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android13/external/pdfium/xfa/fwl/theme/README.md

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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.