DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (b66b287a2650)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Pierre Phaneuf <pp@ludusdesign.com>
 *   Elika J. Etemad ("fantasai") <fantasai@inkedblade.net>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/* base class #1 for rendering objects that have child lists */

#include "nsContainerFrame.h"
#include "nsHTMLContainerFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsStyleContext.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "nsGUIEvent.h"
#include "nsStyleConsts.h"
#include "nsIView.h"
#include "nsHTMLContainerFrame.h"
#include "nsFrameManager.h"
#include "nsIPresShell.h"
#include "nsCOMPtr.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsIViewManager.h"
#include "nsIWidget.h"
#include "nsGfxCIID.h"
#include "nsIServiceManager.h"
#include "nsCSSRendering.h"
#include "nsTransform2D.h"
#include "nsRegion.h"
#include "nsLayoutErrors.h"
#include "nsDisplayList.h"
#include "nsContentErrors.h"
#include "nsIEventStateManager.h"
#include "nsListControlFrame.h"
#include "nsIBaseWindow.h"
#include "nsThemeConstants.h"
#include "nsCSSFrameConstructor.h"
#include "nsThemeConstants.h"

#ifdef NS_DEBUG
#undef NOISY
#else
#undef NOISY
#endif

NS_IMPL_FRAMEARENA_HELPERS(nsContainerFrame)

nsContainerFrame::~nsContainerFrame()
{
}

NS_IMETHODIMP
nsContainerFrame::Init(nsIContent* aContent,
                       nsIFrame*   aParent,
                       nsIFrame*   aPrevInFlow)
{
  nsresult rv = nsSplittableFrame::Init(aContent, aParent, aPrevInFlow);
  if (aPrevInFlow) {
    // Make sure we copy bits from our prev-in-flow that will affect
    // us. A continuation for a container frame needs to know if it
    // has a child with a view so that we'll properly reposition it.
    if (aPrevInFlow->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)
      AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
  }
  return rv;
}

NS_IMETHODIMP
nsContainerFrame::SetInitialChildList(nsIAtom*     aListName,
                                      nsFrameList& aChildList)
{
  nsresult  result;
  if (!mFrames.IsEmpty()) {
    // We already have child frames which means we've already been
    // initialized
    NS_NOTREACHED("unexpected second call to SetInitialChildList");
    result = NS_ERROR_UNEXPECTED;
  } else if (aListName) {
    // All we know about is the unnamed principal child list
    NS_NOTREACHED("unknown frame list");
    result = NS_ERROR_INVALID_ARG;
  } else {
#ifdef NS_DEBUG
    nsFrame::VerifyDirtyBitSet(aChildList);
#endif
    mFrames.SetFrames(aChildList);
    result = NS_OK;
  }
  return result;
}

NS_IMETHODIMP
nsContainerFrame::AppendFrames(nsIAtom*  aListName,
                               nsFrameList& aFrameList)
{
  if (nsnull != aListName) {
#ifdef IBMBIDI
    if (aListName != nsGkAtoms::nextBidi)
#endif
    {
      NS_ERROR("unexpected child list");
      return NS_ERROR_INVALID_ARG;
    }
  }
  if (aFrameList.NotEmpty()) {
    mFrames.AppendFrames(this, aFrameList);

    // Ask the parent frame to reflow me.
#ifdef IBMBIDI
    if (nsnull == aListName)
#endif
    {
      PresContext()->PresShell()->
        FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                         NS_FRAME_HAS_DIRTY_CHILDREN);
    }
  }
  return NS_OK;
}

NS_IMETHODIMP
nsContainerFrame::InsertFrames(nsIAtom*  aListName,
                               nsIFrame* aPrevFrame,
                               nsFrameList& aFrameList)
{
  NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
               "inserting after sibling frame with different parent");

  if (nsnull != aListName) {
#ifdef IBMBIDI
    if (aListName != nsGkAtoms::nextBidi)
#endif
    {
      NS_ERROR("unexpected child list");
      return NS_ERROR_INVALID_ARG;
    }
  }
  if (aFrameList.NotEmpty()) {
    // Insert frames after aPrevFrame
    mFrames.InsertFrames(this, aPrevFrame, aFrameList);

#ifdef IBMBIDI
    if (nsnull == aListName)
#endif
    {
      PresContext()->PresShell()->
        FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                         NS_FRAME_HAS_DIRTY_CHILDREN);
    }
  }
  return NS_OK;
}

NS_IMETHODIMP
nsContainerFrame::RemoveFrame(nsIAtom*  aListName,
                              nsIFrame* aOldFrame)
{
  if (nsnull != aListName) {
#ifdef IBMBIDI
    if (nsGkAtoms::nextBidi != aListName)
#endif
    {
      NS_ERROR("unexpected child list");
      return NS_ERROR_INVALID_ARG;
    }
  }

  if (aOldFrame) {
    // Loop and destroy the frame and all of its continuations.
    // If the frame we are removing is a brFrame, we need a reflow so
    // the line the brFrame was on can attempt to pull up any frames
    // that can fit from lines below it.
    PRBool generateReflowCommand = PR_TRUE;
#ifdef IBMBIDI
    if (nsGkAtoms::nextBidi == aListName) {
      generateReflowCommand = PR_FALSE;
    }
#endif
    nsContainerFrame* parent = static_cast<nsContainerFrame*>(aOldFrame->GetParent());
    while (aOldFrame) {
      // When the parent is an inline frame we have a simple task - just
      // remove the frame from its parents list and generate a reflow
      // command.
      nsIFrame* oldFrameNextContinuation = aOldFrame->GetNextContinuation();
      //XXXfr probably should use StealFrame here. I'm not sure if we need to
      //      check the overflow lists atm, but we'll need a prescontext lookup
      //      for overflow containers once we can split abspos elements with
      //      inline containing blocks.
      if (parent == this) {
        if (!parent->mFrames.DestroyFrame(aOldFrame)) {
          // Try to remove it from our overflow list, if we have one.
          // The simplest way is to reuse StealFrame.
#ifdef DEBUG
          nsresult rv =
#endif
            StealFrame(PresContext(), aOldFrame, PR_TRUE);
          NS_ASSERTION(NS_SUCCEEDED(rv), "Could not find frame to remove!");
          aOldFrame->Destroy();
        }
      } else {
        // This recursive call takes care of all continuations after aOldFrame,
        // so we don't need to loop anymore.
        parent->RemoveFrame(nsnull, aOldFrame);
        break;
      }
      aOldFrame = oldFrameNextContinuation;
      if (aOldFrame) {
        parent = static_cast<nsContainerFrame*>(aOldFrame->GetParent());
      }
    }

    if (generateReflowCommand) {
      PresContext()->PresShell()->
        FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                         NS_FRAME_HAS_DIRTY_CHILDREN);
    }
  }

  return NS_OK;
}

void
nsContainerFrame::Destroy()
{
  // Prevent event dispatch during destruction
  if (HasView()) {
    GetView()->SetClientData(nsnull);
  }

  // Delete the primary child list
  mFrames.DestroyFrames();

  // Destroy auxiliary frame lists
  nsPresContext* prescontext = PresContext();

