mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    spreadsheet = new Spreadsheet;
    setCentralWidget(spreadsheet);

    createActions();
    createMenus();
    createContextMenu();
    createToolBars();
    createStatusBar();

    readSettings();

    findDialog = 0;

    setWindowIcon(QIcon(":/images/icon.png"));
    setCurrentFile("");
}

MainWindow::~MainWindow()
{
    delete ui;
}


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

void MainWindow::newFile()
{
    if (okToContinue()) {
        spreadsheet->clear();
        setCurrentFile("");
    }
}

void MainWindow::open()
{
    if (okToContinue()) {
        QString fileName = QFileDialog::getOpenFileName(this,
                                                        tr("Open spreadsheet"), ".",
                                                        tr("Spreadsheet files (*.sp)"));
        if (!fileName.isEmpty())
            loadFile(fileName);
    }
}

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

bool MainWindow::saveAs()
{
    QString fileName = QFileDialog::getSaveFileName(this,
                                                    tr("Save Spreadsheet"), ".",
                                                    tr("Spreadsheet file (*.sp)"));
    if (fileName.isEmpty())
        return false;

    return saveFile(fileName);
}

void MainWindow::find()
{
    if (!findDialog) {
        findDialog = new FindDialog(this);
        connect(findDialog, SIGNAL(findNext(const QString &,
                                            Qt::CaseSensitivity)),
                spreadsheet, SLOT(findNext(const QString &,
                                           Qt::CaseSensitivity)));
        connect(findDialog, SIGNAL(findPrevious(const QString &,
                                                Qt::CaseSensitivity)),
                spreadsheet, SLOT(findPrevious(const QString &,
                                               Qt::CaseSensitivity)));
    }
    findDialog->show();
    findDialog->raise();
    findDialog->activateWindow();
}

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

void MainWindow::sort()
{
    SortDialog dialog(this);
    QTableWidgetSelectionRange range = spreadsheet->selectedRange();
    //选定的列('A' + 1, 'A' + 4 ==> 'B','E')
    dialog.setColumnRange('A' + range.leftColumn(),
                          'A' + range.rightColumn());

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

void MainWindow::about()
{
    QMessageBox::about(this, tr("About Spreadsheet"),
            tr("<h2>Spreadsheet 1.1</h2>"
               "<p>Copyright &copy; 2008 Software Inc."
               "<p>Spreadsheet is a small application that "
               "demonstrates QAction, QMainWindow, QMenuBar, "
               "QStatusBar, QTableWidget, QToolBar, and many other "
               "Qt classes."));
}

void MainWindow::openRecentFile()
{
    if (okToContinue()) {
        //qobject_cast动态类型转换--->这里sender()的含义是什么？
        QAction *action = qobject_cast<QAction *>(sender());
        //通过action->data()得到文件名
        if (action)
            loadFile(action->data().toString());
    }
}

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

void MainWindow::spreadsheetModified()
{
    setWindowModified(true);
    updateStatusBar();
}

//一个动作(action)就是一个可以添加到任意数量的菜单和工具栏上的项
void MainWindow::createActions()
{
    //New动作
    newAction = new QAction(tr("&New"), this);
    newAction->setIcon(QIcon(":/images/new.png"));
    newAction->setShortcut(QKeySequence::New);	//快捷键
    newAction->setStatusTip(tr("Create a new spreadsheet file"));
    connect(newAction, SIGNAL(triggered()), this, SLOT(newFile()));

    //Open动作
    openAction = new QAction(tr("&Open..."), this);
    openAction->setIcon(QIcon(":/images/open.png"));
    openAction->setShortcut(QKeySequence::Open);
    openAction->setStatusTip(tr("Open an existing spreadsheet file"));
    connect(openAction, SIGNAL(triggered()), this, SLOT(open()));

    //Save动作
    saveAction = new QAction(tr("&Save"), this);
    saveAction->setIcon(QIcon(":/images/save.png"));
    saveAction->setShortcut(QKeySequence::Save);
    saveAction->setStatusTip(tr("Save the spreadsheet to disk"));
    connect(saveAction, SIGNAL(triggered()), this, SLOT(save()));

    //Save as动作
    saveAsAction = new QAction(tr("Save &As..."), this);
    saveAsAction->setStatusTip(tr("Save the spreadsheet under a new "
                                  "name"));
    connect(saveAsAction, SIGNAL(triggered()), this, SLOT(saveAs()));

    //最近打开文件动作
    for (int i = 0; i < MaxRecentFiles; ++i) {
        recentFileActions[i] = new QAction(this);
        recentFileActions[i]->setVisible(false);
        connect(recentFileActions[i], SIGNAL(triggered()),
                this, SLOT(openRecentFile()));
    }

    //Exit动作
    exitAction = new QAction(tr("E&xit"), this);
    exitAction->setShortcut(tr("Ctrl+Q"));
    exitAction->setStatusTip(tr("Exit the application"));
    //这里close由Qt提供
    connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));

    //Cut动作
    cutAction = new QAction(tr("Cu&t"), this);
    cutAction->setIcon(QIcon(":/images/cut.png"));
    cutAction->setShortcut(QKeySequence::Cut);
    cutAction->setStatusTip(tr("Cut the current selection's contents "
                               "to the clipboard"));
    connect(cutAction, SIGNAL(triggered()), spreadsheet, SLOT(cut()));

    //Copy动作
    copyAction = new QAction(tr("&Copy"), this);
    copyAction->setIcon(QIcon(":/images/copy.png"));
    copyAction->setShortcut(QKeySequence::Copy);
    copyAction->setStatusTip(tr("Copy the current selection's contents "
                                "to the clipboard"));
    connect(copyAction, SIGNAL(triggered()), spreadsheet, SLOT(copy()));

