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                                 bool dnd_aware = false;
 431                                 IntPtr toplevel = IntPtr.Zero;
 432                                 IntPtr window = XplatUIX11.RootWindowHandle;
 433
 434                                 IntPtr root, child;
 435                                 int x_temp, y_temp;
 436                                 int mask_return;
 437
 438                                 while (XQueryPointer (display,
 439                                                        window,
 440                                                        out root, out child,
 441                                                        out x_temp, out y_temp,
 442                                                        out xevent.MotionEvent.x,
 443                                                        out xevent.MotionEvent.y,
 444                                                        out mask_return)) {
 445
 446                                         if (!dnd_aware) {
 447                                                 dnd_aware = IsWindowDndAware (window);
 448                                                 if (dnd_aware) {
 449                                                         toplevel = window;
 450                                                         xevent.MotionEvent.x_root = x_temp;
 451                                                         xevent.MotionEvent.y_root = y_temp;
 452                                                 }
 453                                         }
 454
 455                                         if (child == IntPtr.Zero)
 456                                                 break;
 457
 458                                         window = child;
 459                                 }
 460
 461                                 if (window != drag_data.LastWindow && drag_data.State == DragState.Entered) {
 462                                         drag_data.State = DragState.Dragging;
 463
 464                                         // TODO: Send a Leave if this is an MWF window
 465
 466                                         if (toplevel != drag_data.LastTopLevel)
 467                                                 SendLeave (drag_data.LastTopLevel, xevent.MotionEvent.window);
 468                                 }
 469
 470                                 drag_data.State = DragState.Entered;
 471                                 if (toplevel != drag_data.LastTopLevel) {
 472                                         // Entering a new toplevel window
 473                                         SendEnter (toplevel, drag_data.Window, drag_data.SupportedTypes);
 474                                 } else {
 475                                         // Already in a toplevel window, so send a position
 476                                         SendPosition (toplevel, drag_data.Window,
 477                                                         drag_data.Action,
 478                                                         xevent.MotionEvent.x_root,
 479                                                         xevent.MotionEvent.y_root,
 480                                                         xevent.MotionEvent.time);
 481                                 }
 482
 483                                 drag_data.LastTopLevel = toplevel;
 484                                 drag_data.LastWindow = window;
 485                         }
 486                 }
 487
 488                 // DEBUG CODE REMOVE
 489                 private string GetText (IntPtr handle) {
 490                         string text = String.Empty;
 491                         IntPtr  textptr;
 492
 493                         textptr = IntPtr.Zero;
 494
 495                         XFetchName (display, handle, ref textptr);
 496                         if (textptr != IntPtr.Zero) {
 497                                 text = Marshal.PtrToStringAnsi(textptr);
 498                                 XFree (textptr);
 499                         }
 500
 501                         return text;
 502                 }
 503
 504
 505                 // return true if the event is handled here
 506                 public bool HandleClientMessage (ref XEvent xevent)
 507                 {
 508                         // most common so we check it first
 509                         if (xevent.ClientMessageEvent.message_type == XdndPosition)
 510                                 return Accepting_HandlePositionEvent (ref xevent);
 511                         if (xevent.ClientMessageEvent.message_type == XdndEnter)
 512                                 return Accepting_HandleEnterEvent (ref xevent);
 513                         if (xevent.ClientMessageEvent.message_type == XdndDrop)
 514                                 return Accepting_HandleDropEvent (ref xevent);
 515                         if (xevent.ClientMessageEvent.message_type == XdndLeave)
 516                                 return Accepting_HandleLeaveEvent (ref xevent);
 517                         if (xevent.ClientMessageEvent.message_type == XdndStatus)
