mainwindow.cpp

C++ GUI Programming with Qt 4一书中的chap03源码

    goToCellAction = new QAction(tr("&Go to Cell..."), this);
    goToCellAction->setIcon(QIcon(":/images/gotocell.png"));
    goToCellAction->setShortcut(tr("F5"));
    goToCellAction->setStatusTip(tr("Go to the specified cell"));
    connect(goToCellAction, SIGNAL(triggered()),
            this, SLOT(goToCell()));

    recalculateAction = new QAction(tr("&Recalculate"), this);
    recalculateAction->setShortcut(tr("F9"));
    recalculateAction->setStatusTip(tr("Recalculate all the "
                                       "spreadsheet's formulas"));
    connect(recalculateAction, SIGNAL(triggered()),
            spreadsheet, SLOT(recalculate()));

    sortAction = new QAction(tr("&Sort..."), this);
    sortAction->setStatusTip(tr("Sort the selected cells or all the "
                                "cells"));
    connect(sortAction, SIGNAL(triggered()), this, SLOT(sort()));

    showGridAction = new QAction(tr("&Show Grid"), this);
    showGridAction->setCheckable(true);
    showGridAction->setChecked(spreadsheet->showGrid());
    showGridAction->setStatusTip(tr("Show or hide the spreadsheet's "
                                    "grid"));
    connect(showGridAction, SIGNAL(toggled(bool)),
            spreadsheet, SLOT(setShowGrid(bool)));
#if QT_VERSION < 0x040102
    // workaround for a QTableWidget bug in Qt 4.1.1
    connect(showGridAction, SIGNAL(toggled(bool)),
            spreadsheet->viewport(), SLOT(update()));
#endif

    autoRecalcAction = new QAction(tr("&Auto-Recalculate"), this);
    autoRecalcAction->setCheckable(true);
    autoRecalcAction->setChecked(spreadsheet->autoRecalculate());
    autoRecalcAction->setStatusTip(tr("Switch auto-recalculation on or "
                                      "off"));
    connect(autoRecalcAction, SIGNAL(toggled(bool)),
            spreadsheet, SLOT(setAutoRecalculate(bool)));

    aboutAction = new QAction(tr("&About"), this);
    aboutAction->setStatusTip(tr("Show the application's About box"));
    connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));

    aboutQtAction = new QAction(tr("About &Qt"), this);
    aboutQtAction->setStatusTip(tr("Show the Qt library's About box"));
    connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
}

void MainWindow::createMenus()
{
    fileMenu = menuBar()->addMenu(tr("&File"));
    fileMenu->addAction(newAction);
    fileMenu->addAction(openAction);
    fileMenu->addAction(saveAction);
    fileMenu->addAction(saveAsAction);
    separatorAction = fileMenu->addSeparator();
    for (int i = 0; i < MaxRecentFiles; ++i)
        fileMenu->addAction(recentFileActions[i]);
    fileMenu->addSeparator();
    fileMenu->addAction(exitAction);

    editMenu = menuBar()->addMenu(tr("&Edit"));
    editMenu->addAction(cutAction);
    editMenu->addAction(copyAction);
    editMenu->addAction(pasteAction);
    editMenu->addAction(deleteAction);

    selectSubMenu = editMenu->addMenu(tr("&Select"));
    selectSubMenu->addAction(selectRowAction);
    selectSubMenu->addAction(selectColumnAction);
    selectSubMenu->addAction(selectAllAction);

    editMenu->addSeparator();
    editMenu->addAction(findAction);
    editMenu->addAction(goToCellAction);

    toolsMenu = menuBar()->addMenu(tr("&Tools"));
    toolsMenu->addAction(recalculateAction);
    toolsMenu->addAction(sortAction);

    optionsMenu = menuBar()->addMenu(tr("&Options"));
    optionsMenu->addAction(showGridAction);
    optionsMenu->addAction(autoRecalcAction);

    menuBar()->addSeparator();

    helpMenu = menuBar()->addMenu(tr("&Help"));
    helpMenu->addAction(aboutAction);
    helpMenu->addAction(aboutQtAction);
}

void MainWindow::createContextMenu()
{
    spreadsheet->addAction(cutAction);
    spreadsheet->addAction(copyAction);
    spreadsheet->addAction(pasteAction);
    spreadsheet->setContextMenuPolicy(Qt::ActionsContextMenu);
}

void MainWindow::createToolBars()
{
    fileToolBar = addToolBar(tr("&File"));
    fileToolBar->addAction(newAction);
    fileToolBar->addAction(openAction);
    fileToolBar->addAction(saveAction);

