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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/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);
class nsGridContainerFrame final : public nsContainerFrame
{
public:
NS_DECL_FRAMEARENA_HELPERS
NS_DECL_QUERYFRAME_TARGET(nsGridContainerFrame)
NS_DECL_QUERYFRAME
// nsIFrame overrides
void Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus) override;
nscoord GetMinISize(nsRenderingContext* aRenderingContext) override;
nscoord GetPrefISize(nsRenderingContext* aRenderingContext) override;
void MarkIntrinsicISizesDirty() override;
virtual nsIAtom* GetType() const override;
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) override;
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const 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);
struct TrackSize {
void Initialize(nscoord aPercentageBasis,
const nsStyleCoord& aMinCoord,
const nsStyleCoord& aMaxCoord);
bool IsFrozen() const { return mState & eFrozen; }
#ifdef DEBUG
void Dump() const;
#endif
enum StateBits : uint16_t {
eAutoMinSizing = 0x1,
eMinContentMinSizing = 0x2,
eMaxContentMinSizing = 0x4,
eMinOrMaxContentMinSizing = eMinContentMinSizing | eMaxContentMinSizing,
eIntrinsicMinSizing = eMinOrMaxContentMinSizing | eAutoMinSizing,
eFlexMinSizing = 0x8,
eAutoMaxSizing = 0x10,
eMinContentMaxSizing = 0x20,
eMaxContentMaxSizing = 0x40,
eAutoOrMaxContentMaxSizing = eAutoMaxSizing | eMaxContentMaxSizing,
eIntrinsicMaxSizing = eAutoOrMaxContentMaxSizing | eMinContentMaxSizing,
eFlexMaxSizing = 0x80,
eFrozen = 0x100,
eSkipGrowUnlimited1 = 0x200,
eSkipGrowUnlimited2 = 0x400,
eSkipGrowUnlimited = eSkipGrowUnlimited1 | eSkipGrowUnlimited2,
};
nscoord mBase;
nscoord mLimit;
StateBits mState;
};
// @see nsAbsoluteContainingBlock::Reflow about this magic number
static const nscoord VERY_LIKELY_A_GRID_CONTAINER = -123456789;
NS_DECLARE_FRAME_PROPERTY(GridItemContainingBlockRect, DeleteValue<nsRect>)
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::WritingMode WritingMode;
typedef mozilla::css::GridNamedArea GridNamedArea;
typedef nsLayoutUtils::IntrinsicISizeType IntrinsicISizeType;
class GridItemCSSOrderIterator;
struct TrackSizingFunctions;
struct Tracks;
struct GridReflowState;
friend nsContainerFrame* NS_NewGridContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext);
explicit nsGridContainerFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
, mCachedMinISize(NS_INTRINSIC_WIDTH_UNKNOWN)
, mCachedPrefISize(NS_INTRINSIC_WIDTH_UNKNOWN)
{}
/**
* A LineRange can be definite or auto - when it's definite it represents
* a consecutive set of tracks between a starting line and an ending line.
* Before it's definite it can also represent an auto position with a span,
* where mStart == kAutoLine and mEnd is the (non-zero positive) span.
* For normal-flow items, the invariant mStart < mEnd holds when both
* lines are definite.
*
* For abs.pos. grid items, mStart and mEnd may both be kAutoLine, meaning
* "attach this side to the grid container containing block edge".
* Additionally, mStart <= mEnd holds when both are definite (non-kAutoLine),
* i.e. the invariant is slightly relaxed compared to normal flow items.
