Error in using MultiPageWidget from QtDesigner

MostafaEzzat

Hello , I Want to use MultiPageWidget in QtDesigner
this is the url of the image of Widget : "https://ibb.co/cDzBZ6K"

so i searched how to use it and reached to this document
https://doc-snapshots.qt.io/4.8/designer-containerextension.html#multipagewidget-class-definition
and made everything as mentioned
this is .pro file

#-------------------------------------------------
#
# Project created by QtCreator 2018-12-24T22:54:39
#
#-------------------------------------------------

QT  += core gui sql

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets designer

TARGET = Hospital-ClinicSoftware
TEMPLATE += app lib

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

CONFIG += c++11 designer plugin

SOURCES += \
        main.cpp \
        mainwindow.cpp \
    mainprocess.cpp \
    showingdata.cpp \
    delgate.cpp \
    profile3.cpp \
    profile.cpp \
            /usr/lib64/qt5/examples/designer/containerextension/multipagewidget.cpp \
            /usr/lib64/qt5/examples/designer/containerextension/multipagewidgetplugin.cpp \
            /usr/lib64/qt5/examples/designer/containerextension/multipagewidgetcontainerextension.cpp \
            /usr/lib64/qt5/examples/designer/containerextension/multipagewidgetextensionfactory.cpp

HEADERS += \
        mainwindow.h \
    mainprocess.h \
    showingdata.h \
    delgate.h \
    profile3.h \
    profile.h \
 /usr/lib64/qt5/examples/designer/containerextension/multipagewidget.h \
            /usr/lib64/qt5/examples/designer/containerextension/multipagewidgetplugin.h \
            /usr/lib64/qt5/examples/designer/containerextension/multipagewidgetcontainerextension.h \
            /usr/lib64/qt5/examples/designer/containerextension/multipagewidgetextensionfactory.h



FORMS += \
     mainwindow.ui \
    mainprocess.ui \
    showingdata.ui \
    profile3.ui \
    profile.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path += /opt/$${TARGET}/bin $$[QT_INSTALL_PLUGINS]/designer
!isEmpty(target.path): INSTALLS += target

this is an image of multipagewidget.cpp
and error i get while compiling
the url of the image : "https://ibb.co/cDzBZ6K"

this is profile.h and libraries i've included and this also the profile.ui which i want to use this widget in

#ifndef PROFILE_H
#define PROFILE_H

#include <QWidget>
#include <QApplication>
#include <QtSql>
#include <QtDebug>
#include <QSqlDatabase>
#include <QSqlQueryModel>
#include <QDebug>
#include <QSqlQuery>
#include <QMessageBox>
#include <QSqlDriver>
#include <QVector>
#include <QCheckBox>
#include <QStackedWidget>
#include <QtDesigner>
#include <QDesignerContainerExtension>

JonB

@MostafaEzzat
So the error message states it cannot find multipagewidget.h. Have you copied that to somewhere it can be found for your project you want to use it in, or where are you expecting it to find it?

MostafaEzzat

@JonB
Actually it gives an errors in multipagewidget.h itself which downloaded with Qt5 Files
and the errors are :
1-/usr/lib64/qt5/examples/designer/containerextension/multipagewidget.cpp:62: error: ‘QStringLiteral’ was not declared in this scope
comboBox->setObjectName(QStringLiteral("__qt__passive_comboBox"));
^~~~~~~~~~~~~~
2-/usr/lib64/qt5/examples/designer/containerextension/multipagewidget.cpp:64: error: ‘QOverload’ was not declared in this scope
connect(comboBox, QOverload<int>::of(&QComboBox::activated),
^~~~~~~~~
3-/usr/lib64/qt5/examples/designer/containerextension/multipagewidget.cpp:64: error: expected primary-expression before ‘int’
connect(comboBox, QOverload<int>::of(&QComboBox::activated),
^~~
4-/usr/lib64/qt5/examples/designer/containerextension/multipagewidget.cpp:111: error: ‘windowTitleChanged’ is not a member of ‘QWidget’
connect(page, &QWidget::windowTitleChanged,
^~~~~~~~~~~~~~~~~~
and this the image of multipagewidget.cpp 's errors
url : https://ibb.co/cDzBZ6K

this is multiwidget.h file

/****************************************************************************
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** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
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** accordance with the commercial license agreement provided with the
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** Alternatively, you may use this file under the terms of the BSD license
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**     notice, this list of conditions and the following disclaimer.
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#ifndef MULTIPAGEWIDGET_H
#define MULTIPAGEWIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
class QComboBox;
class QStackedWidget;
QT_END_NAMESPACE

//! [0]
class MultiPageWidget : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(int currentIndex READ currentIndex WRITE setCurrentIndex)
    Q_PROPERTY(QString pageTitle READ pageTitle WRITE setPageTitle STORED false)

public:
    explicit MultiPageWidget(QWidget *parent = nullptr);

    QSize sizeHint() const override;

    int count() const;
    int currentIndex() const;
    QWidget *widget(int index);
    QString pageTitle() const;

public slots:
    void addPage(QWidget *page);
    void insertPage(int index, QWidget *page);
    void removePage(int index);
    void setPageTitle(QString const &newTitle);
    void setCurrentIndex(int index);

private slots:
    void pageWindowTitleChanged();

signals:
    void currentIndexChanged(int index);
    void pageTitleChanged(const QString &title);

private:
    QStackedWidget *stackWidget;
    QComboBox *comboBox;
};
//! [0]

#endif

JonB

@MostafaEzzat
The image link you show, just like before, just shows "cannot find multipagewidget.h" from your source file. If it can't find it then it can't give errors from inside it. I'll leave it someone else, you need to sort how you are building.

