Long live Qt!

1 files changed, 631 insertions, 0 deletions

diff --git a/demos/spreadsheet/spreadsheet.cpp b/demos/spreadsheet/spreadsheet.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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("Diinner"));
+    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());
+
+    // 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
+}
+