gecko-dev/layout/tables/nsCellMap.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
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*
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* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
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* the Initial Developer. All Rights Reserved.
*
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*
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef nsCellMap_h__
#define nsCellMap_h__
#include "nscore.h"
#include "celldata.h"
#include "nsTArray.h"
#include "nsTPtrArray.h"
#include "nsRect.h"
#include "nsCOMPtr.h"
#undef DEBUG_TABLE_CELLMAP
class nsTableColFrame;
class nsTableCellFrame;
class nsTableRowFrame;
class nsTableRowGroupFrame;
class nsTableFrame;
class nsCellMap;
class nsPresContext;
class nsCellMapColumnIterator;
struct nsColInfo
{
PRInt32 mNumCellsOrig; // number of cells originating in the col
PRInt32 mNumCellsSpan; // number of cells spanning into the col via colspans (not rowspans)
nsColInfo();
nsColInfo(PRInt32 aNumCellsOrig,
PRInt32 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,
PRBool 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(PRInt32 aRowIndex,
PRInt32 aColIndex,
CellData& aData,
PRBool aUseRowIfOverlap) const;
/** return the CellData for the cell at (aRowIndex, aColIndex) */
CellData* GetDataAt(PRInt32 aRowIndex,
PRInt32 aColIndex) const;
// this function creates a col if needed
nsColInfo* GetColInfoAt(PRInt32 aColIndex);
/** append the cellFrame at the end of the row at aRowIndex and return the col index
*/
CellData* AppendCell(nsTableCellFrame& aCellFrame,
PRInt32 aRowIndex,
PRBool aRebuildIfNecessary,
nsRect& aDamageArea);
void InsertCells(nsTArray<nsTableCellFrame*>& aCellFrames,
PRInt32 aRowIndex,
PRInt32 aColIndexBefore,
nsRect& aDamageArea);
void RemoveCell(nsTableCellFrame* aCellFrame,
PRInt32 aRowIndex,
nsRect& aDamageArea);
/** Remove the previously gathered column information */
void ClearCols();
void InsertRows(nsTableRowGroupFrame& aRowGroup,
nsTArray<nsTableRowFrame*>& aRows,
PRInt32 aFirstRowIndex,
PRBool aConsiderSpans,
nsRect& aDamageArea);
void RemoveRows(PRInt32 aFirstRowIndex,
PRInt32 aNumRowsToRemove,
PRBool aConsiderSpans,
nsRect& aDamageArea);
PRInt32 GetNumCellsOriginatingInRow(PRInt32 aRowIndex) const;
PRInt32 GetNumCellsOriginatingInCol(PRInt32 aColIndex) const;
/** indicate whether the row has more than one cell that either originates
* or is spanned from the rows above
*/
PRBool HasMoreThanOneCell(PRInt32 aRowIndex) const;
PRInt32 GetEffectiveRowSpan(PRInt32 aRowIndex,
PRInt32 aColIndex) const;
PRInt32 GetEffectiveColSpan(PRInt32 aRowIndex,
PRInt32 aColIndex) const;
/** return the total number of columns in the table represented by this CellMap */
PRInt32 GetColCount() const;
/** return the actual number of rows in the table represented by this CellMap */
PRInt32 GetRowCount() const;
nsTableCellFrame* GetCellInfoAt(PRInt32 aRowX,
PRInt32 aColX,
PRBool* aOriginates = nsnull,
PRInt32* aColSpan = nsnull) 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
*/
PRInt32 GetIndexByRowAndColumn(PRInt32 aRow, PRInt32 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(PRInt32 aIndex,
PRInt32 *aRow, PRInt32 *aColumn) const;
void AddColsAtEnd(PRUint32 aNumCols);
void RemoveColsAtEnd();
PRBool RowIsSpannedInto(PRInt32 aRowIndex, PRInt32 aNumEffCols) const;
PRBool RowHasSpanningCells(PRInt32 aRowIndex, PRInt32 aNumEffCols) const;
void RebuildConsideringCells(nsCellMap* aCellMap,
nsTArray<nsTableCellFrame*>* aCellFrames,
PRInt32 aRowIndex,
PRInt32 aColIndex,
PRBool aInsert,
