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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.
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