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.

Mercurial (3865bf230c49)

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
/* -*- 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 MathML Project.
 *
 * The Initial Developer of the Original Code is
 * The University Of Queensland.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roger B. Sidje <rbs@maths.uq.edu.au>
 *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
 *   Shyjan Mahamud <mahamud@cs.cmu.edu> (added TeX rendering rules)
 *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
 *
 * 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 ***** */

#ifndef nsMathMLContainerFrame_h___
#define nsMathMLContainerFrame_h___

#include "nsCOMPtr.h"
#include "nsHTMLContainerFrame.h"
#include "nsBlockFrame.h"
#include "nsInlineFrame.h"
#include "nsMathMLAtoms.h"
#include "nsMathMLOperators.h"
#include "nsMathMLChar.h"
#include "nsMathMLFrame.h"
#include "nsMathMLParts.h"

/*
 * Base class for MathML container frames. It acts like an inferred 
 * mrow. By default, this frame uses its Reflow() method to lay its 
 * children horizontally and ensure that their baselines are aligned.
 * The Reflow() method relies upon Place() to position children.
 * By overloading Place() in derived classes, it is therefore possible
 * to position children in various customized ways.
 */

// Options for the preferred size at which to stretch our stretchy children 
#define STRETCH_CONSIDER_ACTUAL_SIZE    0x00000001 // just use our current size
#define STRETCH_CONSIDER_EMBELLISHMENTS 0x00000002 // size calculations include embellishments

class nsMathMLContainerFrame : public nsHTMLContainerFrame,
                               public nsMathMLFrame {
  friend class nsMathMLmfencedFrame;
public:
  nsMathMLContainerFrame(nsStyleContext* aContext) : nsHTMLContainerFrame(aContext) {}

  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS

  // --------------------------------------------------------------------------
  // Overloaded nsMathMLFrame methods -- see documentation in nsIMathMLFrame.h

  NS_IMETHOD
  Stretch(nsIRenderingContext& aRenderingContext,
          nsStretchDirection   aStretchDirection,
          nsBoundingMetrics&   aContainerSize,
          nsHTMLReflowMetrics& aDesiredStretchSize);

  NS_IMETHOD
  UpdatePresentationDataFromChildAt(PRInt32         aFirstIndex,
                                    PRInt32         aLastIndex,
                                    PRUint32        aFlagsValues,
                                    PRUint32        aFlagsToUpdate)
  {
    PropagatePresentationDataFromChildAt(this, aFirstIndex, aLastIndex,
      aFlagsValues, aFlagsToUpdate);
    return NS_OK;
  }
  
  // helper to set the "increment script level" flag on the element belonging
  // to a child frame given by aChildIndex.
  // When this flag is set, the style system will increment the scriptlevel
  // for the child element. This is needed for situations where the style system
  // cannot itself determine the scriptlevel (mfrac, munder, mover, munderover).
  // This should be called during reflow. We set the flag and if it changed,
  // we request appropriate restyling and also queue a post-reflow callback
  // to ensure that restyle and reflow happens immediately after the current
  // reflow.
  void
  SetIncrementScriptLevel(PRInt32 aChildIndex, PRBool aIncrement);

  // --------------------------------------------------------------------------
  // Overloaded nsHTMLContainerFrame methods -- see documentation in nsIFrame.h

  virtual PRBool IsFrameOfType(PRUint32 aFlags) const
  {
    return !(aFlags & nsIFrame::eLineParticipant) &&
      nsHTMLContainerFrame::IsFrameOfType(aFlags &
              ~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace));
  }

  virtual PRIntn GetSkipSides() const { return 0; }

  NS_IMETHOD
  AppendFrames(nsIAtom*        aListName,
               nsFrameList&    aFrameList);

  NS_IMETHOD
  InsertFrames(nsIAtom*        aListName,
               nsIFrame*       aPrevFrame,
               nsFrameList&    aFrameList);