  DestroyOverflowList(prescontext);

  if (IsFrameOfType(nsIFrame::eCanContainOverflowContainers)) {
    nsFrameList* frameList = RemovePropTableFrames(prescontext,
                               nsGkAtoms::overflowContainersProperty);
    if (frameList)
      frameList->Destroy();

    frameList = RemovePropTableFrames(prescontext,
                  nsGkAtoms::excessOverflowContainersProperty);
    if (frameList)
      frameList->Destroy();
  }

  if (IsGeneratedContentFrame()) {
    // Make sure all the content nodes for the generated content inside
    // this frame know it's going away.
    // See also nsCSSFrameConstructor::CreateGeneratedContentFrame which
    // created this frame.
    nsCOMArray<nsIContent>* generatedContent =
      static_cast<nsCOMArray<nsIContent>*>(
        UnsetProperty(nsGkAtoms::generatedContent));

    if (generatedContent) {
      for (int i = generatedContent->Count() - 1; i >= 0; --i) {
        nsIContent* content = generatedContent->ObjectAt(i);
        // Tell the ESM that this content is going away now, so it'll update
        // its hover content, etc.
        PresContext()->EventStateManager()->
          ContentRemoved(content->GetCurrentDoc(), content);
        content->UnbindFromTree();
      }
      delete generatedContent;
    }
  }

  // Destroy the frame and remove the flow pointers
  nsSplittableFrame::Destroy();
}

/////////////////////////////////////////////////////////////////////////////
// Child frame enumeration

nsFrameList
nsContainerFrame::GetChildList(nsIAtom* aListName) const
{
  // We only know about the unnamed principal child list and the overflow
  // lists
  if (nsnull == aListName) {
    return mFrames;
  }

  if (nsGkAtoms::overflowList == aListName) {
    nsFrameList* frameList = GetOverflowFrames();
    return frameList ? *frameList : nsFrameList::EmptyList();
  }

  if (nsGkAtoms::overflowContainersList == aListName) {
    nsFrameList* list = GetPropTableFrames(PresContext(),
                          nsGkAtoms::overflowContainersProperty);
    return list ? *list : nsFrameList::EmptyList();
  }

  if (nsGkAtoms::excessOverflowContainersList == aListName) {
    nsFrameList* list = GetPropTableFrames(PresContext(),
                          nsGkAtoms::excessOverflowContainersProperty);
    return list ? *list : nsFrameList::EmptyList();

  }

  return nsFrameList::EmptyList();
}

#define NS_CONTAINER_FRAME_OVERFLOW_LIST_INDEX                   0
#define NS_CONTAINER_FRAME_OVERFLOW_CONTAINERS_LIST_INDEX        1
#define NS_CONTAINER_FRAME_EXCESS_OVERFLOW_CONTAINERS_LIST_INDEX 2
// If adding/removing lists, don't forget to update count in .h file


nsIAtom*
nsContainerFrame::GetAdditionalChildListName(PRInt32 aIndex) const
{
  if (NS_CONTAINER_FRAME_OVERFLOW_LIST_INDEX == aIndex)
    return nsGkAtoms::overflowList;
  else if (IsFrameOfType(nsIFrame::eCanContainOverflowContainers)) {
    if (NS_CONTAINER_FRAME_OVERFLOW_CONTAINERS_LIST_INDEX == aIndex)
      return nsGkAtoms::overflowContainersList;
    else if (NS_CONTAINER_FRAME_EXCESS_OVERFLOW_CONTAINERS_LIST_INDEX == aIndex)
      return nsGkAtoms::excessOverflowContainersList;
  }
  return nsnull;
}

/////////////////////////////////////////////////////////////////////////////
// Painting/Events

NS_IMETHODIMP
nsContainerFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                   const nsRect&           aDirtyRect,
                                   const nsDisplayListSet& aLists)
{
  nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
  NS_ENSURE_SUCCESS(rv, rv);

  return BuildDisplayListForNonBlockChildren(aBuilder, aDirtyRect, aLists);
}

nsresult
nsContainerFrame::BuildDisplayListForNonBlockChildren(nsDisplayListBuilder*   aBuilder,
                                                      const nsRect&           aDirtyRect,
                                                      const nsDisplayListSet& aLists,
                                                      PRUint32                aFlags)
{
  nsIFrame* kid = mFrames.FirstChild();
  // Put each child's background directly onto the content list
  nsDisplayListSet set(aLists, aLists.Content());
  // The children should be in content order
  while (kid) {
    nsresult rv = BuildDisplayListForChild(aBuilder, kid, aDirtyRect, set, aFlags);
    NS_ENSURE_SUCCESS(rv, rv);
    kid = kid->GetNextSibling();
  }
  return NS_OK;
}

/* virtual */ void
nsContainerFrame::ChildIsDirty(nsIFrame* aChild)
{
  AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
}

PRBool
nsContainerFrame::IsLeaf() const
{
  return PR_FALSE;
}

PRBool
nsContainerFrame::PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset)
{
  NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
  // Don't allow the caret to stay in an empty (leaf) container frame.
  return PR_FALSE;
}

PRBool
nsContainerFrame::PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset)
{
  NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
  // Don't allow the caret to stay in an empty (leaf) container frame.
  return PR_FALSE;
}

/////////////////////////////////////////////////////////////////////////////
// Helper member functions

/**
 * Position the view associated with |aKidFrame|, if there is one. A
 * container frame should call this method after positioning a frame,
 * but before |Reflow|.
 */
void
nsContainerFrame::PositionFrameView(nsIFrame* aKidFrame)
{
  nsIFrame* parentFrame = aKidFrame->GetParent();
  if (!aKidFrame->HasView() || !parentFrame)
    return;

  nsIView* view = aKidFrame->GetView();
  nsIViewManager* vm = view->GetViewManager();
  nsPoint pt;
  nsIView* ancestorView = parentFrame->GetClosestView(&pt);

  if (ancestorView != view->GetParent()) {
    NS_ASSERTION(ancestorView == view->GetParent()->GetParent(),
                 "Allowed only one anonymous view between frames");
    // parentFrame is responsible for positioning aKidFrame's view
    // explicitly
    return;
  }

  pt += aKidFrame->GetPosition();
  vm->MoveViewTo(view, pt.x, pt.y);
}

static PRBool
IsMenuPopup(nsIFrame *aFrame)
{
  nsIAtom *frameType = aFrame->GetType();

  // We're a menupopup if we're the list control frame dropdown for a combobox.
  if (frameType == nsGkAtoms::listControlFrame) {
    nsListControlFrame *listControlFrame = static_cast<nsListControlFrame*>(aFrame);
      
    if (listControlFrame) {
      return listControlFrame->IsInDropDownMode();
    }
  }

