mcs/class/Managed.Windows.Forms/System.Windows.Forms/X11Dnd.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2005 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jackson Harper (jackson@ximian.com)
  24 //
  25 //
  26
  27
  28 using System;
  29 using System.IO;
  30 using System.Text;
  31 using System.Drawing;
  32 using System.Collections;
  33 using System.Runtime.Serialization;
  34 using System.Runtime.InteropServices;
  35 using System.Runtime.Serialization.Formatters.Binary;
  36
  37 namespace System.Windows.Forms {
  38
  39         internal class X11Dnd {
  40
  41                 private enum State {
  42                         Accepting,
  43                         Dragging
  44                 }
  45
  46                 private enum DragState {
  47                         None,
  48                         Beginning,
  49                         Dragging,
  50                         Entered
  51                 }
  52
  53                 private interface IDataConverter {
  54                         void GetData (X11Dnd dnd, DataObject data, ref XEvent xevent);
  55                         void SetData (X11Dnd dnd, object data, ref XEvent xevent);
  56                 }
  57
  58                 private delegate void MimeConverter (IntPtr dsp,
  59                                 DataObject data, ref XEvent xevent);
  60
  61                 private class MimeHandler {
  62                         public string Name;
  63                         public IntPtr Type;
  64                         public IntPtr NonProtocol;
  65                         public IDataConverter Converter;
  66
  67                         public MimeHandler (string name, IDataConverter converter)
  68                         {
  69                                 Name = name;
  70                                 Converter = converter;
  71                         }
  72
  73                         public override string ToString ()
  74                         {
  75                                 return "MimeHandler {" + Name + "}";
  76                         }
  77                 }
  78
  79                 private MimeHandler [] MimeHandlers = {
  80 //                        new MimeHandler ("WCF_DIB"),
  81 //                        new MimeHandler ("image/gif", new MimeConverter (ImageConverter)),
  82 //                      new MimeHandler ("text/rtf", new MimeConverter (RtfConverter)),
  83 //                      new MimeHandler ("text/richtext", new MimeConverter (RtfConverter)),
  84
  85                         new MimeHandler ("text/plain", new TextConverter ()),
  86                         new MimeHandler ("text/html", new HtmlConverter ()),
  87                         new MimeHandler ("text/uri-list", new UriListConverter ()),
  88                         new MimeHandler ("application/x-mono-serialized-object",
  89                                         new SerializedObjectConverter ())
  90                 };
  91
  92                 private class SerializedObjectConverter : IDataConverter {
  93
  94                         public void GetData (X11Dnd dnd, DataObject data, ref XEvent xevent)
  95                         {
  96                                 MemoryStream stream = dnd.GetData (ref xevent);
  97                                 BinaryFormatter bf = new BinaryFormatter ();
  98
  99                                 if (stream.Length == 0)
 100                                         return;
 101
 102                                 stream.Seek (0, 0);
 103                                 object obj = bf.Deserialize (stream);
 104                                 data.SetData (obj);
 105                         }
 106
 107                         public void SetData (X11Dnd dnd, object data, ref XEvent xevent)
 108                         {
 109                                 if (data == null)
 110                                         return;
 111
 112                                 MemoryStream stream = new MemoryStream ();
 113                                 BinaryFormatter bf = new BinaryFormatter ();
 114
 115                                 bf.Serialize (stream, data);
 116
 117                                 IntPtr buffer = Marshal.AllocHGlobal ((int) stream.Length);
 118                                 stream.Seek (0, 0);
 119
 120                                 for (int i = 0; i < stream.Length; i++) {
 121                                         Marshal.WriteByte (buffer, i, (byte) stream.ReadByte ());
 122                                 }
 123
 124                                 dnd.SetProperty (ref xevent, buffer, (int) stream.Length);
 125                         }
 126                 }
 127
 128                 private class HtmlConverter : IDataConverter {
 129
 130                         public void GetData (X11Dnd dnd, DataObject data, ref XEvent xevent)
 131                         {
 132                                 string text = dnd.GetText (ref xevent, false);
 133                                 if (text == null)
 134                                         return;
 135                                 data.SetData (DataFormats.Text, text);
 136                                 data.SetData (DataFormats.UnicodeText, text);
 137                         }
 138
 139                         public void SetData (X11Dnd dnd, object data, ref XEvent xevent)
 140                         {
 141                                 IntPtr buffer;
 142                                 int len;
 143                                 string str = data as string;
 144
 145                                 if (str == null)
 146                                         return;
 147
 148                                 if (xevent.SelectionRequestEvent.target == (int) Atom.XA_STRING) {
 149                                         byte [] bytes = Encoding.ASCII.GetBytes (str);
 150                                         buffer = Marshal.AllocHGlobal (bytes.Length);
 151                                         len = bytes.Length;
 152                                         for (int i = 0; i < len; i++)
 153                                                 Marshal.WriteByte (buffer, i, bytes [i]);
 154                                 } else {
 155                                         buffer = Marshal.StringToHGlobalAnsi (str);
 156                                         len = 0;
 157                                         while (Marshal.ReadByte (buffer, len) != 0)
 158                                                 len++;
 159                                 }
 160
 161                                 dnd.SetProperty (ref xevent, buffer, len);
 162
 163                                 Marshal.FreeHGlobal (buffer);
 164                         }
 165                 }
 166
 167                 private class TextConverter : IDataConverter {
 168
 169                         public void GetData (X11Dnd dnd, DataObject data, ref XEvent xevent)
 170                         {
 171                                 string text = dnd.GetText (ref xevent, true);
 172                                 if (text == null)
 173                                         return;
 174                                 data.SetData (DataFormats.Text, text);
 175                                 data.SetData (DataFormats.UnicodeText, text);
 176                         }
 177
 178                         public void SetData (X11Dnd dnd, object data, ref XEvent xevent)
 179                         {
 180                                 IntPtr buffer;
 181                                 int len;
