gdkdnd-x11.c 91.6 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

#include "gdk.h"          /* For gdk_flush() */
32
#include "gdkx.h"
Owen Taylor's avatar
Started  
Owen Taylor committed
33 34
#include "gdkdnd.h"
#include "gdkproperty.h"
35
#include "gdkprivate-x11.h"
36 37 38
#include "gdkinternals.h"
#include "gdkscreen-x11.h"
#include "gdkdisplay-x11.h"
39

40
typedef struct _GdkDragContextPrivateX11 GdkDragContextPrivateX11;
41

42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
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;
59
  GdkScreen *screen;
60 61 62 63 64
} GdkWindowCache;

/* Structure that holds information about a drag in progress.
 * this is used on both source and destination sides.
 */
65
struct _GdkDragContextPrivateX11 {
66 67
  GdkDragContext context;

68 69
  Atom motif_selection;
  Atom xdnd_selection;
70 71 72 73
  guint   ref_count;

  guint16 last_x;		/* Coordinates from last event */
  guint16 last_y;
74 75 76
  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 */
77

78 79
  Window dest_xid;              /* The last window we looked up */
  Window drop_xid;            /* The (non-proxied) window that is receiving drops */
80
  guint xdnd_targets_set : 1;   /* Whether we've already set XdndTypeList */
81
  guint xdnd_actions_set : 1;   /* Whether we've already set XdndActionList */
82
  guint xdnd_have_actions : 1; /* Whether an XdndActionList was provided */
83 84 85
  guint motif_targets_set : 1;  /* Whether we've already set motif initiator info */
  guint drag_status : 4;	/* current status of drag */

86
  GSList *window_caches;
87 88
};

89 90
#define PRIVATE_DATA(context) ((GdkDragContextPrivateX11 *) GDK_DRAG_CONTEXT (context)->windowing_data)

91 92 93 94
/* Forward declarations */

static void gdk_window_cache_destroy (GdkWindowCache *cache);

95 96
static void motif_read_target_table (GdkDisplay *display);

97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124
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);

125 126 127 128
static void   xdnd_manage_source_filter (GdkDragContext *context,
					 GdkWindow      *window,
					 gboolean        add_filter);

129 130 131
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);
132

133
static gpointer parent_class = NULL;
134 135
static GList *contexts;

136 137
GType
gdk_drag_context_get_type (void)
138
{
139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
  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",
158
                                            &object_info, 0);
159 160 161 162
    }
  
  return object_type;
}
163

164 165 166 167
static void
gdk_drag_context_init (GdkDragContext *dragcontext)
{
  GdkDragContextPrivateX11 *private;
168

169
  private = g_new0 (GdkDragContextPrivateX11, 1);
170

171
  dragcontext->windowing_data = private;
172

173
  contexts = g_list_prepend (contexts, dragcontext);
174 175
}

176 177
static void
gdk_drag_context_class_init (GdkDragContextClass *klass)
178
{
179 180 181
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);
Jeff Garzik's avatar
Jeff Garzik committed
182

183
  object_class->finalize = gdk_drag_context_finalize;
184 185
}

186 187
static void
gdk_drag_context_finalize (GObject *object)
188
{
189 190
  GdkDragContext *context = GDK_DRAG_CONTEXT (object);
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
191
  GSList *tmp_list;
192
  
193 194 195
  g_list_free (context->targets);

  if (context->source_window)
196
    {
197 198 199
      if ((context->protocol == GDK_DRAG_PROTO_XDND) &&
          !context->is_source)
        xdnd_manage_source_filter (context, context->source_window, FALSE);
200
      
201
      g_object_unref (context->source_window);
202 203 204
    }
  
  if (context->dest_window)
205
    g_object_unref (context->dest_window);
206 207 208 209

  for (tmp_list = private->window_caches; tmp_list; tmp_list = tmp_list->next)
    gdk_window_cache_destroy (tmp_list->data);
  g_slist_free (private->window_caches);
210 211
  
  contexts = g_list_remove (contexts, context);
212

213 214 215 216
  g_free (private);
  
