Did I say I love C++ templates.

MetaProgramming is fun

Here is my template based on Lokis and Simons work to
quicklaunch applications

1 files changed, 262 insertions, 0 deletions

diff --git a/libopie/oapplicationfactory.h b/libopie/oapplicationfactory.h
new file mode 100644
index 0000000..418a82e
--- a/dev/null
+++ b/libopie/oapplicationfactory.h
@@ -0,0 +1,262 @@
+/*
+ This work is derived from:
+ ----
+ The Loki Library
+ Copyright (c) 2001 by Andrei Alexandrescu
+ This code accompanies the book:
+ Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
+     Patterns Applied". Copyright (c) 2001. Addison-Wesley.
+ Permission to use, copy, modify, distribute and sell this software for any
+     purpose is hereby granted without fee, provided that the above copyright
+     notice appear in all copies and that both that copyright notice and this
+     permission notice appear in supporting documentation.
+ The author or Addison-Welsey Longman make no representations about the
+     suitability of this software for any purpose. It is provided "as is"
+     without express or implied warranty.
+ ----
+
+  And KGenericFactor et all from Simon Hausmann <tronical@kde.org>
+
+*/
+
+#include <qstring.h>
+#include <qmetaobject.h>
+
+#include <qtopia/qcom.h>
+#include <qtopia/applicationinterface.h>
+
+namespace Opie {
+    struct NullType;
+
+    template <class T, class U>
+    struct Typelist
+    {
+       typedef T Head;
+       typedef U Tail;
+    };
+    template<
+        typename T1  = NullType, typename T2  = NullType, typename T3  = NullType,
+        typename T4  = NullType, typename T5  = NullType, typename T6  = NullType,
+        typename T7  = NullType, typename T8  = NullType, typename T9  = NullType,
+        typename T10 = NullType, typename T11 = NullType, typename T12 = NullType,
+        typename T13 = NullType, typename T14 = NullType, typename T15 = NullType,
+        typename T16 = NullType, typename T17 = NullType, typename T18 = NullType
+        >
+    struct MakeTypelist{
+    private:
+    typedef typename MakeTypelist
+    <
+        T2 , T3 , T4 ,
+        T5 , T6 , T7 ,
+        T8 , T9 , T10,
+        T11, T12, T13,
+        T14, T15, T16,
+        T17, T18
+        >
+    ::Result TailResult;
+
+public:
+    typedef Typelist<T1, TailResult> Result;
+};
+
+template<>
+struct MakeTypelist<>
+{
+    typedef NullType Result;
+};
+
+}
+
+/**
+ * To allow your application to be quick launched some one needs
+ * to create the QWidget.
+ * This is this factory. Make surce your widget has static QString Widget::appName()
+ * as one of its functions.
+ *
+ * This template takes one QWidget and initialized it in the form of
+ *  MyWidget::MyWidget( QWidget* parent, const char* name, WFlags f );
+ *
+ * To use it on your app do that:
+ * typedef OApplicationFactory<MyWidget> MyFactory;
+ * OPIE_EXPORT_APP( MyFactory )
+ *
+ */
+template <class Product>
+struct OApplicationFactory : public ApplicationInterface {
+    QRESULT queryInterface( const QUuid &uuid, QUnknownInterface **iface ) {
+        *iface = 0;
+        if ( uuid == IID_QUnknown ) *iface = this;
+        else if ( uuid == IID_QtopiaApplication ) *iface = this;
+        else return QS_FALSE;
+        (*iface)->addRef();
+        return QS_OK;
+    }
+
+    /*
+     *
+     */
+    virtual QWidget *createMainWindow( const QString& appName, QWidget* parent,
+                                       const char* name, Qt::WFlags f ) {
+        if (appName == Product::appName() )
+            return new Product(parent, name, f );
+        else
+            return 0l;
+    }
+
+    virtual QStringList applications()const {
+        QStringList list;
+        list << Product::appName() ;
+
+        return list;
+    }
+    Q_REFCOUNT
+
+};
+
+
+/* Internal */
+
+template< class Product >
+struct OPrivate {
+    inline static QWidget *multiFactory( const QString& appName, QWidget* parent,
+                           const char* name, Qt::WFlags fl ) {
+        if ( appName == Product::appName() )
+            return new Product( parent, name, fl );
+        else
+            return 0;
