gdkdnd-x11.c 84.6 KB
Newer Older
1
/* GDK - The GIMP Drawing Kit
2
 * Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
3 4
 *
 * This library is free software; you can redistribute it and/or
5
 * modify it under the terms of the GNU Lesser General Public
6 7 8 9 10 11
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12
 * Lesser General Public License for more details.
13
 *
14
 * You should have received a copy of the GNU Lesser General Public
15 16 17 18
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
19 20

/*
21
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
22 23 24 25 26
 * 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/. 
 */

27 28 29
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <string.h>
Owen Taylor's avatar
Started  
Owen Taylor committed
30 31 32 33

#include "gdk.h"          /* For gdk_flush() */
#include "gdkdnd.h"
#include "gdkproperty.h"
34 35
#include "gdkinternals.h"
#include "gdkprivate-x11.h"
36

37
typedef struct _GdkDragContextPrivateX11 GdkDragContextPrivateX11;
38

39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
typedef enum {
  GDK_DRAG_STATUS_DRAG,
  GDK_DRAG_STATUS_MOTION_WAIT,
  GDK_DRAG_STATUS_ACTION_WAIT,
  GDK_DRAG_STATUS_DROP
} GtkDragStatus;

typedef struct {
  guint32 xid;
  gint x, y, width, height;
  gboolean mapped;
} GdkCacheChild;

typedef struct {
  GList *children;
  GHashTable *child_hash;
  guint old_event_mask;
} GdkWindowCache;

/* Structure that holds information about a drag in progress.
 * this is used on both source and destination sides.
 */
61
struct _GdkDragContextPrivateX11 {
62 63
  GdkDragContext context;

64 65
  Atom motif_selection;
  Atom xdnd_selection;
66 67 68 69
  guint   ref_count;

  guint16 last_x;		/* Coordinates from last event */
  guint16 last_y;
70 71 72
  GdkDragAction old_action;	  /* The last action we sent to the source */
  GdkDragAction old_actions;	  /* The last actions we sent to the source */
  GdkDragAction xdnd_actions;     /* What is currently set in XdndActionList */
73

74 75
  Window dest_xid;              /* The last window we looked up */
  Window drop_xid;            /* The (non-proxied) window that is receiving drops */
76
  guint xdnd_targets_set : 1;   /* Whether we've already set XdndTypeList */
77
  guint xdnd_actions_set : 1;   /* Whether we've already set XdndActionList */
78
  guint xdnd_have_actions : 1; /* Whether an XdndActionList was provided */
79 80 81 82 83 84
  guint motif_targets_set : 1;  /* Whether we've already set motif initiator info */
  guint drag_status : 4;	/* current status of drag */

  GdkWindowCache *window_cache;
};

85 86
#define PRIVATE_DATA(context) ((GdkDragContextPrivateX11 *) GDK_DRAG_CONTEXT (context)->windowing_data)

87
static GdkDragContext *current_dest_drag = NULL;
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121

/* Forward declarations */

static void gdk_window_cache_destroy (GdkWindowCache *cache);

static void     motif_read_target_table (void);
static GdkFilterReturn motif_dnd_filter (GdkXEvent *xev,
					 GdkEvent  *event,
					 gpointer   data);

static GdkFilterReturn xdnd_enter_filter (GdkXEvent *xev,
					  GdkEvent  *event,
					  gpointer   data);

static GdkFilterReturn xdnd_leave_filter (GdkXEvent *xev,
					  GdkEvent  *event,
					  gpointer   data);

static GdkFilterReturn xdnd_position_filter (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);

static GdkFilterReturn xdnd_status_filter (GdkXEvent *xev,
					   GdkEvent  *event,
					   gpointer   data);

static GdkFilterReturn xdnd_finished_filter (GdkXEvent *xev,
					    GdkEvent  *event,
					    gpointer   data);

static GdkFilterReturn xdnd_drop_filter (GdkXEvent *xev,
					 GdkEvent  *event,
					 gpointer   data);

122 123 124 125
static void   xdnd_manage_source_filter (GdkDragContext *context,
					 GdkWindow      *window,
					 gboolean        add_filter);

126 127 128
static void gdk_drag_context_init       (GdkDragContext      *dragcontext);
static void gdk_drag_context_class_init (GdkDragContextClass *klass);
static void gdk_drag_context_finalize   (GObject              *object);
129

130
static gpointer parent_class = NULL;
131 132
static GList *contexts;

133 134
GType
gdk_drag_context_get_type (void)
135
{
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
  static GType object_type = 0;

  if (!object_type)
    {
      static const GTypeInfo object_info =
      {
        sizeof (GdkDragContextClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gdk_drag_context_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GdkDragContext),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gdk_drag_context_init,
      };
      
      object_type = g_type_register_static (G_TYPE_OBJECT,
                                            "GdkDragContext",
155
                                            &object_info, 0);
156 157 158 159
    }
  
  return object_type;
}
160

161 162 163 164
static void
gdk_drag_context_init (GdkDragContext *dragcontext)
{
  GdkDragContextPrivateX11 *private;
165

