mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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536 lines
22 KiB
C++
536 lines
22 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/AutoRestore.h"
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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 nsStyleDisplay;
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struct nsStyleVisibility;
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struct nsStylePosition;
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struct nsStyleBorder;
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struct nsStyleMargin;
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struct nsStylePadding;
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struct nsStyleText;
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struct nsHypotheticalBox;
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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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* Constant used to indicate an unconstrained size.
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*
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* @see #Reflow()
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*/
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#define NS_UNCONSTRAINEDSIZE NS_MAXSIZE
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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 PRUint32 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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#define NS_INTRINSICSIZE NS_UNCONSTRAINEDSIZE
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#define NS_AUTOHEIGHT NS_UNCONSTRAINEDSIZE
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#define NS_AUTOMARGIN NS_UNCONSTRAINEDSIZE
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#define NS_AUTOOFFSET NS_UNCONSTRAINEDSIZE
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// NOTE: there are assumptions all over that these have the same value, namely NS_UNCONSTRAINEDSIZE
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// if any are changed to be a value other than NS_UNCONSTRAINEDSIZE
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// at least update AdjustComputedHeight/Width and test ad nauseum
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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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// 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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// 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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// 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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{
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}
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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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{
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InitOffsets(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 aCBWidth,
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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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* @return true if the margin is dependent on the containing block width
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*/
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bool ComputeMargin(nscoord aContainingBlockWidth);
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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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* @return true if the padding is dependent on the containing block width
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*/
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bool ComputePadding(nscoord aContainingBlockWidth, nsIAtom* aFrameType);
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protected:
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void InitOffsets(nscoord aContainingBlockWidth,
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nsIAtom* aFrameType,
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const nsMargin *aBorder = nsnull,
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const nsMargin *aPadding = nsnull);
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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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PRUint8 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 NULL 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 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 availableWidth;
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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 availableHeight;
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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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private:
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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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public:
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// Computed values for 'left/top/right/bottom' offsets. Only applies to
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// 'positioned' elements
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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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// 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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// 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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PRInt16 mReflowDepth;
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struct ReflowStateFlags {
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PRUint16 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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PRUint16 mNextInFlowUntouched:1; // nothing in the frame's next-in-flow (or its descendants)
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// is changing
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PRUint16 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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PRUint16 mBlinks:1; // Keep track of text-decoration: blink
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PRUint16 mHasClearance:1; // Block has clearance
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PRUint16 mAssumingHScrollbar:1; // parent frame is an nsIScrollableFrame and it
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// is assuming a horizontal scrollbar
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PRUint16 mAssumingVScrollbar:1; // parent frame is an nsIScrollableFrame and it
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// is assuming a vertical scrollbar
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PRUint16 mHResize:1; // Is frame (a) not dirty and (b) a
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// different width than before?
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PRUint16 mVResize:1; // Is frame (a) not dirty and (b) a
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// different height than before or
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// (potentially) in a context where
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// percent heights have a different
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// basis?
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PRUint16 mTableIsSplittable:1; // tables are splittable, this should happen only inside a page
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// and never insider a column frame
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PRUint16 mHeightDependsOnAncestorCell:1; // Does frame height depend on
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// an ancestor table-cell?
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PRUint16 mIsColumnBalancing:1; // nsColumnSetFrame is balancing columns
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PRUint16 mDummyParentReflowState:1; // a "fake" reflow state made
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// in order to be the parent
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// of a real one
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} mFlags;
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// Note: The copy constructor is written by the compiler automatically. You
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// can use that and then override specific values if you want, or you can
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// call Init as desired...
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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(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsRenderingContext* aRenderingContext,
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const nsSize& aAvailableSpace,
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PRUint32 aFlags = 0);
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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(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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// These two are used by absolute positioning code
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// to override default containing block w & h:
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nscoord aContainingBlockWidth = -1,
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nscoord aContainingBlockHeight = -1,
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bool aInit = true);
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// Values for |aFlags| passed to constructor
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enum {
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DUMMY_PARENT_REFLOW_STATE = (1<<0)
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};
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// This method initializes various data members. It is automatically
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// called by the various constructors
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void Init(nsPresContext* aPresContext,
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nscoord aContainingBlockWidth = -1,
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nscoord aContainingBlockHeight = -1,
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const nsMargin* aBorder = nsnull,
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const nsMargin* aPadding = nsnull);
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/**
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* Find the content width of the containing block of aReflowState
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*/
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static nscoord
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GetContainingBlockContentWidth(const nsHTMLReflowState* aReflowState);
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/**
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* Calculate the used line-height property. The return value will be >= 0.
