gecko-dev/layout/tables/nsTableRowGroupFrame.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef nsTableRowGroupFrame_h__
#define nsTableRowGroupFrame_h__

#include "mozilla/Attributes.h"
#include "nscore.h"
#include "nsContainerFrame.h"
#include "nsAtom.h"
#include "nsILineIterator.h"
#include "nsTArray.h"
#include "nsTableFrame.h"
#include "mozilla/WritingModes.h"

class nsTableRowFrame;
namespace mozilla {
class PresShell;
struct TableRowGroupReflowInput;
}  // namespace mozilla

#define MIN_ROWS_NEEDING_CURSOR 20

/**
 * nsTableRowGroupFrame is the frame that maps row groups
 * (HTML tags THEAD, TFOOT, and TBODY). This class cannot be reused
 * outside of an nsTableFrame.  It assumes that its parent is an nsTableFrame,
 * and its children are nsTableRowFrames.
 *
 * @see nsTableFrame
 * @see nsTableRowFrame
 */
class nsTableRowGroupFrame final : public nsContainerFrame,
                                   public nsILineIterator {
  using TableRowGroupReflowInput = mozilla::TableRowGroupReflowInput;

 public:
  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS(nsTableRowGroupFrame)

  /** instantiate a new instance of nsTableRowFrame.
   * @param aPresShell the pres shell for this frame
   *
   * @return           the frame that was created
   */
  friend nsTableRowGroupFrame* NS_NewTableRowGroupFrame(
      mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
  virtual ~nsTableRowGroupFrame();

  // nsIFrame overrides
  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
                    nsIFrame* aPrevInFlow) override {
    nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
    if (!aPrevInFlow) {
      mWritingMode = GetTableFrame()->GetWritingMode();
    }
  }

  virtual void DestroyFrom(nsIFrame* aDestructRoot,
                           PostDestroyData& aPostDestroyData) override;

  /** @see nsIFrame::DidSetComputedStyle */
  virtual void DidSetComputedStyle(ComputedStyle* aOldComputedStyle) override;

  virtual void AppendFrames(ChildListID aListID,
                            nsFrameList& aFrameList) override;
  virtual void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
                            const nsLineList::iterator* aPrevFrameLine,
                            nsFrameList& aFrameList) override;
  virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;

  virtual nsMargin GetUsedMargin() const override;
  virtual nsMargin GetUsedBorder() const override;
  virtual nsMargin GetUsedPadding() const override;

  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                const nsDisplayListSet& aLists) override;

  /**
   * Calls Reflow for all of its child rows.
   *
   * Rows are all set to the same isize and stacked in the block direction.
   *
   * Rows are not split unless absolutely necessary.
   *
   * @param aDesiredSize isize set to isize of rows, bsize set to
   *                     sum of bsize of rows that fit in AvailableBSize.
   *
   * @see nsIFrame::Reflow
   */
  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
                      nsReflowStatus& aStatus) override;

  virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;

#ifdef DEBUG_FRAME_DUMP
  virtual nsresult GetFrameName(nsAString& aResult) const override;
#endif

  nsTableRowFrame* GetFirstRow();
  nsTableRowFrame* GetLastRow();

  nsTableFrame* GetTableFrame() const {
    nsIFrame* parent = GetParent();
    MOZ_ASSERT(parent && parent->IsTableFrame());
    return static_cast<nsTableFrame*>(parent);
  }

  /** return the number of child rows (not necessarily == number of child
   * frames) */
  int32_t GetRowCount();

  /** return the table-relative row index of the first row in this rowgroup.
   * if there are no rows, -1 is returned.
   */
  int32_t GetStartRowIndex();

  /** Adjust the row indices of all rows  whose index is >= aRowIndex.
   * @param aRowIndex   - start adjusting with this index
   * @param aAdjustment - shift the row index by this amount
   */
  void AdjustRowIndices(int32_t aRowIndex, int32_t anAdjustment);

  // See nsTableFrame.h
  int32_t GetAdjustmentForStoredIndex(int32_t aStoredIndex);

  /* mark rows starting from aStartRowFrame to the next 'aNumRowsToRemove-1'
   * number of rows as deleted
   */
  void MarkRowsAsDeleted(nsTableRowFrame& aStartRowFrame,
                         int32_t aNumRowsToDelete);

  // See nsTableFrame.h
  void AddDeletedRowIndex(int32_t aDeletedRowStoredIndex);

