection_owner_set (GtkWidget *widget,
			 GdkAtom    selection,
			 guint32    time)
{
  GList *tmp_list;
  GtkWidget *old_owner;
320
  GtkSelectionInfo *selection_info = NULL;
Elliot Lee's avatar
Elliot Lee committed
321
  GdkWindow *window;
322
  
Elliot Lee's avatar
Elliot Lee committed
323 324 325 326 327 328 329 330 331
  if (widget == NULL)
    window = NULL;
  else
    {
      if (!GTK_WIDGET_REALIZED (widget))
	gtk_widget_realize (widget);
      
      window = widget->window;
    }
332
  
Elliot Lee's avatar
Elliot Lee committed
333 334 335 336 337 338 339 340 341 342
  tmp_list = current_selections;
  while (tmp_list)
    {
      selection_info = (GtkSelectionInfo *)tmp_list->data;
      
      if (selection_info->selection == selection)
	break;
      
      tmp_list = tmp_list->next;
    }
343
  
Elliot Lee's avatar
Elliot Lee committed
344 345 346 347 348
  if (tmp_list == NULL)
    selection_info = NULL;
  else
    if (selection_info->widget == widget)
      return TRUE;
349
  
Elliot Lee's avatar
Elliot Lee committed
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393
  if (gdk_selection_owner_set (window, selection, time, TRUE))
    {
      old_owner = NULL;
      
      if (widget == NULL)
	{
	  if (selection_info)
	    {
	      old_owner = selection_info->widget;
	      current_selections = g_list_remove_link (current_selections,
						       tmp_list);
	      g_list_free (tmp_list);
	      g_free (selection_info);
	    }
	}
      else
	{
	  if (selection_info == NULL)
	    {
	      selection_info = g_new (GtkSelectionInfo, 1);
	      selection_info->selection = selection;
	      selection_info->widget = widget;
	      selection_info->time = time;
	      current_selections = g_list_append (current_selections, 
						  selection_info);
	    }
	  else
	    {
	      old_owner = selection_info->widget;
	      selection_info->widget = widget;
	      selection_info->time = time;
	    }
	}
      /* If another widget in the application lost the selection,
       *  send it a GDK_SELECTION_CLEAR event, unless we're setting
       *  the owner to None, in which case an event will be sent */
      if (old_owner && (widget != NULL))
	{
	  GdkEventSelection event;
	  
	  event.type = GDK_SELECTION_CLEAR;
	  event.window = old_owner->window;
	  event.selection = selection;
	  event.time = time;
394
	  
395
	  gtk_widget_event (old_owner, (GdkEvent *) &event);
Elliot Lee's avatar
Elliot Lee committed
396 397 398 399 400 401 402 403
	}
      return TRUE;
    }
  else
    return FALSE;
}

/*************************************************************
404 405
 * gtk_selection_add_target
 *     Add specified target to list of supported targets
Elliot Lee's avatar
Elliot Lee committed
406 407
 *
 *   arguments:
408
 *     widget:	   The widget for which this target applies
Elliot Lee's avatar
Elliot Lee committed
409 410
 *     selection:
 *     target:
411
 *     info:       guint to pass to to the selection_get signal 
Elliot Lee's avatar
Elliot Lee committed
412 413 414 415
 *
 *   results:
 *************************************************************/

416
typedef struct _GtkSelectionTargetList GtkSelectionTargetList;
417

418 419 420 421 422 423 424 425
struct _GtkSelectionTargetList {
  GdkAtom selection;
  GtkTargetList *list;
};

static GtkTargetList *
gtk_selection_target_list_get (GtkWidget    *widget,
			       GdkAtom       selection)
Elliot Lee's avatar
Elliot Lee committed
426
{
427
  GtkSelectionTargetList *sellist;
Elliot Lee's avatar
Elliot Lee committed
428
  GList *tmp_list;
429 430 431
  GList *lists;

  lists = gtk_object_get_data (GTK_OBJECT (widget), gtk_selection_handler_key);
432
  
433
  tmp_list = lists;
Elliot Lee's avatar
Elliot Lee committed
434 435
  while (tmp_list)
    {
436 437 438
      sellist = tmp_list->data;
      if (sellist->selection == selection)
	return sellist->list;
Elliot Lee's avatar
Elliot Lee committed
439 440
      tmp_list = tmp_list->next;
    }
441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459

  sellist = g_new (GtkSelectionTargetList, 1);
  sellist->selection = selection;
  sellist->list = gtk_target_list_new (NULL, 0);

  lists = g_list_prepend (lists, sellist);
  gtk_object_set_data (GTK_OBJECT (widget), gtk_selection_handler_key, lists);

  return sellist->list;
}

static void
gtk_selection_target_list_remove (GtkWidget    *widget)
{
  GtkSelectionTargetList *sellist;
  GList *tmp_list;
  GList *lists;

  lists = gtk_object_get_data (GTK_OBJECT (widget), gtk_selection_handler_key);
460
  
461 462
  tmp_list = lists;
  while (tmp_list)
Elliot Lee's avatar
Elliot Lee committed
463
    {
464 465 466 467 468 469
      sellist = tmp_list->data;

      gtk_target_list_unref (sellist->list);

      g_free (sellist);
      tmp_list = tmp_list->next;
Elliot Lee's avatar
Elliot Lee committed
470
    }
471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490

  g_list_free (lists);
  gtk_object_set_data (GTK_OBJECT (widget), gtk_selection_handler_key, NULL);
}

void 
gtk_selection_add_target (GtkWidget	    *widget, 
			  GdkAtom	     selection,
			  GdkAtom	     target,
			  guint              info)
{
  GtkTargetList *list;

  g_return_if_fail (widget != NULL);

  list = gtk_selection_target_list_get (widget, selection);
  gtk_target_list_add (list, target, 0, info);
}

void 
491 492 493 494
gtk_selection_add_targets (GtkWidget            *widget, 
			   GdkAtom               selection,
			   const GtkTargetEntry *targets,
			   guint                 ntargets)
495 496 497 498 499
{
  GtkTargetList *list;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (targets != NULL);
Elliot Lee's avatar
Elliot Lee committed
500
  
