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729 lines
32 KiB
C++
729 lines
32 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* struct containing the input to nsIFrame::Reflow */
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#ifndef nsHTMLReflowState_h___
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#define nsHTMLReflowState_h___
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#include "nsMargin.h"
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#include "nsStyleCoord.h"
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#include "nsIFrame.h"
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#include "mozilla/Assertions.h"
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#include <algorithm>
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class nsPresContext;
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class nsRenderingContext;
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class nsFloatManager;
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class nsLineLayout;
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class nsIPercentHeightObserver;
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struct nsHypotheticalBox;
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/**
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* @return aValue clamped to [aMinValue, aMaxValue].
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*
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* @note This function needs to handle aMinValue > aMaxValue. In that case,
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* aMinValue is returned.
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* @see http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
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* @see http://www.w3.org/TR/CSS21/visudet.html#min-max-heights
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*/
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template <class NumericType>
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NumericType
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NS_CSS_MINMAX(NumericType aValue, NumericType aMinValue, NumericType aMaxValue)
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{
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NumericType result = aValue;
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if (aMaxValue < result)
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result = aMaxValue;
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if (aMinValue > result)
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result = aMinValue;
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return result;
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}
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/**
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* CSS Frame type. Included as part of the reflow state.
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*/
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typedef uint32_t nsCSSFrameType;
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#define NS_CSS_FRAME_TYPE_UNKNOWN 0
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#define NS_CSS_FRAME_TYPE_INLINE 1
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#define NS_CSS_FRAME_TYPE_BLOCK 2 /* block-level in normal flow */
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#define NS_CSS_FRAME_TYPE_FLOATING 3
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#define NS_CSS_FRAME_TYPE_ABSOLUTE 4
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#define NS_CSS_FRAME_TYPE_INTERNAL_TABLE 5 /* row group frame, row frame, cell frame, ... */
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/**
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* Bit-flag that indicates whether the element is replaced. Applies to inline,
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* block-level, floating, and absolutely positioned elements
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*/
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#define NS_CSS_FRAME_TYPE_REPLACED 0x08000
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/**
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* Bit-flag that indicates that the element is replaced and contains a block
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* (eg some form controls). Applies to inline, block-level, floating, and
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* absolutely positioned elements. Mutually exclusive with
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* NS_CSS_FRAME_TYPE_REPLACED.
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*/
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#define NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK 0x10000
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/**
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* Helper macros for telling whether items are replaced
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*/
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#define NS_FRAME_IS_REPLACED_NOBLOCK(_ft) \
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(NS_CSS_FRAME_TYPE_REPLACED == ((_ft) & NS_CSS_FRAME_TYPE_REPLACED))
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#define NS_FRAME_IS_REPLACED(_ft) \
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(NS_FRAME_IS_REPLACED_NOBLOCK(_ft) || \
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NS_FRAME_IS_REPLACED_CONTAINS_BLOCK(_ft))
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#define NS_FRAME_REPLACED(_ft) \
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(NS_CSS_FRAME_TYPE_REPLACED | (_ft))
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#define NS_FRAME_IS_REPLACED_CONTAINS_BLOCK(_ft) \
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(NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK == \
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((_ft) & NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK))
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#define NS_FRAME_REPLACED_CONTAINS_BLOCK(_ft) \
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(NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK | (_ft))
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/**
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* A macro to extract the type. Masks off the 'replaced' bit-flag
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*/
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#define NS_FRAME_GET_TYPE(_ft) \
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((_ft) & ~(NS_CSS_FRAME_TYPE_REPLACED | \
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NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK))
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// A base class of nsHTMLReflowState that computes only the padding,
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// border, and margin, since those values are needed more often.
