mirror of
https://github.com/mozilla/gecko-dev.git
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972 lines
36 KiB
C++
972 lines
36 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* state used in reflow of block frames */
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#include "nsBlockReflowContext.h"
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#include "nsBlockReflowState.h"
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#include "nsBlockFrame.h"
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#include "nsLineLayout.h"
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#include "nsPresContext.h"
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#include "nsGkAtoms.h"
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#include "nsIFrame.h"
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#include "nsFrameManager.h"
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#include "mozilla/AutoRestore.h"
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#include "FrameLayerBuilder.h"
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#include "nsINameSpaceManager.h"
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#include "mozilla/Util.h" // for DebugOnly
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#ifdef DEBUG
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#include "nsBlockDebugFlags.h"
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#endif
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using namespace mozilla;
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using namespace mozilla::layout;
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nsBlockReflowState::nsBlockReflowState(const nsHTMLReflowState& aReflowState,
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nsPresContext* aPresContext,
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nsBlockFrame* aFrame,
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const nsHTMLReflowMetrics& aMetrics,
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bool aTopMarginRoot,
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bool aBottomMarginRoot,
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bool aBlockNeedsFloatManager)
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: mBlock(aFrame),
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mPresContext(aPresContext),
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mReflowState(aReflowState),
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mPushedFloats(nsnull),
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mOverflowTracker(nsnull),
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mPrevBottomMargin(),
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mLineNumber(0),
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mFlags(0),
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mFloatBreakType(NS_STYLE_CLEAR_NONE)
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{
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SetFlag(BRS_ISFIRSTINFLOW, aFrame->GetPrevInFlow() == nsnull);
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SetFlag(BRS_ISOVERFLOWCONTAINER,
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IS_TRUE_OVERFLOW_CONTAINER(aFrame));
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const nsMargin& borderPadding = BorderPadding();
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if (aTopMarginRoot || 0 != aReflowState.mComputedBorderPadding.top) {
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SetFlag(BRS_ISTOPMARGINROOT, true);
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}
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if (aBottomMarginRoot || 0 != aReflowState.mComputedBorderPadding.bottom) {
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SetFlag(BRS_ISBOTTOMMARGINROOT, true);
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}
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if (GetFlag(BRS_ISTOPMARGINROOT)) {
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SetFlag(BRS_APPLYTOPMARGIN, true);
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}
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if (aBlockNeedsFloatManager) {
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SetFlag(BRS_FLOAT_MGR, true);
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}
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mFloatManager = aReflowState.mFloatManager;
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NS_ASSERTION(mFloatManager,
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"FloatManager should be set in nsBlockReflowState" );
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if (mFloatManager) {
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// Save the coordinate system origin for later.
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mFloatManager->GetTranslation(mFloatManagerX, mFloatManagerY);
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mFloatManager->PushState(&mFloatManagerStateBefore); // never popped
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}
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mReflowStatus = NS_FRAME_COMPLETE;
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mPresContext = aPresContext;
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mNextInFlow = static_cast<nsBlockFrame*>(mBlock->GetNextInFlow());
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NS_WARN_IF_FALSE(NS_UNCONSTRAINEDSIZE != aReflowState.ComputedWidth(),
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"have unconstrained width; this should only result from "
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"very large sizes, not attempts at intrinsic width "
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"calculation");
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mContentArea.width = aReflowState.ComputedWidth();
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// Compute content area height. Unlike the width, if we have a
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// specified style height we ignore it since extra content is
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// managed by the "overflow" property. When we don't have a
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// specified style height then we may end up limiting our height if
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// the availableHeight is constrained (this situation occurs when we
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// are paginated).
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if (NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight) {
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// We are in a paginated situation. The bottom edge is just inside
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// the bottom border and padding. The content area height doesn't
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// include either border or padding edge.
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mBottomEdge = aReflowState.availableHeight - borderPadding.bottom;
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mContentArea.height = NS_MAX(0, mBottomEdge - borderPadding.top);
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}
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else {
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// When we are not in a paginated situation then we always use
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// an constrained height.
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SetFlag(BRS_UNCONSTRAINEDHEIGHT, true);
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mContentArea.height = mBottomEdge = NS_UNCONSTRAINEDSIZE;
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}
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mContentArea.x = borderPadding.left;
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mY = mContentArea.y = borderPadding.top;
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mPrevChild = nsnull;
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mCurrentLine = aFrame->end_lines();
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mMinLineHeight = aReflowState.CalcLineHeight();
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}
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void
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nsBlockReflowState::ComputeReplacedBlockOffsetsForFloats(nsIFrame* aFrame,
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const nsRect& aFloatAvailableSpace,
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nscoord& aLeftResult,
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nscoord& aRightResult)
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{
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// The frame is clueless about the float manager and therefore we
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// only give it free space. An example is a table frame - the
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// tables do not flow around floats.
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// However, we can let its margins intersect floats.
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NS_ASSERTION(aFloatAvailableSpace.x >= mContentArea.x, "bad avail space rect x");
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NS_ASSERTION(aFloatAvailableSpace.width == 0 ||
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aFloatAvailableSpace.XMost() <= mContentArea.XMost(),
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"bad avail space rect width");
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nscoord leftOffset, rightOffset;
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if (aFloatAvailableSpace.width == mContentArea.width) {
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// We don't need to compute margins when there are no floats around.
