I would say that the find button should take into consideration ALL of the data filled in on the form.

In any case, the form could provide a slot that gives the search data, e.g. a map of field name to string data QMap<QString, QString>.

Qt Code: 
  1. // form with line edits cpp
  2. void lineeditform::slotGiveSearchData(QMap<QString, QString>& data)
  3. {
  4.   // grab data from ui and put in map
  5. }
  6.  
  7. //results.hpp - your widget with find button and search results
  8. class results : QWidget
  9. {
  10.   Q_OBJECT
  11.  ...
  12.  
  13. private slots:
  14.  void slotFind();
  15.  
  16. signals:
  17.   signalGetSearchData();
  18. };
  19.  
  20. // results form cpp
  21. results::results(...)
  22. {
  23.   // connect find button clicked() to slotFind() slot
  24.   // connect signalGetSearchData to slotGiveSearchData on lineedit form
  25. }
  26.  
  27. void results::slotFind()
  28. {
  29.   QMap<QString, QString> searchData;
  30.   // use signal signalGetSearchData
  31.   emit signalGetSearchData(searchData);
  32.  
  33.   // we now have the data.
  34.  
  35.   // Do your search...
  36. }
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