gecko-dev/layout/generic/nsGridContainerFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code is subject to the terms of the Mozilla Public License
* version 2.0 (the "License"). You can obtain a copy of the License at
* http://mozilla.org/MPL/2.0/. */
/* rendering object for CSS "display: grid | inline-grid" */
#ifndef nsGridContainerFrame_h___
#define nsGridContainerFrame_h___
#include "mozilla/Maybe.h"
#include "mozilla/TypeTraits.h"
#include "nsContainerFrame.h"
#include "nsHashKeys.h"
#include "nsTHashtable.h"
/**
* Factory function.
* @return a newly allocated nsGridContainerFrame (infallible)
*/
nsContainerFrame* NS_NewGridContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext);
namespace mozilla {
// Forward-declare typedefs for grid item iterator helper-class:
template<typename Iterator> class CSSOrderAwareFrameIteratorT;
typedef CSSOrderAwareFrameIteratorT<nsFrameList::iterator>
CSSOrderAwareFrameIterator;
typedef CSSOrderAwareFrameIteratorT<nsFrameList::reverse_iterator>
ReverseCSSOrderAwareFrameIterator;
/**
* The number of implicit / explicit tracks and their sizes.
*/
struct ComputedGridTrackInfo
{
ComputedGridTrackInfo(uint32_t aNumLeadingImplicitTracks,
uint32_t aNumExplicitTracks,
uint32_t aStartFragmentTrack,
uint32_t aEndFragmentTrack,
nsTArray<nscoord>&& aPositions,
nsTArray<nscoord>&& aSizes,
nsTArray<uint32_t>&& aStates,
nsTArray<bool>&& aRemovedRepeatTracks,
uint32_t aRepeatFirstTrack)
: mNumLeadingImplicitTracks(aNumLeadingImplicitTracks)
, mNumExplicitTracks(aNumExplicitTracks)
, mStartFragmentTrack(aStartFragmentTrack)
, mEndFragmentTrack(aEndFragmentTrack)
, mPositions(aPositions)
, mSizes(aSizes)
, mStates(aStates)
, mRemovedRepeatTracks(aRemovedRepeatTracks)
, mRepeatFirstTrack(aRepeatFirstTrack)
{}
uint32_t mNumLeadingImplicitTracks;
uint32_t mNumExplicitTracks;
uint32_t mStartFragmentTrack;
uint32_t mEndFragmentTrack;
nsTArray<nscoord> mPositions;
nsTArray<nscoord> mSizes;
nsTArray<uint32_t> mStates;
nsTArray<bool> mRemovedRepeatTracks;
uint32_t mRepeatFirstTrack;
};
struct ComputedGridLineInfo
{
explicit ComputedGridLineInfo(nsTArray<nsTArray<nsString>>&& aNames,
const nsTArray<nsString>& aNamesBefore,
const nsTArray<nsString>& aNamesAfter)
: mNames(aNames)
, mNamesBefore(aNamesBefore)
, mNamesAfter(aNamesAfter)
{}
nsTArray<nsTArray<nsString>> mNames;
nsTArray<nsString> mNamesBefore;
nsTArray<nsString> mNamesAfter;
};
} // namespace mozilla
class nsGridContainerFrame final : public nsContainerFrame
{
public:
NS_DECL_FRAMEARENA_HELPERS(nsGridContainerFrame)
NS_DECL_QUERYFRAME
typedef mozilla::ComputedGridTrackInfo ComputedGridTrackInfo;
typedef mozilla::ComputedGridLineInfo ComputedGridLineInfo;
// nsIFrame overrides
void Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
nscoord GetMinISize(gfxContext* aRenderingContext) override;
nscoord GetPrefISize(gfxContext* aRenderingContext) override;
void MarkIntrinsicISizesDirty() override;
bool IsFrameOfType(uint32_t aFlags) const override
{
return nsContainerFrame::IsFrameOfType(aFlags &
~nsIFrame::eCanContainOverflowContainers);
}
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) override;
nscoord GetLogicalBaseline(mozilla::WritingMode aWM) const override
{
if (HasAnyStateBits(NS_STATE_GRID_SYNTHESIZE_BASELINE)) {
// Return a baseline synthesized from our margin-box.
