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# spreadsheet.cpp Example File
demos/spreadsheet/spreadsheet.cpp

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     ** Foundation and appearing in the file LICENSE.GPL included in the
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     #include <QtGui>
     #include "spreadsheet.h"
     #include "spreadsheetdelegate.h"
     #include "spreadsheetitem.h"
     #include "printview.h"

     SpreadSheet::SpreadSheet(int rows, int cols, QWidget *parent)
             : QMainWindow(parent)
     {
         addToolBar(toolBar = new QToolBar());
         formulaInput = new QLineEdit();

         cellLabel = new QLabel(toolBar);
         cellLabel->setMinimumSize(80, 0);

         toolBar->addWidget(cellLabel);
         toolBar->addWidget(formulaInput);

         table = new QTableWidget(rows, cols, this);
         for (int c = 0; c < cols; ++c) {
             QString character(QChar('A' + c));
             table->setHorizontalHeaderItem(c, new QTableWidgetItem(character));
         }

         table->setItemPrototype(table->item(rows -1, cols - 1));
         table->setItemDelegate(new SpreadSheetDelegate());

         createActions();
         updateColor(0);
         setupMenuBar();
         setupContents();
         setCentralWidget(table);

         statusBar();
         connect(table, SIGNAL(currentItemChanged(QTableWidgetItem*,QTableWidgetItem*)),
                 this, SLOT(updateStatus(QTableWidgetItem*)));
         connect(table, SIGNAL(currentItemChanged(QTableWidgetItem*,QTableWidgetItem*)),
                 this, SLOT(updateColor(QTableWidgetItem*)));
         connect(table, SIGNAL(currentItemChanged(QTableWidgetItem*,QTableWidgetItem*)),
                 this, SLOT(updateLineEdit(QTableWidgetItem*)));
         connect(table, SIGNAL(itemChanged(QTableWidgetItem*)),
                 this, SLOT(updateStatus(QTableWidgetItem*)));
         connect(formulaInput, SIGNAL(returnPressed()), this, SLOT(returnPressed()));
         connect(table, SIGNAL(itemChanged(QTableWidgetItem*)),
                 this, SLOT(updateLineEdit(QTableWidgetItem*)));

         setWindowTitle(tr("Spreadsheet"));
     }

     void SpreadSheet::createActions()
     {
         cell_sumAction = new QAction(tr("Sum"), this);
         connect(cell_sumAction, SIGNAL(triggered()), this, SLOT(actionSum()));

         cell_addAction = new QAction(tr("&Add"), this);
         cell_addAction->setShortcut(Qt::CTRL | Qt::Key_Plus);
         connect(cell_addAction, SIGNAL(triggered()), this, SLOT(actionAdd()));

         cell_subAction = new QAction(tr("&Subtract"), this);
         cell_subAction->setShortcut(Qt::CTRL | Qt::Key_Minus);
         connect(cell_subAction, SIGNAL(triggered()), this, SLOT(actionSubtract()));

         cell_mulAction = new QAction(tr("&Multiply"), this);
         cell_mulAction->setShortcut(Qt::CTRL | Qt::Key_multiply);
         connect(cell_mulAction, SIGNAL(triggered()), this, SLOT(actionMultiply()));

         cell_divAction = new QAction(tr("&Divide"), this);
         cell_divAction->setShortcut(Qt::CTRL | Qt::Key_division);
         connect(cell_divAction, SIGNAL(triggered()), this, SLOT(actionDivide()));

         fontAction = new QAction(tr("Font..."), this);
         fontAction->setShortcut(Qt::CTRL | Qt::Key_F);
         connect(fontAction, SIGNAL(triggered()), this, SLOT(selectFont()));

         colorAction = new QAction(QPixmap(16, 16), tr("Background &Color..."), this);
         connect(colorAction, SIGNAL(triggered()), this, SLOT(selectColor()));

