mcs/class/System.Windows.Forms/System.Windows.Forms/Hwnd.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) 2005-2006 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Peter Bartok    (pbartok@novell.com)
  24 //
  25 //
  26
  27 // NOT COMPLETE
  28
  29 using System;
  30 using System.Collections;
  31 using System.Drawing;
  32 using System.Runtime.InteropServices;
  33
  34 // NOTE: Possible optimization:
  35 // Several properties calculate dimensions on the fly; instead; they can
  36 // be stored in a field and only be recalculated when a style is changed (DefaultClientRect, for example)
  37
  38 namespace System.Windows.Forms {
  39         internal class Hwnd : IDisposable {
  40                 #region Local Variables
  41                 private static Hashtable        windows = new Hashtable(100, 0.5f);
  42                 //private const int     menu_height = 14;                       // FIXME - Read this value from somewhere
  43
  44                 private IntPtr          handle;
  45                 internal IntPtr         client_window;
  46                 internal IntPtr         whole_window;
  47                 internal IntPtr         cursor;
  48                 internal Menu           menu;
  49                 internal TitleStyle     title_style;
  50                 internal FormBorderStyle        border_style;
  51                 internal bool           border_static;
  52                 internal int            x;
  53                 internal int            y;
  54                 internal int            width;
  55                 internal int            height;
  56                 internal bool           allow_drop;
  57                 internal Hwnd           parent;
  58                 internal bool           visible;
  59                 internal bool           mapped;
  60                 internal uint           opacity;
  61                 internal bool           enabled;
  62                 internal bool           zero_sized;
  63                 internal ArrayList      invalid_list;
  64                 internal Rectangle      nc_invalid;
  65                 internal bool           expose_pending;
  66                 internal bool           nc_expose_pending;
  67                 internal bool           configure_pending;
  68                 internal bool           resizing_or_moving; // Used by the X11 backend to track form resize/move
  69                 internal bool           reparented;
  70                 internal Stack          drawing_stack;
  71                 internal object         user_data;
  72                 internal Rectangle      client_rectangle;
  73                 internal ArrayList      marshal_free_list;
  74                 internal int            caption_height;
  75                 internal int            tool_caption_height;
  76                 internal bool           whacky_wm;
  77                 internal bool           fixed_size;
  78                 internal bool           zombie; /* X11 only flag.  true if the X windows have been destroyed but we haven't been Disposed */
  79                 internal bool           topmost; /* X11 only. */
  80                 internal Region         user_clip;
  81                 internal XEventQueue    queue;
  82                 internal WindowExStyles initial_ex_style;
  83                 internal WindowStyles   initial_style;
  84                 internal FormWindowState cached_window_state = (FormWindowState)(-1);  /* X11 only field */
  85                 internal Point          previous_child_startup_location = new Point (int.MinValue, int.MinValue);
  86                 static internal Point   previous_main_startup_location = new Point (int.MinValue, int.MinValue);
  87                 internal ArrayList children;
  88
  89                 [ThreadStatic]
  90                 private static Bitmap bmp;
  91                 [ThreadStatic]
  92                 private static Graphics bmp_g;
  93                 #endregion      // Local Variables
  94
  95                 // locks for some operations (used in XplatUIX11.cs)
  96                 internal object configure_lock = new object ();
  97                 internal object expose_lock = new object ();
  98
  99                 #region Constructors and destructors
 100                 public Hwnd() {
 101                         x = 0;
 102                         y = 0;
 103                         width = 0;
 104                         height = 0;
 105                         visible = false;
 106                         menu = null;
 107                         border_style = FormBorderStyle.None;
 108                         client_window = IntPtr.Zero;
 109                         whole_window = IntPtr.Zero;
 110                         cursor = IntPtr.Zero;
 111                         handle = IntPtr.Zero;
 112                         parent = null;
 113                         invalid_list = new ArrayList();
 114                         expose_pending = false;
 115                         nc_expose_pending = false;
 116                         enabled = true;
 117                         reparented = false;
 118                         client_rectangle = Rectangle.Empty;
 119                         marshal_free_list = new ArrayList(2);
 120                         opacity = 0xffffffff;
 121                         fixed_size = false;
 122                         drawing_stack = new Stack ();
 123                         children = new ArrayList ();
 124                         resizing_or_moving = false;
 125                         whacky_wm = false;
 126                         topmost = false;
 127                 }
 128
 129                 public void Dispose() {
 130                         expose_pending = false;
 131                         nc_expose_pending = false;