501 502
  list = gtk_selection_target_list_get (widget, selection);
  gtk_target_list_add_table (list, targets, ntargets);
Elliot Lee's avatar
Elliot Lee committed
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521
}

/*************************************************************
 * gtk_selection_remove_all:
 *     Removes all handlers and unsets ownership of all 
 *     selections for a widget. Called when widget is being
 *     destroyed
 *     
 *   arguments:
 *     widget:	  The widget
 *   results:
 *************************************************************/

void
gtk_selection_remove_all (GtkWidget *widget)
{
  GList *tmp_list;
  GList *next;
  GtkSelectionInfo *selection_info;
522
  
Elliot Lee's avatar
Elliot Lee committed
523
  /* Remove pending requests/incrs for this widget */
524
  
Elliot Lee's avatar
Elliot Lee committed
525 526 527 528 529 530 531 532 533 534 535 536
  tmp_list = current_incrs;
  while (tmp_list)
    {
      next = tmp_list->next;
      if (((GtkIncrInfo *)tmp_list->data)->widget == widget)
	{
	  current_incrs = g_list_remove_link (current_incrs, tmp_list);
	  /* structure will be freed in timeout */
	  g_list_free (tmp_list);
	}
      tmp_list = next;
    }
537
  
Elliot Lee's avatar
Elliot Lee committed
538 539 540 541 542 543 544 545 546 547 548 549 550 551 552
  tmp_list = current_retrievals;
  while (tmp_list)
    {
      next = tmp_list->next;
      if (((GtkRetrievalInfo *)tmp_list->data)->widget == widget)
	{
	  current_retrievals = g_list_remove_link (current_retrievals, 
						   tmp_list);
	  /* structure will be freed in timeout */
	  g_list_free (tmp_list);
	}
      tmp_list = next;
    }
  
  /* Disclaim ownership of any selections */
553
  
Elliot Lee's avatar
Elliot Lee committed
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572
  tmp_list = current_selections;
  while (tmp_list)
    {
      next = tmp_list->next;
      selection_info = (GtkSelectionInfo *)tmp_list->data;
      
      if (selection_info->widget == widget)
	{	
	  gdk_selection_owner_set (NULL, 
				   selection_info->selection,
				   GDK_CURRENT_TIME, FALSE);
	  current_selections = g_list_remove_link (current_selections, 
						   tmp_list);
	  g_list_free (tmp_list);
	  g_free (selection_info);
	}
      
      tmp_list = next;
    }
573 574 575

  /* Remove all selection lists */
  gtk_selection_target_list_remove (widget);
Elliot Lee's avatar
Elliot Lee committed
576 577 578 579 580 581 582 583
}

/*************************************************************
 * gtk_selection_convert:
 *     Request the contents of a selection. When received, 
 *     a "selection_received" signal will be generated.
 *
 *   arguments:
584
 *     widget:	   The widget which acts as requestor
Elliot Lee's avatar
Elliot Lee committed
585
 *     selection:  Which selection to get
586 587 588
 *     target:	   Form of information desired (e.g., STRING)
 *     time:	   Time of request (usually of triggering event)
 *		   In emergency, you could use GDK_CURRENT_TIME
Elliot Lee's avatar
Elliot Lee committed
589 590 591 592 593 594 595 596 597
 *
 *   results:
 *     TRUE if requested succeeded. FALSE if we could not process
 *     request. (e.g., there was already a request in process for
 *     this widget). 
 *************************************************************/

gint
gtk_selection_convert (GtkWidget *widget, 
598 599 600
		       GdkAtom	  selection, 
		       GdkAtom	  target,
		       guint32	  time)
Elliot Lee's avatar
Elliot Lee committed
601 602 603 604
{
  GtkRetrievalInfo *info;
  GList *tmp_list;
  GdkWindow *owner_window;
605
  
Elliot Lee's avatar
Elliot Lee committed
606
  g_return_val_if_fail (widget != NULL, FALSE);
607
  
Elliot Lee's avatar
Elliot Lee committed
608 609 610 611 612
  if (initialize)
    gtk_selection_init ();
  
  if (!GTK_WIDGET_REALIZED (widget))
    gtk_widget_realize (widget);
613
  
Elliot Lee's avatar
Elliot Lee committed
614 615 616 617 618
  /* Check to see if there are already any retrievals in progress for
     this widget. If we changed GDK to use the selection for the 
     window property in which to store the retrieved information, then
     we could support multiple retrievals for different selections.
     This might be useful for DND. */
619
  
Elliot Lee's avatar
Elliot Lee committed
620 621 622 623 624 625 626 627
  tmp_list = current_retrievals;
  while (tmp_list)
    {
      info = (GtkRetrievalInfo *)tmp_list->data;
      if (info->widget == widget)
	return FALSE;
      tmp_list = tmp_list->next;
    }
628
  
Elliot Lee's avatar
Elliot Lee committed
629
  info = g_new (GtkRetrievalInfo, 1);
630
  
Elliot Lee's avatar
Elliot Lee committed
631 632 633 634 635
  info->widget = widget;
  info->selection = selection;
  info->target = target;
  info->buffer = NULL;
  info->offset = -1;
636
  
Elliot Lee's avatar
Elliot Lee committed
637 638
  /* Check if this process has current owner. If so, call handler
     procedure directly to avoid deadlocks with INCR. */
639
  
Elliot Lee's avatar
Elliot Lee committed
640 641 642 643 644 645
  owner_window = gdk_selection_owner_get (selection);
  
  if (owner_window != NULL)
    {
      GtkWidget *owner_widget;
      GtkSelectionData selection_data;
646
      
Elliot Lee's avatar
Elliot Lee committed
647 648 649 650
      selection_data.selection = selection;
      selection_data.target = target;
      selection_data.data = NULL;
      selection_data.length = -1;
651
      
Elliot Lee's avatar
Elliot Lee committed
652
      gdk_window_get_user_data (owner_window, (gpointer *)&owner_widget);
653
      
Elliot Lee's avatar
Elliot Lee committed
654 655
      if (owner_widget != NULL)
	{
656
	  gtk_selection_invoke_handler (owner_widget, 
657 658
					&selection_data,
					time);
659
	  