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leftOffset = 0;
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rightOffset = 0;
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} else {
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nsMargin frameMargin;
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nsCSSOffsetState os(aFrame, mReflowState.rendContext, mContentArea.width);
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frameMargin = os.mComputedMargin;
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nscoord leftFloatXOffset = aFloatAvailableSpace.x - mContentArea.x;
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leftOffset = NS_MAX(leftFloatXOffset, frameMargin.left) -
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frameMargin.left;
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leftOffset = NS_MAX(leftOffset, 0); // in case of negative margin
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nscoord rightFloatXOffset =
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mContentArea.XMost() - aFloatAvailableSpace.XMost();
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rightOffset = NS_MAX(rightFloatXOffset, frameMargin.right) -
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frameMargin.right;
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rightOffset = NS_MAX(rightOffset, 0); // in case of negative margin
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}
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aLeftResult = leftOffset;
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aRightResult = rightOffset;
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}
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// Compute the amount of available space for reflowing a block frame
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// at the current Y coordinate. This method assumes that
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// GetAvailableSpace has already been called.
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void
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nsBlockReflowState::ComputeBlockAvailSpace(nsIFrame* aFrame,
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const nsStyleDisplay* aDisplay,
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const nsFlowAreaRect& aFloatAvailableSpace,
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bool aBlockAvoidsFloats,
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nsRect& aResult)
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{
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#ifdef REALLY_NOISY_REFLOW
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printf("CBAS frame=%p has floats %d\n",
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aFrame, aFloatAvailableSpace.mHasFloats);
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#endif
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aResult.y = mY;
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aResult.height = GetFlag(BRS_UNCONSTRAINEDHEIGHT)
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? NS_UNCONSTRAINEDSIZE
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: mReflowState.availableHeight - mY;
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// mY might be greater than mBottomEdge if the block's top margin pushes
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// it off the page/column. Negative available height can confuse other code
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// and is nonsense in principle.
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// XXX Do we really want this condition to be this restrictive (i.e.,
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// more restrictive than it used to be)? The |else| here is allowed
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// by the CSS spec, but only out of desperation given implementations,
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// and the behavior it leads to is quite undesirable (it can cause
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// things to become extremely narrow when they'd fit quite well a
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// little bit lower). Should the else be a quirk or something that
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// applies to a specific set of frame classes and no new ones?
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// If we did that, then for those frames where the condition below is
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// true but nsBlockFrame::BlockCanIntersectFloats is false,
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// nsBlockFrame::WidthToClearPastFloats would need to use the
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// shrink-wrap formula, max(MIN_WIDTH, min(avail width, PREF_WIDTH))
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// rather than just using MIN_WIDTH.
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NS_ASSERTION(nsBlockFrame::BlockCanIntersectFloats(aFrame) ==
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!aBlockAvoidsFloats,
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"unexpected replaced width");
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if (!aBlockAvoidsFloats) {
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if (aFloatAvailableSpace.mHasFloats) {
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// Use the float-edge property to determine how the child block
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// will interact with the float.
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const nsStyleBorder* borderStyle = aFrame->GetStyleBorder();
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switch (borderStyle->mFloatEdge) {
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default:
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case NS_STYLE_FLOAT_EDGE_CONTENT: // content and only content does runaround of floats
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// The child block will flow around the float. Therefore
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// give it all of the available space.
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aResult.x = mContentArea.x;
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aResult.width = mContentArea.width;
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break;
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case NS_STYLE_FLOAT_EDGE_MARGIN:
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{
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// The child block's margins should be placed adjacent to,
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// but not overlap the float.
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aResult.x = aFloatAvailableSpace.mRect.x;
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aResult.width = aFloatAvailableSpace.mRect.width;
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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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// Since there are no floats present the float-edge property
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// doesn't matter therefore give the block element all of the
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// available space since it will flow around the float itself.
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aResult.x = mContentArea.x;
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aResult.width = mContentArea.width;
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}
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}
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else {
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nscoord leftOffset, rightOffset;
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ComputeReplacedBlockOffsetsForFloats(aFrame, aFloatAvailableSpace.mRect,
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leftOffset, rightOffset);
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aResult.x = mContentArea.x + leftOffset;
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aResult.width = mContentArea.width - leftOffset - rightOffset;
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}
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#ifdef REALLY_NOISY_REFLOW
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printf(" CBAS: result %d %d %d %d\n", aResult.x, aResult.y, aResult.width, aResult.height);
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#endif
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}
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nsFlowAreaRect
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nsBlockReflowState::GetFloatAvailableSpaceWithState(
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nscoord aY,
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nsFloatManager::SavedState *aState) const
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{
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#ifdef DEBUG
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// Verify that the caller setup the coordinate system properly
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nscoord wx, wy;
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mFloatManager->GetTranslation(wx, wy);
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NS_ASSERTION((wx == mFloatManagerX) && (wy == mFloatManagerY),
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"bad coord system");
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#endif
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nscoord height = (mContentArea.height == nscoord_MAX)
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? nscoord_MAX : NS_MAX(mContentArea.YMost() - aY, 0);
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nsFlowAreaRect result =
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mFloatManager->GetFlowArea(aY, nsFloatManager::BAND_FROM_POINT,
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height, mContentArea, aState);
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// Keep the width >= 0 for compatibility with nsSpaceManager.