 182                                 string str = data as string;
 183
 184                                 if (data == null)
 185                                         return;
 186
 187                                 if (xevent.SelectionRequestEvent.target == (int) Atom.XA_STRING) {
 188                                         byte [] bytes = Encoding.ASCII.GetBytes (str);
 189                                         buffer = Marshal.AllocHGlobal (bytes.Length);
 190                                         len = bytes.Length;
 191                                         for (int i = 0; i < len; i++)
 192                                                 Marshal.WriteByte (buffer, i, bytes [i]);
 193                                 } else {
 194                                         buffer = Marshal.StringToHGlobalAnsi (str);
 195                                         len = 0;
 196                                         while (Marshal.ReadByte (buffer, len) != 0)
 197                                                 len++;
 198                                 }
 199
 200                                 dnd.SetProperty (ref xevent, buffer, len);
 201
 202                                 Marshal.FreeHGlobal (buffer);
 203                         }
 204                 }
 205
 206                 private class UriListConverter : IDataConverter {
 207
 208                         public void GetData (X11Dnd dnd, DataObject data, ref XEvent xevent)
 209                         {
 210                                 string text = dnd.GetText (ref xevent, false);
 211                                 if (text == null)
 212                                         return;
 213
 214                                 // TODO: Do this in a loop instead of just splitting
 215                                 ArrayList uri_list = new ArrayList ();
 216                                 string [] lines = text.Split (new char [] { '\r', '\n' });
 217                                 foreach (string line in lines) {
 218                                         // # is a comment line (see RFC 2483)
 219                                         if (line.StartsWith ("#"))
 220                                                 continue;
 221                                         try {
 222                                                 Uri uri = new Uri (line);
 223                                                 uri_list.Add (uri.LocalPath);
 224                                         } catch { }
 225                                 }
 226
 227                                 string [] l = (string []) uri_list.ToArray (typeof (string));
 228                                 if (l.Length < 1)
 229                                         return;
 230                                 data.SetData (DataFormats.FileDrop, l);
 231                                 data.SetData ("FileName", l [0]);
 232                                 data.SetData ("FileNameW", l [0]);
 233                         }
 234
 235                         public void SetData (X11Dnd dnd, object data, ref XEvent xevent)
 236                         {
 237                                 string [] uri_list = data as string [];
 238
 239                                 if (uri_list == null)
 240                                         return;
 241
 242                                 StringBuilder res = new StringBuilder ();
 243                                 foreach (string uri_str in uri_list) {
 244                                         Uri uri = new Uri (uri_str);
 245                                         res.Append (uri.ToString ());
 246                                         res.Append ("\r\n");
 247                                 }
 248
 249                                 IntPtr buffer = Marshal.StringToHGlobalAnsi ((string) data);
 250                                 int len = 0;
 251                                 while (Marshal.ReadByte (buffer, len) != 0)
 252                                         len++;
 253
 254                                 dnd.SetProperty (ref xevent, buffer, len);
 255                         }
 256                 }
 257
 258                 private class DragData {
 259                         public IntPtr Window;
 260                         public DragState State;
 261                         public object Data;
 262                         public IntPtr Action;
 263                         public IntPtr [] SupportedTypes;
 264
 265                         public IntPtr LastWindow;
 266                         public IntPtr LastTopLevel;
 267
 268                         public bool WillAccept;
 269
 270                         public void Reset ()
 271                         {
 272                                 State = DragState.None;
 273                                 Data = null;
 274                                 SupportedTypes = null;
 275                                 WillAccept = false;
 276                         }
 277                 }
 278
 279                 private class DropData {
 280
 281                 }
 282
 283                 // This version seems to be the most common
 284                 private static readonly uint [] XdndVersion = new uint [] { 4 };
 285
 286                 private IntPtr display;
 287                 private DragData drag_data;
 288
 289                 private IntPtr XdndAware;
 290                 private IntPtr XdndSelection;
 291                 private IntPtr XdndEnter;
 292                 private IntPtr XdndLeave;
 293                 private IntPtr XdndPosition;
 294                 private IntPtr XdndDrop;
 295                 private IntPtr XdndFinished;
 296                 private IntPtr XdndStatus;
 297                 private IntPtr XdndTypeList;
 298                 private IntPtr XdndActionCopy;
 299                 private IntPtr XdndActionMove;
 300                 private IntPtr XdndActionLink;
 301                 private IntPtr XdndActionPrivate;
 302                 private IntPtr XdndActionList;
 303                 private IntPtr XdndActionDescription;
 304                 private IntPtr XdndActionAsk;
 305
 306                 private State state;
 307
 308                 private int converts_pending;
 309                 private bool position_recieved;
 310                 private bool status_sent;
 311                 private IntPtr target;
 312                 private IntPtr source;
 313                 private IntPtr toplevel;
 314                 private DataObject data;
 315
 316                 private IntPtr drag_action;
 317                 private Control control;
 318                 private int pos_x, pos_y;
 319                 private DragDropEffects allowed;
 320                 private DragEventArgs drag_event;
 321
 322                 private Cursor CursorNo;
 323                 private Cursor CursorCopy;
 324                 private Cursor CursorMove;
 325                 private Cursor CursorLink;
 326                 private IntPtr CurrentCursorHandle;
 327
 328                 public X11Dnd (IntPtr display)
 329                 {
 330                         this.display = display;
 331                         Init ();
 332                 }
 333
 334                 public void SetAllowDrop (Hwnd hwnd, bool allow)
 335                 {
 336                         if (hwnd.allow_drop == allow)
 337                                 return;
 338
 339                         XChangeProperty (display, hwnd.whole_window, XdndAware,
 340                                         (IntPtr) Atom.XA_ATOM, 32,
