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gecko-dev/layout/generic/ReflowInput.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* struct containing the input to nsIFrame::Reflow */
#ifndef mozilla_ReflowInput_h
#define mozilla_ReflowInput_h
#include "nsMargin.h"
#include "nsStyleConsts.h"
#include "nsIFrame.h"
#include "mozilla/Assertions.h"
#include "mozilla/Maybe.h"
#include <algorithm>
class gfxContext;
class nsFloatManager;
struct nsHypotheticalPosition;
class nsIPercentBSizeObserver;
class nsLineLayout;
class nsPlaceholderFrame;
class nsPresContext;
/**
* @return aValue clamped to [aMinValue, aMaxValue].
*
* @note This function needs to handle aMinValue > aMaxValue. In that case,
* aMinValue is returned.
* @see http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
* @see http://www.w3.org/TR/CSS21/visudet.html#min-max-heights
*/
template <class NumericType>
NumericType NS_CSS_MINMAX(NumericType aValue, NumericType aMinValue,
NumericType aMaxValue) {
NumericType result = aValue;
if (aMaxValue < result) result = aMaxValue;
if (aMinValue > result) result = aMinValue;
return result;
}
/**
* CSS Frame type. Included as part of the reflow input.
*/
typedef uint32_t nsCSSFrameType;
#define NS_CSS_FRAME_TYPE_UNKNOWN 0
#define NS_CSS_FRAME_TYPE_INLINE 1
#define NS_CSS_FRAME_TYPE_BLOCK 2 /* block-level in normal flow */
#define NS_CSS_FRAME_TYPE_FLOATING 3
#define NS_CSS_FRAME_TYPE_ABSOLUTE 4
#define NS_CSS_FRAME_TYPE_INTERNAL_TABLE \
5 /* row group frame, row frame, cell frame, ... */
/**
* Bit-flag that indicates whether the element is replaced. Applies to inline,
* block-level, floating, and absolutely positioned elements
*/
#define NS_CSS_FRAME_TYPE_REPLACED 0x08000
/**
* Bit-flag that indicates that the element is replaced and contains a block
* (eg some form controls). Applies to inline, block-level, floating, and
* absolutely positioned elements. Mutually exclusive with
* NS_CSS_FRAME_TYPE_REPLACED.
*/
#define NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK 0x10000
/**
* Helper macros for telling whether items are replaced
*/
#define NS_FRAME_IS_REPLACED_NOBLOCK(_ft) \
(NS_CSS_FRAME_TYPE_REPLACED == ((_ft)&NS_CSS_FRAME_TYPE_REPLACED))
#define NS_FRAME_IS_REPLACED(_ft) \
(NS_FRAME_IS_REPLACED_NOBLOCK(_ft) || \
NS_FRAME_IS_REPLACED_CONTAINS_BLOCK(_ft))
#define NS_FRAME_REPLACED(_ft) (NS_CSS_FRAME_TYPE_REPLACED | (_ft))
#define NS_FRAME_IS_REPLACED_CONTAINS_BLOCK(_ft) \
(NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK == \
((_ft)&NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK))
#define NS_FRAME_REPLACED_CONTAINS_BLOCK(_ft) \
(NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK | (_ft))
/**
* A macro to extract the type. Masks off the 'replaced' bit-flag
*/
#define NS_FRAME_GET_TYPE(_ft) \
((_ft) & \
~(NS_CSS_FRAME_TYPE_REPLACED | NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK))
namespace mozilla {
// A base class of ReflowInput that computes only the padding,
// border, and margin, since those values are needed more often.
struct SizeComputationInput {
public:
typedef mozilla::WritingMode WritingMode;
typedef mozilla::LogicalMargin LogicalMargin;
// The frame being reflowed.
nsIFrame* mFrame;
// Rendering context to use for measurement.
gfxContext* mRenderingContext;
const nsMargin& ComputedPhysicalMargin() const { return mComputedMargin; }
const nsMargin& ComputedPhysicalBorderPadding() const {
return mComputedBorderPadding;
}
const nsMargin& ComputedPhysicalPadding() const { return mComputedPadding; }
// We may need to eliminate the (few) users of these writable-reference
// accessors as part of migrating to logical coordinates.
nsMargin& ComputedPhysicalMargin() { return mComputedMargin; }
nsMargin& ComputedPhysicalBorderPadding() { return mComputedBorderPadding; }
nsMargin& ComputedPhysicalPadding() { return mComputedPadding; }
LogicalMargin ComputedLogicalMargin() const {
return LogicalMargin(mWritingMode, mComputedMargin);
}
LogicalMargin ComputedLogicalBorderPadding() const {
return LogicalMargin(mWritingMode, mComputedBorderPadding);
}
LogicalMargin ComputedLogicalPadding() const {
return LogicalMargin(mWritingMode, mComputedPadding);
}
void SetComputedLogicalMargin(mozilla::WritingMode aWM,
const LogicalMargin& aMargin) {
mComputedMargin = aMargin.GetPhysicalMargin(aWM);
}
void SetComputedLogicalMargin(const LogicalMargin& aMargin) {
SetComputedLogicalMargin(mWritingMode, aMargin);
}
void SetComputedLogicalBorderPadding(mozilla::WritingMode aWM,
const LogicalMargin& aMargin) {
mComputedBorderPadding = aMargin.GetPhysicalMargin(aWM);
}
void SetComputedLogicalBorderPadding(const LogicalMargin& aMargin) {
SetComputedLogicalBorderPadding(mWritingMode, aMargin);
}
void SetComputedLogicalPadding(mozilla::WritingMode aWM,
const LogicalMargin& aMargin) {
mComputedPadding = aMargin.GetPhysicalMargin(aWM);
}
void SetComputedLogicalPadding(const LogicalMargin& aMargin) {
SetComputedLogicalPadding(mWritingMode, aMargin);
}
WritingMode GetWritingMode() const { return mWritingMode; }
protected:
// cached copy of the frame's writing-mode, for logical coordinates
WritingMode mWritingMode;
// These are PHYSICAL coordinates (for now).