 518                                 return HandleStatusEvent (ref xevent);
 519
 520                         return false;
 521                 }
 522
 523                 public bool HandleSelectionNotifyEvent (ref XEvent xevent)
 524                 {
 525                         if (source != XGetSelectionOwner (display, XdndSelection))
 526                                 return false;
 527
 528                         MimeHandler handler = FindHandler ((IntPtr) xevent.SelectionEvent.target);
 529                         if (handler == null)
 530                                 return false;
 531                         if (data == null)
 532                                 data = new DataObject ();
 533
 534                         handler.Converter.GetData (this, data, ref xevent);
 535
 536                         converts_pending--;
 537                         if (converts_pending <= 0 && position_recieved) {
 538                                 drag_event = new DragEventArgs (data, 0, pos_x, pos_y,
 539                                         allowed, DragDropEffects.None);
 540                                 control.DndEnter (drag_event);
 541                                 SendStatus (source, drag_event.Effect);
 542                                 status_sent = true;
 543                         }
 544                         return true;
 545                 }
 546
 547                 public bool HandleSelectionRequestEvent (ref XEvent xevent)
 548                 {
 549                         if (xevent.SelectionRequestEvent.selection != (int) XdndSelection)
 550                                 return false;
 551
 552                         MimeHandler handler = FindHandler ((IntPtr) xevent.SelectionRequestEvent.target);
 553                         if (handler == null)
 554                                 return false;
 555
 556                         handler.Converter.SetData (this, drag_data.Data, ref xevent);
 557
 558                         return true;
 559                 }
 560
 561                 private void SetProperty (ref XEvent xevent, IntPtr data, int length)
 562                 {
 563                         XEvent sel = new XEvent();
 564                         sel.SelectionEvent.type = XEventName.SelectionNotify;
 565                         sel.SelectionEvent.send_event = true;
 566                         sel.SelectionEvent.display = display;
 567                         sel.SelectionEvent.selection = xevent.SelectionRequestEvent.selection;
 568                         sel.SelectionEvent.target = xevent.SelectionRequestEvent.target;
 569                         sel.SelectionEvent.requestor = xevent.SelectionRequestEvent.requestor;
 570                         sel.SelectionEvent.time = xevent.SelectionRequestEvent.time;
 571                         sel.SelectionEvent.property = 0;
 572
 573                         XplatUIX11.XChangeProperty (display, xevent.SelectionRequestEvent.requestor,
 574                                         xevent.SelectionRequestEvent.property,
 575                                         xevent.SelectionRequestEvent.target,
 576                                         8, PropertyMode.Replace, data, length);
 577                         sel.SelectionEvent.property = xevent.SelectionRequestEvent.property;
 578
 579                         XSendEvent (display, xevent.SelectionRequestEvent.requestor, false,
 580                                         EventMask.NoEventMask, ref sel);
 581                         return;
 582                 }
 583
 584                 private void Reset ()
 585                 {
 586                         ResetSourceData ();
 587                         ResetTargetData ();
 588                 }
 589
 590                 private void ResetSourceData ()
 591                 {
 592                         converts_pending = 0;
 593                         data = null;
 594                 }
 595
 596                 private void ResetTargetData ()
 597                 {
 598                         position_recieved = false;
 599                         status_sent = false;
 600                 }
 601
 602                 private bool Accepting_HandleEnterEvent (ref XEvent xevent)
 603                 {
 604                         Reset ();
 605
 606                         source = xevent.ClientMessageEvent.ptr1;
 607                         toplevel = xevent.AnyEvent.window;
 608                         target = IntPtr.Zero;
 609
 610                         ConvertData (ref xevent);
 611
 612                         return true;
 613                 }
 614
 615                 private bool Accepting_HandlePositionEvent (ref XEvent xevent)
 616                 {
 617                         int x = (int) xevent.ClientMessageEvent.ptr3 >> 16;
 618                         int y = (int) xevent.ClientMessageEvent.ptr3 & 0xFFFF;
 619
 620                         allowed = EffectFromAction (xevent.ClientMessageEvent.ptr5);
 621
 622                         IntPtr parent, child, new_child;
