зеркало из https://github.com/mozilla/pjs.git
2335 строки
91 KiB
C++
2335 строки
91 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* struct containing the input to nsIFrame::Reflow */
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#include "nsCOMPtr.h"
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#include "nsStyleConsts.h"
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#include "nsCSSAnonBoxes.h"
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#include "nsFrame.h"
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#include "nsIContent.h"
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#include "nsGkAtoms.h"
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#include "nsPresContext.h"
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#include "nsIPresShell.h"
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#include "nsIDeviceContext.h"
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#include "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsBlockFrame.h"
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#include "nsLineBox.h"
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#include "nsImageFrame.h"
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#include "nsTableFrame.h"
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#include "nsTableCellFrame.h"
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#include "nsIServiceManager.h"
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#include "nsIPercentHeightObserver.h"
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#include "nsContentUtils.h"
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#include "nsLayoutUtils.h"
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#ifdef IBMBIDI
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#include "nsBidiUtils.h"
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#endif
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#ifdef NS_DEBUG
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#undef NOISY_VERTICAL_ALIGN
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#else
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#undef NOISY_VERTICAL_ALIGN
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#endif
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// Prefs-driven control for |text-decoration: blink|
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static PRPackedBool sPrefIsLoaded = PR_FALSE;
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static PRPackedBool sBlinkIsAllowed = PR_TRUE;
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enum eNormalLineHeightControl {
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eUninitialized = -1,
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eNoExternalLeading = 0, // does not include external leading
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eIncludeExternalLeading, // use whatever value font vendor provides
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eCompensateLeading // compensate leading if leading provided by font vendor is not enough
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};
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static eNormalLineHeightControl sNormalLineHeightControl = eUninitialized;
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// Initialize a <b>root</b> reflow state with a rendering context to
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// use for measuring things.
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nsHTMLReflowState::nsHTMLReflowState(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIRenderingContext* aRenderingContext,
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const nsSize& aAvailableSpace)
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: nsCSSOffsetState(aFrame, aRenderingContext)
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, mBlockDelta(0)
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, mReflowDepth(0)
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{
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NS_PRECONDITION(aPresContext, "no pres context");
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NS_PRECONDITION(aRenderingContext, "no rendering context");
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NS_PRECONDITION(aFrame, "no frame");
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parentReflowState = nsnull;
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availableWidth = aAvailableSpace.width;
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availableHeight = aAvailableSpace.height;
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mFloatManager = nsnull;
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mLineLayout = nsnull;
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mFlags.mSpecialHeightReflow = PR_FALSE;
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mFlags.mIsTopOfPage = PR_FALSE;
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mFlags.mTableIsSplittable = PR_FALSE;
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mFlags.mNextInFlowUntouched = PR_FALSE;
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mFlags.mAssumingHScrollbar = mFlags.mAssumingVScrollbar = PR_FALSE;
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mFlags.mHasClearance = PR_FALSE;
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mFlags.mHeightDependsOnAncestorCell = PR_FALSE;
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mDiscoveredClearance = nsnull;
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mPercentHeightObserver = nsnull;
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Init(aPresContext);
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}
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static PRBool CheckNextInFlowParenthood(nsIFrame* aFrame, nsIFrame* aParent)
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{
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nsIFrame* frameNext = aFrame->GetNextInFlow();
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nsIFrame* parentNext = aParent->GetNextInFlow();
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return frameNext && parentNext && frameNext->GetParent() == parentNext;
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}
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// Initialize a reflow state for a child frames reflow. Some state
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// is copied from the parent reflow state; the remaining state is
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// computed.
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nsHTMLReflowState::nsHTMLReflowState(nsPresContext* aPresContext,
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const nsHTMLReflowState& aParentReflowState,
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nsIFrame* aFrame,
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const nsSize& aAvailableSpace,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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PRBool aInit)
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: nsCSSOffsetState(aFrame, aParentReflowState.rendContext)
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, mBlockDelta(0)
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, mReflowDepth(aParentReflowState.mReflowDepth + 1)
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, mFlags(aParentReflowState.mFlags)
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{
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NS_PRECONDITION(aPresContext, "no pres context");
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NS_PRECONDITION(aFrame, "no frame");
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NS_PRECONDITION((aContainingBlockWidth == -1) ==
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(aContainingBlockHeight == -1),
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"cb width and height should only be non-default together");
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NS_PRECONDITION(aInit == PR_TRUE || aInit == PR_FALSE,
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"aInit out of range for PRBool");
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NS_PRECONDITION(!mFlags.mSpecialHeightReflow ||
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!NS_SUBTREE_DIRTY(aFrame),
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"frame should be clean when getting special height reflow");
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parentReflowState = &aParentReflowState;
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// If the parent is dirty, then the child is as well.
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// XXX Are the other cases where the parent reflows a child a second
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// time, as a resize?
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if (!mFlags.mSpecialHeightReflow)
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frame->AddStateBits(parentReflowState->frame->GetStateBits() &
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NS_FRAME_IS_DIRTY);
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availableWidth = aAvailableSpace.width;
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availableHeight = aAvailableSpace.height;
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mFloatManager = aParentReflowState.mFloatManager;
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if (frame->IsFrameOfType(nsIFrame::eLineParticipant))
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mLineLayout = aParentReflowState.mLineLayout;
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else
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mLineLayout = nsnull;
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mFlags.mIsTopOfPage = aParentReflowState.mFlags.mIsTopOfPage;
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mFlags.mNextInFlowUntouched = aParentReflowState.mFlags.mNextInFlowUntouched &&
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CheckNextInFlowParenthood(aFrame, aParentReflowState.frame);
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mFlags.mAssumingHScrollbar = mFlags.mAssumingVScrollbar = PR_FALSE;
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mFlags.mHasClearance = PR_FALSE;
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mDiscoveredClearance = nsnull;
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mPercentHeightObserver = (aParentReflowState.mPercentHeightObserver &&
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aParentReflowState.mPercentHeightObserver->NeedsToObserve(*this))
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? aParentReflowState.mPercentHeightObserver : nsnull;
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if (aInit) {
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Init(aPresContext, aContainingBlockWidth, aContainingBlockHeight);
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}
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}
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inline nscoord
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nsCSSOffsetState::ComputeWidthValue(nscoord aContainingBlockWidth,
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nscoord aContentEdgeToBoxSizing,
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nscoord aBoxSizingToMarginEdge,
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const nsStyleCoord& aCoord)
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{
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return nsLayoutUtils::ComputeWidthValue(rendContext, frame,
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aContainingBlockWidth,
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aContentEdgeToBoxSizing,
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aBoxSizingToMarginEdge,
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aCoord);
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}
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nscoord
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nsCSSOffsetState::ComputeWidthValue(nscoord aContainingBlockWidth,
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PRUint8 aBoxSizing,
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const nsStyleCoord& aCoord)
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{
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nscoord inside = 0, outside = mComputedBorderPadding.LeftRight() +
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mComputedMargin.LeftRight();
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switch (aBoxSizing) {
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case NS_STYLE_BOX_SIZING_BORDER:
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inside = mComputedBorderPadding.LeftRight();
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break;
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case NS_STYLE_BOX_SIZING_PADDING:
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inside = mComputedPadding.LeftRight();
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break;
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}
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outside -= inside;
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return ComputeWidthValue(aContainingBlockWidth, inside,
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outside, aCoord);
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}
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void
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nsHTMLReflowState::SetComputedWidth(nscoord aComputedWidth)
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{
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NS_ASSERTION(frame, "Must have a frame!");
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// It'd be nice to assert that |frame| is not in reflow, but this fails for
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// two reasons:
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//
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// 1) Viewport frames reset the computed width on a copy of their reflow
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// state when reflowing fixed-pos kids. In that case we actually don't
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// want to mess with the resize flags, because comparing the frame's rect
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// to the munged computed width is pointless.
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// 2) nsFrame::BoxReflow creates a reflow state for its parent. This reflow
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// state is not used to reflow the parent, but just as a parent for the
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// frame's own reflow state. So given a nsBoxFrame inside some non-XUL
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// (like a text control, for example), we'll end up creating a reflow
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// state for the parent while the parent is reflowing.
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NS_PRECONDITION(aComputedWidth >= 0, "Invalid computed width");
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if (mComputedWidth != aComputedWidth) {
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mComputedWidth = aComputedWidth;
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if (frame->GetType() != nsGkAtoms::viewportFrame) { // Or check GetParent()?
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InitResizeFlags(frame->PresContext());
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}
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}
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}
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void
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nsHTMLReflowState::SetComputedHeight(nscoord aComputedHeight)
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{
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NS_ASSERTION(frame, "Must have a frame!");
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// It'd be nice to assert that |frame| is not in reflow, but this fails
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// because:
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//
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// nsFrame::BoxReflow creates a reflow state for its parent. This reflow
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// state is not used to reflow the parent, but just as a parent for the
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// frame's own reflow state. So given a nsBoxFrame inside some non-XUL
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// (like a text control, for example), we'll end up creating a reflow
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// state for the parent while the parent is reflowing.
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NS_PRECONDITION(aComputedHeight >= 0, "Invalid computed height");
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if (mComputedHeight != aComputedHeight) {
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mComputedHeight = aComputedHeight;
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InitResizeFlags(frame->PresContext());
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}
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}
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void
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nsHTMLReflowState::Init(nsPresContext* aPresContext,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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const nsMargin* aBorder,
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const nsMargin* aPadding)
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{
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NS_ASSERTION(availableWidth != NS_UNCONSTRAINEDSIZE,
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"shouldn't use unconstrained widths anymore");
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mStylePosition = frame->GetStylePosition();
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mStyleDisplay = frame->GetStyleDisplay();
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mStyleVisibility = frame->GetStyleVisibility();
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mStyleBorder = frame->GetStyleBorder();
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mStyleMargin = frame->GetStyleMargin();
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mStylePadding = frame->GetStylePadding();
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mStyleText = frame->GetStyleText();
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InitFrameType();
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InitCBReflowState();
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InitConstraints(aPresContext, aContainingBlockWidth, aContainingBlockHeight, aBorder, aPadding);
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InitResizeFlags(aPresContext);
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NS_ASSERTION((mFrameType == NS_CSS_FRAME_TYPE_INLINE &&
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!frame->IsFrameOfType(nsIFrame::eReplaced)) ||
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frame->GetType() == nsGkAtoms::textFrame ||
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mComputedWidth != NS_UNCONSTRAINEDSIZE,
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"shouldn't use unconstrained widths anymore");
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}
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void nsHTMLReflowState::InitCBReflowState()
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{
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if (!parentReflowState) {
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mCBReflowState = nsnull;
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return;
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}
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// If outer tables ever become containing blocks, we need to make sure to use
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// their mCBReflowState in the non-absolutely-positioned case for inner
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// tables.
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NS_ASSERTION(frame->GetType() != nsGkAtoms::tableFrame ||
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!frame->GetParent()->IsContainingBlock(),
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"Outer table should not be containing block");
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if (parentReflowState->frame->IsContainingBlock() ||
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// Absolutely positioned frames should always be kids of the frames that
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// determine their containing block
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(NS_FRAME_GET_TYPE(mFrameType) == NS_CSS_FRAME_TYPE_ABSOLUTE)) {
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// a block inside a table cell needs to use the table cell, and an
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// absolutely positioned inner table needs to use the parent of the outer
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// table.
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if (parentReflowState->parentReflowState &&
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(IS_TABLE_CELL(parentReflowState->parentReflowState->frame->GetType()) ||
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frame->GetType() == nsGkAtoms::tableFrame)) {
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mCBReflowState = parentReflowState->parentReflowState;
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} else {
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mCBReflowState = parentReflowState;
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}
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return;
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}
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mCBReflowState = parentReflowState->mCBReflowState;
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}
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/* Check whether CalcQuirkContainingBlockHeight would stop on the
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* given reflow state, using its block as a height. (essentially
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* returns false for any case in which CalcQuirkContainingBlockHeight
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* has a "continue" in its main loop.)
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*
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* XXX Maybe refactor CalcQuirkContainingBlockHeight so it uses
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* this function as well
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*/
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static PRBool
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IsQuirkContainingBlockHeight(const nsHTMLReflowState* rs)
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{
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nsIAtom* frameType = rs->frame->GetType();
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if (nsGkAtoms::blockFrame == frameType ||
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#ifdef MOZ_XUL
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nsGkAtoms::XULLabelFrame == frameType ||
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#endif
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nsGkAtoms::scrollFrame == frameType) {
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// Note: This next condition could change due to a style change,
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// but that would cause a style reflow anyway, which means we're ok.
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if (NS_AUTOHEIGHT == rs->ComputedHeight()) {
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if (!rs->frame->GetStyleDisplay()->IsAbsolutelyPositioned()) {
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return PR_FALSE;
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}
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}
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}
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return PR_TRUE;
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}
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void
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nsHTMLReflowState::InitResizeFlags(nsPresContext* aPresContext)
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{
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mFlags.mHResize = !(frame->GetStateBits() & NS_FRAME_IS_DIRTY) &&
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frame->GetSize().width !=
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mComputedWidth + mComputedBorderPadding.LeftRight();
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// XXX Should we really need to null check mCBReflowState? (We do for
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// at least nsBoxFrame).