Elliot Lee's avatar
Elliot Lee committed
660 661 662 663
	  gtk_selection_retrieval_report (info,
					  selection_data.type, 
					  selection_data.format,
					  selection_data.data,
664 665
					  selection_data.length,
					  time);
666
	  
Elliot Lee's avatar
Elliot Lee committed
667 668 669 670 671 672 673 674
	  g_free (selection_data.data);
	  
	  g_free (info);
	  return TRUE;
	}
    }
  
  /* Otherwise, we need to go through X */
675
  
Elliot Lee's avatar
Elliot Lee committed
676 677 678
  current_retrievals = g_list_append (current_retrievals, info);
  gdk_selection_convert (widget->window, selection, target, time);
  gtk_timeout_add (1000, (GtkFunction) gtk_selection_retrieval_timeout, info);
679
  
Elliot Lee's avatar
Elliot Lee committed
680 681 682 683 684 685 686 687 688 689
  return TRUE;
}

/*************************************************************
 * gtk_selection_data_set:
 *     Store new data into a GtkSelectionData object. Should
 *     _only_ by called from a selection handler callback.
 *     Null terminates the stored data.
 *   arguments:
 *     type:	the type of selection data
690 691 692
 *     format:	format (number of bits in a unit)
 *     data:	pointer to the data (will be copied)
 *     length:	length of the data
Elliot Lee's avatar
Elliot Lee committed
693 694 695 696 697
 *   results:
 *************************************************************/

void 
gtk_selection_data_set (GtkSelectionData *selection_data,
698 699
			GdkAtom		  type,
			gint		  format,
700
			const guchar	 *data,
701
			gint		  length)
Elliot Lee's avatar
Elliot Lee committed
702 703 704
{
  if (selection_data->data)
    g_free (selection_data->data);
705
  
Elliot Lee's avatar
Elliot Lee committed
706 707
  selection_data->type = type;
  selection_data->format = format;
708
  
Elliot Lee's avatar
Elliot Lee committed
709 710 711 712 713 714 715
  if (data)
    {
      selection_data->data = g_new (guchar, length+1);
      memcpy (selection_data->data, data, length);
      selection_data->data[length] = 0;
    }
  else
716 717 718 719 720 721 722 723
    {
      g_return_if_fail (length <= 0);
      
      if (length < 0)
	selection_data->data = NULL;
      else
	selection_data->data = g_strdup("");
    }
724
  
Elliot Lee's avatar
Elliot Lee committed
725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
  selection_data->length = length;
}

/*************************************************************
 * gtk_selection_init:
 *     Initialize local variables
 *   arguments:
 *     
 *   results:
 *************************************************************/

static void
gtk_selection_init (void)
{
  gtk_selection_atoms[INCR] = gdk_atom_intern ("INCR", FALSE);
  gtk_selection_atoms[MULTIPLE] = gdk_atom_intern ("MULTIPLE", FALSE);
  gtk_selection_atoms[TIMESTAMP] = gdk_atom_intern ("TIMESTAMP", FALSE);
  gtk_selection_atoms[TARGETS] = gdk_atom_intern ("TARGETS", FALSE);
}

/*************************************************************
 * gtk_selection_clear:
 *     Handler for "selection_clear_event"
 *   arguments:
 *     widget:
 *     event:
 *   results:
 *************************************************************/

gint
gtk_selection_clear (GtkWidget *widget,
		     GdkEventSelection *event)
{
  /* FIXME: there can be a problem if we change the selection
     via gtk_selection_owner_set after another client claims 
     the selection, but before we get the notification event.
     Tk filters based on serial #'s, which aren't retained by
     GTK. Filtering based on time's will be inherently 
     somewhat unreliable. */
764
  
Elliot Lee's avatar
Elliot Lee committed
765
  GList *tmp_list;
766
  GtkSelectionInfo *selection_info = NULL;
767
  
Elliot Lee's avatar
Elliot Lee committed
768 769 770 771 772 773 774 775 776 777 778
  tmp_list = current_selections;
  while (tmp_list)
    {
      selection_info = (GtkSelectionInfo *)tmp_list->data;
      
      if ((selection_info->selection == event->selection) &&
	  (selection_info->widget == widget))
	break;
      
      tmp_list = tmp_list->next;
    }
779
  
780 781 782 783
  if (tmp_list)
    {
      if (selection_info->time > event->time)
	return FALSE;		/* return FALSE to indicate that
784 785
				 * the selection was out of date,
				 * and this clear should be ignored */
786 787 788 789 790 791 792 793
      else
	{
	  current_selections = g_list_remove_link (current_selections, tmp_list);
	  g_list_free (tmp_list);
	  g_free (selection_info);
	}
    }
  
Elliot Lee's avatar
Elliot Lee committed
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814
  return TRUE;
}


/*************************************************************
 * gtk_selection_request:
 *     Handler for "selection_request_event" 
 *   arguments:
 *     widget:
 *     event:
 *   results:
 *************************************************************/

gint
gtk_selection_request (GtkWidget *widget,
		       GdkEventSelection *event)
{
  GtkIncrInfo *info;
  GList *tmp_list;
  guchar *mult_atoms;
  int i;
815
  
816 817 818
  if (initialize)
    gtk_selection_init ();
  
Elliot Lee's avatar
Elliot Lee committed
819
  /* Check if we own selection */
820
  
Elliot Lee's avatar
Elliot Lee committed
821 822 823 824
  tmp_list = current_selections;
  while (tmp_list)
    {
      GtkSelectionInfo *selection_info = (GtkSelectionInfo *)tmp_list->data;
825
      
Elliot Lee's avatar
Elliot Lee committed
826 827 828
      if ((selection_info->selection == event->selection) &&
	  (selection_info->widget == widget))
	break;
829
      
Elliot Lee's avatar
Elliot Lee committed
830 831
      tmp_list = tmp_list->next;
    }
832
  
Elliot Lee's avatar
Elliot Lee committed
833 834 835 836
  if (tmp_list == NULL)
    return FALSE;
  
  info = g_new(GtkIncrInfo, 1);
837
  
Elliot Lee's avatar
Elliot Lee committed
838 839 840
  info->widget = widget;
  info->selection = event->selection;
  info->num_incrs = 0;
841
  
