kmail/kcursorsaver.h

   1 #ifndef kcursorsaver_h
   2 #define kcursorsaver_h
   3
   4 #include <QCursor>
   5 #include <QApplication>
   6
   7 /**
   8  * @short sets a cursor and makes sure it's restored on destruction
   9  * Create a KCursorSaver object when you want to set the cursor.
  10  * As soon as it gets out of scope, it will restore the original
  11  * cursor.
  12  */
  13 class KCursorSaver
  14 {
  15 public:
  16     /// constructor taking QCursor shapes
  17     KCursorSaver(Qt::CursorShape shape) {
  18         QApplication::setOverrideCursor( QCursor(shape) );
  19         inited = true;
  20     }
  21
  22     /// copy constructor. The right side won't restore the cursor
  23     KCursorSaver( const KCursorSaver &rhs ) {
  24         *this = rhs;
  25     }
  26
  27     /// restore the cursor
  28     ~KCursorSaver() {
  29         if (inited)
  30             QApplication::restoreOverrideCursor();
  31     }
  32
  33     /// call this to explitly restore the cursor
  34     inline void restoreCursor(void) {
  35         QApplication::restoreOverrideCursor();
  36         inited = false;
  37     }
  38
  39 protected:
  40     void operator=( const KCursorSaver &rhs ) {
  41         inited = rhs.inited;
  42         rhs.inited = false;
  43     }
  44
  45 private:
  46     mutable bool inited;
  47 };
  48
  49 /**
  50  * convenience functions
  51  */
  52 namespace KBusyPtr {
  53     inline KCursorSaver idle() {
  54         return KCursorSaver(Qt::ArrowCursor);
  55     }
  56     inline KCursorSaver busy() {
  57         return KCursorSaver(Qt::WaitCursor);
  58     }
  59 }
  60
  61 #endif /*kbusyptr_h_*/