Model-view-controller example?

[brcain]

Hello,

Does anyone have Qt-based MVC examples to share?

It'd be a great addition to the "official" examples ... perhaps a tutorial.

Cheers,
Ben

[Everall]

you could try the Links on top of this page. There is a lot of non official QT stuff to enjoy

What is it you want to learn/do exactly? .

Cheers

[brcain]

you could try the Links on top of this page. There is a lot of non official QT stuff to enjoy

I'll do that ... still navigating my way through this forum.

What is it you want to learn/do exactly? .

Specifically, I want to get my hands around MVC and QT. I have a cursory knowledge of Qt ... a somewhat better understanding of MVC. I believe MVC is one of today's best practices for developing robust GUI applications. It just seems like it should be an "official" tutorial ... in my humble opinion that is.

I've seen MVC done a few ways ... subject/observer, listener pattern, etc. However, I'm still wrestling with issues/limitations of different approaches ... and was hoping others might have observations to share.

[shankarnag]

Here is simple model view controller code, which will show in multiple views

QFileSystemModel* model = new QFileSystemModel;
model->setRootPath( QDir::root().path() );

ui->listView->setModel(model);
ui->treeView->setModel(model);
ui->tableView->setModel(model);
ui->columnView->setModel(model);

You need to use signals and slots for communications between model/view

[JD2000]

A slightly dated version of the official QT book is available online, the section dealing with models is pretty good:

http://qt.nokia.com/developer/gettin...he-official-qt

[renaldi2108]

Check my 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

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

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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 insertData();
 
    void updateData();
 
    void deleteData();
 
private:
    Ui:: Dialog *ui;
    QStringListModel *model;
};
 
#endif // 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 insertData();

    void updateData();

    void deleteData();

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

#endif // DIALOG_H

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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);
 
    connect(ui->insert, SIGNAL(clicked()), this, SLOT(insertData()));
    connect(ui->update, SIGNAL(clicked()), this, SLOT(updateData()));
    connect(ui->delete_2, SIGNAL(clicked()), this, SLOT(deleteData()));
}
 
Dialog::~Dialog()
{
    delete ui;
}
 
void Dialog::insertData()
{
    int row = model->rowCount();
    model->insertRows(row ,1);
 
    QModelIndex index = model->index(row);
    ui->listView->setCurrentIndex(index);
    ui->listView->edit(index);
}
 
void Dialog::updateData()
{
    int row = ui->listView->currentIndex().row();
    model->insertRows(row, 0);
    QModelIndex index = model->index(row);
    ui->listView->setCurrentIndex(index);
    ui->listView->edit(index);
}
 
void Dialog:: deleteData()
{
    int row = ui->listView->currentIndex().row();
    model->removeRows(row, 1);
}

#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);

    connect(ui->insert, SIGNAL(clicked()), this, SLOT(insertData()));
    connect(ui->update, SIGNAL(clicked()), this, SLOT(updateData()));
    connect(ui->delete_2, SIGNAL(clicked()), this, SLOT(deleteData()));
}

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

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

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

void Dialog::updateData()
{
    int row = ui->listView->currentIndex().row();
    model->insertRows(row, 0);
    QModelIndex index = model->index(row);
    ui->listView->setCurrentIndex(index);
    ui->listView->edit(index);
}

void Dialog:: deleteData()
{
    int row = ui->listView->currentIndex().row();
    model->removeRows(row, 1);
}

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main.cpp

#include "dialog.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog w;
    w.show();
 
    return a.exec();
}

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

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

    return a.exec();
}

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