 132                         Parent = null;
 133                         lock (windows) {
 134                                 windows.Remove(client_window);
 135                                 windows.Remove(whole_window);
 136                         }
 137                         client_window = IntPtr.Zero;
 138                         whole_window = IntPtr.Zero;
 139                         zombie = false;
 140                         for (int i = 0; i < marshal_free_list.Count; i++) {
 141                                 Marshal.FreeHGlobal((IntPtr)marshal_free_list[i]);
 142                         }
 143                         marshal_free_list.Clear();
 144                 }
 145                 #endregion
 146
 147                 #region Static Methods
 148                 public static Hwnd ObjectFromWindow(IntPtr window) {
 149                         Hwnd rv;
 150                         lock (windows) {
 151                                 rv = (Hwnd)windows[window];
 152                         }
 153                         return rv;
 154                 }
 155
 156                 public static Hwnd ObjectFromHandle(IntPtr handle) {
 157                         //return (Hwnd)(((GCHandle)handle).Target);
 158                         Hwnd rv;
 159                         lock (windows) {
 160                                 rv = (Hwnd)windows[handle];
 161                         }
 162                         return rv;
 163                 }
 164
 165                 public static IntPtr HandleFromObject(Hwnd obj) {
 166                         return obj.handle;
 167                 }
 168
 169                 public static Hwnd GetObjectFromWindow(IntPtr window) {
 170                         Hwnd rv;
 171                         lock (windows) {
 172                                 rv = (Hwnd)windows[window];
 173                         }
 174                         return rv;
 175                 }
 176
 177                 public static IntPtr GetHandleFromWindow(IntPtr window) {
 178                         Hwnd    hwnd;
 179
 180                         lock (windows) {
 181                                 hwnd = (Hwnd)windows[window];
 182                         }
 183                         if (hwnd != null) {
 184                                 return hwnd.handle;
 185                         } else {
 186                                 return IntPtr.Zero;
 187                         }
 188                 }
 189
 190                 public static Borders GetBorderWidth (CreateParams cp)
 191                 {
 192                         Borders border_size = new Borders ();
 193
 194                         Size windowborder = ThemeEngine.Current.BorderSize; /*new Size (1, 1);*/ // This is the only one that can be changed from the display properties in windows.
 195                         Size border = ThemeEngine.Current.BorderStaticSize; /*new Size (1, 1);*/
 196                         Size clientedge = ThemeEngine.Current.Border3DSize; /*new Size (2, 2);*/
 197                         Size thickframe = new Size (2 + windowborder.Width, 2 + windowborder.Height);
 198                         Size dialogframe = ThemeEngine.Current.BorderSizableSize; /* new Size (3, 3);*/
 199
 200                         if (cp.IsSet (WindowStyles.WS_CAPTION)) {
 201                                 border_size.Inflate (dialogframe);
 202                         } else if (cp.IsSet (WindowStyles.WS_BORDER)) {
 203                                 if (cp.IsSet (WindowExStyles.WS_EX_DLGMODALFRAME)) {
 204                                         if (cp.IsSet (WindowStyles.WS_THICKFRAME) && (cp.IsSet (WindowExStyles.WS_EX_STATICEDGE) || cp.IsSet (WindowExStyles.WS_EX_CLIENTEDGE))) {
 205                                                 border_size.Inflate (border);
 206                                         }
 207                                 } else {
 208                                         border_size.Inflate (border);
 209                                 }
 210                         } else if (cp.IsSet (WindowStyles.WS_DLGFRAME)) {
 211                                 border_size.Inflate (dialogframe);
 212                         }
 213
 214                         if (cp.IsSet (WindowStyles.WS_THICKFRAME)) {
 215                                 if (cp.IsSet (WindowStyles.WS_DLGFRAME)) {
 216                                         border_size.Inflate (border);
 217                                 } else {
 218                                         border_size.Inflate (thickframe);
 219                                 }
 220                         }
 221
 222                         bool only_small_border;
 223                         Size small_border = Size.Empty;
 224
 225                         only_small_border = cp.IsSet (WindowStyles.WS_THICKFRAME) || cp.IsSet (WindowStyles.WS_DLGFRAME);
 226                         if (only_small_border && cp.IsSet (WindowStyles.WS_THICKFRAME) && !cp.IsSet (WindowStyles.WS_BORDER) && !cp.IsSet (WindowStyles.WS_DLGFRAME)) {
 227                                 small_border = border;
 228                         }
 229
 230                         if (cp.IsSet (WindowExStyles.WS_EX_CLIENTEDGE | WindowExStyles.WS_EX_DLGMODALFRAME)) {
 231                                 border_size.Inflate (clientedge + (only_small_border ? small_border : dialogframe));
 232                         } else if (cp.IsSet (WindowExStyles.WS_EX_STATICEDGE | WindowExStyles.WS_EX_DLGMODALFRAME)) {
 233                                 border_size.Inflate (only_small_border ? small_border : dialogframe);
 234                         } else if (cp.IsSet (WindowExStyles.WS_EX_STATICEDGE | WindowExStyles.WS_EX_CLIENTEDGE)) {
 235                                 border_size.Inflate (border + (only_small_border ? Size.Empty : clientedge));