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struct nsCSSOffsetState {
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public:
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typedef mozilla::WritingMode WritingMode;
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typedef mozilla::LogicalMargin LogicalMargin;
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// the frame being reflowed
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nsIFrame* frame;
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// rendering context to use for measurement
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nsRenderingContext* rendContext;
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const nsMargin& ComputedPhysicalMargin() const { return mComputedMargin; }
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const nsMargin& ComputedPhysicalBorderPadding() const { return mComputedBorderPadding; }
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const nsMargin& ComputedPhysicalPadding() const { return mComputedPadding; }
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// We may need to eliminate the (few) users of these writable-reference accessors
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// as part of migrating to logical coordinates.
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nsMargin& ComputedPhysicalMargin() { return mComputedMargin; }
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nsMargin& ComputedPhysicalBorderPadding() { return mComputedBorderPadding; }
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nsMargin& ComputedPhysicalPadding() { return mComputedPadding; }
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LogicalMargin ComputedLogicalMargin() const
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{ return LogicalMargin(mWritingMode, mComputedMargin); }
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LogicalMargin ComputedLogicalBorderPadding() const
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{ return LogicalMargin(mWritingMode, mComputedBorderPadding); }
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LogicalMargin ComputedLogicalPadding() const
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{ return LogicalMargin(mWritingMode, mComputedPadding); }
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WritingMode GetWritingMode() const { return mWritingMode; }
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protected:
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// cached copy of the frame's writing-mode, for logical coordinates
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WritingMode mWritingMode;
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// These are PHYSICAL coordinates (for now).
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// Will probably become logical in due course.
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// Computed margin values
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nsMargin mComputedMargin;
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// Cached copy of the border + padding values
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nsMargin mComputedBorderPadding;
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// Computed padding values
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nsMargin mComputedPadding;
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public:
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// Callers using this constructor must call InitOffsets on their own.
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nsCSSOffsetState(nsIFrame *aFrame, nsRenderingContext *aRenderingContext)
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: frame(aFrame)
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, rendContext(aRenderingContext)
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, mWritingMode(aFrame->GetWritingMode())
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{
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}
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// NOTE: If we ever want to use nsCSSOffsetState for a flex item or a grid
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// item, we need to make it take the containing-block height as well as the
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// width, since flex items and grid items resolve vertical percent margins
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// and padding against the containing-block height, rather than its width.
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nsCSSOffsetState(nsIFrame *aFrame, nsRenderingContext *aRenderingContext,
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nscoord aContainingBlockWidth)
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: frame(aFrame)
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, rendContext(aRenderingContext)
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, mWritingMode(aFrame->GetWritingMode())
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{
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MOZ_ASSERT(!aFrame->IsFlexItem(),
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"We're about to resolve vertical percent margin & padding "
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"values against CB width, which is incorrect for flex items");
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InitOffsets(aContainingBlockWidth, aContainingBlockWidth, frame->GetType());
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}
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#ifdef DEBUG
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// Reflow trace methods. Defined in nsFrame.cpp so they have access
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// to the display-reflow infrastructure.
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static void* DisplayInitOffsetsEnter(nsIFrame* aFrame,
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nsCSSOffsetState* aState,
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nscoord aHorizontalPercentBasis,
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nscoord aVerticalPercentBasis,
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const nsMargin* aBorder,
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const nsMargin* aPadding);
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static void DisplayInitOffsetsExit(nsIFrame* aFrame,
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nsCSSOffsetState* aState,
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void* aValue);
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#endif
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private:
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/**
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* Computes margin values from the specified margin style information, and
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* fills in the mComputedMargin member.
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*
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* @param aHorizontalPercentBasis
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* Length to use for resolving percentage margin values in the horizontal
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* axis. Usually the containing block width.
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* @param aVerticalPercentBasis
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* Length to use for resolving percentage margin values in the vertical
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* axis. Usually the containing block width, per CSS21 sec 8.3, but may
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* be the containing block *height*, e.g. in CSS3 Flexbox and Grid.
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* @return true if the margin is dependent on the containing block size.
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*/
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bool ComputeMargin(nscoord aHorizontalPercentBasis,
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nscoord aVerticalPercentBasis);
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/**
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* Computes padding values from the specified padding style information, and
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* fills in the mComputedPadding member.