         clearAction = new QAction(tr("Clear"), this);
         clearAction->setShortcut(Qt::Key_Delete);
         connect(clearAction, SIGNAL(triggered()), this, SLOT(clear()));

         aboutSpreadSheet = new QAction(tr("About Spreadsheet"), this);
         connect(aboutSpreadSheet, SIGNAL(triggered()), this, SLOT(showAbout()));

         exitAction = new QAction(tr("E&xit"), this);
         connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

         printAction = new QAction(tr("&Print"), this);
         connect(printAction, SIGNAL(triggered()), this, SLOT(print()));

         firstSeparator = new QAction(this);
         firstSeparator->setSeparator(true);

         secondSeparator = new QAction(this);
         secondSeparator->setSeparator(true);
     }

     void SpreadSheet::setupMenuBar()
     {
         QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
         fileMenu->addAction(printAction);
         fileMenu->addAction(exitAction);

         QMenu *cellMenu = menuBar()->addMenu(tr("&Cell"));
         cellMenu->addAction(cell_addAction);
         cellMenu->addAction(cell_subAction);
         cellMenu->addAction(cell_mulAction);
         cellMenu->addAction(cell_divAction);
         cellMenu->addAction(cell_sumAction);
         cellMenu->addSeparator();
         cellMenu->addAction(colorAction);
         cellMenu->addAction(fontAction);

         menuBar()->addSeparator();

         QMenu *aboutMenu = menuBar()->addMenu(tr("&Help"));
         aboutMenu->addAction(aboutSpreadSheet);
     }

     void SpreadSheet::updateStatus(QTableWidgetItem *item)
     {
         if (item && item == table->currentItem()) {
             statusBar()->showMessage(item->data(Qt::StatusTipRole).toString(),
                                      1000);
             cellLabel->setText(tr("Cell: (%1)").arg(encode_pos(table->row(item),
                                                                table->column(item))));
         }
     }

     void SpreadSheet::updateColor(QTableWidgetItem *item)
     {
         QPixmap pix(16, 16);
         QColor col;
         if (item)
             col = item->backgroundColor();
         if (!col.isValid())
             col = palette().base().color();

         QPainter pt(&pix);
         pt.fillRect(0, 0, 16, 16, col);

         QColor lighter = col.light();
         pt.setPen(lighter);
         QPoint lightFrame[] = { QPoint(0, 15), QPoint(0, 0), QPoint(15, 0) };
         pt.drawPolyline(lightFrame, 3);

         pt.setPen(col.dark());
         QPoint darkFrame[] = { QPoint(1, 15), QPoint(15, 15), QPoint(15, 1) };
         pt.drawPolyline(darkFrame, 3);

         pt.end();

         colorAction->setIcon(pix);
     }

     void SpreadSheet::updateLineEdit(QTableWidgetItem *item)
     {
         if (item != table->currentItem())
             return;
         if (item)
             formulaInput->setText(item->data(Qt::EditRole).toString());
         else
             formulaInput->clear();
     }

     void SpreadSheet::returnPressed()
     {
         QString text = formulaInput->text();
         int row = table->currentRow();
         int col = table->currentColumn();
         QTableWidgetItem *item = table->item(row, col);
         if (!item)
             table->setItem(row, col, new SpreadSheetItem(text));
         else
             item->setData(Qt::EditRole, text);
         table->viewport()->update();
     }

     void SpreadSheet::selectColor()
     {
         QTableWidgetItem *item = table->currentItem();
         QColor col = item ? item->backgroundColor() : table->palette().base().color();
         col = QColorDialog::getColor(col, this);
         if (!col.isValid())
             return;

