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 (920bcf17a9e1)

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
/* -*- 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):
 *
 * 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 ***** */
#include "nsCOMPtr.h"
#include "nsGkAtoms.h"

#include "nsFrameTraversal.h"
#include "nsFrameList.h"
#include "nsPlaceholderFrame.h"


class nsFrameIterator : public nsIFrameEnumerator
{
public:
  NS_DECL_ISUPPORTS

  virtual void First();
  virtual void Next();
  virtual nsIFrame* CurrentItem();
  virtual PRBool IsDone();

  virtual void Last();
  virtual void Prev();

  nsFrameIterator(nsPresContext* aPresContext, nsIFrame *aStart,
                  nsIteratorType aType, PRBool aLockScroll, PRBool aFollowOOFs);

protected:
  void      setCurrent(nsIFrame *aFrame){mCurrent = aFrame;}
  nsIFrame *getCurrent(){return mCurrent;}
  void      setStart(nsIFrame *aFrame){mStart = aFrame;}
  nsIFrame *getStart(){return mStart;}
  nsIFrame *getLast(){return mLast;}
  void      setLast(nsIFrame *aFrame){mLast = aFrame;}
  PRInt8    getOffEdge(){return mOffEdge;}
  void      setOffEdge(PRInt8 aOffEdge){mOffEdge = aOffEdge;}
  void      SetLockInScrollView(PRBool aLockScroll){mLockScroll = aLockScroll;}

  /*
   Our own versions of the standard frame tree navigation
   methods, which, if the iterator is following out-of-flows,
   apply the following rules for placeholder frames:
   
   - If a frame HAS a placeholder frame, getting its parent
   gets the placeholder's parent.
   
   - If a frame's first child or next/prev sibling IS a
   placeholder frame, then we instead return the real frame.
   
   - If a frame HAS a placeholder frame, getting its next/prev
   sibling gets the placeholder frame's next/prev sibling.
   
   These are all applied recursively to support multiple levels of
   placeholders.
   */  
  
  nsIFrame* GetParentFrame(nsIFrame* aFrame);
  // like GetParentFrame but returns null once a popup frame is reached
  nsIFrame* GetParentFrameNotPopup(nsIFrame* aFrame);

  nsIFrame* GetFirstChild(nsIFrame* aFrame);
  nsIFrame* GetLastChild(nsIFrame* aFrame);

  nsIFrame* GetNextSibling(nsIFrame* aFrame);
  nsIFrame* GetPrevSibling(nsIFrame* aFrame);

  /*
   These methods are overridden by the bidi visual iterator to have the
   semantics of "get first child in visual order", "get last child in visual
   order", "get next sibling in visual order" and "get previous sibling in visual
   order".
  */
  
  virtual nsIFrame* GetFirstChildInner(nsIFrame* aFrame);
  virtual nsIFrame* GetLastChildInner(nsIFrame* aFrame);  

  virtual nsIFrame* GetNextSiblingInner(nsIFrame* aFrame);
  virtual nsIFrame* GetPrevSiblingInner(nsIFrame* aFrame);

  nsIFrame* GetPlaceholderFrame(nsIFrame* aFrame);
  PRBool    IsPopupFrame(nsIFrame* aFrame);

  nsPresContext* mPresContext;
  PRPackedBool mLockScroll;
  PRPackedBool mFollowOOFs;
  nsIteratorType mType;

private:
  nsIFrame *mStart;
  nsIFrame *mCurrent;
  nsIFrame *mLast; //the last one that was in current;
  PRInt8    mOffEdge; //0= no -1 to far prev, 1 to far next;
};



// Bidi visual iterator
class nsVisualIterator: public nsFrameIterator
{
public:
  nsVisualIterator(nsPresContext* aPresContext, nsIFrame *aStart,
                   nsIteratorType aType, PRBool aLockScroll, PRBool aFollowOOFs) :
  nsFrameIterator(aPresContext, aStart, aType, aLockScroll, aFollowOOFs) {}

protected:
  nsIFrame* GetFirstChildInner(nsIFrame* aFrame);
  nsIFrame* GetLastChildInner(nsIFrame* aFrame);  
  
  nsIFrame* GetNextSiblingInner(nsIFrame* aFrame);
  nsIFrame* GetPrevSiblingInner(nsIFrame* aFrame);  
};