  /**
   * Used for header and footer row group frames that are repeated when
   * splitting a table frame.
   *
   * Performs any table specific initialization
   *
   * @param aHeaderFooterFrame the original header or footer row group frame
   * that was repeated
   */
  nsresult InitRepeatedFrame(nsTableRowGroupFrame* aHeaderFooterFrame);

  /**
   * Get the total bsize of all the row rects
   */
  nscoord GetBSizeBasis(const ReflowInput& aReflowInput);

  mozilla::LogicalMargin GetBCBorderWidth(mozilla::WritingMode aWM);

  /**
   * Gets inner border widths before collapsing with cell borders
   * Caller must get bstart border from previous row group or from table
   * GetContinuousBCBorderWidth will not overwrite aBorder.BStart()
   * see nsTablePainter about continuous borders
   */
  void GetContinuousBCBorderWidth(mozilla::WritingMode aWM,
                                  mozilla::LogicalMargin& aBorder);

  /**
   * Sets full border widths before collapsing with cell borders
   * @param aForSide - side to set; only IEnd, IStart, BEnd are valid
   */
  void SetContinuousBCBorderWidth(mozilla::LogicalSide aForSide,
                                  BCPixelSize aPixelValue);
  /**
   * Adjust to the effect of visibility:collapse on the row group and
   * its children
   * @return              additional shift bstart-wards that should be applied
   *                      to subsequent rowgroups due to rows and this
   *                      rowgroup being collapsed
   * @param aBTotalOffset the total amount that the rowgroup is shifted
   * @param aISize        new isize of the rowgroup
   * @param aWM           the table's writing mode
   */
  nscoord CollapseRowGroupIfNecessary(nscoord aBTotalOffset, nscoord aISize,
                                      mozilla::WritingMode aWM);

  // nsILineIterator methods
 public:
  virtual void DisposeLineIterator() override {}

  // The table row is the equivalent to a line in block layout.
  // The nsILineIterator assumes that a line resides in a block, this role is
  // fullfilled by the row group. Rows in table are counted relative to the
  // table. The row index of row corresponds to the cellmap coordinates. The
  // line index with respect to a row group can be computed by substracting the
  // row index of the first row in the row group.

  /** Get the number of rows in a row group
   * @return the number of lines in a row group
   */
  virtual int32_t GetNumLines() override;

  /** @see nsILineIterator.h GetDirection
   * @return true if the table is rtl
   */
  virtual bool GetDirection() override;

  /** Return structural information about a line.
   * @param aLineNumber       - the index of the row relative to the row group
   *                            If the line-number is invalid then
   *                            aFirstFrameOnLine will be nullptr and
   *                            aNumFramesOnLine will be zero.
   * @param aFirstFrameOnLine - the first cell frame that originates in row
   *                            with a rowindex that matches a line number
   * @param aNumFramesOnLine  - return the numbers of cells originating in
   *                            this row
   * @param aLineBounds       - rect of the row
   */
  NS_IMETHOD GetLine(int32_t aLineNumber, nsIFrame** aFirstFrameOnLine,
                     int32_t* aNumFramesOnLine, nsRect& aLineBounds) override;

  /** Given a frame that's a child of the rowgroup, find which line its on.
   * @param aFrame       - frame, should be a row
   * @param aStartLine   - minimal index to return
   * @return               row index relative to the row group if this a row
   *                       frame and the index is at least aStartLine.
   *                       -1 if the frame cannot be found.
   */
  virtual int32_t FindLineContaining(nsIFrame* aFrame,
                                     int32_t aStartLine = 0) override;

  /** Find the orginating cell frame on a row that is the nearest to the
   * inline-dir coordinate of aPos.
   * @param aLineNumber        - the index of the row relative to the row group
   * @param aPos               - coordinate in twips relative to the
   *                             origin of the row group
   * @param aFrameFound        - pointer to the cellframe
   * @param aPosIsBeforeFirstFrame - the point is before the first originating
   *                               cellframe
   * @param aPosIsAfterLastFrame   - the point is after the last originating
   *                               cellframe
   */
  NS_IMETHOD FindFrameAt(int32_t aLineNumber, nsPoint aPos,
                         nsIFrame** aFrameFound, bool* aPosIsBeforeFirstFrame,
                         bool* aPosIsAfterLastFrame) override;

