зеркало из https://github.com/mozilla/gecko-dev.git
468 строки
20 KiB
C++
468 строки
20 KiB
C++
/* -*- 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/. */
|
|
|
|
/* rendering object for CSS "display: flex" and "display: -webkit-box" */
|
|
|
|
#ifndef nsFlexContainerFrame_h___
|
|
#define nsFlexContainerFrame_h___
|
|
|
|
#include "nsContainerFrame.h"
|
|
#include "mozilla/UniquePtr.h"
|
|
#include "mozilla/dom/FlexBinding.h"
|
|
|
|
namespace mozilla {
|
|
template <class T>
|
|
class LinkedList;
|
|
class LogicalPoint;
|
|
class PresShell;
|
|
} // namespace mozilla
|
|
|
|
nsContainerFrame* NS_NewFlexContainerFrame(mozilla::PresShell* aPresShell,
|
|
mozilla::ComputedStyle* aStyle);
|
|
|
|
/**
|
|
* These structures are used to capture data during reflow to be
|
|
* extracted by devtools via Chrome APIs. The structures are only
|
|
* created when requested in GetFlexFrameWithComputedInfo(), and
|
|
* the structures are attached to the nsFlexContainerFrame via the
|
|
* FlexContainerInfo property.
|
|
*/
|
|
struct ComputedFlexItemInfo {
|
|
nsCOMPtr<nsINode> mNode;
|
|
nsRect mFrameRect;
|
|
/**
|
|
* mMainBaseSize is a measure of the size of the item in the main
|
|
* axis before the flex sizing algorithm is applied. In the spec,
|
|
* this is called "flex base size", but we use this name to connect
|
|
* the value to the other main axis sizes.
|
|
*/
|
|
nscoord mMainBaseSize;
|
|
/**
|
|
* mMainDeltaSize is the amount that the flex sizing algorithm
|
|
* adds to the mMainBaseSize, before clamping to mMainMinSize and
|
|
* mMainMaxSize. This can be thought of as the amount by which the
|
|
* flex layout algorithm "wants" to shrink or grow the item, and
|
|
* would do, if it was unconstrained. Since the flex sizing
|
|
* algorithm proceeds linearly, the mMainDeltaSize for an item only
|
|
* respects the resolved size of items already frozen.
|
|
*/
|
|
nscoord mMainDeltaSize;
|
|
nscoord mMainMinSize;
|
|
nscoord mMainMaxSize;
|
|
nscoord mCrossMinSize;
|
|
nscoord mCrossMaxSize;
|
|
mozilla::dom::FlexItemClampState mClampState;
|
|
};
|
|
|
|
struct ComputedFlexLineInfo {
|
|
nsTArray<ComputedFlexItemInfo> mItems;
|
|
nscoord mCrossStart;
|
|
nscoord mCrossSize;
|
|
nscoord mFirstBaselineOffset;
|
|
nscoord mLastBaselineOffset;
|
|
mozilla::dom::FlexLineGrowthState mGrowthState;
|
|
};
|
|
|
|
struct ComputedFlexContainerInfo {
|
|
nsTArray<ComputedFlexLineInfo> mLines;
|
|
mozilla::dom::FlexPhysicalDirection mMainAxisDirection;
|
|
mozilla::dom::FlexPhysicalDirection mCrossAxisDirection;
|
|
};
|
|
|
|
/**
|
|
* This is the rendering object used for laying out elements with
|
|
* "display: flex" or "display: inline-flex".
|
|
*
|
|
* We also use this class for elements with "display: -webkit-box" or
|
|
* "display: -webkit-inline-box" (but not "-moz-box" / "-moz-inline-box" --
|
|
* those are rendered with old-school XUL frame classes).
|
|
*
|
|
* Note: we represent the -webkit-box family of properties (-webkit-box-orient,
|
|
* -webkit-box-flex, etc.) as aliases for their -moz equivalents. And for
|
|
* -webkit-{inline-}box containers, nsFlexContainerFrame will honor those
|
|
* "legacy" properties for alignment/flexibility/etc. *instead of* honoring the
|
|
* modern flexbox & alignment properties. For brevity, many comments in
|
|
* nsFlexContainerFrame.cpp simply refer to these properties using their
|
|
* "-webkit" versions, since we're mostly expecting to encounter them in that
|
|
* form. (Technically, the "-moz" versions of these properties *can* influence
|
|
* layout here as well (since that's what the -webkit versions are aliased to)
|
|
* -- but only inside of a "display:-webkit-{inline-}box" container.)