// Will probably become logical in due course.
// Computed margin values
nsMargin mComputedMargin;
// Cached copy of the border + padding values
nsMargin mComputedBorderPadding;
// Computed padding values
nsMargin mComputedPadding;
public:
// Callers using this constructor must call InitOffsets on their own.
SizeComputationInput(nsIFrame* aFrame, gfxContext* aRenderingContext)
: mFrame(aFrame),
mRenderingContext(aRenderingContext),
mWritingMode(aFrame->GetWritingMode()) {}
SizeComputationInput(nsIFrame* aFrame, gfxContext* aRenderingContext,
mozilla::WritingMode aContainingBlockWritingMode,
nscoord aContainingBlockISize);
struct ReflowInputFlags {
ReflowInputFlags() { memset(this, 0, sizeof(*this)); }
// used by tables to communicate special reflow (in process) to handle
// percent bsize frames inside cells which may not have computed bsizes
bool mSpecialBSizeReflow : 1;
// nothing in the frame's next-in-flow (or its descendants) is changing
bool mNextInFlowUntouched : 1;
// Is the current context at the top of a page? When true, we force
// something that's too tall for a page/column to fit anyway to avoid
// infinite loops.
bool mIsTopOfPage : 1;
// parent frame is an nsIScrollableFrame and it is assuming a horizontal
// scrollbar
bool mAssumingHScrollbar : 1;
// parent frame is an nsIScrollableFrame and it is assuming a vertical
// scrollbar
bool mAssumingVScrollbar : 1;
// Is frame a different inline-size than before?
bool mIsIResize : 1;
// Is frame (potentially) a different block-size than before?
// This includes cases where the block-size is 'auto' and the
// contents or width have changed.
bool mIsBResize : 1;
// Has this frame changed block-size in a way that affects
// block-size percentages on frames for which it is the containing
// block? This includes a change between 'auto' and a length that
// doesn't actually change the frame's block-size. It does not
// include cases where the block-size is 'auto' and the frame's
// contents have changed.
//
// In the current code, this is only true when mIsBResize is also
// true, although it doesn't necessarily need to be that way (e.g.,
// in the case of a frame changing from 'auto' to a length that
// produces the same height).
bool mIsBResizeForPercentages : 1;
// tables are splittable, this should happen only inside a page and never
// insider a column frame
bool mTableIsSplittable : 1;
// Does frame height depend on an ancestor table-cell?
bool mHeightDependsOnAncestorCell : 1;
// nsColumnSetFrame is balancing columns
bool mIsColumnBalancing : 1;
// True if ColumnSetWrapperFrame has a constrained block-size, and is going
// to consume all of its block-size in this fragment. This bit is passed to
// nsColumnSetFrame to determine whether to give up balancing and create
// overflow columns.
bool mColumnSetWrapperHasNoBSizeLeft : 1;
// nsFlexContainerFrame is reflowing this child to measure its intrinsic
// BSize.
bool mIsFlexContainerMeasuringBSize : 1;
// If this flag is set, the BSize of this frame should be considered
// indefinite for the purposes of percent resolution on child frames (we
// should behave as if ComputedBSize() were NS_UNCONSTRAINEDSIZE when doing
// percent resolution against this.ComputedBSize()). For example: flex
// items may have their ComputedBSize() resolved ahead-of-time by their
// flex container, and yet their BSize might have to be considered
// indefinite per https://drafts.csswg.org/css-flexbox/#definite-sizes
bool mTreatBSizeAsIndefinite : 1;
// a "fake" reflow input made in order to be the parent of a real one
bool mDummyParentReflowInput : 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.
bool mMustReflowPlaceholders : 1;
// stores the COMPUTE_SIZE_SHRINK_WRAP ctor flag
bool mShrinkWrap : 1;
// stores the COMPUTE_SIZE_USE_AUTO_BSIZE ctor flag
bool mUseAutoBSize : 1;
// the STATIC_POS_IS_CB_ORIGIN ctor flag
bool mStaticPosIsCBOrigin : 1;
// the I_CLAMP_MARGIN_BOX_MIN_SIZE ctor flag
bool mIClampMarginBoxMinSize : 1;
// the B_CLAMP_MARGIN_BOX_MIN_SIZE ctor flag
bool mBClampMarginBoxMinSize : 1;
// the I_APPLY_AUTO_MIN_SIZE ctor flag
bool mApplyAutoMinSize : 1;
// If set, the following two flags indicate that:
// (1) this frame is absolutely-positioned (or fixed-positioned).
