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465 lines
11 KiB
C++
465 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#include "nsLineBox.h"
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#include "nsISpaceManager.h"
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#include "nsIStyleContext.h"
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#include "nsLineLayout.h"
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#include "prprf.h"
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nsLineBox::nsLineBox(nsIFrame* aFrame, PRInt32 aCount, PRUint16 flags)
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{
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mFirstChild = aFrame;
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mChildCount = aCount;
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mState = LINE_IS_DIRTY | LINE_NEED_DID_REFLOW | flags;
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mFloaters = nsnull;
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mNext = nsnull;
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mBounds.SetRect(0,0,0,0);
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mCombinedArea.SetRect(0,0,0,0);
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//XXX mCarriedOutTopMargin = 0;
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mCarriedOutBottomMargin = 0;
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mBreakType = NS_STYLE_CLEAR_NONE;
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}
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nsLineBox::~nsLineBox()
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{
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if (nsnull != mFloaters) {
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delete mFloaters;
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}
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}
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static void
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ListFloaters(FILE* out, PRInt32 aIndent, nsVoidArray* aFloaters)
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{
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nsAutoString frameName;
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PRInt32 j, i, n = aFloaters->Count();
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for (i = 0; i < n; i++) {
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for (j = aIndent; --j >= 0; ) fputs(" ", out);
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nsPlaceholderFrame* ph = (nsPlaceholderFrame*) aFloaters->ElementAt(i);
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if (nsnull != ph) {
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fprintf(out, "placeholder@%p ", ph);
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nsIFrame* frame = ph->GetOutOfFlowFrame();
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if (nsnull != frame) {
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frame->GetFrameName(frameName);
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fputs(frameName, out);
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}
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fprintf(out, "\n");
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}
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}
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}
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char*
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nsLineBox::StateToString(char* aBuf, PRInt32 aBufSize) const
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{
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PR_snprintf(aBuf, aBufSize, "%s,%s[0x%x]",
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(mState & LINE_IS_DIRTY) ? "dirty" : "clean",
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(mState & LINE_IS_BLOCK) ? "block" : "inline",
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mState);
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return aBuf;
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}
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void
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nsLineBox::List(FILE* out, PRInt32 aIndent) const
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{
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PRInt32 i;
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for (i = aIndent; --i >= 0; ) fputs(" ", out);
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char cbuf[100];
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fprintf(out, "line %p: count=%d state=%s ",
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this, ChildCount(), StateToString(cbuf, sizeof(cbuf)));
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#if XXX
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if (0 != mCarriedOutTopMargin) {
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fprintf(out, "tm=%d ", mCarriedOutTopMargin);
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}
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#endif
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if (0 != mCarriedOutBottomMargin) {
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fprintf(out, "bm=%d ", mCarriedOutBottomMargin);
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}
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fprintf(out, "{%d,%d,%d,%d} ca={%d,%d,%d,%d}",
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mBounds.x, mBounds.y, mBounds.width, mBounds.height,
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mCombinedArea.x, mCombinedArea.y,
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mCombinedArea.width, mCombinedArea.height);
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fprintf(out, " <\n");
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nsIFrame* frame = mFirstChild;
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PRInt32 n = ChildCount();
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while (--n >= 0) {
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frame->List(out, aIndent + 1);
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frame->GetNextSibling(&frame);
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}
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for (i = aIndent; --i >= 0; ) fputs(" ", out);
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if (nsnull != mFloaters) {
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fputs("> floaters <\n", out);
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ListFloaters(out, aIndent + 1, mFloaters);
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for (i = aIndent; --i >= 0; ) fputs(" ", out);
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}
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fputs(">\n", out);
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}
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nsIFrame*
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nsLineBox::LastChild() const
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{
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nsIFrame* frame = mFirstChild;
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PRInt32 n = ChildCount() - 1;
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while (--n >= 0) {
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frame->GetNextSibling(&frame);
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}
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return frame;
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}
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PRBool
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nsLineBox::IsLastChild(nsIFrame* aFrame) const
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{
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nsIFrame* lastFrame = LastChild();
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return aFrame == lastFrame;
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}
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PRInt32
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nsLineBox::IndexOf(nsIFrame* aFrame) const
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{
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PRInt32 i, n = ChildCount();
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nsIFrame* frame = mFirstChild;
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for (i = 0; i < n; i++) {
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if (frame == aFrame) {
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return i;
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}
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frame->GetNextSibling(&frame);
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}
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return -1;
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}
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void
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nsLineBox::DeleteLineList(nsIPresContext& aPresContext, nsLineBox* aLine)
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{
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if (nsnull != aLine) {
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// Delete our child frames before doing anything else. In particular
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// we do all of this before our base class releases it's hold on the
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// view.