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if (result.mRect.width < 0)
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result.mRect.width = 0;
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyReflow) {
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nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
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printf("GetAvailableSpace: band=%d,%d,%d,%d hasfloats=%d\n",
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result.mRect.x, result.mRect.y, result.mRect.width,
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result.mRect.height, result.mHasFloats);
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}
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#endif
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return result;
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}
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nsFlowAreaRect
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nsBlockReflowState::GetFloatAvailableSpaceForHeight(
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nscoord aY, nscoord aHeight,
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nsFloatManager::SavedState *aState) const
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{
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#ifdef DEBUG
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// Verify that the caller setup the coordinate system properly
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nscoord wx, wy;
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mFloatManager->GetTranslation(wx, wy);
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NS_ASSERTION((wx == mFloatManagerX) && (wy == mFloatManagerY),
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"bad coord system");
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#endif
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nsFlowAreaRect result =
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mFloatManager->GetFlowArea(aY, nsFloatManager::WIDTH_WITHIN_HEIGHT,
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aHeight, mContentArea, aState);
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// Keep the width >= 0 for compatibility with nsSpaceManager.
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if (result.mRect.width < 0)
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result.mRect.width = 0;
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyReflow) {
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nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
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printf("GetAvailableSpaceForHeight: space=%d,%d,%d,%d hasfloats=%d\n",
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result.mRect.x, result.mRect.y, result.mRect.width,
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result.mRect.height, result.mHasFloats);
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}
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#endif
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return result;
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}
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/*
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* Reconstruct the vertical margin before the line |aLine| in order to
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* do an incremental reflow that begins with |aLine| without reflowing
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* the line before it. |aLine| may point to the fencepost at the end of
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* the line list, and it is used this way since we (for now, anyway)
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* always need to recover margins at the end of a block.
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*
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* The reconstruction involves walking backward through the line list to
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* find any collapsed margins preceding the line that would have been in
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* the reflow state's |mPrevBottomMargin| when we reflowed that line in
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* a full reflow (under the rule in CSS2 that all adjacent vertical
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* margins of blocks collapse).
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*/
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void
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nsBlockReflowState::ReconstructMarginAbove(nsLineList::iterator aLine)
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{
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mPrevBottomMargin.Zero();
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nsBlockFrame *block = mBlock;
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nsLineList::iterator firstLine = block->begin_lines();
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for (;;) {
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--aLine;
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if (aLine->IsBlock()) {
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mPrevBottomMargin = aLine->GetCarriedOutBottomMargin();
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break;
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}
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if (!aLine->IsEmpty()) {
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break;
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}
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if (aLine == firstLine) {
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// If the top margin was carried out (and thus already applied),
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// set it to zero. Either way, we're done.
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if (!GetFlag(BRS_ISTOPMARGINROOT)) {
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mPrevBottomMargin.Zero();
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}
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break;
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}
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}
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}
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void
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nsBlockReflowState::SetupPushedFloatList()
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{
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NS_ABORT_IF_FALSE(!GetFlag(BRS_PROPTABLE_FLOATCLIST) == !mPushedFloats,
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"flag mismatch");
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if (!GetFlag(BRS_PROPTABLE_FLOATCLIST)) {
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// If we're being re-Reflow'd without our next-in-flow having been
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// reflowed, some pushed floats from our previous reflow might
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// still be on our pushed floats list. However, that's
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// actually fine, since they'll all end up being stolen and
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// reordered into the correct order again.
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// (nsBlockFrame::ReflowDirtyLines ensures that any lines with
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// pushed floats are reflowed.)
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mPushedFloats = mBlock->EnsurePushedFloats();
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SetFlag(BRS_PROPTABLE_FLOATCLIST, true);
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}
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}
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/**
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* Restore information about floats into the float manager for an
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* incremental reflow, and simultaneously push the floats by
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* |aDeltaY|, which is the amount |aLine| was pushed relative to its
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* parent. The recovery of state is one of the things that makes
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* incremental reflow O(N^2) and this state should really be kept
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* around, attached to the frame tree.
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*/
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void
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nsBlockReflowState::RecoverFloats(nsLineList::iterator aLine,
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nscoord aDeltaY)
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{
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if (aLine->HasFloats()) {
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// Place the floats into the space-manager again. Also slide
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// them, just like the regular frames on the line.
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nsFloatCache* fc = aLine->GetFirstFloat();
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while (fc) {
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nsIFrame* floatFrame = fc->mFloat;
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if (aDeltaY != 0) {
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nsPoint p = floatFrame->GetPosition();
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floatFrame->SetPosition(nsPoint(p.x, p.y + aDeltaY));
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nsContainerFrame::PositionFrameView(floatFrame);
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nsContainerFrame::PositionChildViews(floatFrame);
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}
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyReflow || nsBlockFrame::gNoisyFloatManager) {
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nscoord tx, ty;
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mFloatManager->GetTranslation(tx, ty);
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nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
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printf("RecoverFloats: txy=%d,%d (%d,%d) ",
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tx, ty, mFloatManagerX, mFloatManagerY);
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nsFrame::ListTag(stdout, floatFrame);
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nsRect region = nsFloatManager::GetRegionFor(floatFrame);
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printf(" aDeltaY=%d region={%d,%d,%d,%d}\n",
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aDeltaY, region.x, region.y, region.width, region.height);
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}
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#endif
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mFloatManager->AddFloat(floatFrame,
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nsFloatManager::GetRegionFor(floatFrame));
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fc = fc->Next();
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}
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} else if (aLine->IsBlock()) {
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nsBlockFrame::RecoverFloatsFor(aLine->mFirstChild, *mFloatManager);
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}
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}
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/**
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* Everything done in this function is done O(N) times for each pass of
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* reflow so it is O(N*M) where M is the number of incremental reflow
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* passes. That's bad. Don't do stuff here.