/************IMPLEMENTATIONS**************/

nsresult NS_CreateFrameTraversal(nsIFrameTraversal** aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);
  *aResult = nsnull;

  nsCOMPtr<nsIFrameTraversal> t(new nsFrameTraversal());
  if (!t)
    return NS_ERROR_OUT_OF_MEMORY;

  *aResult = t;
  NS_ADDREF(*aResult);

  return NS_OK;
}

nsresult
NS_NewFrameTraversal(nsIFrameEnumerator **aEnumerator,
                     nsPresContext* aPresContext,
                     nsIFrame *aStart,
                     nsIteratorType aType,
                     PRBool aVisual,
                     PRBool aLockInScrollView,
                     PRBool aFollowOOFs)
{
  if (!aEnumerator || !aStart)
    return NS_ERROR_NULL_POINTER;
  nsCOMPtr<nsIFrameEnumerator> trav;
  if (aVisual) {
    trav = new nsVisualIterator(aPresContext, aStart, aType,
                                aLockInScrollView, aFollowOOFs);
  } else {
    trav = new nsFrameIterator(aPresContext, aStart, aType,
                               aLockInScrollView, aFollowOOFs);
  }
  if (!trav)
    return NS_ERROR_OUT_OF_MEMORY;
  *aEnumerator = trav;
  NS_ADDREF(trav);
  return NS_OK;
}


nsFrameTraversal::nsFrameTraversal()
{
}

nsFrameTraversal::~nsFrameTraversal()
{
}

NS_IMPL_ISUPPORTS1(nsFrameTraversal,nsIFrameTraversal)

NS_IMETHODIMP 
 nsFrameTraversal::NewFrameTraversal(nsIFrameEnumerator **aEnumerator,
                                     nsPresContext* aPresContext,
                                     nsIFrame *aStart,
                                     PRInt32 aType,
                                     PRBool aVisual,
                                     PRBool aLockInScrollView,
                                     PRBool aFollowOOFs)
{
  return NS_NewFrameTraversal(aEnumerator, aPresContext, aStart,
                              static_cast<nsIteratorType>(aType),
                              aVisual, aLockInScrollView, aFollowOOFs);  
}

// nsFrameIterator implementation

NS_IMPL_ISUPPORTS1(nsFrameIterator, nsIFrameEnumerator)

nsFrameIterator::nsFrameIterator(nsPresContext* aPresContext, nsIFrame *aStart,
                                 nsIteratorType aType, PRBool aLockInScrollView,
                                 PRBool aFollowOOFs)
{
  mOffEdge = 0;
  mPresContext = aPresContext;
  if (aFollowOOFs && aStart)
    aStart = nsPlaceholderFrame::GetRealFrameFor(aStart);
  setStart(aStart);
  setCurrent(aStart);
  setLast(aStart);
  mType = aType;
  SetLockInScrollView(aLockInScrollView);
  mFollowOOFs = aFollowOOFs;
}



nsIFrame*
nsFrameIterator::CurrentItem()
{
  if (mOffEdge)
    return nsnull;

  return mCurrent;
}



PRBool
nsFrameIterator::IsDone()
{
  return mOffEdge != 0;
}

void
nsFrameIterator::First()
{
  mCurrent = mStart;
}

static PRBool
IsRootFrame(nsIFrame* aFrame)
{
  nsIAtom* atom = aFrame->GetType();
  return (atom == nsGkAtoms::canvasFrame) ||
         (atom == nsGkAtoms::rootFrame);
}

void
nsFrameIterator::Last()
{
  nsIFrame* result;
  nsIFrame* parent = getCurrent();
  // If the current frame is a popup, don't move farther up the tree.
  // Otherwise, get the nearest root frame or popup.
  if (parent->GetType() != nsGkAtoms::menuPopupFrame) {
    while (!IsRootFrame(parent) && (result = GetParentFrameNotPopup(parent)))
      parent = result;
  }

