mainwindow.cpp

这个是qt3c++编程书(齐亮翻译),里面3,4章代码

bool MainWindow::save()
{
    if (curFile.isEmpty()) {
        return saveAs();
    } else {
        saveFile(curFile);
        return true;
    }
}

void MainWindow::saveFile(const QString &fileName)
{
    if (spreadsheet->writeFile(fileName)) {
        setCurrentFile(fileName);
        statusBar()->message(tr("File saved"), 2000);
    } else {
        statusBar()->message(tr("Saving canceled"), 2000);
    }
}

bool MainWindow::saveAs()
{
    QString fileName =
            QFileDialog::getSaveFileName(".", fileFilters, this);
    if (fileName.isEmpty())
        return false;

    if (QFile::exists(fileName)) {
        int ret = QMessageBox::warning(this, tr("Spreadsheet"),
                     tr("File %1 already exists.\n"
                        "Do you want to overwrite it?")
                     .arg(QDir::convertSeparators(fileName)),
                     QMessageBox::Yes | QMessageBox::Default,
                     QMessageBox::No | QMessageBox::Escape);
        if (ret == QMessageBox::No)
            return true;
    }
    if (!fileName.isEmpty())
        saveFile(fileName);
    return true;
}

void MainWindow::closeEvent(QCloseEvent *event)
{
    if (maybeSave()) {
        writeSettings();
        event->accept();
    } else {
        event->ignore();
    }
}

bool MainWindow::maybeSave()
{
    if (modified) {
        int ret = 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 (ret == QMessageBox::Yes)
            return save();
        else if (ret == QMessageBox::Cancel)
            return false;
    }
    return true;
}

void MainWindow::setCurrentFile(const QString &fileName)
{
    curFile = fileName;
    modLabel->clear();
    modified = false;

    if (curFile.isEmpty()) {
        setCaption(tr("Spreadsheet"));
    } else {
        setCaption(tr("%1 - %2").arg(strippedName(curFile))
                                .arg(tr("Spreadsheet")));
        recentFiles.remove(curFile);
        recentFiles.push_front(curFile);
        updateRecentFileItems();
    }
}

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

void MainWindow::updateRecentFileItems()
{
    while ((int)recentFiles.size() > MaxRecentFiles)
        recentFiles.pop_back();

    for (int i = 0; i < (int)recentFiles.size(); ++i) {
        QString text = tr("&%1 %2")
                       .arg(i + 1)
                       .arg(strippedName(recentFiles[i]));
        if (recentFileIds[i] == -1) {
            if (i == 0)
                fileMenu->insertSeparator(fileMenu->count() - 2);
            recentFileIds[i] =
                    fileMenu->insertItem(text, this,
                                         SLOT(openRecentFile(int)),
                                         0, -1,
                                         fileMenu->count() - 2);
            fileMenu->setItemParameter(recentFileIds[i], i);
        } else {
            fileMenu->changeItem(recentFileIds[i], text);
        }
    }
}

void MainWindow::openRecentFile(int param)
{
    if (maybeSave())
        loadFile(recentFiles[param]);
}

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

    formulaLabel = new QLabel(this);

    modLabel = new QLabel(tr(" MOD "), this);
    modLabel->setAlignment(AlignHCenter);
    modLabel->setMinimumSize(modLabel->sizeHint());
    modLabel->clear();

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

    connect(spreadsheet, SIGNAL(currentChanged(int, int)),
            this, SLOT(updateCellIndicators()));
    connect(spreadsheet, SIGNAL(modified()),
            this, SLOT(spreadsheetModified()));

    updateCellIndicators();
}

void MainWindow::updateCellIndicators()
{
    locationLabel->setText(spreadsheet->currentLocation());
    formulaLabel->setText(" " + spreadsheet->currentFormula());
}

void MainWindow::spreadsheetModified()
{
    modLabel->setText(tr("MOD"));
    modified = true;
    updateCellIndicators();
}

void MainWindow::find()
{
    if (!findDialog) {
        findDialog = new FindDialog(this);
        connect(findDialog, SIGNAL(findNext(const QString &, bool)),
                spreadsheet, SLOT(findNext(const QString &, bool)));
        connect(findDialog, SIGNAL(findPrev(const QString &, bool)),
                spreadsheet, SLOT(findPrev(const QString &, bool)));
    }

    findDialog->show();
    findDialog->raise();
    findDialog->setActiveWindow();
}

void MainWindow::goToCell()
{
    GoToCellDialog dialog(this);
    if (dialog.exec()) {
        QString str = dialog.lineEdit->text();
        spreadsheet->setCurrentCell(str.mid(1).toInt() - 1,
                                    str[0].upper().unicode() - 'A');
    }
}

void MainWindow::sort()
{
    SortDialog dialog(this);
    QTableSelection sel = spreadsheet->selection();
    dialog.setColumnRange('A' + sel.leftCol(), 'A' + sel.rightCol());

    if (dialog.exec()) {
        SpreadsheetCompare compare;
        compare.keys[0] =
              dialog.primaryColumnCombo->currentItem();
        compare.keys[1] =
              dialog.secondaryColumnCombo->currentItem() - 1;
        compare.keys[2] =
              dialog.tertiaryColumnCombo->currentItem() - 1;
        compare.ascending[0] =
              (dialog.primaryOrderCombo->currentItem() == 0);
        compare.ascending[1] =
              (dialog.secondaryOrderCombo->currentItem() == 0);
        compare.ascending[2] =
              (dialog.tertiaryOrderCombo->currentItem() == 0);
        spreadsheet->sort(compare);
    }
}

void MainWindow::about()
{
    QMessageBox::about(this, tr("About Spreadsheet"),
            tr("<h2>Spreadsheet 1.0</h2>"
               "<p>Copyright &copy; 2003 Software Inc."
               "<p>Spreadsheet is a small application that "
               "demonstrates <b>QAction</b>, <b>QMainWindow</b>, "
               "<b>QMenuBar</b>, <b>QStatusBar</b>, "
               "<b>QToolBar</b>, and many other Qt classes."));
}

void MainWindow::writeSettings()
{
    QSettings settings;
    settings.setPath("software-inc.com", "Spreadsheet");
    settings.beginGroup("/Spreadsheet");
    settings.writeEntry("/geometry/x", x());
    settings.writeEntry("/geometry/y", y());
    settings.writeEntry("/geometry/width", width());
    settings.writeEntry("/geometry/height", height());
    settings.writeEntry("/recentFiles", recentFiles);
    settings.writeEntry("/showGrid", showGridAct->isOn());
    settings.writeEntry("/autoRecalc", showGridAct->isOn());
    settings.endGroup();
}

void MainWindow::readSettings()
{
    QSettings settings;
    settings.setPath("software-inc.com", "Spreadsheet");
    settings.beginGroup("/Spreadsheet");

    int x = settings.readNumEntry("/geometry/x", 200);
    int y = settings.readNumEntry("/geometry/y", 200);
    int w = settings.readNumEntry("/geometry/width", 400);
    int h = settings.readNumEntry("/geometry/height", 400);
    move(x, y);
    resize(w, h);

    recentFiles = settings.readListEntry("/recentFiles");
    updateRecentFileItems();

    showGridAct->setOn(
            settings.readBoolEntry("/showGrid", true));
    autoRecalcAct->setOn(
            settings.readBoolEntry("/autoRecalc", true));

    settings.endGroup();
}