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for (nsIFrame* child = aLine->mFirstChild; child; ) {
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nsIFrame* nextChild;
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child->GetNextSibling(&nextChild);
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child->Destroy(aPresContext);
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child = nextChild;
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}
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while (nsnull != aLine) {
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nsLineBox* next = aLine->mNext;
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delete aLine;
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aLine = next;
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}
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}
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}
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nsLineBox*
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nsLineBox::LastLine(nsLineBox* aLine)
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{
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if (nsnull != aLine) {
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while (nsnull != aLine->mNext) {
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aLine = aLine->mNext;
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}
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}
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return aLine;
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}
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nsLineBox*
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nsLineBox::FindLineContaining(nsLineBox* aLine, nsIFrame* aFrame,
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PRInt32* aFrameIndexInLine)
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{
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NS_PRECONDITION(aFrameIndexInLine && aLine && aFrame, "null ptr");
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while (nsnull != aLine) {
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PRInt32 ix = aLine->IndexOf(aFrame);
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if (ix >= 0) {
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*aFrameIndexInLine = ix;
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return aLine;
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}
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aLine = aLine->mNext;
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}
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*aFrameIndexInLine = -1;
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return nsnull;
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}
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#ifdef NS_DEBUG
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PRBool
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nsLineBox::CheckIsBlock() const
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{
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PRBool isBlock = nsLineLayout::TreatFrameAsBlock(mFirstChild);
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return isBlock == IsBlock();
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}
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#endif
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//----------------------------------------------------------------------
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static NS_DEFINE_IID(kILineIteratorIID, NS_ILINE_ITERATOR_IID);
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static nsLineBox* gDummyLines[1];
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nsLineIterator::nsLineIterator()
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{
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NS_INIT_REFCNT();
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mLines = gDummyLines;
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mNumLines = 0;
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mIndex = 0;
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mRightToLeft = PR_FALSE;
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}
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nsLineIterator::~nsLineIterator()
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{
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if (mLines != gDummyLines) {
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delete [] mLines;
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}
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}
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NS_IMPL_ISUPPORTS(nsLineIterator, kILineIteratorIID)
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nsresult
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nsLineIterator::Init(nsLineBox* aLines, PRBool aRightToLeft)
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{
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mRightToLeft = aRightToLeft;
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// Count the lines
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PRInt32 numLines = 0;
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nsLineBox* line = aLines;
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while (line) {
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numLines++;
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line = line->mNext;
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}
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if (0 == numLines) {
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// Use gDummyLines so that we don't need null pointer checks in
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// the accessor methods
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mLines = gDummyLines;
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return NS_OK;
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}
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// Make a linear array of the lines
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mLines = new nsLineBox*[numLines];
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if (!mLines) {
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// Use gDummyLines so that we don't need null pointer checks in
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// the accessor methods
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mLines = gDummyLines;
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return NS_ERROR_OUT_OF_MEMORY;
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}
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nsLineBox** lp = mLines;
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line = aLines;
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while (line) {
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*lp++ = line;
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line = line->mNext;
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}
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mNumLines = numLines;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLineIterator::GetNumLines(PRInt32* aResult)
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{
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NS_PRECONDITION(aResult, "null OUT ptr");
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if (!aResult) {
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return NS_ERROR_NULL_POINTER;
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}
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*aResult = mNumLines;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLineIterator::GetDirection(PRBool* aIsRightToLeft)
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{
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NS_PRECONDITION(aIsRightToLeft, "null OUT ptr");
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if (!aIsRightToLeft) {
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return NS_ERROR_NULL_POINTER;
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}
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*aIsRightToLeft = mRightToLeft;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLineIterator::GetLine(PRInt32 aLineNumber,
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nsIFrame** aFirstFrameOnLine,
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PRInt32* aNumFramesOnLine,
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nsRect& aLineBounds)
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{
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NS_PRECONDITION(aFirstFrameOnLine && aNumFramesOnLine, "null OUT ptr");
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if (!aFirstFrameOnLine || !aNumFramesOnLine) {
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return NS_ERROR_NULL_POINTER;
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}
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if ((aLineNumber < 0) || (aLineNumber >= mNumLines)) {
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*aFirstFrameOnLine = nsnull;
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*aNumFramesOnLine = 0;
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aLineBounds.SetRect(0, 0, 0, 0);
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return NS_OK;
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}
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nsLineBox* line = mLines[aLineNumber];
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*aFirstFrameOnLine = line->mFirstChild;
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*aNumFramesOnLine = line->mChildCount;
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aLineBounds = line->mBounds;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLineIterator::FindLineContaining(nsIFrame* aFrame,
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PRInt32* aLineNumberResult)
