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// ObjectResource.hh for Fluxbox
// Copyright (c) 2007 Henrik Kinnunen (fluxgen at fluxbox dot org)
// and Simon Bowden (rathnor at users.sourceforge.net)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
// $Id$
#ifndef OBJECTRESOURCE_HH
#define OBJECTRESOURCE_HH
/* This is a generic resource that can be used as an accessor to a value in an object.
The constructors allow to select between:
1a. giving an object of ObjectType, OR
1b. giving a function returning an object of ObjectType
2a. a function that sets a value
2b. a function that toggles a value
*/
template <typename ObjectType, typename ValueType>
class ObjectResource {
public:
typedef ValueType (ObjectType::* getResourceType)() const;
typedef void (ObjectType::* setResourceType)(ValueType);
typedef void (ObjectType::* toggleResourceType)();
typedef ObjectType* (*getResourceObject)();
ObjectResource(ObjectType *object, getResourceType get, setResourceType set, ValueType a_default) :
m_get(get), m_set(set), m_istoggle(false), m_object(object),
m_default(a_default), m_use_accessor(false) {
}
ObjectResource(ObjectType *object, getResourceType get, toggleResourceType toggle, ValueType a_default) :
m_get(get), m_toggle(toggle), m_istoggle(true), m_object(object),
m_default(a_default), m_use_accessor(false) {
}
ObjectResource(getResourceObject object_accessor, getResourceType get, setResourceType set, ValueType a_default) :
m_get(get), m_set(set), m_istoggle(false), m_object_accessor(object_accessor),
m_default(a_default), m_use_accessor(true) {
}
ObjectResource(getResourceObject object_accessor, getResourceType get, toggleResourceType toggle, ValueType a_default) :
m_get(get), m_toggle(toggle), m_istoggle(true), m_object_accessor(object_accessor),
m_default(a_default), m_use_accessor(true) {
}
ObjectResource<ObjectType, ValueType>& operator = (const ValueType newvalue) {
ObjectType * obj = getObject();
if (!obj)
return *this;
if (m_istoggle) {
if (newvalue != (operator*)())
(obj->*m_toggle)();
} else {
(obj->*m_set)(newvalue);
}
return *this;
}
ObjectResource<ObjectType, ValueType>& operator += (const ValueType newvalue) {
ObjectType * obj = getObject();
if (obj && !m_istoggle)
(obj->*m_set)((operator*)()+newvalue);
return *this;
}
ObjectResource<ObjectType, ValueType>& operator -= (const ValueType newvalue) {
ObjectType * obj = getObject();
if (obj && !m_istoggle)
(obj->*m_set)((operator*)()-newvalue);
return *this;
}
// this is a touch dirty, but it makes us compatible with FbTk::Resource<int> in IntResMenuItem
ObjectResource<ObjectType, ValueType>& get() {
return *this;
}
ValueType operator*() {
ObjectType * obj = getObject();
if (!obj)
return m_default;
return (obj->*m_get)();
}
const ValueType operator*() const {
ObjectType * obj = getObject();
if (!obj)
return m_default;
return (obj->*m_get)();
}
private:
// choose one get and one set function
ObjectType * getObject() {
if (m_use_accessor)
return (*m_object_accessor)();
else
return m_object;
}
getResourceType m_get;
union {
setResourceType m_set;
toggleResourceType m_toggle;
};
bool m_istoggle;
union {
ObjectType *m_object;
getResourceObject m_object_accessor;
};
// default is only used when object isn't set (saves crashes)
ValueType m_default;
bool m_use_accessor;
};
#endif // OBJECTRESOURCE_HH
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