Porting from QT4.6 to QT5

JKSH

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

Then why I am getting this error when I am changing the library to Qt5

Because you also changed your compiler?

Qt Enthusiast

@jsulm

Yes
I changed just the qt version. What is significance of Q_NULLPTR

jsulm

@Qt-Enthusiast Well, if you search a bit you will find this in Qt source:

#ifdef Q_COMPILER_NULLPTR
# define Q_NULLPTR         nullptr
#else
# define Q_NULLPTR         NULL
#endif

If you have a C++11 compiler Q_NULLPTR will be nullptr, else it will be the old C/C++ NULL.
You can use Q_NULLPTR if you have to support older C++ compilers which do not know anything about nullptr and newer C++ compilers.

Qt Enthusiast

how to solve the following error

error: no matching function for call to 'QGraphicsTextItem::QGraphicsTextItem(const char [5], int, QGraphicsScene*&)'
cursor = new QGraphicsTextItem("0, 0", 0, scene);

jsulm

@Qt-Enthusiast Go here and check what constructors QGraphicsTextItem has: http://doc.qt.io/qt-5/qgraphicstextitem.html

Qt Enthusiast

Hi
I saw
http://doc.qt.io/qt-5/qgraphicsscene.html

QGraphicsItem * itemAt(const QPointF &position, const QTransform &deviceTransform) const
QGraphicsItem * itemAt(qreal x, qreal y, const QTransform &deviceTransform) const

buit still could not find the correct fix for compliation error

What const QTransform &deviceTransform shall I use

error: no matching function for call to 'QGraphicsScene::itemAt(QPointF&)'
QPointF m ;
QGraphicsItem *currentItem = scene->itemAt(m);

jsulm

@Qt-Enthusiast http://doc.qt.io/qt-5/qgraphicsscene.html#itemAt has two parameters not one.
Try to pass QTransform() as second parameter.

Qt Enthusiast

I am getting issue

I am getting errors like

file.cxx: In member function 'bool fileMgr::showURL(QString)':
error: 'QWebView' does not name a type
340 static QWebView *sBrowser = NULL;
341 ^

I tried to do
#include QtWebKitWidgets
#include QtWebView

It is giving me an error that not able to find file QtWebKitWidgets .

can some one help me in solving the problem

JKSH

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

It is giving me an error that not able to find file QtWebKitWidgets .

can some one help me in solving the problem

See https://forum.qt.io/topic/76739/webkit-status-2017

Qt Enthusiast

I am using solution

#include <QtWebKit/QtWebKit>
#include <QtWebKitWidgets/QtWebKitWidgets>

is that solution Ok

jsulm

@Qt-Enthusiast Why not simply

#include <QWebView>
```?

JKSH

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

is that solution Ok

Did you read the link I gave you?

Qt Enthusiast

yesI read that from there only I found out and I wanted to confirm the same

JKSH

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

yesI read that from there only I found out and I wanted to confirm the same

You don't need to ask to confirm. You can confirm yourself by trying it.

Qt Enthusiast

QStyleOptionViewItemV4' is deprecated , what should be the solution to fix this

fatal error: QCleanlooksStyle: No such file or directory
compilation terminated.

how to solve these errors

mrjj

@Qt-Enthusiast
Hi
You can use QStyleOptionViewItem directly.

QCleanlooksStyle is worse. why does app need its includes ?
You can compile the old style plugin by yourself, but now is a good
opportunity to get rid of it. So please tell why app needs it.

Any how, its all explained here
http://doc.qt.io/qt-5/sourcebreaks.html
read Changes to QStyle
It also says how to get it back if needed.

Qt Enthusiast

error: 'QFusionStyle' does not name a type
59 hdr->setStyle( new QFusionStyle );

I included the file QTwidgets

not working Need help again

Qt Enthusiast

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

I am using solution

I am using
QHeaderview* heade r = new QHeaderView
#if QT_VERSION >= QT_VERSION_CHECK(5,0,0)
header->setStyle( new QFusionStyle );
#else
header->setStyle( new QCleanlooksStyle );
#endif
I am getting error: 'QFusionStyle' does not name a type

Can some use help in proper usage of fusion style

aha_1980

@Qt-Enthusiast

See here: http://doc.qt.io/qt-5/sourcebreaks.html#changes-to-qstyle

"
QFusionStyle is internal. Recommended alternatives:

QStyleFactory for creating instances of specific styles.
QProxyStyle for customizing existing style implementations.
QCommonStyle as a base for implementing full custom styles.

"

mpergand

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

header->setStyle( new QFusionStyle );

header->setStyle( "Fusion" );  // maybe for QApplication only
// or
header->setStyle( new QStyleFactory::create("Fusion" ));