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gecko-dev/layout/tables/nsCellMap.h

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/* -*- 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 nsCellMap_h__
#define nsCellMap_h__
#include "nscore.h"
#include "celldata.h"
#include "nsTArray.h"
#include "nsTArray.h"
#include "nsCOMPtr.h"
#include "nsAlgorithm.h"
#include "nsAutoPtr.h"
#include <algorithm>
#undef DEBUG_TABLE_CELLMAP
class nsTableColFrame;
class nsTableCellFrame;
class nsTableRowFrame;
class nsTableRowGroupFrame;
class nsTableFrame;
class nsCellMap;
class nsPresContext;
class nsCellMapColumnIterator;
struct nsIntRect;
struct nsColInfo
{
int32_t mNumCellsOrig; // number of cells originating in the col
int32_t mNumCellsSpan; // number of cells spanning into the col via colspans (not rowspans)
nsColInfo();
nsColInfo(int32_t aNumCellsOrig,
int32_t aNumCellsSpan);
};
enum Corner
{
eTopLeft = 0,
eTopRight = 1,
eBottomRight = 2,
eBottomLeft = 3
};
struct BCInfo
{
nsTArray<BCData> mRightBorders;
nsTArray<BCData> mBottomBorders;
BCData mLowerRightCorner;
};
class nsTableCellMap
{
public:
nsTableCellMap(nsTableFrame& aTableFrame,
bool aBorderCollapse);
/** destructor
* NOT VIRTUAL BECAUSE THIS CLASS SHOULD **NEVER** BE SUBCLASSED
*/
~nsTableCellMap();
void RemoveGroupCellMap(nsTableRowGroupFrame* aRowGroup);
void InsertGroupCellMap(nsTableRowGroupFrame* aNewRowGroup,
nsTableRowGroupFrame*& aPrevRowGroup);
/**
* Get the nsCellMap for the given row group. If aStartHint is non-null,
* will start looking with that cellmap and only fall back to starting at the
* beginning of the list if that doesn't find us the right nsCellMap.
* Otherwise, just start at the beginning.
*
* aRowGroup must not be null.
*/
nsCellMap* GetMapFor(const nsTableRowGroupFrame* aRowGroup,
nsCellMap* aStartHint) const;
/** synchronize the cellmaps with the rowgroups again **/
void Synchronize(nsTableFrame* aTableFrame);
nsTableCellFrame* GetCellFrame(int32_t aRowIndex,
int32_t aColIndex,
CellData& aData,
bool aUseRowIfOverlap) const;
/** return the CellData for the cell at (aRowIndex, aColIndex) */
CellData* GetDataAt(int32_t aRowIndex,
int32_t aColIndex) const;
// this function creates a col if needed
nsColInfo* GetColInfoAt(int32_t aColIndex);
/** append the cellFrame at the end of the row at aRowIndex and return the col index
*/
CellData* AppendCell(nsTableCellFrame& aCellFrame,
int32_t aRowIndex,
bool aRebuildIfNecessary,
nsIntRect& aDamageArea);
void InsertCells(nsTArray<nsTableCellFrame*>& aCellFrames,
int32_t aRowIndex,
int32_t aColIndexBefore,
nsIntRect& aDamageArea);
void RemoveCell(nsTableCellFrame* aCellFrame,
int32_t aRowIndex,
nsIntRect& aDamageArea);
/** Remove the previously gathered column information */
void ClearCols();
void InsertRows(nsTableRowGroupFrame* aRowGroup,
nsTArray<nsTableRowFrame*>& aRows,
int32_t aFirstRowIndex,
bool aConsiderSpans,
nsIntRect& aDamageArea);
void RemoveRows(int32_t aFirstRowIndex,
int32_t aNumRowsToRemove,
bool aConsiderSpans,
nsIntRect& aDamageArea);
int32_t GetNumCellsOriginatingInRow(int32_t aRowIndex) const;
int32_t GetNumCellsOriginatingInCol(int32_t aColIndex) const;
/** indicate whether the row has more than one cell that either originates
* or is spanned from the rows above
*/
bool HasMoreThanOneCell(int32_t aRowIndex) const;
int32_t GetEffectiveRowSpan(int32_t aRowIndex,
int32_t aColIndex) const;
int32_t GetEffectiveColSpan(int32_t aRowIndex,
int32_t aColIndex) const;
/** return the total number of columns in the table represented by this CellMap */
int32_t GetColCount() const;
/** return the actual number of rows in the table represented by this CellMap */
int32_t GetRowCount() const;
nsTableCellFrame* GetCellInfoAt(int32_t aRowX,
int32_t aColX,
bool* aOriginates = nullptr,
int32_t* aColSpan = nullptr) const;
/**
* Returns the index at the given row and column coordinates.