  while ((result = GetLastChild(parent))) {
    parent = result;
  }
  
  setCurrent(parent);
  if (!parent)
    setOffEdge(1);
}

void
nsFrameIterator::Next()
{
  // recursive-oid method to get next frame
  nsIFrame *result = nsnull;
  nsIFrame *parent = getCurrent();
  if (!parent)
    parent = getLast();

  if (mType == eLeaf) {
    // Drill down to first leaf
    while ((result = GetFirstChild(parent))) {
      parent = result;
    }
  } else if (mType == ePreOrder) {
    result = GetFirstChild(parent);
    if (result)
      parent = result;
  }

  if (parent != getCurrent()) {
    result = parent;
  } else {
    while (parent) {
      result = GetNextSibling(parent);
      if (result) {
        if (mType != ePreOrder) {
          parent = result;
          while ((result = GetFirstChild(parent))) {
            parent = result;
          }
          result = parent;
        }
        break;
      }
      else {
        result = GetParentFrameNotPopup(parent);
        if (!result || IsRootFrame(result) ||
            (mLockScroll && result->GetType() == nsGkAtoms::scrollFrame)) {
          result = nsnull;
          break;
        }
        if (mType == ePostOrder)
          break;
        parent = result;
      }
    }
  }

  setCurrent(result);
  if (!result) {
    setOffEdge(1);
    setLast(parent);
  }
}

void
nsFrameIterator::Prev()
{
  // recursive-oid method to get prev frame
  nsIFrame *result = nsnull;
  nsIFrame *parent = getCurrent();
  if (!parent)
    parent = getLast();

  if (mType == eLeaf) {
    // Drill down to last leaf
    while ((result = GetLastChild(parent))) {
      parent = result;
    }
  } else if (mType == ePostOrder) {
    result = GetLastChild(parent);
    if (result)
      parent = result;
  }
  
  if (parent != getCurrent()) {
    result = parent;
  } else {
    while (parent) {
      result = GetPrevSibling(parent);
      if (result) {
        if (mType != ePostOrder) {
          parent = result;
          while ((result = GetLastChild(parent))) {
            parent = result;
          }
          result = parent;
        }
        break;
      } else {
        result = GetParentFrameNotPopup(parent);
        if (!result || IsRootFrame(result) ||
            (mLockScroll && result->GetType() == nsGkAtoms::scrollFrame)) {
          result = nsnull;
          break;
        }
        if (mType == ePreOrder)
          break;
        parent = result;
      }
    }
  }

  setCurrent(result);
  if (!result) {
    setOffEdge(-1);
    setLast(parent);
  }
}

nsIFrame*
nsFrameIterator::GetParentFrame(nsIFrame* aFrame)
{
  if (mFollowOOFs)
    aFrame = GetPlaceholderFrame(aFrame);
  if (aFrame)
    return aFrame->GetParent();
  
  return nsnull;
}

nsIFrame*
nsFrameIterator::GetParentFrameNotPopup(nsIFrame* aFrame)
{
  if (mFollowOOFs)
    aFrame = GetPlaceholderFrame(aFrame);
  if (aFrame) {
    nsIFrame* parent = aFrame->GetParent();
    if (!IsPopupFrame(parent))
      return parent;
  }
    
  return nsnull;
}

nsIFrame*
nsFrameIterator::GetFirstChild(nsIFrame* aFrame)
{
  nsIFrame* result = GetFirstChildInner(aFrame);
  if (mLockScroll && result && result->GetType() == nsGkAtoms::scrollFrame)
    return nsnull;
  if (result && mFollowOOFs) {
    result = nsPlaceholderFrame::GetRealFrameFor(result);
    
    if (IsPopupFrame(result))
      result = GetNextSibling(result);
  }
  return result;
}

nsIFrame*
nsFrameIterator::GetLastChild(nsIFrame* aFrame)
{
  nsIFrame* result = GetLastChildInner(aFrame);
  if (mLockScroll && result && result->GetType() == nsGkAtoms::scrollFrame)
    return nsnull;
  if (result && mFollowOOFs) {
    result = nsPlaceholderFrame::GetRealFrameFor(result);
    