 623                         parent = XplatUIX11.XRootWindow (display, 0);
 624                         child = toplevel;
 625                         while (true) {
 626                                 int xd, yd;
 627                                 new_child = IntPtr.Zero;
 628
 629                                 if (!XplatUIX11.XTranslateCoordinates (display,
 630                                                     parent, child, x, y,
 631                                                     out xd, out yd, out new_child))
 632                                         break;
 633                                 if (new_child == IntPtr.Zero)
 634                                         break;
 635                                 child = new_child;
 636                         }
 637
 638                         if (target != child) {
 639                                 // We have moved into a new control
 640                                 // or into a control for the first time
 641                                 Finish ();
 642                         }
 643                         target = child;
 644                         Hwnd hwnd = Hwnd.ObjectFromHandle (target);
 645                         Control c = Control.FromHandle (hwnd.client_window);
 646
 647                         if (c == null)
 648                                 return true;
 649                         if (!c.allow_drop) {
 650                                 SendStatus (source, DragDropEffects.None);
 651                                 Finish ();
 652                                 return true;
 653                         }
 654
 655                         control = c;
 656                         position_recieved = true;
 657
 658                         if (converts_pending > 0)
 659                                 return true;
 660                         if (!status_sent) {
 661                                 drag_event = new DragEventArgs (data, 0, pos_x, pos_y,
 662                                         allowed, DragDropEffects.None);
 663                                 control.DndEnter (drag_event);
 664                                 SendStatus (source, drag_event.Effect);
 665                                 status_sent = true;
 666                         } else {
 667                                 SendStatus (source, drag_event.Effect);
 668                                 control.DndOver (drag_event);
 669                         }
 670
 671                         return true;
 672                 }
 673
 674                 private void Finish ()
 675                 {
 676                         if (control != null) {
 677                                 if (drag_event == null) {
 678                                         if (data == null)
 679                                                 data = new DataObject ();
 680                                         drag_event = new DragEventArgs (data,
 681                                                         0, pos_x, pos_y,
 682                                         allowed, DragDropEffects.None);
 683                                 }
 684                                 control.DndLeave (drag_event);
 685                         }
 686                         ResetTargetData ();
 687                 }
 688
 689                 private bool Accepting_HandleDropEvent (ref XEvent xevent)
 690                 {
 691                         if (control != null && drag_event != null) {
 692                                 drag_event = new DragEventArgs (data,
 693                                                 0, pos_x, pos_y,
 694                                         allowed, DragDropEffects.None);
 695                                 control.DndDrop (drag_event);
 696                         }
 697                         SendFinished ();
 698                         return true;
 699                 }
 700
 701                 private bool Accepting_HandleLeaveEvent (ref XEvent xevent)
 702                 {
 703                         if (control != null && drag_event != null)
 704                                 control.DndLeave (drag_event);
 705                         // Reset ();
 706                         return true;
 707                 }
 708
 709                 private bool HandleStatusEvent (ref XEvent xevent)
 710                 {
 711                         if (drag_data != null && drag_data.State == DragState.Entered) {
 712                                 drag_data.WillAccept = ((int) xevent.ClientMessageEvent.ptr2 & 0x1) != 0;
 713                                 Cursor cursor = CursorNo;
 714                                 if (drag_data.WillAccept) {
 715                                         // Same order as on MS
 716                                         IntPtr action = xevent.ClientMessageEvent.ptr5;
 717                                         if (action == XdndActionCopy)
 718                                                 cursor = CursorCopy;
 719                                         else if (action == XdndActionLink)
 720                                                 cursor = CursorLink;