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*
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* When this function is called, |aLine| has just been slid by |aDeltaY|
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* and the purpose of RecoverStateFrom is to ensure that the
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* nsBlockReflowState is in the same state that it would have been in
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* had the line just been reflowed.
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*
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* Most of the state recovery that we have to do involves floats.
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*/
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void
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nsBlockReflowState::RecoverStateFrom(nsLineList::iterator aLine,
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nscoord aDeltaY)
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{
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// Make the line being recovered the current line
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mCurrentLine = aLine;
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// Place floats for this line into the float manager
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if (aLine->HasFloats() || aLine->IsBlock()) {
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RecoverFloats(aLine, aDeltaY);
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyReflow || nsBlockFrame::gNoisyFloatManager) {
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mFloatManager->List(stdout);
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}
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#endif
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}
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}
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// This is called by the line layout's AddFloat method when a
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// place-holder frame is reflowed in a line. If the float is a
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// left-most child (it's x coordinate is at the line's left margin)
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// then the float is place immediately, otherwise the float
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// placement is deferred until the line has been reflowed.
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// XXXldb This behavior doesn't quite fit with CSS1 and CSS2 --
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// technically we're supposed let the current line flow around the
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// float as well unless it won't fit next to what we already have.
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// But nobody else implements it that way...
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bool
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nsBlockReflowState::AddFloat(nsLineLayout* aLineLayout,
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nsIFrame* aFloat,
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nscoord aAvailableWidth)
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{
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NS_PRECONDITION(aLineLayout, "must have line layout");
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NS_PRECONDITION(mBlock->end_lines() != mCurrentLine, "null ptr");
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NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
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"aFloat must be an out-of-flow frame");
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NS_ABORT_IF_FALSE(aFloat->GetParent(), "float must have parent");
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NS_ABORT_IF_FALSE(aFloat->GetParent()->IsFrameOfType(nsIFrame::eBlockFrame),
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"float's parent must be block");
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NS_ABORT_IF_FALSE(aFloat->GetParent() == mBlock ||
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(aFloat->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT),
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"float should be in this block unless it was marked as "
|
|
"pushed float");
|
|
if (aFloat->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT) {
|
|
// If, in a previous reflow, the float was pushed entirely to
|
|
// another column/page, we need to steal it back. (We might just
|
|
// push it again, though.) Likewise, if that previous reflow
|
|
// reflowed this block but not its next continuation, we might need
|
|
// to steal it from our own float-continuations list.
|
|
nsBlockFrame *floatParent =
|
|
static_cast<nsBlockFrame*>(aFloat->GetParent());
|
|
floatParent->StealFrame(mPresContext, aFloat);
|
|
|
|
aFloat->RemoveStateBits(NS_FRAME_IS_PUSHED_FLOAT);
|
|
|
|
// Appending is fine, since if a float was pushed to the next
|
|
// page/column, all later floats were also pushed.
|
|
mBlock->mFloats.AppendFrame(mBlock, aFloat);
|
|
}
|
|
|
|
// Because we are in the middle of reflowing a placeholder frame
|
|
// within a line (and possibly nested in an inline frame or two
|
|
// that's a child of our block) we need to restore the space
|
|
// manager's translation to the space that the block resides in
|
|
// before placing the float.
|
|
nscoord ox, oy;
|
|
mFloatManager->GetTranslation(ox, oy);
|
|
nscoord dx = ox - mFloatManagerX;
|
|
nscoord dy = oy - mFloatManagerY;
|
|
mFloatManager->Translate(-dx, -dy);
|
|
|
|
bool placed;
|
|
|
|
// Now place the float immediately if possible. Otherwise stash it
|
|
// away in mPendingFloats and place it later.
|
|
// If one or more floats has already been pushed to the next line,
|
|
// don't let this one go on the current line, since that would violate
|
|
// float ordering.
|
|
nsRect floatAvailableSpace = GetFloatAvailableSpace().mRect;
|
|
if (mBelowCurrentLineFloats.IsEmpty() &&
|
|
(aLineLayout->LineIsEmpty() ||
|
|
mBlock->ComputeFloatWidth(*this, floatAvailableSpace, aFloat)
|
|
<= aAvailableWidth)) {
|
|
// And then place it
|
|
placed = FlowAndPlaceFloat(aFloat);
|
|
if (placed) {
|
|
// Pass on updated available space to the current inline reflow engine
|
|
nsFlowAreaRect floatAvailSpace = GetFloatAvailableSpace(mY);
|
|
nsRect availSpace(nsPoint(floatAvailSpace.mRect.x, mY),
|
|
floatAvailSpace.mRect.Size());
|
|
aLineLayout->UpdateBand(availSpace, aFloat);
|
|
// Record this float in the current-line list
|
|
mCurrentLineFloats.Append(mFloatCacheFreeList.Alloc(aFloat));
|
|
} else {
|
|
(*aLineLayout->GetLine())->SetHadFloatPushed();
|
|
}
|
|
}
|
|
else {
|
|
// Always claim to be placed; we don't know whether we fit yet, so we
|
|
// deal with this in PlaceBelowCurrentLineFloats
|
|
placed = true;
|
|
// This float will be placed after the line is done (it is a
|
|
// below-current-line float).