  G_OBJECT_CLASS (parent_class)->finalize (object);
}
217

218 219 220 221 222
/* Drag Contexts */

GdkDragContext *
gdk_drag_context_new        (void)
{
223
  return g_object_new (gdk_drag_context_get_type (), NULL);
224 225 226 227 228 229
}

void            
gdk_drag_context_ref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
230

231
  g_object_ref (context);
232
}
233

234 235 236 237
void            
gdk_drag_context_unref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
238

239
  g_object_unref (context);
240 241 242
}

static GdkDragContext *
243 244 245 246
gdk_drag_context_find (GdkDisplay *display,
		       gboolean    is_source,
		       Window      source_xid,
		       Window      dest_xid)
247 248
{
  GList *tmp_list = contexts;
Jeff Garzik's avatar
Jeff Garzik committed
249
  GdkDragContext *context;
250
  GdkDragContextPrivateX11 *private;
251
  Window context_dest_xid;
252 253 254

  while (tmp_list)
    {
Jeff Garzik's avatar
Jeff Garzik committed
255
      context = (GdkDragContext *)tmp_list->data;
256
      private = PRIVATE_DATA (context);
257

258 259 260 261
      if ((context->source_window && gdk_drawable_get_display (context->source_window) != display) ||
	  (context->dest_window && gdk_drawable_get_display (context->dest_window) != display))
	continue;

262
      context_dest_xid = context->dest_window ? 
263 264 265 266
                            (private->drop_xid ?
                              private->drop_xid :
                              GDK_DRAWABLE_XID (context->dest_window)) :
	                     None;
267 268 269

      if ((!context->is_source == !is_source) &&
	  ((source_xid == None) || (context->source_window &&
270
	    (GDK_DRAWABLE_XID (context->source_window) == source_xid))) &&
271
	  ((dest_xid == None) || (context_dest_xid == dest_xid)))
272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341
	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)
		  {
342 343
		    /* Put the window above (before in the list) above_node
		     */
344
		    cache->children = g_list_remove_link (cache->children, node);
345 346 347
		    node->prev = above_node->prev;
		    if (node->prev)
		      node->prev->next = node;
348 349
		    else
		      cache->children = node;
350 351
		    node->next = above_node;
		    above_node->prev = node;
352 353 354 355 356 357 358 359
		  }
	      }
	  }
	break;
      }
    case CreateNotify:
      {
	XCreateWindowEvent *xcwe = &xevent->xcreatewindow;
360

361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421
	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 *
422
gdk_window_cache_new (GdkScreen *screen)
423 424 425 426 427
{
  XWindowAttributes xwa;
  Window root, parent, *children;
  unsigned int nchildren;
  int i;
428 429
  Display *xdisplay = GDK_SCREEN_XDISPLAY (screen);
  GdkWindow *root_window = gdk_screen_get_root_window (screen);
430 431 432 433 434
  
  GdkWindowCache *result = g_new (GdkWindowCache, 1);

  result->children = NULL;
  result->child_hash = g_hash_table_new (g_direct_hash, NULL);
435
  result->screen = screen;
436

437
  XGetWindowAttributes (xdisplay, GDK_WINDOW_XWINDOW (root_window), &xwa);
438
  result->old_event_mask = xwa.your_event_mask;
439
  XSelectInput (xdisplay, GDK_WINDOW_XWINDOW (root_window),
440
		result->old_event_mask | SubstructureNotifyMask);
441
  gdk_window_add_filter (root_window, gdk_window_cache_filter, result);
442

443 444
  gdk_error_trap_push ();

