/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ // vim:cindent:ts=2:et:sw=2: /* ***** BEGIN LICENSE BLOCK ***** * Version: NPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Netscape 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/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 the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * David Baron * * Alternatively, the contents of this file may be used under the terms of * either 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 NPL, 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 NPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "nsBlockReflowContext.h" #include "nsLineLayout.h" #include "nsSpaceManager.h" #include "nsIFontMetrics.h" #include "nsIPresContext.h" #include "nsIContent.h" #include "nsIStyleContext.h" #include "nsHTMLReflowCommand.h" #include "nsHTMLContainerFrame.h" #include "nsBlockFrame.h" #include "nsIDOMHTMLTableCellElement.h" #include "nsIDOMHTMLBodyElement.h" #include "nsLayoutAtoms.h" #include "nsCOMPtr.h" #ifdef NS_DEBUG #undef NOISY_MAX_ELEMENT_SIZE #undef REALLY_NOISY_MAX_ELEMENT_SIZE #undef NOISY_VERTICAL_MARGINS #else #undef NOISY_MAX_ELEMENT_SIZE #undef REALLY_NOISY_MAX_ELEMENT_SIZE #undef NOISY_VERTICAL_MARGINS #endif nsBlockReflowContext::nsBlockReflowContext(nsIPresContext* aPresContext, const nsHTMLReflowState& aParentRS, PRBool aComputeMaxElementSize, PRBool aComputeMaximumWidth) : mPresContext(aPresContext), mOuterReflowState(aParentRS), mMetrics(aComputeMaxElementSize ? &mMaxElementSize : nsnull), mMaxElementSize(0, 0), mIsTable(PR_FALSE), mComputeMaximumWidth(aComputeMaximumWidth), mBlockShouldInvalidateItself(PR_FALSE) { mStyleBorder = nsnull; mStyleMargin = nsnull; mStylePadding = nsnull; if (mComputeMaximumWidth) mMetrics.mFlags |= NS_REFLOW_CALC_MAX_WIDTH; } void nsBlockReflowContext::ComputeCollapsedTopMargin(nsIPresContext* aPresContext, nsHTMLReflowState& aRS, /* inout */ nsCollapsingMargin& aMargin) { // Get aFrame's top margin aMargin.Include(aRS.mComputedMargin.top); #ifdef NOISY_VERTICAL_MARGINS nsFrame::ListTag(stdout, aRS.frame); printf(": %d => %d\n", aRS.mComputedMargin.top, aMargin.get()); #endif // Calculate aFrame's generational top-margin from its child // blocks. Note that if aFrame has a non-zero top-border or // top-padding then this step is skipped because it will be a margin // root. It is also skipped if the frame is a margin root for other // reasons. if (0 == aRS.mComputedBorderPadding.top) { nsFrameState state; aRS.frame->GetFrameState(&state); if (!(state & NS_BLOCK_MARGIN_ROOT)) { nsBlockFrame* bf; if (NS_SUCCEEDED(aRS.frame->QueryInterface(kBlockFrameCID, NS_REINTERPRET_CAST(void**, &bf)))) { // Ask the block frame for the top block child that we should // try to collapse the top margin with. // XXX If the block is empty, we need to check its bottom margin // and its sibling's top margin (etc.) too! See XXXldb comment about // emptyness below in PlaceBlock. nsIFrame* childFrame = bf->GetTopBlockChild(); if (nsnull != childFrame) { // Here is where we recur. Now that we have determined that a // generational collapse is required we need to compute the // child blocks margin and so in so that we can look into // it. For its margins to be computed we need to have a reflow // state for it. Since the reflow reason is irrelevant, we'll // arbitrarily make it a `resize' to avoid the path-plucking // behavior if we're in an incremental reflow. nsSize availSpace(aRS.mComputedWidth, aRS.mComputedHeight); nsHTMLReflowState reflowState(aPresContext, aRS, childFrame, availSpace, eReflowReason_Resize); ComputeCollapsedTopMargin(aPresContext, reflowState, aMargin); } } } } #ifdef NOISY_VERTICAL_MARGINS nsFrame::ListTag(stdout, aRS.frame); printf(": => %d\n", aMargin.get()); #endif } struct nsBlockHorizontalAlign { nscoord mXOffset; // left edge nscoord mLeftMargin; nscoord