How to convert . qt3->qt4 . kde3->kde4

This may be a help, for new contributors to the qt4/kde4 port of rosegarden. It may also serve to see, what could be replaced with “search'n replace scripts”. If possible, avoid to use the Q3Support and includes. Use the new Qt4 classes instead. Reason: Q3Support doesn't work as well, as it one might expect and we need to move to Qt4 anyway.

examples

(if you find something new, add it on the top !)

(if you find something wrong, tell how it would be better.)


errMsg = i18n(QString("Could not open") );
==>
errMsg = i18n(QString("Could not open").toUtf8() );
or
errMsg = i18n(QString("Could not open").toUtf8().data() );
(?)

Casting std::string to (const char*)
==>
const char * s = st.c_str()


string.lower()
==>
string.toLower()


outStream.setEncoding('UTF-8')
==>
outStream.setCodec( (char*)"UTF-8" );



QProgressBar->setProgress(9)
==>
QProgressBar->setValue(9)



if (extraAttributes)		// where extraAttributes is QString
==>
if ( ! extraAttributes.isEmpty() )




KConfig* config = KGlobal::config();
config->setGroup(GeneralOptionsConfigGroup);
v = config->readUnsignedNumEntry( .. )
==>
// default group:
KConfigGroup gconfig = KGlobal::config()->group("");
// or custom:
KConfigGroup  config = KGlobal::config()->group( GeneralOptionsConfigGrou p);
// 
// Note the dot instead of "->"
v = (unsigned int) config.readEntry( .. )



QStringList::split(',', recordStr);
==>
recordStr.split(,);


QVBox *vbox = new QVBox;
QPushButton *child1 = new QPushButton(vbox);
==>
QWidget *vbox = new QWidget;
QPushButton *child1 = new QPushButton;
//
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(child1);
vbox->setLayout(layout);

 
 
dev/notes_on_porting_to_qt4_examples.txt · Last modified: 2013/07/02 12:55 (external edit)
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