    if (IsPopupFrame(result))
      result = GetPrevSibling(result);
  }
  return result;
}

nsIFrame*
nsFrameIterator::GetNextSibling(nsIFrame* aFrame)
{
  nsIFrame* result = nsnull;
  if (mFollowOOFs)
    aFrame = GetPlaceholderFrame(aFrame);
  if (aFrame) {
    result = GetNextSiblingInner(aFrame);
    if (result && mFollowOOFs)
      result = nsPlaceholderFrame::GetRealFrameFor(result);
  }

  if (mFollowOOFs && IsPopupFrame(result))
    result = GetNextSibling(result);

  return result;
}

nsIFrame*
nsFrameIterator::GetPrevSibling(nsIFrame* aFrame)
{
  nsIFrame* result = nsnull;
  if (mFollowOOFs)
    aFrame = GetPlaceholderFrame(aFrame);
  if (aFrame) {
    result = GetPrevSiblingInner(aFrame);
    if (result && mFollowOOFs)
      result = nsPlaceholderFrame::GetRealFrameFor(result);
  }

  if (mFollowOOFs && IsPopupFrame(result))
    result = GetPrevSibling(result);

  return result;
}

nsIFrame*
nsFrameIterator::GetFirstChildInner(nsIFrame* aFrame) {
  return aFrame->GetFirstChild(nsnull);
}

nsIFrame*
nsFrameIterator::GetLastChildInner(nsIFrame* aFrame) {
  nsIFrame* child = aFrame->GetFirstChild(nsnull);
  if (!child)
    return nsnull;
  nsFrameList list(child);
  return list.LastChild();
}

nsIFrame*
nsFrameIterator::GetNextSiblingInner(nsIFrame* aFrame) {
  return aFrame->GetNextSibling();
}

nsIFrame*
nsFrameIterator::GetPrevSiblingInner(nsIFrame* aFrame) {
  nsIFrame* parent = GetParentFrame(aFrame);
  if (!parent)
    return nsnull;
  nsFrameList list(parent->GetFirstChild(nsnull));
  return list.GetPrevSiblingFor(aFrame);
}


nsIFrame*
nsFrameIterator::GetPlaceholderFrame(nsIFrame* aFrame)
{
  nsIFrame* result = aFrame;
  nsIPresShell *presShell = mPresContext->GetPresShell();
  if (presShell) {
    nsIFrame* placeholder = 0;
    presShell->GetPlaceholderFrameFor(aFrame, &placeholder);
    if (placeholder)
      result = placeholder;
  }

  if (result != aFrame)
    result = GetPlaceholderFrame(result);

  return result;
}

PRBool
nsFrameIterator::IsPopupFrame(nsIFrame* aFrame)
{
  return (aFrame &&
          aFrame->GetStyleDisplay()->mDisplay == NS_STYLE_DISPLAY_POPUP);
}

// nsVisualIterator implementation

nsIFrame*
nsVisualIterator::GetFirstChildInner(nsIFrame* aFrame) {
  nsIFrame* child = aFrame->GetFirstChild(nsnull);
  if (!child)
    return nsnull;
  nsFrameList list(child);
  return list.GetNextVisualFor(nsnull);
}

nsIFrame*
nsVisualIterator::GetLastChildInner(nsIFrame* aFrame) {
  nsIFrame* child = aFrame->GetFirstChild(nsnull);
  if (!child)
    return nsnull;
  nsFrameList list(child);
  return list.GetPrevVisualFor(nsnull);
}

nsIFrame*
nsVisualIterator::GetNextSiblingInner(nsIFrame* aFrame) {
  nsIFrame* parent = GetParentFrame(aFrame);
  if (!parent)
    return nsnull;
  nsFrameList list(parent->GetFirstChild(nsnull));
  return list.GetNextVisualFor(aFrame);
}

nsIFrame*
nsVisualIterator::GetPrevSiblingInner(nsIFrame* aFrame) {
  nsIFrame* parent = GetParentFrame(aFrame);
  if (!parent)
    return nsnull;
  nsFrameList list(parent->GetFirstChild(nsnull));
  return list.GetPrevVisualFor(aFrame);
}