Elliot Lee's avatar
Elliot Lee committed
842
  /* Create GdkWindow structure for the requestor */
843
  
Elliot Lee's avatar
Elliot Lee committed
844 845 846 847 848
  info->requestor = gdk_window_lookup (event->requestor);
  if (!info->requestor)
    info->requestor = gdk_window_foreign_new (event->requestor);
  
  /* Determine conversions we need to perform */
849
  
Elliot Lee's avatar
Elliot Lee committed
850 851 852 853 854
  if (event->target == gtk_selection_atoms[MULTIPLE])
    {
      GdkAtom  type;
      gint     format;
      gint     length;
855
      
Elliot Lee's avatar
Elliot Lee committed
856
      mult_atoms = NULL;
857 858
      
      gdk_error_trap_push();
859
      if (!gdk_property_get (info->requestor, event->property, 0, /* AnyPropertyType */
Elliot Lee's avatar
Elliot Lee committed
860
			     0, GTK_SELECTION_MAX_SIZE, FALSE,
861
			     &type, &format, &length, &mult_atoms))
Elliot Lee's avatar
Elliot Lee committed
862 863 864 865 866 867 868
	{
	  gdk_selection_send_notify (event->requestor, event->selection,
				     event->target, GDK_NONE, event->time);
	  g_free (mult_atoms);
	  g_free (info);
	  return TRUE;
	}
869
      gdk_error_trap_pop();
870
      
Elliot Lee's avatar
Elliot Lee committed
871 872
      info->num_conversions = length / (2*sizeof (GdkAtom));
      info->conversions = g_new (GtkIncrConversion, info->num_conversions);
873
      
Elliot Lee's avatar
Elliot Lee committed
874 875 876 877 878 879 880 881 882 883 884 885 886 887
      for (i=0; i<info->num_conversions; i++)
	{
	  info->conversions[i].target = ((GdkAtom *)mult_atoms)[2*i];
	  info->conversions[i].property = ((GdkAtom *)mult_atoms)[2*i+1];
	}
    }
  else				/* only a single conversion */
    {
      info->conversions = g_new (GtkIncrConversion, 1);
      info->num_conversions = 1;
      info->conversions[0].target = event->target;
      info->conversions[0].property = event->property;
      mult_atoms = (guchar *)info->conversions;
    }
888
  
Elliot Lee's avatar
Elliot Lee committed
889 890 891 892 893 894
  /* Loop through conversions and determine which of these are big
     enough to require doing them via INCR */
  for (i=0; i<info->num_conversions; i++)
    {
      GtkSelectionData data;
      gint items;
895
      
Elliot Lee's avatar
Elliot Lee committed
896 897 898 899
      data.selection = event->selection;
      data.target = info->conversions[i].target;
      data.data = NULL;
      data.length = -1;
900
      
Elliot Lee's avatar
Elliot Lee committed
901
#ifdef DEBUG_SELECTION
902 903 904 905
      g_message ("Selection %ld, target %ld (%s) requested by 0x%x (property = %ld)",
		 event->selection, info->conversions[i].target,
		 gdk_atom_name(info->conversions[i].target),
		 event->requestor, event->property);
Elliot Lee's avatar
Elliot Lee committed
906
#endif
907
      
908
      gtk_selection_invoke_handler (widget, &data, event->time);
909
      
Elliot Lee's avatar
Elliot Lee committed
910 911 912 913 914 915
      if (data.length < 0)
	{
	  ((GdkAtom *)mult_atoms)[2*i+1] = GDK_NONE;
	  info->conversions[i].property = GDK_NONE;
	  continue;
	}
916
      
Tim Janik's avatar
GLib:  
Tim Janik committed
917
      g_return_val_if_fail ((data.format >= 8) && (data.format % 8 == 0), FALSE);
918
      
Elliot Lee's avatar
Elliot Lee committed
919
      items = (data.length + data.format/8 - 1) / (data.format/8);
920
      
Elliot Lee's avatar
Elliot Lee committed
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
      if (data.length > GTK_SELECTION_MAX_SIZE)
	{
	  /* Sending via INCR */
	  
	  info->conversions[i].offset = 0;
	  info->conversions[i].data = data;
	  info->num_incrs++;
	  
	  gdk_property_change (info->requestor, 
			       info->conversions[i].property,
			       gtk_selection_atoms[INCR],
			       8*sizeof (GdkAtom),
			       GDK_PROP_MODE_REPLACE,
			       (guchar *)&items, 1);
	}
      else
	{
	  info->conversions[i].offset = -1;
939
	  
Elliot Lee's avatar
Elliot Lee committed
940 941 942 943 944 945
	  gdk_property_change (info->requestor, 
			       info->conversions[i].property,
			       data.type,
			       data.format,
			       GDK_PROP_MODE_REPLACE,
			       data.data, items);
946
	  
Elliot Lee's avatar
Elliot Lee committed
947 948 949
	  g_free (data.data);
	}
    }
950
  
Elliot Lee's avatar
Elliot Lee committed
951 952
  /* If we have some INCR's, we need to send the rest of the data in
     a callback */
953
  
Elliot Lee's avatar
Elliot Lee committed
954 955 956 957
  if (info->num_incrs > 0)
    {
      /* FIXME: this could be dangerous if window doesn't still
	 exist */
958
      
Elliot Lee's avatar
Elliot Lee committed
959
#ifdef DEBUG_SELECTION
960
      g_message ("Starting INCR...");
Elliot Lee's avatar
Elliot Lee committed
961
#endif
962
      
Elliot Lee's avatar
Elliot Lee committed
963 964 965 966 967 968
      gdk_window_set_events (info->requestor,
			     gdk_window_get_events (info->requestor) |
			     GDK_PROPERTY_CHANGE_MASK);
      current_incrs = g_list_append (current_incrs, info);
      gtk_timeout_add (1000, (GtkFunction)gtk_selection_incr_timeout, info);
    }
969
  
