gecko-dev/layout/generic/nsLineBox.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (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/NPL/
 *
 * 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 Communicator client code.
 *
 * The Initial Developer of the Original Code is Netscape Communications
 * Corporation.  Portions created by Netscape are Copyright (C) 1998
 * Netscape Communications Corporation.  All Rights Reserved.
 */
#include "nsLineBox.h"
#include "nsISpaceManager.h"
#include "nsIStyleContext.h"
#include "nsLineLayout.h"
#include "prprf.h"

nsLineBox::nsLineBox(nsIFrame* aFrame, PRInt32 aCount, PRUint16 flags)
{
  mFirstChild = aFrame;
  mChildCount = aCount;
  mState = LINE_IS_DIRTY | LINE_NEED_DID_REFLOW | flags;
  mFloaters = nsnull;
  mNext = nsnull;
  mBounds.SetRect(0,0,0,0);
  mCombinedArea.SetRect(0,0,0,0);
  mCarriedOutTopMargin = 0;
  mCarriedOutBottomMargin = 0;
  mBreakType = NS_STYLE_CLEAR_NONE;
}

nsLineBox::~nsLineBox()
{
  if (nsnull != mFloaters) {
    delete mFloaters;
  }
}

static void
ListFloaters(FILE* out, PRInt32 aIndent, nsVoidArray* aFloaters)
{
  PRInt32 j, i, n = aFloaters->Count();
  for (i = 0; i < n; i++) {
    for (j = aIndent; --j >= 0; ) fputs("  ", out);
    nsPlaceholderFrame* ph = (nsPlaceholderFrame*) aFloaters->ElementAt(i);
    if (nsnull != ph) {
      fprintf(out, "placeholder@%p\n", ph);
      nsIFrame* frame = ph->GetAnchoredItem();
      if (nsnull != frame) {
        frame->List(out, aIndent + 1, nsnull);
      }
    }
  }
}

char*
nsLineBox::StateToString(char* aBuf, PRInt32 aBufSize) const
{
  PR_snprintf(aBuf, aBufSize, "%s,%s",
              (mState & LINE_IS_DIRTY) ? "dirty" : "clean",
              (mState & LINE_IS_BLOCK) ? "block" : "inline");
  return aBuf;
}

void
nsLineBox::List(FILE* out, PRInt32 aIndent, nsIListFilter *aFilter,
               PRBool aOutputMe) const
{
  PRInt32 i;

  if (aOutputMe) {
    for (i = aIndent; --i >= 0; ) fputs("  ", out);
    char cbuf[100];
    fprintf(out, "line %p: count=%d state=%s ",
            this, ChildCount(), StateToString(cbuf, sizeof(cbuf)));
    if (0 != mCarriedOutTopMargin) {
      fprintf(out, "tm=%d ", mCarriedOutTopMargin);
    }
    if (0 != mCarriedOutBottomMargin) {
      fprintf(out, "bm=%d ", mCarriedOutBottomMargin);
    }
    out << mBounds;
    fprintf(out, " ca=");
    out << mCombinedArea;
    fprintf(out, " <\n");
  }

  nsIFrame* frame = mFirstChild;
  PRInt32 n = ChildCount();
  while (--n >= 0) {
    frame->List(out, aIndent + 1, aFilter);
    frame->GetNextSibling(frame);
  }

  if (aOutputMe) {
    for (i = aIndent; --i >= 0; ) fputs("  ", out);
    if (nsnull != mFloaters) {
      fputs("> floaters <\n", out);
      ListFloaters(out, aIndent + 1, mFloaters);
      for (i = aIndent; --i >= 0; ) fputs("  ", out);
    }
    fputs(">\n", out);
  }
}

nsIFrame*
nsLineBox::LastChild() const
{
  nsIFrame* frame = mFirstChild;
  PRInt32 n = ChildCount() - 1;
  while (--n >= 0) {
    frame->GetNextSibling(frame);
  }
  return frame;
}

PRBool
nsLineBox::IsLastChild(nsIFrame* aFrame) const
{
  nsIFrame* lastFrame = LastChild();
  return aFrame == lastFrame;
}

PRBool
nsLineBox::Contains(nsIFrame* aFrame) const
{
  PRInt32 n = ChildCount();
  nsIFrame* frame = mFirstChild;
  while (--n >= 0) {
    if (frame == aFrame) {
      return PR_TRUE;
    }
    frame->GetNextSibling(frame);
  }
  return PR_FALSE;
}