return nsContainerFrame::GetLogicalBaseline(aWM);
}
nscoord b;
GetBBaseline(BaselineSharingGroup::eFirst, &b);
return b;
}
bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
nscoord* aBaseline) const override
{
return GetNaturalBaselineBOffset(aWM, BaselineSharingGroup::eFirst, aBaseline);
}
bool GetNaturalBaselineBOffset(mozilla::WritingMode aWM,
BaselineSharingGroup aBaselineGroup,
nscoord* aBaseline) const override
{
if (HasAnyStateBits(NS_STATE_GRID_SYNTHESIZE_BASELINE)) {
return false;
}
return GetBBaseline(aBaselineGroup, aBaseline);
}
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const override;
#endif
// nsContainerFrame overrides
bool DrainSelfOverflowList() override;
void AppendFrames(ChildListID aListID, nsFrameList& aFrameList) override;
void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
nsFrameList& aFrameList) override;
void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;
uint16_t CSSAlignmentForAbsPosChild(
const ReflowInput& aChildRI,
mozilla::LogicalAxis aLogicalAxis) const override;
#ifdef DEBUG
void SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) override;
#endif
/**
* Return the containing block for aChild which MUST be an abs.pos. child
* of a grid container. This is just a helper method for
* nsAbsoluteContainingBlock::Reflow - it's not meant to be used elsewhere.
*/
static const nsRect& GridItemCB(nsIFrame* aChild);
NS_DECLARE_FRAME_PROPERTY_DELETABLE(GridItemContainingBlockRect, nsRect)
/**
* These properties are created by a call to
* nsGridContainerFrame::GetGridFrameWithComputedInfo, typically from
* Element::GetGridFragments.
*/
NS_DECLARE_FRAME_PROPERTY_DELETABLE(GridColTrackInfo, ComputedGridTrackInfo)
const ComputedGridTrackInfo* GetComputedTemplateColumns()
{
const ComputedGridTrackInfo* info = GetProperty(GridColTrackInfo());
MOZ_ASSERT(info, "Property generation wasn't requested.");
return info;
}
NS_DECLARE_FRAME_PROPERTY_DELETABLE(GridRowTrackInfo, ComputedGridTrackInfo)
const ComputedGridTrackInfo* GetComputedTemplateRows()
{
const ComputedGridTrackInfo* info = GetProperty(GridRowTrackInfo());
MOZ_ASSERT(info, "Property generation wasn't requested.");
return info;
}
NS_DECLARE_FRAME_PROPERTY_DELETABLE(GridColumnLineInfo, ComputedGridLineInfo)
const ComputedGridLineInfo* GetComputedTemplateColumnLines()
{
const ComputedGridLineInfo* info = GetProperty(GridColumnLineInfo());
MOZ_ASSERT(info, "Property generation wasn't requested.");
return info;
}
NS_DECLARE_FRAME_PROPERTY_DELETABLE(GridRowLineInfo, ComputedGridLineInfo)
const ComputedGridLineInfo* GetComputedTemplateRowLines()
{
const ComputedGridLineInfo* info = GetProperty(GridRowLineInfo());
MOZ_ASSERT(info, "Property generation wasn't requested.");
return info;
}
typedef nsBaseHashtable<nsStringHashKey,
mozilla::css::GridNamedArea,
mozilla::css::GridNamedArea> ImplicitNamedAreas;
NS_DECLARE_FRAME_PROPERTY_DELETABLE(ImplicitNamedAreasProperty,
ImplicitNamedAreas)
ImplicitNamedAreas* GetImplicitNamedAreas() const {
return GetProperty(ImplicitNamedAreasProperty());
}
typedef nsTArray<mozilla::css::GridNamedArea> ExplicitNamedAreas;
NS_DECLARE_FRAME_PROPERTY_DELETABLE(ExplicitNamedAreasProperty,
ExplicitNamedAreas)
ExplicitNamedAreas* GetExplicitNamedAreas() const {
return GetProperty(ExplicitNamedAreasProperty());
}
/**
* Return a containing grid frame, and ensure it has computed grid info
* @return nullptr if aFrame has no grid container, or frame was destroyed
* @note this might destroy layout/style data since it may flush layout
*/
static nsGridContainerFrame* GetGridFrameWithComputedInfo(nsIFrame* aFrame);
struct TrackSize;
struct GridItemInfo;
struct GridReflowInput;
struct FindItemInGridOrderResult
{
// The first(last) item in (reverse) grid order.