*/
struct LineRange {
LineRange(int32_t aStart, int32_t aEnd)
: mUntranslatedStart(aStart), mUntranslatedEnd(aEnd)
{
#ifdef DEBUG
if (!IsAutoAuto()) {
if (IsAuto()) {
MOZ_ASSERT(aEnd >= nsStyleGridLine::kMinLine &&
aEnd <= nsStyleGridLine::kMaxLine, "invalid span");
} else {
MOZ_ASSERT(aStart >= nsStyleGridLine::kMinLine &&
aStart <= nsStyleGridLine::kMaxLine, "invalid start line");
MOZ_ASSERT(aEnd == int32_t(kAutoLine) ||
(aEnd >= nsStyleGridLine::kMinLine &&
aEnd <= nsStyleGridLine::kMaxLine), "invalid end line");
}
}
#endif
}
bool IsAutoAuto() const { return mStart == kAutoLine && mEnd == kAutoLine; }
bool IsAuto() const { return mStart == kAutoLine; }
bool IsDefinite() const { return mStart != kAutoLine; }
uint32_t Extent() const
{
MOZ_ASSERT(mEnd != kAutoLine, "Extent is undefined for abs.pos. 'auto'");
if (IsAuto()) {
MOZ_ASSERT(mEnd >= 1 && mEnd < uint32_t(nsStyleGridLine::kMaxLine),
"invalid span");
return mEnd;
}
return mEnd - mStart;
}
/**
* Resolve this auto range to start at aStart, making it definite.
* Precondition: this range IsAuto()
*/
void ResolveAutoPosition(uint32_t aStart)
{
MOZ_ASSERT(IsAuto(), "Why call me?");
mStart = aStart;
mEnd += aStart;
// Clamping per http://dev.w3.org/csswg/css-grid/#overlarge-grids :
if (MOZ_UNLIKELY(mStart >= kTranslatedMaxLine)) {
mEnd = kTranslatedMaxLine;
mStart = mEnd - 1;
} else if (MOZ_UNLIKELY(mEnd > kTranslatedMaxLine)) {
mEnd = kTranslatedMaxLine;
}
}
/**
* Return the contribution of this line range for step 2 in
* http://dev.w3.org/csswg/css-grid/#auto-placement-algo
*/
uint32_t HypotheticalEnd() const { return mEnd; }
/**
* Given an array of track sizes, return the starting position and length
* of the tracks in this line range.
*/
void ToPositionAndLength(const nsTArray<TrackSize>& aTrackSizes,
nscoord* aPos, nscoord* aLength) const;
/**
* Given an array of track sizes, return the length of the tracks in this
* line range.
*/
nscoord ToLength(const nsTArray<TrackSize>& aTrackSizes) const;
/**
* Given an array of track sizes and a grid origin coordinate, adjust the
* abs.pos. containing block along an axis given by aPos and aLength.
* aPos and aLength should already be initialized to the grid container
* containing block for this axis before calling this method.
*/
void ToPositionAndLengthForAbsPos(const nsTArray<TrackSize>& aTrackSizes,
nscoord aGridOrigin,
nscoord* aPos, nscoord* aLength) const;
/**
* @note We'll use the signed member while resolving definite positions
* to line numbers (1-based), which may become negative for implicit lines
* to the top/left of the explicit grid. PlaceGridItems() then translates
* the whole grid to a 0,0 origin and we'll use the unsigned member from
* there on.
*/
union {
uint32_t mStart;
int32_t mUntranslatedStart;
};
union {
uint32_t mEnd;
int32_t mUntranslatedEnd;
};
protected:
LineRange() {}
};
/**
* Helper class to construct a LineRange from translated lines.
* The ctor only accepts translated definite line numbers.
*/
struct TranslatedLineRange : public LineRange {
TranslatedLineRange(uint32_t aStart, uint32_t aEnd)
{
MOZ_ASSERT(aStart < aEnd && aEnd <= kTranslatedMaxLine);
mStart = aStart;
mEnd = aEnd;
}
};
/**
* Return aLine if it's inside the aMin..aMax range (inclusive), otherwise
* return kAutoLine. If the range is empty (aMin == aMax, i.e. there are
* no tracks in the grid) then aLine is outside.
*/
static int32_t
AutoIfOutside(int32_t aLine, int32_t aMin, int32_t aMax)
{
MOZ_ASSERT(aMin <= aMax);
if (aLine < aMin || aLine > aMax || aMin == aMax) {
return kAutoLine;
}
return aLine;
}
/**
* A GridArea is the area in the grid for a grid item.
* The area is represented by two LineRanges, both of which can be auto
* (@see LineRange) in intermediate steps while the item is being placed.