|
|
mBelowCurrentLineFloats.Append(mFloatCacheFreeList.Alloc(aFloat));
|
|
}
|
|
|
|
// Restore coordinate system
|
|
mFloatManager->Translate(dx, dy);
|
|
|
|
return placed;
|
|
}
|
|
|
|
bool
|
|
nsBlockReflowState::CanPlaceFloat(nscoord aFloatWidth,
|
|
const nsFlowAreaRect& aFloatAvailableSpace)
|
|
{
|
|
// A float fits at a given vertical position if there are no floats at
|
|
// its horizontal position (no matter what its width) or if its width
|
|
// fits in the space remaining after prior floats have been placed.
|
|
// FIXME: We should allow overflow by up to half a pixel here (bug 21193).
|
|
return !aFloatAvailableSpace.mHasFloats ||
|
|
aFloatAvailableSpace.mRect.width >= aFloatWidth;
|
|
}
|
|
|
|
static nscoord
|
|
FloatMarginWidth(const nsHTMLReflowState& aCBReflowState,
|
|
nscoord aFloatAvailableWidth,
|
|
nsIFrame *aFloat,
|
|
const nsCSSOffsetState& aFloatOffsetState)
|
|
{
|
|
AutoMaybeDisableFontInflation an(aFloat);
|
|
return aFloat->ComputeSize(
|
|
aCBReflowState.rendContext,
|
|
nsSize(aCBReflowState.ComputedWidth(),
|
|
aCBReflowState.ComputedHeight()),
|
|
aFloatAvailableWidth,
|
|
nsSize(aFloatOffsetState.mComputedMargin.LeftRight(),
|
|
aFloatOffsetState.mComputedMargin.TopBottom()),
|
|
nsSize(aFloatOffsetState.mComputedBorderPadding.LeftRight() -
|
|
aFloatOffsetState.mComputedPadding.LeftRight(),
|
|
aFloatOffsetState.mComputedBorderPadding.TopBottom() -
|
|
aFloatOffsetState.mComputedPadding.TopBottom()),
|
|
nsSize(aFloatOffsetState.mComputedPadding.LeftRight(),
|
|
aFloatOffsetState.mComputedPadding.TopBottom()),
|
|
true).width +
|
|
aFloatOffsetState.mComputedMargin.LeftRight() +
|
|
aFloatOffsetState.mComputedBorderPadding.LeftRight();
|
|
}
|
|
|
|
bool
|
|
nsBlockReflowState::FlowAndPlaceFloat(nsIFrame* aFloat)
|
|
{
|
|
// Save away the Y coordinate before placing the float. We will
|
|
// restore mY at the end after placing the float. This is
|
|
// necessary because any adjustments to mY during the float
|
|
// placement are for the float only, not for any non-floating
|
|
// content.
|
|
AutoRestore<nscoord> restoreY(mY);
|
|
// FIXME: Should give AutoRestore a getter for the value to avoid this.
|
|
const nscoord saveY = mY;
|
|
|
|
// Grab the float's display information
|
|
const nsStyleDisplay* floatDisplay = aFloat->GetStyleDisplay();
|
|
|
|
// The float's old region, so we can propagate damage.
|
|
nsRect oldRegion = nsFloatManager::GetRegionFor(aFloat);
|
|
|
|
// Enforce CSS2 9.5.1 rule [2], i.e., make sure that a float isn't
|
|
// ``above'' another float that preceded it in the flow.
|
|
mY = NS_MAX(mFloatManager->GetLowestFloatTop(), mY);
|
|
|
|
// See if the float should clear any preceding floats...
|
|
// XXX We need to mark this float somehow so that it gets reflowed
|
|
// when floats are inserted before it.
|
|
if (NS_STYLE_CLEAR_NONE != floatDisplay->mBreakType) {
|
|
// XXXldb Does this handle vertical margins correctly?
|
|
mY = ClearFloats(mY, floatDisplay->mBreakType);
|
|
}
|
|
// Get the band of available space
|
|
nsFlowAreaRect floatAvailableSpace = GetFloatAvailableSpace(mY);
|
|
nsRect adjustedAvailableSpace = mBlock->AdjustFloatAvailableSpace(*this,
|
|
floatAvailableSpace.mRect, aFloat);
|
|
|
|
NS_ASSERTION(aFloat->GetParent() == mBlock,
|
|
"Float frame has wrong parent");
|
|
|
|
nsCSSOffsetState offsets(aFloat, mReflowState.rendContext,
|
|
mReflowState.ComputedWidth());
|
|
|
|
nscoord floatMarginWidth = FloatMarginWidth(mReflowState,
|
|
adjustedAvailableSpace.width,
|
|
aFloat, offsets);
|
|
|
|
nsMargin floatMargin; // computed margin
|
|
nsReflowStatus reflowStatus;
|
|
|
|
// If it's a floating first-letter, we need to reflow it before we
|
|
// know how wide it is (since we don't compute which letters are part
|
|
// of the first letter until reflow!).
