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gecko-dev/layout/tables/nsTableRowGroupFrame.cpp

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/* -*- 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 "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsTableRowGroupFrame.h"
#include "nsTableRowFrame.h"
#include "nsTableCellFrame.h"
#include "nsIRenderingContext.h"
#include "nsIPresContext.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIContent.h"
#include "nsIContentDelegate.h"
#include "nsIView.h"
#include "nsIPtr.h"
#include "nsIReflowCommand.h"
#ifdef NS_DEBUG
static PRBool gsDebug1 = PR_FALSE;
static PRBool gsDebug2 = PR_FALSE;
//#define NOISY
//#define NOISY_FLOW
#else
static const PRBool gsDebug1 = PR_FALSE;
static const PRBool gsDebug2 = PR_FALSE;
#endif
NS_DEF_PTR(nsIStyleContext);
NS_DEF_PTR(nsIContent);
/* ----------- RowGroupReflowState ---------- */
struct RowGroupReflowState {
// Our reflow state
const nsReflowState& reflowState;
// The body's available size (computed from the body's parent)
nsSize availSize;
// Margin tracking information
nscoord prevMaxPosBottomMargin;
nscoord prevMaxNegBottomMargin;
// Flags for whether the max size is unconstrained
PRBool unconstrainedWidth;
PRBool unconstrainedHeight;
// Running y-offset
nscoord y;
// Flag used to set aMaxElementSize to my first row
PRBool firstRow;
// Remember the height of the first row, because it's our maxElementHeight (plus header/footers)
nscoord firstRowHeight;
RowGroupReflowState(nsIPresContext* aPresContext,
const nsReflowState& aReflowState)
: reflowState(aReflowState)
{
availSize.width = reflowState.maxSize.width;
availSize.height = reflowState.maxSize.height;
prevMaxPosBottomMargin = 0;
prevMaxNegBottomMargin = 0;
y=0; // border/padding/margin???
unconstrainedWidth = PRBool(reflowState.maxSize.width == NS_UNCONSTRAINEDSIZE);
unconstrainedHeight = PRBool(reflowState.maxSize.height == NS_UNCONSTRAINEDSIZE);
firstRow = PR_TRUE;
firstRowHeight=0;
}
~RowGroupReflowState() {
}
};
/* ----------- nsTableRowGroupFrame ---------- */
nsTableRowGroupFrame::nsTableRowGroupFrame(nsIContent* aContent, nsIFrame* aParentFrame)
: nsContainerFrame(aContent, aParentFrame)
{
mType = aContent->GetTag(); // mType: REFCNT++
}
nsTableRowGroupFrame::~nsTableRowGroupFrame()
{
if (nsnull!=mType)
NS_RELEASE(mType); // mType: REFCNT--
}
NS_METHOD nsTableRowGroupFrame::GetRowGroupType(nsIAtom *& aType)
{
NS_ADDREF(mType);
aType=mType;
return NS_OK;
}
NS_METHOD nsTableRowGroupFrame::Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
// for debug...
/*
if (nsIFrame::GetShowFrameBorders()) {
aRenderingContext.SetColor(NS_RGB(128,0,0));
aRenderingContext.DrawRect(0, 0, mRect.width, mRect.height);
}
*/
PaintChildren(aPresContext, aRenderingContext, aDirtyRect);
return NS_OK;
}
// aDirtyRect is in our coordinate system
// child rect's are also in our coordinate system
/** overloaded method from nsContainerFrame. The difference is that
* we don't want to clip our children, so a cell can do a rowspan
*/
void nsTableRowGroupFrame::PaintChildren(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
nsIFrame* kid = mFirstChild;
while (nsnull != kid) {
nsIView *pView;
kid->GetView(pView);
if (nsnull == pView) {
nsRect kidRect;
kid->GetRect(kidRect);
nsRect damageArea(aDirtyRect);
// Translate damage area into kid's coordinate system
nsRect kidDamageArea(damageArea.x - kidRect.x, damageArea.y - kidRect.y,
damageArea.width, damageArea.height);
aRenderingContext.PushState();
aRenderingContext.Translate(kidRect.x, kidRect.y);
kid->Paint(aPresContext, aRenderingContext, kidDamageArea);
if (nsIFrame::GetShowFrameBorders()) {
aRenderingContext.SetColor(NS_RGB(255,0,0));
aRenderingContext.DrawRect(0, 0, kidRect.width, kidRect.height);
}
aRenderingContext.PopState();
}
else
NS_RELEASE(pView);
kid->GetNextSibling(kid);
}
}
// Collapse child's top margin with previous bottom margin
nscoord nsTableRowGroupFrame::GetTopMarginFor(nsIPresContext* aCX,
RowGroupReflowState& aState,
const nsMargin& aKidMargin)
{
nscoord margin;
nscoord maxNegTopMargin = 0;
nscoord maxPosTopMargin = 0;
if ((margin = aKidMargin.top) < 0) {
maxNegTopMargin = -margin;
} else {
maxPosTopMargin = margin;
}
nscoord maxPos = PR_MAX(aState.prevMaxPosBottomMargin, maxPosTopMargin);
nscoord maxNeg = PR_MAX(aState.prevMaxNegBottomMargin, maxNegTopMargin);
margin = maxPos - maxNeg;
return margin;
}
// Position and size aKidFrame and update our reflow state. The origin of
// aKidRect is relative to the upper-left origin of our frame, and includes
// any left/top margin.