 236                         } else {
 237                                 if (cp.IsSet (WindowExStyles.WS_EX_CLIENTEDGE)) {
 238                                         border_size.Inflate (clientedge);
 239                                 }
 240                                 if (cp.IsSet (WindowExStyles.WS_EX_DLGMODALFRAME) && !cp.IsSet (WindowStyles.WS_DLGFRAME)) {
 241                                         border_size.Inflate (cp.IsSet (WindowStyles.WS_THICKFRAME) ? border : dialogframe);
 242                                 }
 243                                 if (cp.IsSet (WindowExStyles.WS_EX_STATICEDGE)) {
 244                                         if (cp.IsSet (WindowStyles.WS_THICKFRAME) || cp.IsSet (WindowStyles.WS_DLGFRAME)) {
 245                                                 border_size.Inflate (new Size (-border.Width, -border.Height));
 246                                         } else {
 247                                                 border_size.Inflate (border);
 248                                         }
 249                                 }
 250                         }
 251
 252                         return border_size;
 253                 }
 254
 255                 public static Rectangle GetWindowRectangle (CreateParams cp, Menu menu)
 256                 {
 257                         return GetWindowRectangle (cp, menu, Rectangle.Empty);
 258                 }
 259
 260                 public static Rectangle GetWindowRectangle (CreateParams cp, Menu menu, Rectangle client_rect)
 261                 {
 262                         Rectangle rect;
 263                         Borders borders;
 264
 265                         borders = GetBorders (cp, menu);
 266
 267                         rect = new Rectangle (Point.Empty, client_rect.Size);
 268                         rect.Y -= borders.top;
 269                         rect.Height += borders.top + borders.bottom;
 270                         rect.X -= borders.left;
 271                         rect.Width += borders.left + borders.right;
 272
 273 #if debug
 274                         Console.WriteLine ("GetWindowRectangle ({0}, {1}, {2}): {3}", cp, menu != null, client_rect, rect);
 275 #endif
 276                         return rect;
 277                 }
 278
 279                 public Rectangle GetClientRectangle (int width, int height)
 280                 {
 281                         CreateParams cp = new CreateParams ();
 282                         cp.WindowStyle = initial_style;
 283                         cp.WindowExStyle = initial_ex_style;
 284                         return GetClientRectangle (cp, menu, width, height);
 285                 }
 286
 287                 // This could be greatly optimized by caching the outputs and only updating when something is moved
 288                 // in the parent planar space.  To do that we need to track z-order in the parent space as well
 289                 public ArrayList GetClippingRectangles ()
 290                 {
 291                         ArrayList masks = new ArrayList ();
 292
 293                         if (x < 0) {
 294                                 masks.Add (new Rectangle (0, 0, x*-1, Height));
 295                                 if (y < 0) {
 296                                         masks.Add (new Rectangle (x*-1, 0, Width, y*-1));
 297                                 }
 298                         } else if (y < 0) {
 299                                 masks.Add (new Rectangle (0, 0, Width, y*-1));
 300                         }
 301
 302                         foreach (Hwnd child in children) {
 303                                 if (child.visible)
 304                                         masks.Add (new Rectangle (child.X, child.Y, child.Width, child.Height));
 305                         }
 306
 307                         if (parent == null) {
 308                                 return masks;
 309                         }
 310
 311                         ArrayList siblings = parent.children;
 312
 313                         foreach (Hwnd sibling in siblings) {
 314                                 IntPtr sibling_handle = whole_window;
 315
 316                                 if (sibling == this)
 317                                         continue;
 318
 319                                 // This entire method should be cached to find all higher views at the time of query
 320                                 do {
 321                                         sibling_handle = XplatUI.GetPreviousWindow (sibling_handle);
 322
 323                                         if (sibling_handle == sibling.WholeWindow && sibling.visible) {
 324
 325                                                 Rectangle intersect = Rectangle.Intersect (new Rectangle (X, Y, Width, Height), new Rectangle (sibling.X, sibling.Y, sibling.Width, sibling.Height));
 326
 327                                                 if (intersect == Rectangle.Empty)
 328                                                         continue;
 329
 330                                                 intersect.X -= X;
 331                                                 intersect.Y -= Y;
 332
 333                                                 masks.Add (intersect);
 334                                         }
 335                                 } while (sibling_handle != IntPtr.Zero);
 336                         }
 337
 338                         return masks;
 339                 }
 340
 341                 public static Borders GetBorders (CreateParams cp, Menu menu)
 342                 {
 343
 344                         Borders borders = new Borders ();
 345
 346                         if (menu != null) {
 347                                 int menu_height = menu.Rect.Height;