 721                                         else if (action == XdndActionMove)
 722                                                 cursor = CursorMove;
 723
 724                                 }
 725
 726                                         // TODO: Try not to set the cursor so much
 727                                 //if (cursor.Handle != CurrentCursorHandle) {
 728                                         XChangeActivePointerGrab (display,
 729                                                         EventMask.ButtonMotionMask |
 730                                                         EventMask.PointerMotionMask |
 731                                                         EventMask.ButtonPressMask |
 732                                                         EventMask.ButtonReleaseMask,
 733                                                         cursor.Handle, IntPtr.Zero);
 734                                         CurrentCursorHandle = cursor.Handle;
 735                                         //}
 736                         }
 737                         return true;
 738                 }
 739
 740                 private DragDropEffects EffectFromAction (IntPtr action)
 741                 {
 742                         DragDropEffects allowed = DragDropEffects.None;
 743
 744                         if (action == XdndActionCopy)
 745                                 allowed = DragDropEffects.Copy;
 746                         else if (action == XdndActionMove)
 747                                 allowed |= DragDropEffects.Move;
 748                         if (action == XdndActionLink)
 749                                 allowed |= DragDropEffects.Link;
 750                         return allowed;
 751                 }
 752
 753                 private IntPtr ActionFromEffect (DragDropEffects effect)
 754                 {
 755                         IntPtr action = IntPtr.Zero;
 756
 757                         // We can't OR together actions on XDND so sadly the primary
 758                         // is the only one shown here
 759                         if ((effect & DragDropEffects.Copy) != 0)
 760                                 action = XdndActionCopy;
 761                         else if ((effect & DragDropEffects.Move) != 0)
 762                                 action = XdndActionMove;
 763                         else if ((effect & DragDropEffects.Link) != 0)
 764                                 action = XdndActionLink;
 765                         return action;
 766                 }
 767
 768                 private bool ConvertData (ref XEvent xevent)
 769                 {
 770                         bool match = false;
 771
 772                         XplatUIX11.XGetSelectionOwner (display, (int) XdndSelection);
 773
 774                         foreach (IntPtr atom in SourceSupportedList (ref xevent)) {
 775                                 MimeHandler handler = FindHandler (atom);
 776                                 if (handler == null)
 777                                         continue;
 778                                 XConvertSelection (display, XdndSelection, handler.Type,
 779                                         handler.NonProtocol, toplevel, 0 /* CurrentTime */);
 780                                 converts_pending++;
 781                                 match = true;
 782                         }
 783                         return match;
 784                 }
 785
 786                 private MimeHandler FindHandler (IntPtr atom)
 787                 {
 788                         if (atom == IntPtr.Zero)
 789                                 return null;
 790                         foreach (MimeHandler handler in MimeHandlers) {
 791                                 if (handler.Type == atom)
 792                                         return handler;
 793                         }
 794                         return null;
 795                 }
 796
 797                 private MimeHandler FindHandler (string name)
 798                 {
 799                         foreach (MimeHandler handler in MimeHandlers) {
 800                                 if (handler.Name == name)
 801                                         return handler;
 802                         }
 803                         return null;
 804                 }
 805
 806                 private void SendStatus (IntPtr source, DragDropEffects effect)
 807                 {
 808                         XEvent xevent = new XEvent ();
 809
 810                         xevent.AnyEvent.type = XEventName.ClientMessage;
 811                         xevent.AnyEvent.display = display;
 812                         xevent.ClientMessageEvent.window = source;
 813                         xevent.ClientMessageEvent.message_type = XdndStatus;
 814                         xevent.ClientMessageEvent.format = 32;
 815                         xevent.ClientMessageEvent.ptr1 = toplevel;
 816                         if (effect != DragDropEffects.None)
 817                                 xevent.ClientMessageEvent.ptr2 = (IntPtr) 1;