|
|
*/
|
|
class nsFlexContainerFrame final : public nsContainerFrame {
|
|
public:
|
|
NS_DECL_FRAMEARENA_HELPERS(nsFlexContainerFrame)
|
|
NS_DECL_QUERYFRAME
|
|
|
|
// Factory method:
|
|
friend nsContainerFrame* NS_NewFlexContainerFrame(
|
|
mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
|
|
|
|
// Forward-decls of helper classes
|
|
class FlexItem;
|
|
class FlexLine;
|
|
class FlexboxAxisTracker;
|
|
struct StrutInfo;
|
|
class CachedMeasuringReflowResult;
|
|
|
|
// nsIFrame overrides
|
|
void Init(nsIContent* aContent, nsContainerFrame* aParent,
|
|
nsIFrame* aPrevInFlow) override;
|
|
|
|
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists) override;
|
|
|
|
void MarkIntrinsicISizesDirty() override;
|
|
|
|
void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
|
|
const ReflowInput& aReflowInput,
|
|
nsReflowStatus& aStatus) override;
|
|
|
|
nscoord GetMinISize(gfxContext* aRenderingContext) override;
|
|
nscoord GetPrefISize(gfxContext* aRenderingContext) override;
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
nsresult GetFrameName(nsAString& aResult) const override;
|
|
#endif
|
|
|
|
nscoord GetLogicalBaseline(mozilla::WritingMode aWM) const override;
|
|
|
|
bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
|
|
nscoord* aBaseline) const override {
|
|
return GetNaturalBaselineBOffset(aWM, BaselineSharingGroup::First,
|
|
aBaseline);
|
|
}
|
|
|
|
bool GetNaturalBaselineBOffset(mozilla::WritingMode aWM,
|
|
BaselineSharingGroup aBaselineGroup,
|
|
nscoord* aBaseline) const override {
|
|
if (HasAnyStateBits(NS_STATE_FLEX_SYNTHESIZE_BASELINE)) {
|
|
return false;
|
|
}
|
|
*aBaseline = aBaselineGroup == BaselineSharingGroup::First
|
|
? mBaselineFromLastReflow
|
|
: mLastBaselineFromLastReflow;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns the effective value of -webkit-line-clamp for this flex container.
|
|
*
|
|
* This will be 0 if the property is 'none', or if the element is not
|
|
* display:-webkit-(inline-)box and -webkit-box-orient:vertical.
|
|
*/
|
|
uint32_t GetLineClampValue() const;
|
|
|
|
// nsContainerFrame overrides
|
|
uint16_t CSSAlignmentForAbsPosChild(
|
|
const ReflowInput& aChildRI,
|
|
mozilla::LogicalAxis aLogicalAxis) const override;
|
|
|
|
/**
|
|
* Helper function to calculate packing space and initial offset of alignment
|
|
* subjects in MainAxisPositionTracker() and CrossAxisPositionTracker() for
|
|
* space-between, space-around, and space-evenly.
|
|
* * @param aNumThingsToPack Number of alignment subjects.
|
|
* @param aAlignVal Value for align-self or justify-self.
|
|
* @param aFirstSubjectOffset Outparam for first subject offset.
|
|
* @param aNumPackingSpacesRemaining Outparam for number of equal-sized
|
|
* packing spaces to apply between each
|
|
* alignment subject.
|
|
* @param aPackingSpaceRemaining Outparam for total amount of packing
|
|
* space to be divided up.
|
|
*/
|
|
static void CalculatePackingSpace(uint32_t aNumThingsToPack,
|
|
uint8_t aAlignVal,
|
|
nscoord* aFirstSubjectOffset,
|
|
uint32_t* aNumPackingSpacesRemaining,
|
|
nscoord* aPackingSpaceRemaining);
|
|
|
|
/**
|
|
* This property is created by a call to
|
|
* nsFlexContainerFrame::GetFlexFrameWithComputedInfo.
|
|
*/
|
|
NS_DECLARE_FRAME_PROPERTY_DELETABLE(FlexContainerInfo,
|
|
ComputedFlexContainerInfo)
|
|
/**
|
|
* This function should only be called on a nsFlexContainerFrame
|
|
* that has just been returned by a call to
|
|
* GetFlexFrameWithComputedInfo.
|
|
*/
|
|
const ComputedFlexContainerInfo* GetFlexContainerInfo() {
|
|
const ComputedFlexContainerInfo* info = GetProperty(FlexContainerInfo());
|
|
NS_WARNING_ASSERTION(info,
|
|
"Property generation wasn't requested. "
|
|
"This is a known issue in Print Preview. "
|
|
"See Bug 1157012.");
|
|
return info;
|
|
}
|
|
|
|
/**
|
|
* Return aFrame as a flex frame after ensuring it has computed flex info.