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if (IS_TABLE_CELL(frame->GetType()) &&
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(mFlags.mSpecialHeightReflow ||
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(frame->GetFirstInFlow()->GetStateBits() &
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NS_TABLE_CELL_HAD_SPECIAL_REFLOW)) &&
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(frame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_HEIGHT)) {
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// Need to set the bit on the cell so that
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// mCBReflowState->mFlags.mVResize is set correctly below when
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// reflowing descendant.
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mFlags.mVResize = PR_TRUE;
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} else if (mCBReflowState && !frame->IsContainingBlock()) {
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// XXX Is this problematic for relatively positioned inlines acting
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// as containing block for absolutely positioned elements?
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mFlags.mVResize = mCBReflowState->mFlags.mVResize;
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} else if (mComputedHeight == NS_AUTOHEIGHT) {
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if (eCompatibility_NavQuirks == aPresContext->CompatibilityMode() &&
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mCBReflowState) {
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mFlags.mVResize = mCBReflowState->mFlags.mVResize;
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} else {
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mFlags.mVResize = mFlags.mHResize || NS_SUBTREE_DIRTY(frame);
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}
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} else {
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// not 'auto' height
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mFlags.mVResize = frame->GetSize().height !=
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mComputedHeight + mComputedBorderPadding.TopBottom();
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}
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PRBool dependsOnCBHeight =
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mStylePosition->mHeight.GetUnit() == eStyleUnit_Percent ||
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mStylePosition->mMinHeight.GetUnit() == eStyleUnit_Percent ||
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mStylePosition->mMaxHeight.GetUnit() == eStyleUnit_Percent ||
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mStylePosition->mOffset.GetTopUnit() == eStyleUnit_Percent ||
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mStylePosition->mOffset.GetBottomUnit() != eStyleUnit_Auto ||
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frame->IsBoxFrame() ||
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(mStylePosition->mHeight.GetUnit() == eStyleUnit_Auto &&
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frame->GetIntrinsicSize().height.GetUnit() == eStyleUnit_Percent);
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if (mStyleText->mLineHeight.GetUnit() == eStyleUnit_Enumerated) {
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NS_ASSERTION(mStyleText->mLineHeight.GetIntValue() ==
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NS_STYLE_LINE_HEIGHT_BLOCK_HEIGHT,
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"bad line-height value");
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// line-height depends on block height
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frame->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
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// but only on containing blocks if this frame is not a suitable block
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dependsOnCBHeight |= !frame->IsContainingBlock();
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}
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// If we're the descendant of a table cell that performs special height
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// reflows and we could be the child that requires them, always set
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// the vertical resize in case this is the first pass before the
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// special height reflow. However, don't do this if it actually is
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// the special height reflow, since in that case it will already be
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// set correctly above if we need it set.
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if (!mFlags.mVResize && mCBReflowState &&
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(IS_TABLE_CELL(mCBReflowState->frame->GetType()) ||
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mCBReflowState->mFlags.mHeightDependsOnAncestorCell) &&
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!mCBReflowState->mFlags.mSpecialHeightReflow &&
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dependsOnCBHeight) {
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mFlags.mVResize = PR_TRUE;
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mFlags.mHeightDependsOnAncestorCell = PR_TRUE;
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}
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// Set NS_FRAME_CONTAINS_RELATIVE_HEIGHT if it's needed.
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// It would be nice to check that |mComputedHeight != NS_AUTOHEIGHT|
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// &&ed with the percentage height check. However, this doesn't get
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// along with table special height reflows, since a special height
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// reflow (a quirk that makes such percentage heights work on children
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// of table cells) can cause not just a single percentage height to
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// become fixed, but an entire descendant chain of percentage heights
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// to become fixed.
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if (dependsOnCBHeight && mCBReflowState) {
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const nsHTMLReflowState *rs = this;
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PRBool hitCBReflowState = PR_FALSE;
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do {
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rs = rs->parentReflowState;
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if (!rs) {
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break;
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}
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if (rs->frame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_HEIGHT)
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break; // no need to go further
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rs->frame->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
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// Keep track of whether we've hit the containing block, because
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// we need to go at least that far.
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if (rs == mCBReflowState) {
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hitCBReflowState = PR_TRUE;
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}
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} while (!hitCBReflowState ||
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(eCompatibility_NavQuirks == aPresContext->CompatibilityMode() &&
|
|
!IsQuirkContainingBlockHeight(rs)));
|
|
// Note: We actually don't need to set the
|
|
// NS_FRAME_CONTAINS_RELATIVE_HEIGHT bit for the cases
|
|
// where we hit the early break statements in
|
|
// CalcQuirkContainingBlockHeight. But it doesn't hurt
|
|
// us to set the bit in these cases.
|
|
|
|
}
|
|
if (frame->GetStateBits() & NS_FRAME_IS_DIRTY) {
|
|
// If we're reflowing everything, then we'll find out if we need
|
|
// to re-set this.
|
|
frame->RemoveStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
|
|
}
|
|
}
|
|
|
|
/* static */
|
|
nscoord
|
|
nsHTMLReflowState::GetContainingBlockContentWidth(const nsHTMLReflowState* aReflowState)
|
|
{
|
|
const nsHTMLReflowState* rs = aReflowState->mCBReflowState;
|
|
if (!rs)
|
|
return 0;
|
|
return rs->mComputedWidth;
|
|
}
|
|
|
|
/* static */
|
|
nsIFrame*
|
|
nsHTMLReflowState::GetContainingBlockFor(const nsIFrame* aFrame)
|
|
{
|
|
NS_PRECONDITION(aFrame, "Must have frame to work with");
|
|
nsIFrame* container = aFrame->GetParent();
|
|
if (aFrame->GetStyleDisplay()->IsAbsolutelyPositioned()) {
|
|
// Absolutely positioned frames are just kids of their containing
|
|
// blocks (which may happen to be inlines).
|
|
return container;
|
|
}
|
|
while (container && !container->IsContainingBlock()) {
|
|
container = container->GetParent();
|
|
}
|
|
return container;
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::InitFrameType()
|
|
{
|
|
const nsStyleDisplay *disp = mStyleDisplay;
|
|
nsCSSFrameType frameType;
|
|
|
|
// Section 9.7 of the CSS2 spec indicates that absolute position
|
|
// takes precedence over float which takes precedence over display.
|
|
// XXXldb nsRuleNode::ComputeDisplayData should take care of this, right?
|
|
// Make sure the frame was actually moved out of the flow, and don't
|
|
|
|
// just assume what the style says, because we might not have had a
|
|
// useful float/absolute containing block
|
|
nsIFrame* frameToTest =
|
|
frame->GetType() == nsGkAtoms::tableFrame ? frame->GetParent() : frame;
|
|
NS_ASSERTION(frameToTest->GetStyleDisplay()->IsAbsolutelyPositioned() ==
|
|
disp->IsAbsolutelyPositioned(),
|
|
"Unexpected position style");
|
|
NS_ASSERTION(frameToTest->GetStyleDisplay()->IsFloating() ==
|
|
disp->IsFloating(), "Unexpected float style");
|
|
if (frameToTest->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
|
|
if (disp->IsAbsolutelyPositioned()) {
|
|
frameType = NS_CSS_FRAME_TYPE_ABSOLUTE;
|
|
//XXXfr hack for making frames behave properly when in overflow container lists
|
|
// see bug 154892; need to revisit later
|
|
if (frameToTest->GetPrevInFlow())
|
|
frameType = NS_CSS_FRAME_TYPE_BLOCK;
|
|
}
|
|
else if (disp->IsFloating()) {
|
|
frameType = NS_CSS_FRAME_TYPE_FLOATING;
|
|
} else {
|
|
NS_ASSERTION(disp->mDisplay == NS_STYLE_DISPLAY_POPUP,
|
|
"unknown out of flow frame type");
|
|
frameType = NS_CSS_FRAME_TYPE_UNKNOWN;
|
|
}
|
|
}
|
|
else {
|
|
switch (disp->mDisplay) {
|
|
case NS_STYLE_DISPLAY_BLOCK:
|
|
case NS_STYLE_DISPLAY_LIST_ITEM:
|
|
case NS_STYLE_DISPLAY_TABLE:
|
|
case NS_STYLE_DISPLAY_TABLE_CAPTION:
|
|
frameType = NS_CSS_FRAME_TYPE_BLOCK;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_INLINE:
|
|
case NS_STYLE_DISPLAY_INLINE_BLOCK:
|
|
case NS_STYLE_DISPLAY_MARKER:
|
|
case NS_STYLE_DISPLAY_INLINE_TABLE:
|
|
case NS_STYLE_DISPLAY_INLINE_BOX:
|
|
case NS_STYLE_DISPLAY_INLINE_GRID:
|
|
case NS_STYLE_DISPLAY_INLINE_STACK:
|
|
frameType = NS_CSS_FRAME_TYPE_INLINE;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_RUN_IN:
|
|
case NS_STYLE_DISPLAY_COMPACT:
|
|
// XXX need to look ahead at the frame's sibling
|
|
frameType = NS_CSS_FRAME_TYPE_BLOCK;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_TABLE_CELL:
|
|
case NS_STYLE_DISPLAY_TABLE_ROW_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_COLUMN:
|
|
case NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_HEADER_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_FOOTER_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_ROW:
|
|
frameType = NS_CSS_FRAME_TYPE_INTERNAL_TABLE;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_NONE:
|
|
default:
|
|
frameType = NS_CSS_FRAME_TYPE_UNKNOWN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// See if the frame is replaced
|
|
if (frame->IsFrameOfType(nsIFrame::eReplacedContainsBlock)) {
|
|
frameType = NS_FRAME_REPLACED_CONTAINS_BLOCK(frameType);
|
|
} else if (frame->IsFrameOfType(nsIFrame::eReplaced)) {
|
|
frameType = NS_FRAME_REPLACED(frameType);
|
|
}
|
|
|
|
mFrameType = frameType;
|
|
}
|
|
|
|
static void
|
|
nsPointDtor(void *aFrame, nsIAtom *aPropertyName,
|
|
void *aPropertyValue, void *aDtorData)
|
|
{
|
|
nsPoint *point = static_cast<nsPoint*>(aPropertyValue);
|
|
delete point;
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeRelativeOffsets(const nsHTMLReflowState* cbrs,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
nsPresContext* aPresContext)
|
|
{
|
|
// Compute the 'left' and 'right' values. 'Left' moves the boxes to the right,
|
|
// and 'right' moves the boxes to the left. The computed values are always:
|
|
// left=-right
|
|
PRBool leftIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit();
|
|
PRBool rightIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit();
|
|
|
|
// Check for percentage based values and an unconstrained containing
|
|
// block width. Treat them like 'auto'
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetLeftUnit()) {
|
|
leftIsAuto = PR_TRUE;
|
|
}
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetRightUnit()) {
|
|
rightIsAuto = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
// If neither 'left' not 'right' are auto, then we're over-constrained and
|
|
// we ignore one of them
|
|
if (!leftIsAuto && !rightIsAuto) {
|
|
if (mCBReflowState &&
|
|
NS_STYLE_DIRECTION_RTL == mCBReflowState->mStyleVisibility->mDirection) {
|
|
leftIsAuto = PR_TRUE;
|
|
} else {
|
|
rightIsAuto = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
if (leftIsAuto) {
|
|
if (rightIsAuto) {
|
|
// If both are 'auto' (their initial values), the computed values are 0
|
|
mComputedOffsets.left = mComputedOffsets.right = 0;
|
|
} else {
|
|
// 'Right' isn't 'auto' so compute its value
|
|
mComputedOffsets.right = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
mStylePosition->mOffset.GetRight());
|
|
|
|
// Computed value for 'left' is minus the value of 'right'
|
|
mComputedOffsets.left = -mComputedOffsets.right;
|
|
}
|
|
|
|
} else {
|
|
NS_ASSERTION(rightIsAuto, "unexpected specified constraint");
|
|
|
|
// 'Left' isn't 'auto' so compute its value
|
|
mComputedOffsets.left = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
mStylePosition->mOffset.GetLeft());
|
|
|
|
// Computed value for 'right' is minus the value of 'left'
|
|
mComputedOffsets.right = -mComputedOffsets.left;
|
|
}
|
|
|
|
// Compute the 'top' and 'bottom' values. The 'top' and 'bottom' properties
|
|
// move relatively positioned elements up and down. They also must be each
|
|
// other's negative
|
|
PRBool topIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit();
|
|
PRBool bottomIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit();
|
|
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if (NS_AUTOHEIGHT == aContainingBlockHeight) {
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetTopUnit()) {
|
|
topIsAuto = PR_TRUE;
|
|
}
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetBottomUnit()) {
|
|
bottomIsAuto = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
// If neither is 'auto', 'bottom' is ignored
|
|
if (!topIsAuto && !bottomIsAuto) {
|
|
bottomIsAuto = PR_TRUE;
|
|
}
|
|
|
|
if (topIsAuto) {
|
|
if (bottomIsAuto) {
|
|
// If both are 'auto' (their initial values), the computed values are 0
|
|
mComputedOffsets.top = mComputedOffsets.bottom = 0;
|
|
} else {
|
|
// 'Bottom' isn't 'auto' so compute its value
|
|
mComputedOffsets.bottom = nsLayoutUtils::
|
|
ComputeHeightDependentValue(aContainingBlockHeight,
|
|
mStylePosition->mOffset.GetBottom());
|
|
|
|
// Computed value for 'top' is minus the value of 'bottom'
|
|
mComputedOffsets.top = -mComputedOffsets.bottom;
|
|
}
|
|
|
|
} else {
|
|
NS_ASSERTION(bottomIsAuto, "unexpected specified constraint");
|
|
|
|
// 'Top' isn't 'auto' so compute its value
|
|
mComputedOffsets.top = nsLayoutUtils::
|
|
ComputeHeightDependentValue(aContainingBlockHeight,
|
|
mStylePosition->mOffset.GetTop());
|
|
|
|
// Computed value for 'bottom' is minus the value of 'top'
|
|
mComputedOffsets.bottom = -mComputedOffsets.top;
|
|
}
|
|
|
|
// Store the offset
|
|
nsPropertyTable* propTable = aPresContext->PropertyTable();
|
|
nsPoint* offsets = static_cast<nsPoint*>
|
|
(propTable->GetProperty(frame, nsGkAtoms::computedOffsetProperty));
|
|
if (offsets)
|
|
offsets->MoveTo(mComputedOffsets.left, mComputedOffsets.top);
|
|
else {
|
|
offsets = new nsPoint(mComputedOffsets.left, mComputedOffsets.top);
|
|
if (offsets)
|
|
propTable->SetProperty(frame, nsGkAtoms::computedOffsetProperty,
|
|
offsets, nsPointDtor, nsnull);
|
|
}
|
|
}
|
|
|
|
inline PRBool
|
|
IsAnonBlockPseudo(nsIAtom *aPseudo)
|
|
{
|
|
return aPseudo == nsCSSAnonBoxes::mozAnonymousBlock ||
|
|
aPseudo == nsCSSAnonBoxes::mozAnonymousPositionedBlock;
|
|
}
|
|
|
|
nsIFrame*
|
|
nsHTMLReflowState::GetHypotheticalBoxContainer(nsIFrame* aFrame,
|
|
nscoord& aCBLeftEdge,
|
|
nscoord& aCBWidth)
|
|
{
|
|
do {
|
|
aFrame = aFrame->GetParent();
|
|
NS_ASSERTION(aFrame, "Must find containing block somewhere");
|
|
} while (!(aFrame->IsContainingBlock() ||
|
|
(aFrame->IsFrameOfType(nsIFrame::eBlockFrame) &&
|
|
IsAnonBlockPseudo(aFrame->GetStyleContext()->GetPseudoType()))));
|
|
|
|
NS_ASSERTION(aFrame != frame, "How did that happen?");
|
|
|
|
/* Now aFrame is the containing block we want */
|
|
|
|
/* Check whether the containing block is currently being reflowed.