    editToolBar = addToolBar(tr("&Edit"));
    editToolBar->addAction(cutAction);
    editToolBar->addAction(copyAction);
    editToolBar->addAction(pasteAction);
    editToolBar->addSeparator();
    editToolBar->addAction(findAction);
    editToolBar->addAction(goToCellAction);
}

void MainWindow::createStatusBar()
{
    locationLabel = new QLabel(" W999 ");
    locationLabel->setAlignment(Qt::AlignHCenter);
    locationLabel->setMinimumSize(locationLabel->sizeHint());

    formulaLabel = new QLabel;
    formulaLabel->setIndent(3);

    statusBar()->addWidget(locationLabel);
    statusBar()->addWidget(formulaLabel, 1);

    connect(spreadsheet, SIGNAL(currentCellChanged(int, int, int, int)),
            this, SLOT(updateStatusBar()));
    connect(spreadsheet, SIGNAL(modified()),
            this, SLOT(spreadsheetModified()));

    updateStatusBar();
}

void MainWindow::readSettings()
{
    QSettings settings("Software Inc.", "Spreadsheet");

    QRect rect = settings.value("geometry",
                                QRect(200, 200, 400, 400)).toRect();
    move(rect.topLeft());
    resize(rect.size());

    recentFiles = settings.value("recentFiles").toStringList();
    updateRecentFileActions();

    bool showGrid = settings.value("showGrid", true).toBool();
    showGridAction->setChecked(showGrid);

    bool autoRecalc = settings.value("autoRecalc", true).toBool();
    autoRecalcAction->setChecked(autoRecalc);
}

void MainWindow::writeSettings()
{
    QSettings settings("Software Inc.", "Spreadsheet");

    settings.setValue("geometry", geometry());
    settings.setValue("recentFiles", recentFiles);
    settings.setValue("showGrid", showGridAction->isChecked());
    settings.setValue("autoRecalc", autoRecalcAction->isChecked());
}

bool MainWindow::okToContinue()
{
    if (isWindowModified()) {
        int r = QMessageBox::warning(this, tr("Spreadsheet"),
                        tr("The document has been modified.\n"
                           "Do you want to save your changes?"),
                        QMessageBox::Yes | QMessageBox::Default,
                        QMessageBox::No,
                        QMessageBox::Cancel | QMessageBox::Escape);
        if (r == QMessageBox::Yes) {
            return save();
        } else if (r == QMessageBox::Cancel) {
            return false;
        }
    }
    return true;
}

bool MainWindow::loadFile(const QString &fileName)
{
    if (!spreadsheet->readFile(fileName)) {
        statusBar()->showMessage(tr("Loading canceled"), 2000);
        return false;
    }

    setCurrentFile(fileName);
    statusBar()->showMessage(tr("File loaded"), 2000);
    return true;
}

bool MainWindow::saveFile(const QString &fileName)
{
    if (!spreadsheet->writeFile(fileName)) {
        statusBar()->showMessage(tr("Saving canceled"), 2000);
        return false;
    }

    setCurrentFile(fileName);
    statusBar()->showMessage(tr("File saved"), 2000);
    return true;
}

void MainWindow::setCurrentFile(const QString &fileName)
{
    curFile = fileName;
    setWindowModified(false);

    QString shownName = "Untitled";
    if (!curFile.isEmpty()) {
        shownName = strippedName(curFile);
        recentFiles.removeAll(curFile);
        recentFiles.prepend(curFile);
        updateRecentFileActions();
    }

    setWindowTitle(tr("%1[*] - %2").arg(shownName)
                                   .arg(tr("Spreadsheet")));
}

void MainWindow::updateRecentFileActions()
{
    QMutableStringListIterator i(recentFiles);
    while (i.hasNext()) {
        if (!QFile::exists(i.next()))
            i.remove();
    }

    for (int j = 0; j < MaxRecentFiles; ++j) {
        if (j < recentFiles.count()) {
            QString text = tr("&%1 %2")
                           .arg(j + 1)
                           .arg(strippedName(recentFiles[j]));
            recentFileActions[j]->setText(text);
            recentFileActions[j]->setData(recentFiles[j]);
            recentFileActions[j]->setVisible(true);
        } else {
            recentFileActions[j]->setVisible(false);
        }
    }
    separatorAction->setVisible(!recentFiles.isEmpty());
}

QString MainWindow::strippedName(const QString &fullFileName)
{
    return QFileInfo(fullFileName).fileName();
}