void nsTableRowGroupFrame::PlaceChild( nsIPresContext* aPresContext,
RowGroupReflowState& aState,
nsIFrame* aKidFrame,
const nsRect& aKidRect,
nsSize* aMaxElementSize,
nsSize& aKidMaxElementSize)
{
if (PR_TRUE==gsDebug1)
printf ("rowgroup: placing row at %d, %d, %d, %d\n",
aKidRect.x, aKidRect.y, aKidRect.width, aKidRect.height);
// Place and size the child
aKidFrame->SetRect(aKidRect);
// Adjust the running y-offset
aState.y += aKidRect.height;
// If our height is constrained then update the available height
if (PR_FALSE == aState.unconstrainedHeight) {
aState.availSize.height -= aKidRect.height;
}
// Update the maximum element size
if (PR_TRUE==aState.firstRow)
{
aState.firstRow = PR_FALSE;
aState.firstRowHeight = aKidRect.height;
if (nsnull != aMaxElementSize) {
aMaxElementSize->width = aKidMaxElementSize.width;
aMaxElementSize->height = aKidMaxElementSize.height;
}
}
}
/**
* Reflow the frames we've already created
*
* @param aPresContext presentation context to use
* @param aState current inline state
* @return true if we successfully reflowed all the mapped children and false
* otherwise, e.g. we pushed children to the next in flow
*/
PRBool nsTableRowGroupFrame::ReflowMappedChildren( nsIPresContext* aPresContext,
RowGroupReflowState& aState,
nsSize* aMaxElementSize)
{
#ifdef NS_DEBUG
VerifyLastIsComplete();
#endif
#ifdef NOISY
ListTag(stdout);
printf(": reflow mapped (childCount=%d) [%d,%d,%c]\n",
mChildCount,
mFirstContentOffset, mLastContentOffset,
(mLastContentIsComplete ? 'T' : 'F'));
#ifdef NOISY_FLOW
{
nsTableRowGroupFrame* flow = (nsTableRowGroupFrame*) mNextInFlow;
while (flow != 0) {
printf(" %p: [%d,%d,%c]\n",
flow, flow->mFirstContentOffset, flow->mLastContentOffset,
(flow->mLastContentIsComplete ? 'T' : 'F'));
flow = (nsTableRowGroupFrame*) flow->mNextInFlow;
}
}
#endif
#endif
NS_PRECONDITION(nsnull != mFirstChild, "no children");
PRInt32 childCount = 0;
nsIFrame* prevKidFrame = nsnull;
// Remember our original mLastContentIsComplete so that if we end up
// having to push children, we have the correct value to hand to
// PushChildren.
PRBool lastContentIsComplete = mLastContentIsComplete;
nsSize kidMaxElementSize;
nsSize* pKidMaxElementSize = (nsnull != aMaxElementSize) ? &kidMaxElementSize : nsnull;
PRBool result = PR_TRUE;
for (nsIFrame* kidFrame = mFirstChild; nsnull != kidFrame; ) {
nsSize kidAvailSize(aState.availSize);
if (0>=kidAvailSize.height)
kidAvailSize.height = 1; // XXX: HaCk - we don't handle negative heights yet
nsReflowMetrics desiredSize(pKidMaxElementSize);
desiredSize.width=desiredSize.height=desiredSize.ascent=desiredSize.descent=0;
nsReflowStatus status;
// Get top margin for this kid
nsIContentPtr kid;
kidFrame->GetContent(kid.AssignRef());
nsIStyleContextPtr kidSC;
kidFrame->GetStyleContext(aPresContext, kidSC.AssignRef());
const nsStyleSpacing* kidSpacing = (const nsStyleSpacing*)
kidSC->GetStyleData(eStyleStruct_Spacing);
nsMargin kidMargin;
kidSpacing->CalcMarginFor(this, kidMargin);
nscoord topMargin = GetTopMarginFor(aPresContext, aState, kidMargin);
nscoord bottomMargin = kidMargin.bottom;
// Figure out the amount of available size for the child (subtract
// off the top margin we are going to apply to it)
if (PR_FALSE == aState.unconstrainedHeight) {
kidAvailSize.height -= topMargin;
}
// Subtract off for left and right margin
if (PR_FALSE == aState.unconstrainedWidth) {
kidAvailSize.width -= kidMargin.left + kidMargin.right;
}
// Reflow the child into the available space
nsReflowState kidReflowState(kidFrame, aState.reflowState, kidAvailSize,
eReflowReason_Resize);
kidFrame->WillReflow(*aPresContext);
kidFrame->MoveTo(kidMargin.left, aState.y + topMargin);
status = ReflowChild(kidFrame, aPresContext, desiredSize, kidReflowState);
// Did the child fit?
if ((kidFrame != mFirstChild) &&
((kidAvailSize.height <= 0) ||
(desiredSize.height > kidAvailSize.height)))
{
// The child's height is too big to fit at all in our remaining space,
// and it's not our first child.