*
* @see nsITableLayout::GetIndexByRowAndColumn()
*
* @param aRow [in] the row coordinate
* @param aColumn [in] the column coordinate
* @returns the index for the cell
*/
int32_t GetIndexByRowAndColumn(int32_t aRow, int32_t aColumn) const;
/**
* Retrieves the row and column coordinates for the given index.
*
* @see nsITableLayout::GetRowAndColumnByIndex()
*
* @param aIndex [in] the index for which coordinates are to be retrieved
* @param aRow [out] the row coordinate to be returned
* @param aColumn [out] the column coordinate to be returned
*/
void GetRowAndColumnByIndex(int32_t aIndex,
int32_t *aRow, int32_t *aColumn) const;
void AddColsAtEnd(uint32_t aNumCols);
void RemoveColsAtEnd();
bool RowIsSpannedInto(int32_t aRowIndex, int32_t aNumEffCols) const;
bool RowHasSpanningCells(int32_t aRowIndex, int32_t aNumEffCols) const;
void RebuildConsideringCells(nsCellMap* aCellMap,
nsTArray<nsTableCellFrame*>* aCellFrames,
int32_t aRowIndex,
int32_t aColIndex,
bool aInsert,
nsIntRect& aDamageArea);
protected:
/**
* Rebuild due to rows being inserted or deleted with cells spanning
* into or out of the rows. This function can only handle insertion
* or deletion but NOT both. So either aRowsToInsert must be null
* or aNumRowsToRemove must be 0.
*
* // XXXbz are both allowed to happen? That'd be a no-op...
*/
void RebuildConsideringRows(nsCellMap* aCellMap,
int32_t aStartRowIndex,
nsTArray<nsTableRowFrame*>* aRowsToInsert,
int32_t aNumRowsToRemove,
nsIntRect& aDamageArea);
public:
void ExpandZeroColSpans();
void ResetTopStart(uint8_t aSide,
nsCellMap& aCellMap,
uint32_t aYPos,
uint32_t aXPos,
bool aIsLowerRight = false);
void SetBCBorderEdge(mozilla::Side aEdge,
nsCellMap& aCellMap,
uint32_t aCellMapStart,
uint32_t aYPos,
uint32_t aXPos,
uint32_t aLength,
BCBorderOwner aOwner,
nscoord aSize,
bool aChanged);
void SetBCBorderCorner(::Corner aCorner,
nsCellMap& aCellMap,
uint32_t aCellMapStart,
uint32_t aYPos,
uint32_t aXPos,
mozilla::Side aOwner,
nscoord aSubSize,
bool aBevel,
bool aIsBottomRight = false);
/** dump a representation of the cell map to stdout for debugging */
#ifdef DEBUG
void Dump(char* aString = nullptr) const;
#endif
protected:
BCData* GetRightMostBorder(int32_t aRowIndex);
BCData* GetBottomMostBorder(int32_t aColIndex);
friend class nsCellMap;
friend class BCMapCellIterator;
friend class BCPaintBorderIterator;
friend class nsCellMapColumnIterator;
/** Insert a row group cellmap after aPrevMap, if aPrefMap is null insert it
* at the beginning, the ordering of the cellmap corresponds to the ordering of
* rowgroups once OrderRowGroups has been called
*/
void InsertGroupCellMap(nsCellMap* aPrevMap,
nsCellMap& aNewMap);
void DeleteRightBottomBorders();
nsTableFrame& mTableFrame;
nsAutoTArray<nsColInfo, 8> mCols;
nsCellMap* mFirstMap;
// border collapsing info
BCInfo* mBCInfo;
};
/** nsCellMap is a support class for nsTablePart.