166
  private = g_new0 (GdkDragContextPrivateX11, 1);
167

168
  dragcontext->windowing_data = private;
169

170
  contexts = g_list_prepend (contexts, dragcontext);
171 172
}

173 174
static void
gdk_drag_context_class_init (GdkDragContextClass *klass)
175
{
176 177 178
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);
Jeff Garzik's avatar
Jeff Garzik committed
179

180
  object_class->finalize = gdk_drag_context_finalize;
181 182
}

183 184
static void
gdk_drag_context_finalize (GObject *object)
185
{
186 187
  GdkDragContext *context = GDK_DRAG_CONTEXT (object);
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
188
  
189 190 191
  g_list_free (context->targets);

  if (context->source_window)
192
    {
193 194 195
      if ((context->protocol == GDK_DRAG_PROTO_XDND) &&
          !context->is_source)
        xdnd_manage_source_filter (context, context->source_window, FALSE);
196
      
197 198 199 200 201 202 203 204 205 206
      gdk_window_unref (context->source_window);
    }
  
  if (context->dest_window)
    gdk_window_unref (context->dest_window);
  
  if (private->window_cache)
    gdk_window_cache_destroy (private->window_cache);
  
  contexts = g_list_remove (contexts, context);
207

208 209 210 211
  g_free (private);
  
  G_OBJECT_CLASS (parent_class)->finalize (object);
}
212

213 214 215 216 217
/* Drag Contexts */

GdkDragContext *
gdk_drag_context_new        (void)
{
218
  return g_object_new (gdk_drag_context_get_type (), NULL);
219 220 221 222 223 224
}

void            
gdk_drag_context_ref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
225

226 227
  g_object_ref (G_OBJECT (context));
}
228

229 230 231 232
void            
gdk_drag_context_unref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
233

234
  g_object_unref (G_OBJECT (context));
235 236 237 238 239 240 241 242
}

static GdkDragContext *
gdk_drag_context_find (gboolean is_source,
		       Window   source_xid,
		       Window   dest_xid)
{
  GList *tmp_list = contexts;
Jeff Garzik's avatar
Jeff Garzik committed
243
  GdkDragContext *context;
244
  GdkDragContextPrivateX11 *private;
245
  Window context_dest_xid;
246 247 248

  while (tmp_list)
    {
Jeff Garzik's avatar
Jeff Garzik committed
249
      context = (GdkDragContext *)tmp_list->data;
250
      private = PRIVATE_DATA (context);
251 252

      context_dest_xid = context->dest_window ? 
253 254 255 256
                            (private->drop_xid ?
                              private->drop_xid :
                              GDK_DRAWABLE_XID (context->dest_window)) :
	                     None;
257 258 259

      if ((!context->is_source == !is_source) &&
	  ((source_xid == None) || (context->source_window &&
260
	    (GDK_DRAWABLE_XID (context->source_window) == source_xid))) &&
261
	  ((dest_xid == None) || (context_dest_xid == dest_xid)))
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333
	return context;
      
      tmp_list = tmp_list->next;
    }
  
  return NULL;
}

/* Utility functions */

static void
gdk_window_cache_add (GdkWindowCache *cache,
		      guint32 xid,
		      gint x, gint y, gint width, gint height, 
		      gboolean mapped)
{
  GdkCacheChild *child = g_new (GdkCacheChild, 1);

  child->xid = xid;
  child->x = x;
  child->y = y;
  child->width = width;
  child->height = height;
  child->mapped = mapped;

  cache->children = g_list_prepend (cache->children, child);
  g_hash_table_insert (cache->child_hash, GUINT_TO_POINTER (xid), 
		       cache->children);
}

static GdkFilterReturn
gdk_window_cache_filter (GdkXEvent *xev,
			 GdkEvent  *event,
			 gpointer   data)
{
  XEvent *xevent = (XEvent *)xev;
  GdkWindowCache *cache = data;

  switch (xevent->type)
    {
    case CirculateNotify:
      break;
    case ConfigureNotify:
      {
	XConfigureEvent *xce = &xevent->xconfigure;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xce->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->x = xce->x; 
	    child->y = xce->y;
	    child->width = xce->width; 
	    child->height = xce->height;
	    if (xce->above == None && (node->next))
	      {
		GList *last = g_list_last (cache->children);
		cache->children = g_list_remove_link (cache->children, node);
		last->next = node;
		node->next = NULL;
		node->prev = last;
	      }
	    else
	      {
		GList *above_node = g_hash_table_lookup (cache->child_hash, 
							 GUINT_TO_POINTER (xce->above));
		if (above_node && node->prev != above_node)
		  {
		    cache->children = g_list_remove_link (cache->children, node);
		    node->next = above_node->next;
334 335
		    if (node->next)
		      node->next->prev = node;
336 337 338 339 340 341 342 343 344 345
		    node->prev = above_node;
		    above_node->next = node;
		  }
	      }
	  }
	break;
      }
    case CreateNotify:
      {
	XCreateWindowEvent *xcwe = &xevent->xcreatewindow;
346