//
// Note that if the width is too big that's okay and we allow the
// child to extend horizontally outside of the reflow area
// Since we are giving the next-in-flow our last child, we
// give it our original mLastContentIsComplete, too (in case we
// are pushing into an empty next-in-flow)
PushChildren(kidFrame, prevKidFrame, lastContentIsComplete);
SetLastContentOffset(prevKidFrame);
// Our mLastContentIsComplete was already set by the last kid we
// reflowed reflow's status
result = PR_FALSE;
break;
}
// Place the child after taking into account it's margin
nsRect kidRect (kidMargin.left, aState.y, desiredSize.width, desiredSize.height);
PlaceChild(aPresContext, aState, kidFrame, kidRect, aMaxElementSize,
kidMaxElementSize);
if (bottomMargin < 0) {
aState.prevMaxNegBottomMargin = -bottomMargin;
} else {
aState.prevMaxPosBottomMargin = bottomMargin;
}
childCount++;
// Remember where we just were in case we end up pushing children
prevKidFrame = kidFrame;
// Update mLastContentIsComplete now that this kid fits
mLastContentIsComplete = NS_FRAME_IS_COMPLETE(status);
/* Row groups should not create continuing frames for rows
* unless they absolutely have to!
* check to see if this is absolutely necessary (with new params from troy)
* otherwise PushChildren and bail.
*/
// Special handling for incomplete children
if (NS_FRAME_IS_NOT_COMPLETE(status)) {
// XXX It's good to assume that we might still have room
// even if the child didn't complete (floaters will want this)
nsIFrame* kidNextInFlow;
kidFrame->GetNextInFlow(kidNextInFlow);
PRBool lastContentIsComplete = mLastContentIsComplete;
if (nsnull == kidNextInFlow) {
// No the child isn't complete, and it doesn't have a next in flow so
// create a continuing frame. This hooks the child into the flow.
nsIFrame* continuingFrame;
nsIStyleContext* kidSC;
kidFrame->GetStyleContext(aPresContext, kidSC);
kidFrame->CreateContinuingFrame(aPresContext, this, kidSC,
continuingFrame);
NS_RELEASE(kidSC);
// Insert the frame. We'll reflow it next pass through the loop
nsIFrame* nextSib;
kidFrame->GetNextSibling(nextSib);
continuingFrame->SetNextSibling(nextSib);
kidFrame->SetNextSibling(continuingFrame);
if (nsnull == nextSib) {
// Assume that the continuation frame we just created is
// complete, for now. It will get reflowed by our
// next-in-flow (we are going to push it now)
lastContentIsComplete = PR_TRUE;
}
}
// We've used up all of our available space so push the remaining
// children to the next-in-flow
nsIFrame* nextSibling;
kidFrame->GetNextSibling(nextSibling);
if (nsnull != nextSibling) {
PushChildren(nextSibling, kidFrame, lastContentIsComplete);
SetLastContentOffset(prevKidFrame);
}
result = PR_FALSE;
break;
}
// Add back in the left and right margins, because one row does not
// impact another row's width
if (PR_FALSE == aState.unconstrainedWidth) {
kidAvailSize.width += kidMargin.left + kidMargin.right;
}
// Get the next child
kidFrame->GetNextSibling(kidFrame);
}
// Update the child count
mChildCount = childCount;
#ifdef NS_DEBUG
NS_POSTCONDITION(LengthOf(mFirstChild) == mChildCount, "bad child count");
nsIFrame* lastChild;
PRInt32 lastIndexInParent;
LastChild(lastChild);
lastChild->GetContentIndex(lastIndexInParent);
NS_POSTCONDITION(lastIndexInParent == mLastContentOffset, "bad last content offset");
#endif
#ifdef NS_DEBUG
VerifyLastIsComplete();
#endif
#ifdef NOISY
ListTag(stdout);
printf(": reflow mapped %sok (childCount=%d) [%d,%d,%c]\n",
(result ? "" : "NOT "),
mChildCount,
mFirstContentOffset, mLastContentOffset,
(mLastContentIsComplete ? 'T' : 'F'));
#ifdef NOISY_FLOW
{
nsTableRowGroupFrame* flow = (nsTableRowGroupFrame*) mNextInFlow;
while (flow != 0) {
printf(" %p: [%d,%d,%c]\n",
flow, flow->mFirstContentOffset, flow->mLastContentOffset,
(flow->mLastContentIsComplete ? 'T' : 'F'));
flow = (nsTableRowGroupFrame*) flow->mNextInFlow;
}
}
#endif
#endif
return result;
}
/**
* Try and pull-up frames from our next-in-flow
*
* @param aPresContext presentation context to use
* @param aState current inline state
* @return true if we successfully pulled-up all the children and false
* otherwise, e.g. child didn't fit
*/
PRBool nsTableRowGroupFrame::PullUpChildren(nsIPresContext* aPresContext,
RowGroupReflowState& aState,
nsSize* aMaxElementSize)
{
#ifdef NS_DEBUG
VerifyLastIsComplete();
#endif
#ifdef NOISY
ListTag(stdout);
printf(": pullup (childCount=%d) [%d,%d,%c]\n",
mChildCount,
mFirstContentOffset, mLastContentOffset,
(mLastContentIsComplete ? 'T' : 'F'));
#ifdef NOISY_FLOW
{
nsTableRowGroupFrame* flow = (nsTableRowGroupFrame*) mNextInFlow;
while (flow != 0) {
printf(" %p: [%d,%d,%c]\n",
flow, flow->mFirstContentOffset, flow->mLastContentOffset,
(flow->mLastContentIsComplete ? 'T' : 'F'));
flow = (nsTableRowGroupFrame*) flow->mNextInFlow;
}
}
#endif
#endif
nsTableRowGroupFrame* nextInFlow = (nsTableRowGroupFrame*)mNextInFlow;
nsSize kidMaxElementSize;
nsSize* pKidMaxElementSize = (nsnull != aMaxElementSize) ? &kidMaxElementSize : nsnull;
#ifdef NS_DEBUG
PRInt32 kidIndex = NextChildOffset();
#endif
nsIFrame* prevKidFrame;
LastChild(prevKidFrame);
// This will hold the prevKidFrame's mLastContentIsComplete
// status. If we have to push the frame that follows prevKidFrame
// then this will become our mLastContentIsComplete state. Since
// prevKidFrame is initially our last frame, it's completion status
// is our mLastContentIsComplete value.