445
  if (!XQueryTree(xdisplay, GDK_WINDOW_XWINDOW (root_window),
446 447 448 449 450
		  &root, &parent, &children, &nchildren))
    {
      gdk_error_trap_pop ();
      return result;
    }
451 452 453
  
  for (i = 0; i < nchildren ; i++)
    {
454
      if (XGetWindowAttributes (xdisplay, children[i], &xwa))
455 456 457
	gdk_window_cache_add (result, children[i],
			      xwa.x, xwa.y, xwa.width, xwa.height,
			      xwa.map_state != IsUnmapped);
458 459 460
    }

  XFree (children);
461
  gdk_error_trap_pop ();
462 463 464 465 466 467 468

  return result;
}

static void
gdk_window_cache_destroy (GdkWindowCache *cache)
{
469 470 471 472 473 474
  GdkWindow *root_window = gdk_screen_get_root_window (cache->screen);
  
  XSelectInput (GDK_WINDOW_XDISPLAY (root_window), 
		GDK_WINDOW_XWINDOW (root_window),
		cache->old_event_mask);
  gdk_window_remove_filter (root_window, gdk_window_cache_filter, cache);
475 476 477 478

  g_list_foreach (cache->children, (GFunc)g_free, NULL);
  g_list_free (cache->children);
  g_hash_table_destroy (cache->child_hash);
479 480

  g_free (cache);
481 482 483
}

static Window
484 485 486 487
get_client_window_at_coords_recurse (GdkDisplay *display,
				     Window      win,
				     gint        x,
				     gint        y)
488
{
489 490 491 492
  Window root, tmp_parent, *children;
  unsigned int nchildren;
  int i;
  Window child = None;
493 494 495 496 497
  Atom type = None;
  int format;
  unsigned long nitems, after;
  unsigned char *data;
  
498 499 500
  if (XGetWindowProperty (GDK_DISPLAY_XDISPLAY(display), win,
			  gdk_x11_get_xatom_by_name_for_display (display, "WM_STATE"),
			  0, 0, False, AnyPropertyType,
501 502
			  &type, &format, &nitems, &after, &data) != Success)
    return None;
503 504 505 506 507 508 509

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

510 511
#if 0
  /* This is beautiful! Damn Enlightenment and click-to-focus */
512 513 514
  if (!XTranslateCoordinates (gdk_display, _gdk_root_window, win,
			      x_root, y_root, &dest_x, &dest_y, &child))
    return None;
515 516
  
#else
517 518
  if (!XQueryTree (GDK_DISPLAY_XDISPLAY (display), win,
		   &root, &tmp_parent, &children, &nchildren))
519
    return 0;
520 521
  
  for (i = nchildren - 1; (i >= 0) && (child == None); i--)
522
    {
523 524
      XWindowAttributes xwa;
      
525 526
      if (XGetWindowAttributes (GDK_DISPLAY_XDISPLAY (display),
				children[i], &xwa))
527
	{
528 529 530
	  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))
531 532 533 534 535 536 537
	    {
	      x -= xwa.x;
	      y -= xwa.y;
	      child = children[i];
	    }
	}
    }
538 539
  
  XFree (children);
540
#endif  
541 542

  if (child)
543
    return get_client_window_at_coords_recurse (display, child, x, y);
544 545 546 547
  else
    return None;
}

Jeff Garzik's avatar
Jeff Garzik committed
548
static Window 
549
get_client_window_at_coords (GdkWindowCache *cache,
550 551 552
			     Window          ignore,
			     gint            x_root,
			     gint            y_root)
553 554 555 556
{
  GList *tmp_list;
  Window retval = None;

557
  gdk_error_trap_push ();
558 559 560 561 562 563 564 565 566 567 568 569
  
  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))
	    {
570 571 572
	      retval = get_client_window_at_coords_recurse (gdk_screen_get_display (cache->screen),
							    child->xid,
							    x_root - child->x,
573
							    y_root - child->y);
574 575 576 577 578 579 580 581
	      if (!retval)
		retval = child->xid;
	    }
	  