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*
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* @param aHorizontalPercentBasis
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* Length to use for resolving percentage padding values in the horizontal
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* axis. Usually the containing block width.
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* @param aVerticalPercentBasis
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* Length to use for resolving percentage padding values in the vertical
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* axis. Usually the containing block width, per CSS21 sec 8.4, but may
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* be the containing block *height* in e.g. CSS3 Flexbox and Grid.
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* @return true if the padding is dependent on the containing block size.
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*/
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bool ComputePadding(nscoord aHorizontalPercentBasis,
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nscoord aVerticalPercentBasis, nsIAtom* aFrameType);
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protected:
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void InitOffsets(nscoord aHorizontalPercentBasis,
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nscoord aVerticalPercentBasis,
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nsIAtom* aFrameType,
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const nsMargin *aBorder = nullptr,
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const nsMargin *aPadding = nullptr);
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/*
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* Convert nsStyleCoord to nscoord when percentages depend on the
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* containing block width, and enumerated values are for width,
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* min-width, or max-width. Does not handle auto widths.
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*/
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inline nscoord 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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// same as previous, but using mComputedBorderPadding, mComputedPadding,
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// and mComputedMargin
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nscoord ComputeWidthValue(nscoord aContainingBlockWidth,
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uint8_t aBoxSizing,
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const nsStyleCoord& aCoord);
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nscoord ComputeHeightValue(nscoord aContainingBlockHeight,
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uint8_t aBoxSizing,
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const nsStyleCoord& aCoord);
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};
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/**
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* State passed to a frame during reflow or intrinsic size calculation.
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*
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* XXX Refactor so only a base class (nsSizingState?) is used for intrinsic
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* size calculation.
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*
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* @see nsIFrame#Reflow()
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*/
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struct nsHTMLReflowState : public nsCSSOffsetState {
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// the reflow states are linked together. this is the pointer to the
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// parent's reflow state
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const nsHTMLReflowState* parentReflowState;
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// pointer to the float manager associated with this area
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nsFloatManager* mFloatManager;
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// LineLayout object (only for inline reflow; set to nullptr otherwise)
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nsLineLayout* mLineLayout;
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// The appropriate reflow state for the containing block (for
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// percentage widths, etc.) of this reflow state's frame.
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const nsHTMLReflowState *mCBReflowState;
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// The type of frame, from css's perspective. This value is
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// initialized by the Init method below.
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nsCSSFrameType mFrameType;
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// The amount the in-flow position of the block is moving vertically relative
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// to its previous in-flow position (i.e. the amount the line containing the
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// block is moving).
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// This should be zero for anything which is not a block outside, and it
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// should be zero for anything which has a non-block parent.
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// The intended use of this value is to allow the accurate determination
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// of the potential impact of a float
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// This takes on an arbitrary value the first time a block is reflowed
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nscoord mBlockDelta;
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// Accessors for the private fields below. Forcing all callers to use these
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// will allow us to introduce logical-coordinate versions and gradually
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// change clients from physical to logical as needed; and potentially switch
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// the internal fields from physical to logical coordinates in due course,
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// while maintaining compatibility with not-yet-updated code.
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nscoord AvailableWidth() const { return mAvailableWidth; }
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nscoord AvailableHeight() const { return mAvailableHeight; }
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nscoord ComputedWidth() const { return mComputedWidth; }
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nscoord ComputedHeight() const { return mComputedHeight; }
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nscoord ComputedMinWidth() const { return mComputedMinWidth; }
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nscoord ComputedMaxWidth() const { return mComputedMaxWidth; }
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nscoord ComputedMinHeight() const { return mComputedMinHeight; }
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nscoord ComputedMaxHeight() const { return mComputedMaxHeight; }
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nscoord& AvailableWidth() { return mAvailableWidth; }
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nscoord& AvailableHeight() { return mAvailableHeight; }
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nscoord& ComputedWidth() { return mComputedWidth; }
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nscoord& ComputedHeight() { return mComputedHeight; }
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nscoord& ComputedMinWidth() { return mComputedMinWidth; }
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nscoord& ComputedMaxWidth() { return mComputedMaxWidth; }
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nscoord& ComputedMinHeight() { return mComputedMinHeight; }
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nscoord& ComputedMaxHeight() { return mComputedMaxHeight; }
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// ISize and BSize are logical-coordinate dimensions:
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// ISize is the size in the writing mode's inline direction (which equates to
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// width in horizontal writing modes, height in vertical ones), and BSize is
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// the size in the block-progression direction.