|
|
If so, use the info from the reflow state. */
|
|
const nsHTMLReflowState* state;
|
|
if (aFrame->GetStateBits() & NS_FRAME_IN_REFLOW) {
|
|
for (state = parentReflowState; state && state->frame != aFrame;
|
|
state = state->parentReflowState) {
|
|
/* do nothing */
|
|
}
|
|
} else {
|
|
state = nsnull;
|
|
}
|
|
|
|
if (state) {
|
|
aCBLeftEdge = state->mComputedBorderPadding.left;
|
|
aCBWidth = state->mComputedWidth;
|
|
} else {
|
|
/* Didn't find a reflow state for aFrame. Just compute the information we
|
|
want, on the assumption that aFrame already knows its size. This really
|
|
ought to be true by now. */
|
|
NS_ASSERTION(!(aFrame->GetStateBits() & NS_FRAME_IN_REFLOW),
|
|
"aFrame shouldn't be in reflow; we'll lie if it is");
|
|
nsMargin borderPadding = aFrame->GetUsedBorderAndPadding();
|
|
aCBLeftEdge = borderPadding.left;
|
|
aCBWidth = aFrame->GetSize().width - borderPadding.LeftRight();
|
|
}
|
|
|
|
return aFrame;
|
|
}
|
|
|
|
static nsIFrame*
|
|
GetNearestContainingBlock(nsIFrame *aFrame)
|
|
{
|
|
nsIFrame *cb = aFrame;
|
|
do {
|
|
cb = cb->GetParent();
|
|
} while (!cb->IsContainingBlock());
|
|
return cb;
|
|
}
|
|
|
|
// When determining the hypothetical box that would have been if the element
|
|
// had been in the flow we may not be able to exactly determine both the left
|
|
// and right edges. For example, if the element is a non-replaced inline-level
|
|
// element we would have to reflow it in order to determine it desired width.
|
|
// In that case depending on the progression direction either the left or
|
|
// right edge would be marked as not being exact
|
|
struct nsHypotheticalBox {
|
|
// offsets from left edge of containing block (which is a padding edge)
|
|
nscoord mLeft, mRight;
|
|
// offset from top edge of containing block (which is a padding edge)
|
|
nscoord mTop;
|
|
#ifdef DEBUG
|
|
PRPackedBool mLeftIsExact, mRightIsExact;
|
|
#endif
|
|
|
|
nsHypotheticalBox() {
|
|
#ifdef DEBUG
|
|
mLeftIsExact = mRightIsExact = PR_FALSE;
|
|
#endif
|
|
}
|
|
};
|
|
|
|
static PRBool
|
|
GetIntrinsicSizeFor(nsIFrame* aFrame, nsSize& aIntrinsicSize)
|
|
{
|
|
// See if it is an image frame
|
|
PRBool result = PR_FALSE;
|
|
|
|
// Currently the only type of replaced frame that we can get the intrinsic
|
|
// size for is an image frame
|
|
// XXX We should add back the GetReflowMetrics() function and one of the
|
|
// things should be the intrinsic size...
|
|
if (aFrame->GetType() == nsGkAtoms::imageFrame) {
|
|
nsImageFrame* imageFrame = (nsImageFrame*)aFrame;
|
|
|
|
imageFrame->GetIntrinsicImageSize(aIntrinsicSize);
|
|
result = (aIntrinsicSize != nsSize(0, 0));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* aInsideBoxSizing returns the part of the horizontal padding, border,
|
|
* and margin that goes inside the edge given by -moz-box-sizing;
|
|
* aOutsideBoxSizing returns the rest.
|
|
*/
|
|
void
|
|
nsHTMLReflowState::CalculateHorizBorderPaddingMargin(
|
|
nscoord aContainingBlockWidth,
|
|
nscoord* aInsideBoxSizing,
|
|
nscoord* aOutsideBoxSizing)
|
|
{
|
|
const nsMargin& border = mStyleBorder->GetActualBorder();
|
|
nsMargin padding, margin;
|
|
|
|
// See if the style system can provide us the padding directly
|
|
if (!mStylePadding->GetPadding(padding)) {
|
|
// We have to compute the left and right values
|
|
padding.left = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
mStylePadding->mPadding.GetLeft());
|
|
padding.right = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
mStylePadding->mPadding.GetRight());
|
|
}
|
|
|
|
// See if the style system can provide us the margin directly
|
|
if (!mStyleMargin->GetMargin(margin)) {
|
|
// We have to compute the left and right values
|
|
if (eStyleUnit_Auto == mStyleMargin->mMargin.GetLeftUnit()) {
|
|
// XXX FIXME (or does CalculateBlockSideMargins do this?)
|
|
margin.left = 0; // just ignore
|
|
} else {
|
|
margin.left = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
mStyleMargin->mMargin.GetLeft());
|
|
}
|
|
if (eStyleUnit_Auto == mStyleMargin->mMargin.GetRightUnit()) {
|
|
// XXX FIXME (or does CalculateBlockSideMargins do this?)
|
|
margin.right = 0; // just ignore
|
|
} else {
|
|
margin.right = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
mStyleMargin->mMargin.GetRight());
|
|
}
|
|
}
|
|
|
|
nscoord outside =
|
|
padding.LeftRight() + border.LeftRight() + margin.LeftRight();
|
|
nscoord inside = 0;
|
|
switch (mStylePosition->mBoxSizing) {
|
|
case NS_STYLE_BOX_SIZING_BORDER:
|
|
inside += border.LeftRight();
|
|
// fall through
|
|
case NS_STYLE_BOX_SIZING_PADDING:
|
|
inside += padding.LeftRight();
|
|
}
|
|
outside -= inside;
|
|
*aInsideBoxSizing = inside;
|
|
*aOutsideBoxSizing = outside;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Returns PR_TRUE iff a pre-order traversal of the normal child
|
|
* frames rooted at aFrame finds no non-empty frame before aDescendant.
|
|
*/
|
|
static PRBool AreAllEarlierInFlowFramesEmpty(nsIFrame* aFrame,
|
|
nsIFrame* aDescendant, PRBool* aFound) {
|
|
if (aFrame == aDescendant) {
|
|
*aFound = PR_TRUE;
|
|
return PR_TRUE;
|
|
}
|
|
if (!aFrame->IsSelfEmpty()) {
|
|
*aFound = PR_FALSE;
|
|
return PR_FALSE;
|
|
}
|
|
for (nsIFrame* f = aFrame->GetFirstChild(nsnull); f; f = f->GetNextSibling()) {
|
|
PRBool allEmpty = AreAllEarlierInFlowFramesEmpty(f, aDescendant, aFound);
|
|
if (*aFound || !allEmpty) {
|
|
return allEmpty;
|
|
}
|
|
}
|
|
*aFound = PR_FALSE;
|
|
return PR_TRUE;
|
|
}
|
|
|
|
// Calculate the hypothetical box that the element would have if it were in
|
|
// the flow. The values returned are relative to the padding edge of the
|
|
// absolute containing block
|
|
// aContainingBlock is the placeholder's containing block (XXX rename it?)
|
|
// cbrs->frame is the actual containing block
|
|
void
|
|
nsHTMLReflowState::CalculateHypotheticalBox(nsPresContext* aPresContext,
|
|
nsIFrame* aPlaceholderFrame,
|
|
nsIFrame* aContainingBlock,
|
|
nscoord aBlockLeftContentEdge,
|
|
nscoord aBlockContentWidth,
|
|
const nsHTMLReflowState* cbrs,
|
|
nsHypotheticalBox& aHypotheticalBox)
|
|
{
|
|
NS_ASSERTION(mStyleDisplay->mOriginalDisplay != NS_STYLE_DISPLAY_NONE,
|
|
"mOriginalDisplay has not been properly initialized");
|
|
|
|
// If it's a replaced element and it has a 'auto' value for 'width', see if we
|
|
// can get the intrinsic size. This will allow us to exactly determine both the
|
|
// left and right edges
|
|
PRBool isAutoWidth = mStylePosition->mWidth.GetUnit() == eStyleUnit_Auto;
|
|
nsSize intrinsicSize;
|
|
PRBool knowIntrinsicSize = PR_FALSE;
|
|
if (NS_FRAME_IS_REPLACED(mFrameType) && isAutoWidth) {
|
|
// See if we can get the intrinsic size of the element
|
|
knowIntrinsicSize = GetIntrinsicSizeFor(frame, intrinsicSize);
|
|
}
|
|
|
|
// See if we can calculate what the box width would have been if the
|
|
// element had been in the flow
|
|
nscoord boxWidth;
|
|
PRBool knowBoxWidth = PR_FALSE;
|
|
if ((NS_STYLE_DISPLAY_INLINE == mStyleDisplay->mOriginalDisplay) &&
|
|
!NS_FRAME_IS_REPLACED(mFrameType)) {
|
|
// For non-replaced inline-level elements the 'width' property doesn't apply,
|
|
// so we don't know what the width would have been without reflowing it
|
|
|
|
} else {
|
|
// It's either a replaced inline-level element or a block-level element
|
|
|
|
// Determine the total amount of horizontal border/padding/margin that
|
|
// the element would have had if it had been in the flow. Note that we
|
|
// ignore any 'auto' and 'inherit' values
|
|
nscoord insideBoxSizing, outsideBoxSizing;
|
|
CalculateHorizBorderPaddingMargin(aBlockContentWidth,
|
|
&insideBoxSizing, &outsideBoxSizing);
|
|
|
|
if (NS_FRAME_IS_REPLACED(mFrameType) && isAutoWidth) {
|
|
// It's a replaced element with an 'auto' width so the box width is
|
|
// its intrinsic size plus any border/padding/margin
|
|
if (knowIntrinsicSize) {
|
|
boxWidth = intrinsicSize.width + outsideBoxSizing + insideBoxSizing;
|
|
knowBoxWidth = PR_TRUE;
|
|
}
|
|
|
|
} else if (isAutoWidth) {
|
|
// The box width is the containing block width
|
|
boxWidth = aBlockContentWidth;
|
|
knowBoxWidth = PR_TRUE;
|
|
|
|
} else {
|
|
// We need to compute it. It's important we do this, because if it's
|
|
// percentage based this computed value may be different from the computed
|
|
// value calculated using the absolute containing block width
|
|
boxWidth = ComputeWidthValue(aBlockContentWidth,
|
|
insideBoxSizing, outsideBoxSizing,
|
|
mStylePosition->mWidth) +
|
|
insideBoxSizing + outsideBoxSizing;
|
|
knowBoxWidth = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
// Get the 'direction' of the block
|
|
const nsStyleVisibility* blockVis = aContainingBlock->GetStyleVisibility();
|
|
|
|
// Get the placeholder x-offset and y-offset in the coordinate
|
|
// space of the block frame that contains it
|
|
// XXXbz the placeholder is not fully reflowed yet if our containing block is
|
|
// relatively positioned...