         QList<QTableWidgetItem*> selected = table->selectedItems();
         if (selected.count() == 0)
             return;

         foreach(QTableWidgetItem *i, selected)
             if (i)
                 i->setBackgroundColor(col);

         updateColor(table->currentItem());
     }

     void SpreadSheet::selectFont()
     {
         QList<QTableWidgetItem*> selected = table->selectedItems();
         if (selected.count() == 0)
             return;

         bool ok = false;
         QFont fnt = QFontDialog::getFont(&ok, font(), this);

         if (!ok)
             return;
         foreach(QTableWidgetItem *i, selected)
             if (i)
                 i->setFont(fnt);
     }

     bool SpreadSheet::runInputDialog(const QString &title,
                                      const QString &c1Text,
                                      const QString &c2Text,
                                      const QString &opText,
                                      const QString &outText,
                                      QString *cell1, QString *cell2, QString *outCell)
     {
         QStringList rows, cols;
         for (int c = 0; c < table->columnCount(); ++c)
             cols << QChar('A' + c);
         for (int r = 0; r < table->rowCount(); ++r)
             rows << QString::number(1 + r);

         QDialog addDialog(this);
         addDialog.setWindowTitle(title);

         QGroupBox group(title, &addDialog);
         group.setMinimumSize(250, 100);

         QLabel cell1Label(c1Text, &group);
         QComboBox cell1RowInput(&group);
         int c1Row, c1Col;
         decode_pos(*cell1, &c1Row, &c1Col);
         cell1RowInput.addItems(rows);
         cell1RowInput.setCurrentIndex(c1Row);

         QComboBox cell1ColInput(&group);
         cell1ColInput.addItems(cols);
         cell1ColInput.setCurrentIndex(c1Col);

         QLabel operatorLabel(opText, &group);
         operatorLabel.setAlignment(Qt::AlignHCenter);

         QLabel cell2Label(c2Text, &group);
         QComboBox cell2RowInput(&group);
         int c2Row, c2Col;
         decode_pos(*cell2, &c2Row, &c2Col);
         cell2RowInput.addItems(rows);
         cell2RowInput.setCurrentIndex(c2Row);
         QComboBox cell2ColInput(&group);
         cell2ColInput.addItems(cols);
         cell2ColInput.setCurrentIndex(c2Col);

         QLabel equalsLabel("=", &group);
         equalsLabel.setAlignment(Qt::AlignHCenter);

         QLabel outLabel(outText, &group);
         QComboBox outRowInput(&group);
         int outRow, outCol;
         decode_pos(*outCell, &outRow, &outCol);
         outRowInput.addItems(rows);
         outRowInput.setCurrentIndex(outRow);
         QComboBox outColInput(&group);
         outColInput.addItems(cols);
         outColInput.setCurrentIndex(outCol);

         QPushButton cancelButton(tr("Cancel"), &addDialog);
         connect(&cancelButton, SIGNAL(clicked()), &addDialog, SLOT(reject()));

         QPushButton okButton(tr("OK"), &addDialog);
         okButton.setDefault(true);
         connect(&okButton, SIGNAL(clicked()), &addDialog, SLOT(accept()));

         QHBoxLayout *buttonsLayout = new QHBoxLayout;
         buttonsLayout->addStretch(1);
         buttonsLayout->addWidget(&okButton);
         buttonsLayout->addSpacing(10);
         buttonsLayout->addWidget(&cancelButton);

         QVBoxLayout *dialogLayout = new QVBoxLayout(&addDialog);
         dialogLayout->addWidget(&group);
         dialogLayout->addStretch(1);
         dialogLayout->addItem(buttonsLayout);

         QHBoxLayout *cell1Layout = new QHBoxLayout;
         cell1Layout->addWidget(&cell1Label);
         cell1Layout->addSpacing(10);
         cell1Layout->addWidget(&cell1ColInput);
         cell1Layout->addSpacing(10);
         cell1Layout->addWidget(&cell1RowInput);

         QHBoxLayout *cell2Layout = new QHBoxLayout;
         cell2Layout->addWidget(&cell2Label);
         cell2Layout->addSpacing(10);
         cell2Layout->addWidget(&cell2ColInput);
         cell2Layout->addSpacing(10);
         cell2Layout->addWidget(&cell2RowInput);