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nscoord AvailableISize() const
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{ return mWritingMode.IsVertical() ? mAvailableHeight : mAvailableWidth; }
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nscoord AvailableBSize() const
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{ return mWritingMode.IsVertical() ? mAvailableWidth : mAvailableHeight; }
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nscoord ComputedISize() const
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{ return mWritingMode.IsVertical() ? mComputedHeight : mComputedWidth; }
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nscoord ComputedBSize() const
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{ return mWritingMode.IsVertical() ? mComputedWidth : mComputedHeight; }
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nscoord ComputedMinISize() const
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{ return mWritingMode.IsVertical() ? mComputedMinHeight : mComputedMinWidth; }
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nscoord ComputedMaxISize() const
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{ return mWritingMode.IsVertical() ? mComputedMaxHeight : mComputedMaxWidth; }
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nscoord ComputedMinBSize() const
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{ return mWritingMode.IsVertical() ? mComputedMinWidth : mComputedMinHeight; }
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nscoord ComputedMaxBSize() const
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{ return mWritingMode.IsVertical() ? mComputedMaxWidth : mComputedMaxHeight; }
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nscoord& AvailableISize()
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{ return mWritingMode.IsVertical() ? mAvailableHeight : mAvailableWidth; }
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nscoord& AvailableBSize()
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{ return mWritingMode.IsVertical() ? mAvailableWidth : mAvailableHeight; }
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nscoord& ComputedISize()
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{ return mWritingMode.IsVertical() ? mComputedHeight : mComputedWidth; }
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nscoord& ComputedBSize()
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{ return mWritingMode.IsVertical() ? mComputedWidth : mComputedHeight; }
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nscoord& ComputedMinISize()
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{ return mWritingMode.IsVertical() ? mComputedMinHeight : mComputedMinWidth; }
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nscoord& ComputedMaxISize()
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{ return mWritingMode.IsVertical() ? mComputedMaxHeight : mComputedMaxWidth; }
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nscoord& ComputedMinBSize()
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{ return mWritingMode.IsVertical() ? mComputedMinWidth : mComputedMinHeight; }
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nscoord& ComputedMaxBSize()
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{ return mWritingMode.IsVertical() ? mComputedMaxWidth : mComputedMaxHeight; }
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// XXX this will need to change when we make mComputedOffsets logical;
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// we won't be able to return a reference for the physical offsets
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const nsMargin& ComputedPhysicalOffsets() const { return mComputedOffsets; }
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nsMargin& ComputedPhysicalOffsets() { return mComputedOffsets; }
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LogicalMargin ComputedLogicalOffsets() const
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{ return LogicalMargin(mWritingMode, mComputedOffsets); }
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private:
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// the available width in which to reflow the frame. The space
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// represents the amount of room for the frame's margin, border,
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// padding, and content area. The frame size you choose should fit
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// within the available width.
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nscoord mAvailableWidth;
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// A value of NS_UNCONSTRAINEDSIZE for the available height means
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// you can choose whatever size you want. In galley mode the
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// available height is always NS_UNCONSTRAINEDSIZE, and only page
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// mode or multi-column layout involves a constrained height. The
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// element's the top border and padding, and content, must fit. If the
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// element is complete after reflow then its bottom border, padding
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// and margin (and similar for its complete ancestors) will need to
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// fit in this height.