 348                                 if (menu_height == 0)
 349                                         menu_height = ThemeEngine.Current.CalcMenuBarSize (GraphicsContext, menu, cp.Width);
 350                                 borders.top += menu_height;
 351                         }
 352
 353                         if (cp.IsSet (WindowStyles.WS_CAPTION)) {
 354                                 int caption_height;
 355                                 if (cp.IsSet (WindowExStyles.WS_EX_TOOLWINDOW)) {
 356                                         caption_height = ThemeEngine.Current.ToolWindowCaptionHeight;
 357                                 } else {
 358                                         caption_height = ThemeEngine.Current.CaptionHeight;
 359                                 }
 360                                 borders.top += caption_height;
 361                         }
 362
 363                         Borders border_width = GetBorderWidth (cp);
 364
 365                         borders.left += border_width.left;
 366                         borders.right += border_width.right;
 367                         borders.top += border_width.top;
 368                         borders.bottom += border_width.bottom;
 369
 370                         return borders;
 371                 }
 372
 373                 public static Rectangle GetClientRectangle(CreateParams cp, Menu menu, int width, int height) {
 374                         Rectangle rect;
 375                         Borders borders;
 376
 377                         borders = GetBorders (cp, menu);
 378
 379                         rect = new Rectangle(0, 0, width, height);
 380                         rect.Y += borders.top;
 381                         rect.Height -= borders.top + borders.bottom;
 382                         rect.X += borders.left;
 383                         rect.Width -= borders.left + borders.right;
 384
 385 #if debug
 386                         Console.WriteLine ("GetClientRectangle ({0}, {1}, {2}, {3}): {4}", cp, menu != null, width, height, rect);
 387 #endif
 388
 389                         return rect;
 390                 }
 391
 392                 public static Graphics GraphicsContext {
 393                         get {
 394                                 if (bmp_g == null) {
 395                                         bmp = new Bitmap (1, 1, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
 396                                         bmp_g = Graphics.FromImage (bmp);
 397                                 }
 398
 399                                 return bmp_g;
 400                         }
 401                 }
 402                 #endregion      // Static Methods
 403
 404                 #region Instance Properties
 405                 public FormBorderStyle BorderStyle {
 406                         get {
 407                                 return border_style;
 408                         }
 409
 410                         set {
 411                                 border_style = value;
 412                         }
 413                 }
 414
 415                 public Rectangle ClientRect {
 416                         get {
 417                                 if (client_rectangle == Rectangle.Empty) {
 418                                         return DefaultClientRect;
 419                                 }
 420                                 return client_rectangle;
 421                         }
 422
 423                         set {
 424                                 client_rectangle = value;
 425                         }
 426                 }
 427
 428                 public IntPtr Cursor {
 429                         get {
 430                                 return cursor;
 431                         }
 432
 433                         set {
 434                                 cursor = value;
 435                         }
 436                 }
 437
 438                 public IntPtr ClientWindow {
 439                         get {
 440                                 return client_window;
 441                         }
 442
 443                         set {
 444                                 client_window = value;
 445                                 handle = value;
 446
 447                                 zombie = false;
 448
 449                                 if (client_window != IntPtr.Zero) {
 450                                         lock (windows) {
 451                                                 if (windows[client_window] == null) {
 452                                                         windows[client_window] = this;
 453                                                 }
 454                                         }
 455                                 }
 456                         }
 457                 }
 458
 459                 public Region UserClip {
 460                         get {
 461                                 return user_clip;
 462                         }
 463
 464                         set {
 465                                 user_clip = value;
 466                         }
 467                 }
 468
 469                 public Rectangle DefaultClientRect {
 470                         get {
 471                                 // We pass a Zero for the menu handle so the menu size is
 472                                 // not computed this is done via an WM_NCCALC
 473                                 CreateParams cp = new CreateParams ();
 474                                 Rectangle rect;
 475
 476                                 cp.WindowStyle = initial_style;
 477                                 cp.WindowExStyle = initial_ex_style;
 478
 479                                 rect = GetClientRectangle (cp, null, width, height);
 480