// (2) this frame's static position depends on the CSS Box Alignment.
// (3) we do need to compute the static position, because the frame's
// {Inline and/or Block} offsets actually depend on it.
// When these bits are set, the offset values (IStart/IEnd, BStart/BEnd)
// represent the "start" edge of the frame's CSS Box Alignment container
// area, in that axis -- and these offsets need to be further-resolved
// (with CSS Box Alignment) after we know the OOF frame's size.
// NOTE: The "I" and "B" (for "Inline" and "Block") refer the axes of the
// *containing block's writing-mode*, NOT mFrame's own writing-mode. This
// is purely for convenience, since that's the writing-mode we're dealing
// with when we set & react to these bits.
bool mIOffsetsNeedCSSAlign : 1;
bool mBOffsetsNeedCSSAlign : 1;
// Are we somewhere inside an element with -webkit-line-clamp set?
// This flag is inherited into descendant ReflowInputs, but we don't bother
// resetting it to false when crossing over into a block descendant that
// -webkit-line-clamp skips over (such as a BFC).
bool mInsideLineClamp : 1;
// Is this a flex item, and should we add or remove a -webkit-line-clamp
// ellipsis on a descendant line? It's possible for this flag to be true
// when mInsideLineClamp is false if we previously had a numeric
// -webkit-line-clamp value, but now have 'none' and we need to find the
// line with the ellipsis flag and clear it.
// This flag is not inherited into descendant ReflowInputs.
bool mApplyLineClamp : 1;
// Is this frame or one of its ancestors being reflowed in a different
// continuation than the one in which it was previously reflowed? In
// other words, has it moved to a different column or page than it was in
// the previous reflow?
//
// FIXME: For now, we only ensure that this is set correctly for blocks.
// This is okay because the only thing that uses it only cares about
// whether there's been a fragment change within the same block formatting
// context.
bool mMovedBlockFragments : 1;
};
#ifdef DEBUG
// Reflow trace methods. Defined in nsFrame.cpp so they have access
// to the display-reflow infrastructure.
static void* DisplayInitOffsetsEnter(nsIFrame* aFrame,
SizeComputationInput* aState,
nscoord aPercentBasis,
WritingMode aCBWritingMode,
const nsMargin* aBorder,
const nsMargin* aPadding);
static void DisplayInitOffsetsExit(nsIFrame* aFrame,
SizeComputationInput* aState,
void* aValue);
#endif
private:
/**
* Computes margin values from the specified margin style information, and
* fills in the mComputedMargin member.
*
* @param aWM Writing mode of the containing block
* @param aPercentBasis
* Inline size of the containing block (in its own writing mode), to use
* for resolving percentage margin values in the inline and block axes.
* @return true if the margin is dependent on the containing block size.
*/
bool ComputeMargin(mozilla::WritingMode aWM, nscoord aPercentBasis);
/**
* Computes padding values from the specified padding style information, and
* fills in the mComputedPadding member.
*
* @param aWM Writing mode of the containing block
* @param aPercentBasis
* Inline size of the containing block (in its own writing mode), to use
* for resolving percentage padding values in the inline and block axes.
* @return true if the padding is dependent on the containing block size.
*/
bool ComputePadding(mozilla::WritingMode aWM, nscoord aPercentBasis,
mozilla::LayoutFrameType aFrameType);
protected:
void InitOffsets(mozilla::WritingMode aWM, nscoord aPercentBasis,
mozilla::LayoutFrameType aFrameType, ReflowInputFlags aFlags,
const nsMargin* aBorder = nullptr,
const nsMargin* aPadding = nullptr,
const nsStyleDisplay* aDisplay = nullptr);
/*
* Convert StyleSize or StyleMaxSize to nscoord when percentages depend on the
* inline size of the containing block, and enumerated values are for inline
* size, min-inline-size, or max-inline-size. Does not handle auto inline
* sizes.
*/
template <typename SizeOrMaxSize>
inline nscoord ComputeISizeValue(nscoord aContainingBlockISize,
nscoord aContentEdgeToBoxSizing,
nscoord aBoxSizingToMarginEdge,
const SizeOrMaxSize&) const;
// same as previous, but using mComputedBorderPadding, mComputedPadding,
// and mComputedMargin
template <typename SizeOrMaxSize>
inline nscoord ComputeISizeValue(nscoord aContainingBlockISize,
mozilla::StyleBoxSizing aBoxSizing,
const SizeOrMaxSize&) const;
nscoord ComputeBSizeValue(nscoord aContainingBlockBSize,
mozilla::StyleBoxSizing aBoxSizing,
const mozilla::LengthPercentage& aCoord) const;
};
/**
* State passed to a frame during reflow or intrinsic size calculation.
*
* XXX Refactor so only a base class (nsSizingState?) is used for intrinsic
* size calculation.
