button_t.h

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/*
    File        : button_t.h
    Date        : 19-Sep-02
    Description : Class to represent a button toolbox gadget template.

    Copyright © 1995-2002 Alexander Thoukydides

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/

// Only include header file once
#ifndef button_t_h
#define button_t_h

// Include alexlib header files
#ifndef button_b_h
#include "button_b.h"
#endif
#ifndef gadget_t_h
#include "gadget_t.h"
#endif

// A class to represent a button gadget template
class button_t : public virtual gadget_b,
                 public gadget_t,
                 public button_b
{
public:

    /*
        Parameters  : void
        Returns     : -
        Description : Constructor function.
    */
    button_t();

    /*
        Parameters  : value     - The text string to set.
        Returns     : button_t  - This object.
        Description : Set the value of this gadget. To reduce flicker the value
                      is not updated unless it has changed.
    */
    button_t &operator=(const char *value);

    /*
        Parameters  : value     - The text string to set.
        Returns     : button_t  - This object.
        Description : Set the value of this gadget. To reduce flicker the value
                      is not updated unless it has changed.
    */
    button_t &operator=(const string &value);

protected:

    /*
        Parameters  : clear - Icon flags to clear.
                      eor   - Icon flags to toggle.
        Returns     : void
        Description : Representation specific function to set the icon flags
                      for this button.
    */
    virtual void _set_icon_flags(wimp_icon_flags clear, wimp_icon_flags eor);

    /*
        Parameters  : void
        Returns     : wimp_icon_flags   - The current icon flags.
        Description : Representation specific function to get the icon flags
                      for this button.
    */
    virtual wimp_icon_flags _get_icon_flags() const;

    /*
        Parameters  : validation    - The text string to set.
        Returns     : void
        Description : Representation specific function to set the validation
                      string.
    */
    virtual void _set_validation(const char *validation);

    /*
        Parameters  : validation    - Pointer to buffer to hold the validation
                                      string, or NULL to read the size of
                                      buffer required.
                      size          - The size of the buffer.
        Returns     : size_t        - Number of bytes written to the buffer, or
                                      the buffer size required if NULL passed.
        Description : Representation specific function to get the validation
                      string or the buffer size required.
    */
    virtual size_t _get_validation(char *validation, size_t size) const;

    /*
        Parameters  : value - The text string to set.
        Returns     : void
        Description : Gadget specific function to set the value.
    */
    virtual void _set_value(const char *value);

    /*
        Parameters  : value     - Pointer to buffer to hold the value, or NULL
                                  to read the size of buffer required.
                      size      - The size of the buffer.
        Returns     : size_t    - Number of bytes written to the buffer, or
                                  the buffer size required if NULL passed.
        Description : Gadget specific function to get the value or the buffer
                      size required.
    */
    virtual size_t _get_value(char *value, size_t size) const;
};

#endif

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