	}
      tmp_list = tmp_list->next;
    }

582
  gdk_error_trap_pop ();
583 584 585 586
  
  if (retval)
    return retval;
  else
587
    return GDK_WINDOW_XWINDOW (gdk_screen_get_root_window (cache->screen));
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
}

/*************************************************************
 ***************************** 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
};

/* 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)
    {
652
      gchar *name = gdk_atom_name (GDK_POINTER_TO_ATOM (targets->data));
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
      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);
}

683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700
/* 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))
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733

/***** 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;

/* Target table handling */

734
static GdkFilterReturn
735 736 737 738 739
motif_drag_window_filter (GdkXEvent *xevent,
			  GdkEvent  *event,
			  gpointer data)
{
  XEvent *xev = (XEvent *)xevent;
740 741
  GdkDisplay *display = GDK_WINDOW_DISPLAY (event->any.window); 
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
742 743 744 745

  switch (xev->xany.type)
    {
    case DestroyNotify:
746 747
      display_x11->motif_drag_window = None;
      display_x11->motif_drag_gdk_window = NULL;
748 749
      break;
    case PropertyNotify:
750 751 752
      if (display_x11->motif_target_lists &&
	  (xev->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_TARGETS")))
	motif_read_target_table (display);
753 754 755 756 757 758
      break;
    }
  return GDK_FILTER_REMOVE;
}

static Window
759 760
motif_lookup_drag_window (GdkDisplay *display,
			  Display    *lookup_xdisplay)
761 762 763
{
  Window retval = None;
  gulong bytes_after, nitems;
764
  Atom type;
765 766 767
  gint format;
  guchar *data;

768 769
  XGetWindowProperty (lookup_xdisplay, DefaultRootWindow (lookup_xdisplay),
		      gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_WINDOW"),
770
		      0, 1, FALSE,
771 772 773
		      XA_WINDOW, &type, &format, &nitems, &bytes_after,
		      &data);
  
774
  if ((format == 32) && (nitems == 1) && (bytes_after == 0))
775 776
    {
      retval = *(Window *)data;
777 778
      GDK_NOTE (DND, 
		g_message ("Found drag window %#lx\n", GDK_DISPLAY_X11 (display)->motif_drag_window));
779 780 781 782 783 784 785 786 787 788 789
    }

  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.
 */
790
static Window 
791 792
motif_find_drag_window (GdkDisplay *display,
			gboolean    create)
793
{
794 795 796
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
  
  if (!display_x11->motif_drag_window)
797
    {
798 799
      Atom motif_drag_window_atom = gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_WINDOW");
      display_x11->motif_drag_window = motif_lookup_drag_window (display, display_x11->xdisplay);
800
      
801
      if (!display_x11->motif_drag_window && create)
802 803 804
	{
	  /* Create a persistant window. (Copied from LessTif) */
	  
805
	  Display *persistant_xdisplay;
806
	  XSetWindowAttributes attr;
807 808
	  persistant_xdisplay = XOpenDisplay (gdk_display_get_name (display));
	  XSetCloseDownMode (persistant_xdisplay, RetainPermanent);
809

810
	  XGrabServer (persistant_xdisplay);
811
	  
812
	  display_x11->motif_drag_window = motif_lookup_drag_window (display, persistant_xdisplay);
813

814
	  if (!display_x11->motif_drag_window)
815 816 817 818
	    {
	      attr.override_redirect = True;
	      attr.event_mask = PropertyChangeMask;
	      
819 820 821
	       display_x11->motif_drag_window = 
		XCreateWindow (persistant_xdisplay, 
			       DefaultRootWindow (persistant_xdisplay),
822 823 824 825 826
			      -100, -100, 10, 10, 0, 0,
			      InputOnly, CopyFromParent,
			      (CWOverrideRedirect | CWEventMask), &attr);
	      
	      GDK_NOTE (DND,
827
			g_message ("Created drag window %#lx\n", display_x11->motif_drag_window));
828
	      
