events.h

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/*! \file
  \brief  The standard Mouse and keyboard events and event structures

  \par Copyright Information

  Copyright (c) 2015 by The DiSTI Corporation.<br />
  11301 Corporate Blvd., Suite 100<br />
  Orlando, FL 32817<br />
  USA<br />
  <br />
  All rights reserved.<br />

  This Software contains proprietary trade secrets of DiSTI and may not be
reproduced, in whole or part, in any form, or by any means of electronic,
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*/
#ifndef INCLUDED_DISTI_EVENTS_H
#define INCLUDED_DISTI_EVENTS_H

#include "component_base.h"
#include "display.h"
#include "gls_include.h"
#include "group.h"
#include "timer.h"
#include <string>

#ifdef __VXWORKS__
#    include <cctype> //tolower
#endif

namespace disti
{
/** Enumeration for event types */
typedef enum
{
    EVENT_MOUSE,      /**< A Mouse (or touch screen) event */
    EVENT_KEYBOARD,   /**< A Keyboard event */
    EVENT_TIMER,      /**< Unused */
    EVENT_OBJECT,     /**< An event emitted by an object */
    EVENT_KEYBOARD_UP /**< A Keyboard up event (uses KeyboardEvent class) */
} EventType_e;

/** Enumeration for mouse event types */
typedef enum
{
    MOUSE_DOWN,               /**< A Mouse button was pushed down */
    MOUSE_UP,                 /**< A Mouse button was released */
    MOUSE_MOVE,               /**< The mouse moved */
    MOUSE_DRAG,               /**< The mouse moved while a button was held down */
    MOUSE_LEAVE,              /**< The mouse exited the object */
    MOUSE_ENTER,              /**< The mouse entered the object */
    MOUSE_WHEEL_MINUS,        /**< The mouse wheel was turned in the negative direction */
    MOUSE_WHEEL_PLUS,         /**< The mouse wheel was turned in the positive direction */
    MOUSE_RECEIVE_MULTITOUCH, /**< Handle this event to receive input from multiple touches at the same time */
    MOUSE_CANCEL,             /**< Handle this event to interrupt the current mouse event */
    MOUSE_DOUBLE              /**< A Mouse button was pushed down twice */
} MouseEventType_e;

/** Enumeration for mouse buttons */
typedef enum
{
    MOUSE_LBUTTON    = 1, /**< Mask that matches only left mouse button */
    MOUSE_MBUTTON    = 2, /**< Mask that matches only middle mouse button */
    MOUSE_RBUTTON    = 4, /**< Mask that matches only right mouse button */
    MOUSE_BUTTON_ANY = 7  /**< Mask that matches any mouse button */
} MouseButtonType_e;

/** Enumeration for keyboard modifiers */
typedef enum
{
    NONE_STATE        = 0,
    SHIFT_STATE       = 0x00010000,
    CAPS_LOCK_STATE   = 0x00020000,
    CTRL_STATE        = 0x00040000,
    ALT_STATE         = 0x00080000,
    NUM_LOCK_STATE    = 0x00100000,
    META_STATE        = 0x00400000,
    SCROLL_LOCK_STATE = 0x00800000,
    BUTTON1_STATE     = 0x01000000,
    BUTTON2_STATE     = 0x02000000,
    BUTTON3_STATE     = 0x04000000
} SpecialKeyState_e;

/** The base class for all user defined events.
  * Each new class of event is assigned an event type.
  * Each new event is assigned an event subtype
  */
class DisplayEvent
{
public:
    unsigned short eventType;    /**< Major event code. e.g., EVENT_MOUSE */
    unsigned short eventSubtype; /**< Minor event code. e.g., MOUSE_DOWN */

    /** Default constructor */
    DisplayEvent()
        : eventType( 0u )
        , eventSubtype( 0u )
    {
    }