const GridItemInfo* mItem;
// Does the above item span the first(last) track?
bool mIsInEdgeTrack;
};
protected:
static const uint32_t kAutoLine;
// The maximum line number, in the zero-based translated grid.
static const uint32_t kTranslatedMaxLine;
typedef mozilla::LogicalPoint LogicalPoint;
typedef mozilla::LogicalRect LogicalRect;
typedef mozilla::LogicalSize LogicalSize;
typedef mozilla::CSSOrderAwareFrameIterator CSSOrderAwareFrameIterator;
typedef mozilla::ReverseCSSOrderAwareFrameIterator
ReverseCSSOrderAwareFrameIterator;
typedef mozilla::WritingMode WritingMode;
typedef mozilla::css::GridNamedArea GridNamedArea;
typedef mozilla::layout::AutoFrameListPtr AutoFrameListPtr;
typedef nsLayoutUtils::IntrinsicISizeType IntrinsicISizeType;
struct Grid;
struct GridArea;
class LineNameMap;
struct LineRange;
struct SharedGridData;
struct TrackSizingFunctions;
struct Tracks;
struct TranslatedLineRange;
friend nsContainerFrame* NS_NewGridContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext);
explicit nsGridContainerFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext, kClassID)
, mCachedMinISize(NS_INTRINSIC_WIDTH_UNKNOWN)
, mCachedPrefISize(NS_INTRINSIC_WIDTH_UNKNOWN)
{
mBaseline[0][0] = NS_INTRINSIC_WIDTH_UNKNOWN;
mBaseline[0][1] = NS_INTRINSIC_WIDTH_UNKNOWN;
mBaseline[1][0] = NS_INTRINSIC_WIDTH_UNKNOWN;
mBaseline[1][1] = NS_INTRINSIC_WIDTH_UNKNOWN;
}
/**
* XXX temporary - move the ImplicitNamedAreas stuff to the style system.
* The implicit area names that come from x-start .. x-end lines in
* grid-template-columns / grid-template-rows are stored in this frame
* property when needed, as a ImplicitNamedAreas* value.
*/
void InitImplicitNamedAreas(const nsStylePosition* aStyle);
void AddImplicitNamedAreas(const nsTArray<nsTArray<nsString>>& aLineNameLists);
/**
* Reflow and place our children.
* @return the consumed size of all of this grid container's continuations
* so far including this frame
*/
nscoord ReflowChildren(GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus);
/**
* Helper for GetMinISize / GetPrefISize.
*/
nscoord IntrinsicISize(gfxContext* aRenderingContext,
IntrinsicISizeType aConstraint);
// Helper for AppendFrames / InsertFrames.
void NoteNewChildren(ChildListID aListID, const nsFrameList& aFrameList);
// Helper to move child frames into the kOverflowList.
void MergeSortedOverflow(nsFrameList& aList);
// Helper to move child frames into the kExcessOverflowContainersList:.
void MergeSortedExcessOverflowContainers(nsFrameList& aList);
bool GetBBaseline(BaselineSharingGroup aBaselineGroup, nscoord* aResult) const
{
*aResult = mBaseline[mozilla::eLogicalAxisBlock][aBaselineGroup];
return true;
}
bool GetIBaseline(BaselineSharingGroup aBaselineGroup, nscoord* aResult) const
{
*aResult = mBaseline[mozilla::eLogicalAxisInline][aBaselineGroup];
return true;
}
/**
* Calculate this grid container's baselines.
* @param aBaselineSet which baseline(s) to derive from a baseline-group or
* items; a baseline not included is synthesized from the border-box instead.
* @param aFragmentStartTrack is the first track in this fragment in the same
* axis as aMajor. Pass zero if that's not the axis we're fragmenting in.
* @param aFirstExcludedTrack should be the first track in the next fragment
* or one beyond the final track in the last fragment, in aMajor's axis.
* Pass the number of tracks if that's not the axis we're fragmenting in.
*/
enum BaselineSet : uint32_t {
eNone = 0x0,
eFirst = 0x1,
eLast = 0x2,
eBoth = eFirst | eLast,
};
void CalculateBaselines(BaselineSet aBaselineSet,
CSSOrderAwareFrameIterator* aIter,
const nsTArray<GridItemInfo>* aGridItems,
const Tracks& aTracks,
uint32_t aFragmentStartTrack,
uint32_t aFirstExcludedTrack,
WritingMode aWM,
const nsSize& aCBPhysicalSize,
nscoord aCBBorderPaddingStart,
nscoord aCBBorderPaddingStartEnd,
nscoord aCBSize);
/**
* Synthesize a Grid container baseline for aGroup.
