/********************************************************************************
*                                                                               *
*                              D a t a   T a r g e t                            *
*                                                                               *
*********************************************************************************
* Copyright (C) 1998,2001 by Jeroen van der Zijp.   All Rights Reserved.        *
*********************************************************************************
* This library is free software; you can redistribute it and/or                 *
* modify it under the terms of the GNU Lesser General Public                    *
* License as published by the Free Software Foundation; either                  *
* version 2.1 of the License, or (at your option) any later version.            *
*                                                                               *
* This library is distributed in the hope that it will be useful,               *
* but WITHOUT ANY WARRANTY; without even the implied warranty of                *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU             *
* Lesser General Public License for more details.                               *
*                                                                               *
* You should have received a copy of the GNU Lesser General Public              *
* License along with this library; if not, write to the Free Software           *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.    *
*********************************************************************************
* $Id: FXDataTarget.h,v 1.12 2001/06/27 15:20:33 jeroen Exp $                   *
********************************************************************************/
#ifndef FXDATATARGET_H
#define FXDATATARGET_H


/**
* A Data Target allows a valuator widget such as a Slider or Text Field
* to be directly connected with a variable in the program. 
* Whenever the valuator control changes, the variable connected through
* the data target is automatically updated; conversely, whenever the program
* changes a variable, all the connected valuator widgets will be updated 
* to reflect this new value on the display.
* Data Targets also allow connecting Radio Buttons, Menu Commands, and so on
* to a variable.  In this case, the new value of the connected variable is computed 
* by substracting ID_OPTION from the message ID.
*/
class FXAPI FXDataTarget : public FXObject {
  FXDECLARE(FXDataTarget)
protected:
  FXObject     *target;                 // Target object
  void         *data;                   // Associated data
  FXSelector    message;                // Message ID
  FXuint        type;                   // Type of data
public:
  long onCmdValue(FXObject*,FXSelector,void*);
  long onUpdValue(FXObject*,FXSelector,void*);
  long onCmdOption(FXObject*,FXSelector,void*);
  long onUpdOption(FXObject*,FXSelector,void*);
public:
  enum {
    DT_VOID=0,
    DT_CHAR,
    DT_UCHAR,
    DT_SHORT,
    DT_USHORT,
    DT_INT,
    DT_UINT,
    DT_FLOAT,
    DT_DOUBLE,
    DT_STRING,
    DT_LAST
    };
public:
  enum {
    ID_VALUE=1,                   /// Will cause the FXDataTarget to ask sender for value
    ID_OPTION=ID_VALUE+10001,     /// ID_OPTION+i will set the value to i where -10000<=i<=10000
    ID_LAST=ID_OPTION+10000
    };
public:

  /// Associate with nothing
  FXDataTarget(FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(NULL),message(sel),type(DT_VOID){}

  /// Associate with character variable
  FXDataTarget(FXchar& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_CHAR){}

  /// Associate with unsigned character variable
  FXDataTarget(FXuchar& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_UCHAR){}

  /// Associate with signed short variable
  FXDataTarget(FXshort& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_SHORT){}

  /// Associate with unsigned short variable
  FXDataTarget(FXushort& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_USHORT){}

  /// Associate with int variable
  FXDataTarget(FXint& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_INT){}

  /// Associate with unsigned int variable
  FXDataTarget(FXuint& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_UINT){}

  /// Associate with float variable
  FXDataTarget(FXfloat& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_FLOAT){}

  /// Associate with double variable
  FXDataTarget(FXdouble& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_DOUBLE){}

  /// Associate with string variable
  FXDataTarget(FXString& value,FXObject* tgt=NULL,FXSelector sel=0):target(tgt),data(&value),message(sel),type(DT_STRING){}


  /// Set the message target object for this data target
  void setTarget(FXObject *t){ target=t; }

  /// Get the message target object for this data target, if any
  FXObject* getTarget() const { return target; }

  /// Set the message identifier for this data target
  void setSelector(FXSelector sel){ message=sel; }

  /// Get the message identifier for this data target
  FXSelector getSelector() const { return message; }


  /// Return type of data its connected to
  FXuint getType() const { return type; }

  /// Return pointer to data its connected to
  void* getData() const { return data; }


  /// Associate with nothing
  void connect(){ type=DT_VOID; data=NULL; }

  /// Associate with character variable
  void connect(FXchar& value){ type=DT_CHAR; data=&value; }

  /// Associate with unsigned character variable
  void connect(FXuchar& value){ type=DT_UCHAR; data=&value; }

  /// Associate with signed short variable
  void connect(FXshort& value){ type=DT_SHORT; data=&value; }

  /// Associate with unsigned short variable
  void connect(FXushort& value){ type=DT_USHORT; data=&value; }

  /// Associate with int variable
  void connect(FXint& value){ type=DT_INT; data=&value; }

  /// Associate with unsigned int variable
  void connect(FXuint& value){ type=DT_UINT; data=&value; }

  /// Associate with float variable
  void connect(FXfloat& value){ type=DT_FLOAT; data=&value; }

  /// Associate with double variable
  void connect(FXdouble& value){ type=DT_DOUBLE; data=&value; }

  /// Associate with string variable
  void connect(FXString& value){ type=DT_STRING; data=&value; }
  };



#endif