    /** Copy constructor */
    DisplayEvent( const DisplayEvent& source )
        : eventType( source.eventType )
        , eventSubtype( source.eventSubtype )
    {
    }

    /** Virtual deconstructor to enable RTTI */
    virtual ~DisplayEvent()
    {
    }
};

/** An event with location fields */
class LocationEvent : public DisplayEvent
{
public:
    /** Location of the event in window coordinates
      * x and y window coordinates in pixels.
      * z is from 0.0 -> 1.0 and represents the depth.
      * z == 0 is at the near cliping plane.
      * z == 0.5 represents half way between near
      * and far cliping planes.
      */
    Vector winLoc;

    /** x,y,z of event in logical design coordinates */
    Vector lCoords;

    /** x,y,z of event in object DCS coordinates */
    Vector oCoords;

    // These references are included for backwards compatibility with GL Studio 2.1.
    // They are simply references into the above vectors.  New code should not use these!
    float& x; /**< Reference to winLoc.x */
    float& y; /**< Reference to winLoc.y */
    float& z; /**< Reference to winLoc.z */

    float& lx; /**< Reference to lCoords.x */
    float& ly; /**< Reference to lCoords.y */
    float& lz; /**< Reference to lCoords.z */

    float& ox; /**< Reference to oCoords.x */
    float& oy; /**< Reference to oCoords.y */
    float& oz; /**< Reference to oCoords.z */

    /** Because of the use of the references, all automatically generated methods
      * must be defined to allow for copying. */

    /** Default constructor */
    LocationEvent()
        : DisplayEvent()
        , x( winLoc.x )
        , y( winLoc.y )
        , z( winLoc.z )
        , lx( lCoords.x )
        , ly( lCoords.y )
        , lz( lCoords.z )
        , ox( oCoords.x )
        , oy( oCoords.y )
        , oz( oCoords.z )
    {
    }

    /** Copy Constructor */
    LocationEvent( const LocationEvent& source )
        : DisplayEvent( source )
        , winLoc( source.winLoc )
        , lCoords( source.lCoords )
        , oCoords( source.oCoords )
        , x( winLoc.x )
        , y( winLoc.y )
        , z( winLoc.z )
        , lx( lCoords.x )
        , ly( lCoords.y )
        , lz( lCoords.z )
        , ox( oCoords.x )
        , oy( oCoords.y )
        , oz( oCoords.z )
    {
    }

    /** Assignment operator */
    LocationEvent operator=( const LocationEvent& source )
    {
        eventType    = source.eventType;
        eventSubtype = source.eventSubtype;
        winLoc       = source.winLoc;
        lCoords      = source.lCoords;
        oCoords      = source.oCoords;
        return *this;
    }
};

/** A mouse event */
class MouseEvent : public LocationEvent
{
public:
    /** Default Constructor */
    MouseEvent()
        : LocationEvent()
        , buttonMask( 0u )
        , clicks( 0u )
        , modifiers( 0 )
        , cursorID( 0u )
    {
        eventType = EVENT_MOUSE;
    }

    /** Copy Constructor */
    MouseEvent( const MouseEvent& source )
        : LocationEvent( source )
        , buttonMask( source.buttonMask )
        , clicks( source.clicks )
        , modifiers( source.modifiers )
        , cursorID( source.cursorID )
    {
    }

    /** Copy Constructor from LocationEvent */
    MouseEvent( const LocationEvent& source )
        : LocationEvent( source )
        , buttonMask( 0u )
        , clicks( 0u )
        , modifiers( 0 )
        , cursorID( 0u )
    {
        eventType = EVENT_MOUSE;
    }

    /** Assignment operator */
    MouseEvent operator=( const MouseEvent& source )
    {
        LocationEvent::operator=( source );
        buttonMask             = source.buttonMask;
        clicks                 = source.clicks;
        modifiers              = source.modifiers;
        cursorID               = source.cursorID;
        return *this;
    }

    unsigned char buttonMask; /**< bitfield: which button was pressed for this event */
    unsigned char clicks;     /**< Number of times a button was pressed */
    int           modifiers;  /**< bitfield: which buttons or modifiers were depressed before event \sa SpecialKeyState_e */
    unsigned int  cursorID;   /**< cursor id for multi-touch support */
};