+    }
+
+    inline static QStringList multiString( const QStringList& _list ) {
+        QStringList list = _list;
+        list << Product::appName();
+        return list;
+    }
+};
+
+template <>
+struct OPrivate<Opie::NullType > {
+    inline static QWidget* multiFactory ( const QString& , QWidget* ,
+                            const char* , Qt::WFlags ) {
+        return 0l;
+    }
+    inline static QStringList multiString( const QStringList& _list ) {
+        return _list;
+    }
+};
+
+/*
+template <>
+struct OPrivate <Opie::NullType, Opie::NullType > {
+    inline static QWidget* multiFactory( const QString& , QWidget* ,
+                           const char* , Qt::WFlags  ) {
+        return 0l;
+    }
+
+    inline static QStringList multiString( const QStringList& _list ) {
+        return _list;
+    }
+};
+*/
+
+template <class Product, class ProductListTail>
+struct OPrivate< Opie::Typelist<Product, ProductListTail> > {
+    inline static QWidget* multiFactory( const QString& appName, QWidget* parent,
+                           const char* name, Qt::WFlags fl) {
+        QWidget* wid = OPrivate<Product>::multiFactory( appName, parent, name, fl );
+
+        if (!wid )
+            wid = OPrivate<ProductListTail>::multiFactory( appName, parent, name, fl );
+
+        return wid;
+    }
+
+    inline static QStringList multiString( const QStringList& _list ) {
+        QStringList list = _list;
+
+        list = OPrivate<Product>::multiString( list );
+        list = OPrivate<ProductListTail>::multiString( list );
+
+        return list;
+    }
+};
+
+
+
+
+
+
+
+
+/* Internal END */
+
+/*
+ * If you want to export more than one Widget use that function
+ * Make sure all your Widgets provide the appName() static method
+ * otherwise you'll get a compiler error
+ *
+ * typedef Opie::MakeTypeList<MyWidget, MyDialog, MyMediaPlayer >::Result MyTypes;
+ * OPIE_EXPORT_APP( OApplicationFactory<MyTypes> )
+ */
+
+template<class Product, class ProductListTail>
+struct OApplicationFactory< Opie::Typelist<Product, ProductListTail > >
+    : ApplicationInterface {
+    QRESULT queryInterface( const QUuid &uuid, QUnknownInterface **iface ) {
+        *iface = 0;
+        if ( uuid == IID_QUnknown ) *iface = this;
+        else if ( uuid ==IID_QtopiaApplication ) *iface = this;
+        else return QS_FALSE;
+        (*iface)->addRef();
+        return QS_OK;
+    }
+
+    QWidget* createMainWindow ( const QString& appName, QWidget* parent,
+                                const char* name, Qt::WFlags fl ) {
+        qWarning("StringList is %s", applications().join(":").latin1() );
+        return OPrivate< Opie::Typelist<Product, ProductListTail > >::multiFactory( appName, parent, name, fl );
+    }
+
+    QStringList applications()const {
+        QStringList _list;
+        return OPrivate< Opie::Typelist<Product, ProductListTail> >::multiString( _list );
+    }
+
+    Q_REFCOUNT
+};
+
+
+/* If the library version should be build */
+#ifdef OPIE_APP_INTERFACE
+#define OPIE_EXPORT_APP( factory ) Q_EXPORT_INTERFACE() { Q_CREATE_INSTANCE( factory ) }
+#else
+
+#define OPIE_EXPORT_APP( Factory )                                      \
+int main( int argc,  char **argv ) {                                    \
+    QPEApplication a(argc, argv );               \
+    QWidget *mw = 0;\
+\
+    /* method from TT */ \
+    QString executableName = QString::fromLatin1( argv[0] ); \
+    executableName =  executableName.right(executableName.length() \
+            - executableName.findRev('/') - 1); \
+ \
+    Factory f; \
+    QStringList list = f.applications(); \
+    if (list.contains(executableName) ) \
+        mw = f.createMainWindow(executableName, 0, 0, 0 ); \
+    else \
+        mw = f.createMainWindow( list[0], 0, 0, 0 ); \
+\
+    if( mw ) { \
+        if ( mw->metaObject()->slotNames().contains("setDocument(const QString&)" ) ) \
+            a.showMainDocumentWidget( mw ); \
+        else \
+            a.showMainWidget( mw ); \
+\
+        int rv = a.exec(); \
+        delete mw; \
+        return rv; \
+    }else \
+        return -1; \
+}
+#endif