#if 0
static PRInt32
LengthOf(nsIFrame* aFrame)
{
  PRInt32 result = 0;
  while (nsnull != aFrame) {
    result++;
    aFrame->GetNextSibling(aFrame);
  }
  return result;
}

void
nsLineBox::Verify()
{
  nsIFrame* lastFrame = LastChild();
  if (nsnull != lastFrame) {
    nsIFrame* nextInFlow;
    lastFrame->GetNextInFlow(nextInFlow);
    if (nsnull != mNext) {
      nsIFrame* nextSibling;
      lastFrame->GetNextSibling(nextSibling);
      NS_ASSERTION(mNext->mFirstChild == nextSibling, "bad line list");
    }
  }
  PRInt32 len = LengthOf(mFirstChild);
  NS_ASSERTION(len >= ChildCount(), "bad mChildCount");
}

static void
VerifyLines(nsLineBox* aLine)
{
  while (nsnull != aLine) {
    aLine->Verify();
    aLine = aLine->mNext;
  }
}

static void
VerifyChildCount(nsLineBox* aLines, PRBool aEmptyOK = PR_FALSE)
{
  if (nsnull != aLines) {
    PRInt32 childCount = LengthOf(aLines->mFirstChild);
    PRInt32 sum = 0;
    nsLineBox* line = aLines;
    while (nsnull != line) {
      if (!aEmptyOK) {
        NS_ASSERTION(0 != line->ChildCount(), "empty line left in line list");
      }
      sum += line->ChildCount();
      line = line->mNext;
    }
    if (sum != childCount) {
      printf("Bad sibling list/line mChildCount's\n");
      nsLineBox* line = aLines;
      while (nsnull != line) {
        line->List(stdout, 1);
        if (nsnull != line->mNext) {
          nsIFrame* lastFrame = line->LastChild();
          if (nsnull != lastFrame) {
            nsIFrame* nextSibling;
            lastFrame->GetNextSibling(nextSibling);
            if (line->mNext->mFirstChild != nextSibling) {
              printf("  [list broken: nextSibling=%p mNext->mFirstChild=%p]\n",
                     nextSibling, line->mNext->mFirstChild);
            }
          }
        }
        line = line->mNext;
      }
      NS_ASSERTION(sum == childCount, "bad sibling list/line mChildCount's");
    }
  }
}
#endif

void
nsLineBox::DeleteLineList(nsIPresContext& aPresContext, nsLineBox* aLine)
{
  if (nsnull != aLine) {
    // Delete our child frames before doing anything else. In particular
    // we do all of this before our base class releases it's hold on the
    // view.
    for (nsIFrame* child = aLine->mFirstChild; child; ) {
      nsIFrame* nextChild;
      child->GetNextSibling(nextChild);
      child->DeleteFrame(aPresContext);
      child = nextChild;
    }

    while (nsnull != aLine) {
      nsLineBox* next = aLine->mNext;
      delete aLine;
      aLine = next;
    }
  }
}

nsLineBox*
nsLineBox::LastLine(nsLineBox* aLine)
{
  if (nsnull != aLine) {
    while (nsnull != aLine->mNext) {
      aLine = aLine->mNext;
    }
  }
  return aLine;
}

nsLineBox*
nsLineBox::FindLineContaining(nsLineBox* aLine, nsIFrame* aFrame)
{
  while (nsnull != aLine) {
    if (aLine->Contains(aFrame)) {
      return aLine;
    }
    aLine = aLine->mNext;
  }
  return nsnull;
}

void
nsLineBox::UnplaceFloaters(nsISpaceManager* aSpaceManager)
{
  if (nsnull != mFloaters) {
    PRInt32 i, n = mFloaters->Count();
    for (i = 0; i < n; i++) {
      nsPlaceholderFrame* pf = (nsPlaceholderFrame*) mFloaters->ElementAt(i);
      nsIFrame* floater = pf->GetAnchoredItem();
      aSpaceManager->RemoveRegion(floater);
    }
  }
}

#ifdef NS_DEBUG
PRBool
nsLineBox::CheckIsBlock() const
{
  nsIFrame* frame = mFirstChild;
  const nsStyleDisplay* display;
  frame->GetStyleData(eStyleStruct_Display,
                      (const nsStyleStruct*&) display);
  const nsStylePosition* position;
  frame->GetStyleData(eStyleStruct_Position,
                      (const nsStyleStruct*&) position);
  PRBool isBlock = nsLineLayout::TreatFrameAsBlock(display, position);
  return isBlock == IsBlock();
}
#endif