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128 lines
4.6 KiB
C++
128 lines
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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// vim:cindent:ts=4:et:sw=4:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla's table layout code.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Code to sort cells by their colspan, used by BasicTableLayoutStrategy.
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*/
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#include "pldhash.h"
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#include "nsDebug.h"
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class nsIPresShell;
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/**
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* The SpanningCellSorter is responsible for accumulating lists of cells
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* with colspans so that those cells can later be enumerated, sorted
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* from lowest number of columns spanned to highest. It does not use a
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* stable sort (in fact, it currently reverses).
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*/
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class SpanningCellSorter {
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public:
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SpanningCellSorter(nsIPresShell *aPresShell);
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~SpanningCellSorter();
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struct Item {
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PRInt32 row, col;
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Item *next;
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};
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/**
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* Add a cell to the sorter. Returns false on out of memory.
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* aColSpan is the number of columns spanned, and aRow/aCol are the
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* position of the cell in the table (for GetCellInfoAt).
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*/
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bool AddCell(PRInt32 aColSpan, PRInt32 aRow, PRInt32 aCol);
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/**
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* Get the next *list* of cells. Each list contains all the cells
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* for a colspan value, and the lists are given in order from lowest
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* to highest colspan. The colspan value is filled in to *aColSpan.
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*/
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Item* GetNext(PRInt32 *aColSpan);
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private:
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nsIPresShell *mPresShell;
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enum State { ADDING, ENUMERATING_ARRAY, ENUMERATING_HASH, DONE };
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State mState;
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// store small colspans in an array for fast sorting and
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// enumeration, and large colspans in a hash table
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enum { ARRAY_BASE = 2 };
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enum { ARRAY_SIZE = 8 };
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Item *mArray[ARRAY_SIZE];
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PRInt32 SpanToIndex(PRInt32 aSpan) { return aSpan - ARRAY_BASE; }
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PRInt32 IndexToSpan(PRInt32 aIndex) { return aIndex + ARRAY_BASE; }
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bool UseArrayForSpan(PRInt32 aSpan) {
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NS_ASSERTION(SpanToIndex(aSpan) >= 0, "cell without colspan");
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return SpanToIndex(aSpan) < ARRAY_SIZE;
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}
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PLDHashTable mHashTable;
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struct HashTableEntry : public PLDHashEntryHdr {
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PRInt32 mColSpan;
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Item *mItems;
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};
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static PLDHashTableOps HashTableOps;
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static PLDHashNumber
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HashTableHashKey(PLDHashTable *table, const void *key);
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static bool
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HashTableMatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
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const void *key);
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static PLDHashOperator
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FillSortedArray(PLDHashTable *table, PLDHashEntryHdr *hdr,
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PRUint32 number, void *arg);
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static int SortArray(const void *a, const void *b, void *closure);
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/* state used only during enumeration */
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PRUint32 mEnumerationIndex; // into mArray or mSortedHashTable
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HashTableEntry **mSortedHashTable;
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/*
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* operator new is forbidden since we use the pres shell's stack
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* memory, which much be pushed and popped at points matching a
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* push/pop on the C++ stack.
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*/
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void* operator new(size_t sz) CPP_THROW_NEW { return nsnull; }
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};
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