347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414
	if (!g_hash_table_lookup (cache->child_hash, 
				  GUINT_TO_POINTER (xcwe->window))) 
	  gdk_window_cache_add (cache, xcwe->window, 
				xcwe->x, xcwe->y, xcwe->width, xcwe->height,
				FALSE);
	break;
      }
    case DestroyNotify:
      {
	XDestroyWindowEvent *xdwe = &xevent->xdestroywindow;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xdwe->window));
	if (node) 
	  {
	    g_hash_table_remove (cache->child_hash,
				 GUINT_TO_POINTER (xdwe->window));
	    cache->children = g_list_remove_link (cache->children, node);
	    g_free (node->data);
	    g_list_free_1 (node);
	  }
	break;
      }
    case MapNotify:
      {
	XMapEvent *xme = &xevent->xmap;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xme->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->mapped = TRUE;
	  }
	break;
      }
    case ReparentNotify:
      break;
    case UnmapNotify:
      {
	XMapEvent *xume = &xevent->xmap;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xume->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->mapped = FALSE;
	  }
	break;
      }
    default:
      return GDK_FILTER_CONTINUE;
    }
  return GDK_FILTER_REMOVE;
}

static GdkWindowCache *
gdk_window_cache_new (void)
{
  XWindowAttributes xwa;
  Window root, parent, *children;
  unsigned int nchildren;
  int i;
  
415
  gint old_warnings = _gdk_error_warnings;
416 417 418 419 420 421
  
  GdkWindowCache *result = g_new (GdkWindowCache, 1);

  result->children = NULL;
  result->child_hash = g_hash_table_new (g_direct_hash, NULL);

422
  XGetWindowAttributes (gdk_display, _gdk_root_window, &xwa);
423
  result->old_event_mask = xwa.your_event_mask;
424
  XSelectInput (gdk_display, _gdk_root_window,
425
		result->old_event_mask | SubstructureNotifyMask);
426
  gdk_window_add_filter (_gdk_parent_root, 
427 428
			 gdk_window_cache_filter, result);
  
429 430
  _gdk_error_code = 0;
  _gdk_error_warnings = 0;
431

432
  if (XQueryTree(gdk_display, _gdk_root_window, 
433 434 435 436 437 438 439 440 441 442 443
		 &root, &parent, &children, &nchildren) == 0)
    return result;
  
  for (i = 0; i < nchildren ; i++)
    {
      XGetWindowAttributes (gdk_display, children[i], &xwa);

      gdk_window_cache_add (result, children[i],
			    xwa.x, xwa.y, xwa.width, xwa.height,
			    xwa.map_state != IsUnmapped);

444 445
      if (_gdk_error_code)
	_gdk_error_code = 0;
446 447 448 449 450 451 452 453 454 455
      else
	{
	  gdk_window_cache_add (result, children[i],
				xwa.x, xwa.y, xwa.width, xwa.height,
				(xwa.map_state != IsUnmapped));
	}
    }

  XFree (children);

456
  _gdk_error_warnings = old_warnings;
457 458 459 460 461 462 463

  return result;
}

static void
gdk_window_cache_destroy (GdkWindowCache *cache)
{
464 465
  XSelectInput (gdk_display, _gdk_root_window, cache->old_event_mask);
  gdk_window_remove_filter (_gdk_parent_root, 
466 467 468 469 470
			    gdk_window_cache_filter, cache);

  g_list_foreach (cache->children, (GFunc)g_free, NULL);
  g_list_free (cache->children);
  g_hash_table_destroy (cache->child_hash);
471 472

  g_free (cache);
473 474 475 476
}

static Window
get_client_window_at_coords_recurse (Window  win,
477 478
				     gint    x,
				     gint    y)
479
{
480 481 482 483
  Window root, tmp_parent, *children;
  unsigned int nchildren;
  int i;
  Window child = None;
484 485 486 487 488 489 490 491
  Atom type = None;
  int format;
  unsigned long nitems, after;
  unsigned char *data;
  
  static Atom wm_state_atom = None;

  if (!wm_state_atom)
492
    wm_state_atom = gdk_x11_get_xatom_by_name ("WM_STATE");
493 494 495 496 497
    
  XGetWindowProperty (gdk_display, win, 
		      wm_state_atom, 0, 0, False, AnyPropertyType,
		      &type, &format, &nitems, &after, &data);
  
498
  if (_gdk_error_code)
499
    {
500
      _gdk_error_code = 0;
501

502 503 504 505 506 507 508 509 510
      return None;
    }

  if (type != None)
    {
      XFree (data);
      return win;
    }

511 512
#if 0
  /* This is beautiful! Damn Enlightenment and click-to-focus */
513
  XTranslateCoordinates (gdk_display, _gdk_root_window, win,
514 515
			 x_root, y_root, &dest_x, &dest_y, &child);

516
  if (_gdk_error_code)
517
    {
518
      _gdk_error_code = 0;
519

520 521
      return None;
    }
522 523 524 525 526 527
  
#else
  if (XQueryTree(gdk_display, win,
		 &root, &tmp_parent, &children, &nchildren) == 0)
    return 0;