* It maintains an Rows x Columns grid onto which the cells of the table are mapped.
* This makes processing of rowspan and colspan attributes much easier.
* Each cell is represented by a CellData object.
*
* @see CellData
* @see nsTableFrame::AddCellToMap
* @see nsTableFrame::GrowCellMap
* @see nsTableFrame::BuildCellIntoMap
*
* mRows is an array of rows. Each row is an array of cells. a cell
* can be null.
*/
class nsCellMap
{
public:
/** constructor
* @param aRowGroupFrame the row group frame this is a cellmap for
* @param aIsBC whether the table is doing border-collapse
*/
nsCellMap(nsTableRowGroupFrame* aRowGroupFrame, bool aIsBC);
/** destructor
* NOT VIRTUAL BECAUSE THIS CLASS SHOULD **NEVER** BE SUBCLASSED
*/
~nsCellMap();
static void Init();
static void Shutdown();
nsCellMap* GetNextSibling() const;
void SetNextSibling(nsCellMap* aSibling);
nsTableRowGroupFrame* GetRowGroup() const;
nsTableCellFrame* GetCellFrame(int32_t aRowIndex,
int32_t aColIndex,
CellData& aData,
bool aUseRowSpanIfOverlap) const;
/**
* Returns highest cell index within the cell map.
*
* @param aColCount [in] the number of columns in the table
*/
int32_t GetHighestIndex(int32_t aColCount);
/**
* Returns the index of the given row and column coordinates.
*
* @see nsITableLayout::GetIndexByRowAndColumn()
*
* @param aColCount [in] the number of columns in the table
* @param aRow [in] the row coordinate
* @param aColumn [in] the column coordinate
*/
int32_t GetIndexByRowAndColumn(int32_t aColCount,
int32_t aRow, int32_t aColumn) const;
/**
* Get the row and column coordinates at the given index.
*
* @see nsITableLayout::GetRowAndColumnByIndex()
*
* @param aColCount [in] the number of columns in the table
* @param aIndex [in] the index for which coordinates are to be retrieved
* @param aRow [out] the row coordinate to be returned
* @param aColumn [out] the column coordinate to be returned
*/
void GetRowAndColumnByIndex(int32_t aColCount, int32_t aIndex,
int32_t *aRow, int32_t *aColumn) const;
/** append the cellFrame at an empty or dead cell or finally at the end of
* the row at aRowIndex and return a pointer to the celldata entry in the
* cellmap
*
* @param aMap - reference to the table cell map
* @param aCellFrame - a pointer to the cellframe which will be appended
* to the row
* @param aRowIndex - to this row the celldata entry will be added
* @param aRebuildIfNecessay - if a cell spans into a row below it might be
* necesserary to rebuild the cellmap as this rowspan
* might overlap another cell.
* @param aDamageArea - area in cellmap coordinates which have been updated.
* @param aColToBeginSearch - if not null contains the column number where
* the search for a empty or dead cell in the
* row should start
* @return - a pointer to the celldata entry inserted into
* the cellmap
*/
CellData* AppendCell(nsTableCellMap& aMap,
nsTableCellFrame* aCellFrame,
int32_t aRowIndex,
bool aRebuildIfNecessary,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea,
int32_t* aBeginSearchAtCol = nullptr);
/** Function to be called when a cell is added at a location which is spanned
* to by a zero colspan. We handle this situation by collapsing the zero
* colspan, since there is really no good way to deal with it (trying to
* increase the number of columns to hold the new cell would just mean the
* zero colspan needs to expand).