/** A keyboard event */
class KeyboardEvent : public LocationEvent
{
public:
    /** Default Constructor */
    KeyboardEvent()
        : LocationEvent()
        , keysym( 0 )
        , event_text( 0 )
        , modifiers( 0 )
    {
    }

    /** Copy Constructor */
    KeyboardEvent( const KeyboardEvent& source )
        : LocationEvent( source )
        , keysym( source.keysym )
        , event_text( source.event_text )
        , modifiers( source.modifiers )
    {
    }

    /** Copy Constructor from LocationEvent*/
    KeyboardEvent( const LocationEvent& source )
        : LocationEvent( source )
        , keysym( 0 )
        , event_text( 0 )
        , modifiers( 0 )
    {
    }

    /** Assignment operator */
    KeyboardEvent operator=( const KeyboardEvent& source )
    {
        LocationEvent::operator=( source );
        keysym                 = source.keysym;
        event_text             = source.event_text;
        modifiers              = source.modifiers;
        return *this;
    }

    int keysym;     /**< FLTK code for key that was pressed */
    int event_text; /**< FLTK event text code for key that was pressed */
    int modifiers;  /**< bitfield: which modifiers or buttons were pressed \sa SpecialKeyState_e */
};

/** The ObjectEvent class
  * This event is intended to be emitted by objects, rather than by a mouse or keyboard.
  */
class ObjectEvent : public DisplayEvent
{
    DisplayObject* _initiator; /**< The display object that initiated the event */
    char*          _eventName; /**< String event name */
    char*          _eventData; /**< Any additional data for this event.  A NULL terminated string */

public:
    ObjectEvent()
        : DisplayEvent()
        , _initiator( NULL )
        , _eventName( NULL )
        , _eventData( NULL )
    {
        eventType = EVENT_OBJECT;
    }

    /** Create an ObjectEvent, setting the initator and event name
      * \param initiator  Pointer to the object that initated the event
      * \param eventName  Name of the event
      * \param eventData  Data of the event
      */
    ObjectEvent( DisplayObject* initiator, const char* eventName, const char* eventData = NULL )
        : DisplayEvent()
        , _initiator( initiator )
        , _eventName( NULL )
        , _eventData( NULL )
    {
        int size   = (int)strlen( eventName ) + 1;
        _eventName = new char[ size ];
#if defined( _WIN32 )
        strcpy_s( _eventName, size, eventName );
#else
        strcpy( _eventName, eventName );
#endif
        if( eventData )
        {
            size       = (int)strlen( eventData ) + 1;
            _eventData = new char[ size ];
#if defined( _WIN32 )
            strcpy_s( _eventData, size, eventData );
#else
            strcpy( _eventData, eventData );
#endif
        }

        eventType = EVENT_OBJECT;
    }

    /** Create an ObjectEvent, setting the initator and event subtype
      * \param initiator Pointer to the object that initated the event
      * \param eventSubtypeArg The arbitrary event subtype
      */
    ObjectEvent( DisplayObject* initiator, unsigned short eventSubtypeArg )
        : DisplayEvent()
        , _initiator( initiator )
        , _eventName( NULL )
        , _eventData( NULL )
    {
        eventType    = EVENT_OBJECT;
        eventSubtype = eventSubtypeArg;
    }

    virtual ~ObjectEvent()
    {
        delete[] _eventName;
        _eventName = NULL;

        delete[] _eventData;
        _eventData = NULL;
    }

    /** \return Pointer to the object that initiated the event (may be NULL)
      */
    DisplayObject* Initiator() const { return _initiator; }

