Short Description: Accounting WS Qt4 Port: (1) Transfer Items, (2) Crash Fix
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 6.1

(1) Bifurcated SupplyGfxItem class, to TransferGfxItem. The latter has
 virtually the same implementation, but is instantiated and managed by 
 client classes in the case of Transfer Supplies (as opposed to other 
 types of Supplies).

(2) General: In all of our QGraphicsItem subclasses, redefine the int type()
 method, to return a class-specific class ID defined in this new definition
 header file: QtUtils/RwGraphicsItemDefs.hpp.

(3) Cause of "clear workspace" crash likely to be fixed by changes in
 QtUtils/WorkspaceGfxScene.cpp ... deletions of high level QGraphicsItems 
 caused problem for iteration over automatically deleted child items.

----------------------
QtUtils/Make.package
QtUtils/QtUtils.pro
QtUtils/QtUtils.vcproj
----------------------

Added to build:
  RwGraphicsItemDefs.hpp
  TransferGfxItem.hpp 
  TransferGfxItem.cpp

--------------------------
QtUtils/AccountGfxItem.hpp
QtUtils/AccountGfxItem.cpp
--------------------------

Introduction of TransferGfxItem class:
 QMap<Supply*, SupplyGfxItem*> _supplyItemMap;
 QMap<Supply*, TransferGfxItem*> _transferItemMap;  <<< ADDED

 void addTransferItem (TransferGfxItem*);
 void removeTransferItem (TransferGfxItem*);

Addressing a "clear workspace" crash:
 void prepareForDeletion();  
 void childDestroyed(); // Qt Slot
 void accountGfxItemDeleted (const AccountGfxItem*); // Qt Signal

--------------------------
QtUtils/AcctRowGfxItem.hpp
QtUtils/AcctRowGfxItem.cpp
--------------------------

Addressing a "clear workspace" crash:
  void removeAccount (const Account*, bool deleteItemToo=true); // ADDED PARAM
  void removeAccountItem (const AccountGfxItem*); // NEW METHOD

  void accountGfxItemDeleted (const AccountGfxItem*);  // Qt slot
  void childDestroyed();                               // Qt slot

------------------------------
QtUtils/SimulationGfxScene.cpp
------------------------------

Provisions for TransferGfxItem (similar to SupplyGfxItem) added to methods:
  void SimulationGfxScene::reconfigureSupplyItems()
  QString SimulationGfxScene::toolTipString (QGraphicsSceneHelpEvent*)

---------------------------
QtUtils/SupplyGfxItem.cpp
QtUtils/TransferGfxItem.cpp
---------------------------

Addressing a "clear workspace" crash:
  Don't explicitly delete the _arrowHeadItem.  Instead, just drop the 
  pointer once SupplyGfxItem deletion has started.  Memory leaks of
  _arrowHeadItems was tested -- they are automatically deleted as needed.

-----------------------------
QtUtils/WorkspaceGfxScene.hpp
QtUtils/WorkspaceGfxScene.cpp
-----------------------------

Added methods to support TransferGfxItem (similar to SupplyGfxItem):
  QMap<Supply*, TransferGfxItem*> getTransferMap() const;
  TransferGfxItem* getTransferItem (const Supply*) const;

Provisions for TransferGfxItem (similar to SupplyGfxItem) added to methods:
  void WorkspaceGfxScene::addSupplyItem (Supply*)
  void WorkspaceGfxScene::deleteSupplyItem (Supply*)
  void WorkspaceGfxScene::setSupplyStyle (Supply*)
  void WorkspaceGfxScene::clearLinkAndSupplyItems()

Addressing a "clear workspace" crash:
  Widespread use of checking the QGraphicsItem::type() virtual method 
  value before doing any dynamic casting to our QGraphicsItem subclasses.

  *** THIS may be the specific fix to the "clear workspace" crashing:
  In methods: 
    void WorkspaceGfxScene::clearSimObjItems() ... 
    void WorkspaceGfxScene::clearLinkAndSupplyItems() ...

  ... Don't do any actual deletions WHILE iterating over the set of all 
  QGraphicsItems.  Probably, encountering pointers to certain child 
  QGraphicsItems which were deleted from the deletion of a previously 
  found SimObjGfxItem (or Supply or Transfer item) was causing a problem.

----------------------------
QtUtils/WorkspaceGfxView.cpp
----------------------------

Provisions for TransferGfxItem (similar to SupplyGfxItem) added to methods:
  QString WorkspaceGfxView::mouseStatusMessage (const QPoint& ..

----------------------------
QtUtils/ArrowHeadGfxItem.hpp
QtUtils/ArrowHeadGfxItem.cpp
QtUtils/LinkGfxItem.hpp
QtUtils/MarkPointGfxItem.hpp
QtUtils/RwGraphicsItem.hpp
QtUtils/SimObjGfxItem.hpp
QtUtils/SimpleSimObjGfxItem.hpp
QtUtils/SupplyGfxItem.hpp
QtUtils/TransferGfxItem.hpp
----------------------------

Minor: added QGraphicsItem int type() virtual method definition.
See new header file: QtUtils/RwGraphicsItemDefs.hpp.

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