  NS_IMETHOD
  RemoveFrame(nsIAtom*        aListName,
              nsIFrame*       aOldFrame);

  /**
   * Both GetMinWidth and GetPrefWidth return whatever
   * GetIntrinsicWidth returns.
   */
  virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
  virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);

  /**
   * Return the intrinsic width of the frame's content area.
   */
  virtual nscoord GetIntrinsicWidth(nsIRenderingContext *aRenderingContext);

  NS_IMETHOD
  Reflow(nsPresContext*          aPresContext,
         nsHTMLReflowMetrics&     aDesiredSize,
         const nsHTMLReflowState& aReflowState,
         nsReflowStatus&          aStatus);

  NS_IMETHOD
  WillReflow(nsPresContext* aPresContext)
  {
    mPresentationData.flags &= ~NS_MATHML_ERROR;
    return nsHTMLContainerFrame::WillReflow(aPresContext);
  }

  NS_IMETHOD
  DidReflow(nsPresContext*           aPresContext,
            const nsHTMLReflowState*  aReflowState,
            nsDidReflowStatus         aStatus)

  {
    mPresentationData.flags &= ~NS_MATHML_STRETCH_DONE;
    return nsHTMLContainerFrame::DidReflow(aPresContext, aReflowState, aStatus);
  }

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

  // Notification when an attribute is changed. The MathML module uses the
  // following paradigm:
  //
  // 1. If the MathML frame class doesn't have any cached automatic data that
  //    depends on the attribute: we just reflow (e.g., this happens with <msub>,
  //    <msup>, <mmultiscripts>, etc). This is the default behavior implemented
  //    by this base class.
  //
  // 2. If the MathML frame class has cached automatic data that depends on
  //    the attribute:
  //    2a. If the automatic data to update resides only within the descendants,
  //        we just re-layout them using ReLayoutChildren(this);
  //        (e.g., this happens with <ms>).
  //    2b. If the automatic data to update affects us in some way, we ask our parent
  //        to re-layout its children using ReLayoutChildren(mParent);
  //        Therefore, there is an overhead here in that our siblings are re-laid
  //        too (e.g., this happens with <mstyle>, <munder>, <mover>, <munderover>). 
  NS_IMETHOD
  AttributeChanged(PRInt32         aNameSpaceID,
                   nsIAtom*        aAttribute,
                   PRInt32         aModType);

  // --------------------------------------------------------------------------
  // Additional methods 

protected:
  /* Place :
   * This method is used to measure or position child frames and other
   * elements.  It may be called any number of times with aPlaceOrigin
   * false to measure, and the final call of the Reflow process before
   * returning from Reflow() or Stretch() will have aPlaceOrigin true
   * to position the elements.
   *
   * IMPORTANT: This method uses GetReflowAndBoundingMetricsFor() which must
   * have been set up with SaveReflowAndBoundingMetricsFor().
   *
   * The Place() method will use this information to compute the desired size
   * of the frame.
   *
   * @param aPlaceOrigin [in]
   *        If aPlaceOrigin is false, compute your desired size using the
   *        information from GetReflowAndBoundingMetricsFor.  However, child
   *        frames or other elements should not be repositioned.
   *
   *        If aPlaceOrigin is true, reflow is finished. You should position
   *        all your children, and return your desired size. You should now
   *        use FinishReflowChild() on your children to complete post-reflow
   *        operations.
   *
   * @param aDesiredSize [out] parameter where you should return your desired
   *        size and your ascent/descent info. Compute your desired size using
   *        the information from GetReflowAndBoundingMetricsFor, and include
   *        any space you want for border/padding in the desired size you
   *        return.
   */
  virtual nsresult
  Place(nsIRenderingContext& aRenderingContext,
        PRBool               aPlaceOrigin,
        nsHTMLReflowMetrics& aDesiredSize);