*/
nscoord SynthesizeBaseline(const FindItemInGridOrderResult& aItem,
mozilla::LogicalAxis aAxis,
BaselineSharingGroup aGroup,
const nsSize& aCBPhysicalSize,
nscoord aCBSize,
WritingMode aCBWM);
/**
* Find the first item in Grid Order in this fragment.
* https://drafts.csswg.org/css-grid/#grid-order
* @param aFragmentStartTrack is the first track in this fragment in the same
* axis as aMajor. Pass zero if that's not the axis we're fragmenting in.
*/
static FindItemInGridOrderResult
FindFirstItemInGridOrder(CSSOrderAwareFrameIterator& aIter,
const nsTArray<GridItemInfo>& aGridItems,
LineRange GridArea::* aMajor,
LineRange GridArea::* aMinor,
uint32_t aFragmentStartTrack);
/**
* Find the last item in Grid Order in this fragment.
* @param aFragmentStartTrack is the first track in this fragment in the same
* axis as aMajor. Pass zero if that's not the axis we're fragmenting in.
* @param aFirstExcludedTrack should be the first track in the next fragment
* or one beyond the final track in the last fragment, in aMajor's axis.
* Pass the number of tracks if that's not the axis we're fragmenting in.
*/
static FindItemInGridOrderResult
FindLastItemInGridOrder(ReverseCSSOrderAwareFrameIterator& aIter,
const nsTArray<GridItemInfo>& aGridItems,
LineRange GridArea::* aMajor,
LineRange GridArea::* aMinor,
uint32_t aFragmentStartTrack,
uint32_t aFirstExcludedTrack);
#ifdef DEBUG
void SanityCheckGridItemsBeforeReflow() const;
#endif // DEBUG
private:
// Helpers for ReflowChildren
struct Fragmentainer {
/**
* The distance from the first grid container fragment's block-axis content
* edge to the fragmentainer end.
*/
nscoord mToFragmentainerEnd;
/**
* True if the current fragment is at the start of the fragmentainer.
*/
bool mIsTopOfPage;
/**
* Is there a Class C break opportunity at the start content edge?
*/
bool mCanBreakAtStart;
/**
* Is there a Class C break opportunity at the end content edge?
*/
bool mCanBreakAtEnd;
/**
* Is the grid container's block-size unconstrained?
*/
bool mIsAutoBSize;
};
mozilla::Maybe<nsGridContainerFrame::Fragmentainer>
GetNearestFragmentainer(const GridReflowInput& aState) const;
// @return the consumed size of all continuations so far including this frame
nscoord ReflowInFragmentainer(GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus,
Fragmentainer& aFragmentainer,
const nsSize& aContainerSize);
// Helper for ReflowInFragmentainer
// @return the consumed size of all continuations so far including this frame
nscoord ReflowRowsInFragmentainer(GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus,
Fragmentainer& aFragmentainer,
const nsSize& aContainerSize,
const nsTArray<const GridItemInfo*>& aItems,
uint32_t aStartRow,
uint32_t aEndRow,
nscoord aBSize,
nscoord aAvailableSize);
// Helper for ReflowChildren / ReflowInFragmentainer
void ReflowInFlowChild(nsIFrame* aChild,
const GridItemInfo* aGridItemInfo,
nsSize aContainerSize,
const mozilla::Maybe<nscoord>& aStretchBSize,
const Fragmentainer* aFragmentainer,
const GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus);
/**
* Cached values to optimize GetMinISize/GetPrefISize.
*/
nscoord mCachedMinISize;
nscoord mCachedPrefISize;
// Our baselines, one per BaselineSharingGroup per axis.
nscoord mBaseline[2/*LogicalAxis*/][2/*BaselineSharingGroup*/];
#ifdef DEBUG
// If true, NS_STATE_GRID_DID_PUSH_ITEMS may be set even though all pushed
// frames may have been removed. This is used to suppress an assertion
// in case RemoveFrame removed all associated child frames.
bool mDidPushItemsBitMayLie { false };
#endif
};
#endif /* nsGridContainerFrame_h___ */