         QHBoxLayout *outLayout = new QHBoxLayout;
         outLayout->addWidget(&outLabel);
         outLayout->addSpacing(10);
         outLayout->addWidget(&outColInput);
         outLayout->addSpacing(10);
         outLayout->addWidget(&outRowInput);

         QVBoxLayout *vLayout = new QVBoxLayout(&group);
         vLayout->addItem(cell1Layout);
         vLayout->addWidget(&operatorLabel);
         vLayout->addItem(cell2Layout);
         vLayout->addWidget(&equalsLabel);
         vLayout->addStretch(1);
         vLayout->addItem(outLayout);

         if (addDialog.exec()) {
             *cell1 = cell1ColInput.currentText() + cell1RowInput.currentText();
             *cell2 = cell2ColInput.currentText() + cell2RowInput.currentText();
             *outCell = outColInput.currentText() + outRowInput.currentText();
             return true;
         }

         return false;
     }

     void SpreadSheet::actionSum()
     {
         int row_first = 0;
         int row_last = 0;
         int row_cur = 0;

         int col_first = 0;
         int col_last = 0;
         int col_cur = 0;

         QList<QTableWidgetItem*> selected = table->selectedItems();

         if (!selected.isEmpty()) {
             QTableWidgetItem *first = selected.first();
             QTableWidgetItem *last = selected.last();
             row_first = table->row(first);
             row_last = table->row(last);
             col_first = table->column(first);
             col_last = table->column(last);
         }

         QTableWidgetItem *current = table->currentItem();

         if (current) {
             row_cur = table->row(current);
             col_cur = table->column(current);
         }

         QString cell1 = encode_pos(row_first, col_first);
         QString cell2 = encode_pos(row_last, col_last);
         QString out = encode_pos(row_cur, col_cur);

         if (runInputDialog(tr("Sum cells"), tr("First cell:"), tr("Last cell:"),
                            QString("%1").arg(QChar(0x03a3)), tr("Output to:"),
                            &cell1, &cell2, &out)) {
             int row, col;
             decode_pos(out, &row, &col);
             table->item(row, col)->setText(tr("sum %1 %2").arg(cell1, cell2));
         }
     }

     void SpreadSheet::actionMath_helper(const QString &title, const QString &op)
     {
         QString cell1 = "C1";
         QString cell2 = "C2";
         QString out = "C3";

         QTableWidgetItem *current = table->currentItem();
         if (current)
             out = encode_pos(table->currentRow(), table->currentColumn());

         if (runInputDialog(title, tr("Cell 1"), tr("Cell 2"), op, tr("Output to:"),
                            &cell1, &cell2, &out)) {
             int row, col;
             decode_pos(out, &row, &col);
             table->item(row, col)->setText(tr("%1 %2 %3").arg(op, cell1, cell2));
         }
     }

     void SpreadSheet::actionAdd()
     {
         actionMath_helper(tr("Addition"), "+");
     }

     void SpreadSheet::actionSubtract()
     {
         actionMath_helper(tr("Subtraction"), "-");
     }

     void SpreadSheet::actionMultiply()
     {
         actionMath_helper(tr("Multiplication"), "*");
     }
     void SpreadSheet::actionDivide()
     {
         actionMath_helper(tr("Division"), "/");
     }

     void SpreadSheet::clear()
     {
         foreach (QTableWidgetItem *i, table->selectedItems())
             i->setText("");
     }

     void SpreadSheet::setupContextMenu()
     {
         addAction(cell_addAction);
         addAction(cell_subAction);
         addAction(cell_mulAction);
         addAction(cell_divAction);
         addAction(cell_sumAction);
         addAction(firstSeparator);
         addAction(colorAction);
         addAction(fontAction);
         addAction(secondSeparator);
         addAction(clearAction);
         setContextMenuPolicy(Qt::ActionsContextMenu);
     }

     void SpreadSheet::setupContents()
     {
         QColor titleBackground(Qt::lightGray);
         QFont titleFont = table->font();
         titleFont.setBold(true);