  // MeasureForWidth:
  //
  // A method used by nsMathMLContainerFrame::GetIntrinsicWidth to get the
  // width that a particular Place method desires.  For most frames, this will
  // just call the object's Place method.  However <msqrt> and <menclose> use
  // nsMathMLContainerFrame::GetIntrinsicWidth to measure the child frames as
  // if in an <mrow>, and so their frames implement MeasureForWidth to use
  // nsMathMLContainerFrame::Place.
  virtual nsresult
  MeasureForWidth(nsIRenderingContext& aRenderingContext,
                  nsHTMLReflowMetrics& aDesiredSize);


  // helper to re-sync the automatic data in our children and notify our parent to
  // reflow us when changes (e.g., append/insert/remove) happen in our child list
  virtual nsresult
  ChildListChanged(PRInt32 aModType);

  // helper to get the preferred size that a container frame should use to fire
  // the stretch on its stretchy child frames.
  void
  GetPreferredStretchSize(nsIRenderingContext& aRenderingContext,
                          PRUint32             aOptions,
                          nsStretchDirection   aStretchDirection,
                          nsBoundingMetrics&   aPreferredStretchSize);

public:
  // error handlers to provide a visual feedback to the user when an error
  // (typically invalid markup) was encountered during reflow.
  nsresult
  ReflowError(nsIRenderingContext& aRenderingContext,
              nsHTMLReflowMetrics& aDesiredSize);

  // helper method to reflow a child frame. We are inline frames, and we don't
  // know our positions until reflow is finished. That's why we ask the
  // base method not to worry about our position.
  nsresult 
  ReflowChild(nsIFrame*                aKidFrame,
              nsPresContext*          aPresContext,
              nsHTMLReflowMetrics&     aDesiredSize,
              const nsHTMLReflowState& aReflowState,
              nsReflowStatus&          aStatus);

protected:
  // helper to add the inter-spacing when <math> is the immediate parent.
  // Since we don't (yet) handle the root <math> element ourselves, we need to
  // take special care of the inter-frame spacing on elements for which <math>
  // is the direct xml parent. This function will be repeatedly called from
  // left to right on the childframes of <math>, and by so doing it will
  // emulate the spacing that would have been done by a <mrow> container.
  // e.g., it fixes <math> <mi>f</mi> <mo>q</mo> <mi>f</mi> <mo>I</mo> </math>
  virtual nscoord
  FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);

  // helper method to complete the post-reflow hook and ensure that embellished
  // operators don't terminate their Reflow without receiving a Stretch command.
  virtual nsresult
  FinalizeReflow(nsIRenderingContext& aRenderingContext,
                 nsHTMLReflowMetrics& aDesiredSize);

  // Record metrics of a child frame for recovery through the following method
  static void
  SaveReflowAndBoundingMetricsFor(nsIFrame*                  aFrame,
                                  const nsHTMLReflowMetrics& aReflowMetrics,
                                  const nsBoundingMetrics&   aBoundingMetrics);

  // helper method to facilitate getting the reflow and bounding metrics of a
  // child frame.  The argument aMathMLFrameType, when non null, will return
  // the 'type' of the frame, which is used to determine the inter-frame
  // spacing.
  // IMPORTANT: This function is only meant to be called in Place() methods as
  // the information is available only when set up with the above method
  // during Reflow/Stretch() and GetPrefWidth().
  static void
  GetReflowAndBoundingMetricsFor(nsIFrame*            aFrame,
                                 nsHTMLReflowMetrics& aReflowMetrics,
                                 nsBoundingMetrics&   aBoundingMetrics,
                                 eMathMLFrameType*    aMathMLFrameType = nsnull);

  // helper method to clear metrics saved with
  // SaveReflowAndBoundingMetricsFor() from all child frames.
  void ClearSavedChildMetrics();

  // helper to let the update of presentation data pass through
  // a subtree that may contain non-MathML container frames
  static void
  PropagatePresentationDataFor(nsIFrame*       aFrame,
                               PRUint32        aFlagsValues,
                               PRUint32        aFlagsToUpdate);

public:
  static void
  PropagatePresentationDataFromChildAt(nsIFrame*       aParentFrame,
                                       PRInt32         aFirstChildIndex,
                                       PRInt32         aLastChildIndex,
                                       PRUint32        aFlagsValues,
                                       PRUint32        aFlagsToUpdate);