  /** Check whether visual and logical order of cell frames within a line are
   * identical. As the layout will reorder them this is always the case
   * @param aLine        - the index of the row relative to the table
   * @param aIsReordered - returns false
   * @param aFirstVisual - if the table is rtl first originating cell frame
   * @param aLastVisual  - if the table is rtl last originating cell frame
   */

  NS_IMETHOD CheckLineOrder(int32_t aLine, bool* aIsReordered,
                            nsIFrame** aFirstVisual,
                            nsIFrame** aLastVisual) override;

  /** Find the next originating cell frame that originates in the row.
   * @param aFrame      - cell frame to start with, will return the next cell
   *                      originating in a row
   * @param aLineNumber - the index of the row relative to the table
   */
  NS_IMETHOD GetNextSiblingOnLine(nsIFrame*& aFrame,
                                  int32_t aLineNumber) override;

  // row cursor methods to speed up searching for the row(s)
  // containing a point. The basic idea is that we set the cursor
  // property if the rows' y and yMosts are non-decreasing (considering only
  // rows with nonempty overflowAreas --- empty overflowAreas never participate
  // in event handling or painting), and the rowgroup has sufficient number of
  // rows. The cursor property points to a "recently used" row. If we get a
  // series of requests that work on rows "near" the cursor, then we can find
  // those nearby rows quickly by starting our search at the cursor.
  // This code is based on the line cursor code in nsBlockFrame. It's more
  // general though, and could be extracted and used elsewhere.
  struct FrameCursorData {
    nsTArray<nsIFrame*> mFrames;
    uint32_t mCursorIndex;
    nscoord mOverflowAbove;
    nscoord mOverflowBelow;

    FrameCursorData()
        : mFrames(MIN_ROWS_NEEDING_CURSOR),
          mCursorIndex(0),
          mOverflowAbove(0),
          mOverflowBelow(0) {}

    bool AppendFrame(nsIFrame* aFrame);

    void FinishBuildingCursor() { mFrames.Compact(); }
  };

  // Clear out row cursor because we're disturbing the rows (e.g., Reflow)
  void ClearRowCursor();

  /**
   * Get the first row that might contain y-coord 'aY', or nullptr if you must
   * search all rows.
   * The actual row returned might not contain 'aY', but if not, it is
   * guaranteed to be before any row which does contain 'aY'.
   * aOverflowAbove is the maximum over all rows of -row.GetOverflowRect().y.
   * To find all rows that intersect the vertical interval aY/aYMost, call
   * GetFirstRowContaining(aY, &overflowAbove), and then iterate through all
   * rows until reaching a row where row->GetRect().y - overflowAbove >= aYMost.
   * That row and all subsequent rows cannot intersect the interval.
   */
  nsIFrame* GetFirstRowContaining(nscoord aY, nscoord* aOverflowAbove);

  /**
   * Set up the row cursor. After this, call AppendFrame for every
   * child frame in sibling order. Ensure that the child frame y and YMost
   * values form non-decreasing sequences (should always be true for table
   * rows); if this is violated, call ClearRowCursor(). If we return nullptr,
   * then we decided not to use a cursor or we already have one set up.
   */
  FrameCursorData* SetupRowCursor();

  virtual nsILineIterator* GetLineIterator() override { return this; }

  virtual bool IsFrameOfType(uint32_t aFlags) const override {
    if (aFlags & eSupportsContainLayoutAndPaint) {
      return false;
    }

    return nsContainerFrame::IsFrameOfType(aFlags & ~(nsIFrame::eTablePart));
  }

  virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0,
                               bool aRebuildDisplayItems = true) override;
  virtual void InvalidateFrameWithRect(
      const nsRect& aRect, uint32_t aDisplayItemKey = 0,
      bool aRebuildDisplayItems = true) override;
  virtual void InvalidateFrameForRemoval() override {
    InvalidateFrameSubtree();
  }

 protected:
  explicit nsTableRowGroupFrame(ComputedStyle* aStyle,
                                nsPresContext* aPresContext);

  void InitChildReflowInput(nsPresContext& aPresContext, bool aBorderCollapse,
                            ReflowInput& aReflowInput);

  virtual LogicalSides GetLogicalSkipSides(
      const ReflowInput* aReflowInput = nullptr) const override;