528
  if (!_gdk_error_code)
529 530 531 532 533 534 535
    {
      for (i = nchildren - 1; (i >= 0) && (child == None); i--)
	{
	  XWindowAttributes xwa;
	  
	  XGetWindowAttributes (gdk_display, children[i], &xwa);
	  
536 537
	  if (_gdk_error_code)
	    _gdk_error_code = 0;
538 539 540 541 542 543 544 545 546 547 548 549 550
	  else if ((xwa.map_state == IsViewable) && (xwa.class == InputOutput) &&
		   (x >= xwa.x) && (x < xwa.x + (gint)xwa.width) &&
		   (y >= xwa.y) && (y < xwa.y + (gint)xwa.height))
	    {
	      x -= xwa.x;
	      y -= xwa.y;
	      child = children[i];
	    }
	}
      
      XFree (children);
    }
  else
551
    _gdk_error_code = 0;
552
#endif  
553 554

  if (child)
555
    return get_client_window_at_coords_recurse (child, x, y);
556 557 558 559
  else
    return None;
}

Jeff Garzik's avatar
Jeff Garzik committed
560
static Window 
561
get_client_window_at_coords (GdkWindowCache *cache,
562 563 564
			     Window          ignore,
			     gint            x_root,
			     gint            y_root)
565 566 567 568
{
  GList *tmp_list;
  Window retval = None;

569
  gint old_warnings = _gdk_error_warnings;
570
  
571 572
  _gdk_error_code = 0;
  _gdk_error_warnings = 0;
573 574 575 576 577 578 579 580 581 582 583 584 585

  tmp_list = cache->children;

  while (tmp_list && !retval)
    {
      GdkCacheChild *child = tmp_list->data;

      if ((child->xid != ignore) && (child->mapped))
	{
	  if ((x_root >= child->x) && (x_root < child->x + child->width) &&
	      (y_root >= child->y) && (y_root < child->y + child->height))
	    {
	      retval = get_client_window_at_coords_recurse (child->xid,
586 587
							    x_root - child->x, 
							    y_root - child->y);
588 589 590 591 592 593 594 595
	      if (!retval)
		retval = child->xid;
	    }
	  
	}
      tmp_list = tmp_list->next;
    }

596
  _gdk_error_warnings = old_warnings;
597 598 599
  if (retval)
    return retval;
  else
600
    return _gdk_root_window;
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618
}

#if 0
static Window
get_client_window_at_coords_recurse (Window  win,
				     gint    x_root,
				     gint    y_root)
{
  Window child;
  Atom type = None;
  int format;
  unsigned long nitems, after;
  unsigned char *data;
  int dest_x, dest_y;
  
  static Atom wm_state_atom = None;

  if (!wm_state_atom)
619
    wm_state_atom = gdk_x11_get_xatom_by_name ("WM_STATE");
620 621 622 623 624
    
  XGetWindowProperty (gdk_display, win, 
		      wm_state_atom, 0, 0, False, AnyPropertyType,
		      &type, &format, &nitems, &after, &data);
  
625
  if (_gdk_error_code)
626
    {
627
      _gdk_error_code = 0;
628

629 630 631 632 633 634 635 636 637
      return None;
    }

  if (type != None)
    {
      XFree (data);
      return win;
    }

638
  XTranslateCoordinates (gdk_display, _gdk_root_window, win,
639 640
			 x_root, y_root, &dest_x, &dest_y, &child);

641
  if (_gdk_error_code)
642
    {
643
      _gdk_error_code = 0;
644

645 646 647 648 649 650 651 652 653
      return None;
    }

  if (child)
    return get_client_window_at_coords_recurse (child, x_root, y_root);
  else
    return None;
}

Jeff Garzik's avatar
Jeff Garzik committed
654
static Window 
655 656 657 658 659 660 661 662 663
get_client_window_at_coords (Window  ignore,
			     gint    x_root,
			     gint    y_root)
{
  Window root, parent, *children;
  unsigned int nchildren;
  int i;
  Window retval = None;
  
664
  gint old_warnings = _gdk_error_warnings;
665
  
666 667
  _gdk_error_code = 0;
  _gdk_error_warnings = 0;
668

669
  if (XQueryTree(gdk_display, _gdk_root_window, 
670 671
		 &root, &parent, &children, &nchildren) == 0)
    return 0;
672

673 674 675 676 677 678 679 680
  for (i = nchildren - 1; (i >= 0) && (retval == None); i--)
    {
      if (children[i] != ignore)
	{
	  XWindowAttributes xwa;

	  XGetWindowAttributes (gdk_display, children[i], &xwa);

681 682
	  if (_gdk_error_code)
	    _gdk_error_code = 0;
683 684 685 686 687 688 689 690 691 692 693 694 695 696
	  else if ((xwa.map_state == IsViewable) &&
		   (x_root >= xwa.x) && (x_root < xwa.x + (gint)xwa.width) &&
		   (y_root >= xwa.y) && (y_root < xwa.y + (gint)xwa.height))
	    {
	      retval = get_client_window_at_coords_recurse (children[i],
							    x_root, y_root);
	      if (!retval)
		retval = children[i];
	    }
	}
    }