 341                                         PropertyMode.Replace, XdndVersion, allow ? 1 : 0);
 342                         hwnd.allow_drop = allow;
 343                 }
 344
 345                 public DragDropEffects StartDrag (IntPtr handle, object data,
 346                                 DragDropEffects allowed_effects)
 347                 {
 348                         drag_data = new DragData ();
 349                         drag_data.Window = handle;
 350                         drag_data.State = DragState.Beginning;
 351
 352                         drag_data.Data = data;
 353                         drag_data.SupportedTypes = DetermineSupportedTypes (data);
 354
 355                         drag_data.Action = ActionFromEffect (allowed_effects);
 356
 357                         if (CursorNo == null) {
 358                                 // Make sure the cursors are created
 359                                 CursorNo = new Cursor (typeof (X11Dnd), "DnDNo.cur");
 360                                 CursorCopy = new Cursor (typeof (X11Dnd), "DnDCopy.cur");
 361                                 CursorMove = new Cursor (typeof (X11Dnd), "DnDMove.cur");
 362                                 CursorLink = new Cursor (typeof (X11Dnd), "DnDLink.cur");
 363                         }
 364
 365                         drag_data.LastTopLevel = IntPtr.Zero;
 366                         return DragDropEffects.Copy;
 367                 }
 368
 369                 public void HandleButtonRelease (ref XEvent xevent)
 370                 {
 371
 372                         if (drag_data == null)
 373                                 return;
 374
 375                         if (drag_data.State == DragState.Beginning) {
 376                                 state = State.Accepting;
 377                         } else if (drag_data.State != DragState.None) {
 378
 379                                 if (drag_data.WillAccept) {
 380                                         SendDrop (drag_data.LastTopLevel, xevent.AnyEvent.window,
 381                                                         xevent.ButtonEvent.time);
 382                                 }
 383
 384                                 XplatUIX11.XUngrabPointer (display, 0);
 385                                 drag_data.State = DragState.None;
 386                                 // WE can't reset the drag data yet as it is still
 387                                 // most likely going to be used by the SelectionRequest
 388                                 // handlers
 389                         }
 390                 }
 391
 392                 public void HandleMotionNotify (ref XEvent xevent)
 393                 {
 394                         if (drag_data == null)
 395                                 return;
 396
 397                         if (drag_data.State == DragState.Beginning) {
 398                                 int suc;
 399
 400                                 drag_data.State = DragState.Dragging;
 401
 402                                 suc = XplatUIX11.XSetSelectionOwner (display, (int) XdndSelection,
 403                                                 drag_data.Window,
 404                                                 xevent.ButtonEvent.time);
 405
 406                                 if (suc == 0) {
 407                                         Console.Error.WriteLine ("Could not take ownership of XdndSelection aborting drag.");
 408                                         drag_data.Reset ();
 409                                         return;
 410                                 }
 411
 412                                 suc = XGrabPointer (display, xevent.AnyEvent.window,
 413                                                 false,
 414                                                 EventMask.ButtonMotionMask |
 415                                                 EventMask.PointerMotionMask |
 416                                                 EventMask.ButtonPressMask |
 417                                                 EventMask.ButtonReleaseMask,
 418                                                 GrabMode.GrabModeAsync,
 419                                                 GrabMode.GrabModeAsync,
 420                                                 IntPtr.Zero, IntPtr.Zero/*CursorCopy.Handle*/, 0);
 421
 422                                 if (suc != 0) {
 423                                         Console.Error.WriteLine ("Could not grab pointer aborting drag.");
 424                                         drag_data.Reset ();
 425                                         return;
 426                                 }
 427
 428                                 drag_data.State = DragState.Dragging;
 429                         } else if (drag_data.State != DragState.None) {
 430                                 XAllowEvents (display, 1 /* SyncPointer */, IntPtr.Zero);
 431
 432                                 bool dnd_aware = false;
 433                                 IntPtr toplevel = IntPtr.Zero;
 434                                 IntPtr window = XplatUIX11.RootWindowHandle;
 435
 436                                 IntPtr root, child;
 437                                 int x_temp, y_temp;
 438                                 int mask_return;
 439
 440                                 while (XQueryPointer (display,
 441                                                        window,
 442                                                        out root, out child,
 443                                                        out x_temp, out y_temp,
 444                                                        out xevent.MotionEvent.x,
 445                                                        out xevent.MotionEvent.y,
 446                                                        out mask_return)) {
 447
 448                                         if (!dnd_aware) {
 449                                                 dnd_aware = IsWindowDndAware (window);
 450                                                 if (dnd_aware) {
 451                                                         toplevel = window;
 452                                                         xevent.MotionEvent.x_root = x_temp;
 453                                                         xevent.MotionEvent.y_root = y_temp;
 454                                                 }
 455                                         }
 456
 457                                         if (child == IntPtr.Zero)
 458                                                 break;
 459
 460                                         window = child;
 461                                 }
 462
 463                                 if (window != drag_data.LastWindow && drag_data.State == DragState.Entered) {
 464                                         drag_data.State = DragState.Dragging;
 465
 466                                         // TODO: Send a Leave if this is an MWF window
 467
 468                                         if (toplevel != drag_data.LastTopLevel)
 469                                                 SendLeave (drag_data.LastTopLevel, xevent.MotionEvent.window);
 470                                 }
 471
 472                                 drag_data.State = DragState.Entered;
 473                                 if (toplevel != drag_data.LastTopLevel) {
 474                                         // Entering a new toplevel window
 475                                         SendEnter (toplevel, drag_data.Window, drag_data.SupportedTypes);
 476                                 } else {