|
|
nsPoint placeholderOffset = aPlaceholderFrame->GetOffsetTo(aContainingBlock);
|
|
|
|
// First, determine the hypothetical box's mTop
|
|
nsBlockFrame* blockFrame = nsLayoutUtils::GetAsBlock(aContainingBlock);
|
|
if (blockFrame) {
|
|
PRBool isValid;
|
|
nsBlockInFlowLineIterator iter(blockFrame, aPlaceholderFrame, &isValid);
|
|
NS_ASSERTION(isValid, "Can't find placeholder!");
|
|
NS_ASSERTION(iter.GetContainer() == blockFrame, "Found placeholder in wrong block!");
|
|
nsBlockFrame::line_iterator lineBox = iter.GetLine();
|
|
|
|
// How we determine the hypothetical box depends on whether the element
|
|
// would have been inline-level or block-level
|
|
if (NS_STYLE_DISPLAY_INLINE == mStyleDisplay->mOriginalDisplay) {
|
|
// Use the top of the inline box which the placeholder lives in as the
|
|
// hypothetical box's top.
|
|
aHypotheticalBox.mTop = lineBox->mBounds.y;
|
|
} else {
|
|
// The element would have been block-level which means it would be below
|
|
// the line containing the placeholder frame, unless all the frames
|
|
// before it are empty. In that case, it would have been just before
|
|
// this line.
|
|
// XXXbz the line box is not fully reflowed yet if our containing block is
|
|
// relatively positioned...
|
|
if (lineBox != iter.End()) {
|
|
nsIFrame * firstFrame = lineBox->mFirstChild;
|
|
PRBool found = PR_FALSE;
|
|
PRBool allEmpty = PR_TRUE;
|
|
while (firstFrame) { // See bug 223064
|
|
allEmpty = AreAllEarlierInFlowFramesEmpty(firstFrame,
|
|
aPlaceholderFrame, &found);
|
|
if (found || !allEmpty)
|
|
break;
|
|
firstFrame = firstFrame->GetNextSibling();
|
|
}
|
|
NS_ASSERTION(firstFrame, "Couldn't find placeholder!");
|
|
|
|
if (allEmpty) {
|
|
// The top of the hypothetical box is the top of the line containing
|
|
// the placeholder, since there is nothing in the line before our
|
|
// placeholder except empty frames.
|
|
aHypotheticalBox.mTop = lineBox->mBounds.y;
|
|
} else {
|
|
// The top of the hypothetical box is just below the line containing
|
|
// the placeholder.
|
|
aHypotheticalBox.mTop = lineBox->mBounds.YMost();
|
|
}
|
|
} else {
|
|
// Just use the placeholder's y-offset
|
|
aHypotheticalBox.mTop = placeholderOffset.y;
|
|
}
|
|
}
|
|
} else {
|
|
// The containing block is not a block, so it's probably something
|
|
// like a XUL box, etc.
|
|
// Just use the placeholder's y-offset
|
|
aHypotheticalBox.mTop = placeholderOffset.y;
|
|
}
|
|
|
|
// Second, determine the hypothetical box's mLeft & mRight
|
|
// To determine the left and right offsets we need to look at the block's 'direction'
|
|
if (NS_STYLE_DIRECTION_LTR == blockVis->mDirection) {
|
|
// How we determine the hypothetical box depends on whether the element
|
|
// would have been inline-level or block-level
|
|
if (NS_STYLE_DISPLAY_INLINE == mStyleDisplay->mOriginalDisplay) {
|
|
// The placeholder represents the left edge of the hypothetical box
|
|
aHypotheticalBox.mLeft = placeholderOffset.x;
|
|
} else {
|
|
aHypotheticalBox.mLeft = aBlockLeftContentEdge;
|
|
}
|
|
#ifdef DEBUG
|
|
aHypotheticalBox.mLeftIsExact = PR_TRUE;
|
|
#endif
|
|
|
|
if (knowBoxWidth) {
|
|
aHypotheticalBox.mRight = aHypotheticalBox.mLeft + boxWidth;
|
|
#ifdef DEBUG
|
|
aHypotheticalBox.mRightIsExact = PR_TRUE;
|
|
#endif
|
|
} else {
|
|
// We can't compute the right edge because we don't know the desired
|
|
// width. So instead use the right content edge of the block parent,
|
|
// but remember it's not exact
|
|
aHypotheticalBox.mRight = aBlockLeftContentEdge + aBlockContentWidth;
|
|
#ifdef DEBUG
|
|
aHypotheticalBox.mRightIsExact = PR_FALSE;
|
|
#endif
|
|
}
|
|
|
|
} else {
|
|
// The placeholder represents the right edge of the hypothetical box
|
|
if (NS_STYLE_DISPLAY_INLINE == mStyleDisplay->mOriginalDisplay) {
|
|
aHypotheticalBox.mRight = placeholderOffset.x;
|
|
} else {
|
|
aHypotheticalBox.mRight = aBlockLeftContentEdge + aBlockContentWidth;
|
|
}
|
|
#ifdef DEBUG
|
|
aHypotheticalBox.mRightIsExact = PR_TRUE;
|
|
#endif
|
|
|
|
if (knowBoxWidth) {
|
|
aHypotheticalBox.mLeft = aHypotheticalBox.mRight - boxWidth;
|
|
#ifdef DEBUG
|
|
aHypotheticalBox.mLeftIsExact = PR_TRUE;
|
|
#endif
|
|
} else {
|
|
// We can't compute the left edge because we don't know the desired
|
|
// width. So instead use the left content edge of the block parent,
|
|
// but remember it's not exact
|
|
aHypotheticalBox.mLeft = aBlockLeftContentEdge;
|
|
#ifdef DEBUG
|
|
aHypotheticalBox.mLeftIsExact = PR_FALSE;
|
|
#endif
|
|
}
|
|
|
|
}
|
|
|
|
// The current coordinate space is that of the nearest block to the placeholder.
|
|
// Convert to the coordinate space of the absolute containing block
|
|
// One weird thing here is that for fixed-positioned elements we want to do
|
|
// the conversion incorrectly; specifically we want to ignore any scrolling
|
|
// that may have happened;
|
|
nsPoint cbOffset;
|
|
if (mStyleDisplay->mPosition == NS_STYLE_POSITION_FIXED &&
|
|
// Exclude cases inside -moz-transform where fixed is like absolute.
|
|
nsLayoutUtils::IsReallyFixedPos(frame)) {
|
|
// In this case, cbrs->frame will always be an ancestor of
|
|
// aContainingBlock, so can just walk our way up the frame tree.
|
|
// Make sure to not add positions of frames whose parent is a
|
|
// scrollFrame, since we're doing fixed positioning, which assumes
|
|
// everything is scrolled to (0,0).
|
|
cbOffset.MoveTo(0, 0);
|
|
do {
|
|
NS_ASSERTION(aContainingBlock,
|
|
"Should hit cbrs->frame before we run off the frame tree!");
|
|
cbOffset += aContainingBlock->GetPositionIgnoringScrolling();
|
|
aContainingBlock = aContainingBlock->GetParent();
|
|
} while (aContainingBlock != cbrs->frame);
|
|
} else {
|
|
// XXXldb We need to either ignore scrolling for the absolute
|
|
// positioning case too (and take the incompatibility) or figure out
|
|
// how to make these positioned elements actually *move* when we
|
|
// scroll, and thus avoid the resulting incremental reflow bugs.
|
|
cbOffset = aContainingBlock->GetOffsetTo(cbrs->frame);
|
|
}
|
|
aHypotheticalBox.mLeft += cbOffset.x;
|
|
aHypotheticalBox.mTop += cbOffset.y;
|
|
aHypotheticalBox.mRight += cbOffset.x;
|
|
|
|
// The specified offsets are relative to the absolute containing block's
|
|
// padding edge and our current values are relative to the border edge, so
|
|
// translate.
|
|
nsMargin border = cbrs->mComputedBorderPadding - cbrs->mComputedPadding;
|
|
aHypotheticalBox.mLeft -= border.left;
|
|
aHypotheticalBox.mRight -= border.left;
|
|
aHypotheticalBox.mTop -= border.top;
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::InitAbsoluteConstraints(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState* cbrs,
|
|
nscoord containingBlockWidth,
|
|
nscoord containingBlockHeight)
|
|
{
|
|
NS_PRECONDITION(containingBlockHeight != NS_AUTOHEIGHT,
|
|
"containing block height must be constrained");
|
|
|
|
nsIFrame* outOfFlow =
|
|
frame->GetType() == nsGkAtoms::tableFrame ? frame->GetParent() : frame;
|
|
NS_ASSERTION(outOfFlow->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
|
|
"Why are we here?");
|
|
|
|
// Get the placeholder frame
|
|
nsIFrame* placeholderFrame;
|
|
|
|
aPresContext->PresShell()->GetPlaceholderFrameFor(outOfFlow,
|
|
&placeholderFrame);
|
|
NS_ASSERTION(nsnull != placeholderFrame, "no placeholder frame");
|
|
|
|
// If both 'left' and 'right' are 'auto' or both 'top' and 'bottom' are
|
|
// 'auto', then compute the hypothetical box of where the element would
|
|
// have been if it had been in the flow
|
|
nsHypotheticalBox hypotheticalBox;
|
|
if (((eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit()) &&
|
|
(eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit())) ||
|
|
((eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit()) &&
|
|
(eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit()))) {
|
|
// Find the nearest containing block frame to the placeholder frame,
|
|
// and return its left edge and width.
|
|
nscoord cbLeftEdge, cbWidth;
|
|
nsIFrame* cbFrame = GetHypotheticalBoxContainer(placeholderFrame,
|
|
cbLeftEdge,
|
|
cbWidth);
|
|
|
|
CalculateHypotheticalBox(aPresContext, placeholderFrame, cbFrame,
|
|
cbLeftEdge, cbWidth, cbrs, hypotheticalBox);
|
|
}
|
|
|
|
// Initialize the 'left' and 'right' computed offsets
|
|
// XXX Handle new 'static-position' value...
|
|
PRBool leftIsAuto = PR_FALSE, rightIsAuto = PR_FALSE;
|
|
if (eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit()) {
|
|
mComputedOffsets.left = 0;
|
|
leftIsAuto = PR_TRUE;
|
|
} else {
|
|
mComputedOffsets.left = nsLayoutUtils::
|
|
ComputeWidthDependentValue(containingBlockWidth,
|
|
mStylePosition->mOffset.GetLeft());
|
|
}
|
|
if (eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit()) {
|
|
mComputedOffsets.right = 0;
|
|
rightIsAuto = PR_TRUE;
|
|
} else {
|
|
mComputedOffsets.right = nsLayoutUtils::
|
|
ComputeWidthDependentValue(containingBlockWidth,
|
|
mStylePosition->mOffset.GetRight());
|
|
}
|
|
|
|
// Use the horizontal component of the hypothetical box in the cases
|
|
// where it's needed.
|
|
if (leftIsAuto && rightIsAuto) {
|
|
// Use the direction of the original ("static-position") containing block
|
|
// to dictate whether 'left' or 'right' is treated like 'static-position'.
