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                                 SendEnterStatus ();
 541                         return true;
 542                 }
 543
 544                 public bool HandleSelectionRequestEvent (ref XEvent xevent)
 545                 {
 546                         if (xevent.SelectionRequestEvent.selection != (int) XdndSelection)
 547                                 return false;
 548
 549                         MimeHandler handler = FindHandler ((IntPtr) xevent.SelectionRequestEvent.target);
 550                         if (handler == null)
 551                                 return false;
 552
 553                         handler.Converter.SetData (this, drag_data.Data, ref xevent);
 554
 555                         return true;
 556                 }
 557
 558                 private void SetProperty (ref XEvent xevent, IntPtr data, int length)
 559                 {
 560                         XEvent sel = new XEvent();
 561                         sel.SelectionEvent.type = XEventName.SelectionNotify;
 562                         sel.SelectionEvent.send_event = true;
 563                         sel.SelectionEvent.display = display;
 564                         sel.SelectionEvent.selection = xevent.SelectionRequestEvent.selection;
 565                         sel.SelectionEvent.target = xevent.SelectionRequestEvent.target;
 566                         sel.SelectionEvent.requestor = xevent.SelectionRequestEvent.requestor;
 567                         sel.SelectionEvent.time = xevent.SelectionRequestEvent.time;
 568                         sel.SelectionEvent.property = 0;
 569
 570                         XplatUIX11.XChangeProperty (display, xevent.SelectionRequestEvent.requestor,
 571                                         xevent.SelectionRequestEvent.property,
 572                                         xevent.SelectionRequestEvent.target,
 573                                         8, PropertyMode.Replace, data, length);
 574                         sel.SelectionEvent.property = xevent.SelectionRequestEvent.property;
 575
 576                         XSendEvent (display, xevent.SelectionRequestEvent.requestor, false,
 577                                         EventMask.NoEventMask, ref sel);
 578                         return;
 579                 }
 580
 581                 private void Reset ()
 582                 {
 583                         ResetSourceData ();
 584                         ResetTargetData ();
 585                 }
 586
 587                 private void ResetSourceData ()
 588                 {
 589                         converts_pending = 0;
 590                         data = null;
 591                 }
 592
 593                 private void ResetTargetData ()
 594                 {
 595                         position_recieved = false;
 596                         status_sent = false;
 597                 }
 598
 599                 private bool Accepting_HandleEnterEvent (ref XEvent xevent)
 600                 {
 601                         Reset ();
 602
 603                         source = xevent.ClientMessageEvent.ptr1;
 604                         toplevel = xevent.AnyEvent.window;
 605                         target = IntPtr.Zero;
 606
 607                         ConvertData (ref xevent);
 608
 609                         return true;
 610                 }
 611
 612                 private bool Accepting_HandlePositionEvent (ref XEvent xevent)
 613                 {
 614                         int x = (int) xevent.ClientMessageEvent.ptr3 >> 16;
 615                         int y = (int) xevent.ClientMessageEvent.ptr3 & 0xFFFF;
 616
 617                         allowed = EffectFromAction (xevent.ClientMessageEvent.ptr5);
 618
 619                         IntPtr parent, child, new_child;
 620                         parent = XplatUIX11.XRootWindow (display, 0);
 621                         child = toplevel;
 622                         while (true) {
 623                                 int xd, yd;
 624                                 new_child = IntPtr.Zero;
 625
 626                                 if (!XplatUIX11.XTranslateCoordinates (display,
 627                                                     parent, child, x, y,
 628                                                     out xd, out yd, out new_child))
 629                                         break;
 630                                 if (new_child == IntPtr.Zero)
 631                                         break;
 632                                 child = new_child;
 633                         }
 634
 635                         if (target != child) {
 636                                 // We have moved into a new control
 637                                 // or into a control for the first time
 638                                 Finish ();
 639                         }
 640                         target = child;
 641                         Hwnd hwnd = Hwnd.ObjectFromHandle (target);
 642                         Control c = Control.FromHandle (hwnd.client_window);
 643
 644                         if (c == null)
 645                                 return true;
 646                         if (!c.allow_drop) {
 647                                 Finish ();
 648                                 return true;
 649                         }
 650
 651                         control = c;
 652                         position_recieved = true;
 653
 654                         if (converts_pending > 0)
 655                                 return true;
 656                         if (!status_sent) {