    //Paste动作
    pasteAction = new QAction(tr("&Paste"), this);
    pasteAction->setIcon(QIcon(":/images/paste.png"));
    pasteAction->setShortcut(QKeySequence::Paste);
    pasteAction->setStatusTip(tr("Paste the clipboard's contents into "
                                 "the current selection"));
    connect(pasteAction, SIGNAL(triggered()),
            spreadsheet, SLOT(paste()));

    //Delete动作
    deleteAction = new QAction(tr("&Delete"), this);
    deleteAction->setShortcut(QKeySequence::Delete);
    deleteAction->setStatusTip(tr("Delete the current selection's "
                                  "contents"));
    connect(deleteAction, SIGNAL(triggered()),
            spreadsheet, SLOT(del()));

    selectRowAction = new QAction(tr("&Row"), this);
    selectRowAction->setStatusTip(tr("Select all the cells in the "
                                     "current row"));
    connect(selectRowAction, SIGNAL(triggered()),
            spreadsheet, SLOT(selectCurrentRow()));

    selectColumnAction = new QAction(tr("&Column"), this);
    selectColumnAction->setStatusTip(tr("Select all the cells in the "
                                        "current column"));
    connect(selectColumnAction, SIGNAL(triggered()),
            spreadsheet, SLOT(selectCurrentColumn()));

    selectAllAction = new QAction(tr("&All"), this);
    selectAllAction->setShortcut(QKeySequence::SelectAll);
    selectAllAction->setStatusTip(tr("Select all the cells in the "
                                     "spreadsheet"));
    //selectAll由父类QTableWidget实现
    connect(selectAllAction, SIGNAL(triggered()),
            spreadsheet, SLOT(selectAll()));

    findAction = new QAction(tr("&Find..."), this);
    findAction->setIcon(QIcon(":/images/find.png"));
    findAction->setShortcut(QKeySequence::Find);
    findAction->setStatusTip(tr("Find a matching cell"));
    connect(findAction, SIGNAL(triggered()), this, SLOT(find()));

    goToCellAction = new QAction(tr("&Go to Cell..."), this);
    goToCellAction->setIcon(QIcon(":/images/gotocell.png"));
    goToCellAction->setShortcut(tr("Ctrl+G"));
    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);	//复选动作
    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()
{
    //addMenu用于创建一个窗口部件
    fileMenu = menuBar()->addMenu(tr("&File"));
    fileMenu->addAction(newAction);
    fileMenu->addAction(openAction);
    fileMenu->addAction(saveAction);
    fileMenu->addAction(saveAsAction);
    separatorAction = fileMenu->addSeparator();	//分隔符
    //最近打开的文件
    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);

    //Select是Edit菜单下的一个子菜单
    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);

    //菜单栏中增加间隔
    menuBar()->addSeparator();

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

/**************************
任何Qt窗口部件都可以有一个与之相关联的QAction列表。要为该应用程序提供一个上下文菜单，可以将
所需要的动作添加到Spreadsheet窗口部件中，并且将那个窗口部件的上下文菜单策略(context menu policy)
设置为一个显示这些动作的上下文菜单。当用户在一个窗口部件上单击鼠标右键，或者是在键盘上按下一个与平台相关的按键时，就可以激活这些上下文菜单。
*****************************/
void MainWindow::createContextMenu()
{
    //将菜单栏cutAction，copyAction和pasteAction关联到spreadsheet中
    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 ");
    //默认情况下是向左对齐并且垂直居中
    locationLabel->setAlignment(Qt::AlignHCenter);
    locationLabel->setMinimumSize(locationLabel->sizeHint());

    formulaLabel = new QLabel;
    //设定缩进大小
    formulaLabel->setIndent(3);

    statusBar()->addWidget(locationLabel);
    //1为伸展因子，防止状态显示过于靠近
    statusBar()->addWidget(formulaLabel, 1);

    connect(spreadsheet, SIGNAL(currentCellChanged(int, int, int, int)),
            this, SLOT(updateStatusBar()));
    //修改(modified)后更新状态栏
    connect(spreadsheet, SIGNAL(modified()),
            this, SLOT(spreadsheetModified()));

    //更新状态栏
    updateStatusBar();
}

//读取配置---通常为键值方式
void MainWindow::readSettings()
{
    QSettings settings("Software Inc.", "Spreadsheet");

    restoreGeometry(settings.value("geometry").toByteArray());

    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", saveGeometry());
    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::No
                        | QMessageBox::Cancel);
        if (r == QMessageBox::Yes) {
            return save();
        } else if (r == QMessageBox::Cancel) {
            return false;
        }
    }
    return true;
}

bool MainWindow::loadFile(const QString &fileName)
{
    //readFile从磁盘中读取文件并显示出来
    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 = tr("Untitled");
    if (!curFile.isEmpty()) {
        //strippedName:移除文件名中的路径字符
        shownName = strippedName(curFile);
        //从最近打开文件中移除当前文件
        recentFiles.removeAll(curFile);
        //将当前文件加入最近打开文件的开头
        recentFiles.prepend(curFile);
        //更新最近打开文件
        updateRecentFileActions();
    }

    //显示标题(*代表已修改而未保存)
    setWindowTitle(tr("%1[*] - %2").arg(shownName)
                                   .arg(tr("Spreadsheet")));
}

void MainWindow::updateRecentFileActions()
{
    QMutableStringListIterator i(recentFiles);
    //用来移除任何不存在的文件
    while (i.hasNext()) {
        if (!QFile::exists(i.next()))
            i.remove();
    }

    for (int j = 0; j < MaxRecentFiles; ++j) {
        if (j < recentFiles.count()) {
            //保存最近打开文件的信息
            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();
}