  // ... or if we're a XUL menupopup frame.
  return (frameType == nsGkAtoms::menuPopupFrame);
}

static nsIWidget*
GetPresContextContainerWidget(nsPresContext* aPresContext)
{
  nsCOMPtr<nsISupports> container = aPresContext->Document()->GetContainer();
  nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
  if (!baseWindow)
    return nsnull;

  nsCOMPtr<nsIWidget> mainWidget;
  baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
  return mainWidget;
}

static PRBool
IsTopLevelWidget(nsIWidget* aWidget)
{
  nsWindowType windowType;
  aWidget->GetWindowType(windowType);
  return windowType == eWindowType_toplevel ||
         windowType == eWindowType_dialog || 
         windowType == eWindowType_sheet;
  // popups aren't toplevel so they're not handled here
}

void
nsContainerFrame::SyncWindowProperties(nsPresContext*       aPresContext,
                                       nsIFrame*            aFrame,
                                       nsIView*             aView)
{
#ifdef MOZ_XUL
  if (!aView || !nsCSSRendering::IsCanvasFrame(aFrame) || !aView->HasWidget())
    return;

  nsIWidget* windowWidget = GetPresContextContainerWidget(aPresContext);
  if (!windowWidget || !IsTopLevelWidget(windowWidget))
    return;

  nsIViewManager* vm = aView->GetViewManager();
  nsIView* rootView;
  vm->GetRootView(rootView);

  if (aView != rootView)
    return;

  nsIContent* rootContent = aPresContext->Document()->GetRootContent();
  if (!rootContent || !rootContent->IsNodeOfType(nsINode::eXUL)) {
    // Scrollframes use native widgets which don't work well with
    // translucent windows, at least in Windows XP. So if the document
    // has a root scrollrame it's useless to try to make it transparent,
    // we'll just get something broken.
    // nsCSSFrameConstructor::ConstructRootFrame constructs root
    // scrollframes whenever the root element is not a XUL element, so
    // we test for that here. We can't just call
    // presShell->GetRootScrollFrame() since that might not have
    // been constructed yet.
    // We can change this to allow translucent toplevel HTML documents
    // (e.g. to do something like Dashboard widgets), once we
    // have broad support for translucent scrolled documents, but be
    // careful because apparently some Firefox extensions expect
    // openDialog("something.html") to produce an opaque window
    // even if the HTML doesn't have a background-color set.
    return;
  }

  nsIFrame *rootFrame = aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
  if (!rootFrame)
    return;

  nsTransparencyMode mode = nsLayoutUtils::GetFrameTransparency(aFrame);
  // The issue here is that the CSS 'background' propagates from the root
  // element's frame (rootFrame) to the real root frame (nsViewportFrame),
  // so we need to call GetFrameTransparency on that. But -moz-appearance
  // does not propagate so we need to check that directly on rootFrame.
  if (NS_THEME_WIN_GLASS == rootFrame->GetStyleDisplay()->mAppearance) {
    mode = eTransparencyGlass;
  }
  nsIWidget* viewWidget = aView->GetWidget();
  viewWidget->SetTransparencyMode(mode);
  windowWidget->SetWindowShadowStyle(rootFrame->GetStyleUIReset()->mWindowShadow);
#endif
}

void
nsContainerFrame::SyncFrameViewAfterReflow(nsPresContext* aPresContext,
                                           nsIFrame*       aFrame,
                                           nsIView*        aView,
                                           const nsRect*   aCombinedArea,
                                           PRUint32        aFlags)
{
  if (!aView) {
    return;
  }

  NS_ASSERTION(aCombinedArea, "Combined area must be passed in now");

  // Make sure the view is sized and positioned correctly
  if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
    PositionFrameView(aFrame);
  }

  if (0 == (aFlags & NS_FRAME_NO_SIZE_VIEW)) {
    nsIViewManager* vm = aView->GetViewManager();

    vm->ResizeView(aView, *aCombinedArea, PR_TRUE);
  }
}

void
nsContainerFrame::SyncFrameViewProperties(nsPresContext*  aPresContext,
                                          nsIFrame*        aFrame,
                                          nsStyleContext*  aStyleContext,
                                          nsIView*         aView,
                                          PRUint32         aFlags)
{
  NS_ASSERTION(!aStyleContext || aFrame->GetStyleContext() == aStyleContext,
               "Wrong style context for frame?");

  if (!aView) {
    return;
  }

  nsIViewManager* vm = aView->GetViewManager();
 
  /* If this frame has a -moz-transform property, tell it to invalidate on a scroll
   * rather than doing a BitBlt.
   */
  if (aFrame->GetStyleDisplay()->HasTransform())
    aView->SetInvalidateFrameOnScroll();

  if (nsnull == aStyleContext) {
    aStyleContext = aFrame->GetStyleContext();
  }

  // Make sure visibility is correct. This only affects nsSubdocumentFrame.
  if (0 == (aFlags & NS_FRAME_NO_VISIBILITY) &&
      !aFrame->SupportsVisibilityHidden()) {
    // See if the view should be hidden or visible
    vm->SetViewVisibility(aView,
        aStyleContext->GetStyleVisibility()->IsVisible()
            ? nsViewVisibility_kShow : nsViewVisibility_kHide);
  }

  // See if the frame is being relatively positioned or absolutely
  // positioned
  PRBool isPositioned = aStyleContext->GetStyleDisplay()->IsPositioned();

  PRInt32 zIndex = 0;
  PRBool  autoZIndex = PR_FALSE;

  if (!isPositioned) {
    autoZIndex = PR_TRUE;
  } else {
    // Make sure z-index is correct
    const nsStylePosition* position = aStyleContext->GetStylePosition();

    if (position->mZIndex.GetUnit() == eStyleUnit_Integer) {
      zIndex = position->mZIndex.GetIntValue();
    } else if (position->mZIndex.GetUnit() == eStyleUnit_Auto) {
      autoZIndex = PR_TRUE;
    }
  }

  vm->SetViewZIndex(aView, autoZIndex, zIndex, isPositioned);
}

PRBool
nsContainerFrame::FrameNeedsView(nsIFrame* aFrame)
{
  // XXX Check needed because frame construction can't properly figure out when
  // a frame is the child of a scrollframe
  if (aFrame->GetStyleContext()->GetPseudoType() ==
      nsCSSAnonBoxes::scrolledContent) {
    return PR_TRUE;
  }
  return aFrame->NeedsView() || aFrame->GetStyleDisplay()->HasTransform();
}

static nscoord GetCoord(const nsStyleCoord& aCoord, nscoord aIfNotCoord)
{
  return aCoord.GetUnit() == eStyleUnit_Coord
           ? aCoord.GetCoordValue()
           : aIfNotCoord;
}

void
nsContainerFrame::DoInlineIntrinsicWidth(nsIRenderingContext *aRenderingContext,
                                         InlineIntrinsicWidthData *aData,
                                         nsLayoutUtils::IntrinsicWidthType aType)
{
  if (GetPrevInFlow())
    return; // Already added.

