Qt Creator Lubuntu

QTableView example 6: two views on one model is a QTableView example.

This was to demonstrate that if two tables must remain identical, the model/view architecture is an easy way to do so: because the two views work on the same model, they cannot be different.

Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

GUI application

C++ standard:

C++11

Compiler(s):

G++ 4.9.2

Libraries used:

Qt: version 5.4.1 (32 bit)
STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppQTableViewExample6/CppQTableViewExample6.pro


QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

QMAKE_CXXFLAGS += -Wall -Wextra -Werror

TEMPLATE = app

QMAKE_CXXFLAGS += -std=c++11

SOURCES += \

    qtdialog.cpp \

    qtmain.cpp



HEADERS  += qtdialog.h



FORMS    += qtdialog.ui

./CppQTableViewExample6/qtdialog.h


#ifndef QTDIALOG_H

#define QTDIALOG_H



#include <QDialog>



namespace Ui {

  class QtDialog;

}



struct MyModel;



class QtDialog : public QDialog

{

  Q_OBJECT

  

public:

  explicit QtDialog(QWidget *parent = 0);

  ~QtDialog();

  

private slots:



private:

  Ui::QtDialog *ui;



  ///The downcasted model

  MyModel* m_model;

};



#endif // QTDIALOG_H

./CppQTableViewExample6/qtdialog.cpp


#include "qtdialog.h"



#include <cassert>

#include <iostream>

#include <stdexcept>



#include <boost/lexical_cast.hpp>

#include <boost/numeric/conversion/cast.hpp>



#include <QHeaderView>

#include <QStandardItemModel>

#include "ui_qtdialog.h"



struct MyModel : public QStandardItemModel

{

  MyModel(QObject *parent = 0)

    : QStandardItemModel(parent)

  {

    const int n_rows = 3;

    const int n_cols = 4;

    this->setColumnCount(n_cols);

    this->setRowCount(n_rows);

    for (int row = 0; row!=n_rows; ++row)

    {

      for (int col = 0; col!=n_cols; ++col)

      {

        QStandardItem * const item = new QStandardItem;

        const std::string s

          =

            std::string("(")

          + boost::lexical_cast<std::string>(row)

          + std::string(",")

          + boost::lexical_cast<std::string>(row)

          + std::string(")");

        item->setText(s.c_str());

        this->setItem(row,col,item);



      }

    }

  }

};



QtDialog::QtDialog(QWidget *parent) :

  QDialog(parent),

  ui(new Ui::QtDialog),

  m_model(new MyModel(this))

{

  ui->setupUi(this);



  ui->table_left->setModel(m_model);

  ui->table_right->setModel(m_model);

  assert(ui->table_left->model());

  assert(ui->table_right->model());

  assert(m_model);

  assert(ui->table_left->model() == m_model);

  assert(ui->table_right->model() == m_model);

}



QtDialog::~QtDialog()

{

  delete ui;

}

./CppQTableViewExample6/qtmain.cpp


#include <QApplication>

#include "qtdialog.h"



int main(int argc, char *argv[])

{

  QApplication a(argc, argv);

  QtDialog w;

  w.show();

  return a.exec();

}

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(C++) QTableViewExample6

Technical facts

Qt project file: ./CppQTableViewExample6/CppQTableViewExample6.pro

./CppQTableViewExample6/qtdialog.h

./CppQTableViewExample6/qtdialog.cpp

./CppQTableViewExample6/qtmain.cpp