// $Id: overlist.h 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ // Merge list item #ifndef OVERRIDELIST #define OVERRIDELIST //#include "list.h" - in camtypes.h [AUTOMATICALLY REMOVED] #include "overitem.h" //OverrideListItem /*********************************************************************************************** > class OverrideList Author: Graham_Walmsley (Xara Group Ltd) Created: 21/4/97 Purpose: An override list contains items that can override each other. For example, imagine we are building a list of clickable areas in an imagemap. Our list of clickable areas already contains a rectangle with bottom left corner (0,0) and top right corner (200, 200), that links to the URL "http://www.xara.com". Now we add another clickable rectangle to the imagemap. This rectangle has bottom left corner (50,50) and top right corner (100,100) and also links to "http://www.xara.com". But our first rectangle is contained within our second rectangle! There is no need for the second rectangle at all. It is clear that the first rectangle overrides the second, so the second rectangle should not be added to the list. Now imagine the small rectangle is already in the list and the large rectangle is added. Again, the large rectangle overrides the small one. So the large rectangle should be added to the list and the smaller rectangle should be deleted. So, this class works as follows. When an OverrideListItem is added to this list, this function compares the item with every other item in the list. It does this by calling either the function OverrideListItem::OverrideFromAbove (if the item in the list is before the item being added) or OverrideListItem::OverrideFromBelow(if the item in the list is below the item being added). Then: a. If an item in the list overrides the item being added, then the new item is not added to the list. b. If the item being added overrides an item in the list, then the new item is added and the item in the list is deleted. ***********************************************************************************************/ class OverrideList : public List { CC_DECLARE_DYNAMIC( OverrideList ) //Constructor public: OverrideList(); //Overridden functions public: virtual void AddHead( OverrideListItem* ); virtual void AddTail( OverrideListItem* ); virtual LISTPOS InsertBefore(LISTPOS here, OverrideListItem* item); virtual ListItem *InsertBefore(OverrideListItem* here, OverrideListItem* item); virtual LISTPOS InsertAfter(LISTPOS here, OverrideListItem* item); virtual ListItem *InsertAfter(OverrideListItem* here, OverrideListItem* item); //Toolkit functions protected: virtual BOOL CompareWithItemsAbove(OverrideListItem* pliStartPos, OverrideListItem* pliToInsert); virtual BOOL CompareWithItemsBelow(OverrideListItem* pliStartPos, OverrideListItem* pliToInsert); }; #endif // OVERRIDELIST