  NS_PRECONDITION(aType == nsLayoutUtils::MIN_WIDTH ||
                  aType == nsLayoutUtils::PREF_WIDTH, "bad type");

  PRUint8 startSide, endSide;
  if (GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR) {
    startSide = NS_SIDE_LEFT;
    endSide = NS_SIDE_RIGHT;
  } else {
    startSide = NS_SIDE_RIGHT;
    endSide = NS_SIDE_LEFT;
  }

  const nsStylePadding *stylePadding = GetStylePadding();
  const nsStyleBorder *styleBorder = GetStyleBorder();
  const nsStyleMargin *styleMargin = GetStyleMargin();

  // This goes at the beginning no matter how things are broken and how
  // messy the bidi situations are, since per CSS2.1 section 8.6
  // (implemented in bug 328168), the startSide border is always on the
  // first line.
  // This frame is a first-in-flow, but it might have a previous bidi
  // continuation, in which case that continuation should handle the startSide 
  // border.
  if (!GetPrevContinuation()) {
    aData->currentLine +=
      GetCoord(stylePadding->mPadding.Get(startSide), 0) +
      styleBorder->GetActualBorderWidth(startSide) +
      GetCoord(styleMargin->mMargin.Get(startSide), 0);
  }

  const nsLineList_iterator* savedLine = aData->line;
  nsIFrame* const savedLineContainer = aData->lineContainer;

  nsContainerFrame *lastInFlow;
  for (nsContainerFrame *nif = this; nif;
       nif = static_cast<nsContainerFrame*>(nif->GetNextInFlow())) {
    for (nsIFrame *kid = nif->mFrames.FirstChild(); kid;
         kid = kid->GetNextSibling()) {
      if (aType == nsLayoutUtils::MIN_WIDTH)
        kid->AddInlineMinWidth(aRenderingContext,
                               static_cast<InlineMinWidthData*>(aData));
      else
        kid->AddInlinePrefWidth(aRenderingContext,
                                static_cast<InlinePrefWidthData*>(aData));
    }
    
    // After we advance to our next-in-flow, the stored line and line container
    // may no longer be correct. Just forget them.
    aData->line = nsnull;
    aData->lineContainer = nsnull;

    lastInFlow = nif;
  }
  
  aData->line = savedLine;
  aData->lineContainer = savedLineContainer;

  // This goes at the end no matter how things are broken and how
  // messy the bidi situations are, since per CSS2.1 section 8.6
  // (implemented in bug 328168), the endSide border is always on the
  // last line.
  // We reached the last-in-flow, but it might have a next bidi
  // continuation, in which case that continuation should handle 
  // the endSide border.
  if (!lastInFlow->GetNextContinuation()) {
    aData->currentLine +=
      GetCoord(stylePadding->mPadding.Get(endSide), 0) +
      styleBorder->GetActualBorderWidth(endSide) +
      GetCoord(styleMargin->mMargin.Get(endSide), 0);
  }
}

/* virtual */ nsSize
nsContainerFrame::ComputeAutoSize(nsIRenderingContext *aRenderingContext,
                                  nsSize aCBSize, nscoord aAvailableWidth,
                                  nsSize aMargin, nsSize aBorder,
                                  nsSize aPadding, PRBool aShrinkWrap)
{
  nsSize result(0xdeadbeef, NS_UNCONSTRAINEDSIZE);
  nscoord availBased = aAvailableWidth - aMargin.width - aBorder.width -
                       aPadding.width;
  // replaced elements always shrink-wrap
  if (aShrinkWrap || IsFrameOfType(eReplaced)) {
    // don't bother setting it if the result won't be used
    if (GetStylePosition()->mWidth.GetUnit() == eStyleUnit_Auto) {
      result.width = ShrinkWidthToFit(aRenderingContext, availBased);
    }
  } else {
    result.width = availBased;
  }
  return result;
}

/**
 * Invokes the WillReflow() function, positions the frame and its view (if
 * requested), and then calls Reflow(). If the reflow succeeds and the child
 * frame is complete, deletes any next-in-flows using DeleteNextInFlowChild()
 */
nsresult
nsContainerFrame::ReflowChild(nsIFrame*                aKidFrame,
                              nsPresContext*           aPresContext,
                              nsHTMLReflowMetrics&     aDesiredSize,
                              const nsHTMLReflowState& aReflowState,
                              nscoord                  aX,
                              nscoord                  aY,
                              PRUint32                 aFlags,
                              nsReflowStatus&          aStatus,
                              nsOverflowContinuationTracker* aTracker)
{
  NS_PRECONDITION(aReflowState.frame == aKidFrame, "bad reflow state");

  nsresult  result;

  // Send the WillReflow() notification, and position the child frame
  // and its view if requested
  aKidFrame->WillReflow(aPresContext);

  if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
    if ((aFlags & NS_FRAME_INVALIDATE_ON_MOVE) &&
        !(aKidFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) &&
        aKidFrame->GetPosition() != nsPoint(aX, aY)) {
      aKidFrame->InvalidateOverflowRect();
    }
    aKidFrame->SetPosition(nsPoint(aX, aY));
  }

  if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
    PositionFrameView(aKidFrame);
  }

  // Reflow the child frame
  result = aKidFrame->Reflow(aPresContext, aDesiredSize, aReflowState,
                             aStatus);

  // If the reflow was successful and the child frame is complete, delete any
  // next-in-flows
  if (NS_SUCCEEDED(result) && NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
    nsIFrame* kidNextInFlow = aKidFrame->GetNextInFlow();
    if (nsnull != kidNextInFlow) {
      // Remove all of the childs next-in-flows. Make sure that we ask
      // the right parent to do the removal (it's possible that the
      // parent is not this because we are executing pullup code)
      if (aTracker) aTracker->Finish(aKidFrame);
      static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
        ->DeleteNextInFlowChild(aPresContext, kidNextInFlow, PR_TRUE);
    }
  }
  return result;
}


/**
 * Position the views of |aFrame|'s descendants. A container frame
 * should call this method if it moves a frame after |Reflow|.
 */
void
nsContainerFrame::PositionChildViews(nsIFrame* aFrame)
{
  if (!(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) {
    return;
  }

  nsIAtom*  childListName = nsnull;
  PRInt32   childListIndex = 0;

  do {
    // Recursively walk aFrame's child frames
    nsIFrame* childFrame = aFrame->GetFirstChild(childListName);
    while (childFrame) {
      // Position the frame's view (if it has one) otherwise recursively
      // process its children
      if (childFrame->HasView()) {
        PositionFrameView(childFrame);
      } else {
        PositionChildViews(childFrame);
      }

      // Get the next sibling child frame
      childFrame = childFrame->GetNextSibling();
    }

    // also process the additional child lists, but skip the popup list as the
    // view for popups is managed by the parent. Currently only nsMenuFrame
    // has a popupList and during layout will call nsMenuPopupFrame::AdjustView.
    do {
      childListName = aFrame->GetAdditionalChildListName(childListIndex++);
    } while (childListName == nsGkAtoms::popupList);
  } while (childListName);
}

/**
 * The second half of frame reflow. Does the following:
 * - sets the frame's bounds
 * - sizes and positions (if requested) the frame's view. If the frame's final
 *   position differs from the current position and the frame itself does not
 *   have a view, then any child frames with views are positioned so they stay
 *   in sync
 * - sets the view's visibility, opacity, content transparency, and clip
 * - invoked the DidReflow() function
 *
 * Flags:
 * NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
 *    case. Also implies NS_FRAME_NO_MOVE_VIEW
 * NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
 *    don't want to automatically sync the frame and view
 * NS_FRAME_NO_SIZE_VIEW - don't size the frame's view
 */
nsresult
nsContainerFrame::FinishReflowChild(nsIFrame*                  aKidFrame,
                                    nsPresContext*             aPresContext,
                                    const nsHTMLReflowState*   aReflowState,
                                    const nsHTMLReflowMetrics& aDesiredSize,
                                    nscoord                    aX,
                                    nscoord                    aY,
                                    PRUint32                   aFlags)
{
  nsPoint curOrigin = aKidFrame->GetPosition();
  nsRect  bounds(aX, aY, aDesiredSize.width, aDesiredSize.height);

  aKidFrame->SetRect(bounds);

  if (aKidFrame->HasView()) {
    nsIView* view = aKidFrame->GetView();
    // Make sure the frame's view is properly sized and positioned and has
    // things like opacity correct
    SyncFrameViewAfterReflow(aPresContext, aKidFrame, view,
                             &aDesiredSize.mOverflowArea,
                             aFlags);
  }

  if (!(aFlags & NS_FRAME_NO_MOVE_VIEW) &&
      (curOrigin.x != aX || curOrigin.y != aY)) {
    if (!aKidFrame->HasView()) {
      // If the frame has moved, then we need to make sure any child views are
      // correctly positioned
      PositionChildViews(aKidFrame);
    }