|
|
* @return nullptr if aFrame is null or doesn't have a flex frame
|
|
* as its content insertion frame.
|
|
* @note this might destroy layout/style data since it may flush layout.
|
|
*/
|
|
MOZ_CAN_RUN_SCRIPT_BOUNDARY
|
|
static nsFlexContainerFrame* GetFlexFrameWithComputedInfo(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Given a frame for a flex item, this method returns true IFF that flex
|
|
* item's inline axis is the same as (i.e. not orthogonal to) its flex
|
|
* container's main axis.
|
|
*
|
|
* (This method is only intended to be used from external
|
|
* callers. Inside of flex reflow code, FlexItem::IsInlineAxisMainAxis() is
|
|
* equivalent & more optimal.)
|
|
*
|
|
* @param aFrame a flex item (must return true from IsFlexItem)
|
|
* @return true iff aFrame's inline axis is the same as (i.e. not orthogonal
|
|
* to) its flex container's main axis. Otherwise, false.
|
|
*/
|
|
static bool IsItemInlineAxisMainAxis(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Returns true iff the given computed 'flex-basis' & main-size property
|
|
* values collectively represent a used flex-basis of 'content'.
|
|
* See https://drafts.csswg.org/css-flexbox-1/#valdef-flex-basis-auto
|
|
*
|
|
* @param aFlexBasis the computed 'flex-basis' for a flex item.
|
|
* @param aMainSize the computed main-size property for a flex item.
|
|
*/
|
|
static bool IsUsedFlexBasisContent(const StyleFlexBasis& aFlexBasis,
|
|
const StyleSize& aMainSize);
|
|
|
|
/**
|
|
* Callback for nsFrame::MarkIntrinsicISizesDirty() on a flex item.
|
|
*/
|
|
static void MarkCachedFlexMeasurementsDirty(nsIFrame* aItemFrame);
|
|
|
|
protected:
|
|
// Protected constructor & destructor
|
|
explicit nsFlexContainerFrame(ComputedStyle* aStyle,
|
|
nsPresContext* aPresContext)
|
|
: nsContainerFrame(aStyle, aPresContext, kClassID) {}
|
|
|
|
virtual ~nsFlexContainerFrame();
|
|
|
|
/*
|
|
* This method does the bulk of the flex layout, implementing the algorithm
|
|
* described at:
|
|
* http://dev.w3.org/csswg/css-flexbox/#layout-algorithm
|
|
* (with a few initialization pieces happening in the caller, Reflow().
|
|
*
|
|
* Since this is a helper for Reflow(), this takes all the same parameters
|
|
* as Reflow(), plus a few more parameters that Reflow() sets up for us.
|
|
*
|
|
* (The logic behind the division of work between Reflow and DoFlexLayout is
|
|
* as follows: DoFlexLayout() begins at the step that we have to jump back
|
|
* to, if we find any visibility:collapse children, and Reflow() does
|
|
* everything before that point.)
|
|
*/
|
|
void DoFlexLayout(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
|
|
const ReflowInput& aReflowInput, nsReflowStatus& aStatus,
|
|
nscoord aContentBoxMainSize,
|
|
nscoord aAvailableBSizeForContent,
|
|
nsTArray<StrutInfo>& aStruts,
|
|
const FlexboxAxisTracker& aAxisTracker,
|
|
nscoord aMainGapSize, nscoord aCrossGapSize,
|
|
bool aHasLineClampEllipsis);
|
|
|
|
/**
|
|
* Checks whether our child-frame list "mFrames" is sorted, using the given
|
|
* IsLessThanOrEqual function, and sorts it if it's not already sorted.
|
|
*
|
|
* XXXdholbert Once we support pagination, we need to make this function
|
|
* check our continuations as well (or wrap it in a function that does).
|
|
*
|
|
* @return true if we had to sort mFrames, false if it was already sorted.
|
|
*/
|
|
template <bool IsLessThanOrEqual(nsIFrame*, nsIFrame*)>
|
|
bool SortChildrenIfNeeded();
|
|
|
|
// Protected flex-container-specific methods / member-vars
|
|
#ifdef DEBUG
|
|
void SanityCheckAnonymousFlexItems() const;
|
|
#endif // DEBUG
|
|
|
|
/*
|
|
* Returns a new FlexItem for the given child frame, allocated on the heap.
|
|
* Guaranteed to return non-null. Caller is responsible for managing the
|
|
* FlexItem's lifetime.