 657                                 SendEnterStatus ();
 658                         } else {
 659                                 SendStatus ();
 660                                 control.DndOver (drag_event);
 661                         }
 662
 663                         return true;
 664                 }
 665
 666                 private void Finish ()
 667                 {
 668                         if (control != null) {
 669                                 if (drag_event == null) {
 670                                         if (data == null)
 671                                                 data = new DataObject ();
 672                                         drag_event = new DragEventArgs (data,
 673                                                         0, pos_x, pos_y,
 674                                         allowed, DragDropEffects.None);
 675                                 }
 676                                 control.DndLeave (drag_event);
 677                         }
 678                         ResetTargetData ();
 679                 }
 680
 681                 private bool Accepting_HandleDropEvent (ref XEvent xevent)
 682                 {
 683                         if (control != null && drag_event != null) {
 684                                 drag_event = new DragEventArgs (data,
 685                                                 0, pos_x, pos_y,
 686                                         allowed, DragDropEffects.None);
 687                                 control.DndDrop (drag_event);
 688                         }
 689                         SendFinished ();
 690                         return true;
 691                 }
 692
 693                 private bool Accepting_HandleLeaveEvent (ref XEvent xevent)
 694                 {
 695                         if (control != null && drag_event != null)
 696                                 control.DndLeave (drag_event);
 697                         // Reset ();
 698                         return true;
 699                 }
 700
 701                 private bool HandleStatusEvent (ref XEvent xevent)
 702                 {
 703                         if (drag_data != null && drag_data.State == DragState.Entered) {
 704                                 drag_data.WillAccept = ((int) xevent.ClientMessageEvent.ptr2 & 0x1) != 0;
 705                                 Cursor cursor = CursorNo;
 706                                 if (drag_data.WillAccept) {
 707                                         // Same order as on MS
 708                                         IntPtr action = (int) xevent.ClientMessageEvent.ptr5;
 709                                         if ((action == XdndActionCopy)
 710                                                 cursor = CursorCopy;
 711                                         else if (action == XdndActionLink)
 712                                                 cursor = CursorLink;
 713                                         else if (action == XdndActionMove)
 714                                                 cursor = CursorMove;
 715
 716                                 }
 717
 718                                         // TODO: Try not to set the cursor so much
 719                                 //if (cursor.Handle != CurrentCursorHandle) {
 720                                         XChangeActivePointerGrab (display,
 721                                                         EventMask.ButtonMotionMask |
 722                                                         EventMask.PointerMotionMask |
 723                                                         EventMask.ButtonPressMask |
 724                                                         EventMask.ButtonReleaseMask,
 725                                                         cursor.Handle, IntPtr.Zero);
 726                                         CurrentCursorHandle = cursor.Handle;
 727                                         //}
 728                         }
 729                         return true;
 730                 }
 731
 732                 private DragDropEffects EffectFromAction (IntPtr action)
 733                 {
 734                         DragDropEffects allowed = DragDropEffects.None;
 735
 736                         if (action == XdndActionCopy)
 737                                 allowed = DragDropEffects.Copy;
 738                         else if (action == XdndActionMove)
 739                                 allowed |= DragDropEffects.Move;
 740                         if (action == XdndActionLink)
 741                                 allowed |= DragDropEffects.Link;
 742                         return allowed;
 743                 }
 744
 745                 private IntPtr ActionFromEffect (DragDropEffects effect)
 746                 {
 747                         IntPtr action = IntPtr.Zero;
 748
 749                         // We can't OR together actions on XDND so sadly the primary
 750                         // is the only one shown here
 751                         if ((effect & DragDropEffects.Copy) != 0)
 752                                 action = XdndActionCopy;
 753                         else if ((effect & DragDropEffects.Move) != 0)
 754                                 action = XdndActionMove;
 755                         else if ((effect & DragDropEffects.Link) != 0)
 756                                 action = XdndActionLink;
 757                         return action;
 758                 }
 759
 760                 private bool ConvertData (ref XEvent xevent)
 761                 {
