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. :D

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/getting-started/getting-started#read-the-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

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

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);
}

main.cpp


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

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

return a.exec();
}