|
|
bool isLetter = aFloat->GetType() == nsGkAtoms::letterFrame;
|
|
if (isLetter) {
|
|
mBlock->ReflowFloat(*this, adjustedAvailableSpace, aFloat,
|
|
floatMargin, false, reflowStatus);
|
|
floatMarginWidth = aFloat->GetSize().width + floatMargin.LeftRight();
|
|
NS_ASSERTION(NS_FRAME_IS_COMPLETE(reflowStatus),
|
|
"letter frames shouldn't break, and if they do now, "
|
|
"then they're breaking at the wrong point");
|
|
}
|
|
|
|
// Find a place to place the float. The CSS2 spec doesn't want
|
|
// floats overlapping each other or sticking out of the containing
|
|
// block if possible (CSS2 spec section 9.5.1, see the rule list).
|
|
NS_ASSERTION((NS_STYLE_FLOAT_LEFT == floatDisplay->mFloats) ||
|
|
(NS_STYLE_FLOAT_RIGHT == floatDisplay->mFloats),
|
|
"invalid float type");
|
|
|
|
// Can the float fit here?
|
|
bool keepFloatOnSameLine = false;
|
|
|
|
// Are we required to place at least part of the float because we're
|
|
// at the top of the page (to avoid an infinite loop of pushing and
|
|
// breaking).
|
|
bool mustPlaceFloat =
|
|
mReflowState.mFlags.mIsTopOfPage && IsAdjacentWithTop();
|
|
|
|
for (;;) {
|
|
if (mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE &&
|
|
floatAvailableSpace.mRect.height <= 0 &&
|
|
!mustPlaceFloat) {
|
|
// No space, nowhere to put anything.
|
|
PushFloatPastBreak(aFloat);
|
|
return false;
|
|
}
|
|
|
|
if (CanPlaceFloat(floatMarginWidth, floatAvailableSpace)) {
|
|
// We found an appropriate place.
|
|
break;
|
|
}
|
|
|
|
// Nope. try to advance to the next band.
|
|
if (NS_STYLE_DISPLAY_TABLE != floatDisplay->mDisplay ||
|
|
eCompatibility_NavQuirks != mPresContext->CompatibilityMode() ) {
|
|
|
|
mY += floatAvailableSpace.mRect.height;
|
|
if (adjustedAvailableSpace.height != NS_UNCONSTRAINEDSIZE) {
|
|
adjustedAvailableSpace.height -= floatAvailableSpace.mRect.height;
|
|
}
|
|
floatAvailableSpace = GetFloatAvailableSpace(mY);
|
|
} else {
|
|
// This quirk matches the one in nsBlockFrame::AdjustFloatAvailableSpace
|
|
// IE handles float tables in a very special way
|
|
|
|
// see if the previous float is also a table and has "align"
|
|
nsFloatCache* fc = mCurrentLineFloats.Head();
|
|
nsIFrame* prevFrame = nsnull;
|
|
while (fc) {
|
|
if (fc->mFloat == aFloat) {
|
|
break;
|
|
}
|
|
prevFrame = fc->mFloat;
|
|
fc = fc->Next();
|
|
}
|
|
|
|
if(prevFrame) {
|
|
//get the frame type
|
|
if (nsGkAtoms::tableOuterFrame == prevFrame->GetType()) {
|
|
//see if it has "align="
|
|
// IE makes a difference between align and he float property
|
|
nsIContent* content = prevFrame->GetContent();
|
|
if (content) {
|
|
// we're interested only if previous frame is align=left
|
|
// IE messes things up when "right" (overlapping frames)
|
|
if (content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::align,
|
|
NS_LITERAL_STRING("left"), eIgnoreCase)) {
|
|
keepFloatOnSameLine = true;
|
|
// don't advance to next line (IE quirkie behaviour)
|
|
// it breaks rule CSS2/9.5.1/1, but what the hell
|
|
// since we cannot evangelize the world
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// the table does not fit anymore in this line so advance to next band
|
|
mY += floatAvailableSpace.mRect.height;
|
|
// To match nsBlockFrame::AdjustFloatAvailableSpace, we have to
|
|
// get a new width for the new band.
|
|
floatAvailableSpace = GetFloatAvailableSpace(mY);
|
|
adjustedAvailableSpace = mBlock->AdjustFloatAvailableSpace(*this,
|
|
floatAvailableSpace.mRect, aFloat);
|
|
floatMarginWidth = FloatMarginWidth(mReflowState,
|
|
adjustedAvailableSpace.width,
|
|
aFloat, offsets);
|
|
}
|
|
|
|
mustPlaceFloat = false;
|
|
}
|
|
|
|
// If the float is continued, it will get the same absolute x value as its prev-in-flow
|
|
|
|
// We don't worry about the geometry of the prev in flow, let the continuation
|
|
// place and size itself as required.
|
|
|
|
// Assign an x and y coordinate to the float.