* @param aMap - reference to the table cell map
* @param aOrigData - zero colspanned cell that will be collapsed
* @param aRowIndex - row where the first collision appears
* @param aColIndex - column where the first collision appears
**/
void CollapseZeroColSpan(nsTableCellMap& aMap,
CellData* aOrigData,
int32_t aRowIndex,
int32_t aColIndex);
void InsertCells(nsTableCellMap& aMap,
nsTArray<nsTableCellFrame*>& aCellFrames,
int32_t aRowIndex,
int32_t aColIndexBefore,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
void RemoveCell(nsTableCellMap& aMap,
nsTableCellFrame* aCellFrame,
int32_t aRowIndex,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
void InsertRows(nsTableCellMap& aMap,
nsTArray<nsTableRowFrame*>& aRows,
int32_t aFirstRowIndex,
bool aConsiderSpans,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
void RemoveRows(nsTableCellMap& aMap,
int32_t aFirstRowIndex,
int32_t aNumRowsToRemove,
bool aConsiderSpans,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
int32_t GetNumCellsOriginatingInRow(int32_t aRowIndex) const;
int32_t GetNumCellsOriginatingInCol(int32_t aColIndex) const;
/** return the number of rows in the table represented by this CellMap */
int32_t GetRowCount(bool aConsiderDeadRowSpanRows = false) const;
nsTableCellFrame* GetCellInfoAt(const nsTableCellMap& aMap,
int32_t aRowX,
int32_t aColX,
bool* aOriginates = nullptr,
int32_t* aColSpan = nullptr) const;
bool RowIsSpannedInto(int32_t aRowIndex,
int32_t aNumEffCols) const;
bool RowHasSpanningCells(int32_t aRowIndex,
int32_t aNumEffCols) const;
void ExpandZeroColSpans(nsTableCellMap& aMap);
/** indicate whether the row has more than one cell that either originates
* or is spanned from the rows above
*/
bool HasMoreThanOneCell(int32_t aRowIndex) const;
/* Get the rowspan for a cell starting at aRowIndex and aColIndex.
* If aGetEffective is true the size will not exceed the last content based
* row. Cells can have a specified rowspan that extends below the last
* content based row. This is legitimate considering incr. reflow where the
* content rows will arive later.
*/
int32_t GetRowSpan(int32_t aRowIndex,
int32_t aColIndex,
bool aGetEffective) const;
int32_t GetEffectiveColSpan(const nsTableCellMap& aMap,
int32_t aRowIndex,
int32_t aColIndex,
bool& aIsZeroColSpan) const;
typedef nsTArray<CellData*> CellDataArray;
/** dump a representation of the cell map to stdout for debugging */
#ifdef DEBUG
void Dump(bool aIsBorderCollapse) const;
#endif
protected:
friend class nsTableCellMap;
friend class BCMapCellIterator;
friend class BCPaintBorderIterator;
friend class nsTableFrame;
friend class nsCellMapColumnIterator;
/**
* Increase the number of rows in this cellmap by aNumRows. Put the
* new rows at aRowIndex. If aRowIndex is -1, put them at the end.
