Example MVC in Qt C++

Renn

I want to ask about MVC in Qt C++
Can anyone give an example of a very simple MVC to me? I want to learn MVC in Qt C++

jsulm

Take a look at this introduction:
http://doc.qt.io/qt-5.5/model-view-programming.html

Renn

@jsulm Qt means no MVC, but the Model View and Delegate?

jsulm

Yes, that's the Qt way to do it

Renn

@jsulm ModelViewDelegate in one file if it can be called ModelViewDelegate?

jsulm

Why in one file? You should separate the model, view and delegate even on file level.

Renn

@jsulm I need an example of a project so that I was not confused

jsulm

On the side I provided you there are links to examples:
http://doc.qt.io/qt-5.5/model-view-programming.html#related-examples

Renn

@jsulm Code like this can be called Model View Delegate?

MVC.pro
QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = MVC
TEMPLATE = app

SOURCES += main.cpp
mvc.cpp
model.cpp

HEADERS += mvc.h
model.h

FORMS += mvc.ui

model.h

#ifndef MODEL_H
#define MODEL_H

#include <QDialog>

class Model : public QDialog
{
Q_OBJECT

public:
explicit Model(QWidget *parent = 0);

signals:
void sendFromData(int);

private slots:
void receiveData(QStringList);

public slots:

private:
int hitung1, hitung2;

};

#endif // MODEL_H

mvc.h

#ifndef MVC_H
#define MVC_H

#include <QMainWindow>
#include "model.h"

namespace Ui {
class Mvc;
}

class Mvc : public QMainWindow
{
Q_OBJECT

public:
explicit Mvc(QWidget *parent = 0);
~Mvc();

private slots:
void on_hitungAngka_clicked();

void receiveFromData(int);

signals:
void sendData(QStringList);

private:
Ui::Mvc *ui;

Model *model;

int angkaPertama, angkaKedua;

};

#endif // MVC_H

main.cpp

#include "mvc.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Mvc w;
w.show();

return a.exec();

}

model.cpp

#include "model.h"
#include <QDebug>

Model::Model(QWidget *parent) :
QDialog(parent)
{
}
void Model::receiveData(QStringList sl)
{
int hasil;
hitung1 = sl[0].toInt();
hitung2 = sl[1].toInt();
hasil = hitung1 + hitung2;
emit sendFromData(hasil);
}

mvc.cpp

#include "mvc.h"
#include "ui_mvc.h"
#include <QDebug>

Mvc::Mvc(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::Mvc)
{
ui->setupUi(this);
}

Mvc::~Mvc()
{
delete ui;
}

void Mvc::on_hitungAngka_clicked()
{
model = new Model(this);
QStringList sl;
sl.append(ui->input1->text());
sl.append(ui->input2->text());
connect(this, SIGNAL(sendData(QStringList)), model, SLOT(receiveData(QStringList)));
connect(model, SIGNAL(sendFromData(int)), this, SLOT(receiveFromData(int)));
emit sendData(sl);
}

void Mvc::receiveFromData(int hasil)
{
qDebug() << hasil;
}

jsulm

No:
Model has to be a subclass of QAbstractItemModel (see http://doc.qt.io/qt-4.8/model-view-programming.html#model-classes).
Not sure why you subclass QMainWindow.

Renn

@jsulm Is it in the file model.cpp, and model.h?

Renn

@jsulm What should i change?

Renn

@jsulm I have another project, this code can be called Model View Delegate?

ModView.pro

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = ModView
TEMPLATE = app

SOURCES += main.cpp
dialog.cpp

HEADERS += dialog.h

FORMS += dialog.ui

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QtGui>
#include <QtCore>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
Q_OBJECT

public:
explicit Dialog(QWidget *parent = 0);
~Dialog();

private slots:
void on_insert_clicked();

void on_update_clicked();

void on_delete_2_clicked();

private:
Ui::Dialog *ui;
QStringListModel *model;
};

#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
model = new QStringListModel(this);
QStringList list;
model->setStringList(list);
ui->listView->setModel(model);
ui->comboBox->setModel(model);

ui->listView->setEditTriggers(QAbstractItemView::AnyKeyPressed | QAbstractItemView::DoubleClicked);

}

Dialog::~Dialog()
{
delete ui;
}

//insert
void Dialog::on_insert_clicked()
{
int row = model->rowCount();
model->insertRows(row,1);

QModelIndex index = model->index(row);
ui->listView->setCurrentIndex(index);
ui->listView->edit(index);

}

//update
void Dialog::on_update_clicked()
{
int row = ui->listView->currentIndex().row();
model->insertRows(row,1);

QModelIndex index = model->index(row);
ui->listView->setCurrentIndex(index);
ui->listView->edit(index);

}

//delete
void Dialog::on_delete_2_clicked()
{
model->removeRows(ui->listView->currentIndex().row(),1);
}

main.cpp

#include "dialog.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Dialog w;
w.show();

return a.exec();

}