 477                                         // Already in a toplevel window, so send a position
 478                                         SendPosition (toplevel, drag_data.Window,
 479                                                         drag_data.Action,
 480                                                         xevent.MotionEvent.x_root,
 481                                                         xevent.MotionEvent.y_root,
 482                                                         xevent.MotionEvent.time);
 483                                 }
 484
 485                                 drag_data.LastTopLevel = toplevel;
 486                                 drag_data.LastWindow = window;
 487                         }
 488                 }
 489
 490                 // DEBUG CODE REMOVE
 491                 private string GetText (IntPtr handle) {
 492                         string text = String.Empty;
 493                         IntPtr  textptr;
 494
 495                         textptr = IntPtr.Zero;
 496
 497                         XFetchName (display, handle, ref textptr);
 498                         if (textptr != IntPtr.Zero) {
 499                                 text = Marshal.PtrToStringAnsi(textptr);
 500                                 XFree (textptr);
 501                         }
 502
 503                         return text;
 504                 }
 505
 506
 507                 // return true if the event is handled here
 508                 public bool HandleClientMessage (ref XEvent xevent)
 509                 {
 510                         // most common so we check it first
 511                         if (xevent.ClientMessageEvent.message_type == XdndPosition)
 512                                 return Accepting_HandlePositionEvent (ref xevent);
 513                         if (xevent.ClientMessageEvent.message_type == XdndEnter)
 514                                 return Accepting_HandleEnterEvent (ref xevent);
 515                         if (xevent.ClientMessageEvent.message_type == XdndDrop)
 516                                 return Accepting_HandleDropEvent (ref xevent);
 517                         if (xevent.ClientMessageEvent.message_type == XdndLeave)
 518                                 return Accepting_HandleLeaveEvent (ref xevent);
 519                         if (xevent.ClientMessageEvent.message_type == XdndStatus)
 520                                 return HandleStatusEvent (ref xevent);
 521
 522                         return false;
 523                 }
 524
 525                 public bool HandleSelectionNotifyEvent (ref XEvent xevent)
 526                 {
 527                         if (source != XGetSelectionOwner (display, XdndSelection))
 528                                 return false;
 529
 530                         MimeHandler handler = FindHandler ((IntPtr) xevent.SelectionEvent.target);
 531                         if (handler == null)
 532                                 return false;
 533                         if (data == null)
 534                                 data = new DataObject ();
 535
 536                         handler.Converter.GetData (this, data, ref xevent);
 537
 538                         converts_pending--;
 539                         if (converts_pending <= 0 && position_recieved) {
 540                                 drag_event = new DragEventArgs (data, 0, pos_x, pos_y,
 541                                         allowed, DragDropEffects.None);
 542                                 control.DndEnter (drag_event);
 543                                 SendStatus (source, drag_event.Effect);
 544                                 status_sent = true;
 545                         }
 546                         return true;
 547                 }
 548
 549                 public bool HandleSelectionRequestEvent (ref XEvent xevent)
 550                 {
 551                         if (xevent.SelectionRequestEvent.selection != (int) XdndSelection)
 552                                 return false;
 553
 554                         MimeHandler handler = FindHandler ((IntPtr) xevent.SelectionRequestEvent.target);
 555                         if (handler == null)
 556                                 return false;
 557
 558                         handler.Converter.SetData (this, drag_data.Data, ref xevent);
 559
 560                         return true;
 561                 }
 562
 563                 private void SetProperty (ref XEvent xevent, IntPtr data, int length)
 564                 {
 565                         XEvent sel = new XEvent();
 566                         sel.SelectionEvent.type = XEventName.SelectionNotify;
 567                         sel.SelectionEvent.send_event = true;
 568                         sel.SelectionEvent.display = display;
 569                         sel.SelectionEvent.selection = xevent.SelectionRequestEvent.selection;
 570                         sel.SelectionEvent.target = xevent.SelectionRequestEvent.target;
 571                         sel.SelectionEvent.requestor = xevent.SelectionRequestEvent.requestor;
 572                         sel.SelectionEvent.time = xevent.SelectionRequestEvent.time;
 573                         sel.SelectionEvent.property = 0;
 574
 575                         XplatUIX11.XChangeProperty (display, xevent.SelectionRequestEvent.requestor,
 576                                         xevent.SelectionRequestEvent.property,
 577                                         xevent.SelectionRequestEvent.target,
 578                                         8, PropertyMode.Replace, data, length);
 579                         sel.SelectionEvent.property = xevent.SelectionRequestEvent.property;
 580
 581                         XSendEvent (display, xevent.SelectionRequestEvent.requestor, false,
 582                                         EventMask.NoEventMask, ref sel);
 583                         return;
 584                 }
 585
 586                 private void Reset ()
 587                 {
 588                         ResetSourceData ();
 589                         ResetTargetData ();
 590                 }
 591
 592                 private void ResetSourceData ()
 593                 {
 594                         converts_pending = 0;
 595                         data = null;
 596                 }
 597
 598                 private void ResetTargetData ()
 599                 {
 600                         position_recieved = false;
 601                         status_sent = false;
 602                 }
 603
 604                 private bool Accepting_HandleEnterEvent (ref XEvent xevent)
 605                 {
 606                         Reset ();
 607
 608                         source = xevent.ClientMessageEvent.ptr1;
 609                         toplevel = xevent.AnyEvent.window;
 610                         target = IntPtr.Zero;
 611
 612                         ConvertData (ref xevent);
 613
 614                         return true;
 615                 }
 616
 617                 private bool Accepting_HandlePositionEvent (ref XEvent xevent)
 618                 {
 619                         int x = (int) xevent.ClientMessageEvent.ptr3 >> 16;
 620                         int y = (int) xevent.ClientMessageEvent.ptr3 & 0xFFFF;
 621
 622                         allowed = EffectFromAction (xevent.ClientMessageEvent.ptr5);
 623
 624                         IntPtr parent, child, new_child;
 625                         parent = XplatUIX11.XRootWindow (display, 0);
 626                         child = toplevel;
 627                         while (true) {