 762                         bool match = false;
 763
 764                         XplatUIX11.XGetSelectionOwner (display, (int) XdndSelection);
 765
 766                         foreach (IntPtr atom in SourceSupportedList (ref xevent)) {
 767                                 MimeHandler handler = FindHandler (atom);
 768                                 if (handler == null)
 769                                         continue;
 770                                 XConvertSelection (display, XdndSelection, handler.Type,
 771                                         handler.NonProtocol, toplevel, 0 /* CurrentTime */);
 772                                 converts_pending++;
 773                                 match = true;
 774                         }
 775                         return match;
 776                 }
 777
 778                 private MimeHandler FindHandler (IntPtr atom)
 779                 {
 780                         if (atom == IntPtr.Zero)
 781                                 return null;
 782                         foreach (MimeHandler handler in MimeHandlers) {
 783                                 if (handler.Type == atom)
 784                                         return handler;
 785                         }
 786                         return null;
 787                 }
 788
 789                 private MimeHandler FindHandler (string name)
 790                 {
 791                         foreach (MimeHandler handler in MimeHandlers) {
 792                                 if (handler.Name == name)
 793                                         return handler;
 794                         }
 795                         return null;
 796                 }
 797
 798                 private void SendStatus ()
 799                 {
 800                         XEvent xevent = new XEvent ();
 801
 802                         xevent.AnyEvent.type = XEventName.ClientMessage;
 803                         xevent.AnyEvent.display = display;
 804                         xevent.ClientMessageEvent.window = source;
 805                         xevent.ClientMessageEvent.message_type = XdndStatus;
 806                         xevent.ClientMessageEvent.format = 32;
 807                         xevent.ClientMessageEvent.ptr1 = toplevel;
 808                         if (drag_event.Effect != DragDropEffects.None)
 809                                 xevent.ClientMessageEvent.ptr2 = (IntPtr) 1;
 810
 811                         xevent.ClientMessageEvent.ptr5 = ActionFromEffect (drag_event.Effect);
 812                         XSendEvent (display, source, false, 0, ref xevent);
 813                 }
 814
 815                 private void SendEnterStatus ()
 816                 {
 817                         drag_event = new DragEventArgs (data, 0, pos_x, pos_y,
 818                                         allowed, DragDropEffects.None);
 819                         control.DndEnter (drag_event);
 820
 821                         XEvent xevent = new XEvent ();
 822
 823                         xevent.AnyEvent.type = XEventName.ClientMessage;
 824                         xevent.AnyEvent.display = display;
 825                         xevent.ClientMessageEvent.window = source;
 826                         xevent.ClientMessageEvent.message_type = XdndStatus;
 827                         xevent.ClientMessageEvent.format = 32;
 828                         xevent.ClientMessageEvent.ptr1 = toplevel;
 829                         if (drag_event.Effect != DragDropEffects.None)
 830                                 xevent.ClientMessageEvent.ptr2 = (IntPtr) 1;
 831
 832                         xevent.ClientMessageEvent.ptr5 = ActionFromEffect (drag_event.Effect);
 833                         XSendEvent (display, source, false, 0, ref xevent);
 834
 835                         status_sent = true;
 836                 }
 837
 838                 private void SendEnter (IntPtr handle, IntPtr from, IntPtr [] supported)
 839                 {
 840                         XEvent xevent = new XEvent ();
 841
 842                         xevent.AnyEvent.type = XEventName.ClientMessage;
 843                         xevent.AnyEvent.display = display;
 844                         xevent.ClientMessageEvent.window = handle;
 845                         xevent.ClientMessageEvent.message_type = XdndEnter;
 846                         xevent.ClientMessageEvent.format = 32;
 847                         xevent.ClientMessageEvent.ptr1 = from;
 848
 849                         // (int) xevent.ClientMessageEvent.ptr2 & 0x1)
 850                         // int ptr2 = 0x1;
 851                         // xevent.ClientMessageEvent.ptr2 = (IntPtr) ptr2;
 852                         // (e)->xclient.data.l[1] = ((e)->xclient.data.l[1] & ~(0xFF << 24)) | ((v) << 24)
 853                         xevent.ClientMessageEvent.ptr2 = (IntPtr) (XdndVersion [0] << 24);
 854
 855                         if (supported.Length > 0)
 856                                 xevent.ClientMessageEvent.ptr3 = supported [0];
 857                         if (supported.Length > 1)
 858                                 xevent.ClientMessageEvent.ptr4 = supported [1];
 859                         if (supported.Length > 2)
 860                                 xevent.ClientMessageEvent.ptr5 = supported [2];
 861
 862                         XSendEvent (display, handle, false, 0, ref xevent);
 863                 }
 864
 865                 private void SendDrop (IntPtr handle, IntPtr from, 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 = XdndDrop;
 873                         xevent.ClientMessageEvent.format = 32;