|
|
if (NS_STYLE_DIRECTION_LTR == GetNearestContainingBlock(placeholderFrame)
|
|
->GetStyleVisibility()->mDirection) {
|
|
NS_ASSERTION(hypotheticalBox.mLeftIsExact, "should always have "
|
|
"exact value on containing block's start side");
|
|
mComputedOffsets.left = hypotheticalBox.mLeft;
|
|
leftIsAuto = PR_FALSE;
|
|
} else {
|
|
NS_ASSERTION(hypotheticalBox.mRightIsExact, "should always have "
|
|
"exact value on containing block's start side");
|
|
mComputedOffsets.right = containingBlockWidth - hypotheticalBox.mRight;
|
|
rightIsAuto = PR_FALSE;
|
|
}
|
|
}
|
|
|
|
// Initialize the 'top' and 'bottom' computed offsets
|
|
PRBool topIsAuto = PR_FALSE, bottomIsAuto = PR_FALSE;
|
|
if (eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit()) {
|
|
mComputedOffsets.top = 0;
|
|
topIsAuto = PR_TRUE;
|
|
} else {
|
|
mComputedOffsets.top = nsLayoutUtils::
|
|
ComputeHeightDependentValue(containingBlockHeight,
|
|
mStylePosition->mOffset.GetTop());
|
|
}
|
|
if (eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit()) {
|
|
mComputedOffsets.bottom = 0;
|
|
bottomIsAuto = PR_TRUE;
|
|
} else {
|
|
mComputedOffsets.bottom = nsLayoutUtils::
|
|
ComputeHeightDependentValue(containingBlockHeight,
|
|
mStylePosition->mOffset.GetBottom());
|
|
}
|
|
|
|
if (topIsAuto && bottomIsAuto) {
|
|
// Treat 'top' like 'static-position'
|
|
mComputedOffsets.top = hypotheticalBox.mTop;
|
|
topIsAuto = PR_FALSE;
|
|
}
|
|
|
|
PRBool widthIsAuto = eStyleUnit_Auto == mStylePosition->mWidth.GetUnit();
|
|
PRBool heightIsAuto = eStyleUnit_Auto == mStylePosition->mHeight.GetUnit();
|
|
|
|
PRBool shrinkWrap = leftIsAuto || rightIsAuto;
|
|
nsSize size =
|
|
frame->ComputeSize(rendContext,
|
|
nsSize(containingBlockWidth,
|
|
containingBlockHeight),
|
|
containingBlockWidth, // XXX or availableWidth?
|
|
nsSize(mComputedMargin.LeftRight() +
|
|
mComputedOffsets.LeftRight(),
|
|
mComputedMargin.TopBottom() +
|
|
mComputedOffsets.TopBottom()),
|
|
nsSize(mComputedBorderPadding.LeftRight() -
|
|
mComputedPadding.LeftRight(),
|
|
mComputedBorderPadding.TopBottom() -
|
|
mComputedPadding.TopBottom()),
|
|
nsSize(mComputedPadding.LeftRight(),
|
|
mComputedPadding.TopBottom()),
|
|
shrinkWrap);
|
|
mComputedWidth = size.width;
|
|
mComputedHeight = size.height;
|
|
NS_ASSERTION(mComputedWidth >= 0, "Bogus width");
|
|
NS_ASSERTION(mComputedHeight == NS_UNCONSTRAINEDSIZE ||
|
|
mComputedHeight >= 0, "Bogus height");
|
|
|
|
// XXX Now that we have ComputeSize, can we condense many of the
|
|
// branches off of widthIsAuto?
|
|
|
|
if (leftIsAuto) {
|
|
// We know 'right' is not 'auto' anymore thanks to the hypothetical
|
|
// box code above.
|
|
// Solve for 'left'.
|
|
if (widthIsAuto) {
|
|
// XXXldb This, and the corresponding code in
|
|
// nsAbsoluteContainingBlock.cpp, could probably go away now that
|
|
// we always compute widths.
|
|
mComputedOffsets.left = NS_AUTOOFFSET;
|
|
} else {
|
|
mComputedOffsets.left = containingBlockWidth - mComputedMargin.left -
|
|
mComputedBorderPadding.left - mComputedWidth - mComputedBorderPadding.right -
|
|
mComputedMargin.right - mComputedOffsets.right;
|
|
|
|
}
|
|
} else if (rightIsAuto) {
|
|
// We know 'left' is not 'auto' anymore thanks to the hypothetical
|
|
// box code above.
|
|
// Solve for 'right'.
|
|
if (widthIsAuto) {
|
|
// XXXldb This, and the corresponding code in
|
|
// nsAbsoluteContainingBlock.cpp, could probably go away now that
|
|
// we always compute widths.
|
|
mComputedOffsets.right = NS_AUTOOFFSET;
|
|
} else {
|
|
mComputedOffsets.right = containingBlockWidth - mComputedOffsets.left -
|
|
mComputedMargin.left - mComputedBorderPadding.left - mComputedWidth -
|
|
mComputedBorderPadding.right - mComputedMargin.right;
|
|
}
|
|
} else {
|
|
// Neither 'left' nor 'right' is 'auto'. However, the width might
|
|
// still not fill all the available space (even though we didn't
|
|
// shrink-wrap) in case:
|
|
// * width was specified
|
|
// * we're dealing with a replaced element
|
|
// * width was constrained by min-width or max-width.
|
|
|
|
nscoord availMarginSpace = containingBlockWidth -
|
|
mComputedOffsets.LeftRight() -
|
|
mComputedMargin.LeftRight() -
|
|
mComputedBorderPadding.LeftRight() -
|
|
mComputedWidth;
|
|
PRBool marginLeftIsAuto =
|
|
eStyleUnit_Auto == mStyleMargin->mMargin.GetLeftUnit();
|
|
PRBool marginRightIsAuto =
|
|
eStyleUnit_Auto == mStyleMargin->mMargin.GetRightUnit();
|
|
|
|
if (availMarginSpace < 0 ||
|
|
(!marginLeftIsAuto && !marginRightIsAuto)) {
|
|
// We're over-constrained so use the direction of the containing block
|
|
// to dictate which value to ignore. (And note that the spec says to ignore
|
|
// 'left' or 'right' rather than 'margin-left' or 'margin-right'.)
|
|
if (cbrs &&
|
|
NS_STYLE_DIRECTION_RTL == cbrs->mStyleVisibility->mDirection) {
|
|
// Ignore the specified value for 'left'.
|
|
mComputedOffsets.left += availMarginSpace;
|
|
} else {
|
|
// Ignore the specified value for 'right'.
|
|
mComputedOffsets.right += availMarginSpace;
|
|
}
|
|
} else if (marginLeftIsAuto) {
|
|
if (marginRightIsAuto) {
|
|
// Both 'margin-left' and 'margin-right' are 'auto', so they get
|
|
// equal values
|
|
mComputedMargin.left = availMarginSpace / 2;
|
|
mComputedMargin.right = availMarginSpace - mComputedMargin.left;
|
|
} else {
|
|
// Just 'margin-left' is 'auto'
|
|
mComputedMargin.left = availMarginSpace;
|
|
}
|
|
} else {
|
|
// Just 'margin-right' is 'auto'
|
|
mComputedMargin.right = availMarginSpace;
|
|
}
|
|
}
|
|
|
|
if (topIsAuto) {
|
|
// solve for 'top'
|
|
if (heightIsAuto) {
|
|
mComputedOffsets.top = NS_AUTOOFFSET;
|
|
} else {
|
|
mComputedOffsets.top = containingBlockHeight - mComputedMargin.top -
|
|
mComputedBorderPadding.top - mComputedHeight - mComputedBorderPadding.bottom -
|
|
mComputedMargin.bottom - mComputedOffsets.bottom;
|
|
}
|
|
} else if (bottomIsAuto) {
|
|
// solve for 'bottom'
|
|
if (heightIsAuto) {
|
|
mComputedOffsets.bottom = NS_AUTOOFFSET;
|
|
} else {
|
|
mComputedOffsets.bottom = containingBlockHeight - mComputedOffsets.top -
|
|
mComputedMargin.top - mComputedBorderPadding.top - mComputedHeight -
|
|
mComputedBorderPadding.bottom - mComputedMargin.bottom;
|
|
}
|
|
} else {
|
|
// Neither 'top' nor 'bottom' is 'auto'.
|
|
nscoord autoHeight = containingBlockHeight -
|
|
mComputedOffsets.TopBottom() -
|
|
mComputedMargin.TopBottom() -
|
|
mComputedBorderPadding.TopBottom();
|
|
if (autoHeight < 0) {
|
|
autoHeight = 0;
|
|
}
|
|
|
|
if (mComputedHeight == NS_UNCONSTRAINEDSIZE) {
|
|
// For non-replaced elements with 'height' auto, the 'height'
|
|
// fills the remaining space.
|
|
mComputedHeight = autoHeight;
|
|
|
|
// XXX Do these need box-sizing adjustments?
|
|
if (mComputedHeight > mComputedMaxHeight)
|
|
mComputedHeight = mComputedMaxHeight;
|
|
if (mComputedHeight < mComputedMinHeight)
|
|
mComputedHeight = mComputedMinHeight;
|
|
}
|
|
|
|
// The height might still not fill all the available space in case:
|
|
// * height was specified
|
|
// * we're dealing with a replaced element
|
|
// * height was constrained by min-height or max-height.
|
|
nscoord availMarginSpace = autoHeight - mComputedHeight;
|
|
PRBool marginTopIsAuto =
|
|
eStyleUnit_Auto == mStyleMargin->mMargin.GetTopUnit();
|
|
PRBool marginBottomIsAuto =
|
|
eStyleUnit_Auto == mStyleMargin->mMargin.GetBottomUnit();
|
|
|
|
if (availMarginSpace < 0 || (!marginTopIsAuto && !marginBottomIsAuto)) {
|
|
// We're over-constrained so ignore the specified value for
|
|
// 'bottom'. (And note that the spec says to ignore 'bottom'
|
|
// rather than 'margin-bottom'.)
|
|
mComputedOffsets.bottom += availMarginSpace;
|
|
} else if (marginTopIsAuto) {
|
|
if (marginBottomIsAuto) {
|
|
// Both 'margin-top' and 'margin-bottom' are 'auto', so they get
|
|
// equal values
|
|
mComputedMargin.top = availMarginSpace / 2;
|
|
mComputedMargin.bottom = availMarginSpace - mComputedMargin.top;
|
|
} else {
|
|
// Just 'margin-top' is 'auto'
|
|
mComputedMargin.top = availMarginSpace - mComputedMargin.bottom;
|
|
}
|
|
} else {
|
|
// Just 'margin-bottom' is 'auto'
|
|
mComputedMargin.bottom = availMarginSpace - mComputedMargin.top;
|
|
}
|
|
}
|
|
}
|
|
|
|
nscoord
|
|
GetVerticalMarginBorderPadding(const nsHTMLReflowState* aReflowState)
|
|
{
|
|
nscoord result = 0;
|
|
if (!aReflowState) return result;
|
|
|
|
// zero auto margins
|
|
nsMargin margin = aReflowState->mComputedMargin;
|
|
if (NS_AUTOMARGIN == margin.top)
|
|
margin.top = 0;
|
|
if (NS_AUTOMARGIN == margin.bottom)
|
|
margin.bottom = 0;
|
|
|
|
result += margin.top + margin.bottom;
|
|
result += aReflowState->mComputedBorderPadding.top +
|
|
aReflowState->mComputedBorderPadding.bottom;
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Get the height based on the viewport of the containing block specified
|
|
* in aReflowState when the containing block has mComputedHeight == NS_AUTOHEIGHT
|
|
* This will walk up the chain of containing blocks looking for a computed height
|
|
* until it finds the canvas frame, or it encounters a frame that is not a block,
|
|
* area, or scroll frame. This handles compatibility with IE (see bug 85016 and bug 219693)
|
|
*
|
|
* When we encounter scrolledContent block frames, we skip over them, since they are guaranteed to not be useful for computing the containing block.
|
|
*
|
|
* See also IsQuirkContainingBlockHeight.
|
|
*/
|
|
static nscoord
|
|
CalcQuirkContainingBlockHeight(const nsHTMLReflowState* aCBReflowState)
|
|
{
|
|
nsHTMLReflowState* firstAncestorRS = nsnull; // a candidate for html frame
|
|
nsHTMLReflowState* secondAncestorRS = nsnull; // a candidate for body frame
|
|
|
|
// initialize the default to NS_AUTOHEIGHT as this is the containings block
|
|
// computed height when this function is called. It is possible that we
|
|
// don't alter this height especially if we are restricted to one level
|
|
nscoord result = NS_AUTOHEIGHT;
|
|
|
|
const nsHTMLReflowState* rs = aCBReflowState;
|
|
for (; rs; rs = (nsHTMLReflowState *)(rs->parentReflowState)) {
|
|
nsIAtom* frameType = rs->frame->GetType();
|
|
// if the ancestor is auto height then skip it and continue up if it
|
|
// is the first block frame and possibly the body/html
|
|
if (nsGkAtoms::blockFrame == frameType ||
|
|
#ifdef MOZ_XUL
|
|
nsGkAtoms::XULLabelFrame == frameType ||
|
|
#endif
|
|
nsGkAtoms::scrollFrame == frameType) {
|
|
|
|
secondAncestorRS = firstAncestorRS;
|
|
firstAncestorRS = (nsHTMLReflowState*)rs;
|
|
|
|
// If the current frame we're looking at is positioned, we don't want to
|
|
// go any further (see bug 221784). The behavior we want here is: 1) If
|
|
// not auto-height, use this as the percentage base. 2) If auto-height,
|
|
// keep looking, unless the frame is positioned.