*/
bool Grow(nsTableCellMap& aMap,
int32_t aNumRows,
int32_t aRowIndex = -1);
void GrowRow(CellDataArray& aRow,
int32_t aNumCols);
/** assign aCellData to the cell at (aRow,aColumn) */
void SetDataAt(nsTableCellMap& aMap,
CellData& aCellData,
int32_t aMapRowIndex,
int32_t aColIndex);
CellData* GetDataAt(int32_t aMapRowIndex,
int32_t aColIndex) const;
int32_t GetNumCellsIn(int32_t aColIndex) const;
void ExpandWithRows(nsTableCellMap& aMap,
nsTArray<nsTableRowFrame*>& aRowFrames,
int32_t aStartRowIndex,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
void ExpandWithCells(nsTableCellMap& aMap,
nsTArray<nsTableCellFrame*>& aCellFrames,
int32_t aRowIndex,
int32_t aColIndex,
int32_t aRowSpan,
bool aRowSpanIsZero,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
void ShrinkWithoutRows(nsTableCellMap& aMap,
int32_t aFirstRowIndex,
int32_t aNumRowsToRemove,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
void ShrinkWithoutCell(nsTableCellMap& aMap,
nsTableCellFrame& aCellFrame,
int32_t aRowIndex,
int32_t aColIndex,
int32_t aRgFirstRowIndex,
nsIntRect& aDamageArea);
/**
* Rebuild due to rows being inserted or deleted with cells spanning
* into or out of the rows. This function can only handle insertion
* or deletion but NOT both. So either aRowsToInsert must be null
* or aNumRowsToRemove must be 0.
*
* // XXXbz are both allowed to happen? That'd be a no-op...
*/
void RebuildConsideringRows(nsTableCellMap& aMap,
int32_t aStartRowIndex,
nsTArray<nsTableRowFrame*>* aRowsToInsert,
int32_t aNumRowsToRemove);
void RebuildConsideringCells(nsTableCellMap& aMap,
int32_t aNumOrigCols,
nsTArray<nsTableCellFrame*>* aCellFrames,
int32_t aRowIndex,
int32_t aColIndex,
bool aInsert);
bool CellsSpanOut(nsTArray<nsTableRowFrame*>& aNewRows) const;
/** If a cell spans out of the area defined by aStartRowIndex, aEndRowIndex
* and aStartColIndex, aEndColIndex the cellmap changes are more severe so
* the corresponding routines needs to be called. This is also necessary if
* cells outside spans into this region.
* @aStartRowIndex - y start index
* @aEndRowIndex - y end index
* @param aStartColIndex - x start index
* @param aEndColIndex - x end index
* @return - true if a cell span crosses the border of the
region
*/
bool CellsSpanInOrOut(int32_t aStartRowIndex,
int32_t aEndRowIndex,
int32_t aStartColIndex,
int32_t aEndColIndex) const;
void ExpandForZeroSpan(nsTableCellFrame* aCellFrame,
int32_t aNumColsInTable);
bool CreateEmptyRow(int32_t aRowIndex,
int32_t aNumCols);
int32_t GetRowSpanForNewCell(nsTableCellFrame* aCellFrameToAdd,
int32_t aRowIndex,
bool& aIsZeroRowSpan) const;
int32_t GetColSpanForNewCell(nsTableCellFrame& aCellFrameToAdd,
bool& aIsZeroColSpan) const;
// Destroy a CellData struct. This will handle the case of aData
// actually being a BCCellData properly.
void DestroyCellData(CellData* aData);
// Allocate a CellData struct. This will handle needing to create a
// BCCellData properly.
// @param aOrigCell the originating cell to pass to the celldata constructor
CellData* AllocCellData(nsTableCellFrame* aOrigCell);
/** an array containing, for each row, the CellDatas for the cells
* in that row. It can be larger than mContentRowCount due to row spans
* extending beyond the table */
// XXXbz once we have auto TArrays, we should probably use them here.
nsTArray<CellDataArray> mRows;
/** the number of rows in the table (content) which is not indentical to the
* number of rows in the cell map due to row spans extending beyond the end
* of thetable (dead rows) or empty tr tags
*/
int32_t mContentRowCount;
// the row group that corresponds to this map
nsTableRowGroupFrame* mRowGroupFrame;
// the next row group cell map
nsCellMap* mNextSibling;
// Whether this is a BC cellmap or not
bool mIsBC;
// Prescontext to deallocate and allocate celldata
nsRefPtr<nsPresContext> mPresContext;
};
/**
* A class for iterating the cells in a given column. Must be given a
* non-null nsTableCellMap and a column number valid for that cellmap.
