toollist.cpp

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// $Id: toollist.cpp 1361 2006-06-25 16:43:38Z 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.

You should have received a copy of the GNU General Public License along
with Xara LX (see the file GPL in the root directory of the
distribution); if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA  02110-1301 USA


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-----------------

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License described above, Xara Group Ltd grants to you certain additional
rights. 

The additional rights are to use, modify, and distribute the software
together with the wxWidgets library, the wxXtra library, and the "CDraw"
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----------------

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=================================XARAHEADEREND============================
 */

/*
*/

#include "camtypes.h"

#include "toollist.h"
//#include "oiltool.h"
//#include "ensure.h" - in camtypes.h [AUTOMATICALLY REMOVED]

DECLARE_SOURCE("$Revision: 1361 $");

CC_IMPLEMENT_MEMDUMP(ToolListItem, ListItem);
// Declare smart memory handling in Debug builds
#define new CAM_DEBUG_NEW

/********************************************************************************************

>   ToolListItem(Tool *NewTool, UINT32 ParentID)

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/6/93
    Inputs:     NewTool - Pointer to the tool to fill in the list item with.
                ParentID - Module ID of the module that provides this tool.
    Purpose:    Create a new ToolListItem with the tool pointer and info fields
                filled in.  The info fields are filled in by interrogating the tool.
                A new OILTool object is created for this tool, and linked in to the
                list item.
                The tool is linked to the ToolListItem via the Parent member variable, as
                this means it is easy to get hold of the tool's info (ToolInfo object)
                given a pointer to a tool (otherwise you have to do GetID() and call
                Tool::Find() to get the Tool info, which is a bit daft).

********************************************************************************************/

ToolListItem::ToolListItem(Tool *NewTool, UINT32 ParentID)
{
    m_fInitialised = FALSE;
    NewTool->Describe( &m_ToolInfo );
    m_ToolInfo.ParentModuleID = ParentID;
    m_pTool = NewTool;
    NewTool->Parent = this;
}

/********************************************************************************************

>   ToolListItem::~ToolListItem()

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    6/7/93
    Purpose:    Destructor.  Deletes the associated Tool and OILTool objects.
    Errors:     Asserts if the Tool object is not valid (i.e. NULL)

********************************************************************************************/

ToolListItem::~ToolListItem()
{
    // m_pTool may be NULL if the tool didn't initialise properly, because the Add() function 
    // will 'de-install' the tool from this list item to stop it being deleted
    // prematurely.
    delete m_pTool;

    // m_pOILTool may be NULL if the 'new' failed so don't assert (and our 
    // SimpleCCObject::delete can handle 'delete NULL;').
//  delete m_pOILTool;
}


CC_IMPLEMENT_MEMDUMP(ToolList, List);

/********************************************************************************************

>   ToolList::~ToolList()

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    7/7/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Destroys a ToolList object.  Deletes the Tool and OILTool objects contained
                in the list items, and deletes the list items themselves.
    Errors:     -
    SeeAlso:    ~ToolListItem

********************************************************************************************/

ToolList::~ToolList()
{
    // Call destructors on all objects in the list
    
    ToolListItem *Item = (ToolListItem *) RemoveHead();
    
    while (Item != NULL)
    {
        // Delete the list item
        delete Item;
        
        // Try the next item
        Item = (ToolListItem *) RemoveHead();
    }
}


/********************************************************************************************

>   ToolListItem *ToolList::Add(Tool *NewTool, UINT32 ParentID)

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/6/93
    Inputs:     NewTool - pointer to the tool to add into the list.
                ParentID - Module ID of the module that provides this tool.
    Outputs:    -
    Returns:    Pointer to the new item in the list if the tool was successfully added,
                NULL otherwise.
    Purpose:    Safe addition of tools to the kernel's list of known tools.  A tool
                will only be added if its ID has not already been used.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

ToolListItem *ToolList::Add(Tool *NewTool, UINT32 ParentID)
{
    // Construct a tentative list item
    ToolListItem *NewItem = new ToolListItem(NewTool, ParentID);
    if (NewItem == NULL)
        goto AbnormalExit;
    
    // Create a new OIL tool for this node
//  NewItem->m_pOILTool = new OILTool(ParentID);
//  if (NewItem->m_pOILTool == NULL)
//      goto AbnormalExit;
    
    // Interrogate tool about itself.
/*  if (NewItem->ToolInfo.ID == TOOLID_INVALID)
        goto AbnormalExit;
    
    
    // Search list to make sure this ID is not already in use.
    // (If I use one line initialisation the compiler complains that the gotos avoid it.)
    ToolListItem *Item;
    Item = (ToolListItem *) GetHead();
    
    while (Item != NULL)
    {
        if (Item->ToolInfo.ID == NewItem->ToolInfo.ID)
            // Found ID already in use - discard new list item and abort.
            goto AbnormalExit;
        
        // Try the next node in the list.
        Item = (ToolListItem *) GetNext(Item);
    }
*/  
    // The ID is not already in use so add the tool to the list.
    AddTail(NewItem);
    return NewItem;
    
    // Abnormal exit - clean up and return a NULL pointer to indicate it didn't work.
AbnormalExit:
    // Set Tool pointer to NULL to avoid it being deleted by the ToolListItem's destructor, because
    // the caller is not expecting this tool to be deleted from under its feet.
    NewItem->m_pTool = NULL;

    // Delete the ToolListItem
    delete NewItem;

    return NULL;
}

---