 874                         xevent.ClientMessageEvent.ptr1 = from;
 875                         xevent.ClientMessageEvent.ptr3 = time;
 876
 877                         XSendEvent (display, handle, false, 0, ref xevent);
 878                 }
 879
 880                 private void SendPosition (IntPtr handle, IntPtr from, IntPtr action, int x, int y, IntPtr time)
 881                 {
 882                         XEvent xevent = new XEvent ();
 883
 884                         xevent.AnyEvent.type = XEventName.ClientMessage;
 885                         xevent.AnyEvent.display = display;
 886                         xevent.ClientMessageEvent.window = handle;
 887                         xevent.ClientMessageEvent.message_type = XdndPosition;
 888                         xevent.ClientMessageEvent.format = 32;
 889                         xevent.ClientMessageEvent.ptr1 = from;
 890                         xevent.ClientMessageEvent.ptr3 = (IntPtr) ((x << 16) | (y & 0xFFFF));
 891                         xevent.ClientMessageEvent.ptr4 = time;
 892                         xevent.ClientMessageEvent.ptr5 = action;
 893
 894                         XSendEvent (display, handle, false, 0, ref xevent);
 895                 }
 896
 897                 private void SendLeave (IntPtr handle, IntPtr from)
 898                 {
 899                         XEvent xevent = new XEvent ();
 900
 901                         xevent.AnyEvent.type = XEventName.ClientMessage;
 902                         xevent.AnyEvent.display = display;
 903                         xevent.ClientMessageEvent.window = handle;
 904                         xevent.ClientMessageEvent.message_type = XdndLeave;
 905                         xevent.ClientMessageEvent.format = 32;
 906                         xevent.ClientMessageEvent.ptr1 = from;
 907
 908                         XSendEvent (display, handle, false, 0, ref xevent);
 909                 }
 910
 911                 private void SendFinished ()
 912                 {
 913                         XEvent xevent = new XEvent ();
 914
 915                         xevent.AnyEvent.type = XEventName.ClientMessage;
 916                         xevent.AnyEvent.display = display;
 917                         xevent.ClientMessageEvent.window = source;
 918                         xevent.ClientMessageEvent.message_type = XdndFinished;
 919                         xevent.ClientMessageEvent.format = 32;
 920                         xevent.ClientMessageEvent.ptr1 = toplevel;
 921
 922                         XSendEvent (display, source, false, 0, ref xevent);
 923                 }
 924
 925                 // There is a somewhat decent amount of overhead
 926                 // involved in setting up dnd so we do it lazily
 927                 // as a lot of applications do not even use it.
 928                 private void Init ()
 929                 {
 930                         XdndAware = XInternAtom (display, "XdndAware", false);
 931                         XdndEnter = XInternAtom (display, "XdndEnter", false);
 932                         XdndLeave = XInternAtom (display, "XdndLeave", false);
 933                         XdndPosition = XInternAtom (display, "XdndPosition", false);
 934                         XdndStatus = XInternAtom (display, "XdndStatus", false);
 935                         XdndDrop = XInternAtom (display, "XdndDrop", false);
 936                         XdndSelection = XInternAtom (display, "XdndSelection", false);
 937                         XdndFinished = XInternAtom (display, "XdndFinished", false);
 938                         XdndTypeList = XInternAtom (display, "XdndTypeList", false);
 939                         XdndActionCopy = XInternAtom (display, "XdndActionCopy", false);
 940                         XdndActionMove = XInternAtom (display, "XdndActionMove", false);
 941                         XdndActionLink = XInternAtom (display, "XdndActionLink", false);
 942                         XdndActionPrivate = XInternAtom (display, "XdndActionPrivate", false);
 943                         XdndActionList = XInternAtom (display, "XdndActionList", false);
 944                         XdndActionDescription = XInternAtom (display, "XdndActionDescription", false);
 945                         XdndActionAsk = XInternAtom (display, "XdndActionAsk", false);
 946
 947                 foreach (MimeHandler handler in MimeHandlers) {
 948                                 handler.Type = XInternAtom (display, handler.Name, false);
 949                                 handler.NonProtocol = XInternAtom (display,
 950                                                 String.Concat ("MWFNonP+", handler.Name), false);
 951                         }
 952
 953                 }
 954
 955                 private IntPtr [] SourceSupportedList (ref XEvent xevent)
 956                 {
 957                         IntPtr [] res;
 958
 959
 960                         if (((int) xevent.ClientMessageEvent.ptr2 & 0x1) == 0) {
 961                                 res = new IntPtr [3];
 962                                 res [0] = xevent.ClientMessageEvent.ptr3;
 963                                 res [1] = xevent.ClientMessageEvent.ptr4;
 964                                 res [2] = xevent.ClientMessageEvent.ptr5;
 965                         } else {
 966                                 IntPtr type;
 967                                 int format, count, remaining;
 968                                 IntPtr data = IntPtr.Zero;
 969
 970                                 XGetWindowProperty (display, source, XdndTypeList,