         // column 0
         table->setItem(0, 0, new SpreadSheetItem("Item"));
         table->item(0, 0)->setBackgroundColor(titleBackground);
         table->item(0, 0)->setToolTip("This column shows the purchased item/service");
         table->item(0, 0)->setFont(titleFont);

         table->setItem(1, 0, new SpreadSheetItem("AirportBus"));
         table->setItem(2, 0, new SpreadSheetItem("Flight (Munich)"));
         table->setItem(3, 0, new SpreadSheetItem("Lunch"));
         table->setItem(4, 0, new SpreadSheetItem("Flight (LA)"));
         table->setItem(5, 0, new SpreadSheetItem("Taxi"));
         table->setItem(6, 0, new SpreadSheetItem("Dinner"));
         table->setItem(7, 0, new SpreadSheetItem("Hotel"));
         table->setItem(8, 0, new SpreadSheetItem("Flight (Oslo)"));
         table->setItem(9, 0, new SpreadSheetItem("Total:"));

         table->item(9, 0)->setFont(titleFont);
         table->item(9, 0)->setBackgroundColor(Qt::lightGray);

         // column 1
         table->setItem(0, 1, new SpreadSheetItem("Date"));
         table->item(0, 1)->setBackgroundColor(titleBackground);
         table->item(0, 1)->setToolTip("This column shows the purchase date, double click to change");
         table->item(0, 1)->setFont(titleFont);

         table->setItem(1, 1, new SpreadSheetItem("15/6/2006"));
         table->setItem(2, 1, new SpreadSheetItem("15/6/2006"));
         table->setItem(3, 1, new SpreadSheetItem("15/6/2006"));
         table->setItem(4, 1, new SpreadSheetItem("21/5/2006"));
         table->setItem(5, 1, new SpreadSheetItem("16/6/2006"));
         table->setItem(6, 1, new SpreadSheetItem("16/6/2006"));
         table->setItem(7, 1, new SpreadSheetItem("16/6/2006"));
         table->setItem(8, 1, new SpreadSheetItem("18/6/2006"));

         table->setItem(9, 1, new SpreadSheetItem());
         table->item(9, 1)->setBackgroundColor(Qt::lightGray);

         // column 2
         table->setItem(0, 2, new SpreadSheetItem("Price"));
         table->item(0, 2)->setBackgroundColor(titleBackground);
         table->item(0, 2)->setToolTip("This collumn shows the price of the purchase");
         table->item(0, 2)->setFont(titleFont);

         table->setItem(1, 2, new SpreadSheetItem("150"));
         table->setItem(2, 2, new SpreadSheetItem("2350"));
         table->setItem(3, 2, new SpreadSheetItem("-14"));
         table->setItem(4, 2, new SpreadSheetItem("980"));
         table->setItem(5, 2, new SpreadSheetItem("5"));
         table->setItem(6, 2, new SpreadSheetItem("120"));
         table->setItem(7, 2, new SpreadSheetItem("300"));
         table->setItem(8, 2, new SpreadSheetItem("1240"));

         table->setItem(9, 2, new SpreadSheetItem());
         table->item(9, 2)->setBackgroundColor(Qt::lightGray);

         // column 3
         table->setItem(0, 3, new SpreadSheetItem("Currency"));
         table->item(0, 3)->setBackgroundColor(titleBackground);
         table->item(0, 3)->setToolTip("This column shows the currency");
         table->item(0, 3)->setFont(titleFont);

         table->setItem(1, 3, new SpreadSheetItem("NOK"));
         table->setItem(2, 3, new SpreadSheetItem("NOK"));
         table->setItem(3, 3, new SpreadSheetItem("EUR"));
         table->setItem(4, 3, new SpreadSheetItem("EUR"));
         table->setItem(5, 3, new SpreadSheetItem("USD"));
         table->setItem(6, 3, new SpreadSheetItem("USD"));
         table->setItem(7, 3, new SpreadSheetItem("USD"));
         table->setItem(8, 3, new SpreadSheetItem("USD"));

         table->setItem(9, 3, new SpreadSheetItem());
         table->item(9,3)->setBackgroundColor(Qt::lightGray);