*
* @see nsIFrame#Reflow()
*/
struct ReflowInput : public SizeComputationInput {
// the reflow inputs are linked together. this is the pointer to the
// parent's reflow input
const ReflowInput* mParentReflowInput = nullptr;
// A non-owning pointer to the float manager associated with this area,
// which points to the object owned by nsAutoFloatManager::mNew.
nsFloatManager* mFloatManager = nullptr;
// LineLayout object (only for inline reflow; set to nullptr otherwise)
nsLineLayout* mLineLayout = nullptr;
// The appropriate reflow input for the containing block (for
// percentage widths, etc.) of this reflow input's frame. It will be setup
// properly in InitCBReflowInput().
const ReflowInput* mCBReflowInput = nullptr;
// The type of frame, from css's perspective. This value is
// initialized by the Init method below.
nsCSSFrameType mFrameType = NS_CSS_FRAME_TYPE_UNKNOWN;
// The amount the in-flow position of the block is moving vertically relative
// to its previous in-flow position (i.e. the amount the line containing the
// block is moving).
// This should be zero for anything which is not a block outside, and it
// should be zero for anything which has a non-block parent.
// The intended use of this value is to allow the accurate determination
// of the potential impact of a float
// This takes on an arbitrary value the first time a block is reflowed
nscoord mBlockDelta = 0;
// If a ReflowInput finds itself initialized with an unconstrained
// inline-size, it will look up its parentReflowInput chain for a reflow input
// with an orthogonal writing mode and a non-NS_UNCONSTRAINEDSIZE value for
// orthogonal limit; when it finds such a reflow input, it will use its
// orthogonal-limit value to constrain inline-size.
// This is initialized to NS_UNCONSTRAINEDSIZE (so it will be ignored),
// but reset to a suitable value for the reflow root by PresShell.
nscoord mOrthogonalLimit = NS_UNCONSTRAINEDSIZE;
// Accessors for the private fields below. Forcing all callers to use these
// will allow us to introduce logical-coordinate versions and gradually
// change clients from physical to logical as needed; and potentially switch
// the internal fields from physical to logical coordinates in due course,
// while maintaining compatibility with not-yet-updated code.
nscoord AvailableWidth() const { return mAvailableWidth; }
nscoord AvailableHeight() const { return mAvailableHeight; }
nscoord ComputedWidth() const { return mComputedWidth; }
nscoord ComputedHeight() const { return mComputedHeight; }
nscoord ComputedMinWidth() const { return mComputedMinWidth; }
nscoord ComputedMaxWidth() const { return mComputedMaxWidth; }
nscoord ComputedMinHeight() const { return mComputedMinHeight; }
nscoord ComputedMaxHeight() const { return mComputedMaxHeight; }
nscoord& AvailableWidth() { return mAvailableWidth; }
nscoord& AvailableHeight() { return mAvailableHeight; }
nscoord& ComputedWidth() { return mComputedWidth; }
nscoord& ComputedHeight() { return mComputedHeight; }
nscoord& ComputedMinWidth() { return mComputedMinWidth; }
nscoord& ComputedMaxWidth() { return mComputedMaxWidth; }
nscoord& ComputedMinHeight() { return mComputedMinHeight; }
nscoord& ComputedMaxHeight() { return mComputedMaxHeight; }
// ISize and BSize are logical-coordinate dimensions:
// ISize is the size in the writing mode's inline direction (which equates to
// width in horizontal writing modes, height in vertical ones), and BSize is
// the size in the block-progression direction.
nscoord AvailableISize() const {
return mWritingMode.IsVertical() ? mAvailableHeight : mAvailableWidth;
}
nscoord AvailableBSize() const {
return mWritingMode.IsVertical() ? mAvailableWidth : mAvailableHeight;
}
nscoord ComputedISize() const {
return mWritingMode.IsVertical() ? mComputedHeight : mComputedWidth;
}
nscoord ComputedBSize() const {
return mWritingMode.IsVertical() ? mComputedWidth : mComputedHeight;
}
nscoord ComputedMinISize() const {
return mWritingMode.IsVertical() ? mComputedMinHeight : mComputedMinWidth;
}
nscoord ComputedMaxISize() const {
return mWritingMode.IsVertical() ? mComputedMaxHeight : mComputedMaxWidth;
}
nscoord ComputedMinBSize() const {
return mWritingMode.IsVertical() ? mComputedMinWidth : mComputedMinHeight;
}
nscoord ComputedMaxBSize() const {
return mWritingMode.IsVertical() ? mComputedMaxWidth : mComputedMaxHeight;
}
nscoord& AvailableISize() {
return mWritingMode.IsVertical() ? mAvailableHeight : mAvailableWidth;
}
nscoord& AvailableBSize() {
return mWritingMode.IsVertical() ? mAvailableWidth : mAvailableHeight;
}
nscoord& ComputedISize() {
return mWritingMode.IsVertical() ? mComputedHeight : mComputedWidth;
}
nscoord& ComputedBSize() {
return mWritingMode.IsVertical() ? mComputedWidth : mComputedHeight;
}
nscoord& ComputedMinISize() {
return mWritingMode.IsVertical() ? mComputedMinHeight : mComputedMinWidth;
}
nscoord& ComputedMaxISize() {