 628                                 int xd, yd;
 629                                 new_child = IntPtr.Zero;
 630
 631                                 if (!XplatUIX11.XTranslateCoordinates (display,
 632                                                     parent, child, x, y,
 633                                                     out xd, out yd, out new_child))
 634                                         break;
 635                                 if (new_child == IntPtr.Zero)
 636                                         break;
 637                                 child = new_child;
 638                         }
 639
 640                         if (target != child) {
 641                                 // We have moved into a new control
 642                                 // or into a control for the first time
 643                                 Finish ();
 644                         }
 645                         target = child;
 646                         Hwnd hwnd = Hwnd.ObjectFromHandle (target);
 647                         Control c = Control.FromHandle (hwnd.client_window);
 648
 649                         if (c == null)
 650                                 return true;
 651                         if (!c.allow_drop) {
 652                                 SendStatus (source, DragDropEffects.None);
 653                                 Finish ();
 654                                 return true;
 655                         }
 656
 657                         control = c;
 658                         position_recieved = true;
 659
 660                         if (converts_pending > 0)
 661                                 return true;
 662                         if (!status_sent) {
 663                                 drag_event = new DragEventArgs (data, 0, pos_x, pos_y,
 664                                         allowed, DragDropEffects.None);
 665                                 control.DndEnter (drag_event);
 666                                 SendStatus (source, drag_event.Effect);
 667                                 status_sent = true;
 668                         } else {
 669                                 SendStatus (source, drag_event.Effect);
 670                                 control.DndOver (drag_event);
 671                         }
 672
 673                         return true;
 674                 }
 675
 676                 private void Finish ()
 677                 {
 678                         if (control != null) {
 679                                 if (drag_event == null) {
 680                                         if (data == null)
 681                                                 data = new DataObject ();
 682                                         drag_event = new DragEventArgs (data,
 683                                                         0, pos_x, pos_y,
 684                                         allowed, DragDropEffects.None);
 685                                 }
 686                                 control.DndLeave (drag_event);
 687                         }
 688                         ResetTargetData ();
 689                 }
 690
 691                 private bool Accepting_HandleDropEvent (ref XEvent xevent)
 692                 {
 693                         if (control != null && drag_event != null) {
 694                                 drag_event = new DragEventArgs (data,
 695                                                 0, pos_x, pos_y,
 696                                         allowed, DragDropEffects.None);
 697                                 control.DndDrop (drag_event);
 698                         }
 699                         SendFinished ();
 700                         return true;
 701                 }
 702
 703                 private bool Accepting_HandleLeaveEvent (ref XEvent xevent)
 704                 {
 705                         if (control != null && drag_event != null)
 706                                 control.DndLeave (drag_event);
 707                         // Reset ();
 708                         return true;
 709                 }
 710
 711                 private bool HandleStatusEvent (ref XEvent xevent)
 712                 {
 713                         if (drag_data != null && drag_data.State == DragState.Entered) {
 714                                 drag_data.WillAccept = ((int) xevent.ClientMessageEvent.ptr2 & 0x1) != 0;
 715                                 Cursor cursor = CursorNo;
 716                                 if (drag_data.WillAccept) {
 717                                         // Same order as on MS
 718                                         IntPtr action = xevent.ClientMessageEvent.ptr5;
 719                                         if (action == XdndActionCopy)
 720                                                 cursor = CursorCopy;
 721                                         else if (action == XdndActionLink)
 722                                                 cursor = CursorLink;
 723                                         else if (action == XdndActionMove)
 724                                                 cursor = CursorMove;
 725
 726                                 }
 727
 728                                         // TODO: Try not to set the cursor so much
 729                                 //if (cursor.Handle != CurrentCursorHandle) {
 730                                         XChangeActivePointerGrab (display,
 731                                                         EventMask.ButtonMotionMask |
 732                                                         EventMask.PointerMotionMask |
 733                                                         EventMask.ButtonPressMask |
 734                                                         EventMask.ButtonReleaseMask,
 735                                                         cursor.Handle, IntPtr.Zero);
 736                                         CurrentCursorHandle = cursor.Handle;
 737                                         //}
 738                         }
 739                         return true;
 740                 }
 741
 742                 private DragDropEffects EffectFromAction (IntPtr action)
 743                 {
 744                         DragDropEffects allowed = DragDropEffects.None;
 745
 746                         if (action == XdndActionCopy)
 747                                 allowed = DragDropEffects.Copy;
 748                         else if (action == XdndActionMove)
 749                                 allowed |= DragDropEffects.Move;
 750                         if (action == XdndActionLink)
 751                                 allowed |= DragDropEffects.Link;
 752                         return allowed;
 753                 }
 754
 755                 private IntPtr ActionFromEffect (DragDropEffects effect)
 756                 {
 757                         IntPtr action = IntPtr.Zero;
 758
 759                         // We can't OR together actions on XDND so sadly the primary
 760                         // is the only one shown here
 761                         if ((effect & DragDropEffects.Copy) != 0)
 762                                 action = XdndActionCopy;
 763                         else if ((effect & DragDropEffects.Move) != 0)
 764                                 action = XdndActionMove;
 765                         else if ((effect & DragDropEffects.Link) != 0)
 766                                 action = XdndActionLink;
 767                         return action;
 768                 }
 769
 770                 private bool ConvertData (ref XEvent xevent)