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*/
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nscoord CalcLineHeight() const;
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/**
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* Same as CalcLineHeight() above, but doesn't need a reflow state.
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*
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* @param aBlockHeight The computed height of the content rect of the block
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* that the line should fill.
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* Only used with line-height:-moz-block-height.
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* NS_AUTOHEIGHT results in a normal line-height for
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* line-height:-moz-block-height.
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* @param aFontSizeInflation The result of the appropriate
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* nsLayoutUtils::FontSizeInflationFor call,
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* or 1.0 if during intrinsic size
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* calculation.
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*/
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static nscoord CalcLineHeight(nsStyleContext* aStyleContext,
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nscoord aBlockHeight,
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float aFontSizeInflation);
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void ComputeContainingBlockRectangle(nsPresContext* aPresContext,
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const nsHTMLReflowState* aContainingBlockRS,
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nscoord& aContainingBlockWidth,
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nscoord& aContainingBlockHeight);
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/**
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* Apply the mComputed(Min/Max)(Width/Height) values to the content
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* size computed so far. If a passed-in pointer is null, we skip
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* adjusting that dimension.
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*/
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void ApplyMinMaxConstraints(nscoord* aContentWidth, nscoord* aContentHeight) const;
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bool ShouldReflowAllKids() const {
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// Note that we could make a stronger optimization for mVResize if
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// we use it in a ShouldReflowChild test that replaces the current
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// checks of NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN, if it
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// were tested there along with NS_FRAME_CONTAINS_RELATIVE_HEIGHT.
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// This would need to be combined with a slight change in which
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// frames NS_FRAME_CONTAINS_RELATIVE_HEIGHT is marked on.
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return (frame->GetStateBits() & NS_FRAME_IS_DIRTY) ||
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mFlags.mHResize ||
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(mFlags.mVResize &&
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(frame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_HEIGHT));
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}
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nscoord ComputedWidth() const { return mComputedWidth; }
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// This method doesn't apply min/max computed widths to the value passed in.
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void SetComputedWidth(nscoord aComputedWidth);
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nscoord ComputedHeight() const { return mComputedHeight; }
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// This method doesn't apply min/max computed heights to the value passed in.
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void SetComputedHeight(nscoord aComputedHeight);
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void SetComputedHeightWithoutResettingResizeFlags(nscoord aComputedHeight) {
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// Viewport frames reset the computed height 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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mComputedHeight = aComputedHeight;
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}
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void SetTruncated(const nsHTMLReflowMetrics& aMetrics, nsReflowStatus* aStatus) const;
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bool WillReflowAgainForClearance() const {
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return mDiscoveredClearance && *mDiscoveredClearance;
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}
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// Compute the offsets for a relative position element
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static void ComputeRelativeOffsets(PRUint8 aCBDirection,
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nsIFrame* aFrame,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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nsMargin& aComputedOffsets);
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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* DisplayInitConstraintsEnter(nsIFrame* aFrame,
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nsHTMLReflowState* aState,
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nscoord aCBWidth,
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nscoord aCBHeight,
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const nsMargin* aBorder,
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const nsMargin* aPadding);
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static void DisplayInitConstraintsExit(nsIFrame* aFrame,
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nsHTMLReflowState* aState,
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void* aValue);
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static void* DisplayInitFrameTypeEnter(nsIFrame* aFrame,
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nsHTMLReflowState* aState);
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static void DisplayInitFrameTypeExit(nsIFrame* aFrame,
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nsHTMLReflowState* aState,
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void* aValue);
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#endif
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protected:
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void InitFrameType(nsIAtom* aFrameType);
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void InitCBReflowState();
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void InitResizeFlags(nsPresContext* aPresContext, nsIAtom* aFrameType);
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|
|
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void InitConstraints(nsPresContext* aPresContext,
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nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsMargin* aBorder,
|
|
const nsMargin* aPadding,
|
|
nsIAtom* aFrameType);
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|
|
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// Returns the nearest containing block or block frame (whether or not
|
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// it is a containing block) for the specified frame. Also returns
|
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// the left edge and width of the containing block's content area.
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|
// These are returned in the coordinate space of the containing block.
|
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nsIFrame* GetHypotheticalBoxContainer(nsIFrame* aFrame,
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|
nscoord& aCBLeftEdge,
|
|
nscoord& aCBWidth);
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|
|
|
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___ */
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|
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