return mWritingMode.IsVertical() ? mComputedMaxHeight : mComputedMaxWidth;
}
nscoord& ComputedMinBSize() {
return mWritingMode.IsVertical() ? mComputedMinWidth : mComputedMinHeight;
}
nscoord& ComputedMaxBSize() {
return mWritingMode.IsVertical() ? mComputedMaxWidth : mComputedMaxHeight;
}
mozilla::LogicalSize AvailableSize() const {
return mozilla::LogicalSize(mWritingMode, AvailableISize(),
AvailableBSize());
}
mozilla::LogicalSize ComputedSize() const {
return mozilla::LogicalSize(mWritingMode, ComputedISize(), ComputedBSize());
}
mozilla::LogicalSize ComputedMinSize() const {
return mozilla::LogicalSize(mWritingMode, ComputedMinISize(),
ComputedMinBSize());
}
mozilla::LogicalSize ComputedMaxSize() const {
return mozilla::LogicalSize(mWritingMode, ComputedMaxISize(),
ComputedMaxBSize());
}
mozilla::LogicalSize AvailableSize(mozilla::WritingMode aWM) const {
return AvailableSize().ConvertTo(aWM, mWritingMode);
}
mozilla::LogicalSize ComputedSize(mozilla::WritingMode aWM) const {
return ComputedSize().ConvertTo(aWM, mWritingMode);
}
mozilla::LogicalSize ComputedMinSize(mozilla::WritingMode aWM) const {
return ComputedMinSize().ConvertTo(aWM, mWritingMode);
}
mozilla::LogicalSize ComputedMaxSize(mozilla::WritingMode aWM) const {
return ComputedMaxSize().ConvertTo(aWM, mWritingMode);
}
mozilla::LogicalSize ComputedSizeWithPadding() const {
mozilla::WritingMode wm = GetWritingMode();
return mozilla::LogicalSize(
wm, ComputedISize() + ComputedLogicalPadding().IStartEnd(wm),
ComputedBSize() + ComputedLogicalPadding().BStartEnd(wm));
}
mozilla::LogicalSize ComputedSizeWithPadding(mozilla::WritingMode aWM) const {
return ComputedSizeWithPadding().ConvertTo(aWM, GetWritingMode());
}
mozilla::LogicalSize ComputedSizeWithBorderPadding() const {
mozilla::WritingMode wm = GetWritingMode();
return mozilla::LogicalSize(
wm, ComputedISize() + ComputedLogicalBorderPadding().IStartEnd(wm),
ComputedBSize() + ComputedLogicalBorderPadding().BStartEnd(wm));
}
mozilla::LogicalSize ComputedSizeWithBorderPadding(
mozilla::WritingMode aWM) const {
return ComputedSizeWithBorderPadding().ConvertTo(aWM, GetWritingMode());
}
mozilla::LogicalSize ComputedSizeWithMarginBorderPadding() const {
mozilla::WritingMode wm = GetWritingMode();
return mozilla::LogicalSize(
wm,
ComputedISize() + ComputedLogicalMargin().IStartEnd(wm) +
ComputedLogicalBorderPadding().IStartEnd(wm),
ComputedBSize() + ComputedLogicalMargin().BStartEnd(wm) +
ComputedLogicalBorderPadding().BStartEnd(wm));
}
mozilla::LogicalSize ComputedSizeWithMarginBorderPadding(
mozilla::WritingMode aWM) const {
return ComputedSizeWithMarginBorderPadding().ConvertTo(aWM,
GetWritingMode());
}
nsSize ComputedPhysicalSize() const {
return nsSize(ComputedWidth(), ComputedHeight());
}
// XXX this will need to change when we make mComputedOffsets logical;
// we won't be able to return a reference for the physical offsets
const nsMargin& ComputedPhysicalOffsets() const { return mComputedOffsets; }
nsMargin& ComputedPhysicalOffsets() { return mComputedOffsets; }
const LogicalMargin ComputedLogicalOffsets() const {
return LogicalMargin(mWritingMode, mComputedOffsets);
}
void SetComputedLogicalOffsets(const LogicalMargin& aOffsets) {
mComputedOffsets = aOffsets.GetPhysicalMargin(mWritingMode);
}
// Return the state's computed size including border-padding, with
// unconstrained dimensions replaced by zero.
nsSize ComputedSizeAsContainerIfConstrained() const {
const nscoord wd = ComputedWidth();
const nscoord ht = ComputedHeight();
return nsSize(wd == NS_UNCONSTRAINEDSIZE
? 0
: wd + ComputedPhysicalBorderPadding().LeftRight(),
ht == NS_UNCONSTRAINEDSIZE
? 0
: ht + ComputedPhysicalBorderPadding().TopBottom());
}
private:
// the available width in which to reflow the frame. The space
// represents the amount of room for the frame's margin, border,
// padding, and content area. The frame size you choose should fit
// within the available width.
nscoord mAvailableWidth = 0;
// A value of NS_UNCONSTRAINEDSIZE for the available height means
// you can choose whatever size you want. In galley mode the
// available height is always NS_UNCONSTRAINEDSIZE, and only page
// mode or multi-column layout involves a constrained height. The
// element's the top border and padding, and content, must fit. If the
// element is complete after reflow then its bottom border, padding
// and margin (and similar for its complete ancestors) will need to
// fit in this height.
nscoord mAvailableHeight = 0;
// The computed width specifies the frame's content area width, and it does
// not apply to inline non-replaced elements
//
// For replaced inline frames, a value of NS_UNCONSTRAINEDSIZE means you
// should use your intrinsic width as the computed width
//
// For block-level frames, the computed width is based on the width of the
// containing block, the margin/border/padding areas, and the min/max width.