  void PlaceChild(nsPresContext* aPresContext,
                  TableRowGroupReflowInput& aReflowInput, nsIFrame* aKidFrame,
                  const ReflowInput& aKidReflowInput, mozilla::WritingMode aWM,
                  const mozilla::LogicalPoint& aKidPosition,
                  const nsSize& aContainerSize, ReflowOutput& aDesiredSize,
                  const nsRect& aOriginalKidRect,
                  const nsRect& aOriginalKidVisualOverflow);

  void CalculateRowBSizes(nsPresContext* aPresContext,
                          ReflowOutput& aDesiredSize,
                          const ReflowInput& aReflowInput);

  void DidResizeRows(ReflowOutput& aDesiredSize);

  void SlideChild(TableRowGroupReflowInput& aReflowInput, nsIFrame* aKidFrame);

  /**
   * Reflow the frames we've already created
   *
   * @param   aPresContext presentation context to use
   * @param   aReflowInput current inline state
   */
  void ReflowChildren(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      TableRowGroupReflowInput& aReflowInput,
                      nsReflowStatus& aStatus,
                      bool* aPageBreakBeforeEnd = nullptr);

  nsresult SplitRowGroup(nsPresContext* aPresContext,
                         ReflowOutput& aDesiredSize,
                         const ReflowInput& aReflowInput,
                         nsTableFrame* aTableFrame, nsReflowStatus& aStatus,
                         bool aRowForcedPageBreak);

  void SplitSpanningCells(nsPresContext& aPresContext,
                          const ReflowInput& aReflowInput,
                          nsTableFrame& aTableFrame, nsTableRowFrame& aFirstRow,
                          nsTableRowFrame& aLastRow, bool aFirstRowIsTopOfPage,
                          nscoord aSpanningRowBottom,
                          nsTableRowFrame*& aContRowFrame,
                          nsTableRowFrame*& aFirstTruncatedRow,
                          nscoord& aDesiredHeight);

  void CreateContinuingRowFrame(nsPresContext& aPresContext,
                                nsIFrame& aRowFrame, nsIFrame** aContRowFrame);

  bool IsSimpleRowFrame(nsTableFrame* aTableFrame, nsTableRowFrame* aRowFrame);

  void GetNextRowSibling(nsIFrame** aRowFrame);

  void UndoContinuedRow(nsPresContext* aPresContext, nsTableRowFrame* aRow);

 private:
  // border widths in pixels in the collapsing border model
  BCPixelSize mIEndContBorderWidth;
  BCPixelSize mBEndContBorderWidth;
  BCPixelSize mIStartContBorderWidth;

 public:
  bool IsRepeatable() const;
  void SetRepeatable(bool aRepeatable);
  bool HasStyleBSize() const;
  void SetHasStyleBSize(bool aValue);
  bool HasInternalBreakBefore() const;
  bool HasInternalBreakAfter() const;
};

inline bool nsTableRowGroupFrame::IsRepeatable() const {
  return HasAnyStateBits(NS_ROWGROUP_REPEATABLE);
}

inline void nsTableRowGroupFrame::SetRepeatable(bool aRepeatable) {
  if (aRepeatable) {
    AddStateBits(NS_ROWGROUP_REPEATABLE);
  } else {
    RemoveStateBits(NS_ROWGROUP_REPEATABLE);
  }
}

inline bool nsTableRowGroupFrame::HasStyleBSize() const {
  return HasAnyStateBits(NS_ROWGROUP_HAS_STYLE_BSIZE);
}

inline void nsTableRowGroupFrame::SetHasStyleBSize(bool aValue) {
  if (aValue) {
    AddStateBits(NS_ROWGROUP_HAS_STYLE_BSIZE);
  } else {
    RemoveStateBits(NS_ROWGROUP_HAS_STYLE_BSIZE);
  }
}

inline void nsTableRowGroupFrame::GetContinuousBCBorderWidth(
    mozilla::WritingMode aWM, mozilla::LogicalMargin& aBorder) {
  int32_t d2a = PresContext()->AppUnitsPerDevPixel();
  aBorder.IEnd(aWM) = BC_BORDER_START_HALF_COORD(d2a, mIEndContBorderWidth);
  aBorder.BEnd(aWM) = BC_BORDER_START_HALF_COORD(d2a, mBEndContBorderWidth);
  aBorder.IStart(aWM) = BC_BORDER_END_HALF_COORD(d2a, mIStartContBorderWidth);
}
#endif