  XFree (children);

697
  _gdk_error_warnings = old_warnings;
698 699 700
  if (retval)
    return retval;
  else
701
    return _gdk_root_window;
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
}
#endif

/*************************************************************
 ***************************** MOTIF *************************
 *************************************************************/

/* values used in the message type for Motif DND */
enum {
    XmTOP_LEVEL_ENTER,
    XmTOP_LEVEL_LEAVE,
    XmDRAG_MOTION,
    XmDROP_SITE_ENTER,
    XmDROP_SITE_LEAVE,
    XmDROP_START,
    XmDROP_FINISH,
    XmDRAG_DROP_FINISH,
    XmOPERATION_CHANGED
};

/* Values used to specify type of protocol to use */
enum {
    XmDRAG_NONE,
    XmDRAG_DROP_ONLY,
    XmDRAG_PREFER_PREREGISTER,
    XmDRAG_PREREGISTER,
    XmDRAG_PREFER_DYNAMIC,
    XmDRAG_DYNAMIC,
    XmDRAG_PREFER_RECEIVER
};

/* Operation codes */
enum {
  XmDROP_NOOP,
  XmDROP_MOVE = 0x01,
  XmDROP_COPY = 0x02,
  XmDROP_LINK = 0x04
};

/* Drop site status */
enum {
  XmNO_DROP_SITE = 0x01,
  XmDROP_SITE_INVALID = 0x02,
  XmDROP_SITE_VALID = 0x03
};

/* completion status */
enum {
  XmDROP,
  XmDROP_HELP,
  XmDROP_CANCEL,
  XmDROP_INTERRUPT
};

/* Static data for MOTIF DND */
static GList **motif_target_lists = NULL;
static gint motif_n_target_lists = -1;

/* Byte swapping routines. The motif specification leaves it
 * up to us to save a few bytes in the client messages
 */
static gchar local_byte_order = '\0';

#ifdef G_ENABLE_DEBUG
static void
print_target_list (GList *targets)
{
  while (targets)
    {
771
      gchar *name = gdk_atom_name (GDK_POINTER_TO_ATOM (targets->data));
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
      g_message ("\t%s", name);
      g_free (name);
      targets = targets->next;
    }
}
#endif /* G_ENABLE_DEBUG */

static void
init_byte_order (void)
{
  guint32 myint = 0x01020304;
  local_byte_order = (*(gchar *)&myint == 1) ? 'B' : 'l';
}

static guint16
card16_to_host (guint16 x, gchar byte_order) {
  if (byte_order == local_byte_order)
    return x;
  else
    return (x << 8) | (x >> 8);
}

static guint32
card32_to_host (guint32 x, gchar byte_order) {
  if (byte_order == local_byte_order)
    return x;
  else
    return (x << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | (x >> 24);
}

802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
/* Motif packs together fields of varying length into the
 * client message. We can't rely on accessing these
 * through data.s[], data.l[], etc, because on some architectures
 * (i.e., Alpha) these won't be valid for format == 8. 
 */

#define MOTIF_XCLIENT_BYTE(xevent,i) \
  (xevent)->xclient.data.b[i]
#define MOTIF_XCLIENT_SHORT(xevent,i) \
  ((gint16 *)&((xevent)->xclient.data.b[0]))[i]
#define MOTIF_XCLIENT_LONG(xevent,i) \
  ((gint32 *)&((xevent)->xclient.data.b[0]))[i]

#define MOTIF_UNPACK_BYTE(xevent,i) MOTIF_XCLIENT_BYTE(xevent,i)
#define MOTIF_UNPACK_SHORT(xevent,i) \
  card16_to_host (MOTIF_XCLIENT_SHORT(xevent,i), MOTIF_XCLIENT_BYTE(xevent, 1))
#define MOTIF_UNPACK_LONG(xevent,i) \
  card32_to_host (MOTIF_XCLIENT_LONG(xevent,i), MOTIF_XCLIENT_BYTE(xevent, 1))
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853

/***** Dest side ***********/

/* Property placed on source windows */
typedef struct _MotifDragInitiatorInfo {
  guint8 byte_order;
  guint8 protocol_version;
  guint16 targets_index;
  guint32 selection_atom;
} MotifDragInitiatorInfo;

/* Header for target table on the drag window */
typedef struct _MotifTargetTableHeader {
  guchar byte_order;
  guchar protocol_version;
  guint16 n_lists;
  guint32 total_size;
} MotifTargetTableHeader;

/* Property placed on target windows */
typedef struct _MotifDragReceiverInfo {
  guint8 byte_order;
  guint8 protocol_version;
  guint8 protocol_style;
  guint8 pad;
  guint32 proxy_window;
  guint16 num_drop_sites;
  guint16 padding;
  guint32 total_size;
} MotifDragReceiverInfo;

static Window motif_drag_window = None;
static GdkWindow *motif_drag_gdk_window = NULL;

854 855
static Atom motif_drag_targets_atom = None;
static Atom motif_drag_receiver_info_atom = None;
856 857 858