|
|
nscoord floatX, floatY;
|
|
if (NS_STYLE_FLOAT_LEFT == floatDisplay->mFloats) {
|
|
floatX = floatAvailableSpace.mRect.x;
|
|
}
|
|
else {
|
|
if (!keepFloatOnSameLine) {
|
|
floatX = floatAvailableSpace.mRect.XMost() - floatMarginWidth;
|
|
}
|
|
else {
|
|
// this is the IE quirk (see few lines above)
|
|
// the table is kept in the same line: don't let it overlap the
|
|
// previous float
|
|
floatX = floatAvailableSpace.mRect.x;
|
|
}
|
|
}
|
|
// CSS2 spec, 9.5.1 rule [4]: "A floating box's outer top may not
|
|
// be higher than the top of its containing block." (Since the
|
|
// containing block is the content edge of the block box, this
|
|
// means the margin edge of the float can't be higher than the
|
|
// content edge of the block that contains it.)
|
|
floatY = NS_MAX(mY, mContentArea.y);
|
|
|
|
// Reflow the float after computing its vertical position so it knows
|
|
// where to break.
|
|
if (!isLetter) {
|
|
bool pushedDown = mY != saveY;
|
|
mBlock->ReflowFloat(*this, adjustedAvailableSpace, aFloat,
|
|
floatMargin, pushedDown, reflowStatus);
|
|
}
|
|
if (aFloat->GetPrevInFlow())
|
|
floatMargin.top = 0;
|
|
if (NS_FRAME_IS_NOT_COMPLETE(reflowStatus))
|
|
floatMargin.bottom = 0;
|
|
|
|
// In the case that we're in columns and not splitting floats, we need
|
|
// to check here that the float's height fit, and if it didn't, bail.
|
|
// (This code is only for DISABLE_FLOAT_BREAKING_IN_COLUMNS .)
|
|
//
|
|
// Likewise, if none of the float fit, and it needs to be pushed in
|
|
// its entirety to the next page (NS_FRAME_IS_TRUNCATED), we need to
|
|
// do the same.
|
|
if ((mContentArea.height != NS_UNCONSTRAINEDSIZE &&
|
|
adjustedAvailableSpace.height == NS_UNCONSTRAINEDSIZE &&
|
|
!mustPlaceFloat &&
|
|
aFloat->GetSize().height + floatMargin.TopBottom() >
|
|
mContentArea.YMost() - floatY) ||
|
|
NS_FRAME_IS_TRUNCATED(reflowStatus)) {
|
|
|
|
PushFloatPastBreak(aFloat);
|
|
return false;
|
|
}
|
|
|
|
// Calculate the actual origin of the float frame's border rect
|
|
// relative to the parent block; the margin must be added in
|
|
// to get the border rect
|
|
nsPoint origin(floatMargin.left + floatX,
|
|
floatMargin.top + floatY);
|
|
|
|
// If float is relatively positioned, factor that in as well
|
|
origin += aFloat->GetRelativeOffset(floatDisplay);
|
|
|
|
// Position the float and make sure and views are properly
|
|
// positioned. We need to explicitly position its child views as
|
|
// well, since we're moving the float after flowing it.
|
|
bool moved = aFloat->GetPosition() != origin;
|
|
if (moved) {
|
|
aFloat->SetPosition(origin);
|
|
nsContainerFrame::PositionFrameView(aFloat);
|
|
nsContainerFrame::PositionChildViews(aFloat);
|
|
FrameLayerBuilder::InvalidateThebesLayersInSubtree(aFloat);
|
|
}
|
|
|
|
// Update the float combined area state
|
|
// XXX Floats should really just get invalidated here if necessary
|
|
mFloatOverflowAreas.UnionWith(aFloat->GetOverflowAreas() + origin);
|
|
|
|
// Place the float in the float manager
|
|
// calculate region
|
|
nsRect region = nsFloatManager::CalculateRegionFor(aFloat, floatMargin);
|
|
// if the float split, then take up all of the vertical height
|
|
if (NS_FRAME_IS_NOT_COMPLETE(reflowStatus) &&
|
|
(NS_UNCONSTRAINEDSIZE != mContentArea.height)) {
|
|
region.height = NS_MAX(region.height, mContentArea.height - floatY);
|
|
}
|
|
nsresult rv =
|
|
mFloatManager->AddFloat(aFloat, region);
|
|
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv), "bad float placement");
|
|
// store region
|
|
nsFloatManager::StoreRegionFor(aFloat, region);
|
|
|
|
// If the float's dimensions have changed, note the damage in the
|
|
// float manager.
|
|
if (!region.IsEqualEdges(oldRegion)) {
|
|
// XXXwaterson conservative: we could probably get away with noting
|
|
// less damage; e.g., if only height has changed, then only note the
|
|
// area into which the float has grown or from which the float has
|
|
// shrunk.