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{
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nsLineBox* line = mLines[0];
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PRInt32 lineNumber = 0;
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while (line) {
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if (line->Contains(aFrame)) {
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*aLineNumberResult = lineNumber;
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return NS_OK;
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}
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line = line->mNext;
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lineNumber++;
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}
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*aLineNumberResult = -1;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLineIterator::FindLineAt(nscoord aY,
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PRInt32* aLineNumberResult)
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{
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nsLineBox* line = mLines[0];
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if (!line || (aY < line->mBounds.y)) {
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*aLineNumberResult = -1;
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return NS_OK;
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}
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PRInt32 lineNumber = 0;
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while (line) {
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if ((aY >= line->mBounds.y) && (aY < line->mBounds.YMost())) {
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*aLineNumberResult = lineNumber;
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return NS_OK;
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}
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line = line->mNext;
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lineNumber++;
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}
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*aLineNumberResult = mNumLines;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLineIterator::FindFrameAt(PRInt32 aLineNumber,
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nscoord aX,
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nsIFrame** aFrameFound,
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PRBool* aXIsBeforeFirstFrame,
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PRBool* aXIsAfterLastFrame)
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{
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NS_PRECONDITION(aFrameFound && aXIsBeforeFirstFrame && aXIsAfterLastFrame,
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"null OUT ptr");
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if (!aFrameFound || !aXIsBeforeFirstFrame || !aXIsAfterLastFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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if ((aLineNumber < 0) || (aLineNumber >= mNumLines)) {
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return NS_ERROR_INVALID_ARG;
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}
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nsLineBox* line = mLines[aLineNumber];
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if (!line) {
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*aFrameFound = nsnull;
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*aXIsBeforeFirstFrame = PR_TRUE;
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*aXIsAfterLastFrame = PR_FALSE;
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return NS_OK;
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}
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if (aX < line->mBounds.x) {
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nsIFrame* frame;
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if (mRightToLeft) {
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frame = line->LastChild();
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}
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else {
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frame = line->mFirstChild;
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}
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*aFrameFound = frame;
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*aXIsBeforeFirstFrame = PR_TRUE;
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*aXIsAfterLastFrame = PR_FALSE;
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return NS_OK;
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}
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else if (aX >= line->mBounds.XMost()) {
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nsIFrame* frame;
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if (mRightToLeft) {
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frame = line->mFirstChild;
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}
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else {
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frame = line->LastChild();
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}
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*aFrameFound = frame;
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*aXIsBeforeFirstFrame = PR_FALSE;
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*aXIsAfterLastFrame = PR_TRUE;
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return NS_OK;
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}
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// Find the frame closest to the X coordinate. Gaps can occur
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// between frames (because of margins) so we split the gap in two
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// when checking.
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*aXIsBeforeFirstFrame = PR_FALSE;
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*aXIsAfterLastFrame = PR_FALSE;
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nsRect r1, r2;
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nsIFrame* frame = line->mFirstChild;
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PRInt32 n = line->mChildCount;
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if (mRightToLeft) {
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while (--n >= 0) {
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nsIFrame* nextFrame;
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frame->GetNextSibling(&nextFrame);
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frame->GetRect(r1);
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if (aX > r1.x) {
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break;
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}
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if (nextFrame) {
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nextFrame->GetRect(r2);
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if (aX > r2.XMost()) {
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nscoord rightEdge = r2.XMost();
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nscoord delta = r1.x - rightEdge;
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if (aX < rightEdge + delta/2) {
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frame = nextFrame;
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}
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break;
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}
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}
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else {
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*aXIsBeforeFirstFrame = PR_TRUE;
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}
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frame = nextFrame;
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}
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}
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else {
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while (--n >= 0) {
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nsIFrame* nextFrame;
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frame->GetNextSibling(&nextFrame);
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frame->GetRect(r1);
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if (aX < r1.XMost()) {
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break;
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}
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if (nextFrame) {
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nextFrame->GetRect(r2);
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if (aX < r2.x) {
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nscoord rightEdge = r1.XMost();
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nscoord delta = r2.x - rightEdge;
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if (aX >= rightEdge + delta/2) {
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frame = nextFrame;
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}
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break;
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}
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}
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else {
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*aXIsAfterLastFrame = PR_TRUE;
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}
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frame = nextFrame;
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}
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}
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*aFrameFound = frame;
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return NS_OK;
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}
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