* @see PlaceGridItems
*/
struct GridArea {
GridArea(const LineRange& aCols, const LineRange& aRows)
: mCols(aCols), mRows(aRows) {}
bool IsDefinite() const { return mCols.IsDefinite() && mRows.IsDefinite(); }
LineRange mCols;
LineRange mRows;
};
/**
* A CellMap holds state for each cell in the grid.
* It's row major. It's sparse in the sense that it only has enough rows to
* cover the last row that has a grid item. Each row only has enough entries
* to cover columns that are occupied *on that row*, i.e. it's not a full
* matrix covering the entire implicit grid. An absent Cell means that it's
* unoccupied by any grid item.
*/
struct CellMap {
struct Cell {
Cell() : mIsOccupied(false) {}
bool mIsOccupied : 1;
};
void Fill(const GridArea& aGridArea);
void ClearOccupied();
#if DEBUG
void Dump() const;
#endif
nsTArray<nsTArray<Cell>> mCells;
};
struct GridItemInfo {
explicit GridItemInfo(const GridArea& aArea)
: mArea(aArea)
{
mIsFlexing[0] = false;
mIsFlexing[1] = false;
}
GridArea mArea;
bool mIsFlexing[2]; // does the item span a flex track? (LogicalAxis index)
static_assert(mozilla::eLogicalAxisBlock == 0, "unexpected index value");
static_assert(mozilla::eLogicalAxisInline == 1, "unexpected index value");
#ifdef DEBUG
nsIFrame* mFrame;
#endif
};
enum LineRangeSide {
eLineRangeSideStart, eLineRangeSideEnd
};
/**
* Return a line number for (non-auto) aLine, per:
* http://dev.w3.org/csswg/css-grid/#line-placement
* @param aLine style data for the line (must be non-auto)
* @param aNth a number of lines to find from aFromIndex, negative if the
* search should be in reverse order. In the case aLine has
* a specified line name, it's permitted to pass in zero which
* will be treated as one.
* @param aFromIndex the zero-based index to start counting from
* @param aLineNameList the explicit named lines
* @param aAreaStart a pointer to GridNamedArea::mColumnStart/mRowStart
* @param aAreaEnd a pointer to GridNamedArea::mColumnEnd/mRowEnd
* @param aExplicitGridEnd the last line in the explicit grid
* @param aEdge indicates whether we are resolving a start or end line
* @param aStyle the StylePosition() for the grid container
* @return a definite line (1-based), clamped to the kMinLine..kMaxLine range
*/
int32_t ResolveLine(const nsStyleGridLine& aLine,
int32_t aNth,
uint32_t aFromIndex,
const nsTArray<nsTArray<nsString>>& aLineNameList,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
LineRangeSide aEdge,
const nsStylePosition* aStyle);
/**
* Return a LineRange based on the given style data. Non-auto lines
* are resolved to a definite line number (1-based) per:
* http://dev.w3.org/csswg/css-grid/#line-placement
* with placement errors corrected per:
* http://dev.w3.org/csswg/css-grid/#grid-placement-errors
* @param aStyle the StylePosition() for the grid container
* @param aStart style data for the start line
* @param aEnd style data for the end line
* @param aLineNameList the explicit named lines
* @param aAreaStart a pointer to GridNamedArea::mColumnStart/mRowStart
* @param aAreaEnd a pointer to GridNamedArea::mColumnEnd/mRowEnd
* @param aExplicitGridEnd the last line in the explicit grid
* @param aStyle the StylePosition() for the grid container
*/
LineRange ResolveLineRange(const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const nsTArray<nsTArray<nsString>>& aLineNameList,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
const nsStylePosition* aStyle);
/**
* As above but for an abs.pos. child. Any 'auto' lines will be represented
* by kAutoLine in the LineRange result.
* @param aGridStart the first line in the final, but untranslated grid
* @param aGridEnd the last line in the final, but untranslated grid
*/
LineRange
ResolveAbsPosLineRange(const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const nsTArray<nsTArray<nsString>>& aLineNameList,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
int32_t aGridStart,
int32_t aGridEnd,
const nsStylePosition* aStyle);
/**
* Return a GridArea with non-auto lines placed at a definite line (1-based)
* with placement errors resolved. One or both positions may still
* be 'auto'.
