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- /************************************************************************
- filename: CEGUIProperty.h
- created: 21/2/2004
- author: Paul D Turner
-
- purpose: Defines the Property class which forms part of a
- PropertySet
- *************************************************************************/
- /*************************************************************************
- Crazy Eddie's GUI System (http://www.cegui.org.uk)
- Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)
-
- 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
- *************************************************************************/
- #ifndef _CEGUIProperty_h_
- #define _CEGUIProperty_h_
-
- #include "CEGUIBase.h"
- #include "CEGUIString.h"
-
-
- // Start of CEGUI namespace section
- namespace CEGUI
- {
-
- /*!
- \brief
- Dummy base class to ensure correct casting of receivers.
- */
- class CEGUIEXPORT PropertyReceiver
- {
- public:
- PropertyReceiver() {}
- virtual ~PropertyReceiver() {}
- };
-
-
- /*!
- \brief
- An abstract class that defines the interface to access object properties by name.
-
- Property objects allow (via a PropertySet) access to certain properties of objects
- by using simple get/set functions and the name of the property to be accessed.
- */
- class CEGUIEXPORT Property
- {
- public:
- /*!
- \brief
- Creates a new Property object.
-
- \param name
- String containing the name of the new Property.
-
- \param help
- String containing a description of the Property and it's usage.
-
- \param defaultValue
- String holding the textual representation of the default value for this Property
-
- \param writesXML
- Specifies whether the writeXMLToStream method should do anything for this Property. This
- enables selectivity in what properties within a PropertySet will get output as XML.
- */
- Property(const String& name, const String& help, const String& defaultValue = "", bool writesXML = true) :
- d_name(name),
- d_help(help),
- d_default(defaultValue),
- d_writeXML(writesXML)
- {
- }
-
-
- /*!
- \brief
- Destructor for Property objects
- */
- virtual ~Property(void) {}
-
-
- /*!
- \brief
- Return a String that describes the purpose and usage of this Property.
-
- \return
- String that contains the help text
- */
- const String& getHelp(void) const {return d_help;}
-
-
- /*!
- \brief
- Return a the name of this Property
-
- \return
- String containing the name of the Property
- */
- const String& getName(void) const {return d_name;}
-
-
- /*!
- \brief
- Return the current value of the Property as a String
-
- \param receiver
- Pointer to the target object.
-
- \return
- String object containing a textual representation of the current value of the Property
- */
- virtual String get(const PropertyReceiver* receiver) const = 0;
-
-
- /*!
- \brief
- Sets the value of the property
-
- \param receiver
- Pointer to the target object.
-
- \param value
- A String object that contains a textual representation of the new value to assign to the Property.
-
- \return
- Nothing.
-
- \exception InvalidRequestException Thrown when the Property was unable to interpret the content of \a value.
- */
- virtual void set(PropertyReceiver* receiver, const String& value) = 0;
-
-
- /*!
- \brief
- Returns whether the property is at it's default value.
-
- \param receiver
- Pointer to the target object.
-
- \return
- - true if the property has it's default value.
- - false if the property has been modified from it's default value.
- */
- virtual bool isDefault(const PropertyReceiver* receiver) const;
-
-
- /*!
- \brief
- Returns the default value of the Property as a String.
-
- \param receiver
- Pointer to the target object.
-
- \return
- String object containing a textual representation of the default value for this property.
- */
- virtual String getDefault(const PropertyReceiver* receiver) const;
-
-
- /*!
- \brief
- Writes out an XML representation of this class to the given stream.
-
- \note
- This would normally have been implemented via XMLGenerator base class, but in this
- case we require the target PropertyReceiver in order to obtain the property value.
- */
- void writeXMLToStream(const PropertyReceiver* receiver, OutStream& out_stream) const;
-
- protected:
- String d_name; //!< String that stores the Property name.
- String d_help; //!< String that stores the Property help text.
- String d_default; //!< String that stores the Property default value string.
- bool d_writeXML; //!< Specifies whether writeXMLToStream should do anything for this property.
- };
-
- } // End of CEGUI namespace section
-
- #endif // end of guard _CEGUIProperty_h_
-