(C++) QTableViewExample4

 

 

QTableView example 4: custom data is a QTableView example.

 

• View a screenshot of 'QTableViewExample4' (png)
• Download the Qt Creator project 'QTableViewExample4' (zip)

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: ./CppQTableViewExample4/CppQTableViewExample4.pro

 

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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

 

 

 

 

 

./CppQTableViewExample4/qtdialog.h

 

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#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

 

 

 

 

 

./CppQTableViewExample4/qtdialog.cpp

 

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#include "qtdialog.h" #include <cassert> #include <iostream> #include <stdexcept> #include <boost/numeric/conversion/cast.hpp> #include <QHeaderView> #include <QStandardItemModel> #include "ui_qtdialog.h" struct MyDataRow {   MyDataRow(     const bool any_blue,     const bool any_green,     const std::string any_name,     const bool any_red)     : blue(any_blue),       green(any_green),       name(any_name),       red(any_red)   {   }   bool blue;   bool green;   std::string name;   bool red; }; struct MyDataTable {   MyDataTable() : data(CreateTable())  {}   std::vector<MyDataRow> data;   static const std::vector<MyDataRow> CreateTable()   {     return     {       MyDataRow(true,true,"White",true),       MyDataRow(false,false,"Black",false),       MyDataRow(false,false,"Red",true),       MyDataRow(false,true,"Yellow",true),       MyDataRow(false,true ,"Green",false),       MyDataRow(true,true ,"Cyan",false),       MyDataRow(true ,false,"Blue",false),       MyDataRow(true,false,"Magenta",true)     };   } }; struct MyModel : public QStandardItemModel {   MyModel(QObject *parent = 0)     : QStandardItemModel(         0, //rows, will become 8         4, //columns         parent       ),       m_data(MyDataTable())   {     setColumnCount(4);     setHeaderData(0,Qt::Horizontal,"R");     setHeaderData(1,Qt::Horizontal,"G");     setHeaderData(2,Qt::Horizontal,"B");     setHeaderData(3,Qt::Horizontal,"Color");     const int n_rows = boost::numeric_cast<int>(m_data.data.size());     for (int i=0; i!=n_rows; ++i)     {       QList<QStandardItem*> items;       //Add 'R' checkbox       {         QStandardItem * const item = new QStandardItem;         item->setEditable(true);         item->setCheckable(true);         items.push_back(item);       }       //Add 'G' checkbox       {         QStandardItem * const item = new QStandardItem;         item->setEditable(true);         item->setCheckable(true);         items.push_back(item);       }       //Add 'B' checkbox       {         QStandardItem * const item = new QStandardItem;         item->setEditable(true);         item->setCheckable(true);         items.push_back(item);       }       //Add 'Color' checkbox       {         QStandardItem * const item = new QStandardItem;         item->setFlags(           Qt::ItemIsSelectable           | Qt::ItemIsEditable           | Qt::ItemIsEnabled);         items.push_back(item);       }       assert(this->columnCount() == items.size());       this->appendRow(items);     }     if (!(this->rowCount() == boost::numeric_cast<int>(m_data.data.size())))     {       std::cout << this->rowCount() << '\n';     }     assert(this->rowCount() == boost::numeric_cast<int>(m_data.data.size()));   }   ///Implement virtual member function   QVariant data(const QModelIndex &index, int role) const   {     assert(index.isValid());     //Removing this line will cause checkboxes to appear     if (index.column() == 3 && role != Qt::EditRole &&  role != Qt::DisplayRole) return QVariant();     if (!(index.row() < boost::numeric_cast<int>(m_data.data.size())))     {       std::cout << index.row();     }     assert(index.row() < boost::numeric_cast<int>(m_data.data.size()));     assert(index.column() < 4);     const MyDataRow& row = m_data.data[ index.row() ];     switch (index.column())     {       case 0: return row.red   ? Qt::Checked : Qt::Unchecked;       case 1: return row.green ? Qt::Checked : Qt::Unchecked;       case 2: return row.blue  ? Qt::Checked : Qt::Unchecked;       case 3: return QString(row.name.c_str());       default:         assert(!"Should not get here");         throw std::logic_error("MyModel::data");     }   }   ///Implement virtual member function   bool setData(const QModelIndex &index, const QVariant &value, int /* role = Qt::EditRole */)   {     assert(index.isValid());     assert(index.row() < boost::numeric_cast<int>(m_data.data.size()));     assert(index.column() < 4);     MyDataRow& row = m_data.data[ index.row() ];     switch (index.column())     {       case 0: row.red = value.toBool(); break;       case 1: row.green = value.toBool(); break;       case 2: row.blue = value.toBool(); break;       case 3: row.name = value.toString().toStdString(); break;       default:         assert(!"Should not get here");         throw std::logic_error("MyModel::setData");     }     emit dataChanged(index,index);     return true;   }   private:   MyDataTable m_data; }; QtDialog::QtDialog(QWidget *parent) :   QDialog(parent),   ui(new Ui::QtDialog),   m_model(new MyModel(this)) {   ui->setupUi(this);   ui->table->setModel(m_model);   assert(ui->table->model());   assert(m_model);   assert(ui->table->model() == m_model);   ui->table->setColumnWidth(0, 24);   ui->table->setColumnWidth(1, 24);   ui->table->setColumnWidth(2, 24);   ui->table->setColumnWidth(3,175); } QtDialog::~QtDialog() {   delete ui; }

 

 

 

 

 

./CppQTableViewExample4/qtmain.cpp

 

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