|
|
*
|
|
* Before returning, this method also processes the FlexItem to resolve its
|
|
* flex basis (including e.g. auto-height) as well as to resolve
|
|
* "min-height:auto", via ResolveAutoFlexBasisAndMinSize(). (Basically, the
|
|
* returned FlexItem will be ready to participate in the "Resolve the
|
|
* Flexible Lengths" step of the Flex Layout Algorithm.)
|
|
*/
|
|
mozilla::UniquePtr<FlexItem> GenerateFlexItemForChild(
|
|
nsPresContext* aPresContext, nsIFrame* aChildFrame,
|
|
const ReflowInput& aParentReflowInput,
|
|
const FlexboxAxisTracker& aAxisTracker, bool aHasLineClampEllipsis);
|
|
|
|
/**
|
|
* This method gets a cached measuring reflow for a flex item, or does it and
|
|
* caches it.
|
|
*
|
|
* This avoids exponential reflows, see the comment on
|
|
* CachedMeasuringReflowResult.
|
|
*/
|
|
const CachedMeasuringReflowResult& MeasureAscentAndBSizeForFlexItem(
|
|
FlexItem& aItem, nsPresContext* aPresContext,
|
|
ReflowInput& aChildReflowInput);
|
|
|
|
/**
|
|
* This method performs a "measuring" reflow to get the content BSize of
|
|
* aFlexItem.Frame() (treating it as if it had a computed BSize of "auto"),
|
|
* and returns the resulting BSize measurement.
|
|
* (Helper for ResolveAutoFlexBasisAndMinSize().)
|
|
*/
|
|
nscoord MeasureFlexItemContentBSize(nsPresContext* aPresContext,
|
|
FlexItem& aFlexItem,
|
|
bool aForceBResizeForMeasuringReflow,
|
|
bool aHasLineClampEllipsis,
|
|
const ReflowInput& aParentReflowInput);
|
|
|
|
/**
|
|
* This method resolves an "auto" flex-basis and/or min-main-size value
|
|
* on aFlexItem, if needed.
|
|
* (Helper for GenerateFlexItemForChild().)
|
|
*/
|
|
void ResolveAutoFlexBasisAndMinSize(nsPresContext* aPresContext,
|
|
FlexItem& aFlexItem,
|
|
const ReflowInput& aItemReflowInput,
|
|
const FlexboxAxisTracker& aAxisTracker,
|
|
bool aHasLineClampEllipsis);
|
|
|
|
/**
|
|
* Returns true if "this" is the nsFlexContainerFrame for a -moz-box or
|
|
* a -moz-inline-box -- these boxes have special behavior for flex items with
|
|
* "visibility:collapse".
|
|
*
|
|
* @param aFlexStyleDisp This frame's StyleDisplay(). (Just an optimization to
|
|
* avoid repeated lookup; some callers already have it.)
|
|
* @return true if "this" is the nsFlexContainerFrame for a -moz-{inline}box.
|
|
*/
|
|
bool ShouldUseMozBoxCollapseBehavior(const nsStyleDisplay* aFlexStyleDisp);
|
|
|
|
/**
|
|
* This method:
|
|
* - Creates FlexItems for all of our child frames (except placeholders).
|
|
* - Groups those FlexItems into FlexLines.
|
|
* - Returns those FlexLines in the outparam |aLines|.
|
|
*
|
|
* For any child frames which are placeholders, this method will instead just
|
|
* append that child to the outparam |aPlaceholders| for separate handling.
|
|
* (Absolutely positioned children of a flex container are *not* flex items.)
|
|
*/
|
|
void GenerateFlexLines(nsPresContext* aPresContext,
|
|
const ReflowInput& aReflowInput,
|
|
nscoord aContentBoxMainSize,
|
|
nscoord aAvailableBSizeForContent,
|
|
const nsTArray<StrutInfo>& aStruts,
|
|
const FlexboxAxisTracker& aAxisTracker,
|
|
nscoord aMainGapSize, bool aHasLineClampEllipsis,
|
|
nsTArray<nsIFrame*>& aPlaceholders,
|
|
mozilla::LinkedList<FlexLine>& aLines);
|
|
|
|
nscoord GetMainSizeFromReflowInput(const ReflowInput& aReflowInput,
|
|
const FlexboxAxisTracker& aAxisTracker);
|
|
|
|
nscoord ComputeCrossSize(const ReflowInput& aReflowInput,
|
|
const FlexboxAxisTracker& aAxisTracker,
|
|
nscoord aSumLineCrossSizes,
|
|
nscoord aAvailableBSizeForContent, bool* aIsDefinite,
|
|
nsReflowStatus& aStatus);
|
|
|
|
void SizeItemInCrossAxis(nsPresContext* aPresContext,
|
|
const FlexboxAxisTracker& aAxisTracker,
|
|
ReflowInput& aChildReflowInput, FlexItem& aItem);
|
|
|
|
/**
|
|
* Moves the given flex item's frame to the given LogicalPosition (modulo any
|
|
* relative positioning).