PRBool prevLastContentIsComplete = mLastContentIsComplete;
PRBool result = PR_TRUE;
while (nsnull != nextInFlow) {
nsReflowMetrics kidSize(pKidMaxElementSize);
kidSize.width=kidSize.height=kidSize.ascent=kidSize.descent=0;
nsReflowStatus status;
// Get the next child
nsIFrame* kidFrame = nextInFlow->mFirstChild;
// Any more child frames?
if (nsnull == kidFrame) {
// No. Any frames on its overflow list?
if (nsnull != nextInFlow->mOverflowList) {
// Move the overflow list to become the child list
// NS_ABORT();
nextInFlow->AppendChildren(nextInFlow->mOverflowList);
nextInFlow->mOverflowList = nsnull;
kidFrame = nextInFlow->mFirstChild;
} else {
// We've pulled up all the children, so move to the next-in-flow.
nextInFlow->GetNextInFlow((nsIFrame*&)nextInFlow);
continue;
}
}
// See if the child fits in the available space. If it fits or
// it's splittable then reflow it. The reason we can't just move
// it is that we still need ascent/descent information
nsSize kidFrameSize;
nsSplittableType kidIsSplittable;
kidFrame->GetSize(kidFrameSize);
kidFrame->IsSplittable(kidIsSplittable);
if ((kidFrameSize.height > aState.availSize.height) &&
NS_FRAME_IS_NOT_SPLITTABLE(kidIsSplittable)) {
result = PR_FALSE;
mLastContentIsComplete = prevLastContentIsComplete;
break;
}
nsReflowState kidReflowState(kidFrame, aState.reflowState, aState.availSize,
eReflowReason_Resize);
kidFrame->WillReflow(*aPresContext);
status = ReflowChild(kidFrame, aPresContext, kidSize, kidReflowState);
// Did the child fit?
if ((kidSize.height > aState.availSize.height) && (nsnull != mFirstChild)) {
// The child is too wide to fit in the available space, and it's
// not our first child
result = PR_FALSE;
mLastContentIsComplete = prevLastContentIsComplete;
break;
}
// Place the child
//aState.y += topMargin;
nsRect kidRect (0, 0, kidSize.width, kidSize.height);
//kidRect.x += kidMol->margin.left;
kidRect.y += aState.y;
PlaceChild(aPresContext, aState, kidFrame, kidRect, aMaxElementSize, *pKidMaxElementSize);
// Remove the frame from its current parent
kidFrame->GetNextSibling(nextInFlow->mFirstChild);
nextInFlow->mChildCount--;
// Update the next-in-flows first content offset
if (nsnull != nextInFlow->mFirstChild) {
nextInFlow->SetFirstContentOffset(nextInFlow->mFirstChild);
}
// Link the frame into our list of children
kidFrame->SetGeometricParent(this);
nsIFrame* kidContentParent;
kidFrame->GetContentParent(kidContentParent);
if (nextInFlow == kidContentParent) {
kidFrame->SetContentParent(this);
}
if (nsnull == prevKidFrame) {
mFirstChild = kidFrame;
SetFirstContentOffset(kidFrame);
} else {
prevKidFrame->SetNextSibling(kidFrame);
}
kidFrame->SetNextSibling(nsnull);
mChildCount++;
// Remember where we just were in case we end up pushing children
prevKidFrame = kidFrame;
prevLastContentIsComplete = mLastContentIsComplete;
// Is the child we just pulled up complete?
mLastContentIsComplete = NS_FRAME_IS_COMPLETE(status);
if (NS_FRAME_IS_NOT_COMPLETE(status)) {
// No the child isn't complete
nsIFrame* kidNextInFlow;
kidFrame->GetNextInFlow(kidNextInFlow);
if (nsnull == kidNextInFlow) {
// The child doesn't have a next-in-flow so create a
// continuing frame. The creation appends it to the flow and
// prepares it for reflow.
nsIFrame* continuingFrame;
nsIStyleContext* kidSC;
kidFrame->GetStyleContext(aPresContext, kidSC);
kidFrame->CreateContinuingFrame(aPresContext, this, kidSC,
continuingFrame);
NS_RELEASE(kidSC);
NS_ASSERTION(nsnull != continuingFrame, "frame creation failed");
// Add the continuing frame to our sibling list and then push
// it to the next-in-flow. This ensures the next-in-flow's
// content offsets and child count are set properly. Note that
// we can safely assume that the continuation is complete so
// we pass PR_TRUE into PushChidren in case our next-in-flow
// was just drained and now needs to know it's
// mLastContentIsComplete state.
kidFrame->SetNextSibling(continuingFrame);
PushChildren(continuingFrame, kidFrame, PR_TRUE);
// After we push the continuation frame we don't need to fuss
// with mLastContentIsComplete beause the continuation frame
// is no longer on *our* list.