829 830
	      XChangeProperty (persistant_xdisplay, 
			       DefaultRootWindow (persistant_xdisplay),
831 832 833 834 835
			       motif_drag_window_atom, XA_WINDOW,
			       32, PropModeReplace,
			       (guchar *)&motif_drag_window_atom, 1);

	    }
836 837
	  XUngrabServer (persistant_xdisplay);
	  XCloseDisplay (persistant_xdisplay);
838 839 840 841 842
	}

      /* There is a miniscule race condition here if the drag window
       * gets destroyed exactly now.
       */
843
      if (display_x11->motif_drag_window)
844
	{
845 846 847
	  display_x11->motif_drag_gdk_window = 
	    gdk_window_foreign_new_for_display (display, display_x11->motif_drag_window);
	  gdk_window_add_filter (display_x11->motif_drag_gdk_window,
848 849 850 851 852
				 motif_drag_window_filter,
				 NULL);
	}
    }

853
  return display_x11->motif_drag_window;
854 855 856
}

static void 
857
motif_read_target_table (GdkDisplay *display)
858
{
859
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
860
  gulong bytes_after, nitems;
861
  Atom type;
862 863
  gint format;
  gint i, j;
864 865
  
  Atom motif_drag_targets_atom = gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_TARGETS");
866

867
  if (display_x11->motif_target_lists)
868
    {
869 870
      for (i=0; i<display_x11->motif_n_target_lists; i++)
	g_list_free (display_x11->motif_target_lists[i]);
871
      
872 873 874
      g_free (display_x11->motif_target_lists);
      display_x11->motif_target_lists = NULL;
      display_x11->motif_n_target_lists = 0;
875 876
    }

877
  if (motif_find_drag_window (display, FALSE))
878 879 880 881 882 883
    {
      MotifTargetTableHeader *header = NULL;
      guchar *target_bytes = NULL;
      guchar *p;
      gboolean success = FALSE;

Owen Taylor's avatar
Owen Taylor committed
884
      gdk_error_trap_push ();
885 886
      XGetWindowProperty (display_x11->xdisplay, 
			  display_x11->motif_drag_window, 
887 888 889 890 891 892
			  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
893
      if (gdk_error_trap_pop () || (format != 8) || (nitems < sizeof (MotifTargetTableHeader)))
894 895 896 897 898
	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
899
      gdk_error_trap_push ();
900 901 902
      XGetWindowProperty (display_x11->xdisplay, 
			  display_x11->motif_drag_window, 
		          motif_drag_targets_atom,
903
			  (sizeof(MotifTargetTableHeader)+3)/4, 
904
			  (header->total_size + 3)/4 - (sizeof(MotifTargetTableHeader) + 3)/4,
905 906 907 908
			  FALSE,
			  motif_drag_targets_atom, &type, &format, &nitems, 
			  &bytes_after, &target_bytes);
      
Owen Taylor's avatar
Owen Taylor committed
909
      if (gdk_error_trap_pop () || (format != 8) || (bytes_after != 0) || 
910 911 912
	  (nitems != header->total_size - sizeof(MotifTargetTableHeader)))
	  goto error;

913 914
      display_x11->motif_n_target_lists = header->n_lists;
      display_x11->motif_target_lists = g_new0 (GList *, display_x11->motif_n_target_lists);
915 916 917 918 919 920 921 922 923 924 925

      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);
926 927 928 929 930 931

	  /* 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);
932 933 934 935 936 937

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

	  for (j=0; j<n_targets; j++)
938 939 940
	    display_x11->motif_target_lists[i] = 
	      g_list_prepend (display_x11->motif_target_lists[i],
			      GUINT_TO_POINTER (card32_to_host (targets[j],
941
								header->byte_order)));
942
	  g_free (targets);
943
	  display_x11->motif_target_lists[i] = g_list_reverse (display_x11->motif_target_lists[i]);
944 945 946 947 948 949 950 951 952 953 954 955 956
	}