         // column 4
         table->setItem(0, 4, new SpreadSheetItem("Ex. Rate"));
         table->item(0, 4)->setBackgroundColor(titleBackground);
         table->item(0, 4)->setToolTip("This column shows the exchange rate to NOK");
         table->item(0, 4)->setFont(titleFont);

         table->setItem(1, 4, new SpreadSheetItem("1"));
         table->setItem(2, 4, new SpreadSheetItem("1"));
         table->setItem(3, 4, new SpreadSheetItem("8"));
         table->setItem(4, 4, new SpreadSheetItem("8"));
         table->setItem(5, 4, new SpreadSheetItem("7"));
         table->setItem(6, 4, new SpreadSheetItem("7"));
         table->setItem(7, 4, new SpreadSheetItem("7"));
         table->setItem(8, 4, new SpreadSheetItem("7"));

         table->setItem(9, 4, new SpreadSheetItem());
         table->item(9,4)->setBackgroundColor(Qt::lightGray);

         // column 5
         table->setItem(0, 5, new SpreadSheetItem("NOK"));
         table->item(0, 5)->setBackgroundColor(titleBackground);
         table->item(0, 5)->setToolTip("This column shows the expenses in NOK");
         table->item(0, 5)->setFont(titleFont);

         table->setItem(1, 5, new SpreadSheetItem("* C2 E2"));
         table->setItem(2, 5, new SpreadSheetItem("* C3 E3"));
         table->setItem(3, 5, new SpreadSheetItem("* C4 E4"));
         table->setItem(4, 5, new SpreadSheetItem("* C5 E5"));
         table->setItem(5, 5, new SpreadSheetItem("* C6 E6"));
         table->setItem(6, 5, new SpreadSheetItem("* C7 E7"));
         table->setItem(7, 5, new SpreadSheetItem("* C8 E8"));
         table->setItem(8, 5, new SpreadSheetItem("* C9 E9"));

         table->setItem(9, 5, new SpreadSheetItem("sum F2 F9"));
         table->item(9,5)->setBackgroundColor(Qt::lightGray);
     }

     const char *htmlText =
     "<HTML>"
     "<p><b>This demo shows use of <c>QTableWidget</c> with custom handling for"
     " individual cells.</b></p>"
     "<p>Using a customized table item we make it possible to have dynamic"
     " output in different cells. The content that is implemented for this"
     " particular demo is:"
     "<ul>"
     "<li>Adding two cells.</li>"
     "<li>Subtracting one cell from another.</li>"
     "<li>Multiplying two cells.</li>"
     "<li>Dividing one cell with another.</li>"
     "<li>Summing the contents of an arbitrary number of cells.</li>"
     "</HTML>";

     void SpreadSheet::showAbout()
     {
         QMessageBox::about(this, "About Spreadsheet", htmlText);
     }

     void decode_pos(const QString &pos, int *row, int *col)
     {
         if (pos.isEmpty()) {
             *col = -1;
             *row = -1;
         } else {
             *col = pos.at(0).toLatin1() - 'A';
             *row = pos.right(pos.size() - 1).toInt() - 1;
         }
     }

     QString encode_pos(int row, int col)
     {
         return QString(col + 'A') + QString::number(row + 1);
     }

     void SpreadSheet::print()
     {
     #ifndef QT_NO_PRINTER
         QPrinter printer(QPrinter::ScreenResolution);
         QPrintPreviewDialog dlg(&printer);
         PrintView view;
         view.setModel(table->model());
         connect(&dlg, SIGNAL(paintRequested(QPrinter*)),
                 &view, SLOT(print(QPrinter*)));
         dlg.exec();
     #endif
     }