}
// If the child isn't complete then it means that we've used up
// all of our available space.
result = PR_FALSE;
break;
}
}
// Update our last content offset
if (nsnull != prevKidFrame) {
NS_ASSERTION(IsLastChild(prevKidFrame), "bad last child");
SetLastContentOffset(prevKidFrame);
}
// We need to make sure the first content offset is correct for any empty
// next-in-flow frames (frames where we pulled up all the child frames)
nextInFlow = (nsTableRowGroupFrame*)mNextInFlow;
if ((nsnull != nextInFlow) && (nsnull == nextInFlow->mFirstChild)) {
// We have at least one empty frame. Did we succesfully pull up all the
// child frames?
if (PR_FALSE == result) {
// No, so we need to adjust the first content offset of all the empty
// frames
AdjustOffsetOfEmptyNextInFlows();
#ifdef NS_DEBUG
} else {
// Yes, we successfully pulled up all the child frames which means all
// the next-in-flows must be empty. Do a sanity check
while (nsnull != nextInFlow) {
NS_ASSERTION(nsnull == nextInFlow->mFirstChild, "non-empty next-in-flow");
nextInFlow->GetNextInFlow((nsIFrame*&)nextInFlow);
}
#endif
}
}
#ifdef NS_DEBUG
VerifyLastIsComplete();
#endif
#ifdef NOISY
ListTag(stdout);
printf(": pullup %sok (childCount=%d) [%d,%d,%c]\n",
(result ? "" : "NOT "),
mChildCount,
mFirstContentOffset, mLastContentOffset,
(mLastContentIsComplete ? 'T' : 'F'));
#ifdef NOISY_FLOW
{
nsTableRowGroupFrame* flow = (nsTableRowGroupFrame*) mNextInFlow;
while (flow != 0) {
printf(" %p: [%d,%d,%c]\n",
flow, flow->mFirstContentOffset, flow->mLastContentOffset,
(flow->mLastContentIsComplete ? 'T' : 'F'));
flow = (nsTableRowGroupFrame*) flow->mNextInFlow;
}
}
#endif
#endif
return result;
}
/**
* Create new frames for content we haven't yet mapped
*
* @param aPresContext presentation context to use
* @param aState current inline state
* @return frComplete if all content has been mapped and frNotComplete
* if we should be continued
*/
nsReflowStatus
nsTableRowGroupFrame::ReflowUnmappedChildren(nsIPresContext* aPresContext,
RowGroupReflowState& aState,
nsSize* aMaxElementSize)
{
#ifdef NS_DEBUG
VerifyLastIsComplete();
#endif
nsIFrame* kidPrevInFlow = nsnull;
nsReflowStatus result = NS_FRAME_NOT_COMPLETE;
// If we have no children and we have a prev-in-flow then we need to pick
// up where it left off. If we have children, e.g. we're being resized, then
// our content offset should already be set correctly...
if ((nsnull == mFirstChild) && (nsnull != mPrevInFlow)) {
nsTableRowGroupFrame* prev = (nsTableRowGroupFrame*)mPrevInFlow;
NS_ASSERTION(prev->mLastContentOffset >= prev->mFirstContentOffset, "bad prevInFlow");
mFirstContentOffset = prev->NextChildOffset();
if (!prev->mLastContentIsComplete) {
// Our prev-in-flow's last child is not complete
prev->LastChild(kidPrevInFlow);
}
}
mLastContentIsComplete = PR_TRUE;
// Place our children, one at a time, until we are out of children
nsSize kidMaxElementSize;
nsSize* pKidMaxElementSize = (nsnull != aMaxElementSize) ? &kidMaxElementSize : nsnull;
PRInt32 kidIndex = NextChildOffset();
nsIFrame* prevKidFrame;
LastChild(prevKidFrame); // XXX remember this...
for (;;) {
// Get the next content object
nsIContentPtr kid = mContent->ChildAt(kidIndex);
if (kid.IsNull()) {
result = NS_FRAME_COMPLETE;
break;
}
// Make sure we still have room left
if (aState.availSize.height <= 0) {
// Note: return status was set to frNotComplete above...
break;
}
// Resolve style
nsIStyleContextPtr kidSC =
aPresContext->ResolveStyleContextFor(kid, this, PR_TRUE);
const nsStyleSpacing* kidSpacing = (const nsStyleSpacing*)
kidSC->GetStyleData(eStyleStruct_Spacing);
nsMargin kidMargin;
kidSpacing->CalcMarginFor(this, kidMargin);
nscoord topMargin = GetTopMarginFor(aPresContext, aState, kidMargin);
nscoord bottomMargin = kidMargin.bottom;
nsIFrame* kidFrame;
// Create a child frame
if (nsnull == kidPrevInFlow) {
nsIContentDelegate* kidDel = nsnull;
kidDel = kid->GetDelegate(aPresContext);
nsresult rv = kidDel->CreateFrame(aPresContext, kid, this, kidSC,
kidFrame);
NS_RELEASE(kidDel);
} else {
kidPrevInFlow->CreateContinuingFrame(aPresContext, this, kidSC,
kidFrame);
}
// Link child frame into the list of children
if (nsnull != prevKidFrame) {
prevKidFrame->SetNextSibling(kidFrame);
} else {
mFirstChild = kidFrame; // our first child
SetFirstContentOffset(kidFrame);
}
mChildCount++;
// Try to reflow the child into the available space. It might not
// fit or might need continuing.