 771                 {
 772                         bool match = false;
 773
 774                         XplatUIX11.XGetSelectionOwner (display, (int) XdndSelection);
 775
 776                         foreach (IntPtr atom in SourceSupportedList (ref xevent)) {
 777                                 MimeHandler handler = FindHandler (atom);
 778                                 if (handler == null)
 779                                         continue;
 780                                 XConvertSelection (display, XdndSelection, handler.Type,
 781                                         handler.NonProtocol, toplevel, 0 /* CurrentTime */);
 782                                 converts_pending++;
 783                                 match = true;
 784                         }
 785                         return match;
 786                 }
 787
 788                 private MimeHandler FindHandler (IntPtr atom)
 789                 {
 790                         if (atom == IntPtr.Zero)
 791                                 return null;
 792                         foreach (MimeHandler handler in MimeHandlers) {
 793                                 if (handler.Type == atom)
 794                                         return handler;
 795                         }
 796                         return null;
 797                 }
 798
 799                 private MimeHandler FindHandler (string name)
 800                 {
 801                         foreach (MimeHandler handler in MimeHandlers) {
 802                                 if (handler.Name == name)
 803                                         return handler;
 804                         }
 805                         return null;
 806                 }
 807
 808                 private void SendStatus (IntPtr source, DragDropEffects effect)
 809                 {
 810                         XEvent xevent = new XEvent ();
 811
 812                         xevent.AnyEvent.type = XEventName.ClientMessage;
 813                         xevent.AnyEvent.display = display;
 814                         xevent.ClientMessageEvent.window = source;
 815                         xevent.ClientMessageEvent.message_type = XdndStatus;
 816                         xevent.ClientMessageEvent.format = 32;
 817                         xevent.ClientMessageEvent.ptr1 = toplevel;
 818                         if (effect != DragDropEffects.None)
 819                                 xevent.ClientMessageEvent.ptr2 = (IntPtr) 1;
 820
 821                         xevent.ClientMessageEvent.ptr5 = ActionFromEffect (effect);
 822                         XSendEvent (display, source, false, 0, ref xevent);
 823                 }
 824
 825                 private void SendEnter (IntPtr handle, IntPtr from, IntPtr [] supported)
 826                 {
 827                         XEvent xevent = new XEvent ();
 828
 829                         xevent.AnyEvent.type = XEventName.ClientMessage;
 830                         xevent.AnyEvent.display = display;
 831                         xevent.ClientMessageEvent.window = handle;
 832                         xevent.ClientMessageEvent.message_type = XdndEnter;
 833                         xevent.ClientMessageEvent.format = 32;
 834                         xevent.ClientMessageEvent.ptr1 = from;
 835
 836                         // (int) xevent.ClientMessageEvent.ptr2 & 0x1)
 837                         // int ptr2 = 0x1;
 838                         // xevent.ClientMessageEvent.ptr2 = (IntPtr) ptr2;
 839                         // (e)->xclient.data.l[1] = ((e)->xclient.data.l[1] & ~(0xFF << 24)) | ((v) << 24)
 840                         xevent.ClientMessageEvent.ptr2 = (IntPtr) (XdndVersion [0] << 24);
 841
 842                         if (supported.Length > 0)
 843                                 xevent.ClientMessageEvent.ptr3 = supported [0];
 844                         if (supported.Length > 1)
 845                                 xevent.ClientMessageEvent.ptr4 = supported [1];
 846                         if (supported.Length > 2)
 847                                 xevent.ClientMessageEvent.ptr5 = supported [2];
 848
 849                         XSendEvent (display, handle, false, 0, ref xevent);
 850                 }
 851
 852                 private void SendDrop (IntPtr handle, IntPtr from, IntPtr time)
 853                 {
 854                         XEvent xevent = new XEvent ();
 855
 856                         xevent.AnyEvent.type = XEventName.ClientMessage;
 857                         xevent.AnyEvent.display = display;
 858                         xevent.ClientMessageEvent.window = handle;
 859                         xevent.ClientMessageEvent.message_type = XdndDrop;
 860                         xevent.ClientMessageEvent.format = 32;
 861                         xevent.ClientMessageEvent.ptr1 = from;
 862                         xevent.ClientMessageEvent.ptr3 = time;
 863
 864                         XSendEvent (display, handle, false, 0, ref xevent);
 865                 }
 866
 867                 private void SendPosition (IntPtr handle, IntPtr from, IntPtr action, int x, int y, IntPtr time)
 868                 {
 869                         XEvent xevent = new XEvent ();
 870
 871                         xevent.AnyEvent.type = XEventName.ClientMessage;
 872                         xevent.AnyEvent.display = display;
 873                         xevent.ClientMessageEvent.window = handle;
 874                         xevent.ClientMessageEvent.message_type = XdndPosition;
 875                         xevent.ClientMessageEvent.format = 32;
 876                         xevent.ClientMessageEvent.ptr1 = from;
 877                         xevent.ClientMessageEvent.ptr3 = (IntPtr) ((x << 16) | (y & 0xFFFF));
 878                         xevent.ClientMessageEvent.ptr4 = time;
 879                         xevent.ClientMessageEvent.ptr5 = action;
 880
 881                         XSendEvent (display, handle, false, 0, ref xevent);
 882                 }
 883
 884                 private void SendLeave (IntPtr handle, IntPtr from)
 885                 {
 886                         XEvent xevent = new XEvent ();
 887
 888                         xevent.AnyEvent.type = XEventName.ClientMessage;
 889                         xevent.AnyEvent.display = display;
 890                         xevent.ClientMessageEvent.window = handle;
 891                         xevent.ClientMessageEvent.message_type = XdndLeave;
 892                         xevent.ClientMessageEvent.format = 32;
 893                         xevent.ClientMessageEvent.ptr1 = from;
 894
 895                         XSendEvent (display, handle, false, 0, ref xevent);
 896                 }
 897
 898                 private void SendFinished ()
 899                 {
 900                         XEvent xevent = new XEvent ();
 901
 902                         xevent.AnyEvent.type = XEventName.ClientMessage;
 903                         xevent.AnyEvent.display = display;
 904                         xevent.ClientMessageEvent.window = source;
 905                         xevent.ClientMessageEvent.message_type = XdndFinished;
 906                         xevent.ClientMessageEvent.format = 32;
 907                         xevent.ClientMessageEvent.ptr1 = toplevel;
 908
 909                         XSendEvent (display, source, false, 0, ref xevent);
 910                 }
 911
 912                 // There is a somewhat decent amount of overhead
 913                 // involved in setting up dnd so we do it lazily
 914                 // as a lot of applications do not even use it.