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nscoord mAvailableHeight;
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// The computed width specifies the frame's content area width, and it does
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// not apply to inline non-replaced elements
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//
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// For replaced inline frames, a value of NS_INTRINSICSIZE means you should
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// use your intrinsic width as the computed width
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//
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// For block-level frames, the computed width is based on the width of the
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// containing block, the margin/border/padding areas, and the min/max width.
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nscoord mComputedWidth;
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// The computed height specifies the frame's content height, and it does
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// not apply to inline non-replaced elements
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//
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// For replaced inline frames, a value of NS_INTRINSICSIZE means you should
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// use your intrinsic height as the computed height
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//
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// For non-replaced block-level frames in the flow and floated, a value of
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// NS_AUTOHEIGHT means you choose a height to shrink wrap around the normal
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// flow child frames. The height must be within the limit of the min/max
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// height if there is such a limit
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//
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// For replaced block-level frames, a value of NS_INTRINSICSIZE
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// means you use your intrinsic height as the computed height
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nscoord mComputedHeight;
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// Computed values for 'left/top/right/bottom' offsets. Only applies to
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// 'positioned' elements. These are PHYSICAL coordinates (for now).
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nsMargin mComputedOffsets;
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// Computed values for 'min-width/max-width' and 'min-height/max-height'
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// XXXldb The width ones here should go; they should be needed only
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// internally.
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nscoord mComputedMinWidth, mComputedMaxWidth;
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nscoord mComputedMinHeight, mComputedMaxHeight;
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public:
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// Cached pointers to the various style structs used during intialization
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const nsStyleDisplay* mStyleDisplay;
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const nsStyleVisibility* mStyleVisibility;
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const nsStylePosition* mStylePosition;
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const nsStyleBorder* mStyleBorder;
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const nsStyleMargin* mStyleMargin;
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const nsStylePadding* mStylePadding;
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const nsStyleText* mStyleText;
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bool IsFloating() const;
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uint8_t GetDisplay() const;
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// a frame (e.g. nsTableCellFrame) which may need to generate a special
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// reflow for percent height calculations
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nsIPercentHeightObserver* mPercentHeightObserver;
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// CSS margin collapsing sometimes requires us to reflow
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// optimistically assuming that margins collapse to see if clearance
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// is required. When we discover that clearance is required, we
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// store the frame in which clearance was discovered to the location
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// requested here.
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nsIFrame** mDiscoveredClearance;
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// This value keeps track of how deeply nested a given reflow state
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// is from the top of the frame tree.
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int16_t mReflowDepth;
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struct ReflowStateFlags {
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uint16_t mSpecialHeightReflow:1; // used by tables to communicate special reflow (in process) to handle
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// percent height frames inside cells which may not have computed heights
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uint16_t mNextInFlowUntouched:1; // nothing in the frame's next-in-flow (or its descendants)
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// is changing
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uint16_t mIsTopOfPage:1; // Is the current context at the top of a
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// page? When true, we force something
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// that's too tall for a page/column to
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// fit anyway to avoid infinite loops.
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uint16_t mHasClearance:1; // Block has clearance
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uint16_t mAssumingHScrollbar:1; // parent frame is an nsIScrollableFrame and it
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// is assuming a horizontal scrollbar
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uint16_t mAssumingVScrollbar:1; // parent frame is an nsIScrollableFrame and it
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// is assuming a vertical scrollbar
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uint16_t mHResize:1; // Is frame (a) not dirty and (b) a
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|
// different width than before?
|
|
|
|
uint16_t mVResize:1; // Is frame (a) not dirty and (b) a
|
|
// different height than before or
|
|
// (potentially) in a context where
|
|
// percent heights have a different
|
|
// basis?
|
|
uint16_t mTableIsSplittable:1; // tables are splittable, this should happen only inside a page
|
|
// and never insider a column frame
|
|
uint16_t mHeightDependsOnAncestorCell:1; // Does frame height depend on
|
|
// an ancestor table-cell?