nsReflowMetrics kidSize(pKidMaxElementSize);
kidSize.width=kidSize.height=kidSize.ascent=kidSize.descent=0;
nsReflowState kidReflowState(kidFrame, aState.reflowState, aState.availSize,
eReflowReason_Initial);
kidFrame->WillReflow(*aPresContext);
kidFrame->MoveTo(0, aState.y);
nsReflowStatus status = ReflowChild(kidFrame,aPresContext, kidSize,
kidReflowState);
// Did the child fit?
if ((kidSize.height > aState.availSize.height) && (nsnull != mFirstChild)) {
// The child is too wide to fit in the available space, and it's
// not our first child. Add the frame to our overflow list
NS_ASSERTION(nsnull == mOverflowList, "bad overflow list");
mOverflowList = kidFrame;
prevKidFrame->SetNextSibling(nsnull);
break;
}
// Place the child
//aState.y += topMargin;
nsRect kidRect (0, 0, kidSize.width, kidSize.height);
//kidRect.x += kidMol->margin.left;
kidRect.y += aState.y;
PlaceChild(aPresContext, aState, kidFrame, kidRect, aMaxElementSize, *pKidMaxElementSize);
prevKidFrame = kidFrame;
kidIndex++;
// Did the child complete?
if (NS_FRAME_IS_NOT_COMPLETE(status)) {
// If the child isn't complete then it means that we've used up
// all of our available space
mLastContentIsComplete = PR_FALSE;
break;
}
kidPrevInFlow = nsnull;
}
// Update the content mapping
NS_ASSERTION(IsLastChild(prevKidFrame), "bad last child");
SetLastContentOffset(prevKidFrame);
#ifdef NS_DEBUG
PRInt32 len = LengthOf(mFirstChild);
NS_ASSERTION(len == mChildCount, "bad child count");
#endif
#ifdef NS_DEBUG
VerifyLastIsComplete();
#endif
return result;
}
/**
*/
void nsTableRowGroupFrame::ShrinkWrapChildren(nsIPresContext* aPresContext,
nsReflowMetrics& aDesiredSize)
{
// iterate children and for each row get its height
PRBool atLeastOneRowSpanningCell = PR_FALSE;
nscoord topInnerMargin = 0;
nscoord bottomInnerMargin = 0;
PRInt32 numRows;
ChildCount(numRows);
PRInt32 *rowHeights = new PRInt32[numRows];
nsCRT::memset (rowHeights, 0, numRows*sizeof(PRInt32));
/* Step 1: get the height of the tallest cell in the row and save it for
* pass 2
*/
nsTableRowFrame* rowFrame = (nsTableRowFrame*)mFirstChild;
PRInt32 rowIndex = 0;
while (nsnull != rowFrame)
{
// get the height of the tallest cell in the row (excluding cells that span rows)
nscoord maxCellHeight = rowFrame->GetTallestChild();
nscoord maxCellTopMargin = rowFrame->GetChildMaxTopMargin();
nscoord maxCellBottomMargin = rowFrame->GetChildMaxBottomMargin();
nscoord maxRowHeight = maxCellHeight + maxCellTopMargin + maxCellBottomMargin;
// save the row height for pass 2 below
rowHeights[rowIndex] = maxRowHeight;
// Update top and bottom inner margin if applicable
if (0 == rowIndex) {
topInnerMargin = maxCellTopMargin;
}
if ((rowIndex + 1) == numRows) {
bottomInnerMargin = maxCellBottomMargin;
}
// Get the next row
rowFrame->GetNextSibling((nsIFrame*&)rowFrame);
rowIndex++;
}
/* Step 2: now account for cells that span rows.
* a spanning cell's height is the sum of the heights of the rows it spans,
* or it's own desired height, whichever is greater.
* If the cell's desired height is the larger value, resize the rows and contained
* cells by an equal percentage of the additional space.
*/
/* TODO
* 1. optimization, if (PR_TRUE==atLeastOneRowSpanningCell) ... otherwise skip this step entirely
* 2. find cases where spanning cells effect other spanning cells that began in rows above themselves.
* I think in this case, we have to make another pass through step 2.
* There should be a "rational" check to terminate that kind of loop after n passes, probably 3 or 4.
*/
PRInt32 rowGroupHeight = 0;
rowFrame = (nsTableRowFrame*)mFirstChild;
rowIndex = 0;
while (nsnull != rowFrame)
{
// check this row for a cell with rowspans
nsTableCellFrame* cellFrame;
rowFrame->FirstChild((nsIFrame*&)cellFrame);
while (nsnull != cellFrame)
{
PRInt32 rowSpan = ((nsTableFrame*)mGeometricParent)->GetEffectiveRowSpan(rowIndex,
cellFrame);
if (rowSpan > 1)
{ // found a cell with rowspan > 1, determine its height
nscoord heightOfRowsSpanned = 0;
PRInt32 i;
for ( i = 0; i < rowSpan; i++)
heightOfRowsSpanned += rowHeights[rowIndex + i];
heightOfRowsSpanned -= topInnerMargin + bottomInnerMargin;
/* if the cell height fits in the rows, expand the spanning cell's height and slap it in */
nsSize cellFrameSize;
cellFrame->GetSize(cellFrameSize);
if (heightOfRowsSpanned > cellFrameSize.height)
{
cellFrame->SizeTo(cellFrameSize.width, heightOfRowsSpanned);
// Realign cell content based on new height
cellFrame->VerticallyAlignChild(aPresContext);
}
/* otherwise, distribute the excess height to the rows effected.
