src/ObjectResource.hh (raw)
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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 |