Elliot Lee's avatar
Elliot Lee committed
970 971 972 973 974 975 976
  /* If it was a MULTIPLE request, set the property to indicate which
     conversions succeeded */
  if (event->target == gtk_selection_atoms[MULTIPLE])
    {
      gdk_property_change (info->requestor, event->property,
			   GDK_SELECTION_TYPE_ATOM, 8*sizeof(GdkAtom), 
			   GDK_PROP_MODE_REPLACE,
977
			   mult_atoms, 2*info->num_conversions);
Elliot Lee's avatar
Elliot Lee committed
978 979
      g_free (mult_atoms);
    }
980 981 982 983 984 985 986 987 988 989 990 991 992

  if (info->num_conversions == 1 &&
      info->conversions[0].property == GDK_NONE)
    {
      /* Reject the entire conversion */
      gdk_selection_send_notify (event->requestor, event->selection, 
				 event->target, GDK_NONE, event->time);
    }
  else
    {
      gdk_selection_send_notify (event->requestor, event->selection, 
				 event->target, event->property, event->time);
    }
993
  
Elliot Lee's avatar
Elliot Lee committed
994 995 996 997 998
  if (info->num_incrs == 0)
    {
      g_free (info->conversions);
      g_free (info);
    }
999
  
Elliot Lee's avatar
Elliot Lee committed
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
  return TRUE;
}

/*************************************************************
 * gtk_selection_incr_event:
 *     Called whenever an PropertyNotify event occurs for an 
 *     GdkWindow with user_data == NULL. These will be notifications
 *     that a window we are sending the selection to via the
 *     INCR protocol has deleted a property and is ready for
 *     more data.
 *
 *   arguments:
1012 1013
 *     window:	the requestor window
 *     event:	the property event structure
Elliot Lee's avatar
Elliot Lee committed
1014 1015 1016 1017 1018
 *
 *   results:
 *************************************************************/

gint
1019
gtk_selection_incr_event (GdkWindow	   *window,
Elliot Lee's avatar
Elliot Lee committed
1020 1021 1022
			  GdkEventProperty *event)
{
  GList *tmp_list;
1023
  GtkIncrInfo *info = NULL;
Elliot Lee's avatar
Elliot Lee committed
1024 1025
  gint num_bytes;
  guchar *buffer;
1026
  
Elliot Lee's avatar
Elliot Lee committed
1027 1028 1029 1030
  int i;
  
  if (event->state != GDK_PROPERTY_DELETE)
    return FALSE;
1031
  
Elliot Lee's avatar
Elliot Lee committed
1032
#ifdef DEBUG_SELECTION
1033
  g_message ("PropertyDelete, property %ld", event->atom);
Elliot Lee's avatar
Elliot Lee committed
1034
#endif
1035
  
Elliot Lee's avatar
Elliot Lee committed
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
  /* Now find the appropriate ongoing INCR */
  tmp_list = current_incrs;
  while (tmp_list)
    {
      info = (GtkIncrInfo *)tmp_list->data;
      if (info->requestor == event->window)
	break;
      
      tmp_list = tmp_list->next;
    }
1046
  
Elliot Lee's avatar
Elliot Lee committed
1047 1048
  if (tmp_list == NULL)
    return FALSE;
1049
  
Elliot Lee's avatar
Elliot Lee committed
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
  /* Find out which target this is for */
  for (i=0; i<info->num_conversions; i++)
    {
      if (info->conversions[i].property == event->atom &&
	  info->conversions[i].offset != -1)
	{
	  info->idle_time = 0;
	  
	  if (info->conversions[i].offset == -2) /* only the last 0-length
						    piece*/
	    {
	      num_bytes = 0;
	      buffer = NULL;
	    }
	  else
	    {
	      num_bytes = info->conversions[i].data.length -
		info->conversions[i].offset;
	      buffer = info->conversions[i].data.data + 
		info->conversions[i].offset;
1070
	      
Elliot Lee's avatar
Elliot Lee committed
1071 1072 1073 1074 1075 1076 1077 1078 1079
	      if (num_bytes > GTK_SELECTION_MAX_SIZE)
		{
		  num_bytes = GTK_SELECTION_MAX_SIZE;
		  info->conversions[i].offset += GTK_SELECTION_MAX_SIZE;
		}
	      else
		info->conversions[i].offset = -2;
	    }
#ifdef DEBUG_SELECTION
1080 1081 1082
	  g_message ("INCR: put %d bytes (offset = %d) into window 0x%lx , property %ld",
		     num_bytes, info->conversions[i].offset, 
		     GDK_WINDOW_XWINDOW(info->requestor), event->atom);
Elliot Lee's avatar
Elliot Lee committed
1083 1084 1085 1086 1087 1088 1089 1090
#endif
	  gdk_property_change (info->requestor, event->atom,
			       info->conversions[i].data.type,
			       info->conversions[i].data.format,
			       GDK_PROP_MODE_REPLACE,
			       buffer, 
			       (num_bytes + info->conversions[i].data.format/8 - 1) / 
			       (info->conversions[i].data.format/8));
1091
	  
Elliot Lee's avatar
Elliot Lee committed
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
	  if (info->conversions[i].offset == -2)
	    {
	      g_free (info->conversions[i].data.data);
	      info->conversions[i].data.data = NULL;
	    }
	  
	  if (num_bytes == 0)
	    {
	      info->num_incrs--;
	      info->conversions[i].offset = -1;
	    }
	}
      break;
    }
1106
  
Elliot Lee's avatar
Elliot Lee committed
1107
  /* Check if we're finished with all the targets */
1108
  
Elliot Lee's avatar
Elliot Lee committed
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
  if (info->num_incrs == 0)
    {
      current_incrs = g_list_remove_link (current_incrs, tmp_list);
      g_list_free (tmp_list);
      /* Let the timeout free it */
    }
  
  return TRUE;
}

/*************************************************************
 * gtk_selection_incr_timeout:
 *     Timeout callback for the sending portion of the INCR
 *     protocol
 *   arguments:
1124
 *     info:	Information about this incr
Elliot Lee's avatar
Elliot Lee committed
1125 1126 1127 1128 1129 1130 1131
 *   results:
 *************************************************************/

static gint
gtk_selection_incr_timeout (GtkIncrInfo *info)
{
  GList *tmp_list;
1132 1133
  gboolean retval;