    /** Set which object initiated the event
      * \param initiator  Pointer to the object that initiated the event
      */
    void Initiator( DisplayObject* initiator ) { _initiator = initiator; }

    /** \return The name of the event
      */
    const char* EventName() const
    {
        if( _eventName )
        {
            return _eventName;
        }
        else
        {
            return "";
        }
    }

    /** Set the name of the event
      * For CRT safety, this should only be called by the constructing code
      * \param newName  The name to set
      */
    void EventName( const char* newName )
    {
        delete[] _eventName;
        _eventName = NULL;

        if( newName )
        {
            int size   = (int)strlen( newName ) + 1;
            _eventName = new char[ size ];
#if defined( _WIN32 )
            strcpy_s( _eventName, size, newName );
#else
            strcpy( _eventName, newName );
#endif
        }
    }

    /** \return The data of the event, NULL terminated
      */
    const char* EventData() const
    {
        if( _eventData )
        {
            return _eventData;
        }
        else
        {
            return "";
        }
    }

    /** Set the data of the event, NULL terminated.
      * For CRT safety, this should only be called by the constructing code
      * \param newData The name to set
      */
    void EventData( const char* newData )
    {
        delete[] _eventData;
        _eventData = NULL;

        if( newData )
        {
            int size   = (int)strlen( newData ) + 1;
            _eventData = new char[ size ];
#if defined( _WIN32 )
            strcpy_s( _eventData, size, newData );
#else
            strcpy( _eventData, newData );
#endif
        }
    }

    /** return true if the name of this event matches the given name.
      * \param eventName  The name to compare
      */
    bool EventNameIs( const char* eventName ) const
    {
        if( !_eventName || !eventName )
        {
            return false;
        }

        return ( 0 == strcmp( _eventName, eventName ) );
    }

    /** return true if the name of this event matches the given name.
      * \param eventData  The name to compare
      */
    bool EventDataIs( const char* eventData ) const
    {
        if( !_eventData || !eventData )
        {
            return false;
        }

        return ( 0 == strcmp( _eventData, eventData ) );
    }
};

/** Emits the specfied ObjectEvent */
inline void EmitObjectEvent( DisplayObject* self, ObjectEvent* event )
{
    if( self->ParentGroup() )
    {
        self->ParentGroup()->handle( event );
    }
    else if( dynamic_cast<ComponentBase*>( self ) )
    {
        // Called when our ParentGroup is NULL and we are wrapped by an RSO Interface.
        self->handle( event );
    }
}

/** Creates an ObjectEvent from the given NULL terminated strings and emits it */
inline void EmitObjectEvent( DisplayObject* self, const char* eventName, const char* eventData = NULL )
{
    ObjectEvent temp( self, eventName, eventData );
    EmitObjectEvent( self, &temp );
}

/** \return true if the given DisplayEvent is an ObjectEvent and it's event name matches the given string.
  * \param event  The event to check
  * \param eventName  The eventName to compare
  * \param eventData optional eventData to compare, if NULL, it will not be checked, otherwise, it will.
  */
inline bool ObjectEventIs( DisplayEvent* event, const char* eventName, const char* eventData = NULL )
{
    ObjectEvent* objEvent = dynamic_cast<ObjectEvent*>( event );
    bool         is       = ( objEvent && objEvent->EventNameIs( eventName ) );
    if( is && eventData )
    {
        is = objEvent->EventDataIs( eventData );
    }
    return is;
}

/** Basic on event test, given the event and subevent enums. */
#define ON( event, subevent ) if( ( ev->eventType == ( event ) ) && ( ev->eventSubtype == ( subevent ) ) )

/** On mouse button up event test, given the mouse button enum. */
#define ON_MOUSE_UP( btnMask ) if( ( ev->eventType == EVENT_MOUSE ) && ( ev->eventSubtype == MOUSE_UP ) && ( (btnMask)&mev->buttonMask ) )

