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xfa/fwl is a Widget Library for XFA Forms.
CFWL_Widget is the base class that widget classes extend. The derived widget
classes are both controllers and renderers for each widget. The hierarchy is:
* CFWL_Widget
* CFWL_Form
* CFWL_Caret
* CFWL_CheckBox
* CFWL_ComboBox
* CFWL_DateTimePicker
* CFWL_Edit
* CFWL_Barcode
* CFWL_ComboEdit
* CFWL_DateTimeEdit
* CFWL_ListBox
* CFWL_ComboList
* CFWL_MonthCalendar
* CFWL_PictureBox
* CFWL_PushButton
* CFWL_ScrollBar
* CFWL_SpinButton
These CFWL widgets are instantiated by and closely related to the CXFA classes
in the xfa/fxfa directory. See xfa/fxfa/README.md.
CFWL_Widget implements IFWL_WidgetDelegate through which it receives messages,
events and draw calls.
Messages consist of user input for a widget to handle. Each type of message is
identified by an enum value in Message::Type and has its own class derived from
the base CFWL_Message.
* CFWL_Message
* CFWL_MessageKey
* CFWL_MessageKillFocus
* CFWL_MessageMouse
* CFWL_MessageMouseWheel
* CFWL_MessageSetFocus
Events are originated in the widgets and are then handled by other CFWL_Widget
and CXFA classes.
* CFWL_Event
* CFWL_EventCheckWord
* CFWL_EventMouse
* CFWL_EventScroll
* CFWL_EventSelectChanged
* CFWL_EventTextWillChange
* CFWL_EventValidate
The widgets use IFWL_ThemeProvider for rendering everything, calling
DrawBackground() and DrawText() and passing many options in their parameters,
respectively of types CFWL_ThemeBackground and CFWL_ThemeText. See
xfa/fwl/theme/README.md.
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