*/
class nsCellMapColumnIterator
{
public:
nsCellMapColumnIterator(const nsTableCellMap* aMap, int32_t aCol) :
mMap(aMap), mCurMap(aMap->mFirstMap), mCurMapStart(0),
mCurMapRow(0), mCol(aCol), mFoundCells(0)
{
NS_PRECONDITION(aMap, "Must have map");
NS_PRECONDITION(mCol < aMap->GetColCount(), "Invalid column");
mOrigCells = aMap->GetNumCellsOriginatingInCol(mCol);
if (mCurMap) {
mCurMapContentRowCount = mCurMap->GetRowCount();
uint32_t rowArrayLength = mCurMap->mRows.Length();
mCurMapRelevantRowCount = std::min(mCurMapContentRowCount, rowArrayLength);
if (mCurMapRelevantRowCount == 0 && mOrigCells > 0) {
// This row group is useless; advance!
AdvanceRowGroup();
}
}
#ifdef DEBUG
else {
NS_ASSERTION(mOrigCells == 0, "Why no rowgroups?");
}
#endif
}
nsTableCellFrame* GetNextFrame(int32_t* aRow, int32_t* aColSpan);
private:
void AdvanceRowGroup();
// Advance the row; aIncrement is considered to be a cell's rowspan,
// so if 0 is passed in we'll advance to the next rowgroup.
void IncrementRow(int32_t aIncrement);
const nsTableCellMap* mMap;
const nsCellMap* mCurMap;
// mCurMapStart is the row in the entire nsTableCellMap where
// mCurMap starts. This is used to compute row indices to pass to
// nsTableCellMap::GetDataAt, so must be a _content_ row index.
uint32_t mCurMapStart;
// In steady-state mCurMapRow is the row in our current nsCellMap
// that we'll use the next time GetNextFrame() is called. Due to
// the way we skip over rowspans, the entry in mCurMapRow and mCol
// is either null, dead, originating, or a colspan. In particular,
// it cannot be a rowspan or overlap entry.
uint32_t mCurMapRow;
const int32_t mCol;
uint32_t mOrigCells;
uint32_t mFoundCells;
// The number of content rows in mCurMap. This may be bigger than the number
// of "relevant" rows, or it might be smaller.
uint32_t mCurMapContentRowCount;
// The number of "relevant" rows in mCurMap. That is, the number of rows
// which might have an originating cell in them. Once mCurMapRow reaches
// mCurMapRelevantRowCount, we should move to the next map.
uint32_t mCurMapRelevantRowCount;
};
/* ----- inline methods ----- */
inline int32_t nsTableCellMap::GetColCount() const
{
return mCols.Length();
}
inline nsCellMap* nsCellMap::GetNextSibling() const
{
return mNextSibling;
}
inline void nsCellMap::SetNextSibling(nsCellMap* aSibling)
{
mNextSibling = aSibling;
}
inline nsTableRowGroupFrame* nsCellMap::GetRowGroup() const
{
return mRowGroupFrame;
}
inline int32_t nsCellMap::GetRowCount(bool aConsiderDeadRowSpanRows) const
{
int32_t rowCount = (aConsiderDeadRowSpanRows) ? mRows.Length() : mContentRowCount;
return rowCount;
}
// nsColInfo
inline nsColInfo::nsColInfo()
:mNumCellsOrig(0), mNumCellsSpan(0)
{}
inline nsColInfo::nsColInfo(int32_t aNumCellsOrig,
int32_t aNumCellsSpan)
:mNumCellsOrig(aNumCellsOrig), mNumCellsSpan(aNumCellsSpan)
{}
#endif
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