|
|
uint16_t mIsColumnBalancing:1; // nsColumnSetFrame is balancing columns
|
|
uint16_t mIsFlexContainerMeasuringHeight:1; // nsFlexContainerFrame is
|
|
// reflowing this child to
|
|
// measure its intrinsic height.
|
|
uint16_t mDummyParentReflowState:1; // a "fake" reflow state made
|
|
// in order to be the parent
|
|
// of a real one
|
|
uint16_t mMustReflowPlaceholders:1; // Should this frame reflow its place-
|
|
// holder children? If the available
|
|
// height of this frame didn't change,
|
|
// but its in a paginated environment
|
|
// (e.g. columns), it should always
|
|
// reflow its placeholder children.
|
|
} mFlags;
|
|
|
|
// Note: The copy constructor is written by the compiler automatically. You
|
|
// can use that and then override specific values if you want, or you can
|
|
// call Init as desired...
|
|
|
|
/**
|
|
* Initialize a ROOT reflow state.
|
|
*
|
|
* @param aPresContext Must be equal to aFrame->PresContext().
|
|
* @param aFrame The frame for whose reflow state is being constructed.
|
|
* @param aRenderingContext The rendering context to be used for measurements.
|
|
* @param aAvailableSpace See comments for availableHeight and availableWidth
|
|
* members.
|
|
* @param aFlags A set of flags used for additional boolean parameters (see
|
|
* below).
|
|
*/
|
|
nsHTMLReflowState(nsPresContext* aPresContext,
|
|
nsIFrame* aFrame,
|
|
nsRenderingContext* aRenderingContext,
|
|
const nsSize& aAvailableSpace,
|
|
uint32_t aFlags = 0);
|
|
|
|
/**
|
|
* Initialize a reflow state for a child frame's reflow. Some parts of the
|
|
* state are copied from the parent's reflow state. The remainder is computed.
|
|
*
|
|
* @param aPresContext Must be equal to aFrame->PresContext().
|
|
* @param aParentReflowState A reference to an nsHTMLReflowState object that
|
|
* is to be the parent of this object.
|
|
* @param aFrame The frame for whose reflow state is being constructed.
|
|
* @param aAvailableSpace See comments for availableHeight and availableWidth
|
|
* members.
|
|
* @param aContainingBlockWidth An optional width, in app units, that is used
|
|
* by absolute positioning code to override default containing block
|
|
* width.
|
|
* @param aContainingBlockHeight An optional height, in app units, that is
|
|
* used by absolute positioning code to override default containing
|
|
* block height.
|
|
* @param aFlags A set of flags used for additional boolean parameters (see
|
|
* below).
|
|
*/
|
|
nsHTMLReflowState(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState& aParentReflowState,
|
|
nsIFrame* aFrame,
|
|
const nsSize& aAvailableSpace,
|
|
nscoord aContainingBlockWidth = -1,
|
|
nscoord aContainingBlockHeight = -1,
|
|
uint32_t aFlags = 0);
|
|
|
|
// Values for |aFlags| passed to constructor
|
|
enum {
|
|
// Indicates that the parent of this reflow state is "fake" (see
|
|
// mDummyParentReflowState in mFlags).
|
|
DUMMY_PARENT_REFLOW_STATE = (1<<0),
|
|
|
|
// Indicates that the calling function will initialize the reflow state, and
|
|
// that the constructor should not call Init().
|
|
CALLER_WILL_INIT = (1<<1)
|
|
};
|
|
|
|
// This method initializes various data members. It is automatically
|
|
// called by the various constructors
|
|
void Init(nsPresContext* aPresContext,
|
|
nscoord aContainingBlockWidth = -1,
|
|
nscoord aContainingBlockHeight = -1,
|
|
const nsMargin* aBorder = nullptr,
|
|
const nsMargin* aPadding = nullptr);
|
|
/**
|
|
* Find the content width of the containing block of aReflowState
|
|
*/
|
|
static nscoord
|
|
GetContainingBlockContentWidth(const nsHTMLReflowState* aReflowState);
|
|
|
|
/**
|
|
* Calculate the used line-height property. The return value will be >= 0.