1134
  GDK_THREADS_ENTER ();
Elliot Lee's avatar
Elliot Lee committed
1135 1136 1137
  
  /* Determine if retrieval has finished by checking if it still in
     list of pending retrievals */
1138
  
Elliot Lee's avatar
Elliot Lee committed
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
  tmp_list = current_incrs;
  while (tmp_list)
    {
      if (info == (GtkIncrInfo *)tmp_list->data)
	break;
      tmp_list = tmp_list->next;
    }
  
  /* If retrieval is finished */
  if (!tmp_list || info->idle_time >= 5)
    {
      if (tmp_list && info->idle_time >= 5)
	{
	  current_incrs = g_list_remove_link (current_incrs, tmp_list);
	  g_list_free (tmp_list);
	}
      
      g_free (info->conversions);
      /* FIXME: we should check if requestor window is still in use,
	 and if not, remove it? */
1159
      
Elliot Lee's avatar
Elliot Lee committed
1160 1161
      g_free (info);
      
1162
      retval =  FALSE;		/* remove timeout */
Elliot Lee's avatar
Elliot Lee committed
1163 1164 1165 1166 1167
    }
  else
    {
      info->idle_time++;
      
1168
      retval = TRUE;		/* timeout will happen again */
Elliot Lee's avatar
Elliot Lee committed
1169
    }
1170
  
1171
  GDK_THREADS_LEAVE ();
1172 1173

  return retval;
Elliot Lee's avatar
Elliot Lee committed
1174 1175 1176 1177 1178 1179 1180 1181
}

/*************************************************************
 * gtk_selection_notify:
 *     Handler for "selection_notify_event" signals on windows
 *     where a retrieval is currently in process. The selection
 *     owner has responded to our conversion request.
 *   arguments:
1182 1183 1184
 *     widget:		Widget getting signal
 *     event:		Selection event structure
 *     info:		Information about this retrieval
Elliot Lee's avatar
Elliot Lee committed
1185 1186 1187 1188 1189
 *   results:
 *     was event handled?
 *************************************************************/

gint
1190
gtk_selection_notify (GtkWidget	       *widget,
Elliot Lee's avatar
Elliot Lee committed
1191 1192 1193
		      GdkEventSelection *event)
{
  GList *tmp_list;
1194
  GtkRetrievalInfo *info = NULL;
1195
  guchar  *buffer = NULL;
Elliot Lee's avatar
Elliot Lee committed
1196 1197
  gint length;
  GdkAtom type;
1198
  gint	  format;
Elliot Lee's avatar
Elliot Lee committed
1199 1200
  
#ifdef DEBUG_SELECTION
1201 1202
  g_message ("Initial receipt of selection %ld, target %ld (property = %ld)",
	     event->selection, event->target, event->property);
Elliot Lee's avatar
Elliot Lee committed
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
#endif
  
  tmp_list = current_retrievals;
  while (tmp_list)
    {
      info = (GtkRetrievalInfo *)tmp_list->data;
      if (info->widget == widget && info->selection == event->selection)
	break;
      tmp_list = tmp_list->next;
    }
1213
  
Elliot Lee's avatar
Elliot Lee committed
1214 1215
  if (!tmp_list)		/* no retrieval in progress */
    return FALSE;
1216 1217 1218 1219 1220 1221

  if (event->property != GDK_NONE)
    length = gdk_selection_property_get (widget->window, &buffer, 
					 &type, &format);

  if (event->property == GDK_NONE || buffer == NULL)
Elliot Lee's avatar
Elliot Lee committed
1222 1223 1224 1225 1226
    {
      current_retrievals = g_list_remove_link (current_retrievals, tmp_list);
      g_list_free (tmp_list);
      /* structure will be freed in timeout */
      gtk_selection_retrieval_report (info,
1227
				      GDK_NONE, 0, NULL, -1, event->time);
1228
      
Elliot Lee's avatar
Elliot Lee committed
1229 1230 1231 1232 1233 1234 1235
      return TRUE;
    }
  
  if (type == gtk_selection_atoms[INCR])
    {
      /* The remainder of the selection will come through PropertyNotify
	 events */
1236 1237

      info->notify_time = event->time;
Elliot Lee's avatar
Elliot Lee committed
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
      info->idle_time = 0;
      info->offset = 0;		/* Mark as OK to proceed */
      gdk_window_set_events (widget->window,
			     gdk_window_get_events (widget->window)
			     | GDK_PROPERTY_CHANGE_MASK);
    }
  else
    {
      /* We don't delete the info structure - that will happen in timeout */
      current_retrievals = g_list_remove_link (current_retrievals, tmp_list);
      g_list_free (tmp_list);
1249
      
Elliot Lee's avatar
Elliot Lee committed
1250 1251 1252
      info->offset = length;
      gtk_selection_retrieval_report (info,
				      type, format, 
1253
				      buffer, length, event->time);
Elliot Lee's avatar
Elliot Lee committed
1254
    }
1255
  
Elliot Lee's avatar
Elliot Lee committed
1256
  gdk_property_delete (widget->window, event->property);
1257
  
Elliot Lee's avatar
Elliot Lee committed
1258
  g_free (buffer);
1259
  
Elliot Lee's avatar
Elliot Lee committed
1260 1261 1262 1263 1264 1265 1266 1267 1268
  return TRUE;
}

/*************************************************************
 * gtk_selection_property_notify:
 *     Handler for "property_notify_event" signals on windows
 *     where a retrieval is currently in process. The selection
 *     owner has added more data.
 *   arguments:
1269 1270 1271
 *     widget:		Widget getting signal
 *     event:		Property event structure
 *     info:		Information about this retrieval
Elliot Lee's avatar
Elliot Lee committed
1272 1273 1274 1275 1276
 *   results:
 *     was event handled?
 *************************************************************/

gint
1277
gtk_selection_property_notify (GtkWidget	*widget,
Elliot Lee's avatar
Elliot Lee committed
1278 1279 1280
			       GdkEventProperty *event)
{
  GList *tmp_list;
1281
  GtkRetrievalInfo *info = NULL;
Elliot Lee's avatar
Elliot Lee committed
1282 1283 1284
  guchar *new_buffer;
  int length;
  GdkAtom type;
1285
  gint	  format;
1286
  