    // We also need to redraw everything associated with the frame
    // because if the frame's Reflow issued any invalidates, then they
    // will be at the wrong offset ... note that this includes
    // invalidates issued against the frame's children, so we need to
    // invalidate the overflow area too.
    aKidFrame->Invalidate(aDesiredSize.mOverflowArea);
  }
  
  return aKidFrame->DidReflow(aPresContext, aReflowState, NS_FRAME_REFLOW_FINISHED);
}

nsresult
nsContainerFrame::ReflowOverflowContainerChildren(nsPresContext*           aPresContext,
                                                  const nsHTMLReflowState& aReflowState,
                                                  nsRect&                  aOverflowRect,
                                                  PRUint32                 aFlags,
                                                  nsReflowStatus&          aStatus)
{
  NS_PRECONDITION(aPresContext, "null pointer");
  nsresult rv = NS_OK;

  nsFrameList* overflowContainers =
               GetPropTableFrames(aPresContext,
                                  nsGkAtoms::overflowContainersProperty);

  NS_ASSERTION(!(overflowContainers && GetPrevInFlow()
                 && static_cast<nsContainerFrame*>(GetPrevInFlow())
                      ->GetPropTableFrames(aPresContext,
                          nsGkAtoms::excessOverflowContainersProperty)),
               "conflicting overflow containers lists");

  if (!overflowContainers) {
    // Drain excess from previnflow
    nsContainerFrame* prev = (nsContainerFrame*) GetPrevInFlow();
    if (prev) {
      nsFrameList* excessFrames =
        prev->RemovePropTableFrames(aPresContext,
                nsGkAtoms::excessOverflowContainersProperty);
      if (excessFrames) {
        nsFrameList reparenter;
        reparenter.InsertFrames(this, nsnull, excessFrames->FirstChild());
        nsHTMLContainerFrame::ReparentFrameViewList(aPresContext,
                                                    excessFrames->FirstChild(),
                                                    prev, this);
        overflowContainers = excessFrames;
        rv = SetPropTableFrames(aPresContext, overflowContainers,
                                nsGkAtoms::overflowContainersProperty);
        if (NS_FAILED(rv)) {
          excessFrames->DestroyFrames();
          delete excessFrames;
          return rv;
        }
      }
    }
  }

  if (!overflowContainers)
    return NS_OK; // nothing to reflow

  nsOverflowContinuationTracker tracker(aPresContext, this, PR_FALSE, PR_FALSE);
  PRBool shouldReflowAllKids = aReflowState.ShouldReflowAllKids();

  for (nsIFrame* frame = overflowContainers->FirstChild(); frame;
       frame = frame->GetNextSibling()) {
    if (frame->GetPrevInFlow()->GetParent() != GetPrevInFlow()) {
      // frame's prevInFlow has moved, skip reflowing this frame;
      // it will get reflowed once it's been placed
      continue;
    }
    // If the available vertical height has changed, we need to reflow
    // even if the frame isn't dirty.
    if (shouldReflowAllKids || NS_SUBTREE_DIRTY(frame)) {
      // Get prev-in-flow
      nsIFrame* prevInFlow = frame->GetPrevInFlow();
      NS_ASSERTION(prevInFlow,
                   "overflow container frame must have a prev-in-flow");
      NS_ASSERTION(frame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER,
                   "overflow container frame must have overflow container bit set");
      nsRect prevRect = prevInFlow->GetRect();

      // Initialize reflow params
      nsSize availSpace(prevRect.width, aReflowState.availableHeight);
      nsHTMLReflowMetrics desiredSize;
      nsHTMLReflowState frameState(aPresContext, aReflowState,
                                   frame, availSpace);
      nsReflowStatus frameStatus = NS_FRAME_COMPLETE;

      // Cache old bounds
      nsRect oldRect = frame->GetRect();
      nsRect oldOverflow = frame->GetOverflowRect();

      // Reflow
      rv = ReflowChild(frame, aPresContext, desiredSize, frameState,
                       prevRect.x, 0, aFlags, frameStatus, &tracker);
      NS_ENSURE_SUCCESS(rv, rv);
      //XXXfr Do we need to override any shrinkwrap effects here?
      // e.g. desiredSize.width = prevRect.width;
      rv = FinishReflowChild(frame, aPresContext, &frameState, desiredSize,
                             prevRect.x, 0, aFlags);
      NS_ENSURE_SUCCESS(rv, rv);

      // Invalidate if there was a position or size change
      nsRect rect = frame->GetRect();
      if (rect != oldRect) {
        nsRect dirtyRect = oldOverflow;
        dirtyRect.MoveBy(oldRect.x, oldRect.y);
        Invalidate(dirtyRect);

        dirtyRect = frame->GetOverflowRect();
        dirtyRect.MoveBy(rect.x, rect.y);
        Invalidate(dirtyRect);
      }

      // Handle continuations
      if (!NS_FRAME_IS_FULLY_COMPLETE(frameStatus)) {
        if (frame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
          // Abspos frames can't cause their parent to be incomplete,
          // only overflow incomplete.
          NS_FRAME_SET_OVERFLOW_INCOMPLETE(frameStatus);
        }
        else {
          NS_ASSERTION(NS_FRAME_IS_COMPLETE(frameStatus),
                       "overflow container frames can't be incomplete, only overflow-incomplete");
        }

        // Acquire a next-in-flow, creating it if necessary
        nsIFrame* nif = frame->GetNextInFlow();
        if (!nif) {
          rv = nsHTMLContainerFrame::CreateNextInFlow(aPresContext, this,
                                                      frame, nif);
          NS_ENSURE_SUCCESS(rv, rv);
          NS_ASSERTION(frameStatus & NS_FRAME_REFLOW_NEXTINFLOW,
                       "Someone forgot a REFLOW_NEXTINFLOW flag");
          frame->SetNextSibling(nif->GetNextSibling());
          nif->SetNextSibling(nsnull);
        }
        else if (!(nif->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
          // used to be a normal next-in-flow; steal it from the child list
          rv = static_cast<nsContainerFrame*>(nif->GetParent())
                 ->StealFrame(aPresContext, nif);
          NS_ENSURE_SUCCESS(rv, rv);
        }

        tracker.Insert(nif, frameStatus);
      }
      NS_MergeReflowStatusInto(&aStatus, frameStatus);
      // At this point it would be nice to assert !frame->GetOverflowRect().IsEmpty(),
      // but we have some unsplittable frames that, when taller than
      // availableHeight will push zero-height content into a next-in-flow.
    }
    else {
      tracker.Skip(frame, aStatus);
    }
    ConsiderChildOverflow(aOverflowRect, frame);
  }

