source: OGRE/trunk/ogre_dependencies/Dependencies/include/CEGUI/CEGUIProperty.h @ 692

Revision 692, 5.3 KB checked in by mattausch, 19 years ago (diff)

adding ogre 1.2 and dependencies

Line 
1/************************************************************************
2        filename:       CEGUIProperty.h
3        created:        21/2/2004
4        author:         Paul D Turner
5       
6        purpose:        Defines the Property class which forms part of a
7                                PropertySet
8*************************************************************************/
9/*************************************************************************
10    Crazy Eddie's GUI System (http://www.cegui.org.uk)
11    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)
12
13    This library is free software; you can redistribute it and/or
14    modify it under the terms of the GNU Lesser General Public
15    License as published by the Free Software Foundation; either
16    version 2.1 of the License, or (at your option) any later version.
17
18    This library is distributed in the hope that it will be useful,
19    but WITHOUT ANY WARRANTY; without even the implied warranty of
20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21    Lesser General Public License for more details.
22
23    You should have received a copy of the GNU Lesser General Public
24    License along with this library; if not, write to the Free Software
25    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
26*************************************************************************/
27#ifndef _CEGUIProperty_h_
28#define _CEGUIProperty_h_
29
30#include "CEGUIBase.h"
31#include "CEGUIString.h"
32
33
34// Start of CEGUI namespace section
35namespace CEGUI
36{
37
38/*!
39\brief
40        Dummy base class to ensure correct casting of receivers.
41*/
42class CEGUIEXPORT PropertyReceiver
43{
44public:
45        PropertyReceiver() {}
46        virtual ~PropertyReceiver() {}
47};
48
49
50/*!
51\brief
52        An abstract class that defines the interface to access object properties by name.
53
54        Property objects allow (via a PropertySet) access to certain properties of objects
55        by using simple get/set functions and the name of the property to be accessed.
56*/
57class CEGUIEXPORT Property
58{
59public:
60        /*!
61        \brief
62                Creates a new Property object.
63
64        \param name
65                String containing the name of the new Property.
66
67        \param help
68                String containing a description of the Property and it's usage.
69               
70        \param defaultValue
71                String holding the textual representation of the default value for this Property
72
73    \param writesXML
74        Specifies whether the writeXMLToStream method should do anything for this Property.  This
75        enables selectivity in what properties within a PropertySet will get output as XML.
76        */
77        Property(const String& name, const String& help, const String& defaultValue = "", bool writesXML = true) :
78          d_name(name),
79          d_help(help),
80          d_default(defaultValue),
81          d_writeXML(writesXML)
82        {
83        }
84
85
86        /*!
87        \brief
88                Destructor for Property objects
89        */
90        virtual ~Property(void) {}
91
92
93        /*!
94        \brief
95                Return a String that describes the purpose and usage of this Property.
96
97        \return
98                String that contains the help text
99        */
100        const String& getHelp(void) const               {return d_help;}
101
102
103        /*!
104        \brief
105                Return a the name of this Property
106
107        \return
108                String containing the name of the Property
109        */
110        const String& getName(void) const               {return d_name;}
111
112
113        /*!
114        \brief
115                Return the current value of the Property as a String
116
117        \param receiver
118                Pointer to the target object.
119
120        \return
121                String object containing a textual representation of the current value of the Property
122        */
123        virtual String  get(const PropertyReceiver* receiver) const = 0;
124
125
126        /*!
127        \brief
128                Sets the value of the property
129
130        \param receiver
131                Pointer to the target object.
132
133        \param value
134                A String object that contains a textual representation of the new value to assign to the Property.
135
136        \return
137                Nothing.
138
139        \exception InvalidRequestException      Thrown when the Property was unable to interpret the content of \a value.
140        */
141        virtual void    set(PropertyReceiver* receiver, const String& value) = 0;
142
143
144        /*!
145        \brief
146                Returns whether the property is at it's default value.
147
148        \param receiver
149                Pointer to the target object.
150
151        \return
152                - true if the property has it's default value.
153                - false if the property has been modified from it's default value.
154        */
155        virtual bool    isDefault(const PropertyReceiver* receiver) const;
156
157
158        /*!
159        \brief
160                Returns the default value of the Property as a String.
161
162        \param receiver
163                Pointer to the target object.
164
165        \return
166                String object containing a textual representation of the default value for this property.
167        */
168        virtual String  getDefault(const PropertyReceiver* receiver) const;
169
170
171    /*!
172    \brief
173        Writes out an XML representation of this class to the given stream.
174
175    \note
176        This would normally have been implemented via XMLGenerator base class, but in this
177        case we require the target PropertyReceiver in order to obtain the property value.
178    */
179    void writeXMLToStream(const PropertyReceiver* receiver, OutStream& out_stream) const;
180
181protected:
182        String  d_name;         //!< String that stores the Property name.
183        String  d_help;         //!< String that stores the Property help text.
184        String  d_default;      //!< String that stores the Property default value string.
185        bool    d_writeXML; //!< Specifies whether writeXMLToStream should do anything for this property.
186};
187
188} // End of  CEGUI namespace section
189
190#endif  // end of guard _CEGUIProperty_h_
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