// $Id: overlist.cpp 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============================ */ // Imagemap class #include "camtypes.h" #include "overlist.h" //#include "list.h" - in camtypes.h [AUTOMATICALLY REMOVED] CC_IMPLEMENT_DYNAMIC(OverrideList, List) /******************************************************************************************** OverrideList::OverrideList() Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Purpose: Default constructor ********************************************************************************************/ OverrideList::OverrideList() : List() { } /******************************************************************************************** virtual void OverrideList::AddHead( OverrideListItem* poliToAdd) Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: poliToAdd The item to add Returns: - Purpose: Compares this list item with all the items in the list, to find out whether they override this list item or whether this list item overrides them. If this list item overrides any items already present in the list, the items in the list are deleted and this list item is added. If any item in the list overrides this list item, this list item is not added to the list. This function simply calls the InsertBefore function. SeeAlso: OverrideList::InsertBefore() ********************************************************************************************/ void OverrideList::AddHead( OverrideListItem* poliToAdd) { if (poliToAdd==NULL) { ERROR2RAW("OverrideList::AddHead - NULL parameter"); return; } //Get the first item in the list OverrideListItem* pliFirst=(OverrideListItem*) GetHead(); //Was there anything in the list? if (pliFirst!=NULL) { //Yes. So call our InsertBefore function InsertBefore(pliFirst, poliToAdd); } else { //No. So we need do no special checking - simply insert //the list item List::AddHead(poliToAdd); } } /******************************************************************************************** virtual void OverrideList::AddTail( OverrideListItem* poliToAdd) Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: poliToAdd The item to add Returns: - Purpose: Compares this list item with all the items in the list, to find out whether they override this list item or whether this list item overrides them. If this list item overrides any items already present in the list, the items in the list are deleted and this list item is added. If any item in the list overrides this list item, this list item is not added to the list. This function simply calls the InsertAfter function. SeeAlso: OverrideList::InsertAfter() ********************************************************************************************/ void OverrideList::AddTail( OverrideListItem* poliToAdd) { if (poliToAdd==NULL) { ERROR2RAW("OverrideList::AddTail - NULL parameter"); return; } //Get the last item in the list OverrideListItem* pliLast=(OverrideListItem*) GetTail(); //Was there anything in the list? if (pliLast!=NULL) { //Yes. So call our InsertAfter function InsertAfter(pliLast, poliToAdd); } else { //No. So we need do no special checking - simply insert //the list item List::AddTail(poliToAdd); } //And add our item after it InsertAfter(pliLast, poliToAdd); } /******************************************************************************************** virtual ListItem* OverrideList::InsertBefore(OverrideListItem* here, OverrideListItem* item); Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: poliToAdd The item to add Returns: - Purpose: Compares this list item with all the items in the list, to find out whether they override this list item or whether this list item overrides them. It does this by calling the function OverrideListItem::OverrideFromBelow on all items below the insertion position, and MergeListItem::OverrideFromAbove on all items above the insertion position. If this list item overrides any items already present in the list, the items in the list are deleted and this list item is added. If any item in the list overrides this list item, this list item is not added to the list. This function simply calls the InsertBefore function. SeeAlso: OverrideList::InsertBefore() ********************************************************************************************/ ListItem* OverrideList::InsertBefore(OverrideListItem* pliInsertPoint, OverrideListItem* pliToInsert) { ERROR2IF(pliToInsert==NULL, NULL, "OverrideList::InsertBefore - NULL parameter"); //This variable will tell us whether to insert pliToInsert //into the list BOOL fInsert=TRUE; //First compare pliToInsert with everything below pliInsertPoint in the list fInsert=CompareWithItemsBelow(pliInsertPoint, pliToInsert); //Now get the list item above pliInsertPoint OverrideListItem* pliTest=(OverrideListItem*) GetPrev(pliInsertPoint); //If there is anything above pliInsertPoint if (fInsert && pliTest!=NULL) { //Then test everything above pliInsertPoint fInsert=CompareWithItemsAbove(pliInsertPoint, pliToInsert); } //So, should we insert pliToInsert? if (fInsert) //Yes. So do it. return List::InsertBefore(pliInsertPoint, pliToInsert); else //No. So return an error value. return NULL; } /******************************************************************************************** virtual ListItem* OverrideList::InsertBefore(OverrideListItem* here, OverrideListItem* item); Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: poliToAdd The item to add Returns: - Purpose: Compares this list item with all the items in the list, to find out whether they override this list item or whether this list item overrides them. This function simply calls the other InsertBefore override. SeeAlso: OverrideList::InsertBefore() ********************************************************************************************/ LISTPOS OverrideList::InsertBefore(LISTPOS here, OverrideListItem* item) { ERROR2IF(item==NULL, NULL, "OverrideList::InsertBefore - NULL parameter"); //First find the list item at the position we have been given OverrideListItem* pliInsertionPoint=(OverrideListItem*) FindItem(here); //If we have not found it, return -1 if (pliInsertionPoint==NULL) return -1; //Otherwise, call our other function to do the insertion OverrideListItem* pliResult=(OverrideListItem*) InsertBefore(pliInsertionPoint, item); //If we have been returned NULL, then return an error value if (pliResult==NULL) return -1; //Otherwise, find our newly returned list item in the list //and return it return FindPosition(pliResult); } /******************************************************************************************** virtual ListItem* OverrideList::InsertAfter(OverrideListItem* here, OverrideListItem* item); Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: poliToAdd The item to add Returns: - Purpose: Compares this list item with all the items in the list, to find out whether they override this list item or whether this list item overrides them. It does this by calling the function MergeListItem::OverrideFromBelow on all items below the insertion position, and MergeListItem::OverrideFromAbove on all items above the insertion position. If this list item overrides any items already present in the list, the items in the list are deleted and this list item is added. If any item in the list overrides this list item, this list item is not added to the list. This function simply calls the InsertBefore function. SeeAlso: OverrideList::InsertBefore() ********************************************************************************************/ ListItem* OverrideList::InsertAfter(OverrideListItem* pliInsertPoint, OverrideListItem* pliToInsert) { ERROR2IF(pliToInsert==NULL, NULL, "OverrideList::InsertAfter - NULL parameter"); //This variable will tell us whether to insert pliToInsert //into the list BOOL fInsert=TRUE; //First compare pliToInsert with everything above pliInsertPoint in the list fInsert=CompareWithItemsAbove(pliInsertPoint, pliToInsert); //Now get the list item after pliInsertPoint OverrideListItem* pliTest=(OverrideListItem*) GetNext(pliInsertPoint); //If there is anything before pliInsertPoint if (fInsert && pliTest!=NULL) { //Then test everything before pliInsertPoint fInsert=CompareWithItemsBelow(pliInsertPoint, pliToInsert); } //So, should we insert pliToInsert? if (fInsert) //Yes. So do it. return List::InsertAfter(pliInsertPoint, pliToInsert); else //No. So return an error value. return NULL; } /******************************************************************************************** virtual ListItem* OverrideList::InsertAfter(OverrideListItem* here, OverrideListItem* item); Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: poliToAdd The item to add Returns: - Purpose: Compares this list item with all the items in the list, to find out whether they override this list item or whether this list item overrides them. This function simply calls the other InsertAfter override. SeeAlso: OverrideList::InsertAfter() ********************************************************************************************/ LISTPOS OverrideList::InsertAfter(LISTPOS here, OverrideListItem* item) { ERROR2IF(item==NULL, 0, "OverrideList::InsertAfter - NULL parameter"); //First find the list item at the position we have been given OverrideListItem* pliInsertionPoint=(OverrideListItem*) FindItem(here); //If we have not found it, return -1 if (pliInsertionPoint==NULL) return -1; //Otherwise, call our other function to do the insertion OverrideListItem* pliResult=(OverrideListItem*) InsertAfter(pliInsertionPoint, item); //If we have been returned NULL, then return an error value if (pliResult==NULL) return -1; //Otherwise, find our newly returned list item in the list //and return it return FindPosition(pliResult); } /***************************************************** Toolkit functions ****************************************************/ /******************************************************************************************** virtual BOOL OverrideList::CompareWithItemsAbove(OverrideListItem* pliStartPos, OverrideListItem* pliToInsert); Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: pliStartPos The position to start searching from pliToAdd The list items to add Returns: FALSE if pliToAdd was overridden by another item in the list TRUE if pliToAdd was not overridden Note that, if pliToAdd overrides another item in the list, this does not affect the result returned. Purpose: Compares this list item with all the items above pliStartPos, inclusive. SeeAlso: OverrideList::InsertBefore(), OverrideList::After() ********************************************************************************************/ BOOL OverrideList::CompareWithItemsAbove(OverrideListItem* pliStartPos, OverrideListItem* pliToInsert) { //This pointer will show the item we are looking at OverrideListItem* pliLook=pliStartPos; //While we are still looking at a valid item while (pliLook!=NULL) { //This will be the next item we look at //It's important to do this now - because we may delete pliLook in a moment OverrideListItem* pliNext=(OverrideListItem*) GetPrev(pliLook); //Does the item we are looking at override the item //we are about to insert? if (pliLook->OverrideFromAbove(pliToInsert)) { //Yes. So return to say that we're not going to insert the //item return FALSE; } //Does the item we are about to insert override the item //we are looking at? if (pliToInsert->OverrideFromBelow(pliLook)) { //Yes. So delete the item we are looking at. RemoveItem(pliLook); delete pliLook; } //And move on to the next item pliLook=pliNext; } //ANd return to say that pliToInsert has not been overridden return TRUE; } /******************************************************************************************** virtual BOOL OverrideList::CompareWithItemsBelow(OverrideListItem* pliStartPos, OverrideListItem* pliToInsert) Author: Graham_Walmsley (Xara Group Ltd) Created: 22/4/97 Inputs: pliStartPos The position to start searching from pliToAdd The list items to add Returns: FALSE if pliToAdd was overridden by another item in the list TRUE if pliToAdd was not overridden Note that, if pliToAdd overrides another item in the list, this does not affect the result returned. Purpose: Compares this list item with all the items below pliStartPos, inclusive. SeeAlso: OverrideList::InsertBefore(), OverrideList::After() ********************************************************************************************/ BOOL OverrideList::CompareWithItemsBelow(OverrideListItem* pliStartPos, OverrideListItem* pliToInsert) { //This pointer will show the item we are looking at OverrideListItem* pliLook=pliStartPos; //While we are still looking at a valid item while (pliLook!=NULL) { //This will be the next item we look at //It's important to do this now - because we may delete pliLook in a moment OverrideListItem* pliNext=(OverrideListItem*) GetNext(pliLook); //Does the item we are looking at override the item //we are about to insert? if (pliLook->OverrideFromBelow(pliToInsert)) { //Yes. So return to say that we're not going to insert the //item return FALSE; } //Does the item we are about to insert override the item //we are looking at? if (pliToInsert->OverrideFromAbove(pliLook)) { //Yes. So delete the item we are looking at. RemoveItem(pliLook); delete pliLook; } //And move on to the next item pliLook=pliNext; } //And return to say that pliToInsert has not been overridden return TRUE; }