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

      if (!success)
	{
957
	  if (display_x11->motif_target_lists)
958
	    {
959 960 961
	      g_free (display_x11->motif_target_lists);
	      display_x11->motif_target_lists = NULL;
	      display_x11->motif_n_target_lists = 0;
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976
	    }
	  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
977 978
motif_target_table_check (GdkDisplay *display,
			  GList      *sorted)
979
{
980
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
981 982 983
  GList *tmp_list1, *tmp_list2;
  gint i;

984
  for (i=0; i<display_x11->motif_n_target_lists; i++)
985
    {
986
      tmp_list1 = display_x11->motif_target_lists[i];
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
      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
1005 1006
motif_add_to_target_table (GdkDisplay *display,
			   GList      *targets) /* targets is list of GdkAtom */
1007
{
1008
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
1009 1010 1011 1012 1013 1014 1015 1016 1017
  GList *sorted = NULL;
  gint index = -1;
  gint i;
  GList *tmp_list;
  
  /* make a sorted copy of the list */
  
  while (targets)
    {
1018
      Atom xatom = gdk_x11_atom_to_xatom_for_display (display, GDK_POINTER_TO_ATOM (targets->data));
1019
      sorted = g_list_insert_sorted (sorted, GUINT_TO_POINTER (xatom), targets_sort_func);
1020 1021 1022 1023 1024
      targets = targets->next;
    }

  /* First check if it is their already */

1025 1026
  if (display_x11->motif_target_lists)
    index = motif_target_table_check (display, sorted);
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037

  /* 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. 
       */
1038
      motif_find_drag_window (display, TRUE);
1039

1040 1041
      gdk_x11_display_grab (display);
      motif_read_target_table (display);
1042 1043 1044
    
      /* Check again, in case it was added in the meantime */
      
1045 1046
      if (display_x11->motif_target_lists)
	index =  motif_target_table_check (display, sorted);
1047 1048 1049 1050 1051 1052 1053 1054 1055

      if (index < 0)
	{
	  guint32 total_size = 0;
	  guchar *data;
	  guchar *p;
	  guint16 *p16;
	  MotifTargetTableHeader *header;
	  
1056
	  if (!display_x11->motif_target_lists)
1057
	    {
1058 1059
	      display_x11->motif_target_lists = g_new (GList *, 1);
	      display_x11->motif_n_target_lists = 1;
1060 1061 1062
	    }
	  else
	    {
1063 1064 1065
	      display_x11->motif_n_target_lists++;
	      display_x11->motif_target_lists = g_realloc (display_x11->motif_target_lists,
							   sizeof(GList *) * display_x11->motif_n_target_lists);
1066
	    }
1067
	  display_x11->motif_target_lists[display_x11->motif_n_target_lists - 1] = sorted;
1068
	  sorted = NULL;
1069
	  index = display_x11->motif_n_target_lists - 1;
1070 1071

	  total_size = sizeof (MotifTargetTableHeader);
1072 1073
	  for (i = 0; i < display_x11->motif_n_target_lists ; i++)
	    total_size += sizeof(guint16) + sizeof(guint32) * g_list_length (display_x11->motif_target_lists[i]);
1074 1075 1076 1077 1078 1079 1080 1081

	  data = g_malloc (total_size);

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

	  header->byte_order = local_byte_order;
	  header->protocol_version = 0;
1082
	  header->n_lists = display_x11->motif_n_target_lists;
1083 1084
	  header->total_size = total_size;

1085
	  for (i = 0; i < display_x11->motif_n_target_lists ; i++)
1086
	    {
1087
	      guint16 n_targets = g_list_length (display_x11->motif_target_lists[i]);
1088 1089
	      guint32 *targets = g_new (guint32, n_targets);
	      guint32 *p32 = targets;
1090