  return NS_OK;
}

void
nsContainerFrame::DisplayOverflowContainers(nsDisplayListBuilder*   aBuilder,
                                            const nsRect&           aDirtyRect,
                                            const nsDisplayListSet& aLists)
{
  nsFrameList* overflowconts = GetPropTableFrames(PresContext(),
                                 nsGkAtoms::overflowContainersProperty);
  if (overflowconts) {
    for (nsIFrame* frame = overflowconts->FirstChild(); frame;
         frame = frame->GetNextSibling()) {
      BuildDisplayListForChild(aBuilder, frame, aDirtyRect, aLists);
    }
  }
}

nsresult
nsContainerFrame::StealFrame(nsPresContext* aPresContext,
                             nsIFrame*      aChild,
                             PRBool         aForceNormal)
{
  PRBool removed = PR_TRUE;
  if ((aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)
      && !aForceNormal) {
    // Try removing from the overflow container list
    if (!RemovePropTableFrame(aPresContext, aChild,
                              nsGkAtoms::overflowContainersProperty)) {
      // It must be in the excess overflow container list
      removed = RemovePropTableFrame(aPresContext, aChild,
                  nsGkAtoms::excessOverflowContainersProperty);
    }
  }
  else {
    if (!mFrames.RemoveFrame(aChild)) {
      // We didn't find the child in the parent's principal child list.
      // Maybe it's on the overflow list?
      nsFrameList* frameList = GetOverflowFrames();
      if (frameList) {
        removed = frameList->RemoveFrame(aChild);
        if (frameList->IsEmpty()) {
          DestroyOverflowList(aPresContext);
        }
      }
    }
  }
  return (removed) ? NS_OK : NS_ERROR_UNEXPECTED;
}

void
nsContainerFrame::DestroyOverflowList(nsPresContext* aPresContext)
{
  nsFrameList* list =
    RemovePropTableFrames(aPresContext, nsGkAtoms::overflowProperty);
  if (list)
    list->Destroy();
}

/**
 * Remove and delete aNextInFlow and its next-in-flows. Updates the sibling and flow
 * pointers
 */
void
nsContainerFrame::DeleteNextInFlowChild(nsPresContext* aPresContext,
                                        nsIFrame*      aNextInFlow,
                                        PRBool         aDeletingEmptyFrames)
{
#ifdef DEBUG
  nsIFrame* prevInFlow = aNextInFlow->GetPrevInFlow();
#endif
  NS_PRECONDITION(prevInFlow, "bad prev-in-flow");

  // If the next-in-flow has a next-in-flow then delete it, too (and
  // delete it first).
  // Do this in a loop so we don't overflow the stack for frames
  // with very many next-in-flows
  nsIFrame* nextNextInFlow = aNextInFlow->GetNextInFlow();
  if (nextNextInFlow) {
    nsAutoTArray<nsIFrame*, 8> frames;
    for (nsIFrame* f = nextNextInFlow; f; f = f->GetNextInFlow()) {
      frames.AppendElement(f);
    }
    for (PRInt32 i = frames.Length() - 1; i >= 0; --i) {
      nsIFrame* delFrame = frames.ElementAt(i);
      static_cast<nsContainerFrame*>(delFrame->GetParent())
        ->DeleteNextInFlowChild(aPresContext, delFrame, aDeletingEmptyFrames);
    }
  }

  aNextInFlow->Invalidate(aNextInFlow->GetOverflowRect());

  // Take the next-in-flow out of the parent's child list
#ifdef DEBUG
  nsresult rv = 
#endif
    StealFrame(aPresContext, aNextInFlow);
  NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame failure");

  // Delete the next-in-flow frame and its descendants. This will also
  // remove it from its next-in-flow/prev-in-flow chain.
  aNextInFlow->Destroy();

  NS_POSTCONDITION(!prevInFlow->GetNextInFlow(), "non null next-in-flow");
}

// Destructor function for the proptable-stored framelists
static void
DestroyFrameList(void*           aFrame,
                 nsIAtom*        aPropertyName,
                 void*           aPropertyValue,
                 void*           aDtorData)
{
  if (aPropertyValue)
    static_cast<nsFrameList*>(aPropertyValue)->Destroy();
}

/**
 * Set the frames on the overflow list
 */
nsresult
nsContainerFrame::SetOverflowFrames(nsPresContext* aPresContext,
                                    const nsFrameList& aOverflowFrames)
{
  NS_PRECONDITION(aOverflowFrames.NotEmpty(), "Shouldn't be called");
  nsFrameList* newList = new nsFrameList(aOverflowFrames);
  if (!newList) {
    // XXXbz should really destroy the frames here, but callers are holding
    // pointers to them.... We should switch all callers to framelists, then
    // audit and do that.
    return NS_ERROR_OUT_OF_MEMORY;
  }

  nsresult rv =
    aPresContext->PropertyTable()->SetProperty(this,
                                               nsGkAtoms::overflowProperty,
                                               newList,
                                               DestroyFrameList,
                                               nsnull);
  if (NS_FAILED(rv)) {
    newList->Destroy();
  }

  // Verify that we didn't overwrite an existing overflow list
  NS_ASSERTION(rv != NS_PROPTABLE_PROP_OVERWRITTEN, "existing overflow list");

  return rv;
}

nsFrameList*
nsContainerFrame::GetPropTableFrames(nsPresContext*  aPresContext,
                                     nsIAtom*        aPropID) const
{
  nsPropertyTable* propTable = aPresContext->PropertyTable();
  return static_cast<nsFrameList*>(propTable->GetProperty(this, aPropID));
}

nsFrameList*
nsContainerFrame::RemovePropTableFrames(nsPresContext*  aPresContext,
                                        nsIAtom*        aPropID) const
{
  nsPropertyTable* propTable = aPresContext->PropertyTable();
  return static_cast<nsFrameList*>(propTable->UnsetProperty(this, aPropID));
}

PRBool
nsContainerFrame::RemovePropTableFrame(nsPresContext*  aPresContext,
                                       nsIFrame*       aFrame,
                                       nsIAtom*        aPropID) const
{
  nsFrameList* frameList = RemovePropTableFrames(aPresContext, aPropID);
  if (!frameList) {
    // No such list
    return PR_FALSE;
  }
  if (!frameList->RemoveFrame(aFrame)) {
    // Found list, but it doesn't have the frame. Put list back.
    SetPropTableFrames(aPresContext, frameList, aPropID);
    return PR_FALSE;
  }

  if (frameList->IsEmpty()) {
    // Removed frame and now list is empty. Delete it.
    delete frameList;
  }
  else {
    // Removed frame, but list not empty. Put it back.
    SetPropTableFrames(aPresContext, frameList, aPropID);
  }
  return PR_TRUE;
}

nsresult
nsContainerFrame::SetPropTableFrames(nsPresContext*  aPresContext,
                                     nsFrameList*    aFrameList,
                                     nsIAtom*        aPropID) const
{
  NS_PRECONDITION(aPresContext && aPropID && aFrameList, "null ptr");
  NS_PRECONDITION((aPropID != nsGkAtoms::overflowContainersProperty &&
                   aPropID != nsGkAtoms::excessOverflowContainersProperty) ||
                  IsFrameOfType(nsIFrame::eCanContainOverflowContainers),
                  "this type of frame can't have overflow containers");
  nsresult rv = aPresContext->PropertyTable()->SetProperty(this, aPropID,
                  aFrameList, DestroyFrameList, nsnull);
  NS_ASSERTION(rv != NS_PROPTABLE_PROP_OVERWRITTEN, "existing framelist");
  return rv;
}