|
|
if (NS_AUTOHEIGHT == rs->ComputedHeight()) {
|
|
if (rs->frame->GetStyleDisplay()->IsAbsolutelyPositioned()) {
|
|
break;
|
|
} else {
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
else if (nsGkAtoms::canvasFrame == frameType) {
|
|
// Always continue on to the height calculation
|
|
}
|
|
else if (nsGkAtoms::pageContentFrame == frameType) {
|
|
nsIFrame* prevInFlow = rs->frame->GetPrevInFlow();
|
|
// only use the page content frame for a height basis if it is the first in flow
|
|
if (prevInFlow)
|
|
break;
|
|
}
|
|
else {
|
|
break;
|
|
}
|
|
|
|
// if the ancestor is the page content frame then the percent base is
|
|
// the avail height, otherwise it is the computed height
|
|
result = (nsGkAtoms::pageContentFrame == frameType)
|
|
? rs->availableHeight : rs->ComputedHeight();
|
|
// if unconstrained - don't sutract borders - would result in huge height
|
|
if (NS_AUTOHEIGHT == result) return result;
|
|
|
|
// if we got to the canvas or page content frame, then subtract out
|
|
// margin/border/padding for the BODY and HTML elements
|
|
if ((nsGkAtoms::canvasFrame == frameType) ||
|
|
(nsGkAtoms::pageContentFrame == frameType)) {
|
|
|
|
result -= GetVerticalMarginBorderPadding(firstAncestorRS);
|
|
result -= GetVerticalMarginBorderPadding(secondAncestorRS);
|
|
|
|
#ifdef DEBUG
|
|
// make sure the first ancestor is the HTML and the second is the BODY
|
|
if (firstAncestorRS) {
|
|
nsIContent* frameContent = firstAncestorRS->frame->GetContent();
|
|
if (frameContent) {
|
|
nsIAtom *contentTag = frameContent->Tag();
|
|
NS_ASSERTION(contentTag == nsGkAtoms::html, "First ancestor is not HTML");
|
|
}
|
|
}
|
|
if (secondAncestorRS) {
|
|
nsIContent* frameContent = secondAncestorRS->frame->GetContent();
|
|
if (frameContent) {
|
|
nsIAtom *contentTag = frameContent->Tag();
|
|
NS_ASSERTION(contentTag == nsGkAtoms::body, "Second ancestor is not BODY");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
}
|
|
// if we got to the html frame (a block child of the canvas) ...
|
|
else if (nsGkAtoms::blockFrame == frameType &&
|
|
nsGkAtoms::canvasFrame ==
|
|
rs->parentReflowState->frame->GetType()) {
|
|
// ... then subtract out margin/border/padding for the BODY element
|
|
result -= GetVerticalMarginBorderPadding(secondAncestorRS);
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Make sure not to return a negative height here!
|
|
return NS_MAX(result, 0);
|
|
}
|
|
// Called by InitConstraints() to compute the containing block rectangle for
|
|
// the element. Handles the special logic for absolutely positioned elements
|
|
void
|
|
nsHTMLReflowState::ComputeContainingBlockRectangle(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState* aContainingBlockRS,
|
|
nscoord& aContainingBlockWidth,
|
|
nscoord& aContainingBlockHeight)
|
|
{
|
|
// Unless the element is absolutely positioned, the containing block is
|
|
// formed by the content edge of the nearest block-level ancestor
|
|
aContainingBlockWidth = aContainingBlockRS->mComputedWidth;
|
|
aContainingBlockHeight = aContainingBlockRS->mComputedHeight;
|
|
|
|
if (NS_FRAME_GET_TYPE(mFrameType) == NS_CSS_FRAME_TYPE_ABSOLUTE) {
|
|
// See if the ancestor is block-level or inline-level
|
|
if (NS_FRAME_GET_TYPE(aContainingBlockRS->mFrameType) == NS_CSS_FRAME_TYPE_INLINE) {
|
|
// Base our size on the actual size of the frame. In cases when this is
|
|
// completely bogus (eg initial reflow), this code shouldn't even be
|
|
// called, since the code in nsPositionedInlineFrame::Reflow will pass in
|
|
// the containing block dimensions to our constructor.
|
|
// XXXbz we should be taking the in-flows into account too, but
|
|
// that's very hard.
|
|
nsMargin computedBorder = aContainingBlockRS->mComputedBorderPadding -
|
|
aContainingBlockRS->mComputedPadding;
|
|
aContainingBlockWidth = aContainingBlockRS->frame->GetRect().width -
|
|
computedBorder.LeftRight();;
|
|
NS_ASSERTION(aContainingBlockWidth >= 0,
|
|
"Negative containing block width!");
|
|
aContainingBlockHeight = aContainingBlockRS->frame->GetRect().height -
|
|
computedBorder.TopBottom();
|
|
NS_ASSERTION(aContainingBlockHeight >= 0,
|
|
"Negative containing block height!");
|
|
} else {
|
|
// If the ancestor is block-level, the containing block is formed by the
|
|
// padding edge of the ancestor
|
|
aContainingBlockWidth += aContainingBlockRS->mComputedPadding.LeftRight();
|
|
aContainingBlockHeight += aContainingBlockRS->mComputedPadding.TopBottom();
|
|
}
|
|
} else {
|
|
// an element in quirks mode gets a containing block based on looking for a
|
|
// parent with a non-auto height if the element has a percent height
|
|
if (NS_AUTOHEIGHT == aContainingBlockHeight) {
|
|
if (eCompatibility_NavQuirks == aPresContext->CompatibilityMode() &&
|
|
mStylePosition->mHeight.GetUnit() == eStyleUnit_Percent) {
|
|
aContainingBlockHeight = CalcQuirkContainingBlockHeight(aContainingBlockRS);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Prefs callback to pick up changes
|
|
static int
|
|
PrefsChanged(const char *aPrefName, void *instance)
|
|
{
|
|
sBlinkIsAllowed =
|
|
nsContentUtils::GetBoolPref("browser.blink_allowed", sBlinkIsAllowed);
|
|
|
|
return 0; /* PREF_OK */
|
|
}
|
|
|
|
// Check to see if |text-decoration: blink| is allowed. The first time
|
|
// called, register the callback and then force-load the pref. After that,
|
|
// just use the cached value.
|
|
static PRBool BlinkIsAllowed(void)
|
|
{
|
|
if (!sPrefIsLoaded) {
|
|
// Set up a listener and check the initial value
|
|
nsContentUtils::RegisterPrefCallback("browser.blink_allowed", PrefsChanged,
|
|
nsnull);
|
|
PrefsChanged(nsnull, nsnull);
|
|
sPrefIsLoaded = PR_TRUE;
|
|
}
|
|
return sBlinkIsAllowed;
|
|
}
|
|
|
|
static eNormalLineHeightControl GetNormalLineHeightCalcControl(void)
|
|
{
|
|
if (sNormalLineHeightControl == eUninitialized) {
|
|
// browser.display.normal_lineheight_calc_control is not user
|
|
// changeable, so no need to register callback for it.
|
|
sNormalLineHeightControl =
|
|
static_cast<eNormalLineHeightControl>
|
|
(nsContentUtils::GetIntPref("browser.display.normal_lineheight_calc_control", eNoExternalLeading));
|
|
}
|
|
return sNormalLineHeightControl;
|
|
}
|
|
|
|
static inline PRBool
|
|
IsSideCaption(nsIFrame* aFrame, const nsStyleDisplay* aStyleDisplay)
|
|
{
|
|
if (aStyleDisplay->mDisplay != NS_STYLE_DISPLAY_TABLE_CAPTION)
|
|
return PR_FALSE;
|
|
PRUint8 captionSide = aFrame->GetStyleTableBorder()->mCaptionSide;
|
|
return captionSide == NS_STYLE_CAPTION_SIDE_LEFT ||
|
|
captionSide == NS_STYLE_CAPTION_SIDE_RIGHT;
|
|
}
|
|
|
|
// XXX refactor this code to have methods for each set of properties
|
|
// we are computing: width,height,line-height; margin; offsets
|
|
|
|
void
|
|
nsHTMLReflowState::InitConstraints(nsPresContext* aPresContext,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsMargin* aBorder,
|
|
const nsMargin* aPadding)
|
|
{
|
|
// If this is the root frame, then set the computed width and
|
|
// height equal to the available space
|
|
if (nsnull == parentReflowState) {
|
|
// XXXldb This doesn't mean what it used to!
|
|
InitOffsets(aContainingBlockWidth, aBorder, aPadding);
|
|
// Override mComputedMargin since reflow roots start from the
|
|
// frame's boundary, which is inside the margin.
|
|
mComputedMargin.SizeTo(0, 0, 0, 0);
|
|
mComputedOffsets.SizeTo(0, 0, 0, 0);
|
|
|
|
mComputedWidth = availableWidth - mComputedBorderPadding.LeftRight();
|
|
if (mComputedWidth < 0)
|
|
mComputedWidth = 0;
|
|
if (availableHeight != NS_UNCONSTRAINEDSIZE) {
|
|
mComputedHeight = availableHeight - mComputedBorderPadding.TopBottom();
|
|
if (mComputedHeight < 0)
|
|
mComputedHeight = 0;
|
|
} else {
|
|
mComputedHeight = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
// Get the containing block reflow state
|
|
const nsHTMLReflowState* cbrs = mCBReflowState;
|
|
NS_ASSERTION(nsnull != cbrs, "no containing block");
|
|
|
|
// If we weren't given a containing block width and height, then
|
|
// compute one
|
|
if (aContainingBlockWidth == -1) {
|
|
ComputeContainingBlockRectangle(aPresContext, cbrs, aContainingBlockWidth,
|
|
aContainingBlockHeight);
|
|
}
|
|
|
|
#if 0
|
|
nsFrame::ListTag(stdout, frame); printf(": cb=");
|
|
nsFrame::ListTag(stdout, cbrs->frame); printf(" size=%d,%d\n", aContainingBlockWidth, aContainingBlockHeight);
|
|
#endif
|
|
|
|
// See if the containing block height is based on the size of its
|
|
// content
|
|
nsIAtom* fType;
|
|
if (NS_AUTOHEIGHT == aContainingBlockHeight) {
|
|
// See if the containing block is a cell frame which needs
|
|
// to use the mComputedHeight of the cell instead of what the cell block passed in.
|
|
// XXX It seems like this could lead to bugs with min-height and friends
|
|
if (cbrs->parentReflowState) {
|
|
fType = cbrs->frame->GetType();
|
|
if (IS_TABLE_CELL(fType)) {
|
|
// use the cell's computed height
|
|
aContainingBlockHeight = cbrs->mComputedHeight;
|
|
}
|
|
}
|
|
}
|
|
|
|
InitOffsets(aContainingBlockWidth, aBorder, aPadding);
|
|
|
|
nsStyleUnit heightUnit = mStylePosition->mHeight.GetUnit();
|
|
|
|
// Check for a percentage based height and a containing block height
|
|
// that depends on the content height
|
|
// XXX twiddling heightUnit doesn't help anymore
|
|
if (eStyleUnit_Percent == heightUnit) {
|
|
if (NS_AUTOHEIGHT == aContainingBlockHeight) {
|
|
// this if clause enables %-height on replaced inline frames,
|
|
// such as images. See bug 54119. The else clause "heightUnit = eStyleUnit_Auto;"
|
|
// used to be called exclusively.
|
|
if (NS_FRAME_REPLACED(NS_CSS_FRAME_TYPE_INLINE) == mFrameType ||
|
|
NS_FRAME_REPLACED_CONTAINS_BLOCK(
|
|
NS_CSS_FRAME_TYPE_INLINE) == mFrameType) {
|
|
// Get the containing block reflow state
|
|
NS_ASSERTION(nsnull != cbrs, "no containing block");
|
|
// in quirks mode, get the cb height using the special quirk method
|
|
if (eCompatibility_NavQuirks == aPresContext->CompatibilityMode()) {
|
|
if (!IS_TABLE_CELL(fType)) {
|
|
aContainingBlockHeight = CalcQuirkContainingBlockHeight(cbrs);
|
|
if (aContainingBlockHeight == NS_AUTOHEIGHT) {
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
else {
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
// in standard mode, use the cb height. if it's "auto", as will be the case
|
|
// by default in BODY, use auto height as per CSS2 spec.
|
|
else
|
|
{
|
|
if (NS_AUTOHEIGHT != cbrs->mComputedHeight)
|
|
aContainingBlockHeight = cbrs->mComputedHeight;
|
|
else
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
else {
|
|
// default to interpreting the height like 'auto'
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Compute our offsets if the element is relatively positioned. We need
|
|
// the correct containing block width and height here, which is why we need
|
|
// to do it after all the quirks-n-such above.
|
|
if (NS_STYLE_POSITION_RELATIVE == mStyleDisplay->mPosition) {
|
|
ComputeRelativeOffsets(cbrs, aContainingBlockWidth, aContainingBlockHeight, aPresContext);
|
|
} else {
|
|
// Initialize offsets to 0
|
|
mComputedOffsets.SizeTo(0, 0, 0, 0);
|
|
}
|
|
|
|
// Calculate the computed values for min and max properties. Note that
|
|
// this MUST come after we've computed our border and padding.