 818
 819                         xevent.ClientMessageEvent.ptr5 = ActionFromEffect (effect);
 820                         XSendEvent (display, source, false, 0, ref xevent);
 821                 }
 822
 823                 private void SendEnter (IntPtr handle, IntPtr from, IntPtr [] supported)
 824                 {
 825                         XEvent xevent = new XEvent ();
 826
 827                         xevent.AnyEvent.type = XEventName.ClientMessage;
 828                         xevent.AnyEvent.display = display;
 829                         xevent.ClientMessageEvent.window = handle;
 830                         xevent.ClientMessageEvent.message_type = XdndEnter;
 831                         xevent.ClientMessageEvent.format = 32;
 832                         xevent.ClientMessageEvent.ptr1 = from;
 833
 834                         // (int) xevent.ClientMessageEvent.ptr2 & 0x1)
 835                         // int ptr2 = 0x1;
 836                         // xevent.ClientMessageEvent.ptr2 = (IntPtr) ptr2;
 837                         // (e)->xclient.data.l[1] = ((e)->xclient.data.l[1] & ~(0xFF << 24)) | ((v) << 24)
 838                         xevent.ClientMessageEvent.ptr2 = (IntPtr) (XdndVersion [0] << 24);
 839
 840                         if (supported.Length > 0)
 841                                 xevent.ClientMessageEvent.ptr3 = supported [0];
 842                         if (supported.Length > 1)
 843                                 xevent.ClientMessageEvent.ptr4 = supported [1];
 844                         if (supported.Length > 2)
 845                                 xevent.ClientMessageEvent.ptr5 = supported [2];
 846
 847                         XSendEvent (display, handle, false, 0, ref xevent);
 848                 }
 849
 850                 private void SendDrop (IntPtr handle, IntPtr from, IntPtr time)
 851                 {
 852                         XEvent xevent = new XEvent ();
 853
 854                         xevent.AnyEvent.type = XEventName.ClientMessage;
 855                         xevent.AnyEvent.display = display;
 856                         xevent.ClientMessageEvent.window = handle;
 857                         xevent.ClientMessageEvent.message_type = XdndDrop;
 858                         xevent.ClientMessageEvent.format = 32;
 859                         xevent.ClientMessageEvent.ptr1 = from;
 860                         xevent.ClientMessageEvent.ptr3 = time;
 861
 862                         XSendEvent (display, handle, false, 0, ref xevent);
 863                 }
 864
 865                 private void SendPosition (IntPtr handle, IntPtr from, IntPtr action, int x, int y, IntPtr time)
 866                 {
 867                         XEvent xevent = new XEvent ();
 868
 869                         xevent.AnyEvent.type = XEventName.ClientMessage;
 870                         xevent.AnyEvent.display = display;
 871                         xevent.ClientMessageEvent.window = handle;
 872                         xevent.ClientMessageEvent.message_type = XdndPosition;
 873                         xevent.ClientMessageEvent.format = 32;
 874                         xevent.ClientMessageEvent.ptr1 = from;
 875                         xevent.ClientMessageEvent.ptr3 = (IntPtr) ((x << 16) | (y & 0xFFFF));
 876                         xevent.ClientMessageEvent.ptr4 = time;
 877                         xevent.ClientMessageEvent.ptr5 = action;
 878
 879                         XSendEvent (display, handle, false, 0, ref xevent);
 880                 }
 881
 882                 private void SendLeave (IntPtr handle, IntPtr from)
 883                 {
 884                         XEvent xevent = new XEvent ();
 885
 886                         xevent.AnyEvent.type = XEventName.ClientMessage;
 887                         xevent.AnyEvent.display = display;
 888                         xevent.ClientMessageEvent.window = handle;
 889                         xevent.ClientMessageEvent.message_type = XdndLeave;
 890                         xevent.ClientMessageEvent.format = 32;
 891                         xevent.ClientMessageEvent.ptr1 = from;
 892
 893                         XSendEvent (display, handle, false, 0, ref xevent);
 894                 }
 895
 896                 private void SendFinished ()
 897                 {
 898                         XEvent xevent = new XEvent ();
 899
 900                         xevent.AnyEvent.type = XEventName.ClientMessage;
 901                         xevent.AnyEvent.display = display;
 902                         xevent.ClientMessageEvent.window = source;
 903                         xevent.ClientMessageEvent.message_type = XdndFinished;
 904                         xevent.ClientMessageEvent.format = 32;
 905                         xevent.ClientMessageEvent.ptr1 = toplevel;
 906
 907                         XSendEvent (display, source, false, 0, ref xevent);
 908                 }
 909
 910                 // There is a somewhat decent amount of overhead
 911                 // involved in setting up dnd so we do it lazily
 912                 // as a lot of applications do not even use it.