MOZ_INIT_OUTSIDE_CTOR
nscoord mComputedWidth;
// The computed height specifies the frame's content height, and it does
// not apply to inline non-replaced elements
//
// For replaced inline frames, a value of NS_UNCONSTRAINEDSIZE means you
// should use your intrinsic height as the computed height
//
// For non-replaced block-level frames in the flow and floated, a value of
// NS_UNCONSTRAINEDSIZE means you choose a height to shrink wrap around the
// normal flow child frames. The height must be within the limit of the
// min/max height if there is such a limit
//
// For replaced block-level frames, a value of NS_UNCONSTRAINEDSIZE
// means you use your intrinsic height as the computed height
MOZ_INIT_OUTSIDE_CTOR
nscoord mComputedHeight;
// Computed values for 'left/top/right/bottom' offsets. Only applies to
// 'positioned' elements. These are PHYSICAL coordinates (for now).
nsMargin mComputedOffsets;
// Computed values for 'min-width/max-width' and 'min-height/max-height'
// XXXldb The width ones here should go; they should be needed only
// internally, except for nsComboboxDisplayFrame, which still wants to honor
// min-inline-size even though it wants to trump inline-size.
MOZ_INIT_OUTSIDE_CTOR
nscoord mComputedMinWidth, mComputedMaxWidth;
MOZ_INIT_OUTSIDE_CTOR
nscoord mComputedMinHeight, mComputedMaxHeight;
public:
// Our saved containing block dimensions.
LogicalSize mContainingBlockSize = LogicalSize(mWritingMode);
// Cached pointers to the various style structs used during initialization.
const nsStyleDisplay* mStyleDisplay = nullptr;
const nsStyleVisibility* mStyleVisibility = nullptr;
const nsStylePosition* mStylePosition = nullptr;
const nsStyleBorder* mStyleBorder = nullptr;
const nsStyleMargin* mStyleMargin = nullptr;
const nsStylePadding* mStylePadding = nullptr;
const nsStyleText* mStyleText = nullptr;
bool IsFloating() const;
mozilla::StyleDisplay GetDisplay() const;
// a frame (e.g. nsTableCellFrame) which may need to generate a special
// reflow for percent bsize calculations
nsIPercentBSizeObserver* mPercentBSizeObserver = nullptr;
// CSS margin collapsing sometimes requires us to reflow
// optimistically assuming that margins collapse to see if clearance
// is required. When we discover that clearance is required, we
// store the frame in which clearance was discovered to the location
// requested here.
nsIFrame** mDiscoveredClearance = nullptr;
ReflowInputFlags mFlags;
// This value keeps track of how deeply nested a given reflow input
// is from the top of the frame tree.
int16_t mReflowDepth = 0;
// Logical and physical accessors for the resize flags. All users should go
// via these accessors, so that in due course we can change the storage from
// physical to logical.
bool IsHResize() const {
return mWritingMode.IsVertical() ? mFlags.mIsBResize : mFlags.mIsIResize;
}
bool IsVResize() const {
return mWritingMode.IsVertical() ? mFlags.mIsIResize : mFlags.mIsBResize;
}
bool IsIResize() const { return mFlags.mIsIResize; }
bool IsBResize() const { return mFlags.mIsBResize; }
bool IsBResizeForWM(mozilla::WritingMode aWM) const {
return aWM.IsOrthogonalTo(mWritingMode) ? mFlags.mIsIResize
: mFlags.mIsBResize;
}
bool IsBResizeForPercentagesForWM(mozilla::WritingMode aWM) const {
// This uses the relatively-accurate mIsBResizeForPercentages flag
// when the writing modes are parallel, and is a bit more
// pessimistic when orthogonal.
return !aWM.IsOrthogonalTo(mWritingMode) ? mFlags.mIsBResizeForPercentages
: IsIResize();
}
void SetHResize(bool aValue) {
if (mWritingMode.IsVertical()) {
mFlags.mIsBResize = aValue;
} else {
mFlags.mIsIResize = aValue;
}
}
void SetVResize(bool aValue) {
if (mWritingMode.IsVertical()) {
mFlags.mIsIResize = aValue;
} else {
mFlags.mIsBResize = aValue;
}
}
void SetIResize(bool aValue) { mFlags.mIsIResize = aValue; }
void SetBResize(bool aValue) { mFlags.mIsBResize = aValue; }
// 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 input.
*
* @param aPresContext Must be equal to aFrame->PresContext().
* @param aFrame The frame for whose reflow input is being constructed.
* @param aRenderingContext The rendering context to be used for measurements.
* @param aAvailableSpace The available space to reflow aFrame (in aFrame's
* writing-mode). See comments for mAvailableHeight and mAvailableWidth
* members for more information.
* @param aFlags A set of flags used for additional boolean parameters (see
* below).
*/
ReflowInput(nsPresContext* aPresContext, nsIFrame* aFrame,
gfxContext* aRenderingContext,
const mozilla::LogicalSize& aAvailableSpace, uint32_t aFlags = 0);
/**
* Initialize a reflow input for a child frame's reflow. Some parts of the
* state are copied from the parent's reflow input. The remainder is computed.
*
* @param aPresContext Must be equal to aFrame->PresContext().