/* Target table handling */

859
static GdkFilterReturn
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881
motif_drag_window_filter (GdkXEvent *xevent,
			  GdkEvent  *event,
			  gpointer data)
{
  XEvent *xev = (XEvent *)xevent;

  switch (xev->xany.type)
    {
    case DestroyNotify:
      motif_drag_window = None;
      motif_drag_gdk_window = NULL;
      break;
    case PropertyNotify:
      if (motif_target_lists &&
	  motif_drag_targets_atom &&
	  (xev->xproperty.atom == motif_drag_targets_atom))
	motif_read_target_table();
      break;
    }
  return GDK_FILTER_REMOVE;
}

882
static Atom motif_drag_window_atom = None;
883 884 885 886 887 888

static Window
motif_lookup_drag_window (Display *display)
{
  Window retval = None;
  gulong bytes_after, nitems;
889
  Atom type;
890 891 892
  gint format;
  guchar *data;

893
  XGetWindowProperty (gdk_display, _gdk_root_window, motif_drag_window_atom,
894
		      0, 1, FALSE,
895 896 897
		      XA_WINDOW, &type, &format, &nitems, &bytes_after,
		      &data);
  
898
  if ((format == 32) && (nitems == 1) && (bytes_after == 0))
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
    {
      retval = *(Window *)data;
      GDK_NOTE(DND, 
	       g_message ("Found drag window %#lx\n", motif_drag_window));
    }

  if (type != None)
    XFree (data);

  return retval;
}

/* Finds the window where global Motif drag information is stored.
 * If it doesn't exist and 'create' is TRUE, create one.
 */
914
static Window 
915 916 917 918 919
motif_find_drag_window (gboolean create)
{
  if (!motif_drag_window)
    {
      if (!motif_drag_window_atom)
920
	motif_drag_window_atom = gdk_x11_get_xatom_by_name ("_MOTIF_DRAG_WINDOW");
921 922 923 924 925 926 927 928 929

      motif_drag_window = motif_lookup_drag_window (gdk_display);
      
      if (!motif_drag_window && create)
	{
	  /* Create a persistant window. (Copied from LessTif) */
	  
	  Display *display;
	  XSetWindowAttributes attr;
930
	  display = XOpenDisplay (_gdk_display_name);
931 932
	  XSetCloseDownMode (display, RetainPermanent);

933
          XGrabServer (display);
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
	  
	  motif_drag_window = motif_lookup_drag_window (display);

	  if (!motif_drag_window)
	    {
	      attr.override_redirect = True;
	      attr.event_mask = PropertyChangeMask;
	      
	      motif_drag_window = 
		XCreateWindow(display, DefaultRootWindow(display),
			      -100, -100, 10, 10, 0, 0,
			      InputOnly, CopyFromParent,
			      (CWOverrideRedirect | CWEventMask), &attr);
	      
	      GDK_NOTE (DND,
			g_message ("Created drag window %#lx\n", motif_drag_window));
	      
951
	      XChangeProperty (display, _gdk_root_window,
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979
			       motif_drag_window_atom, XA_WINDOW,
			       32, PropModeReplace,
			       (guchar *)&motif_drag_window_atom, 1);

	    }
	  XUngrabServer (display);
	  XCloseDisplay (display);
	}

      /* There is a miniscule race condition here if the drag window
       * gets destroyed exactly now.
       */
      if (motif_drag_window)
	{
	  motif_drag_gdk_window = gdk_window_foreign_new (motif_drag_window);
	  gdk_window_add_filter (motif_drag_gdk_window,
				 motif_drag_window_filter,
				 NULL);
	}
    }

  return motif_drag_window;
}

static void 
motif_read_target_table (void)
{
  gulong bytes_after, nitems;
980
  Atom type;
981 982 983 984
  gint format;
  gint i, j;

  if (!motif_drag_targets_atom)
985
    motif_drag_targets_atom = gdk_x11_get_xatom_by_name ("_MOTIF_DRAG_TARGETS");
986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003

  if (motif_target_lists)
    {
      for (i=0; i<motif_n_target_lists; i++)
	g_list_free (motif_target_lists[i]);
      
      g_free (motif_target_lists);
      motif_target_lists = NULL;
      motif_n_target_lists = 0;
    }

  if (motif_find_drag_window (FALSE))
    {
      MotifTargetTableHeader *header = NULL;
      guchar *target_bytes = NULL;
      guchar *p;
      gboolean success = FALSE;

Owen Taylor's avatar
Owen Taylor committed
1004
      gdk_error_trap_push ();
1005 1006 1007 1008 1009 1010 1011
      XGetWindowProperty (gdk_display, motif_drag_window, 
			  motif_drag_targets_atom,
			  0, (sizeof(MotifTargetTableHeader)+3)/4, FALSE,
			  motif_drag_targets_atom, 
			  &type, &format, &nitems, &bytes_after,
			  (guchar **)&header);

Owen Taylor's avatar
Owen Taylor committed
1012
      if (gdk_error_trap_pop () || (format != 8) || (nitems < sizeof (MotifTargetTableHeader)))
1013 1014 1015 1016 1017
	goto error;

      header->n_lists = card16_to_host (header->n_lists, header->byte_order);
      header->total_size = card32_to_host (header->total_size, header->byte_order);