nsRect& 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,
PRInt32 aStartRowIndex,
nsTArray<nsTableRowFrame*>* aRowsToInsert,
PRInt32 aNumRowsToRemove,
nsRect& aDamageArea);
public:
PRBool ColIsSpannedInto(PRInt32 aColIndex) const;
PRBool ColHasSpanningCells(PRInt32 aColIndex) const;
void ExpandZeroColSpans();
void SetNotTopStart(PRUint8 aSide,
nsCellMap& aCellMap,
PRUint32 aYPos,
PRUint32 aXPos,
PRBool aIsLowerRight = PR_FALSE);
void SetBCBorderEdge(PRUint8 aEdge,
nsCellMap& aCellMap,
PRUint32 aCellMapStart,
PRUint32 aYPos,
PRUint32 aXPos,
PRUint32 aLength,
BCBorderOwner aOwner,
nscoord aSize,
PRBool aChanged);
void SetBCBorderCorner(Corner aCorner,
nsCellMap& aCellMap,
PRUint32 aCellMapStart,
PRUint32 aYPos,
PRUint32 aXPos,
PRUint8 aOwner,
nscoord aSubSize,
PRBool aBevel,
PRBool aIsBottomRight = PR_FALSE);
/** dump a representation of the cell map to stdout for debugging */
#ifdef NS_DEBUG
void Dump(char* aString = nsnull) const;
#endif
protected:
BCData* GetRightMostBorder(PRInt32 aRowIndex);
BCData* GetBottomMostBorder(PRInt32 aColIndex);
friend class nsCellMap;
friend class BCMapCellIterator;
friend class BCMapBorderIterator;
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, PRBool aIsBC);
/** destructor
* NOT VIRTUAL BECAUSE THIS CLASS SHOULD **NEVER** BE SUBCLASSED
*/
~nsCellMap();
static nsresult Init();
static void Shutdown();
nsCellMap* GetNextSibling() const;
void SetNextSibling(nsCellMap* aSibling);
nsTableRowGroupFrame* GetRowGroup() const;
nsTableCellFrame* GetCellFrame(PRInt32 aRowIndex,
PRInt32 aColIndex,
CellData& aData,
PRBool aUseRowSpanIfOverlap) const;
/**
* Returns highest cell index within the cell map.
*
* @param aColCount [in] the number of columns in the table
*/
PRInt32 GetHighestIndex(PRInt32 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
*/
PRInt32 GetIndexByRowAndColumn(PRInt32 aColCount,
PRInt32 aRow, PRInt32 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(PRInt32 aColCount, PRInt32 aIndex,
PRInt32 *aRow, PRInt32 *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,
PRInt32 aRowIndex,
PRBool aRebuildIfNecessary,
nsRect& aDamageArea,
PRInt32* aBeginSearchAtCol = nsnull);
/** 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,
PRInt32 aRowIndex,
PRInt32 aColIndex);
void InsertCells(nsTableCellMap& aMap,
nsTArray<nsTableCellFrame*>& aCellFrames,
PRInt32 aRowIndex,
PRInt32 aColIndexBefore,
nsRect& aDamageArea);
void RemoveCell(nsTableCellMap& aMap,
nsTableCellFrame* aCellFrame,
PRInt32 aRowIndex,
nsRect& aDamageArea);
void InsertRows(nsTableCellMap& aMap,
nsTArray<nsTableRowFrame*>& aRows,
PRInt32 aFirstRowIndex,
PRBool aConsiderSpans,
nsRect& aDamageArea);
void RemoveRows(nsTableCellMap& aMap,
PRInt32 aFirstRowIndex,
PRInt32 aNumRowsToRemove,
PRBool aConsiderSpans,
nsRect& aDamageArea);
PRInt32 GetNumCellsOriginatingInRow(PRInt32 aRowIndex) const;
PRInt32 GetNumCellsOriginatingInCol(PRInt32 aColIndex) const;
/** return the number of rows in the table represented by this CellMap */
PRInt32 GetRowCount(PRBool aConsiderDeadRowSpanRows = PR_FALSE) const;
nsTableCellFrame* GetCellInfoAt(const nsTableCellMap& aMap,
PRInt32 aRowX,
PRInt32 aColX,
PRBool* aOriginates = nsnull,
PRInt32* aColSpan = nsnull) const;
PRBool RowIsSpannedInto(PRInt32 aRowIndex,
PRInt32 aNumEffCols) const;
PRBool RowHasSpanningCells(PRInt32 aRowIndex,
PRInt32 aNumEffCols) const;
PRBool ColHasSpanningCells(PRInt32 aColIndex) const;
void ExpandZeroColSpans(nsTableCellMap& aMap);
/** indicate whether the row has more than one cell that either originates
* or is spanned from the rows above
*/
PRBool HasMoreThanOneCell(PRInt32 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.