 971                                                 0, 32, false, (IntPtr) Atom.XA_ATOM,
 972                                                 out type, out format, out count,
 973                                                 out remaining, out data);
 974
 975                                 res = new IntPtr [count];
 976                                 for (int i = 0; i < count; i++) {
 977                                         res [i] = (IntPtr) Marshal.ReadInt32 (data, i *
 978                                                         Marshal.SizeOf (typeof (int)));
 979                                 }
 980
 981                                 XFree (data);
 982                         }
 983
 984                         return res;
 985                 }
 986
 987                 private string GetText (ref XEvent xevent, bool unicode)
 988                 {
 989                         int nread = 0;
 990                         int nitems;
 991                         int bytes_after;
 992
 993                         StringBuilder builder = new StringBuilder ();
 994                         do {
 995                                 IntPtr actual_type;
 996                                 int actual_fmt;
 997                                 IntPtr data = IntPtr.Zero;
 998
 999                                 if (0 != XGetWindowProperty (display,
1000                                                     xevent.AnyEvent.window,
1001                                                     (IntPtr) xevent.SelectionEvent.property,
1002                                                     0, 0xffffff, false,
1003                                                     (IntPtr) Atom.AnyPropertyType, out actual_type,
1004                                                     out actual_fmt, out nitems, out bytes_after,
1005                                                     out data)) {
1006                                         XFree (data);
1007                                         break;
1008                                 }
1009
1010                                 if (unicode)
1011                                         builder.Append (Marshal.PtrToStringUni (data));
1012                                 else
1013                                         builder.Append (Marshal.PtrToStringAnsi (data));
1014                                 nread += nitems;
1015
1016                                 XFree (data);
1017                         } while (bytes_after > 0);
1018                         if (nread == 0)
1019                                 return null;
1020                         return builder.ToString ();
1021                 }
1022
1023                 private MemoryStream GetData (ref XEvent xevent)
1024                 {
1025                         int nread = 0;
1026                         int nitems;
1027                         int bytes_after;
1028
1029                         MemoryStream res = new MemoryStream ();
1030                         do {
1031                                 IntPtr actual_type;
1032                                 int actual_fmt;
1033                                 IntPtr data = IntPtr.Zero;
1034
1035                                 if (0 != XGetWindowProperty (display,
1036                                                     xevent.AnyEvent.window,
1037                                                     (IntPtr) xevent.SelectionEvent.property,
1038                                                     0, 0xffffff, false,
1039                                                     (IntPtr) Atom.AnyPropertyType, out actual_type,
1040                                                     out actual_fmt, out nitems, out bytes_after,
1041                                                     out data)) {
1042                                         XFree (data);
1043                                         break;
1044                                 }
1045
1046                                 for (int i = 0; i < nitems; i++)
1047                                         res.WriteByte (Marshal.ReadByte (data, i));
1048                                 nread += nitems;
1049
1050                                 XFree (data);
1051                         } while (bytes_after > 0);
1052                         return res;
1053                 }
1054
1055                 private Control MwfWindow (IntPtr window)
1056                 {
1057                         Hwnd hwnd = Hwnd.ObjectFromHandle (window);
1058                         if (hwnd == null)
1059                                 return null;
1060
1061                         Control res = Control.FromHandle (hwnd.client_window);
1062                         return res;
1063                 }
1064
1065                 private bool IsWindowDndAware (IntPtr handle)
1066                 {
1067                         bool res = true;
1068                         // Check the version number, we need greater than 3
1069                         IntPtr actual;
1070                         int format, count, remaining;
1071                         IntPtr data = IntPtr.Zero;
1072
1073                         XGetWindowProperty (display, handle, XdndAware, 0, 0x8000000, false,
1074                                         (IntPtr) Atom.XA_ATOM, out actual, out format,
1075                                         out count, out remaining, out data);
1076
1077                         if (actual != (IntPtr) Atom.XA_ATOM || format != 32 ||
1078                                         count == 0 || data == IntPtr.Zero) {
1079                                 if (data != IntPtr.Zero)
1080                                         XFree (data);