* @param aParentReflowInput A reference to an ReflowInput object that
* is to be the parent of this object.
* @param aFrame The frame for whose reflow input is being constructed.
* @param aAvailableSpace The available space to reflow aFrame (in aFrame's
* writing-mode). See comments for mAvailableHeight and mAvailableWidth
* members for more information.
* @param aContainingBlockSize An optional size, in app units, specifying
* the containing block size to use instead of the default which is
* computed by ComputeContainingBlockRectangle().
* @param aFlags A set of flags used for additional boolean parameters (see
* below).
*/
ReflowInput(nsPresContext* aPresContext,
const ReflowInput& aParentReflowInput, nsIFrame* aFrame,
const mozilla::LogicalSize& aAvailableSpace,
const mozilla::Maybe<mozilla::LogicalSize>& aContainingBlockSize =
mozilla::Nothing(),
uint32_t aFlags = 0);
// Values for |aFlags| passed to constructor
enum {
// Indicates that the parent of this reflow input is "fake" (see
// mDummyParentReflowInput in mFlags).
DUMMY_PARENT_REFLOW_INPUT = (1 << 0),
// Indicates that the calling function will initialize the reflow input, and
// that the constructor should not call Init().
CALLER_WILL_INIT = (1 << 1),
// The caller wants shrink-wrap behavior (i.e. ComputeSizeFlags::eShrinkWrap
// will be passed to ComputeSize()).
COMPUTE_SIZE_SHRINK_WRAP = (1 << 2),
// The caller wants 'auto' bsize behavior (ComputeSizeFlags::eUseAutoBSize
// will be be passed to ComputeSize()).
COMPUTE_SIZE_USE_AUTO_BSIZE = (1 << 3),
// The caller wants the abs.pos. static-position resolved at the origin of
// the containing block, i.e. at LogicalPoint(0, 0). (Note that this
// doesn't necessarily mean that (0, 0) is the *correct* static position
// for the frame in question.)
// @note In a Grid container's masonry axis we'll always use
// the placeholder's position in that axis regardless of this flag.
STATIC_POS_IS_CB_ORIGIN = (1 << 4),
// Pass ComputeSizeFlags::eIClampMarginBoxMinSize to ComputeSize().
I_CLAMP_MARGIN_BOX_MIN_SIZE = (1 << 5),
// Pass ComputeSizeFlags::eBClampMarginBoxMinSize to ComputeSize().
B_CLAMP_MARGIN_BOX_MIN_SIZE = (1 << 6),
// Pass ComputeSizeFlags::eIApplyAutoMinSize to ComputeSize().
I_APPLY_AUTO_MIN_SIZE = (1 << 7),
};
// This method initializes various data members. It is automatically
// called by the various constructors
void Init(nsPresContext* aPresContext,
const mozilla::Maybe<mozilla::LogicalSize>& aContainingBlockSize =
mozilla::Nothing(),
const nsMargin* aBorder = nullptr,
const nsMargin* aPadding = nullptr);
/**
* Find the content isize of our containing block for the given writing mode,
* which need not be the same as the reflow input's mode.
*/
nscoord GetContainingBlockContentISize(
mozilla::WritingMode aWritingMode) const;
/**
* 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 input.
*
* @param aBlockBSize The computed block size of the content rect of the block
* that the line should fill.
* Only used with line-height:-moz-block-height.
* NS_UNCONSTRAINEDSIZE 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(nsIContent* aContent,
ComputedStyle* aComputedStyle,
nsPresContext* aPresContext,
nscoord aBlockBSize, float aFontSizeInflation);
mozilla::LogicalSize ComputeContainingBlockRectangle(
nsPresContext* aPresContext, const ReflowInput* aContainingBlockRI) const;
/**
* 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)ISize constraints to the content
* size computed so far.
*/
nscoord ApplyMinMaxISize(nscoord aISize) const {
if (NS_UNCONSTRAINEDSIZE != ComputedMaxISize()) {
aISize = std::min(aISize, ComputedMaxISize());
}
return std::max(aISize, ComputedMinISize());
}
/**
* 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;
}
/**
* Apply the mComputed(Min/Max)BSize constraints to the content
* size computed so far.
*
* @param aBSize The block-size that we've computed an to which we want to
* apply min/max constraints.
* @param aConsumed The amount of the computed block-size that was consumed by
* our prev-in-flows.
*/
nscoord ApplyMinMaxBSize(nscoord aBSize, nscoord aConsumed = 0) const {
aBSize += aConsumed;
if (NS_UNCONSTRAINEDSIZE != ComputedMaxBSize()) {
aBSize = std::min(aBSize, ComputedMaxBSize());
}
if (NS_UNCONSTRAINEDSIZE != ComputedMinBSize()) {
aBSize = std::max(aBSize, ComputedMinBSize());
}
return aBSize - aConsumed;
}
bool ShouldReflowAllKids() const {
// Note that we could make a stronger optimization for IsBResize 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_BSIZE.