* @param aChild the grid item
* @param aStyle the StylePosition() for the grid container
*/
GridArea PlaceDefinite(nsIFrame* aChild, const nsStylePosition* aStyle);
/**
* Place aArea in the first column (in row aArea->mRows.mStart) starting at
* aStartCol without overlapping other items. The resulting aArea may
* overflow the current implicit grid bounds.
* Pre-condition: aArea->mRows.IsDefinite() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoCol(uint32_t aStartCol, GridArea* aArea) const;
/**
* Find the first column in row aLockedRow starting at aStartCol where aArea
* could be placed without overlapping other items. The returned column may
* cause aArea to overflow the current implicit grid bounds if placed there.
*/
uint32_t FindAutoCol(uint32_t aStartCol, uint32_t aLockedRow,
const GridArea* aArea) const;
/**
* Place aArea in the first row (in column aArea->mCols.mStart) starting at
* aStartRow without overlapping other items. The resulting aArea may
* overflow the current implicit grid bounds.
* Pre-condition: aArea->mCols.IsDefinite() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoRow(uint32_t aStartRow, GridArea* aArea) const;
/**
* Find the first row in column aLockedCol starting at aStartRow where aArea
* could be placed without overlapping other items. The returned row may
* cause aArea to overflow the current implicit grid bounds if placed there.
*/
uint32_t FindAutoRow(uint32_t aLockedCol, uint32_t aStartRow,
const GridArea* aArea) const;
/**
* Place aArea in the first column starting at aStartCol,aStartRow without
* causing it to overlap other items or overflow mGridColEnd.
* If there's no such column in aStartRow, continue in position 1,aStartRow+1.
* Pre-condition: aArea->mCols.IsAuto() && aArea->mRows.IsAuto() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoAutoInRowOrder(uint32_t aStartCol, uint32_t aStartRow,
GridArea* aArea) const;
/**
* Place aArea in the first row starting at aStartCol,aStartRow without
* causing it to overlap other items or overflow mGridRowEnd.
* If there's no such row in aStartCol, continue in position aStartCol+1,1.
* Pre-condition: aArea->mCols.IsAuto() && aArea->mRows.IsAuto() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoAutoInColOrder(uint32_t aStartCol, uint32_t aStartRow,
GridArea* aArea) const;
/**
* Return a GridArea for abs.pos. item with non-auto lines placed at
* a definite line (1-based) with placement errors resolved. One or both
* positions may still be 'auto'.
* @param aChild the abs.pos. grid item to place
* @param aStyle the StylePosition() for the grid container
*/
GridArea PlaceAbsPos(nsIFrame* aChild, const nsStylePosition* aStyle);
/**
* Place all child frames into the grid and expand the (implicit) grid as
* needed. The allocated GridAreas are stored in the GridAreaProperty
* frame property on the child frame.
*/
void PlaceGridItems(GridReflowState& aState);
/**
* Initialize the end lines of the Explicit Grid (mExplicitGridCol[Row]End).
* This is determined by the larger of the number of rows/columns defined
* by 'grid-template-areas' and the 'grid-template-rows'/'-columns', plus one.
* Also initialize the Implicit Grid (mGridCol[Row]End) to the same values.
* @param aStyle the StylePosition() for the grid container
*/
void InitializeGridBounds(const nsStylePosition* aStyle);
/**
* Inflate the implicit grid to include aArea.
* @param aArea may be definite or auto
*/
void InflateGridFor(const GridArea& aArea)
{
mGridColEnd = std::max(mGridColEnd, aArea.mCols.HypotheticalEnd());
mGridRowEnd = std::max(mGridRowEnd, aArea.mRows.HypotheticalEnd());
MOZ_ASSERT(mGridColEnd <= kTranslatedMaxLine &&
mGridRowEnd <= kTranslatedMaxLine);
}
/**
* Calculate track sizes.