|
|
ComputeMinMaxValues(aContainingBlockWidth, aContainingBlockHeight, cbrs);
|
|
|
|
// Calculate the computed width and height. This varies by frame type
|
|
|
|
if (NS_CSS_FRAME_TYPE_INTERNAL_TABLE == mFrameType) {
|
|
// Internal table elements. The rules vary depending on the type.
|
|
// Calculate the computed width
|
|
PRBool rowOrRowGroup = PR_FALSE;
|
|
nsStyleUnit widthUnit = mStylePosition->mWidth.GetUnit();
|
|
if ((NS_STYLE_DISPLAY_TABLE_ROW == mStyleDisplay->mDisplay) ||
|
|
(NS_STYLE_DISPLAY_TABLE_ROW_GROUP == mStyleDisplay->mDisplay)) {
|
|
// 'width' property doesn't apply to table rows and row groups
|
|
widthUnit = eStyleUnit_Auto;
|
|
rowOrRowGroup = PR_TRUE;
|
|
}
|
|
|
|
if (eStyleUnit_Auto == widthUnit) {
|
|
mComputedWidth = availableWidth;
|
|
|
|
if ((mComputedWidth != NS_UNCONSTRAINEDSIZE) && !rowOrRowGroup){
|
|
// Internal table elements don't have margins. Only tables and
|
|
// cells have border and padding
|
|
mComputedWidth -= mComputedBorderPadding.left +
|
|
mComputedBorderPadding.right;
|
|
if (mComputedWidth < 0)
|
|
mComputedWidth = 0;
|
|
}
|
|
NS_ASSERTION(mComputedWidth >= 0, "Bogus computed width");
|
|
|
|
} else {
|
|
NS_ASSERTION(widthUnit == mStylePosition->mWidth.GetUnit(),
|
|
"unexpected width unit change");
|
|
mComputedWidth = ComputeWidthValue(aContainingBlockWidth,
|
|
mStylePosition->mBoxSizing,
|
|
mStylePosition->mWidth);
|
|
}
|
|
|
|
// Calculate the computed height
|
|
if ((NS_STYLE_DISPLAY_TABLE_COLUMN == mStyleDisplay->mDisplay) ||
|
|
(NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP == mStyleDisplay->mDisplay)) {
|
|
// 'height' property doesn't apply to table columns and column groups
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
if (eStyleUnit_Auto == heightUnit) {
|
|
mComputedHeight = NS_AUTOHEIGHT;
|
|
} else {
|
|
NS_ASSERTION(heightUnit == mStylePosition->mHeight.GetUnit(),
|
|
"unexpected height unit change");
|
|
mComputedHeight = nsLayoutUtils::
|
|
ComputeHeightDependentValue(aContainingBlockHeight,
|
|
mStylePosition->mHeight);
|
|
}
|
|
|
|
// Doesn't apply to table elements
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
|
|
} else if (NS_FRAME_GET_TYPE(mFrameType) == NS_CSS_FRAME_TYPE_ABSOLUTE) {
|
|
// XXX not sure if this belongs here or somewhere else - cwk
|
|
InitAbsoluteConstraints(aPresContext, cbrs, aContainingBlockWidth,
|
|
aContainingBlockHeight);
|
|
} else {
|
|
PRBool isBlock =
|
|
NS_CSS_FRAME_TYPE_BLOCK == NS_FRAME_GET_TYPE(mFrameType);
|
|
// make sure legend frames with display:block and width:auto still
|
|
// shrink-wrap
|
|
PRBool shrinkWrap = !isBlock || frame->GetType() == nsGkAtoms::legendFrame;
|
|
nsSize size =
|
|
frame->ComputeSize(rendContext,
|
|
nsSize(aContainingBlockWidth,
|
|
aContainingBlockHeight),
|
|
availableWidth,
|
|
nsSize(mComputedMargin.LeftRight(),
|
|
mComputedMargin.TopBottom()),
|
|
nsSize(mComputedBorderPadding.LeftRight() -
|
|
mComputedPadding.LeftRight(),
|
|
mComputedBorderPadding.TopBottom() -
|
|
mComputedPadding.TopBottom()),
|
|
nsSize(mComputedPadding.LeftRight(),
|
|
mComputedPadding.TopBottom()),
|
|
shrinkWrap);
|
|
|
|
mComputedWidth = size.width;
|
|
mComputedHeight = size.height;
|
|
NS_ASSERTION(mComputedWidth >= 0, "Bogus width");
|
|
NS_ASSERTION(mComputedHeight == NS_UNCONSTRAINEDSIZE ||
|
|
mComputedHeight >= 0, "Bogus height");
|
|
|
|
if (isBlock && !IsSideCaption(frame, mStyleDisplay))
|
|
CalculateBlockSideMargins(availableWidth, mComputedWidth);
|
|
}
|
|
}
|
|
// Check for blinking text and permission to display it
|
|
mFlags.mBlinks = (parentReflowState && parentReflowState->mFlags.mBlinks);
|
|
if (!mFlags.mBlinks && BlinkIsAllowed()) {
|
|
const nsStyleTextReset* st = frame->GetStyleTextReset();
|
|
mFlags.mBlinks =
|
|
((st->mTextDecoration & NS_STYLE_TEXT_DECORATION_BLINK) != 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsCSSOffsetState::InitOffsets(nscoord aContainingBlockWidth,
|
|
const nsMargin *aBorder,
|
|
const nsMargin *aPadding)
|
|
{
|
|
// Compute margins from the specified margin style information. These
|
|
// become the default computed values, and may be adjusted below
|
|
// XXX fix to provide 0,0 for the top&bottom margins for
|
|
// inline-non-replaced elements
|
|
ComputeMargin(aContainingBlockWidth);
|
|
|
|
const nsStyleDisplay *disp = frame->GetStyleDisplay();
|
|
PRBool isThemed = frame->IsThemed(disp);
|
|
nsPresContext *presContext = frame->PresContext();
|
|
|
|
nsIntMargin widget;
|
|
if (isThemed &&
|
|
presContext->GetTheme()->GetWidgetPadding(presContext->DeviceContext(),
|
|
frame, disp->mAppearance,
|
|
&widget)) {
|
|
mComputedPadding.top = presContext->DevPixelsToAppUnits(widget.top);
|
|
mComputedPadding.right = presContext->DevPixelsToAppUnits(widget.right);
|
|
mComputedPadding.bottom = presContext->DevPixelsToAppUnits(widget.bottom);
|
|
mComputedPadding.left = presContext->DevPixelsToAppUnits(widget.left);
|
|
}
|
|
else if (aPadding) { // padding is an input arg
|
|
mComputedPadding.top = aPadding->top;
|
|
mComputedPadding.right = aPadding->right;
|
|
mComputedPadding.bottom = aPadding->bottom;
|
|
mComputedPadding.left = aPadding->left;
|
|
}
|
|
else {
|
|
ComputePadding(aContainingBlockWidth);
|
|
}
|
|
|
|
if (isThemed) {
|
|
nsIntMargin widget;
|
|
presContext->GetTheme()->GetWidgetBorder(presContext->DeviceContext(),
|
|
frame, disp->mAppearance,
|
|
&widget);
|
|
mComputedBorderPadding.top =
|
|
presContext->DevPixelsToAppUnits(widget.top);
|
|
mComputedBorderPadding.right =
|
|
presContext->DevPixelsToAppUnits(widget.right);
|
|
mComputedBorderPadding.bottom =
|
|
presContext->DevPixelsToAppUnits(widget.bottom);
|
|
mComputedBorderPadding.left =
|
|
presContext->DevPixelsToAppUnits(widget.left);
|
|
}
|
|
else if (aBorder) { // border is an input arg
|
|
mComputedBorderPadding = *aBorder;
|
|
}
|
|
else {
|
|
mComputedBorderPadding = frame->GetStyleBorder()->GetActualBorder();
|
|
}
|
|
mComputedBorderPadding += mComputedPadding;
|
|
|
|
nsIAtom* frameType = frame->GetType();
|
|
if (frameType == nsGkAtoms::tableFrame) {
|
|
nsTableFrame *tableFrame = static_cast<nsTableFrame*>(frame);
|
|
|
|
if (tableFrame->IsBorderCollapse()) {
|
|
// border-collapsed tables don't use any of their padding, and
|
|
// only part of their border. We need to do this here before we
|
|
// try to do anything like handling 'auto' widths,
|
|
// '-moz-box-sizing', or 'auto' margins.
|
|
mComputedPadding.SizeTo(0,0,0,0);
|
|
mComputedBorderPadding = tableFrame->GetIncludedOuterBCBorder();
|
|
}
|
|
} else if (frameType == nsGkAtoms::scrollbarFrame) {
|
|
// scrollbars may have had their width or height smashed to zero
|
|
// by the associated scrollframe, in which case we must not report
|
|
// any padding or border.
|
|
nsSize size(frame->GetSize());
|
|
if (size.width == 0 || size.height == 0) {
|
|
mComputedPadding.left = 0;
|
|
mComputedPadding.right = 0;
|
|
mComputedBorderPadding.left = 0;
|
|
mComputedBorderPadding.right = 0;
|
|
mComputedPadding.top = 0;
|
|
mComputedPadding.bottom = 0;
|
|
mComputedBorderPadding.top = 0;
|
|
mComputedBorderPadding.bottom = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
// This code enforces section 10.3.3 of the CSS2 spec for this formula:
|
|
//
|
|
// 'margin-left' + 'border-left-width' + 'padding-left' + 'width' +
|
|
// 'padding-right' + 'border-right-width' + 'margin-right'
|
|
// = width of containing block
|
|
//
|
|
// Note: the width unit is not auto when this is called
|
|
void
|
|
nsHTMLReflowState::CalculateBlockSideMargins(nscoord aAvailWidth,
|
|
nscoord aComputedWidth)
|
|
{
|
|
NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aComputedWidth &&
|
|
NS_UNCONSTRAINEDSIZE != aAvailWidth,
|
|
"this shouldn't happen anymore");
|
|
|
|
nscoord sum = mComputedMargin.left + mComputedBorderPadding.left +
|
|
aComputedWidth + mComputedBorderPadding.right + mComputedMargin.right;
|
|
if (sum == aAvailWidth)
|
|
// The sum is already correct
|
|
return;
|
|
|
|
// Determine the left and right margin values. The width value
|
|
// remains constant while we do this.
|
|
|
|
// Calculate how much space is available for margins
|
|
nscoord availMarginSpace = aAvailWidth - sum;
|
|
|
|
// If the available margin space is negative, then don't follow the
|
|
// usual overconstraint rules.
|
|
if (availMarginSpace < 0) {
|
|
if (mCBReflowState &&
|
|
mCBReflowState->mStyleVisibility->mDirection == NS_STYLE_DIRECTION_RTL) {
|
|
mComputedMargin.left += availMarginSpace;
|
|
} else {
|
|
mComputedMargin.right += availMarginSpace;
|
|
}
|
|
return;
|
|
}
|
|
|
|
// The css2 spec clearly defines how block elements should behave
|
|
// in section 10.3.3.
|
|
PRBool isAutoLeftMargin =
|
|
eStyleUnit_Auto == mStyleMargin->mMargin.GetLeftUnit();
|
|
PRBool isAutoRightMargin =
|
|
eStyleUnit_Auto == mStyleMargin->mMargin.GetRightUnit();
|
|
if (!isAutoLeftMargin && !isAutoRightMargin) {
|
|
// Neither margin is 'auto' so we're over constrained. Use the
|
|
// 'direction' property of the parent to tell which margin to
|
|
// ignore
|
|
// First check if there is an HTML alignment that we should honor
|
|
const nsHTMLReflowState* prs = parentReflowState;
|
|
if (frame->GetType() == nsGkAtoms::tableFrame) {
|
|
NS_ASSERTION(prs->frame->GetType() == nsGkAtoms::tableOuterFrame,
|
|
"table not inside outer table");
|
|
// Center the table within the outer table based on the alignment
|
|
// of the outer table's parent.
|
|
prs = prs->parentReflowState;
|
|
}
|
|
if (prs &&
|
|
(prs->mStyleText->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_LEFT ||
|
|
prs->mStyleText->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_CENTER ||
|
|
prs->mStyleText->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_RIGHT)) {
|
|
isAutoLeftMargin =
|
|
prs->mStyleText->mTextAlign != NS_STYLE_TEXT_ALIGN_MOZ_LEFT;
|
|
isAutoRightMargin =
|
|
prs->mStyleText->mTextAlign != NS_STYLE_TEXT_ALIGN_MOZ_RIGHT;
|
|
}
|
|
// Otherwise apply the CSS rules, and ignore one margin by forcing
|
|
// it to 'auto', depending on 'direction'.