1287 1288 1289
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

Elliot Lee's avatar
Elliot Lee committed
1290 1291 1292
  if ((event->state != GDK_PROPERTY_NEW_VALUE) ||  /* property was deleted */
      (event->atom != gdk_selection_property)) /* not the right property */
    return FALSE;
1293
  
Elliot Lee's avatar
Elliot Lee committed
1294
#ifdef DEBUG_SELECTION
1295 1296
  g_message ("PropertyNewValue, property %ld",
	     event->atom);
Elliot Lee's avatar
Elliot Lee committed
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
#endif
  
  tmp_list = current_retrievals;
  while (tmp_list)
    {
      info = (GtkRetrievalInfo *)tmp_list->data;
      if (info->widget == widget)
	break;
      tmp_list = tmp_list->next;
    }
1307
  
Elliot Lee's avatar
Elliot Lee committed
1308 1309
  if (!tmp_list)		/* No retrieval in progress */
    return FALSE;
1310
  
Elliot Lee's avatar
Elliot Lee committed
1311 1312 1313
  if (info->offset < 0)		/* We haven't got the SelectionNotify
				   for this retrieval yet */
    return FALSE;
1314
  
Elliot Lee's avatar
Elliot Lee committed
1315 1316 1317 1318 1319
  info->idle_time = 0;
  
  length = gdk_selection_property_get (widget->window, &new_buffer, 
				       &type, &format);
  gdk_property_delete (widget->window, event->atom);
1320
  
Elliot Lee's avatar
Elliot Lee committed
1321 1322 1323 1324
  /* We could do a lot better efficiency-wise by paying attention to
     what length was sent in the initial INCR transaction, instead of
     doing memory allocation at every step. But its only guaranteed to
     be a _lower bound_ (pretty useless!) */
1325
  
Elliot Lee's avatar
Elliot Lee committed
1326 1327 1328 1329 1330 1331 1332 1333
  if (length == 0 || type == GDK_NONE)		/* final zero length portion */
    {
      /* Info structure will be freed in timeout */
      current_retrievals = g_list_remove_link (current_retrievals, tmp_list);
      g_list_free (tmp_list);
      gtk_selection_retrieval_report (info,
				      type, format, 
				      (type == GDK_NONE) ?  NULL : info->buffer,
1334 1335
				      (type == GDK_NONE) ?  -1 : info->offset,
				      info->notify_time);
Elliot Lee's avatar
Elliot Lee committed
1336 1337 1338 1339 1340 1341
    }
  else				/* append on newly arrived data */
    {
      if (!info->buffer)
	{
#ifdef DEBUG_SELECTION
1342 1343
	  g_message ("Start - Adding %d bytes at offset 0",
		     length);
Elliot Lee's avatar
Elliot Lee committed
1344 1345 1346 1347 1348 1349
#endif
	  info->buffer = new_buffer;
	  info->offset = length;
	}
      else
	{
1350
	  
Elliot Lee's avatar
Elliot Lee committed
1351
#ifdef DEBUG_SELECTION
1352 1353
	  g_message ("Appending %d bytes at offset %d",
		     length,info->offset);
Elliot Lee's avatar
Elliot Lee committed
1354 1355 1356 1357 1358 1359 1360 1361
#endif
	  /* We copy length+1 bytes to preserve guaranteed null termination */
	  info->buffer = g_realloc (info->buffer, info->offset+length+1);
	  memcpy (info->buffer + info->offset, new_buffer, length+1);
	  info->offset += length;
	  g_free (new_buffer);
	}
    }
1362
  
Elliot Lee's avatar
Elliot Lee committed
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
  return TRUE;
}

/*************************************************************
 * gtk_selection_retrieval_timeout:
 *     Timeout callback while receiving a selection.
 *   arguments:
 *     info:	Information about this retrieval
 *   results:
 *************************************************************/

static gint
gtk_selection_retrieval_timeout (GtkRetrievalInfo *info)
{
  GList *tmp_list;
1378 1379
  gboolean retval;

1380
  GDK_THREADS_ENTER ();
Elliot Lee's avatar
Elliot Lee committed
1381 1382 1383
  
  /* Determine if retrieval has finished by checking if it still in
     list of pending retrievals */
1384
  
Elliot Lee's avatar
Elliot Lee committed
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
  tmp_list = current_retrievals;
  while (tmp_list)
    {
      if (info == (GtkRetrievalInfo *)tmp_list->data)
	break;
      tmp_list = tmp_list->next;
    }
  
  /* If retrieval is finished */
  if (!tmp_list || info->idle_time >= 5)
    {
      if (tmp_list && info->idle_time >= 5)
	{
	  current_retrievals = g_list_remove_link (current_retrievals, tmp_list);
	  g_list_free (tmp_list);
1400
	  gtk_selection_retrieval_report (info, GDK_NONE, 0, NULL, -1, GDK_CURRENT_TIME);
Elliot Lee's avatar
Elliot Lee committed
1401 1402 1403 1404 1405
	}
      
      g_free (info->buffer);
      g_free (info);
      
1406
      retval =  FALSE;		/* remove timeout */
Elliot Lee's avatar
Elliot Lee committed
1407 1408 1409 1410 1411
    }
  else
    {
      info->idle_time++;
      
1412
      retval =  TRUE;		/* timeout will happen again */
Elliot Lee's avatar
Elliot Lee committed
1413
    }
1414

1415
  GDK_THREADS_LEAVE ();
1416 1417

  return retval;
Elliot Lee's avatar
Elliot Lee committed
1418 1419 1420 1421 1422 1423
}

/*************************************************************
 * gtk_selection_retrieval_report:
 *     Emits a "selection_received" signal.
 *   arguments:
1424 1425
 *     info:	  information about the retrieval that completed
 *     buffer:	  buffer containing data (NULL => errror)
1426
 *     time:      timestamp for data in buffer
Elliot Lee's avatar
Elliot Lee committed
1427 1428 1429 1430 1431 1432
 *   results:
 *************************************************************/

static void
gtk_selection_retrieval_report (GtkRetrievalInfo *info,
				GdkAtom type, gint format, 
1433 1434
				guchar *buffer, gint length,
				guint32 time)
Elliot Lee's avatar
Elliot Lee committed
1435 1436
{
  GtkSelectionData data;
1437
  