* push all subsequent rows down by the total change in height of all the rows above it
*/
else
{
PRInt32 excessHeight = cellFrameSize.height - heightOfRowsSpanned;
PRInt32 excessHeightPerRow = excessHeight/rowSpan;
// for every row starting at the row with the spanning cell...
nsTableRowFrame *rowFrameToBeResized = rowFrame;
for (i = rowIndex; i < numRows; i++)
{
// if the row is within the spanned range, resize the row
if (i < (rowIndex + rowSpan))
{
// update the row height
rowHeights[i] += excessHeightPerRow;
// adjust the height of the row
nsSize rowFrameSize;
rowFrameToBeResized->GetSize(rowFrameSize);
rowFrameToBeResized->SizeTo(rowFrameSize.width, rowHeights[i]);
}
// if we're dealing with a row below the row containing the spanning cell,
// push that row down by the amount we've expanded the cell heights by
if ((i >= rowIndex) && (i != 0))
{
nsRect rowRect;
rowFrameToBeResized->GetRect(rowRect);
nscoord delta = excessHeightPerRow * (i - rowIndex);
if (delta > excessHeight)
delta = excessHeight;
rowFrameToBeResized->MoveTo(rowRect.x, rowRect.y + delta);
}
// Get the next row frame
rowFrameToBeResized->GetNextSibling((nsIFrame*&)rowFrameToBeResized);
}
}
}
// Get the next cell frame
cellFrame->GetNextSibling((nsIFrame*&)cellFrame);
}
// Update the running row group height
rowGroupHeight += rowHeights[rowIndex];
// Get the next row
rowFrame->GetNextSibling((nsIFrame*&)rowFrame);
rowIndex++;
}
// Adjust our desired size
aDesiredSize.height = rowGroupHeight;
// cleanup
delete []rowHeights;
}
nsresult nsTableRowGroupFrame::AdjustSiblingsAfterReflow(nsIPresContext* aPresContext,
RowGroupReflowState& aState,
nsIFrame* aKidFrame,
nscoord aDeltaY)
{
nsIFrame* lastKidFrame = aKidFrame;
if (aDeltaY != 0) {
// Move the frames that follow aKidFrame by aDeltaY
nsIFrame* kidFrame;
aKidFrame->GetNextSibling(kidFrame);
while (nsnull != kidFrame) {
nsPoint origin;
// XXX We can't just slide the child if it has a next-in-flow
kidFrame->GetOrigin(origin);
origin.y += aDeltaY;
// XXX We need to send move notifications to the frame...
kidFrame->WillReflow(*aPresContext);
kidFrame->MoveTo(origin.x, origin.y);
// Get the next frame
lastKidFrame = kidFrame;
kidFrame->GetNextSibling(kidFrame);
}
} else {
// Get the last frame
LastChild(lastKidFrame);
}
// XXX Deal with cells that have rowspans.
// Update our running y-offset to reflect the bottommost child
nsRect rect;
lastKidFrame->GetRect(rect);
aState.y = rect.YMost();
return NS_OK;
}
/** Layout the entire row group.
* This method stacks rows vertically according to HTML 4.0 rules.
* Rows are responsible for layout of their children.
*/
NS_METHOD
nsTableRowGroupFrame::Reflow(nsIPresContext* aPresContext,
nsReflowMetrics& aDesiredSize,
const nsReflowState& aReflowState,
nsReflowStatus& aStatus)
{
if (gsDebug1==PR_TRUE)
printf("nsTableRowGroupFrame::Reflow - aMaxSize = %d, %d\n",
aReflowState.maxSize.width, aReflowState.maxSize.height);
#ifdef NS_DEBUG
PreReflowCheck();
#endif
// Initialize out parameter
if (nsnull != aDesiredSize.maxElementSize) {
aDesiredSize.maxElementSize->width = 0;
aDesiredSize.maxElementSize->height = 0;
}
RowGroupReflowState state(aPresContext, aReflowState);
if (eReflowReason_Incremental == aReflowState.reason) {
nsIFrame* target;
aReflowState.reflowCommand->GetTarget(target);
if (this == target) {
NS_NOTYETIMPLEMENTED("unexpected reflow command");
}
// XXX Recover state
// XXX Deal with the case where the reflow command is targeted at us
nsIFrame* kidFrame;
aReflowState.reflowCommand->GetNext(kidFrame);
// Remember the old rect
nsRect oldKidRect;
kidFrame->GetRect(oldKidRect);
// Pass along the reflow command
// XXX Correctly compute the available space...
nsReflowState kidReflowState(kidFrame, aReflowState, aReflowState.maxSize);
nsReflowMetrics desiredSize(nsnull);
kidFrame->WillReflow(*aPresContext);
aStatus = ReflowChild(kidFrame, aPresContext, desiredSize, kidReflowState);
// Resize the row frame
nsRect kidRect;
kidFrame->GetRect(kidRect);
kidFrame->SizeTo(desiredSize.width, desiredSize.height);
// Adjust the frames that follow...
