unikonf/qtutils.h

   1 /** Some generally useful Qt utils. */
   2 #ifndef __QTUTILS_H
   3 #define __QTUTILS_H
   4
   5 #include <qobject.h>
   6 #include <qwidget.h>
   7
   8 /**
   9  * Watches for FocusIn and FocusOut events on a target widget.
  10  * To use this class, create an instance (may be shared),
  11  * connect to the signals, and attach the object to the widgets
  12  * to be observed using:
  13  *    widgetInstance->installEventFilter(focusObserverInstance);
  14  */
  15 class FocusObserver : public QObject
  16 {
  17     Q_OBJECT
  18
  19 public:
  20     FocusObserver() { }
  21     virtual ~FocusObserver() { }
  22
  23 signals:
  24     // called when target widget receives focus
  25     void focusIn(QWidget *widget);
  26
  27     // called when target widget loses focus
  28     void focusOut(QWidget *widget);
  29
  30 protected:
  31     virtual bool eventFilter(QObject *obj, QEvent *event);
  32 };
  33
  34 #endif // __QTUTILS_H