|
|
*
|
|
* This can be used in cases where we've already done a "measuring reflow"
|
|
* for the flex item at the correct size, and hence can skip its final reflow
|
|
* (but still need to move it to the right final position).
|
|
*
|
|
* @param aReflowInput The flex container's reflow input.
|
|
* @param aItem The flex item whose frame should be moved.
|
|
* @param aFramePos The position where the flex item's frame should
|
|
* be placed. (pre-relative positioning)
|
|
* @param aContainerSize The flex container's size (required by some methods
|
|
* that we call, to interpret aFramePos correctly).
|
|
*/
|
|
void MoveFlexItemToFinalPosition(const ReflowInput& aReflowInput,
|
|
const FlexItem& aItem,
|
|
mozilla::LogicalPoint& aFramePos,
|
|
const nsSize& aContainerSize);
|
|
/**
|
|
* Helper-function to reflow a child frame, at its final position determined
|
|
* by flex layout.
|
|
*
|
|
* @param aPresContext The presentation context being used in reflow.
|
|
* @param aAxisTracker A FlexboxAxisTracker with the flex container's axes.
|
|
* @param aReflowInput The flex container's reflow input.
|
|
* @param aItem The flex item to be reflowed.
|
|
* @param aFramePos The position where the flex item's frame should
|
|
* be placed. (pre-relative positioning)
|
|
* @param aContainerSize The flex container's size (required by some methods
|
|
* that we call, to interpret aFramePos correctly).
|
|
*/
|
|
void ReflowFlexItem(nsPresContext* aPresContext,
|
|
const FlexboxAxisTracker& aAxisTracker,
|
|
const ReflowInput& aReflowInput, const FlexItem& aItem,
|
|
mozilla::LogicalPoint& aFramePos,
|
|
const nsSize& aContainerSize, bool aHasLineClampEllipsis);
|
|
|
|
/**
|
|
* Helper-function to perform a "dummy reflow" on all our nsPlaceholderFrame
|
|
* children, at the container's content-box origin.
|
|
*
|
|
* This doesn't actually represent the static position of the placeholders'
|
|
* out-of-flow (OOF) frames -- we can't compute that until we've reflowed the
|
|
* OOF, because (depending on the CSS Align properties) the static position
|
|
* may be influenced by the OOF's size. So for now, we just co-opt the
|
|
* placeholder to store the flex container's logical content-box origin, and
|
|
* we defer to nsAbsoluteContainingBlock to determine the OOF's actual static
|
|
* position (using this origin, the OOF's size, and the CSS Align
|
|
* properties).
|
|
*
|
|
* @param aPresContext The presentation context being used in reflow.
|
|
* @param aReflowInput The flex container's reflow input.
|
|
* @param aPlaceholders An array of all the flex container's
|
|
* nsPlaceholderFrame children.
|
|
* @param aContentBoxOrigin The flex container's logical content-box
|
|
* origin (in its own coordinate space).
|
|
* @param aContainerSize The flex container's size (required by some
|
|
* reflow methods to interpret positions correctly).
|
|
*/
|
|
void ReflowPlaceholders(nsPresContext* aPresContext,
|
|
const ReflowInput& aReflowInput,
|
|
nsTArray<nsIFrame*>& aPlaceholders,
|
|
const mozilla::LogicalPoint& aContentBoxOrigin,
|
|
const nsSize& aContainerSize);
|
|
|
|
/**
|
|
* Helper for GetMinISize / GetPrefISize.
|
|
*/
|
|
nscoord IntrinsicISize(gfxContext* aRenderingContext,
|
|
nsLayoutUtils::IntrinsicISizeType aType);
|
|
|
|
/**
|
|
* Cached values to optimize GetMinISize/GetPrefISize.
|
|
*/
|
|
nscoord mCachedMinISize = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
nscoord mCachedPrefISize = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
|
|
nscoord mBaselineFromLastReflow = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
// Note: the last baseline is a distance from our border-box end edge.
|
|
nscoord mLastBaselineFromLastReflow = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
};
|
|
|
|
#endif /* nsFlexContainerFrame_h___ */
|