AdjustSiblingsAfterReflow(aPresContext, state, kidFrame, desiredSize.height -
oldKidRect.height);
// Return of desired size
aDesiredSize.width = aReflowState.maxSize.width;
aDesiredSize.height = state.y;
} else {
PRBool reflowMappedOK = PR_TRUE;
aStatus = NS_FRAME_COMPLETE;
// Check for an overflow list
MoveOverflowToChildList();
// Reflow the existing frames
if (nsnull != mFirstChild) {
reflowMappedOK = ReflowMappedChildren(aPresContext, state, aDesiredSize.maxElementSize);
if (PR_FALSE == reflowMappedOK) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
}
// Did we successfully reflow our mapped children?
if (PR_TRUE == reflowMappedOK) {
// Any space left?
if (state.availSize.height <= 0) {
// No space left. Don't try to pull-up children or reflow unmapped
if (NextChildOffset() < mContent->ChildCount()) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
} else if (NextChildOffset() < mContent->ChildCount()) {
// Try and pull-up some children from a next-in-flow
if (PullUpChildren(aPresContext, state, aDesiredSize.maxElementSize)) {
// If we still have unmapped children then create some new frames
if (NextChildOffset() < mContent->ChildCount()) {
aStatus = ReflowUnmappedChildren(aPresContext, state, aDesiredSize.maxElementSize);
}
} else {
// We were unable to pull-up all the existing frames from the
// next in flow
aStatus = NS_FRAME_NOT_COMPLETE;
}
}
}
if (NS_FRAME_IS_COMPLETE(aStatus)) {
// Don't forget to add in the bottom margin from our last child.
// Only add it in if there's room for it.
nscoord margin = state.prevMaxPosBottomMargin -
state.prevMaxNegBottomMargin;
if (state.availSize.height >= margin) {
state.y += margin;
}
}
// Return our desired rect
//NS_ASSERTION(0<state.firstRowHeight, "illegal firstRowHeight after reflow");
//NS_ASSERTION(0<state.y, "illegal height after reflow");
aDesiredSize.width = aReflowState.maxSize.width;
aDesiredSize.height = state.y;
// shrink wrap rows to height of tallest cell in that row
ShrinkWrapChildren(aPresContext, aDesiredSize);
}
#ifdef NS_DEBUG
PostReflowCheck(aStatus);
#endif
if (gsDebug1==PR_TRUE)
{
if (nsnull!=aDesiredSize.maxElementSize)
printf("nsTableRowGroupFrame::RR returning: %s with aDesiredSize=%d,%d, aMES=%d,%d\n",
NS_FRAME_IS_COMPLETE(aStatus)?"Complete":"Not Complete",
aDesiredSize.width, aDesiredSize.height,
aDesiredSize.maxElementSize->width, aDesiredSize.maxElementSize->height);
else
printf("nsTableRowGroupFrame::RR returning: %s with aDesiredSize=%d,%d, aMES=NSNULL\n",
NS_FRAME_IS_COMPLETE(aStatus)?"Complete":"Not Complete",
aDesiredSize.width, aDesiredSize.height);
}
return NS_OK;
}
NS_METHOD
nsTableRowGroupFrame::CreateContinuingFrame(nsIPresContext* aPresContext,
nsIFrame* aParent,
nsIStyleContext* aStyleContext,
nsIFrame*& aContinuingFrame)
{
nsTableRowGroupFrame* cf = new nsTableRowGroupFrame(mContent, aParent);
if (nsnull == cf) {
return NS_ERROR_OUT_OF_MEMORY;
}
PrepareContinuingFrame(aPresContext, aParent, aStyleContext, cf);
if (PR_TRUE==gsDebug1) printf("nsTableRowGroupFrame::CCF parent = %p, this=%p, cf=%p\n", aParent, this, cf);
aContinuingFrame = cf;
return NS_OK;
}
/* ----- static methods ----- */
nsresult nsTableRowGroupFrame::NewFrame(nsIFrame** aInstancePtrResult,
nsIContent* aContent,
nsIFrame* aParent)
{
NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
if (nsnull == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
nsIFrame* it = new nsTableRowGroupFrame(aContent, aParent);
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aInstancePtrResult = it;
return NS_OK;
}
// For Debugging ONLY
NS_METHOD nsTableRowGroupFrame::MoveTo(nscoord aX, nscoord aY)
{
if ((aX != mRect.x) || (aY != mRect.y)) {
mRect.x = aX;
mRect.y = aY;
nsIView* view;
GetView(view);
// Let the view know
if (nsnull != view) {
// Position view relative to it's parent, not relative to our
// parent frame (our parent frame may not have a view).
nsIView* parentWithView;
nsPoint origin;
GetOffsetFromView(origin, parentWithView);
view->SetPosition(origin.x, origin.y);
NS_IF_RELEASE(parentWithView);
}
}
return NS_OK;
}
NS_METHOD nsTableRowGroupFrame::SizeTo(nscoord aWidth, nscoord aHeight)
{
mRect.width = aWidth;
mRect.height = aHeight;
nsIView* view;
GetView(view);
// Let the view know
if (nsnull != view) {
view->SetDimensions(aWidth, aHeight);
}
return NS_OK;
}
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