|
|
nscoord top = NS_MIN(region.y, oldRegion.y);
|
|
nscoord bottom = NS_MAX(region.YMost(), oldRegion.YMost());
|
|
mFloatManager->IncludeInDamage(top, bottom);
|
|
}
|
|
|
|
if (!NS_FRAME_IS_FULLY_COMPLETE(reflowStatus)) {
|
|
mBlock->SplitFloat(*this, aFloat, reflowStatus);
|
|
}
|
|
|
|
#ifdef NOISY_FLOATMANAGER
|
|
nscoord tx, ty;
|
|
mFloatManager->GetTranslation(tx, ty);
|
|
nsFrame::ListTag(stdout, mBlock);
|
|
printf(": FlowAndPlaceFloat: AddFloat: txy=%d,%d (%d,%d) {%d,%d,%d,%d}\n",
|
|
tx, ty, mFloatManagerX, mFloatManagerY,
|
|
region.x, region.y, region.width, region.height);
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsRect r = aFloat->GetRect();
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("placed float: ");
|
|
nsFrame::ListTag(stdout, aFloat);
|
|
printf(" %d,%d,%d,%d\n", r.x, r.y, r.width, r.height);
|
|
}
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
nsBlockReflowState::PushFloatPastBreak(nsIFrame *aFloat)
|
|
{
|
|
// This ensures that we:
|
|
// * don't try to place later but smaller floats (which CSS says
|
|
// must have their tops below the top of this float)
|
|
// * don't waste much time trying to reflow this float again until
|
|
// after the break
|
|
if (aFloat->GetStyleDisplay()->mFloats == NS_STYLE_FLOAT_LEFT) {
|
|
mFloatManager->SetPushedLeftFloatPastBreak();
|
|
} else {
|
|
NS_ABORT_IF_FALSE(aFloat->GetStyleDisplay()->mFloats ==
|
|
NS_STYLE_FLOAT_RIGHT,
|
|
"unexpected float value");
|
|
mFloatManager->SetPushedRightFloatPastBreak();
|
|
}
|
|
|
|
// Put the float on the pushed floats list, even though it
|
|
// isn't actually a continuation.
|
|
DebugOnly<nsresult> rv = mBlock->StealFrame(mPresContext, aFloat);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame should succeed");
|
|
AppendPushedFloat(aFloat);
|
|
|
|
NS_FRAME_SET_OVERFLOW_INCOMPLETE(mReflowStatus);
|
|
}
|
|
|
|
/**
|
|
* Place below-current-line floats.
|
|
*/
|
|
void
|
|
nsBlockReflowState::PlaceBelowCurrentLineFloats(nsFloatCacheFreeList& aList,
|
|
nsLineBox* aLine)
|
|
{
|
|
nsFloatCache* fc = aList.Head();
|
|
while (fc) {
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("placing bcl float: ");
|
|
nsFrame::ListTag(stdout, fc->mFloat);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
// Place the float
|
|
bool placed = FlowAndPlaceFloat(fc->mFloat);
|
|
nsFloatCache *next = fc->Next();
|
|
if (!placed) {
|
|
aList.Remove(fc);
|
|
delete fc;
|
|
aLine->SetHadFloatPushed();
|
|
}
|
|
fc = next;
|
|
}
|
|
}
|
|
|
|
nscoord
|
|
nsBlockReflowState::ClearFloats(nscoord aY, PRUint8 aBreakType,
|
|
nsIFrame *aReplacedBlock,
|
|
PRUint32 aFlags)
|
|
{
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("clear floats: in: aY=%d\n", aY);
|
|
}
|
|
#endif
|
|
|
|
#ifdef NOISY_FLOAT_CLEARING
|
|
printf("nsBlockReflowState::ClearFloats: aY=%d breakType=%d\n",
|
|
aY, aBreakType);
|
|
mFloatManager->List(stdout);
|
|
#endif
|
|
|
|
nscoord newY = aY;
|
|
|
|
if (aBreakType != NS_STYLE_CLEAR_NONE) {
|
|
newY = mFloatManager->ClearFloats(newY, aBreakType, aFlags);
|
|
}
|
|
|
|
if (aReplacedBlock) {
|
|
for (;;) {
|
|
nsFlowAreaRect floatAvailableSpace = GetFloatAvailableSpace(newY);
|
|
nsBlockFrame::ReplacedElementWidthToClear replacedWidth =
|
|
nsBlockFrame::WidthToClearPastFloats(*this, floatAvailableSpace.mRect,
|
|
aReplacedBlock);
|
|
if (!floatAvailableSpace.mHasFloats ||
|
|
NS_MAX(floatAvailableSpace.mRect.x - mContentArea.x,
|
|
replacedWidth.marginLeft) +
|
|
replacedWidth.borderBoxWidth +
|
|
NS_MAX(mContentArea.XMost() - floatAvailableSpace.mRect.XMost(),
|
|
replacedWidth.marginRight) <=
|
|
mContentArea.width) {
|
|
break;
|
|
}
|
|
// See the analogous code for inlines in nsBlockFrame::DoReflowInlineFrames
|
|
if (floatAvailableSpace.mRect.height > 0) {
|
|
// See if there's room in the next band.
|
|
newY += floatAvailableSpace.mRect.height;
|
|
} else {
|
|
if (mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
|
|
// Stop trying to clear here; we'll just get pushed to the
|
|
// next column or page and try again there.
|
|
break;
|
|
}
|
|
NS_NOTREACHED("avail space rect with zero height!");
|
|
newY += 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("clear floats: out: y=%d\n", newY);
|
|
}
|
|
#endif
|
|
|
|
return newY;
|
|
}
|
|
|