 481                                 return rect;
 482                         }
 483                 }
 484
 485                 public bool ExposePending {
 486                         get {
 487                                 return expose_pending;
 488                         }
 489                 }
 490
 491                 public IntPtr Handle {
 492                         get {
 493                                 if (handle == IntPtr.Zero) {
 494                                         throw new ArgumentNullException("Handle", "Handle is not yet assigned, need a ClientWindow");
 495                                 }
 496                                 return handle;
 497                         }
 498                 }
 499
 500                 public int Height {
 501                         get {
 502                                 return height;
 503                         }
 504
 505                         set {
 506                                 height = value;
 507                         }
 508                 }
 509
 510                 public Menu Menu {
 511                         get {
 512                                 return menu;
 513                         }
 514
 515                         set {
 516                                 menu = value;
 517                         }
 518                 }
 519
 520                 public bool Reparented {
 521                         get {
 522                                 return reparented;
 523                         }
 524
 525                         set {
 526                                 reparented = value;
 527                         }
 528                 }
 529
 530                 public uint Opacity {
 531                         get {
 532                                 return opacity;
 533                         }
 534
 535                         set {
 536                                 opacity = value;
 537                         }
 538                 }
 539
 540                 public XEventQueue Queue {
 541                         get {
 542                                 return queue;
 543                         }
 544
 545                         set {
 546                                 queue = value;
 547                         }
 548                 }
 549
 550                 public bool Enabled {
 551                         get {
 552                                 if (!enabled) {
 553                                         return false;
 554                                 }
 555
 556                                 if (parent != null) {
 557                                         return parent.Enabled;
 558                                 }
 559
 560                                 return true;
 561                         }
 562
 563                         set {
 564                                 enabled = value;
 565                         }
 566                 }
 567
 568                 public IntPtr EnabledHwnd {
 569                         get {
 570                                 if (Enabled || parent == null) {
 571                                         return Handle;
 572                                 }
 573
 574                                 return parent.EnabledHwnd;
 575                         }
 576                 }
 577
 578                 public Point MenuOrigin {
 579                         get {
 580                                 Form frm = Control.FromHandle (handle) as Form;
 581                                 if (frm != null && frm.window_manager != null)
 582                                         return frm.window_manager.GetMenuOrigin ();
 583
 584                                 Point   pt;
 585                                 Size    border_3D_size = ThemeEngine.Current.Border3DSize;
 586
 587                                 pt = new Point(0, 0);
 588
 589                                 if (border_style == FormBorderStyle.Fixed3D) {
 590                                         pt.X += border_3D_size.Width;
 591                                         pt.Y += border_3D_size.Height;
 592                                 } else if (border_style == FormBorderStyle.FixedSingle) {
 593                                         pt.X += 1;
 594                                         pt.Y += 1;
 595                                 }
 596
 597                                 if (this.title_style == TitleStyle.Normal)  {
 598                                         pt.Y += caption_height;
 599                                 } else if (this.title_style == TitleStyle.Tool)  {
 600                                         pt.Y += tool_caption_height;
 601                                 }
 602
 603                                 return pt;
 604                         }
 605                 }
 606
 607                 public Rectangle Invalid {
 608                         get {
 609                                 if (invalid_list.Count == 0)
 610                                         return Rectangle.Empty;
 611
 612                                 Rectangle result = (Rectangle)invalid_list[0];
 613                                 for (int i = 1; i < invalid_list.Count; i ++) {
 614                                         result = Rectangle.Union (result, (Rectangle)invalid_list[i]);
 615                                 }
 616                                 return result;
 617                         }
 618                 }
 619
 620                 public Rectangle[] ClipRectangles {
 621                         get {
 622                                 return (Rectangle[]) invalid_list.ToArray (typeof (Rectangle));
 623                         }
 624                 }
 625
 626                 public Rectangle NCInvalid {
 627                         get { return nc_invalid; }
 628                         set { nc_invalid = value; }