mRightMargin; }; // Given the width of the block frame and a suggested x-offset calculate // the actual x-offset taking into account horizontal alignment. Also returns // the actual left and right margin void nsBlockReflowContext::AlignBlockHorizontally(nscoord aWidth, nsBlockHorizontalAlign &aAlign) { // Initialize OUT parameters aAlign.mLeftMargin = mMargin.left; aAlign.mRightMargin = mMargin.right; // Get style unit associated with the left and right margins nsStyleUnit leftUnit = mStyleMargin->mMargin.GetLeftUnit(); if (eStyleUnit_Inherit == leftUnit) { leftUnit = GetRealMarginLeftUnit(); } nsStyleUnit rightUnit = mStyleMargin->mMargin.GetRightUnit(); if (eStyleUnit_Inherit == rightUnit) { rightUnit = GetRealMarginRightUnit(); } // Apply post-reflow horizontal alignment. When a block element // doesn't use it all of the available width then we need to // align it using the text-align property. if (NS_UNCONSTRAINEDSIZE != mSpace.width) { // It is possible that the object reflowed was given a // constrained width and ended up picking a different width // (e.g. a table width a set width that ended up larger // because its contents required it). When this happens we // need to recompute auto margins because the reflow state's // computations are no longer valid. if (aWidth != mComputedWidth) { if (eStyleUnit_Auto == leftUnit) { aAlign.mXOffset = mSpace.x; aAlign.mLeftMargin = 0; } if (eStyleUnit_Auto == rightUnit) { aAlign.mRightMargin = 0; } } // Compute how much remaining space there is, and in special // cases apply it (normally we should get zero here because of // the logic in nsHTMLReflowState). nscoord remainingSpace = mSpace.XMost() - (aAlign.mXOffset + aWidth + aAlign.mRightMargin); if (remainingSpace > 0) { // The block/table frame didn't use all of the available // space. Synthesize margins for its horizontal placement. if (eStyleUnit_Auto == leftUnit) { if (eStyleUnit_Auto == rightUnit) { // When both margins are auto, we center the block aAlign.mXOffset += remainingSpace / 2; } else { // When the left margin is auto we right align the block aAlign.mXOffset += remainingSpace; } } else if (eStyleUnit_Auto != rightUnit) { // The block/table doesn't have auto margins. // For normal (non-table) blocks we don't get here because // nsHTMLReflowState::CalculateBlockSideMargins handles this. // (I think there may be an exception to that, though...) // We use a special value of the text-align property for // HTML alignment (the CENTER element and DIV ALIGN=...) // since it acts on blocks and tables rather than just // being a text-align. // So, check the text-align value from the parent to see if // it has one of these special values. const nsStyleText* styleText = mOuterReflowState.mStyleText; if (styleText->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_RIGHT) { aAlign.mXOffset += remainingSpace; } else if (styleText->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_CENTER) { aAlign.mXOffset += remainingSpace / 2; } else { // If we don't have a special text-align value indicating // HTML alignment, then use the CSS rules. // When neither margin is auto then the block is said to // be over constrained, Depending on the direction, choose // which margin to treat as auto. PRUint8 direction = mOuterReflowState.mStyleVisibility->mDirection; if (NS_STYLE_DIRECTION_RTL == direction) { // The left margin becomes auto aAlign.mXOffset += remainingSpace; } //else { // The right margin becomes auto which is a no-op //} } } } } } static void ComputeShrinkwrapMargins(const nsStyleMargin* aStyleMargin, nscoord aWidth, nsMargin& aMargin, nscoord& aXToUpdate) { nscoord boxWidth = aWidth; float leftPct = 0.0; float rightPct = 0.0; if (eStyleUnit_Percent == aStyleMargin->mMargin.GetLeftUnit()) { nsStyleCoord leftCoord; aStyleMargin->mMargin.GetLeft(leftCoord); leftPct = leftCoord.GetPercentValue(); } else { boxWidth += aMargin.left; } if (eStyleUnit_Percent == aStyleMargin->mMargin.GetRightUnit()) { nsStyleCoord rightCoord; aStyleMargin->mMargin.GetRight(rightCoord); rightPct = rightCoord.GetPercentValue(); } else { boxWidth += aMargin.right; } // The total shrink wrap width "sww" is calculated by the expression: // sww = bw + (mp * sww) // where "bw" is the box width (frame width plus margins that aren't percentage // based) and "mp" are the total margin percentages (i.e., the left percentage // value plus the right percentage value) // Solving for "sww" gives us: // sww = bw / (1 - mp) // Note that this is only well defined for "mp" less than 100% // XXXldb Um... percentage margins are based on the containing block width. float marginPct = leftPct + rightPct; if (marginPct >= 1.0) { // Ignore the right percentage and just use the left percentage // XXX Pay attention to direction property... marginPct = leftPct; rightPct = 0.0; } if ((marginPct > 0.0) && (marginPct < 1.0)) { double shrinkWrapWidth = float(boxWidth) / (1.0 - marginPct); if (eStyleUnit_Percent == aStyleMargin->mMargin.GetLeftUnit()) { aMargin.left = NSToCoordFloor((float)(shrinkWrapWidth * leftPct)); aXToUpdate += aMargin.left; } if (eStyleUnit_Percent == aStyleMargin->mMargin.GetRightUnit()) { aMargin.right = NSToCoordFloor((float)(shrinkWrapWidth * rightPct)); } } } nsresult nsBlockReflowContext::ReflowBlock(const nsRect& aSpace, PRBool aApplyTopMargin, nsCollapsingMargin& aPrevBottomMargin, PRBool aIsAdjacentWithTop, nsMargin& aComputedOffsets, nsHTMLReflowState& aFrameRS, nsReflowStatus& aFrameReflowStatus) { nsresult rv = NS_OK; mFrame = aFrameRS.frame; mSpace = aSpace; // Get reflow reason set correctly. It's possible that a child was // created and then it was decided that it could not be reflowed // (for example, a block frame that isn't at the start of a // line). In this case the reason will be wrong so we need to check // the frame state. aFrameRS.reason = eReflowReason_Resize; nsFrameState state; mFrame->GetFrameState(&state); if (NS_FRAME_FIRST_REFLOW & state) { aFrameRS.reason = eReflowReason_Initial; } else if (mOuterReflowState.reason == eReflowReason_Incremental) { // If the frame we're about to reflow is on the reflow path, then // propagate the reflow as `incremental' so it unwinds correctly // to the target frames below us. PRBool frameIsOnReflowPath = mOuterReflowState.path->HasChild(mFrame); if (frameIsOnReflowPath) aFrameRS.reason = eReflowReason_Incremental; // But...if the incremental reflow command is a StyleChanged // reflow and its target is the current block, change the reason // to `style change', so that it propagates through the entire // subtree. nsHTMLReflowCommand* rc = mOuterReflowState.path->mReflowCommand; if (rc) { nsReflowType type; rc->GetType(type); if (type == eReflowType_StyleChanged) aFrameRS.reason = eReflowReason_StyleChange; else if (type == eReflowType_ReflowDirty && (state & NS_FRAME_IS_DIRTY) && !frameIsOnReflowPath) { aFrameRS.reason = eReflowReason_Dirty; } } } else if (mOuterReflowState.reason == eReflowReason_StyleChange) { aFrameRS.reason = eReflowReason_StyleChange; } else if (mOuterReflowState.reason == eReflowReason_Dirty) { if (state & NS_FRAME_IS_DIRTY) aFrameRS.reason = eReflowReason_Dirty; } /* We build a different reflow context based on the width attribute of the block, * if it's a floater. * Auto-width floaters need to have their containing-block size set explicitly, * factoring in other floaters that impact it. * It's possible this should be quirks-only. * All other blocks proceed normally. */ // XXXldb We should really fix this in nsHTMLReflowState::InitConstraints instead. const nsStylePosition* position; mFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)position); nsStyleUnit widthUnit = position->mWidth.GetUnit(); const nsStyleDisplay* display; mFrame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)display); if ((eStyleUnit_Auto == widthUnit) && ((NS_STYLE_FLOAT_LEFT == display->mFloats) || (NS_STYLE_FLOAT_RIGHT == display->mFloats))) { // Initialize the reflow state and constrain the containing block's // width and height to the available width and height. aFrameRS.Init(mPresContext, mSpace.width, mSpace.height); } else { // Initialize the reflow state and use the containing block's computed // width and height (or derive appropriate values for an // absolutely positioned frame). aFrameRS.Init(mPresContext); } aComputedOffsets = aFrameRS.mComputedOffsets; aFrameRS.mLineLayout = nsnull; if (!aIsAdjacentWithTop) { aFrameRS.mFlags.mIsTopOfPage = PR_FALSE; // make sure this is cleared } mIsTable = NS_STYLE_DISPLAY_TABLE == aFrameRS.mStyleDisplay->mDisplay; mComputedWidth = aFrameRS.mComputedWidth; if (aApplyTopMargin) { // Compute the childs collapsed top margin (its margin collpased // with its first childs top-margin -- recursively). ComputeCollapsedTopMargin(mPresContext, aFrameRS, aPrevBottomMargin); #ifdef NOISY_VERTICAL_MARGINS nsFrame::ListTag(stdout, mOuterReflowState.frame); printf(": reflowing "); nsFrame::ListTag(stdout, mFrame); printf(" margin => %d\n", aPrevBottomMargin.get()); #endif // Adjust the available height if its constrained so that the // child frame doesn't think it can reflow into its margin area. if (NS_UNCONSTRAINEDSIZE != aFrameRS.availableHeight) { aFrameRS.availableHeight -= aPrevBottomMargin.get(); } } mTopMargin = aPrevBottomMargin.get(); // Compute x/y coordinate where reflow will begin. Use the rules // from 10.3.3 to determine what to apply. At this point in the // reflow auto left/right margins will have a zero value. mMargin = aFrameRS.mComputedMargin; mStyleBorder = aFrameRS.mStyleBorder; mStyleMargin = aFrameRS.mStyleMargin; mStylePadding = aFrameRS.mStylePadding; nscoord x; nscoord y = mSpace.y + mTopMargin; // If it's a right floated element, then calculate the x-offset // differently if (NS_STYLE_FLOAT_RIGHT == aFrameRS.mStyleDisplay->mFloats) { nscoord frameWidth; if (NS_UNCONSTRAINEDSIZE == aFrameRS.mComputedWidth) { nsSize frameSize; // Use the current frame width mFrame->GetSize(frameSize); frameWidth = frameSize.width; } else { frameWidth = aFrameRS.mComputedWidth + aFrameRS.mComputedBorderPadding.left + aFrameRS.mComputedBorderPadding.right; } // if this is an unconstrained width reflow, then just place the floater at the left margin if (NS_UNCONSTRAINEDSIZE == mSpace.width) x = mSpace.x; else x = mSpace.XMost() - mMargin.right - frameWidth; } else { x = mSpace.x + mMargin.left; } mX = x; mY = y; // If it's an auto-width table, then it doesn't behave like other blocks // XXX why not for a floating table too? if (mIsTable && !aFrameRS.mStyleDisplay->IsFloating()) { // If this isn't the table's initial reflow, then use its existing // width to determine where it will be placed horizontally if (aFrameRS.reason != eReflowReason_Initial) { nsBlockHorizontalAlign align; nsSize size; mFrame->GetSize(size); align.mXOffset = x; AlignBlockHorizontally(size.width, align); // Don't reset "mX". because PlaceBlock() will recompute the // x-offset and expects "mX" to be at the left margin edge x = align.mXOffset; } } // If the element is relatively positioned, then adjust x and y accordingly if (NS_STYLE_POSITION_RELATIVE == aFrameRS.mStyleDisplay->mPosition) { x += aFrameRS.mComputedOffsets.left; y += aFrameRS.mComputedOffsets.top; } // Let frame know that we are reflowing it mFrame->WillReflow(mPresContext); // Position it and its view (if it has one) // Note: Use "x" and "y" and not "mX" and "mY" because they more accurately // represents where we think the block will be placed mFrame->MoveTo(mPresContext, x, y); nsContainerFrame::PositionFrameView(mPresContext, mFrame); #ifdef DEBUG mMetrics.width = nscoord(0xdeadbeef); mMetrics.height = nscoord(0xdeadbeef); mMetrics.ascent = nscoord(0xdeadbeef); mMetrics.descent = nscoord(0xdeadbeef); if (nsnull != mMetrics.maxElementSize) { mMetrics.maxElementSize->width = nscoord(0xdeadbeef); mMetrics.maxElementSize->height = nscoord(0xdeadbeef); } #endif // Adjust spacemanager coordinate system for the frame. The // spacemanager coordinates are inside the callers // border+padding, but the x/y coordinates are not (recall that // frame coordinates are relative to the parents origin and that the // parents border/padding is inside the parent // frame. Therefore we have to subtract out the parents // border+padding before translating. nscoord tx = x - mOuterReflowState.mComputedBorderPadding.left; nscoord ty = y - mOuterReflowState.mComputedBorderPadding.top; mOuterReflowState.mSpaceManager->Translate(tx, ty); // See if this is the child's initial reflow and we are supposed to // compute our maximum width if (mComputeMaximumWidth && (eReflowReason_Initial == aFrameRS.reason)) { mOuterReflowState.mSpaceManager->PushState(); nscoord oldAvailableWidth = aFrameRS.availableWidth; nscoord oldComputedWidth = aFrameRS.mComputedWidth; aFrameRS.availableWidth = NS_UNCONSTRAINEDSIZE; aFrameRS.mComputedWidth = NS_UNCONSTRAINEDSIZE; rv = mFrame->Reflow(mPresContext, mMetrics, aFrameRS, aFrameReflowStatus); // Update the reflow metrics with the maximum width mMetrics.mMaximumWidth = mMetrics.width; #ifdef NOISY_REFLOW printf("*** nsBlockReflowContext::ReflowBlock block %p returning max width %d\n", mFrame, mMetrics.mMaximumWidth); #endif // The second reflow is just as a resize reflow with the constrained // width aFrameRS.availableWidth = oldAvailableWidth; aFrameRS.mComputedWidth = oldComputedWidth; aFrameRS.reason = eReflowReason_Resize; mOuterReflowState.mSpaceManager->PopState(); } rv = mFrame->Reflow(mPresContext, mMetrics, aFrameRS, aFrameReflowStatus); mOuterReflowState.mSpaceManager->Translate(-tx, -ty); #ifdef DEBUG if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) { if (CRAZY_WIDTH(mMetrics.width) || CRAZY_HEIGHT(mMetrics.height)) { printf("nsBlockReflowContext: "); nsFrame::ListTag(stdout, mFrame); printf(" metrics=%d,%d!\n", mMetrics.width, mMetrics.height); } if ((nsnull != mMetrics.maxElementSize) && ((nscoord(0xdeadbeef) == mMetrics.maxElementSize->width) || (nscoord(0xdeadbeef) == mMetrics.maxElementSize->height))) { printf("nsBlockReflowContext: "); nsFrame::ListTag(stdout, mFrame); printf(" didn't set max-element-size!\n"); mMetrics.maxElementSize->width = 0; mMetrics.maxElementSize->height = 0; } #ifdef REALLY_NOISY_MAX_ELEMENT_SIZE // Note: there are common reflow situations where this *correctly* // occurs; so only enable this debug noise when you really need to // analyze in detail. if ((nsnull != mMetrics.maxElementSize) && ((mMetrics.maxElementSize->width > mMetrics.width) || (mMetrics.maxElementSize->height > mMetrics.height))) { printf("nsBlockReflowContext: "); nsFrame::ListTag(stdout, mFrame); printf(": WARNING: maxElementSize=%d,%d > metrics=%d,%d\n", mMetrics.maxElementSize->width, mMetrics.maxElementSize->height, mMetrics.width, mMetrics.height); } #endif if ((mMetrics.width == nscoord(0xdeadbeef)) || (mMetrics.height == nscoord(0xdeadbeef)) || (mMetrics.ascent == nscoord(0xdeadbeef)) || (mMetrics.descent == nscoord(0xdeadbeef))) { printf("nsBlockReflowContext: "); nsFrame::ListTag(stdout, mFrame); printf(" didn't set whad %d,%d,%d,%d!