 913                 private void Init ()
 914                 {
 915                         XdndAware = XInternAtom (display, "XdndAware", false);
 916                         XdndEnter = XInternAtom (display, "XdndEnter", false);
 917                         XdndLeave = XInternAtom (display, "XdndLeave", false);
 918                         XdndPosition = XInternAtom (display, "XdndPosition", false);
 919                         XdndStatus = XInternAtom (display, "XdndStatus", false);
 920                         XdndDrop = XInternAtom (display, "XdndDrop", false);
 921                         XdndSelection = XInternAtom (display, "XdndSelection", false);
 922                         XdndFinished = XInternAtom (display, "XdndFinished", false);
 923                         XdndTypeList = XInternAtom (display, "XdndTypeList", false);
 924                         XdndActionCopy = XInternAtom (display, "XdndActionCopy", false);
 925                         XdndActionMove = XInternAtom (display, "XdndActionMove", false);
 926                         XdndActionLink = XInternAtom (display, "XdndActionLink", false);
 927                         XdndActionPrivate = XInternAtom (display, "XdndActionPrivate", false);
 928                         XdndActionList = XInternAtom (display, "XdndActionList", false);
 929                         XdndActionDescription = XInternAtom (display, "XdndActionDescription", false);
 930                         XdndActionAsk = XInternAtom (display, "XdndActionAsk", false);
 931
 932                 foreach (MimeHandler handler in MimeHandlers) {
 933                                 handler.Type = XInternAtom (display, handler.Name, false);
 934                                 handler.NonProtocol = XInternAtom (display,
 935                                                 String.Concat ("MWFNonP+", handler.Name), false);
 936                         }
 937
 938                 }
 939
 940                 private IntPtr [] SourceSupportedList (ref XEvent xevent)
 941                 {
 942                         IntPtr [] res;
 943
 944
 945                         if (((int) xevent.ClientMessageEvent.ptr2 & 0x1) == 0) {
 946                                 res = new IntPtr [3];
 947                                 res [0] = xevent.ClientMessageEvent.ptr3;
 948                                 res [1] = xevent.ClientMessageEvent.ptr4;
 949                                 res [2] = xevent.ClientMessageEvent.ptr5;
 950                         } else {
 951                                 IntPtr type;
 952                                 int format, count, remaining;
 953                                 IntPtr data = IntPtr.Zero;
 954
 955                                 XGetWindowProperty (display, source, XdndTypeList,
 956                                                 0, 32, false, (IntPtr) Atom.XA_ATOM,
 957                                                 out type, out format, out count,
 958                                                 out remaining, out data);
 959
 960                                 res = new IntPtr [count];
 961                                 for (int i = 0; i < count; i++) {
 962                                         res [i] = (IntPtr) Marshal.ReadInt32 (data, i *
 963                                                         Marshal.SizeOf (typeof (int)));
 964                                 }
 965
 966                                 XFree (data);
 967                         }
 968
 969                         return res;
 970                 }
 971
 972                 private string GetText (ref XEvent xevent, bool unicode)
 973                 {
 974                         int nread = 0;
 975                         int nitems;
 976                         int bytes_after;
 977
 978                         StringBuilder builder = new StringBuilder ();
 979                         do {
 980                                 IntPtr actual_type;
 981                                 int actual_fmt;
 982                                 IntPtr data = IntPtr.Zero;
 983
 984                                 if (0 != XGetWindowProperty (display,
 985                                                     xevent.AnyEvent.window,
 986                                                     (IntPtr) xevent.SelectionEvent.property,
 987                                                     0, 0xffffff, false,
 988                                                     (IntPtr) Atom.AnyPropertyType, out actual_type,
 989                                                     out actual_fmt, out nitems, out bytes_after,
 990                                                     out data)) {