 629
 630                 }
 631
 632                 public bool NCExposePending {
 633                         get {
 634                                 return nc_expose_pending;
 635                         }
 636                 }
 637
 638                 public Hwnd Parent {
 639                         get {
 640                                 return parent;
 641                         }
 642
 643                         set {
 644                                 if (parent != null)
 645                                         parent.children.Remove (this);
 646                                 parent = value;
 647                                 if (parent != null)
 648                                         parent.children.Add (this);
 649                         }
 650                 }
 651
 652                 public bool Mapped {
 653                         get {
 654                                 if (!mapped) {
 655                                         return false;
 656                                 }
 657
 658                                 if (parent != null) {
 659                                         return parent.Mapped;
 660                                 }
 661
 662                                 return true;
 663                         }
 664
 665                         set {
 666                                 mapped = value;
 667                         }
 668                 }
 669
 670                 public int CaptionHeight {
 671                         get { return caption_height; }
 672                         set { caption_height = value; }
 673                 }
 674
 675                 public int ToolCaptionHeight {
 676                         get { return tool_caption_height; }
 677                         set { tool_caption_height = value; }
 678                 }
 679
 680                 public TitleStyle TitleStyle {
 681                         get {
 682                                 return title_style;
 683                         }
 684
 685                         set {
 686                                 title_style = value;
 687                         }
 688                 }
 689
 690                 public object UserData {
 691                         get {
 692                                 return user_data;
 693                         }
 694
 695                         set {
 696                                 user_data = value;
 697                         }
 698                 }
 699
 700                 public IntPtr WholeWindow {
 701                         get {
 702                                 return whole_window;
 703                         }
 704
 705                         set {
 706                                 whole_window = value;
 707
 708                                 zombie = false;
 709
 710                                 if (whole_window != IntPtr.Zero) {
 711                                         lock (windows) {
 712                                                 if (windows[whole_window] == null) {
 713                                                         windows[whole_window] = this;
 714                                                 }
 715                                         }
 716                                 }
 717                         }
 718                 }
 719
 720                 public int Width {
 721                         get {
 722                                 return width;
 723                         }
 724
 725                         set {
 726                                 width = value;
 727                         }
 728                 }
 729
 730                 public bool Visible {
 731                         get {
 732                                 return visible;
 733                         }
 734
 735                         set {
 736                                 visible = value;
 737                         }
 738                 }
 739
 740                 public int X {
 741                         get {
 742                                 return x;
 743                         }
 744
 745                         set {
 746                                 x = value;
 747                         }
 748                 }
 749
 750                 public int Y {
 751                         get {
 752                                 return y;
 753                         }
 754
 755                         set {
 756                                 y = value;
 757                         }
 758                 }
 759
 760                 #endregion      // Instance properties
 761
 762                 #region Methods
 763                 public void AddInvalidArea(int x, int y, int width, int height) {
 764                         AddInvalidArea(new Rectangle(x, y, width, height));
 765                 }
 766
 767                 public void AddInvalidArea(Rectangle rect) {
 768                         ArrayList tmp = new ArrayList ();
 769                         foreach (Rectangle r in invalid_list) {
 770                                 if (!rect.Contains (r)) {
 771                                         tmp.Add (r);
 772                                 }
 773                         }
 774                         tmp.Add (rect);
 775                         invalid_list = tmp;
 776                 }
 777
 778                 public void ClearInvalidArea() {
 779                         invalid_list.Clear();
 780                         expose_pending = false;
 781                 }
 782
 783                 public void AddNcInvalidArea(int x, int y, int width, int height) {
 784                         if (nc_invalid == Rectangle.Empty) {
 785                                 nc_invalid = new Rectangle (x, y, width, height);
 786                                 return;