/** On mouse button down event test, given the mouse button enum. */
#define ON_MOUSE_DOWN( btnMask ) if( ( ev->eventType == EVENT_MOUSE ) && ( ev->eventSubtype == MOUSE_DOWN ) && ( (btnMask)&mev->buttonMask ) )

/** On mouse button held during a drag event test, given the mouse button enum. */
#define ON_MOUSE_DRAG( btnMask ) if( ( ev->eventType == EVENT_MOUSE ) && ( ev->eventSubtype == MOUSE_DRAG ) && ( (btnMask)&mev->buttonMask ) )

/** On keyboard key down event test, given the alpha numeric key to test. */
#define ON_KEY_DOWN( testKey ) if( ( ev->eventType == EVENT_KEYBOARD ) && OnKeyEvent( kev, true, int( testKey ) ) )

/** On keyboard key up event test, given the alpha numeric key to test. */
#define ON_KEY_UP( testKey ) if( ( ev->eventType == EVENT_KEYBOARD_UP ) && OnKeyEvent( kev, true, int( testKey ) ) )

/** On keyboard key down with modifiers event test, given the alpha numeric key and modifiers to test. */
#define ON_KEY_DOWN_WITH_MODIFIER( testKey, modifierMask ) if( ( ev->eventType == EVENT_KEYBOARD ) && OnKeyEvent( kev, true, int( testKey ), modifierMask ) )

/** On keyboard key up with modifiers event test, given the alpha numeric key and modifiers to test. */
#define ON_KEY_UP_WITH_MODIFIER( testKey, modifierMask ) if( ( ev->eventType == EVENT_KEYBOARD_UP ) && OnKeyEvent( kev, true, int( testKey ), modifierMask ) )

/** On keyboard key down event test, given the special key to test. */
#define ON_SPECIAL_KEY_DOWN( keySym ) if( ( ev->eventType == EVENT_KEYBOARD ) && OnKeyEvent( kev, false, int( keySym ) ) )

/** On keyboard key up event test, given the special key to test. */
#define ON_SPECIAL_KEY_UP( keySym ) if( ( ev->eventType == EVENT_KEYBOARD_UP ) && OnKeyEvent( kev, false, int( keySym ) ) )

/** On keyboard key down with modifiers event test, given the special key and modifiers to test. */
#define ON_SPECIAL_KEY_DOWN_WITH_MODIFIER( keySym, modifierMask ) if( ( ev->eventType == EVENT_KEYBOARD ) && OnKeyEvent( kev, false, int( keySym ), modifierMask ) )

/** On keyboard key up with modifiers event test, given the special key and modifiers to test. */
#define ON_SPECIAL_KEY_UP_WITH_MODIFIER( keySym, modifierMask ) if( ( ev->eventType == EVENT_KEYBOARD_UP ) && OnKeyEvent( kev, false, int( keySym ), modifierMask ) )

/** On keyboard key down event test. */
#define ON_ANY_KEY_DOWN() if( ( ev->eventType == EVENT_KEYBOARD ) )

/** On keyboard key up event test. */
#define ON_ANY_KEY_UP() if( ( ev->eventType == EVENT_KEYBOARD_UP ) )

/** Examples:
  *     ON( EVENT_MOUSE, MOUSE_DOWN )
  *     {
  *     }
  *     ON_MOUSE_DOWN( MOUSE_LBUTTON )
  *     {
  *     }
  *     ON_KEY_DOWN( 'a' )
  *     {
  *     }
  *     ON_KEY_DOWN_WITH_MODIFIER( 'B', FL_SHIFT )
  *     {
  *     }
  *     ON_KEY_DOWN_WITH_MODIFIER( 'c', FL_SHIFT | FL_CTRL )
  *     {
  *     }
  *     ON_SPECIAL_KEY_DOWN( FL_KP+'1' )
  *     {
  *     }
  *     ON_SPECIAL_KEY_DOWN_WITH_MODIFIER( FL_F+1, FL_CTRL )
  *     {
  *     }
  *     For a comprehensive list of keys and modifiers refer to Enumerations.H.
  */