// This would need to be combined with a slight change in which
// frames NS_FRAME_CONTAINS_RELATIVE_BSIZE is marked on.
return (mFrame->GetStateBits() & NS_FRAME_IS_DIRTY) || IsIResize() ||
(IsBResize() &&
(mFrame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_BSIZE));
}
// 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 SetComputedISize(nscoord aComputedISize) {
if (mWritingMode.IsVertical()) {
SetComputedHeight(aComputedISize);
} else {
SetComputedWidth(aComputedISize);
}
}
void SetComputedBSize(nscoord aComputedBSize) {
if (mWritingMode.IsVertical()) {
SetComputedWidth(aComputedBSize);
} else {
SetComputedHeight(aComputedBSize);
}
}
void SetComputedBSizeWithoutResettingResizeFlags(nscoord aComputedBSize) {
// Viewport frames reset the computed block size on a copy of their reflow
// input 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 isize is pointless.
ComputedBSize() = aComputedBSize;
}
void SetTruncated(const ReflowOutput& aMetrics,
nsReflowStatus* aStatus) const;
bool WillReflowAgainForClearance() const {
return mDiscoveredClearance && *mDiscoveredClearance;
}
// Compute the offsets for a relative position element
static void ComputeRelativeOffsets(mozilla::WritingMode aWM, nsIFrame* aFrame,
const mozilla::LogicalSize& aCBSize,
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(mFrame, ComputedPhysicalOffsets(), aPosition);
}
static void ApplyRelativePositioning(
nsIFrame* aFrame, mozilla::WritingMode aWritingMode,
const mozilla::LogicalMargin& aComputedOffsets,
mozilla::LogicalPoint* aPosition, const nsSize& aContainerSize) {
// Subtract the size of the frame from the container size that we
// use for converting between the logical and physical origins of
// the frame. This accounts for the fact that logical origins in RTL
// coordinate systems are at the top right of the frame instead of
// the top left.
nsSize frameSize = aFrame->GetSize();
nsPoint pos =
aPosition->GetPhysicalPoint(aWritingMode, aContainerSize - frameSize);
ApplyRelativePositioning(
aFrame, aComputedOffsets.GetPhysicalMargin(aWritingMode), &pos);
*aPosition =
mozilla::LogicalPoint(aWritingMode, pos, aContainerSize - frameSize);
}
void ApplyRelativePositioning(mozilla::LogicalPoint* aPosition,
const nsSize& aContainerSize) const {
ApplyRelativePositioning(mFrame, mWritingMode, ComputedLogicalOffsets(),
aPosition, aContainerSize);
}
#ifdef DEBUG
// Reflow trace methods. Defined in nsFrame.cpp so they have access
// to the display-reflow infrastructure.
static void* DisplayInitConstraintsEnter(nsIFrame* aFrame,
ReflowInput* aState,
nscoord aCBISize, nscoord aCBBSize,
const nsMargin* aBorder,
const nsMargin* aPadding);
static void DisplayInitConstraintsExit(nsIFrame* aFrame, ReflowInput* aState,
void* aValue);
static void* DisplayInitFrameTypeEnter(nsIFrame* aFrame, ReflowInput* aState);
static void DisplayInitFrameTypeExit(nsIFrame* aFrame, ReflowInput* aState,
void* aValue);
#endif
protected:
void InitFrameType(LayoutFrameType aFrameType);
void InitCBReflowInput();
void InitResizeFlags(nsPresContext* aPresContext,
mozilla::LayoutFrameType aFrameType);
void InitDynamicReflowRoot();
void InitConstraints(
nsPresContext* aPresContext,
const mozilla::Maybe<mozilla::LogicalSize>& aContainingBlockSize,
const nsMargin* aBorder, const nsMargin* aPadding,
mozilla::LayoutFrameType aFrameType);
// Returns the nearest containing block or block frame (whether or not
// it is a containing block) for the specified frame. Also returns
// the inline-start edge and logical size of the containing block's
// content area.
// These are returned in the coordinate space of the containing block.
nsIFrame* GetHypotheticalBoxContainer(nsIFrame* aFrame,
nscoord& aCBIStartEdge,
mozilla::LogicalSize& aCBSize) const;
// Calculate a "hypothetical box" position where the placeholder frame
// (for a position:fixed/absolute element) would have been placed if it were
// positioned statically. The hypothetical box position will have a writing
// mode with the same block direction as the absolute containing block
// (aCBReflowInput->frame), though it may differ in inline direction.
void CalculateHypotheticalPosition(nsPresContext* aPresContext,
nsPlaceholderFrame* aPlaceholderFrame,
const ReflowInput* aCBReflowInput,
nsHypotheticalPosition& aHypotheticalPos,
mozilla::LayoutFrameType aFrameType) const;
void InitAbsoluteConstraints(nsPresContext* aPresContext,
const ReflowInput* aCBReflowInput,
const mozilla::LogicalSize& aContainingBlockSize,
mozilla::LayoutFrameType 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(const mozilla::LogicalSize& aContainingBlockSize);
// aInsideBoxSizing returns the part of the padding, border, and margin
// in the aAxis dimension that goes inside the edge given by box-sizing;
// aOutsideBoxSizing returns the rest.
void CalculateBorderPaddingMargin(mozilla::LogicalAxis aAxis,
nscoord aContainingBlockSize,
nscoord* aInsideBoxSizing,
nscoord* aOutsideBoxSizing) const;
void CalculateBlockSideMargins(LayoutFrameType aFrameType);
};
} // namespace mozilla
#endif // mozilla_ReflowInput_h
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