/**
 * Push aFromChild and its next siblings to the next-in-flow. Change the
 * geometric parent of each frame that's pushed. If there is no next-in-flow
 * the frames are placed on the overflow list (and the geometric parent is
 * left unchanged).
 *
 * Updates the next-in-flow's child count. Does <b>not</b> update the
 * pusher's child count.
 *
 * @param   aFromChild the first child frame to push. It is disconnected from
 *            aPrevSibling
 * @param   aPrevSibling aFromChild's previous sibling. Must not be null. It's
 *            an error to push a parent's first child frame
 */
void
nsContainerFrame::PushChildren(nsPresContext* aPresContext,
                               nsIFrame*       aFromChild,
                               nsIFrame*       aPrevSibling)
{
  NS_PRECONDITION(nsnull != aFromChild, "null pointer");
  NS_PRECONDITION(nsnull != aPrevSibling, "pushing first child");
  NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");

  // Disconnect aFromChild from its previous sibling
  aPrevSibling->SetNextSibling(nsnull);

  if (nsnull != GetNextInFlow()) {
    // XXX This is not a very good thing to do. If it gets removed
    // then remove the copy of this routine that doesn't do this from
    // nsInlineFrame.
    nsContainerFrame* nextInFlow = (nsContainerFrame*)GetNextInFlow();
    // When pushing and pulling frames we need to check for whether any
    // views need to be reparented.
    for (nsIFrame* f = aFromChild; f; f = f->GetNextSibling()) {
      nsHTMLContainerFrame::ReparentFrameView(aPresContext, f, this, nextInFlow);
    }
    nextInFlow->mFrames.InsertFrames(nextInFlow, nsnull, aFromChild);
  }
  else {
    // Add the frames to our overflow list
    SetOverflowFrames(aPresContext, aFromChild);
  }
}

/**
 * Moves any frames on the overflow lists (the prev-in-flow's overflow list and
 * the receiver's overflow list) to the child list.
 *
 * Updates this frame's child count and content mapping.
 *
 * @return  PR_TRUE if any frames were moved and PR_FALSE otherwise
 */
PRBool
nsContainerFrame::MoveOverflowToChildList(nsPresContext* aPresContext)
{
  PRBool result = PR_FALSE;

  // Check for an overflow list with our prev-in-flow
  nsContainerFrame* prevInFlow = (nsContainerFrame*)GetPrevInFlow();
  if (nsnull != prevInFlow) {
    nsAutoPtr<nsFrameList> prevOverflowFrames(prevInFlow->StealOverflowFrames());
    if (prevOverflowFrames) {
      // Tables are special; they can have repeated header/footer
      // frames on mFrames at this point.
      NS_ASSERTION(mFrames.IsEmpty() || GetType() == nsGkAtoms::tableFrame,
                   "bad overflow list");
      // When pushing and pulling frames we need to check for whether any
      // views need to be reparented.
      nsHTMLContainerFrame::ReparentFrameViewList(aPresContext,
                                                  *prevOverflowFrames,
                                                  prevInFlow, this);
      mFrames.AppendFrames(this, *prevOverflowFrames);
      result = PR_TRUE;
    }
  }

  // It's also possible that we have an overflow list for ourselves
  nsAutoPtr<nsFrameList> overflowFrames(StealOverflowFrames());
  if (overflowFrames) {
    NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
    mFrames.AppendFrames(nsnull, *overflowFrames);
    result = PR_TRUE;
  }
  return result;
}

nsOverflowContinuationTracker::nsOverflowContinuationTracker(nsPresContext*    aPresContext,
                                                             nsContainerFrame* aFrame,
                                                             PRBool            aWalkOOFFrames,
                                                             PRBool            aSkipOverflowContainerChildren)
  : mOverflowContList(nsnull),
    mPrevOverflowCont(nsnull),
    mSentry(nsnull),
    mParent(aFrame),
    mSkipOverflowContainerChildren(aSkipOverflowContainerChildren),
    mWalkOOFFrames(aWalkOOFFrames)
{
  NS_PRECONDITION(aFrame, "null frame pointer");
  nsContainerFrame* next = static_cast<nsContainerFrame*>
                             (aFrame->GetNextInFlow());
  if (next) {
    mOverflowContList =
      next->GetPropTableFrames(aPresContext,
                               nsGkAtoms::overflowContainersProperty);
    if (mOverflowContList) {
      mParent = next;
      SetUpListWalker();
    }
  }
  if (!mOverflowContList) {
    mOverflowContList =
      mParent->GetPropTableFrames(aPresContext,
                                  nsGkAtoms::excessOverflowContainersProperty);
    if (mOverflowContList) {
      SetUpListWalker();
    }
  }
}

/**
 * Helper function to walk past overflow continuations whose prev-in-flow
 * isn't a normal child and to set mSentry and mPrevOverflowCont correctly.
 */
void
nsOverflowContinuationTracker::SetUpListWalker()
{
  NS_ASSERTION(!mSentry && !mPrevOverflowCont,
               "forgot to reset mSentry or mPrevOverflowCont");
  if (mOverflowContList) {
    nsIFrame* cur = mOverflowContList->FirstChild();
    if (mSkipOverflowContainerChildren) {
      while (cur && (cur->GetPrevInFlow()->GetStateBits()
                     & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
        mPrevOverflowCont = cur;
        cur = cur->GetNextSibling();
      }
      while (cur && (!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
                     == mWalkOOFFrames)) {
        mPrevOverflowCont = cur;
        cur = cur->GetNextSibling();
      }
    }
    if (cur) {
      mSentry = cur->GetPrevInFlow();
    }
  }
}

/**
 * Helper function to step forward through the overflow continuations list.
 * Sets mSentry and mPrevOverflowCont, skipping over OOF or non-OOF frames
 * as appropriate. May only be called when we have already set up an
 * mOverflowContList; mOverflowContList cannot be null.
 */
void
nsOverflowContinuationTracker::StepForward()
{
  NS_PRECONDITION(mOverflowContList, "null list");

  // Step forward
  if (mPrevOverflowCont) {
    mPrevOverflowCont = mPrevOverflowCont->GetNextSibling();
  }
  else {
    mPrevOverflowCont = mOverflowContList->FirstChild();
  }

  // Skip over oof or non-oof frames as appropriate
  if (mSkipOverflowContainerChildren) {
    nsIFrame* cur = mPrevOverflowCont->GetNextSibling();
    while (cur && (!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
                   == mWalkOOFFrames)) {
      mPrevOverflowCont = cur;
      cur = cur->GetNextSibling();
    }
  }