\n", mMetrics.width, mMetrics.height, mMetrics.ascent, mMetrics.descent); } } #endif #ifdef DEBUG if (nsBlockFrame::gNoisyMaxElementSize) { nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent); if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) { if (nsnull != mMetrics.maxElementSize) { printf(" "); nsFrame::ListTag(stdout, mFrame); printf(": maxElementSize=%d,%d wh=%d,%d\n", mMetrics.maxElementSize->width, mMetrics.maxElementSize->height, mMetrics.width, mMetrics.height); } } } #endif mFrame->GetFrameState(&state); if (0 == (NS_FRAME_OUTSIDE_CHILDREN & state)) { // Provide overflow area for child that doesn't have any mMetrics.mOverflowArea.x = 0; mMetrics.mOverflowArea.y = 0; mMetrics.mOverflowArea.width = mMetrics.width; mMetrics.mOverflowArea.height = mMetrics.height; } // Now that frame has been reflowed at least one time make sure that // the NS_FRAME_FIRST_REFLOW bit is cleared so that never give it an // initial reflow reason again. if (eReflowReason_Initial == aFrameRS.reason) { mFrame->SetFrameState(state & ~NS_FRAME_FIRST_REFLOW); } if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus) || (state & NS_FRAME_OUT_OF_FLOW)) { // If frame is complete and has a next-in-flow, we need to delete // them now. Do not do this when a break-before is signaled because // the frame is going to get reflowed again (and may end up wanting // a next-in-flow where it ends up), unless it is an out of flow frame. if (NS_FRAME_IS_COMPLETE(aFrameReflowStatus)) { nsIFrame* kidNextInFlow; mFrame->GetNextInFlow(&kidNextInFlow); if (nsnull != kidNextInFlow) { // Remove all of the childs next-in-flows. Make sure that we ask // the right parent to do the removal (it's possible that the // parent is not this because we are executing pullup code) /* XXX promote DeleteChildsNextInFlow to nsIFrame to elminate this cast */ nsHTMLContainerFrame* parent; mFrame->GetParent((nsIFrame**)&parent); parent->DeleteChildsNextInFlow(mPresContext, mFrame); } } } // If the block is shrink wrapping its width, then see if we have percentage // based margins. If so, we can calculate them now that we know the shrink // wrap width if (NS_SHRINKWRAPWIDTH == aFrameRS.mComputedWidth) { ComputeShrinkwrapMargins(aFrameRS.mStyleMargin, mMetrics.width, mMargin, mX); } return rv; } /** * Attempt to place the block frame within the available space. If * it fits, apply horizontal positioning (CSS 10.3.3), collapse * margins (CSS2 8.3.1). Also apply relative positioning. */ PRBool nsBlockReflowContext::PlaceBlock(const nsHTMLReflowState& aReflowState, PRBool aForceFit, const nsMargin& aComputedOffsets, nsCollapsingMargin& aBottomMarginResult, nsRect& aInFlowBounds, nsRect& aCombinedRect) { // Compute collapsed bottom margin value aBottomMarginResult = mMetrics.mCarriedOutBottomMargin; aBottomMarginResult.Include(mMargin.bottom); // See if the block will fit in the available space PRBool fits = PR_TRUE; nscoord x = mX; nscoord y = mY; // When deciding whether it's empty we also need to take into // account the overflow area // XXXldb What should really matter is whether there exist non- // empty frames in the block (with appropriate whitespace munging). // Consider the case where we clip off the overflow with // 'overflow: hidden' (which doesn't currently affect mOverflowArea, // but probably should. if ((0 == mMetrics.height) && (0 == mMetrics.mOverflowArea.height)) { // Collapse the bottom margin with the top margin that was already // applied. aBottomMarginResult.Include(mTopMargin); #ifdef NOISY_VERTICAL_MARGINS printf(" "); nsFrame::ListTag(stdout, mOuterReflowState.frame); printf(": "); nsFrame::ListTag(stdout, mFrame); printf(" -- collapsing top & bottom margin together; y=%d spaceY=%d\n", y, mSpace.y); #endif y = mSpace.y; // Empty blocks do not have anything special done to them and they // always fit. Note: don't force the width to 0 nsRect r(x, y, mMetrics.width, 0); // Now place the frame and complete the reflow process nsContainerFrame::FinishReflowChild(mFrame, mPresContext, &aReflowState, mMetrics, x, y, 0); aInFlowBounds = r; // Retain combined area information in case we contain a floater // and nothing else. aCombinedRect = mMetrics.mOverflowArea; aCombinedRect.x += x; aCombinedRect.y += y; } else { // See if the frame fit. If its the first frame then it always // fits. if (aForceFit || (y + mMetrics.height <= mSpace.YMost())) { // Calculate the actual x-offset and left and right margin nsBlockHorizontalAlign align; align.mXOffset = x; AlignBlockHorizontally(mMetrics.width, align); x = align.mXOffset; mMargin.left = align.mLeftMargin; mMargin.right = align.mRightMargin; // Update the in-flow bounds rectangle aInFlowBounds.SetRect(x, y, mMetrics.width, mMetrics.height); // Compute combined-rect in callers coordinate system. The value // returned in the reflow metrics is relative to the child // frame. aCombinedRect.x = mMetrics.mOverflowArea.x + x; aCombinedRect.y = mMetrics.mOverflowArea.y + y; aCombinedRect.width = mMetrics.mOverflowArea.width; aCombinedRect.height = mMetrics.mOverflowArea.height; // Apply CSS relative positioning to update x,y coordinates // Note that this must be done after changing aCombinedRect // since relatively positioned elements should act as if they // were at their original position. const nsStyleDisplay* styleDisp; mFrame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)styleDisp); if (NS_STYLE_POSITION_RELATIVE == styleDisp->mPosition) { x += aComputedOffsets.left; y += aComputedOffsets.top; } // Now place the frame and complete the reflow process nsContainerFrame::FinishReflowChild(mFrame, mPresContext, &aReflowState, mMetrics, x, y, 0); // Adjust the max-element-size in the metrics to take into // account the margins around the block element. Note that we // use the collapsed top and bottom margin values. if (nsnull != mMetrics.maxElementSize) { nsSize* m = mMetrics.maxElementSize; nsMargin maxElemMargin = mMargin; if (NS_SHRINKWRAPWIDTH == mComputedWidth) { nscoord dummyXOffset; // Base the margins on the max-element size ComputeShrinkwrapMargins(mStyleMargin, m->width, maxElemMargin, dummyXOffset); } // Do not allow auto margins to impact the max-element size // since they are springy and don't really count! if ((eStyleUnit_Auto != mStyleMargin->mMargin.GetLeftUnit()) && (eStyleUnit_Null != mStyleMargin->mMargin.GetLeftUnit())) { m->width += maxElemMargin.left; } if ((eStyleUnit_Auto != mStyleMargin->mMargin.GetRightUnit()) && (eStyleUnit_Null != mStyleMargin->mMargin.GetRightUnit())) { m->width += maxElemMargin.right; } #if 0 // XXX_fix_me // Margin height should affect the max-element height (since // auto top/bottom margins are always zero) // XXXldb Should it? m->height += mTopMargin + mBottomMargin; #endif } } else { // Send the DidReflow() notification, but don't bother placing // the frame mFrame->DidReflow(mPresContext, &aReflowState, NS_FRAME_REFLOW_FINISHED); fits = PR_FALSE; } } return fits; } // If we have an inherited margin its possible that its auto all the // way up to the top of the tree. If that is the case, we need to know // it. nsStyleUnit nsBlockReflowContext::GetRealMarginLeftUnit() { nsStyleUnit unit = eStyleUnit_Inherit; nsIStyleContext* sc; mFrame->GetStyleContext(&sc); while ((nsnull != sc) && (eStyleUnit_Inherit == unit)) { // Get parent style context nsIStyleContext* psc; psc = sc->GetParent(); NS_RELEASE(sc); sc = psc; if (nsnull != sc) { const nsStyleMargin* margin = (const nsStyleMargin*) sc->GetStyleData(eStyleStruct_Margin); unit = margin->mMargin.GetLeftUnit(); } } NS_IF_RELEASE(sc); return unit; } // If we have an inherited margin its possible that its auto all the // way up to the top of the tree. If that is the case, we need to know // it. nsStyleUnit nsBlockReflowContext::GetRealMarginRightUnit() { nsStyleUnit unit = eStyleUnit_Inherit; nsIStyleContext* sc; mFrame->GetStyleContext(&sc); while ((nsnull != sc) && (eStyleUnit_Inherit == unit)) { // Get parent style context nsIStyleContext* psc; psc = sc->GetParent(); NS_RELEASE(sc); sc = psc; if (nsnull != sc) { const nsStyleMargin* margin = (const nsStyleMargin*) sc->GetStyleData(eStyleStruct_Margin); unit = margin->mMargin.GetRightUnit(); } } NS_IF_RELEASE(sc); return unit; }