keyboard_event.h

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#pragma once
 
#include <string>
 
namespace pcl
{
  namespace visualization
  {
    /** /brief Class representing key hit/release events */
    class KeyboardEvent
    {
      public:
        /** \brief bit pattern for the ALT key*/
        static const unsigned int Alt   = 1;
        /** \brief bit pattern for the Control key*/
        static const unsigned int Ctrl  = 2;
        /** \brief bit pattern for the Shift key*/
        static const unsigned int Shift = 4;
 
        /** \brief Constructor
          * \param[in] action    true for key was pressed, false for released
          * \param[in] key_sym   the key-name that caused the action
          * \param[in] key       the key code that caused the action
          * \param[in] alt       whether the alt key was pressed at the time where this event was triggered
          * \param[in] ctrl      whether the ctrl was pressed at the time where this event was triggered
          * \param[in] shift     whether the shift was pressed at the time where this event was triggered
          */
        inline KeyboardEvent (bool action, const std::string& key_sym, unsigned char key, 
                              bool alt, bool ctrl, bool shift);
 
        /**
          * \return   whether the alt key was pressed at the time where this event was triggered
          */
        inline bool 
        isAltPressed () const;
        
        /**
          * \return whether the ctrl was pressed at the time where this event was triggered
          */
        inline bool 
        isCtrlPressed () const;
        
        /**
          * \return whether the shift was pressed at the time where this event was triggered
          */
        inline bool 
        isShiftPressed () const;
 
        /**
          * \return the ASCII Code of the key that caused the event. If 0, then it was a special key, like ALT, F1, F2,... PgUp etc. Then the name of the key is in the keysym field.
          */
        inline unsigned char 
        getKeyCode () const;
        
        /**
          * \return name of the key that caused the event
          */
        inline const std::string& 
        getKeySym () const;
        
        /**
          * \return true if a key-press caused the event, false otherwise
          */
        inline bool 
        keyDown () const;
        
        /**
          * \return true if a key-release caused the event, false otherwise
          */
        inline bool 
        keyUp () const;
 
      protected:
 
        bool action_;
        unsigned int modifiers_{0};
        unsigned char key_code_;
        std::string key_sym_;
    };
 
    KeyboardEvent::KeyboardEvent (bool action, const std::string& key_sym, unsigned char key, 
                                  bool alt, bool ctrl, bool shift)
      : action_ (action)
      , 
       key_code_(key)
      , key_sym_ (key_sym)
    {
      if (alt)
        modifiers_ = Alt;
 
      if (ctrl)
        modifiers_ |= Ctrl;
 
      if (shift)
        modifiers_ |= Shift;
    }
 
    bool 
    KeyboardEvent::isAltPressed () const
    {
      return (modifiers_ & Alt) != 0;
    }
 
    bool 
    KeyboardEvent::isCtrlPressed () const
    {
      return (modifiers_ & Ctrl) != 0;
    }
 
    bool 
    KeyboardEvent::isShiftPressed () const
    {
      return (modifiers_ & Shift) != 0;
    }
 
    unsigned char 
    KeyboardEvent::getKeyCode () const
    {
      return (key_code_);
    }
 
    const std::string& 
    KeyboardEvent::getKeySym () const
    {
      return (key_sym_);
    }
 
    bool 
    KeyboardEvent::keyDown () const
    {
      return (action_);
    }
 
    bool 
    KeyboardEvent::keyUp () const
    {
      return (!action_);
    }  
  } // namespace visualization
} // namespace pcl