1081                                 return false;
1082                         }
1083
1084                         int version = Marshal.ReadInt32 (data, 0);
1085
1086                         if (version < 3) {
1087                                 Console.Error.WriteLine ("XDND Version too old (" + version + ").");
1088                                 XFree (data);
1089                                 return false;
1090                         }
1091
1092                         // First type is actually the XDND version
1093                         if (count > 1) {
1094                                 res = false;
1095                                 for (int i = 1; i < count; i++) {
1096                                         IntPtr type = (IntPtr) Marshal.ReadInt32 (data, i *
1097                                                         Marshal.SizeOf (typeof (int)));
1098                                         for (int j = 0; j < drag_data.SupportedTypes.Length; j++) {
1099                                                 if (drag_data.SupportedTypes [j] == type) {
1100                                                         res = true;
1101                                                         break;
1102                                                 }
1103                                         }
1104                                 }
1105                         }
1106
1107                         XFree (data);
1108                         return res;
1109                 }
1110
1111                 private IntPtr [] DetermineSupportedTypes (object data)
1112                 {
1113                         ArrayList res = new ArrayList ();
1114
1115                         if (data is string) {
1116                                 MimeHandler handler = FindHandler ("text/plain");
1117                                 if (handler != null)
1118                                         res.Add (handler.Type);
1119                         }/* else if (data is Bitmap)
1120                                 res.Add (data);
1121
1122                          */
1123
1124                         if (data is IDataObject) {
1125
1126
1127                         }
1128
1129                         if (data is ISerializable) {
1130                                 MimeHandler handler = FindHandler ("application/x-mono-serialized-object");
1131                                 if (handler != null)
1132                                         res.Add (handler.Type);
1133                         }
1134
1135                         return (IntPtr []) res.ToArray (typeof (IntPtr));
1136                 }
1137
1138                 [DllImport ("libX11")]
1139                 private extern static string XGetAtomName (IntPtr display, IntPtr atom);
1140
1141                 [DllImport ("libX11")]
1142                 private extern static IntPtr XInternAtom (IntPtr display, string atom_name, bool only_if_exists);
1143
1144                 [DllImport ("libX11")]
1145                 private extern static int XChangeProperty (IntPtr display, IntPtr window, IntPtr property,
1146                                 IntPtr format, int type, PropertyMode  mode, uint [] atoms, int nelements);
1147
1148                 [DllImport ("libX11")]
1149                 private extern static int XGetWindowProperty (IntPtr display, IntPtr window,
1150                                 IntPtr atom, int long_offset, int long_length, bool delete,
1151                                 IntPtr req_type, out IntPtr actual_type, out int actual_format,
1152                                 out int nitems, out int bytes_after, out IntPtr prop);
1153
1154                 [DllImport ("libX11")]
1155                 internal extern static int XSendEvent (IntPtr display, IntPtr window,
1156                                 bool propagate, EventMask event_mask, ref XEvent send_event);
1157
1158                 [DllImport ("libX11")]
1159                 internal extern static int XConvertSelection (IntPtr display, IntPtr selection,
1160                                 IntPtr target, IntPtr property, IntPtr requestor, int time);
1161
1162                 [DllImport ("libX11")]
1163                 internal extern static IntPtr XGetSelectionOwner (IntPtr display, IntPtr selection);
1164
1165                 [DllImport ("libX11")]
1166                 internal extern static int XGrabPointer (IntPtr display, IntPtr window,
1167                                 bool owner_events, EventMask event_mask, GrabMode pointer_mode,
1168                                 GrabMode keyboard_mode, IntPtr confine_to, IntPtr cursor, uint timestamp);
1169
1170                 [DllImport ("libX11")]
1171                 internal extern static bool XQueryPointer (IntPtr display, IntPtr window, out IntPtr root,
1172                                 out IntPtr child, out int root_x, out int root_y, out int win_x,
1173                                 out int win_y, out int keys_buttons);
1174
1175                 [DllImport ("libX11")]
1176                 internal extern static int XAllowEvents (IntPtr display, int event_mode, IntPtr time);
1177
1178                 [DllImport ("libX11")]
1179                 internal extern static int XFree(IntPtr data);
1180
1181                 [DllImport ("libX11")]
1182                 internal extern static int XFetchName (IntPtr display, IntPtr window, ref IntPtr window_name);
1183                 [DllImport ("libX11")]
1184                 internal extern static int XChangeActivePointerGrab (IntPtr display, EventMask event_mask, IntPtr cursor, IntPtr time);
1185         }
1186
1187 }