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variant_binding.h

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00001 /* This file is part of the KDE libraries
00002     Copyright (C) 2005, 2006 Ian Reinhart Geiser <geiseri@kde.org>
00003     Copyright (C) 2005, 2006 Matt Broadstone <mbroadst@gmail.com>
00004     Copyright (C) 2005, 2006 Richard J. Moore <rich@kde.org>
00005     Copyright (C) 2005, 2006 Erik L. Bunce <kde@bunce.us>
00006     Copyright (C) 2007, 2008 Sebastian Sauer <mail@dipe.org>
00007 
00008     This library is free software; you can redistribute it and/or
00009     modify it under the terms of the GNU Library General Public
00010     License as published by the Free Software Foundation; either
00011     version 2 of the License, or (at your option) any later version.
00012 
00013     This library is distributed in the hope that it will be useful,
00014     but WITHOUT ANY WARRANTY; without even the implied warranty of
00015     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016     Library General Public License for more details.
00017 
00018     You should have received a copy of the GNU Library General Public License
00019     along with this library; see the file COPYING.LIB.  If not, write to
00020     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00021     Boston, MA 02110-1301, USA.
00022 */
00023 
00024 
00025 #ifndef VARIANT_BINDING_H
00026 #define VARIANT_BINDING_H
00027 
00028 #include <QtCore/QVariant>
00029 
00030 #include <kdemacros.h>
00031 #include <kjs/object.h>
00032 #include <kjs/interpreter.h>
00033 
00034 #include "static_binding.h"
00035 
00042 #define START_VARIANT_METHOD( METHODNAME, TYPE) \
00043 KJS::JSValue *METHODNAME( KJS::ExecState *exec, KJS::JSObject *self, const KJS::List &args ) \
00044 { \
00045         Q_UNUSED(exec);\
00046         Q_UNUSED(self);\
00047         Q_UNUSED(args);\
00048         KJS::JSValue *result = KJS::jsNull(); \
00049         KJSEmbed::VariantBinding *imp = KJSEmbed::extractBindingImp<KJSEmbed::VariantBinding>(exec, self ); \
00050         if( imp ) \
00051         { \
00052                 TYPE value = imp->value<TYPE>();
00053 
00056 #define END_VARIANT_METHOD \
00057                 imp->setValue(qVariantFromValue(value)); \
00058         } \
00059         else \
00060         {\
00061             KJS::throwError(exec, KJS::GeneralError, "We have a problem baby");\
00062         }\
00063         return result; \
00064 }
00065 
00066 #define KJSO_VARIANT_SIMPLE_BINDING_CTOR( NAME, JSNAME, TYPE, BASENAME ) \
00067     NAME::NAME(KJS::ExecState *exec, const char* typeName ) \
00068       : BASENAME( exec, typeName )                    \
00069     { \
00070       StaticBinding::publish( exec, this, NAME::methods() ); \
00071     } \
00072     NAME::NAME(KJS::ExecState *exec, const TYPE & value) \
00073       : BASENAME( exec, QVariant::fromValue(value))                          \
00074     { \
00075       StaticBinding::publish( exec, this, NAME::methods() ); \
00076     }
00077 
00078 namespace KJSEmbed
00079 {
00088     class KJSEMBED_EXPORT VariantBinding : public ProxyBinding
00089     {
00090         public:
00094             VariantBinding( KJS::ExecState *exec, const QVariant &value );
00095             virtual ~VariantBinding() {}
00096 
00097             void *pointer();
00098 
00099             KJS::UString toString(KJS::ExecState *) const;
00100             KJS::UString className() const;
00101 
00105             QVariant variant() const;
00106 
00111             template<typename T>
00112             T value() const { return qVariantValue<T>(m_value); }
00116             void setValue( const QVariant &val );
00117 
00121             QGenericArgument arg(const char *type) const;
00122 
00123             static const KJS::ClassInfo info;
00124 
00125         private:
00126             virtual const KJS::ClassInfo* classInfo() const { return &info; }
00127             QVariant m_value;
00128 
00129     };
00130 
00134     QVariant KJSEMBED_EXPORT extractVariant( KJS::ExecState *exec, KJS::JSValue *value );
00135 
00141     template< typename T>
00142     T extractVariant( KJS::ExecState *exec, KJS::JSValue *arg, const T &defaultValue )
00143     {
00144         if( !arg )
00145             return defaultValue;
00146         else
00147         {
00148             QVariant variant = extractVariant( exec, arg );
00149             if( !variant.isNull() )
00150             {
00151                 if( qVariantCanConvert<T>(variant) )
00152                     return qVariantValue<T>(variant);
00153                 else
00154                 {
00155                     throwError(exec, KJS::TypeError, "Cast failed" );
00156                     return defaultValue;
00157                 }
00158             }
00159             else
00160                 return defaultValue;
00161         }
00162     }
00163 
00168     template< typename T>
00169     T extractVariant( KJS::ExecState *exec, const KJS::List &args, int idx, const T &defaultValue = T())
00170     {
00171         if( args.size() >= idx )
00172         {
00173             return extractVariant<T>( exec, args[idx], defaultValue );
00174         }
00175         else
00176             return defaultValue;
00177     }
00178 
00184     template< typename T>
00185     KJS::JSValue* createVariant(KJS::ExecState *exec, const KJS::UString &className, const T &value)
00186     {
00187         KJS::JSObject *parent;
00188         parent = exec->dynamicInterpreter()->globalObject();
00189         KJS::JSObject *returnValue = StaticConstructor::construct( exec, parent, className );
00190         if( returnValue )
00191         {
00192             // If its a value type setValue
00193             KJSEmbed::VariantBinding *imp = extractBindingImp<KJSEmbed::VariantBinding>(exec, returnValue );
00194             if( imp )
00195                 imp->setValue( qVariantFromValue( value ) );
00196             else
00197             {
00198                 throwError(exec, KJS::TypeError, toUString(QString("Created failed to cast to %1 failed").arg(toQString(className)) ));
00199                 return KJS::jsNull();
00200             }
00201         }
00202         else
00203         {
00204             throwError(exec, KJS::TypeError, toUString(QString("Could not construct a %1").arg(toQString(className) )));
00205             return KJS::jsNull();
00206         }
00207         return returnValue;
00208     }
00209 
00216     QMap<QString, QVariant> KJSEMBED_EXPORT convertArrayToMap( KJS::ExecState *exec, KJS::JSValue *value );
00217 
00224     QList<QVariant> KJSEMBED_EXPORT convertArrayToList( KJS::ExecState *exec, KJS::JSValue *value );
00225 
00229     QStringList KJSEMBED_EXPORT convertArrayToStringList( KJS::ExecState *exec, KJS::JSValue *value );
00230 
00234     QVariant KJSEMBED_EXPORT convertToVariant( KJS::ExecState *exec, KJS::JSValue *value );
00235 
00241     KJSEMBED_EXPORT KJS::JSValue* convertToValue( KJS::ExecState *exec, const QVariant &value );
00242 
00246     struct Method;
00247     class KJSEMBED_EXPORT VariantFactory
00248     {
00249         public:
00250         static const Method VariantMethods[];
00251         static const Method *methods(){ return VariantMethods;}
00252     };
00253 
00254 }
00255 #endif
00256 
00257 //kate: indent-spaces on; indent-width 4; replace-tabs on; indent-mode cstyle;

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