|
|
else if (mCBReflowState &&
|
|
NS_STYLE_DIRECTION_RTL == mCBReflowState->mStyleVisibility->mDirection) {
|
|
isAutoLeftMargin = PR_TRUE;
|
|
}
|
|
else {
|
|
isAutoRightMargin = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
// Logic which is common to blocks and tables
|
|
// The computed margins need not be zero because the 'auto' could come from
|
|
// overconstraint or from HTML alignment so values need to be accumulated
|
|
|
|
if (isAutoLeftMargin) {
|
|
if (isAutoRightMargin) {
|
|
// Both margins are 'auto' so the computed addition should be equal
|
|
nscoord forLeft = availMarginSpace / 2;
|
|
mComputedMargin.left += forLeft;
|
|
mComputedMargin.right += availMarginSpace - forLeft;
|
|
} else {
|
|
mComputedMargin.left += availMarginSpace;
|
|
}
|
|
} else if (isAutoRightMargin) {
|
|
mComputedMargin.right += availMarginSpace;
|
|
}
|
|
}
|
|
|
|
#define NORMAL_LINE_HEIGHT_FACTOR 1.2f // in term of emHeight
|
|
// For "normal" we use the font's normal line height (em height + leading).
|
|
// If both internal leading and external leading specified by font itself
|
|
// are zeros, we should compensate this by creating extra (external) leading
|
|
// in eCompensateLeading mode. This is necessary because without this
|
|
// compensation, normal line height might looks too tight.
|
|
|
|
// For risk management, we use preference to control the behavior, and
|
|
// eNoExternalLeading is the old behavior.
|
|
static nscoord
|
|
GetNormalLineHeight(nsIFontMetrics* aFontMetrics)
|
|
{
|
|
NS_PRECONDITION(nsnull != aFontMetrics, "no font metrics");
|
|
|
|
nscoord normalLineHeight;
|
|
|
|
nscoord externalLeading, internalLeading, emHeight;
|
|
aFontMetrics->GetExternalLeading(externalLeading);
|
|
aFontMetrics->GetInternalLeading(internalLeading);
|
|
aFontMetrics->GetEmHeight(emHeight);
|
|
switch (GetNormalLineHeightCalcControl()) {
|
|
case eIncludeExternalLeading:
|
|
normalLineHeight = emHeight+ internalLeading + externalLeading;
|
|
break;
|
|
case eCompensateLeading:
|
|
if (!internalLeading && !externalLeading)
|
|
normalLineHeight = NSToCoordRound(emHeight * NORMAL_LINE_HEIGHT_FACTOR);
|
|
else
|
|
normalLineHeight = emHeight+ internalLeading + externalLeading;
|
|
break;
|
|
default:
|
|
//case eNoExternalLeading:
|
|
normalLineHeight = emHeight + internalLeading;
|
|
}
|
|
return normalLineHeight;
|
|
}
|
|
|
|
static nscoord
|
|
ComputeLineHeight(nsStyleContext* aStyleContext,
|
|
nscoord aBlockHeight)
|
|
{
|
|
const nsStyleCoord& lhCoord = aStyleContext->GetStyleText()->mLineHeight;
|
|
|
|
if (lhCoord.GetUnit() == eStyleUnit_Coord)
|
|
return lhCoord.GetCoordValue();
|
|
|
|
if (lhCoord.GetUnit() == eStyleUnit_Factor)
|
|
// For factor units the computed value of the line-height property
|
|
// is found by multiplying the factor by the font's computed size
|
|
// (adjusted for min-size prefs and text zoom).
|
|
return NSToCoordRound(lhCoord.GetFactorValue() *
|
|
aStyleContext->GetStyleFont()->mFont.size);
|
|
|
|
NS_ASSERTION(lhCoord.GetUnit() == eStyleUnit_Normal ||
|
|
lhCoord.GetUnit() == eStyleUnit_Enumerated,
|
|
"bad line-height unit");
|
|
|
|
if (lhCoord.GetUnit() == eStyleUnit_Enumerated) {
|
|
NS_ASSERTION(lhCoord.GetIntValue() == NS_STYLE_LINE_HEIGHT_BLOCK_HEIGHT,
|
|
"bad line-height value");
|
|
if (aBlockHeight != NS_AUTOHEIGHT)
|
|
return aBlockHeight;
|
|
}
|
|
|
|
nsCOMPtr<nsIFontMetrics> fm;
|
|
nsLayoutUtils::GetFontMetricsForStyleContext(aStyleContext,
|
|
getter_AddRefs(fm));
|
|
return GetNormalLineHeight(fm);
|
|
}
|
|
|
|
nscoord
|
|
nsHTMLReflowState::CalcLineHeight() const
|
|
{
|
|
nscoord blockHeight =
|
|
frame->IsContainingBlock() ? mComputedHeight :
|
|
(mCBReflowState ? mCBReflowState->mComputedHeight : NS_AUTOHEIGHT);
|
|
|
|
return CalcLineHeight(frame->GetStyleContext(), blockHeight);
|
|
}
|
|
|
|
/* static */ nscoord
|
|
nsHTMLReflowState::CalcLineHeight(nsStyleContext* aStyleContext,
|
|
nscoord aBlockHeight)
|
|
{
|
|
NS_PRECONDITION(aStyleContext, "Must have a style context");
|
|
|
|
nscoord lineHeight = ComputeLineHeight(aStyleContext, aBlockHeight);
|
|
|
|
NS_ASSERTION(lineHeight >= 0, "ComputeLineHeight screwed up");
|
|
|
|
return lineHeight;
|
|
}
|
|
|
|
/* static */
|
|
void
|
|
nsCSSOffsetState::DestroyMarginFunc(void* aFrame,
|
|
nsIAtom* aPropertyName,
|
|
void* aPropertyValue,
|
|
void* aDtorData)
|
|
{
|
|
delete static_cast<nsMargin*>(aPropertyValue);
|
|
}
|
|
|
|
void
|
|
nsCSSOffsetState::ComputeMargin(nscoord aContainingBlockWidth)
|
|
{
|
|
// If style style can provide us the margin directly, then use it.
|
|
const nsStyleMargin *styleMargin = frame->GetStyleMargin();
|
|
if (!styleMargin->GetMargin(mComputedMargin)) {
|
|
// We have to compute the value
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
mComputedMargin.left = 0;
|
|
mComputedMargin.right = 0;
|
|
|
|
if (eStyleUnit_Coord == styleMargin->mMargin.GetLeftUnit()) {
|
|
mComputedMargin.left = styleMargin->mMargin.GetLeft().GetCoordValue();
|
|
}
|
|
if (eStyleUnit_Coord == styleMargin->mMargin.GetRightUnit()) {
|
|
mComputedMargin.right = styleMargin->mMargin.GetRight().GetCoordValue();
|
|
}
|
|
|
|
} else {
|
|
mComputedMargin.left = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
styleMargin->mMargin.GetLeft());
|
|
mComputedMargin.right = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
styleMargin->mMargin.GetRight());
|
|
}
|
|
|
|
// According to the CSS2 spec, margin percentages are
|
|
// calculated with respect to the *width* of the containing
|
|
// block, even for margin-top and margin-bottom.
|
|
// XXX This isn't true for page boxes, if we implement them.
|
|
mComputedMargin.top = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
styleMargin->mMargin.GetTop());
|
|
mComputedMargin.bottom = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
styleMargin->mMargin.GetBottom());
|
|
|
|
// XXX We need to include 'auto' horizontal margins in this too!
|
|
// ... but if we did that, we'd need to fix nsFrame::GetUsedMargin
|
|
// to use it even when the margins are all zero (since sometimes
|
|
// they get treated as auto)
|
|
frame->SetProperty(nsGkAtoms::usedMarginProperty,
|
|
new nsMargin(mComputedMargin),
|
|
DestroyMarginFunc);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsCSSOffsetState::ComputePadding(nscoord aContainingBlockWidth)
|
|
{
|
|
// If style can provide us the padding directly, then use it.
|
|
const nsStylePadding *stylePadding = frame->GetStylePadding();
|
|
if (!stylePadding->GetPadding(mComputedPadding)) {
|
|
// We have to compute the value
|
|
mComputedPadding.left = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
stylePadding->mPadding.GetLeft());
|
|
mComputedPadding.right = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
stylePadding->mPadding.GetRight());
|
|
|
|
// According to the CSS2 spec, percentages are calculated with respect to
|
|
// containing block width for padding-top and padding-bottom
|
|
mComputedPadding.top = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
stylePadding->mPadding.GetTop());
|
|
mComputedPadding.bottom = nsLayoutUtils::
|
|
ComputeWidthDependentValue(aContainingBlockWidth,
|
|
stylePadding->mPadding.GetBottom());
|
|
|
|
frame->SetProperty(nsGkAtoms::usedPaddingProperty,
|
|
new nsMargin(mComputedPadding),
|
|
DestroyMarginFunc);
|
|
}
|
|
// a table row/col group, row/col doesn't have padding
|
|
// XXXldb Neither do border-collapse tables.
|
|
nsIAtom* frameType = frame->GetType();
|
|
if (nsGkAtoms::tableRowGroupFrame == frameType ||
|
|
nsGkAtoms::tableColGroupFrame == frameType ||
|
|
nsGkAtoms::tableRowFrame == frameType ||
|
|
nsGkAtoms::tableColFrame == frameType) {
|
|
mComputedPadding.top = 0;
|
|
mComputedPadding.right = 0;
|
|
mComputedPadding.bottom = 0;
|
|
mComputedPadding.left = 0;
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ApplyMinMaxConstraints(nscoord* aFrameWidth,
|
|
nscoord* aFrameHeight) const
|
|
{
|
|
if (aFrameWidth) {
|
|
if (NS_UNCONSTRAINEDSIZE != mComputedMaxWidth) {
|
|
*aFrameWidth = NS_MIN(*aFrameWidth, mComputedMaxWidth);
|
|
}
|
|
*aFrameWidth = NS_MAX(*aFrameWidth, mComputedMinWidth);
|
|
}
|
|
|
|
if (aFrameHeight) {
|
|
if (NS_UNCONSTRAINEDSIZE != mComputedMaxHeight) {
|
|
*aFrameHeight = NS_MIN(*aFrameHeight, mComputedMaxHeight);
|
|
}
|
|
*aFrameHeight = NS_MAX(*aFrameHeight, mComputedMinHeight);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeMinMaxValues(nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsHTMLReflowState* aContainingBlockRS)
|
|
{
|
|
mComputedMinWidth = ComputeWidthValue(aContainingBlockWidth,
|
|
mStylePosition->mBoxSizing,
|
|
mStylePosition->mMinWidth);
|
|
|
|
if (eStyleUnit_None == mStylePosition->mMaxWidth.GetUnit()) {
|
|
// Specified value of 'none'
|
|
mComputedMaxWidth = NS_UNCONSTRAINEDSIZE; // no limit
|
|
} else {
|
|
mComputedMaxWidth = ComputeWidthValue(aContainingBlockWidth,
|
|
mStylePosition->mBoxSizing,
|
|
mStylePosition->mMaxWidth);
|
|
}
|
|
|
|
// If the computed value of 'min-width' is greater than the value of
|
|
// 'max-width', 'max-width' is set to the value of 'min-width'
|
|
if (mComputedMinWidth > mComputedMaxWidth) {
|
|
mComputedMaxWidth = mComputedMinWidth;
|
|
}
|
|
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if ((NS_AUTOHEIGHT == aContainingBlockHeight) &&
|
|
(eStyleUnit_Percent == mStylePosition->mMinHeight.GetUnit())) {
|
|
mComputedMinHeight = 0;
|
|
} else {
|
|
mComputedMinHeight = nsLayoutUtils::
|
|
ComputeHeightDependentValue(aContainingBlockHeight,
|
|
mStylePosition->mMinHeight);
|
|
}
|
|
nsStyleUnit maxHeightUnit = mStylePosition->mMaxHeight.GetUnit();
|
|
if (eStyleUnit_None == maxHeightUnit) {
|
|
// Specified value of 'none'
|
|
mComputedMaxHeight = NS_UNCONSTRAINEDSIZE; // no limit
|
|
} else {
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if ((NS_AUTOHEIGHT == aContainingBlockHeight) &&
|
|
(eStyleUnit_Percent == maxHeightUnit)) {
|
|
mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
mComputedMaxHeight = nsLayoutUtils::
|
|
ComputeHeightDependentValue(aContainingBlockHeight,
|
|
mStylePosition->mMaxHeight);
|
|
}
|
|
}
|
|
|
|
// If the computed value of 'min-height' is greater than the value of
|
|
// 'max-height', 'max-height' is set to the value of 'min-height'
|
|
if (mComputedMinHeight > mComputedMaxHeight) {
|
|
mComputedMaxHeight = mComputedMinHeight;
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::SetTruncated(const nsHTMLReflowMetrics& aMetrics,
|
|
nsReflowStatus* aStatus) const
|
|
{
|
|
if (availableHeight != NS_UNCONSTRAINEDSIZE &&
|
|
availableHeight < aMetrics.height &&
|
|
!mFlags.mIsTopOfPage) {
|
|
*aStatus |= NS_FRAME_TRUNCATED;
|
|
} else {
|
|
*aStatus &= ~NS_FRAME_TRUNCATED;
|
|
}
|
|
}
|