MostafaEzzat

@JonB
OOPS , Sorry i missed

this is the image of error and the errors it self in the previous reply
url : "https://ibb.co/CMFk540"

and this image for including multipagewidget in ui_profile.h
url :"https://ibb.co/gRJ8kCL"

mrjj

Hi
Just as a note.
There is also QStackedWidget which is a multi page widget.
https://doc.qt.io/qt-5/qstackedwidget.html#details

MostafaEzzat

@mrjj
Yeah , i know QStackedWidget and used it in this Design but i've many stuff so i need multipagewidget to container these stuff in it and MultiPageWidget similar to QToolBox in containg the stuff and MultiPageWidget the Perfect solution here

mrjj

@MostafaEzzat
Ok. fair enough.
You are using the Qt5 version ? (seems so)
C:\Qt\Examples\Qt-5.12.0\designer\containerextension
I just tried open it in Creator and it just compiled and generated the .DLL ( the plugin)

So are you trying to use this in Qt4 ?

Im wondering why you get error as it just compiles here.

Also it seems that you are adding the sources to your app ?
And not create the SO file ( the plugin ) and copy it to designers plugin dir for it to load
when run.
So do you mean you want to use as a true plugin or simply use the Widget via promotion ?

MostafaEzzat

@mrjj
Thank you alot it works now , but just for curiosity why didn't it work with qt-qmake4 ?
i've both qt4-qmake and qt5-qmake and compiled this widget with qt-qmake5 and worked and the errors was on qt-qmake4 .. so if i wanna compile it with qt-qmake4 what should i do?
the widget after displaying : "https://ibb.co/wSZ9S7V"

mrjj

Hi
Congrats, you fist Designer plugin :)
Well with qt-qmake4 it would use Qt4 headers and stuff like QStringLiteral ( from Qt5.0) and QOverload (from Qt 5.7.)
is not defined there.
You can replace QStringLiteral with nothing and QOverload with ~~static_cast~~
with SIGNAL/SLOT macros.
However, you could also just find the same sample in Qt4 samples.
(it seems to have existed back there)

Anyway, if you build and use the actual Designer plugin, im not sure Creator will load it (if compiled with Qt4)
as Creator Qt5 based (unless its old version).

You also need at Qt4 version besides the Qt5 version or why, if i may ask?

JonB

@MostafaEzzat

Thank you alot it works now , but just for curiosity why didn't it work with qt-qmake4 ?

When you build with qt4-qmake you are compiling for Qt 4; when you build with qt5-qmake you are compiling for Qt 5.
There are changes in the Qt functions between Qt 4 and Qt 5.
Code written for one of these may not compile in the other.
You are using an example supplied with Qt 5 (-/usr/lib64/qt5/examples/designer/containerextension).
For example, I saw one of your error messages was 'windowTitleChanged' is not a member of 'QWidget'. Qt 5 documentation shows https://doc.qt.io/qt-5/qwidget.html#windowTitleChanged, and says "This function was introduced in Qt 5.2.". Qt 4 documentation https://doc.qt.io/archives/qt-4.8/qwidget.html shows it did not exist back then.
This means that line of code must have been added just for Qt 5.
If you try to compile that for Qt 4 it will error as you have seen.
You would need the code of that example as it was supplied in Qt 4 if you want to build for Qt 4. Or you have to make all necessary edits yourself.

MostafaEzzat

@mrjj

@mrjj said in Error in using MultiPageWidget from QtDesigner:

Hi
Congrats, you fist Designer plugin :)
Well with qt-qmake4 it would use Qt4 headers and stuff like QStringLiteral ( from Qt5.0) and QOverload (from Qt 5.7.)
is not defined there.
You can replace QStringLiteral with nothing and QOverload with ~~static_cast~~
with SIGNAL/SLOT macros.
However, you could also just find the same sample in Qt4 samples.
(it seems to have existed back there)

Anyway, if you build and use the actual Designer plugin, im not sure Creator will load it (if compiled with Qt4)
as Creator Qt5 based (unless its old version).

You also need at Qt4 version besides the Qt5 version or why, if i may ask?

Sure , First of all thank you for your help

in the first i had only qt4 then my OS (which is fedora 29) lost his grub and also Windows but i was owning my project when installed a new Systems , i faced many problems in connecting the database and so on so i downloaded qt4 then qt5 coz qt5 downloaded with all .so files of mysql but qt5 consumes too much memory while compiling and make the system freezing Especially with GNOME but the final project will be compiled in Qt5 (and i guess i've to sober in using Qt5 Libraries For Performance .. right ? or it included the main Libraries ? )

MostafaEzzat

@JonB said in Error in using MultiPageWidget from QtDesigner:

Thank you maybe i'll give it a try in someday ..

mrjj

@MostafaEzzat
Hi
Qt4 is really old so new development is best to do on Qt5.
And all the new stuff comes in Qt5+. So yes, much more fun to use.

How much memory do you have?

MostafaEzzat

@mrjj
i've 4 gb Ram when i use Qt5 and compile the code the memory usage reaches about 2.9 GB maybe more but i ain't know why only Qt5 make the system freezing (but i'll try the new upgrade of the system and see it again )