 991                                         XFree (data);
 992                                         break;
 993                                 }
 994
 995                                 if (unicode)
 996                                         builder.Append (Marshal.PtrToStringUni (data));
 997                                 else
 998                                         builder.Append (Marshal.PtrToStringAnsi (data));
 999                                 nread += nitems;
1000
1001                                 XFree (data);
1002                         } while (bytes_after > 0);
1003                         if (nread == 0)
1004                                 return null;
1005                         return builder.ToString ();
1006                 }
1007
1008                 private MemoryStream GetData (ref XEvent xevent)
1009                 {
1010                         int nread = 0;
1011                         int nitems;
1012                         int bytes_after;
1013
1014                         MemoryStream res = new MemoryStream ();
1015                         do {
1016                                 IntPtr actual_type;
1017                                 int actual_fmt;
1018                                 IntPtr data = IntPtr.Zero;
1019
1020                                 if (0 != XGetWindowProperty (display,
1021                                                     xevent.AnyEvent.window,
1022                                                     (IntPtr) xevent.SelectionEvent.property,
1023                                                     0, 0xffffff, false,
1024                                                     (IntPtr) Atom.AnyPropertyType, out actual_type,
1025                                                     out actual_fmt, out nitems, out bytes_after,
1026                                                     out data)) {
1027                                         XFree (data);
1028                                         break;
1029                                 }
1030
1031                                 for (int i = 0; i < nitems; i++)
1032                                         res.WriteByte (Marshal.ReadByte (data, i));
1033                                 nread += nitems;
1034
1035                                 XFree (data);
1036                         } while (bytes_after > 0);
1037                         return res;
1038                 }
1039
1040                 private Control MwfWindow (IntPtr window)
1041                 {
1042                         Hwnd hwnd = Hwnd.ObjectFromHandle (window);
1043                         if (hwnd == null)
1044                                 return null;
1045
1046                         Control res = Control.FromHandle (hwnd.client_window);
1047                         return res;
1048                 }
1049
1050                 private bool IsWindowDndAware (IntPtr handle)
1051                 {
1052                         bool res = true;
1053                         // Check the version number, we need greater than 3
1054                         IntPtr actual;
1055                         int format, count, remaining;
1056                         IntPtr data = IntPtr.Zero;
1057
1058                         XGetWindowProperty (display, handle, XdndAware, 0, 0x8000000, false,
1059                                         (IntPtr) Atom.XA_ATOM, out actual, out format,
1060                                         out count, out remaining, out data);
1061
1062                         if (actual != (IntPtr) Atom.XA_ATOM || format != 32 ||
1063                                         count == 0 || data == IntPtr.Zero) {
1064                                 if (data != IntPtr.Zero)
1065                                         XFree (data);
1066                                 return false;
1067                         }
1068
1069                         int version = Marshal.ReadInt32 (data, 0);
1070
1071                         if (version < 3) {
1072                                 Console.Error.WriteLine ("XDND Version too old (" + version + ").");
1073                                 XFree (data);
1074                                 return false;
1075                         }
1076
1077                         // First type is actually the XDND version
1078                         if (count > 1) {
1079                                 res = false;
1080                                 for (int i = 1; i < count; i++) {
1081                                         IntPtr type = (IntPtr) Marshal.ReadInt32 (data, i *
1082                                                         Marshal.SizeOf (typeof (int)));