  // helper to let the rebuild of automatic data (presentation data
  // and embellishement data) walk through a subtree that may contain
  // non-MathML container frames. Note that this method re-builds the
  // automatic data in the children -- not in aParentFrame itself (except
  // for those particular operations that the parent frame may do in its
  // TransmitAutomaticData()). The reason it works this way is because
  // a container frame knows what it wants for its children, whereas children
  // have no clue who their parent is. For example, it is <mfrac> who knows
  // that its children have to be in scriptsizes, and has to transmit this
  // information to them. Hence, when changes occur in a child frame, the child
  // has to request the re-build from its parent. Unfortunately, the extra cost
  // for this is that it will re-sync in the siblings of the child as well.
  static void
  RebuildAutomaticDataForChildren(nsIFrame* aParentFrame);

  // helper to blow away the automatic data cached in a frame's subtree and
  // re-layout its subtree to reflect changes that may have happen. In the
  // event where aParentFrame isn't a MathML frame, it will first walk up to
  // the ancestor that is a MathML frame, and re-layout from there -- this is
  // to guarantee that automatic data will be rebuilt properly. Note that this
  // method re-builds the automatic data in the children -- not in the parent
  // frame itself (except for those particular operations that the parent frame
  // may do do its TransmitAutomaticData()). @see RebuildAutomaticDataForChildren
  //
  // aBits are the bits to pass to FrameNeedsReflow() when we call it.
  static nsresult
  ReLayoutChildren(nsIFrame* aParentFrame);

protected:
  // Helper method which positions child frames as an <mrow> on given baseline
  // y = aBaseline starting from x = aOffsetX, calling FinishReflowChild()
  // on the frames.
  void
  PositionRowChildFrames(nscoord aOffsetX, nscoord aBaseline);

  // A variant on FinishAndStoreOverflow() that uses the union of child
  // overflows, the frame bounds, and mBoundingMetrics to set and store the
  // overflow.
  void GatherAndStoreOverflow(nsHTMLReflowMetrics* aMetrics);

  /**
   * Call DidReflow() if the NS_FRAME_IN_REFLOW frame bit is set on aFirst and
   * all its next siblings up to, but not including, aStop.
   * aStop == nsnull meaning all next siblings with the bit set.
   * The method does nothing if aFirst == nsnull.
   */
  static void DidReflowChildren(nsIFrame* aFirst, nsIFrame* aStop = nsnull);

private:
  class RowChildFrameIterator;
  friend class RowChildFrameIterator;
};


// --------------------------------------------------------------------------
// Currently, to benefit from line-breaking inside the <math> element, <math> is
// simply mapping to nsBlockFrame or nsInlineFrame.
// A separate implemention needs to provide:
// 1) line-breaking
// 2) proper inter-frame spacing
// 3) firing of Stretch() (in which case FinalizeReflow() would have to be cleaned)
// Issues: If/when mathml becomes a pluggable component, the separation will be needed.
class nsMathMLmathBlockFrame : public nsBlockFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS

  friend nsIFrame* NS_NewMathMLmathBlockFrame(nsIPresShell* aPresShell,
          nsStyleContext* aContext, PRUint32 aFlags);

  // beware, mFrames is not set by nsBlockFrame
  // cannot use mFrames{.FirstChild()|.etc} since the block code doesn't set mFrames
  NS_IMETHOD
  SetInitialChildList(nsIAtom*        aListName,
                      nsFrameList&    aChildList)
  {
    NS_ASSERTION(!aListName, "unexpected frame list");
    nsresult rv = nsBlockFrame::SetInitialChildList(aListName, aChildList);
    // re-resolve our subtree to set any mathml-expected data
    nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
    return rv;
  }

