#include <qapplication.h>#include <qfile.h>#include <qfiledialog.h>#include <qmessagebox.h>#include <qpixmap.h>#include "editor.h"Editor::Editor(QWidget *parent, const char *name)    : QTextEdit(parent, name){    setWFlags(WDestructiveClose);    setIcon(QPixmap::fromMimeSource("document.png"));    isUntitled = true;    fileFilters = tr("Text files (*.txt)\n"                     "All files (*)");}void Editor::newFile(){    static int documentNumber = 1;    curFile = tr("document%1.txt").arg(documentNumber);    setCaption(curFile);    isUntitled = true;    ++documentNumber;}bool Editor::open(){    QString fileName =            QFileDialog::getOpenFileName(".", fileFilters, this);    if (fileName.isEmpty())        return false;    return openFile(fileName);}bool Editor::openFile(const QString &fileName){    bool ok = readFile(fileName);    if (ok) {        setCurrentFile(fileName);        emit message(tr("File loaded"), 2000);    } else {        emit message(tr("Loading canceled"), 2000);    }    return ok;}bool Editor::save(){    if (isUntitled) {        return saveAs();    } else {        saveFile(curFile);        return true;    }}bool Editor::saveAs(){    QString fileName =            QFileDialog::getSaveFileName(curFile, fileFilters, this);    if (fileName.isEmpty())        return false;    if (QFile::exists(fileName)) {        int ret = QMessageBox::warning(this, tr("Editor"),                     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 Editor::closeEvent(QCloseEvent *event){    if (maybeSave())        event->accept();    else        event->ignore();}bool Editor::maybeSave(){    if (isModified()) {        int ret = QMessageBox::warning(this, tr("Editor"),                     tr("File %1 has been modified.\n"                        "Do you want to save your changes?")                     .arg(strippedName(curFile)),                     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 Editor::saveFile(const QString &fileName){    if (writeFile(fileName)) {        setCurrentFile(fileName);        emit message(tr("File saved"), 2000);    } else {        emit message(tr("Saving canceled"), 2000);    }}void Editor::setCurrentFile(const QString &fileName){    curFile = fileName;    setCaption(strippedName(curFile));    isUntitled = false;    setModified(false);}QSize Editor::sizeHint() const{    return QSize(72 * fontMetrics().width('x'),                 25 * fontMetrics().lineSpacing());}bool Editor::readFile(const QString &fileName){    QFile file(fileName);    if (!file.open(IO_ReadOnly)) {        QMessageBox::warning(this, tr("Editor"),                             tr("Cannot read file %1:\n%2.")                             .arg(file.name())                             .arg(file.errorString()));        return false;    }    QTextStream in(&file);    QApplication::setOverrideCursor(waitCursor);    setText(in.read());    QApplication::restoreOverrideCursor();    return true;}bool Editor::writeFile(const QString &fileName){    QFile file(fileName);    if (!file.open(IO_WriteOnly)) {        QMessageBox::warning(this, tr("Editor"),                             tr("Cannot write file %1:\n%2.")                             .arg(file.name())                             .arg(file.errorString()));        return false;    }    QTextStream out(&file);    QApplication::setOverrideCursor(waitCursor);    out << text();    QApplication::restoreOverrideCursor();    return true;}QString Editor::strippedName(const QString &fullFileName){    return QFileInfo(fullFileName).fileName();}