1083                                         for (int j = 0; j < drag_data.SupportedTypes.Length; j++) {
1084                                                 if (drag_data.SupportedTypes [j] == type) {
1085                                                         res = true;
1086                                                         break;
1087                                                 }
1088                                         }
1089                                 }
1090                         }
1091
1092                         XFree (data);
1093                         return res;
1094                 }
1095
1096                 private IntPtr [] DetermineSupportedTypes (object data)
1097                 {
1098                         ArrayList res = new ArrayList ();
1099
1100                         if (data is string) {
1101                                 MimeHandler handler = FindHandler ("text/plain");
1102                                 if (handler != null)
1103                                         res.Add (handler.Type);
1104                         }/* else if (data is Bitmap)
1105                                 res.Add (data);
1106
1107                          */
1108
1109                         if (data is IDataObject) {
1110
1111
1112                         }
1113
1114                         if (data is ISerializable) {
1115                                 MimeHandler handler = FindHandler ("application/x-mono-serialized-object");
1116                                 if (handler != null)
1117                                         res.Add (handler.Type);
1118                         }
1119
1120                         return (IntPtr []) res.ToArray (typeof (IntPtr));
1121                 }
1122
1123                 [DllImport ("libX11")]
1124                 private extern static string XGetAtomName (IntPtr display, IntPtr atom);
1125
1126                 [DllImport ("libX11")]
1127                 private extern static IntPtr XInternAtom (IntPtr display, string atom_name, bool only_if_exists);
1128
1129                 [DllImport ("libX11")]
1130                 private extern static int XChangeProperty (IntPtr display, IntPtr window, IntPtr property,
1131                                 IntPtr format, int type, PropertyMode  mode, uint [] atoms, int nelements);
1132
1133                 [DllImport ("libX11")]
1134                 private extern static int XGetWindowProperty (IntPtr display, IntPtr window,
1135                                 IntPtr atom, int long_offset, int long_length, bool delete,
1136                                 IntPtr req_type, out IntPtr actual_type, out int actual_format,
1137                                 out int nitems, out int bytes_after, out IntPtr prop);
1138
1139                 [DllImport ("libX11")]
1140                 internal extern static int XSendEvent (IntPtr display, IntPtr window,
1141                                 bool propagate, EventMask event_mask, ref XEvent send_event);
1142
1143                 [DllImport ("libX11")]
1144                 internal extern static int XConvertSelection (IntPtr display, IntPtr selection,
1145                                 IntPtr target, IntPtr property, IntPtr requestor, int time);
1146
1147                 [DllImport ("libX11")]
1148                 internal extern static IntPtr XGetSelectionOwner (IntPtr display, IntPtr selection);
1149
1150                 [DllImport ("libX11")]
1151                 internal extern static int XGrabPointer (IntPtr display, IntPtr window,
1152                                 bool owner_events, EventMask event_mask, GrabMode pointer_mode,
1153                                 GrabMode keyboard_mode, IntPtr confine_to, IntPtr cursor, uint timestamp);
1154
1155                 [DllImport ("libX11")]
1156                 internal extern static bool XQueryPointer (IntPtr display, IntPtr window, out IntPtr root,
1157                                 out IntPtr child, out int root_x, out int root_y, out int win_x,
1158                                 out int win_y, out int keys_buttons);
1159
1160                 [DllImport ("libX11")]
1161                 internal extern static int XAllowEvents (IntPtr display, int event_mode, IntPtr time);
1162
1163                 [DllImport ("libX11")]
1164                 internal extern static int XFree(IntPtr data);
1165
1166                 [DllImport ("libX11")]
1167                 internal extern static int XFetchName (IntPtr display, IntPtr window, ref IntPtr window_name);
1168                 [DllImport ("libX11")]
1169                 internal extern static int XChangeActivePointerGrab (IntPtr display, EventMask event_mask, IntPtr cursor, IntPtr time);
1170         }
1171
1172 }