Owen Taylor's avatar
Owen Taylor committed
1018
      gdk_error_trap_push ();
1019 1020
      XGetWindowProperty (gdk_display, motif_drag_window, motif_drag_targets_atom,
			  (sizeof(MotifTargetTableHeader)+3)/4, 
1021
			  (header->total_size + 3)/4 - (sizeof(MotifTargetTableHeader) + 3)/4,
1022 1023 1024 1025
			  FALSE,
			  motif_drag_targets_atom, &type, &format, &nitems, 
			  &bytes_after, &target_bytes);
      
Owen Taylor's avatar
Owen Taylor committed
1026
      if (gdk_error_trap_pop () || (format != 8) || (bytes_after != 0) || 
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
	  (nitems != header->total_size - sizeof(MotifTargetTableHeader)))
	  goto error;

      motif_n_target_lists = header->n_lists;
      motif_target_lists = g_new0 (GList *, motif_n_target_lists);

      p = target_bytes;
      for (i=0; i<header->n_lists; i++)
	{
	  gint n_targets;
	  guint32 *targets;
	  
	  if (p + sizeof(guint16) - target_bytes > nitems)
	    goto error;

	  n_targets = card16_to_host (*(gushort *)p, header->byte_order);
1043 1044 1045 1046 1047 1048

	  /* We need to make a copy of the targets, since it may
	   * be unaligned
	   */
	  targets = g_new (guint32, n_targets);
	  memcpy (targets, p + sizeof(guint16), sizeof(guint32) * n_targets);
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058

	  p +=  sizeof(guint16) + n_targets * sizeof(guint32);
	  if (p - target_bytes > nitems)
	    goto error;

	  for (j=0; j<n_targets; j++)
	    motif_target_lists[i] = 
	      g_list_prepend (motif_target_lists[i],
			      GUINT_TO_POINTER (card32_to_host (targets[j], 
								header->byte_order)));
1059
	  g_free (targets);
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
	  motif_target_lists[i] = g_list_reverse (motif_target_lists[i]);
	}

      success = TRUE;
      
    error:
      if (header)
	XFree (header);
      
      if (target_bytes)
	XFree (target_bytes);

      if (!success)
	{
	  if (motif_target_lists)
	    {
	      g_free (motif_target_lists);
	      motif_target_lists = NULL;
	      motif_n_target_lists = 0;
	    }
	  g_warning ("Error reading Motif target table\n");
	}
    }
}

static gint
targets_sort_func (gconstpointer a, gconstpointer b)
{
  return (GPOINTER_TO_UINT (a) < GPOINTER_TO_UINT (b)) ?
    -1 : ((GPOINTER_TO_UINT (a) > GPOINTER_TO_UINT (b)) ? 1 : 0);
}

/* Check if given (sorted) list is in the targets table */
static gboolean
motif_target_table_check (GList *sorted)
{
  GList *tmp_list1, *tmp_list2;
  gint i;

  for (i=0; i<motif_n_target_lists; i++)
    {
      tmp_list1 = motif_target_lists[i];
      tmp_list2 = sorted;
      
      while (tmp_list1 && tmp_list2)
	{
	  if (tmp_list1->data != tmp_list2->data)
	    break;

	  tmp_list1 = tmp_list1->next;
	  tmp_list2 = tmp_list2->next;
	}
      if (!tmp_list1 && !tmp_list2)	/* Found it */
	return i;
    }

  return -1;
}

static gint
1120
motif_add_to_target_table (GList *targets) /* targets is list of GdkAtom */
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
{
  GList *sorted = NULL;
  gint index = -1;
  gint i;
  GList *tmp_list;
  
  /* make a sorted copy of the list */
  
  while (targets)
    {
1131 1132
      Atom xatom = gdk_x11_atom_to_xatom (GDK_POINTER_TO_ATOM (targets->data));
      sorted = g_list_insert_sorted (sorted, GUINT_TO_POINTER (xatom), targets_sort_func);
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
      targets = targets->next;
    }

  /* First check if it is their already */

  if (motif_target_lists)
    index = motif_target_table_check (sorted);

  /* We need to grab the server while doing this, to ensure
   * atomiticity. Ugh
   */

  if (index < 0)
    {
      /* We need to make sure that it exists _before_ we grab the
       * server, since we can't open a new connection after we
       * grab the server. 
       */
      motif_find_drag_window (TRUE);

1153
      gdk_x11_grab_server ();
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
      motif_read_target_table();
    
