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authorzecke <zecke>2003-08-27 08:01:57 (UTC)
committer zecke <zecke>2003-08-27 08:01:57 (UTC)
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Did I say I love C++ templates.
MetaProgramming is fun Here is my template based on Lokis and Simons work to quicklaunch applications
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diff --git a/libopie/oapplicationfactory.h b/libopie/oapplicationfactory.h
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+/*
+ 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