xfa/fwl/theme contains code for rendering XFA widgets.

TP stands for Theme Part.

CFWL_WidgetTP contains much of the code common to more than one widget.

The other CFWL_TP classes derive from it and know how to draw the pieces specific to their respective widget.

The inheritance hierarchy for this directory is:

• CFWL_WidgetTP
  • CFWL_BarcodeTP
  • CFWL_CaretTP
  • CFWL_CheckboxTP
  • CFWL_ComboBowTP
  • CFWL_DateTimePickerTP
  • CFWL_EditTP
  • CFWL_ListBoxTP
  • CFWL_MonthCalendarTP
  • CFWL_PictureBoxTP
  • CFWL_PushButtonTP
  • CFWL_ScrollBarTP

All these widget TP classes are composed into CXFA_FWLTheme, which implements IFWL_ThemeProvider (and is the only class that does). CXFA_FWLTheme receives DrawBackground() calls from CFWL widgets to draw themselves and routes them to the TP (Theme Part) corresponding to that widget.