4-21-2011

Short Description: Qt4 Port: RPL Display Dialog, "Line Breaks" Q3ListView
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 6.1

----------------------------
RplDisplaySettingsDlg.hpp
RplDisplaySettingsDlg.cpp
RplDisplaySettingsWidgets.ui
----------------------------

  OLD: Q3ListView*  _ui._breaksListView
  NEW: QTreeWidget* _ui._breaksTreeView

  OLD: class RplDisplaySettingsDlg::LineBreakViewItem : public Q3ListViewItem
  NEW: class RplDisplaySettingsDlg::LineBreakItem : public QTreeWidgetItem

This was a port to a (simple, item-based) QTreeWidget. The following 
features needed to be addressed in this port:

  (1) Three columns with in-cell numeric editing, with one having displayed
    text for two special values ("Always" and "Never").
  (2) Two columns with icon-implemented checkboxes, manually implemented
    with mouse clicks.
  (3) Sortable columns
  (4) Centered column content. Special indented Red-X and Green-Check icons
    are dynamically constructed to implement those icons as centered.
  
Additionally, the following behaviors were explicitly implemented:

  (1) Deferred (timer-based) scrolling to the CURRENT ITEM after operations
    (including incell-edits) which effect the list order (based on the 
    current sort column).
  (2) Infinite recursion prevention on change notifications. (QTreeWidget
    doesn't provide a way of distinguishing use edits from programatic
    changes).
  (3) Custom item comparison operator to implement numeric and check-icon 
    column sorting.
  
---