|
|
*/
|
|
nscoord CalcLineHeight() const;
|
|
|
|
/**
|
|
* Same as CalcLineHeight() above, but doesn't need a reflow state.
|
|
*
|
|
* @param aBlockHeight The computed height of the content rect of the block
|
|
* that the line should fill.
|
|
* Only used with line-height:-moz-block-height.
|
|
* NS_AUTOHEIGHT results in a normal line-height for
|
|
* line-height:-moz-block-height.
|
|
* @param aFontSizeInflation The result of the appropriate
|
|
* nsLayoutUtils::FontSizeInflationFor call,
|
|
* or 1.0 if during intrinsic size
|
|
* calculation.
|
|
*/
|
|
static nscoord CalcLineHeight(nsStyleContext* aStyleContext,
|
|
nscoord aBlockHeight,
|
|
float aFontSizeInflation);
|
|
|
|
|
|
void ComputeContainingBlockRectangle(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState* aContainingBlockRS,
|
|
nscoord& aContainingBlockWidth,
|
|
nscoord& aContainingBlockHeight);
|
|
|
|
/**
|
|
* Apply the mComputed(Min/Max)Width constraints to the content
|
|
* size computed so far.
|
|
*/
|
|
nscoord ApplyMinMaxWidth(nscoord aWidth) const {
|
|
if (NS_UNCONSTRAINEDSIZE != ComputedMaxWidth()) {
|
|
aWidth = std::min(aWidth, ComputedMaxWidth());
|
|
}
|
|
return std::max(aWidth, ComputedMinWidth());
|
|
}
|
|
|
|
/**
|
|
* Apply the mComputed(Min/Max)Height constraints to the content
|
|
* size computed so far.
|
|
*
|
|
* @param aHeight The height that we've computed an to which we want to apply
|
|
* min/max constraints.
|
|
* @param aConsumed The amount of the computed height that was consumed by
|
|
* our prev-in-flows.
|
|
*/
|
|
nscoord ApplyMinMaxHeight(nscoord aHeight, nscoord aConsumed = 0) const {
|
|
aHeight += aConsumed;
|
|
|
|
if (NS_UNCONSTRAINEDSIZE != ComputedMaxHeight()) {
|
|
aHeight = std::min(aHeight, ComputedMaxHeight());
|
|
}
|
|
|
|
if (NS_UNCONSTRAINEDSIZE != ComputedMinHeight()) {
|
|
aHeight = std::max(aHeight, ComputedMinHeight());
|
|
}
|
|
|
|
return aHeight - aConsumed;
|
|
}
|
|
|
|
bool ShouldReflowAllKids() const {
|
|
// Note that we could make a stronger optimization for mVResize if
|
|
// we use it in a ShouldReflowChild test that replaces the current
|
|
// checks of NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN, if it
|
|
// were tested there along with NS_FRAME_CONTAINS_RELATIVE_HEIGHT.
|
|
// This would need to be combined with a slight change in which
|
|
// frames NS_FRAME_CONTAINS_RELATIVE_HEIGHT is marked on.
|
|
return (frame->GetStateBits() & NS_FRAME_IS_DIRTY) ||
|
|
mFlags.mHResize ||
|
|
(mFlags.mVResize &&
|
|
(frame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_HEIGHT));
|
|
}
|
|
|
|
// This method doesn't apply min/max computed widths to the value passed in.
|
|
void SetComputedWidth(nscoord aComputedWidth);
|
|
|
|
// This method doesn't apply min/max computed heights to the value passed in.
|
|
void SetComputedHeight(nscoord aComputedHeight);
|
|
|
|
void SetComputedHeightWithoutResettingResizeFlags(nscoord aComputedHeight) {
|
|
// Viewport frames reset the computed height on a copy of their reflow
|
|
// state when reflowing fixed-pos kids. In that case we actually don't
|
|
// want to mess with the resize flags, because comparing the frame's rect
|
|
// to the munged computed width is pointless.