 915                 private void Init ()
 916                 {
 917                         XdndAware = XInternAtom (display, "XdndAware", false);
 918                         XdndEnter = XInternAtom (display, "XdndEnter", false);
 919                         XdndLeave = XInternAtom (display, "XdndLeave", false);
 920                         XdndPosition = XInternAtom (display, "XdndPosition", false);
 921                         XdndStatus = XInternAtom (display, "XdndStatus", false);
 922                         XdndDrop = XInternAtom (display, "XdndDrop", false);
 923                         XdndSelection = XInternAtom (display, "XdndSelection", false);
 924                         XdndFinished = XInternAtom (display, "XdndFinished", false);
 925                         XdndTypeList = XInternAtom (display, "XdndTypeList", false);
 926                         XdndActionCopy = XInternAtom (display, "XdndActionCopy", false);
 927                         XdndActionMove = XInternAtom (display, "XdndActionMove", false);
 928                         XdndActionLink = XInternAtom (display, "XdndActionLink", false);
 929                         XdndActionPrivate = XInternAtom (display, "XdndActionPrivate", false);
 930                         XdndActionList = XInternAtom (display, "XdndActionList", false);
 931                         XdndActionDescription = XInternAtom (display, "XdndActionDescription", false);
 932                         XdndActionAsk = XInternAtom (display, "XdndActionAsk", false);
 933
 934                 foreach (MimeHandler handler in MimeHandlers) {
 935                                 handler.Type = XInternAtom (display, handler.Name, false);
 936                                 handler.NonProtocol = XInternAtom (display,
 937                                                 String.Concat ("MWFNonP+", handler.Name), false);
 938                         }
 939
 940                 }
 941
 942                 private IntPtr [] SourceSupportedList (ref XEvent xevent)
 943                 {
 944                         IntPtr [] res;
 945
 946
 947                         if (((int) xevent.ClientMessageEvent.ptr2 & 0x1) == 0) {
 948                                 res = new IntPtr [3];
 949                                 res [0] = xevent.ClientMessageEvent.ptr3;
 950                                 res [1] = xevent.ClientMessageEvent.ptr4;
 951                                 res [2] = xevent.ClientMessageEvent.ptr5;
 952                         } else {
 953                                 IntPtr type;
 954                                 int format, count, remaining;
 955                                 IntPtr data = IntPtr.Zero;
 956
 957                                 XGetWindowProperty (display, source, XdndTypeList,
 958                                                 0, 32, false, (IntPtr) Atom.XA_ATOM,
 959                                                 out type, out format, out count,
 960                                                 out remaining, out data);
 961
 962                                 res = new IntPtr [count];
 963                                 for (int i = 0; i < count; i++) {
 964                                         res [i] = (IntPtr) Marshal.ReadInt32 (data, i *
 965                                                         Marshal.SizeOf (typeof (int)));
 966                                 }
 967
 968                                 XFree (data);
 969                         }
 970
 971                         return res;
 972                 }
 973
 974                 private string GetText (ref XEvent xevent, bool unicode)
 975                 {
 976                         int nread = 0;
 977                         int nitems;
 978                         int bytes_after;
 979
 980                         StringBuilder builder = new StringBuilder ();
 981                         do {
 982                                 IntPtr actual_type;
 983                                 int actual_fmt;
 984                                 IntPtr data = IntPtr.Zero;
 985
 986                                 if (0 != XGetWindowProperty (display,
 987                                                     xevent.AnyEvent.window,
 988                                                     (IntPtr) xevent.SelectionEvent.property,
 989                                                     0, 0xffffff, false,
 990                                                     (IntPtr) Atom.AnyPropertyType, out actual_type,
 991                                                     out actual_fmt, out nitems, out bytes_after,
 992                                                     out data)) {
 993                                         XFree (data);
 994                                         break;
 995                                 }
 996
 997                                 if (unicode)
 998                                         builder.Append (Marshal.PtrToStringUni (data));
 999                                 else
1000                                         builder.Append (Marshal.PtrToStringAnsi (data));
1001                                 nread += nitems;
1002
1003                                 XFree (data);
1004                         } while (bytes_after > 0);
1005                         if (nread == 0)
1006                                 return null;
1007                         return builder.ToString ();
1008                 }
1009
1010                 private MemoryStream GetData (ref XEvent xevent)
1011                 {
1012                         int nread = 0;
1013                         int nitems;
1014                         int bytes_after;
1015
1016                         MemoryStream res = new MemoryStream ();
1017                         do {
1018                                 IntPtr actual_type;
1019                                 int actual_fmt;
1020                                 IntPtr data = IntPtr.Zero;
1021
1022                                 if (0 != XGetWindowProperty (display,
1023                                                     xevent.AnyEvent.window,
1024                                                     (IntPtr) xevent.SelectionEvent.property,
1025                                                     0, 0xffffff, false,
1026                                                     (IntPtr) Atom.AnyPropertyType, out actual_type,
1027                                                     out actual_fmt, out nitems, out bytes_after,
1028                                                     out data)) {
1029                                         XFree (data);
1030                                         break;
1031                                 }
1032
1033                                 for (int i = 0; i < nitems; i++)
1034                                         res.WriteByte (Marshal.ReadByte (data, i));
1035                                 nread += nitems;
1036
1037                                 XFree (data);
1038                         } while (bytes_after > 0);
