Class for mapping input widgets

[Hostel]

I'm making a widget for mapping a QRecord to input widgets. I want to that this new class will be similar in use with QDataWidgetMapper. I create a method

addMapping( QWidget* _widget, int _field );

addMapping( QWidget* _widget, int _field );

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In this method I want to set a value from record to input control(_widget). How can I do this in right way? My only thing is to make in method a series of dynamic_cast's to discover what a input widget is under _widget pointer. The same issue I have with reading values from input widgets to record - there again I need to know of type widget because I need read value. How to resolve this situation in elegant way?

[ChrisW67]

I believe that QDataWidgetMapper uses the Qt property system and reads/writes the USER property for most widgets. Have a look at the source.

[wysota]

To be more exact it uses a QAbstractItemDelegate and its setModelData() and setEditorData() calls that do what Chris said (manipulate the USER property).