 787                         }
 788
 789                         int right, bottom;
 790                         right = Math.Max (nc_invalid.Right, x + width);
 791                         bottom = Math.Max (nc_invalid.Bottom, y + height);
 792                         nc_invalid.X = Math.Min (nc_invalid.X, x);
 793                         nc_invalid.Y = Math.Min (nc_invalid.Y, y);
 794
 795                         nc_invalid.Width = right - nc_invalid.X;
 796                         nc_invalid.Height = bottom - nc_invalid.Y;
 797                 }
 798
 799                 public void AddNcInvalidArea(Rectangle rect) {
 800                         if (nc_invalid == Rectangle.Empty) {
 801                                 nc_invalid = rect;
 802                                 return;
 803                         }
 804                         nc_invalid = Rectangle.Union (nc_invalid, rect);
 805                 }
 806
 807                 public void ClearNcInvalidArea() {
 808                         nc_invalid = Rectangle.Empty;
 809                         nc_expose_pending = false;
 810                 }
 811
 812                 public override string ToString() {
 813                         return String.Format("Hwnd, Mapped:{3} ClientWindow:0x{0:X}, WholeWindow:0x{1:X}, Zombie={4}, Parent:[{2:X}]", client_window.ToInt32(), whole_window.ToInt32(), parent != null ? parent.ToString() : "<null>", Mapped, zombie);
 814                 }
 815
 816                 public static Point GetNextStackedFormLocation  (CreateParams cp, Hwnd parent_hwnd)
 817                 {
 818                         if (cp.control == null)
 819                                 return Point.Empty;
 820
 821                         int X = cp.X;
 822                         int Y = cp.Y;
 823                         Point previous, next;
 824                         Rectangle within;
 825
 826                         if (parent_hwnd != null) {
 827                                 Control parent = cp.control.Parent;
 828                                 previous = parent_hwnd.previous_child_startup_location;
 829                                 if (parent_hwnd.client_rectangle == Rectangle.Empty && parent != null) {
 830                                         within = parent.ClientRectangle;
 831                                 } else {
 832                                         within = parent_hwnd.client_rectangle;
 833                                 }
 834                         } else {
 835                                 previous = Hwnd.previous_main_startup_location;
 836                                 within = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea;
 837                         }
 838
 839                         if (previous.X == int.MinValue || previous.Y == int.MinValue) {
 840                                 next = Point.Empty;
 841                         } else {
 842                                 next = new Point (previous.X + 22, previous.Y + 22);
 843                         }
 844
 845                         if (!within.Contains (next.X * 3, next.Y * 3)) {
 846                                 next = Point.Empty;
 847                         }
 848
 849                         if (next == Point.Empty && cp.Parent == IntPtr.Zero) {
 850                                 next = new Point (22, 22);
 851                         }
 852
 853                         if (parent_hwnd != null) {
 854                                 parent_hwnd.previous_child_startup_location = next;
 855                         } else {
 856                                 Hwnd.previous_main_startup_location = next;
 857                         }
 858
 859                         if (X == int.MinValue && Y == int.MinValue) {
 860                                 X = next.X;
 861                                 Y = next.Y;
 862                         }
 863
 864                         return new Point (X, Y);
 865                 }
 866
 867                 #endregion      // Methods
 868
 869                 internal struct Borders
 870                 {
 871                         public int top;
 872                         public int bottom;
 873                         public int left;
 874                         public int right;
 875
 876                         public void Inflate (Size size)
 877                         {
 878                                 left += size.Width;
 879                                 right += size.Width;
 880                                 top += size.Height;
 881                                 bottom += size.Height;
 882                         }
 883
 884                         public override string ToString ()
 885                         {
 886                                 return string.Format("{{top={0}, bottom={1}, left={2}, right={3}}}", top, bottom, left, right);
 887                         }
 888
 889                         public static bool operator == (Borders a, Borders b)
 890                         {
 891                                 return (a.left == b.left && a.right == b.right && a.top == b.top && a.bottom == b.bottom);
 892                         }
 893
 894                         public static bool operator != (Borders a, Borders b)
 895                         {
 896                                 return !(a == b);
 897                         }
 898
 899                         public override bool Equals (object obj)
 900                         {
 901                                 return base.Equals (obj);
 902                         }
 903
 904                         public override int GetHashCode ()
 905                         {
 906                                 return base.GetHashCode ();
 907                         }
 908                 }
 909         }
 910 }