  // Set up the sentry
  mSentry = (mPrevOverflowCont->GetNextSibling())
            ? mPrevOverflowCont->GetNextSibling()->GetPrevInFlow()
            : nsnull;
}

nsresult
nsOverflowContinuationTracker::Insert(nsIFrame*       aOverflowCont,
                                      nsReflowStatus& aReflowStatus)
{
  NS_PRECONDITION(aOverflowCont, "null frame pointer");
  NS_PRECONDITION(!mSkipOverflowContainerChildren || mWalkOOFFrames ==
                  !!(aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW),
                  "shouldn't insert frame that doesn't match walker type");
  NS_PRECONDITION(aOverflowCont->GetPrevInFlow(),
                  "overflow containers must have a prev-in-flow");
  nsresult rv = NS_OK;
  PRBool convertedToOverflowContainer = PR_FALSE;
  nsPresContext* presContext = aOverflowCont->PresContext();
  if (!mSentry || aOverflowCont != mSentry->GetNextInFlow()) {
    // Not in our list, so we need to add it
    if (aOverflowCont->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
      // aOverflowCont is in some other overflow container list,
      // steal it first
      NS_ASSERTION(!(mOverflowContList &&
                     mOverflowContList->ContainsFrame(aOverflowCont)),
                   "overflow containers out of order");
      rv = static_cast<nsContainerFrame*>(aOverflowCont->GetParent())
             ->StealFrame(presContext, aOverflowCont);
      NS_ENSURE_SUCCESS(rv, rv);
    }
    else {
      aOverflowCont->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
      convertedToOverflowContainer = PR_TRUE;
    }
    if (!mOverflowContList) {
      mOverflowContList = new nsFrameList();
      rv = mParent->SetPropTableFrames(presContext,
             mOverflowContList, nsGkAtoms::excessOverflowContainersProperty);
      NS_ENSURE_SUCCESS(rv, rv);
      SetUpListWalker();
    }
    if (aOverflowCont->GetParent() != mParent) {
      nsHTMLContainerFrame::ReparentFrameView(presContext, aOverflowCont,
                                              aOverflowCont->GetParent(),
                                              mParent);
    }
    mOverflowContList->InsertFrame(mParent, mPrevOverflowCont, aOverflowCont);
    aReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
  }

  // If we need to reflow it, mark it dirty
  if (aReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW)
    aOverflowCont->AddStateBits(NS_FRAME_IS_DIRTY);

  // It's in our list, just step forward
  StepForward();
  NS_ASSERTION(mPrevOverflowCont == aOverflowCont ||
               (mSkipOverflowContainerChildren &&
                (mPrevOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW) !=
                (aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW)),
              "OverflowContTracker in unexpected state");

  if (convertedToOverflowContainer) {
    // Convert all non-overflow-container continuations of aOverflowCont
    // into overflow containers and move them to our overflow
    // tracker. This preserves the invariant that the next-continuations
    // of an overflow container are also overflow containers.
    nsIFrame* f = aOverflowCont->GetNextContinuation();
    if (f && !(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
      nsContainerFrame* parent = static_cast<nsContainerFrame*>(f->GetParent());
      rv = parent->StealFrame(presContext, f);
      NS_ENSURE_SUCCESS(rv, rv);
      Insert(f, aReflowStatus);
    }
  }
  return rv;
}

void
nsOverflowContinuationTracker::Finish(nsIFrame* aChild)
{
  NS_PRECONDITION(aChild, "null ptr");
  NS_PRECONDITION(aChild->GetNextInFlow(),
                "supposed to call Finish *before* deleting next-in-flow!");

  for (nsIFrame* f = aChild; f; f = f->GetNextInFlow()) {
    if (f == mSentry) {
      // Make sure we drop all references if this was the only frame
      // in the overflow containers list
      if (mOverflowContList->FirstChild() == f->GetNextInFlow()
          && !f->GetNextInFlow()->GetNextSibling()) {
        mOverflowContList = nsnull;
        mPrevOverflowCont = nsnull;
        mSentry = nsnull;
        mParent = static_cast<nsContainerFrame*>(f->GetParent());
        break;
      }
      else {
        // Step past aChild
        nsIFrame* prevOverflowCont = mPrevOverflowCont;
        StepForward();
        if (mPrevOverflowCont == f->GetNextInFlow()) {
          // Pull mPrevOverflowChild back to aChild's prevSibling:
          // aChild will be removed from our list by our caller
          mPrevOverflowCont = prevOverflowCont;
        }
      }
    }
  }
}

/////////////////////////////////////////////////////////////////////////////
// Debugging

#ifdef NS_DEBUG
NS_IMETHODIMP
nsContainerFrame::List(FILE* out, PRInt32 aIndent) const
{
  IndentBy(out, aIndent);
  ListTag(out);
#ifdef DEBUG_waterson
  fprintf(out, " [parent=%p]", static_cast<void*>(mParent));
#endif
  if (HasView()) {
    fprintf(out, " [view=%p]", static_cast<void*>(GetView()));
  }
  if (nsnull != mNextSibling) {
    fprintf(out, " next=%p", static_cast<void*>(mNextSibling));
  }
  if (nsnull != GetPrevContinuation()) {
    fprintf(out, " prev-continuation=%p", static_cast<void*>(GetPrevContinuation()));
  }
  if (nsnull != GetNextContinuation()) {
    fprintf(out, " next-continuation=%p", static_cast<void*>(GetNextContinuation()));
  }
  fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
  if (0 != mState) {
    fprintf(out, " [state=%08x]", mState);
  }
  fprintf(out, " [content=%p]", static_cast<void*>(mContent));
  nsContainerFrame* f = const_cast<nsContainerFrame*>(this);
  if (f->HasOverflowRect()) {
    nsRect overflowArea = f->GetOverflowRect();
    fprintf(out, " [overflow=%d,%d,%d,%d]", overflowArea.x, overflowArea.y,
            overflowArea.width, overflowArea.height);
  }
  fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
  nsIAtom* pseudoTag = mStyleContext->GetPseudoType();
  if (pseudoTag) {
    nsAutoString atomString;
    pseudoTag->ToString(atomString);
    fprintf(out, " pst=%s",
            NS_LossyConvertUTF16toASCII(atomString).get());
  }

  // Output the children
  nsIAtom* listName = nsnull;
  PRInt32 listIndex = 0;
  PRBool outputOneList = PR_FALSE;
  do {
    nsIFrame* kid = GetFirstChild(listName);
    if (nsnull != kid) {
      if (outputOneList) {
        IndentBy(out, aIndent);
      }
      outputOneList = PR_TRUE;
      nsAutoString tmp;
      if (nsnull != listName) {
        listName->ToString(tmp);
        fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
      }
      fputs("<\n", out);
      while (nsnull != kid) {
        // Verify the child frame's parent frame pointer is correct
        NS_ASSERTION(kid->GetParent() == (nsIFrame*)this, "bad parent frame pointer");

        // Have the child frame list
        nsIFrameDebug *frameDebug = do_QueryFrame(kid);
        if (frameDebug) {
          frameDebug->List(out, aIndent + 1);
        }
        kid = kid->GetNextSibling();
      }
      IndentBy(out, aIndent);
      fputs(">\n", out);
    }
    listName = GetAdditionalChildListName(listIndex++);
  } while(nsnull != listName);

  if (!outputOneList) {
    fputs("<>\n", out);
  }

  return NS_OK;
}
#endif