1039                         return res;
1040                 }
1041
1042                 private Control MwfWindow (IntPtr window)
1043                 {
1044                         Hwnd hwnd = Hwnd.ObjectFromHandle (window);
1045                         if (hwnd == null)
1046                                 return null;
1047
1048                         Control res = Control.FromHandle (hwnd.client_window);
1049                         return res;
1050                 }
1051
1052                 private bool IsWindowDndAware (IntPtr handle)
1053                 {
1054                         bool res = true;
1055                         // Check the version number, we need greater than 3
1056                         IntPtr actual;
1057                         int format, count, remaining;
1058                         IntPtr data = IntPtr.Zero;
1059
1060                         XGetWindowProperty (display, handle, XdndAware, 0, 0x8000000, false,
1061                                         (IntPtr) Atom.XA_ATOM, out actual, out format,
1062                                         out count, out remaining, out data);
1063
1064                         if (actual != (IntPtr) Atom.XA_ATOM || format != 32 ||
1065                                         count == 0 || data == IntPtr.Zero) {
1066                                 if (data != IntPtr.Zero)
1067                                         XFree (data);
1068                                 return false;
1069                         }
1070
1071                         int version = Marshal.ReadInt32 (data, 0);
1072
1073                         if (version < 3) {
1074                                 Console.Error.WriteLine ("XDND Version too old (" + version + ").");
1075                                 XFree (data);
1076                                 return false;
1077                         }
1078
1079                         // First type is actually the XDND version
1080                         if (count > 1) {
1081                                 res = false;
1082                                 for (int i = 1; i < count; i++) {
1083                                         IntPtr type = (IntPtr) Marshal.ReadInt32 (data, i *
1084                                                         Marshal.SizeOf (typeof (int)));
1085                                         for (int j = 0; j < drag_data.SupportedTypes.Length; j++) {
1086                                                 if (drag_data.SupportedTypes [j] == type) {
1087                                                         res = true;
1088                                                         break;
1089                                                 }
1090                                         }
1091                                 }
1092                         }
1093
1094                         XFree (data);
1095                         return res;
1096                 }
1097
1098                 private IntPtr [] DetermineSupportedTypes (object data)
1099                 {
1100                         ArrayList res = new ArrayList ();
1101
1102                         if (data is string) {
1103                                 MimeHandler handler = FindHandler ("text/plain");
1104                                 if (handler != null)
1105                                         res.Add (handler.Type);
1106                         }/* else if (data is Bitmap)
1107                                 res.Add (data);
1108
1109                          */
1110
1111                         if (data is IDataObject) {
1112
1113
1114                         }
1115
1116                         if (data is ISerializable) {
1117                                 MimeHandler handler = FindHandler ("application/x-mono-serialized-object");
1118                                 if (handler != null)
1119                                         res.Add (handler.Type);
1120                         }
1121
1122                         return (IntPtr []) res.ToArray (typeof (IntPtr));
1123                 }
1124
1125                 [DllImport ("libX11")]
1126                 private extern static string XGetAtomName (IntPtr display, IntPtr atom);
1127
1128                 [DllImport ("libX11")]
1129                 private extern static IntPtr XInternAtom (IntPtr display, string atom_name, bool only_if_exists);
1130
1131                 [DllImport ("libX11")]
1132                 private extern static int XChangeProperty (IntPtr display, IntPtr window, IntPtr property,
1133                                 IntPtr format, int type, PropertyMode  mode, uint [] atoms, int nelements);
1134
1135                 [DllImport ("libX11")]
1136                 private extern static int XGetWindowProperty (IntPtr display, IntPtr window,
1137                                 IntPtr atom, int long_offset, int long_length, bool delete,
1138                                 IntPtr req_type, out IntPtr actual_type, out int actual_format,
1139                                 out int nitems, out int bytes_after, out IntPtr prop);
1140
1141                 [DllImport ("libX11")]
1142                 internal extern static int XSendEvent (IntPtr display, IntPtr window,
1143                                 bool propagate, EventMask event_mask, ref XEvent send_event);
1144
1145                 [DllImport ("libX11")]
1146                 internal extern static int XConvertSelection (IntPtr display, IntPtr selection,
1147                                 IntPtr target, IntPtr property, IntPtr requestor, int time);
1148
1149                 [DllImport ("libX11")]
1150                 internal extern static IntPtr XGetSelectionOwner (IntPtr display, IntPtr selection);
1151
1152                 [DllImport ("libX11")]
1153                 internal extern static int XGrabPointer (IntPtr display, IntPtr window,
1154                                 bool owner_events, EventMask event_mask, GrabMode pointer_mode,
1155                                 GrabMode keyboard_mode, IntPtr confine_to, IntPtr cursor, uint timestamp);
1156
1157                 [DllImport ("libX11")]
1158                 internal extern static bool XQueryPointer (IntPtr display, IntPtr window, out IntPtr root,
1159                                 out IntPtr child, out int root_x, out int root_y, out int win_x,
1160                                 out int win_y, out int keys_buttons);
1161
1162                 [DllImport ("libX11")]
1163                 internal extern static int XAllowEvents (IntPtr display, int event_mode, IntPtr time);
1164
1165                 [DllImport ("libX11")]
1166                 internal extern static int XFree(IntPtr data);
1167
1168                 [DllImport ("libX11")]
1169                 internal extern static int XFetchName (IntPtr display, IntPtr window, ref IntPtr window_name);
1170                 [DllImport ("libX11")]
1171                 internal extern static int XChangeActivePointerGrab (IntPtr display, EventMask event_mask, IntPtr cursor, IntPtr time);
1172         }
1173
1174 }