|
|
ComputedHeight() = aComputedHeight;
|
|
}
|
|
|
|
void SetTruncated(const nsHTMLReflowMetrics& aMetrics, nsReflowStatus* aStatus) const;
|
|
|
|
bool WillReflowAgainForClearance() const {
|
|
return mDiscoveredClearance && *mDiscoveredClearance;
|
|
}
|
|
|
|
// Compute the offsets for a relative position element
|
|
static void ComputeRelativeOffsets(uint8_t aCBDirection,
|
|
nsIFrame* aFrame,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
nsMargin& aComputedOffsets);
|
|
|
|
// If a relatively positioned element, adjust the position appropriately.
|
|
static void ApplyRelativePositioning(nsIFrame* aFrame,
|
|
const nsMargin& aComputedOffsets,
|
|
nsPoint* aPosition);
|
|
|
|
void ApplyRelativePositioning(nsPoint* aPosition) const {
|
|
ApplyRelativePositioning(frame, ComputedPhysicalOffsets(), aPosition);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
// Reflow trace methods. Defined in nsFrame.cpp so they have access
|
|
// to the display-reflow infrastructure.
|
|
static void* DisplayInitConstraintsEnter(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState,
|
|
nscoord aCBWidth,
|
|
nscoord aCBHeight,
|
|
const nsMargin* aBorder,
|
|
const nsMargin* aPadding);
|
|
static void DisplayInitConstraintsExit(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState,
|
|
void* aValue);
|
|
static void* DisplayInitFrameTypeEnter(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState);
|
|
static void DisplayInitFrameTypeExit(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState,
|
|
void* aValue);
|
|
#endif
|
|
|
|
protected:
|
|
void InitFrameType(nsIAtom* aFrameType);
|
|
void InitCBReflowState();
|
|
void InitResizeFlags(nsPresContext* aPresContext, nsIAtom* aFrameType);
|
|
|
|
void InitConstraints(nsPresContext* aPresContext,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsMargin* aBorder,
|
|
const nsMargin* aPadding,
|
|
nsIAtom* aFrameType);
|
|
|
|
// Returns the nearest containing block or block frame (whether or not
|
|
// it is a containing block) for the specified frame. Also returns
|
|
// the left edge and width of the containing block's content area.
|
|
// These are returned in the coordinate space of the containing block.
|
|
nsIFrame* GetHypotheticalBoxContainer(nsIFrame* aFrame,
|
|
nscoord& aCBLeftEdge,
|
|
nscoord& aCBWidth);
|
|
|
|
void CalculateHypotheticalBox(nsPresContext* aPresContext,
|
|
nsIFrame* aPlaceholderFrame,
|
|
nsIFrame* aContainingBlock,
|
|
nscoord aBlockLeftContentEdge,
|
|
nscoord aBlockContentWidth,
|
|
const nsHTMLReflowState* cbrs,
|
|
nsHypotheticalBox& aHypotheticalBox,
|
|
nsIAtom* aFrameType);
|
|
|
|
void InitAbsoluteConstraints(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState* cbrs,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
nsIAtom* aFrameType);
|
|
|
|
// Calculates the computed values for the 'min-Width', 'max-Width',
|
|
// 'min-Height', and 'max-Height' properties, and stores them in the assorted
|
|
// data members
|
|
void ComputeMinMaxValues(nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsHTMLReflowState* aContainingBlockRS);
|
|
|
|
void CalculateHorizBorderPaddingMargin(nscoord aContainingBlockWidth,
|
|
nscoord* aInsideBoxSizing,
|
|
nscoord* aOutsideBoxSizing);
|
|
|
|
void CalculateBlockSideMargins(nscoord aAvailWidth,
|
|
nscoord aComputedWidth,
|
|
nsIAtom* aFrameType);
|
|
};
|
|
|
|
#endif /* nsHTMLReflowState_h___ */
|
|
|