Elliot Lee's avatar
Elliot Lee committed
1438 1439 1440 1441
  data.selection = info->selection;
  data.target = info->target;
  data.type = type;
  data.format = format;
1442
  
Elliot Lee's avatar
Elliot Lee committed
1443 1444
  data.length = length;
  data.data = buffer;
1445
  
Elliot Lee's avatar
Elliot Lee committed
1446
  gtk_signal_emit_by_name (GTK_OBJECT(info->widget),
1447 1448
			   "selection_received", 
			   &data, time);
Elliot Lee's avatar
Elliot Lee committed
1449 1450 1451
}

/*************************************************************
1452 1453 1454 1455 1456
 * gtk_selection_invoke_handler:
 *     Finds and invokes handler for specified
 *     widget/selection/target combination, calls 
 *     gtk_selection_default_handler if none exists.
 *
Elliot Lee's avatar
Elliot Lee committed
1457
 *   arguments:
1458 1459
 *     widget:	    selection owner
 *     data:	    selection data [INOUT]
1460
 *     time:        time from requeset
1461
 *     
Elliot Lee's avatar
Elliot Lee committed
1462
 *   results:
1463
 *     Number of bytes written to buffer, -1 if error
Elliot Lee's avatar
Elliot Lee committed
1464 1465
 *************************************************************/

1466
static void
1467
gtk_selection_invoke_handler (GtkWidget	       *widget,
1468 1469
			      GtkSelectionData *data,
			      guint             time)
Elliot Lee's avatar
Elliot Lee committed
1470
{
1471 1472
  GtkTargetList *target_list;
  guint info;
1473
  
1474

1475
  g_return_if_fail (widget != NULL);
1476 1477 1478 1479

  target_list = gtk_selection_target_list_get (widget, data->selection);
  if (target_list && 
      gtk_target_list_find (target_list, data->target, &info))
Elliot Lee's avatar
Elliot Lee committed
1480
    {
1481 1482 1483 1484
      gtk_signal_emit_by_name (GTK_OBJECT (widget), 
			       "selection_get",
			       data,
			       info, time);
Elliot Lee's avatar
Elliot Lee committed
1485
    }
1486
  else
1487
    gtk_selection_default_handler (widget, data);
Elliot Lee's avatar
Elliot Lee committed
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
}

/*************************************************************
 * gtk_selection_default_handler:
 *     Handles some default targets that exist for any widget
 *     If it can't fit results into buffer, returns -1. This
 *     won't happen in any conceivable case, since it would
 *     require 1000 selection targets!
 *
 *   arguments:
1498 1499
 *     widget:	    selection owner
 *     data:	    selection data [INOUT]
1500
 *
Elliot Lee's avatar
Elliot Lee committed
1501 1502 1503
 *************************************************************/

static void
1504
gtk_selection_default_handler (GtkWidget	*widget,
Elliot Lee's avatar
Elliot Lee committed
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
			       GtkSelectionData *data)
{
  if (data->target == gtk_selection_atoms[TIMESTAMP])
    {
      /* Time which was used to obtain selection */
      GList *tmp_list;
      GtkSelectionInfo *selection_info;
      
      tmp_list = current_selections;
      while (tmp_list)
	{
	  selection_info = (GtkSelectionInfo *)tmp_list->data;
	  if ((selection_info->widget == widget) &&
	      (selection_info->selection == data->selection))
	    {
	      gtk_selection_data_set (data,
				      GDK_SELECTION_TYPE_INTEGER,
				      sizeof (guint32)*8,
				      (guchar *)&selection_info->time,
				      sizeof (guint32));
	      return;
	    }
1527
	  
Elliot Lee's avatar
Elliot Lee committed
1528 1529
	  tmp_list = tmp_list->next;
	}
1530
      
Elliot Lee's avatar
Elliot Lee committed
1531 1532 1533 1534 1535 1536
      data->length = -1;
    }
  else if (data->target == gtk_selection_atoms[TARGETS])
    {
      /* List of all targets supported for this widget/selection pair */
      GdkAtom *p;
1537
      guint count;
Elliot Lee's avatar
Elliot Lee committed
1538
      GList *tmp_list;
1539 1540
      GtkTargetList *target_list;
      GtkTargetPair *pair;
1541
      
1542 1543
      target_list = gtk_selection_target_list_get (widget,
						   data->selection);
1544
      count = g_list_length (target_list->list) + 3;
1545
      
Elliot Lee's avatar
Elliot Lee committed
1546 1547
      data->type = GDK_SELECTION_TYPE_ATOM;
      data->format = 8*sizeof (GdkAtom);
1548
      data->length = count * sizeof (GdkAtom);
1549
      
Elliot Lee's avatar
Elliot Lee committed
1550 1551
      p = g_new (GdkAtom, count);
      data->data = (guchar *)p;
1552
      
Elliot Lee's avatar
Elliot Lee committed
1553 1554 1555
      *p++ = gtk_selection_atoms[TIMESTAMP];
      *p++ = gtk_selection_atoms[TARGETS];
      *p++ = gtk_selection_atoms[MULTIPLE];
1556
      
1557
      tmp_list = target_list->list;
Elliot Lee's avatar
Elliot Lee committed
1558 1559
      while (tmp_list)
	{
1560 1561
	  pair = (GtkTargetPair *)tmp_list->data;
	  *p++ = pair->target;
1562
	  
Elliot Lee's avatar
Elliot Lee committed
1563 1564 1565 1566 1567 1568 1569 1570
	  tmp_list = tmp_list->next;
	}
    }
  else
    {
      data->length = -1;
    }
}
1571 1572 1573 1574 1575 1576


GtkSelectioData*
gtk_selection_data_copy (GtkSelectionData *data)
{
  GtkSelectionData *new_data;
1577
  
1578
  g_return_val_if_fail (data != NULL, NULL);
1579