62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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// This class implements a tree header that can operate in one of three states, in
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// the following order:
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//
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// - no sort (natural order)
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// - sort forwards
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// - sort backwards
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//
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// When it reaches the end, it cycles back to the start (no sort).
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#include "CTriStateTableHeader.h"
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CTriStateTableHeader::CTriStateTableHeader ( LStream* inStream )
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: LTableViewHeader(inStream)
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{
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}
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CTriStateTableHeader :: ~CTriStateTableHeader ( )
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{
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}
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//
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// CycleSortDirection
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//
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// Called when the user clicks (not drags) in a column header.
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//
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bool
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CTriStateTableHeader :: CycleSortDirection ( ColumnIndexT & ioColumn )
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{
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if ( ioColumn == mSortedColumn ) {
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if ( mSortedBackwards ) {
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ioColumn = LArray::index_Bad;
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mSortedBackwards = true; // so inversion below will set it to false
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}
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return !mSortedBackwards;
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}
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// a new column was clicked, just return current sort direction
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return mSortedBackwards;
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} // CycleSortDirection
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