inline bool OnKeyEvent( KeyboardEvent* kev, bool alphaNumeric, int key, int modifierMask = 0 )
{
    bool keySuccess = false;

    if( alphaNumeric )
    {
        /** If CTRL is expected we need to look at keysym instead.
          * Because CTRL changes the output of the key press to something unexpected
          * we need to check against the key press action instead. 
          */
        if( CTRL_STATE & modifierMask )
        {
            /** keysym is always lowercase */
            key        = std::tolower( key );
            keySuccess = ( key == kev->keysym );
        }
        else
        {
            keySuccess = ( key == kev->event_text );
        }
    }
    else
    {
        keySuccess = ( key == kev->keysym );
    }

    /** Compare to zero to avoid performance warnings. 
      * Did we find the modifiers we're looking for (modifierMask) in the modifiers currently pressed (kev->modifiers)?
      * OR Are we not looking for any modifiers AND none of the modifiers are currently pressed?
      * (ignoring the lock state and mouse button modifiers)
      */
    bool modSuccess = ( 0 != ( modifierMask & kev->modifiers ) || ( 0 == modifierMask && 0 == ( int( SHIFT_STATE | CTRL_STATE | ALT_STATE | META_STATE ) & kev->modifiers ) ) );

    return ( keySuccess && modSuccess );
}

template<class T>
/** Event Compressor */
class EventCompressor
{
public:
    typedef DisplayObject* ( T::*EventSenderCbType )( DisplayEvent* ev );

protected:
    MouseEvent        _lastCompressedEvent;
    bool              _lastEventWasCompressed;
    EventSenderCbType _handleCb;
    T*                _objectPtr;
    bool              _sendingCompressed;
    bool              _active;

public:
    void Active( bool val ) { _active = val; }
    bool Active() { return _active; }

    EventCompressor( T* objectPtr, EventSenderCbType cb )
        : _lastEventWasCompressed( false )
        , _handleCb( cb )
        , _objectPtr( objectPtr )
        , _sendingCompressed( false )
        , _active( true )
    {
    }

    /** Returns true if event was compressed.
      * Caller should stop processing this event if returns true
      * Caller *MUST* call SendAnyCompressedEvents() before
      * drawing to make sure any saved events are processed.
      */
    bool CompressEvent( const DisplayEvent& ev )
    {
        if( !_active || _sendingCompressed )
        {
            return false;
        }

        bool compressed = false;
        if( EVENT_MOUSE == ev.eventType && ( MOUSE_MOVE == ev.eventSubtype || MOUSE_DRAG == ev.eventSubtype ) )
        {
            MouseEvent* mev = (MouseEvent*)&ev;

            if( !_lastEventWasCompressed || ( _lastEventWasCompressed && _lastCompressedEvent.eventType == ev.eventType && _lastCompressedEvent.eventSubtype == ev.eventSubtype && _lastCompressedEvent.cursorID == mev->cursorID ) )
            {
                // Replace with this event, and don't send
                _lastCompressedEvent    = *mev;
                _lastEventWasCompressed = true;
                compressed              = true;
            }
        }

        // If we did not compress the event, send any pending ones.
        if( !compressed )
        {
            SendAnyCompressedEvents();
        }
        return compressed;
    }

    void SendAnyCompressedEvents()
    {
        // Avoids infinite loop
        if( _sendingCompressed )
        {
            return;
        }

        if( _lastEventWasCompressed )
        {
            _sendingCompressed = true;
            // Call the callback
            ( _objectPtr->*( _handleCb ) )( &_lastCompressedEvent );
            // The event is no longer valid
            _sendingCompressed = false;

            _lastEventWasCompressed = false;
        }
    }
};

} // namespace disti

#endif // INCLUDED_DISTI_EVENTS_H