      /* Check again, in case it was added in the meantime */
      
      if (motif_target_lists)
	index =  motif_target_table_check (sorted);

      if (index < 0)
	{
	  guint32 total_size = 0;
	  guchar *data;
	  guchar *p;
	  guint16 *p16;
	  MotifTargetTableHeader *header;
	  
	  if (!motif_target_lists)
	    {
	      motif_target_lists = g_new (GList *, 1);
	      motif_n_target_lists = 1;
	    }
	  else
	    {
	      motif_n_target_lists++;
	      motif_target_lists = g_realloc (motif_target_lists,
					      sizeof(GList *) * motif_n_target_lists);
	    }
	  motif_target_lists[motif_n_target_lists - 1] = sorted;
	  sorted = NULL;
	  index = motif_n_target_lists - 1;

	  total_size = sizeof (MotifTargetTableHeader);
	  for (i = 0; i < motif_n_target_lists ; i++)
	    total_size += sizeof(guint16) + sizeof(guint32) * g_list_length (motif_target_lists[i]);

	  data = g_malloc (total_size);

	  header = (MotifTargetTableHeader *)data;
	  p = data + sizeof(MotifTargetTableHeader);

	  header->byte_order = local_byte_order;
	  header->protocol_version = 0;
	  header->n_lists = motif_n_target_lists;
	  header->total_size = total_size;

	  for (i = 0; i < motif_n_target_lists ; i++)
	    {
1200 1201 1202
	      guint16 n_targets = g_list_length (motif_target_lists[i]);
	      guint32 *targets = g_new (guint32, n_targets);
	      guint32 *p32 = targets;
1203 1204 1205 1206
	      
	      tmp_list = motif_target_lists[i];
	      while (tmp_list)
		{
1207 1208
		  *p32 = GPOINTER_TO_UINT (tmp_list->data);
		  
1209
		  tmp_list = tmp_list->next;
1210
		  p32++;
1211
		}
1212 1213 1214 1215 1216 1217 1218 1219 1220

	      p16 = (guint16 *)p;
	      p += sizeof(guint16);

	      memcpy (p, targets, n_targets * sizeof(guint32));

	      *p16 = n_targets;
	      p += sizeof(guint32) * n_targets;
	      g_free (targets);
1221 1222 1223 1224 1225 1226 1227 1228
	    }

	  XChangeProperty (gdk_display, motif_drag_window,
			   motif_drag_targets_atom,
			   motif_drag_targets_atom,
			   8, PropModeReplace,
			   data, total_size);
	}
1229
      gdk_x11_ungrab_server ();
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
    }

  g_list_free (sorted);
  return index;
}

/* Translate flags */

static void
motif_dnd_translate_flags (GdkDragContext *context, guint16 flags)
{
  guint recommended_op = flags & 0x000f;
  guint possible_ops = (flags & 0x0f0) >> 4;
  
  switch (recommended_op)
    {
    case XmDROP_MOVE:
      context->suggested_action = GDK_ACTION_MOVE;
      break;
    case XmDROP_COPY:
      context->suggested_action = GDK_ACTION_COPY;
      break;
    case XmDROP_LINK:
      context->suggested_action = GDK_ACTION_LINK;
      break;
    default:
      context->suggested_action = GDK_ACTION_COPY;
      break;
    }

  context->actions = 0;
  if (possible_ops & XmDROP_MOVE)
    context->actions |= GDK_ACTION_MOVE;
  if (possible_ops & XmDROP_COPY)
    context->actions |= GDK_ACTION_COPY;
  if (possible_ops & XmDROP_LINK)
    context->actions |= GDK_ACTION_LINK;
}

static guint16
motif_dnd_get_flags (GdkDragContext *context)
{
  guint16 flags = 0;
  
  switch (context->suggested_action)
    {
    case GDK_ACTION_MOVE:
      flags = XmDROP_MOVE;
      break;
    case GDK_ACTION_COPY:
      flags = XmDROP_COPY;
      break;
    case GDK_ACTION_LINK:
      flags = XmDROP_LINK;
      break;
    default:
      flags = XmDROP_NOOP;
      break;
    }
  
  if (context->actions & GDK_ACTION_MOVE)
    flags |= XmDROP_MOVE << 8;
  if (context->actions & GDK_ACTION_COPY)
    flags |= XmDROP_COPY << 8;
  if (context->actions & GDK_ACTION_LINK)
    flags |= XmDROP_LINK << 8;

  return flags;
}

/* Source Side */

static void
motif_set_targets (GdkDragContext *context)
{
1305
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
1306 1307
  MotifDragInitiatorInfo info;
  gint i;
1308
  static Atom motif_drag_initiator_info = None;
1309 1310

  if (!motif_drag_initiator_info)
1311
    motif_drag_initiator_info = gdk_x11_get_xatom_by_name ("_MOTIF_DRAG_INITIATOR_INFO");
1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322

  info.byte_order = local_byte_order;
  info.protocol_version = 0;
  
  info.targets_index = motif_add_to_target_table (context->targets);

  for (i=0; ; i++)
    {
      gchar buf[20];
      g_snprintf(buf, 20, "_GDK_SELECTION_%d", i);
      
1323
      private->motif_selection = gdk_x11_get_xatom_by_name (buf);
1324 1325 1326 1327 1328 1329
      if (!XGetSelectionOwner (gdk_display, private->motif_selection))
	break;
    }

  info.selection_atom = private->motif_selection;

1330 1331
  XChangeProperty (GDK_DRAWABLE_XDISPLAY (context->source_window),
		   GDK_DRAWABLE_XID (context->source_window),
1332 1333 1334 1335 1336