*/
void CalculateTrackSizes(GridReflowState& aState,
const mozilla::LogicalSize& aContentBox,
IntrinsicISizeType aConstraint);
/**
* Helper method for ResolveLineRange.
* @see ResolveLineRange
* @return a pair (start,end) of lines
*/
typedef std::pair<int32_t, int32_t> LinePair;
LinePair ResolveLineRangeHelper(const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const nsTArray<nsTArray<nsString>>& aLineNameList,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
const nsStylePosition* aStyle);
/**
* 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.
*/
NS_DECLARE_FRAME_PROPERTY(ImplicitNamedAreasProperty,
DeleteValue<ImplicitNamedAreas>)
void InitImplicitNamedAreas(const nsStylePosition* aStyle);
void AddImplicitNamedAreas(const nsTArray<nsTArray<nsString>>& aLineNameLists);
typedef nsTHashtable<nsStringHashKey> ImplicitNamedAreas;
ImplicitNamedAreas* GetImplicitNamedAreas() const {
return static_cast<ImplicitNamedAreas*>(Properties().Get(ImplicitNamedAreasProperty()));
}
bool HasImplicitNamedArea(const nsString& aName) const {
ImplicitNamedAreas* areas = GetImplicitNamedAreas();
return areas && areas->Contains(aName);
}
/**
* Return the containing block for a grid item occupying aArea.
*/
LogicalRect ContainingBlockFor(const GridReflowState& aState,
const GridArea& aArea) const;
/**
* Return the containing block for an abs.pos. grid item occupying aArea.
* Any 'auto' lines in the grid area will be aligned with grid container
* containing block on that side.
* @param aGridOrigin the origin of the grid
* @param aGridCB the grid container containing block (its padding area)
*/
LogicalRect ContainingBlockForAbsPos(const GridReflowState& aState,
const GridArea& aArea,
const LogicalPoint& aGridOrigin,
const LogicalRect& aGridCB) const;
/**
* Reflow and place our children.
*/
void ReflowChildren(GridReflowState& aState,
const LogicalRect& aContentArea,
nsHTMLReflowMetrics& aDesiredSize,
nsReflowStatus& aStatus);
/**
* Helper for GetMinISize / GetPrefISize.
*/
nscoord IntrinsicISize(nsRenderingContext* aRenderingContext,
IntrinsicISizeType aConstraint);
#ifdef DEBUG
void SanityCheckAnonymousGridItems() const;
#endif // DEBUG
private:
/**
* Info about each (normal flow) grid item.
*/
nsTArray<GridItemInfo> mGridItems;
/**
* Info about each grid-aligned abs.pos. child.
*/
nsTArray<GridItemInfo> mAbsPosItems;
/**
* State for each cell in the grid.
*/
CellMap mCellMap;
/**
* The last column grid line (1-based) in the explicit grid.
* (i.e. the number of explicit columns + 1)
*/
uint32_t mExplicitGridColEnd;
/**
* The last row grid line (1-based) in the explicit grid.
* (i.e. the number of explicit rows + 1)
*/
uint32_t mExplicitGridRowEnd;
// Same for the implicit grid, except these become zero-based after
// resolving definite lines.
uint32_t mGridColEnd;
uint32_t mGridRowEnd;
/**
* Offsets from the start of the implicit grid to the start of the translated
* explicit grid. They are zero if there are no implicit lines before 1,1.
* e.g. "grid-column: span 3 / 1" makes mExplicitGridOffsetCol = 3 and the
* corresponding GridArea::mCols will be 0 / 3 in the zero-based translated
* grid.
*/
uint32_t mExplicitGridOffsetCol;
uint32_t mExplicitGridOffsetRow;
/**
* Cached values to optimize GetMinISize/GetPrefISize.
*/
nscoord mCachedMinISize;
nscoord mCachedPrefISize;
/**
* True iff the normal flow children are already in CSS 'order' in the
* order they occur in the child frame list.
*/
bool mIsNormalFlowInCSSOrder : 1;
};
namespace mozilla {
template <>
struct IsPod<nsGridContainerFrame::TrackSize> : TrueType {};
}
#endif /* nsGridContainerFrame_h___ */
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