*/
PRInt32 GetRowSpan(PRInt32 aRowIndex,
PRInt32 aColIndex,
PRBool aGetEffective) const;
PRInt32 GetEffectiveColSpan(const nsTableCellMap& aMap,
PRInt32 aRowIndex,
PRInt32 aColIndex,
PRBool& aIsZeroColSpan) const;
typedef nsTPtrArray<CellData> CellDataArray;
/** dump a representation of the cell map to stdout for debugging */
#ifdef NS_DEBUG
void Dump(PRBool aIsBorderCollapse) const;
#endif
protected:
friend class nsTableCellMap;
friend class BCMapCellIterator;
friend class BCMapBorderIterator;
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.
*/
PRBool Grow(nsTableCellMap& aMap,
PRInt32 aNumRows,
PRInt32 aRowIndex = -1);
void GrowRow(CellDataArray& aRow,
PRInt32 aNumCols);
/** assign aCellData to the cell at (aRow,aColumn) */
void SetDataAt(nsTableCellMap& aMap,
CellData& aCellData,
PRInt32 aMapRowIndex,
PRInt32 aColIndex);
CellData* GetDataAt(PRInt32 aMapRowIndex,
PRInt32 aColIndex) const;
PRInt32 GetNumCellsIn(PRInt32 aColIndex) const;
void ExpandWithRows(nsTableCellMap& aMap,
nsTArray<nsTableRowFrame*>& aRowFrames,
PRInt32 aStartRowIndex,
nsRect& aDamageArea);
void ExpandWithCells(nsTableCellMap& aMap,
nsTArray<nsTableCellFrame*>& aCellFrames,
PRInt32 aRowIndex,
PRInt32 aColIndex,
PRInt32 aRowSpan,
PRBool aRowSpanIsZero,
nsRect& aDamageArea);
void ShrinkWithoutRows(nsTableCellMap& aMap,
PRInt32 aFirstRowIndex,
PRInt32 aNumRowsToRemove,
nsRect& aDamageArea);
void ShrinkWithoutCell(nsTableCellMap& aMap,
nsTableCellFrame& aCellFrame,
PRInt32 aRowIndex,
PRInt32 aColIndex,
nsRect& 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,
PRInt32 aStartRowIndex,
nsTArray<nsTableRowFrame*>* aRowsToInsert,
PRInt32 aNumRowsToRemove,
nsRect& aDamageArea);
void RebuildConsideringCells(nsTableCellMap& aMap,
PRInt32 aNumOrigCols,
nsTArray<nsTableCellFrame*>* aCellFrames,
PRInt32 aRowIndex,
PRInt32 aColIndex,
PRBool aInsert,
nsRect& aDamageArea);
PRBool 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
*/
PRBool CellsSpanInOrOut(PRInt32 aStartRowIndex,
PRInt32 aEndRowIndex,
PRInt32 aStartColIndex,
PRInt32 aEndColIndex) const;
void ExpandForZeroSpan(nsTableCellFrame* aCellFrame,
PRInt32 aNumColsInTable);
PRBool CreateEmptyRow(PRInt32 aRowIndex,
PRInt32 aNumCols);
PRInt32 GetRowSpanForNewCell(nsTableCellFrame* aCellFrameToAdd,
PRInt32 aRowIndex,
PRBool& aIsZeroRowSpan) const;
PRInt32 GetColSpanForNewCell(nsTableCellFrame& aCellFrameToAdd,
PRBool& aIsZeroColSpan) const;
PRBool IsZeroColSpan(PRInt32 aRowIndex,
PRInt32 aColIndex) 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
*/
PRInt32 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
PRBool mIsBC;
// Prescontext to deallocate and allocate celldata
nsCOMPtr<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, PRInt32 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();
PRUint32 rowArrayLength = mCurMap->mRows.Length();
mCurMapRelevantRowCount = PR_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(PRInt32* aRow, PRInt32* 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(PRInt32 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.
PRUint32 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.
PRUint32 mCurMapRow;
const PRInt32 mCol;
PRUint32 mOrigCells;
PRUint32 mFoundCells;
// The number of content rows in mCurMap. This may be bigger than the number
// of "relevant" rows, or it might be smaller.
PRUint32 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.
PRUint32 mCurMapRelevantRowCount;
};
/* ----- inline methods ----- */
inline PRInt32 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 PRInt32 nsCellMap::GetRowCount(PRBool aConsiderDeadRowSpanRows) const
{
PRInt32 rowCount = (aConsiderDeadRowSpanRows) ? mRows.Length() : mContentRowCount;
return rowCount;
}
// nsColInfo
inline nsColInfo::nsColInfo()
:mNumCellsOrig(0), mNumCellsSpan(0)
{}
inline nsColInfo::nsColInfo(PRInt32 aNumCellsOrig,
PRInt32 aNumCellsSpan)
:mNumCellsOrig(aNumCellsOrig), mNumCellsSpan(aNumCellsSpan)
{}
#endif