  NS_IMETHOD
  AppendFrames(nsIAtom*        aListName,
               nsFrameList&    aFrameList)
  {
    NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
                 "unexpected frame list");
    nsresult rv = nsBlockFrame::AppendFrames(aListName, aFrameList);
    if (NS_LIKELY(!aListName))
      nsMathMLContainerFrame::ReLayoutChildren(this);
    return rv;
  }

  NS_IMETHOD
  InsertFrames(nsIAtom*        aListName,
               nsIFrame*       aPrevFrame,
               nsFrameList&    aFrameList)
  {
    NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
                 "unexpected frame list");
    nsresult rv = nsBlockFrame::InsertFrames(aListName, aPrevFrame, aFrameList);
    if (NS_LIKELY(!aListName))
      nsMathMLContainerFrame::ReLayoutChildren(this);
    return rv;
  }

  NS_IMETHOD
  RemoveFrame(nsIAtom*        aListName,
              nsIFrame*       aOldFrame)
  {
    NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
                 "unexpected frame list");
    nsresult rv = nsBlockFrame::RemoveFrame(aListName, aOldFrame);
    if (NS_LIKELY(!aListName))
      nsMathMLContainerFrame::ReLayoutChildren(this);
    return rv;
  }

  virtual PRBool IsFrameOfType(PRUint32 aFlags) const {
    return nsBlockFrame::IsFrameOfType(aFlags &
              ~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace));
  }

protected:
  nsMathMLmathBlockFrame(nsStyleContext* aContext) : nsBlockFrame(aContext) {
    // We should always have a float manager.  Not that things can really try
    // to float out of us anyway, but we need one for line layout.
    AddStateBits(NS_BLOCK_FLOAT_MGR);
  }
  virtual ~nsMathMLmathBlockFrame() {}
};

// --------------

class nsMathMLmathInlineFrame : public nsInlineFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS

  friend nsIFrame* NS_NewMathMLmathInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

  NS_IMETHOD
  SetInitialChildList(nsIAtom*        aListName,
                      nsFrameList&    aChildList)
  {
    NS_ASSERTION(!aListName, "unexpected frame list");
    nsresult rv = nsInlineFrame::SetInitialChildList(aListName, aChildList);
    // re-resolve our subtree to set any mathml-expected data
    nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
    return rv;
  }

  NS_IMETHOD
  AppendFrames(nsIAtom*        aListName,
               nsFrameList&    aFrameList)
  {
    NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
                 "unexpected frame list");
    nsresult rv = nsInlineFrame::AppendFrames(aListName, aFrameList);
    if (NS_LIKELY(!aListName))
      nsMathMLContainerFrame::ReLayoutChildren(this);
    return rv;
  }

  NS_IMETHOD
  InsertFrames(nsIAtom*        aListName,
               nsIFrame*       aPrevFrame,
               nsFrameList&    aFrameList)
  {
    NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
                 "unexpected frame list");
    nsresult rv = nsInlineFrame::InsertFrames(aListName, aPrevFrame, aFrameList);
    if (NS_LIKELY(!aListName))
      nsMathMLContainerFrame::ReLayoutChildren(this);
    return rv;
  }

  NS_IMETHOD
  RemoveFrame(nsIAtom*        aListName,
              nsIFrame*       aOldFrame)
  {
    NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
                 "unexpected frame list");
    nsresult rv = nsInlineFrame::RemoveFrame(aListName, aOldFrame);
    if (NS_LIKELY(!aListName))
      nsMathMLContainerFrame::ReLayoutChildren(this);
    return rv;
  }

  virtual PRBool IsFrameOfType(PRUint32 aFlags) const {
      return nsInlineFrame::IsFrameOfType(aFlags &
                ~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace));
  }

protected:
  nsMathMLmathInlineFrame(nsStyleContext* aContext) : nsInlineFrame(aContext) {}
  virtual ~nsMathMLmathInlineFrame() {}
};

#endif /* nsMathMLContainerFrame_h___ */