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#include <QtGui>

#include "mainwindow.h"

MainWindow::MainWindow()

{

    init();

    setCurrentFile("");

}

MainWindow::MainWindow(const QString &fileName)

{

    init();

    loadFile(fileName);

}

void MainWindow::closeEvent(QCloseEvent *event)

{

    if (maybeSave()) {

        writeSettings();

        event->accept();

    } else {

        event->ignore();

    }

}

void MainWindow::newFile()

{

    MainWindow *other = new MainWindow;

    other->move(x() + 40, y() + 40);

    other->show();

}

void MainWindow::open()

{

    QString fileName = QFileDialog::getOpenFileName(this);

    if (!fileName.isEmpty()) {

        MainWindow *existing = findMainWindow(fileName);

        if (existing) {

            existing->show();

            existing->raise();

            existing->activateWindow();

            return;

        }

        if (isUntitled && textEdit->document()->isEmpty()

                && !isWindowModified()) {

            loadFile(fileName);

        } else {

            MainWindow *other = new MainWindow(fileName);

            if (other->isUntitled) {

                delete other;

                return;

            }

            other->move(x() + 40, y() + 40);

            other->show();

        }

    }

}

bool MainWindow::save()

{

    if (isUntitled) {

        return saveAs();

    } else {

        return saveFile(curFile);

    }

}

bool MainWindow::saveAs()

{

    QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),

                                                    curFile);

    if (fileName.isEmpty())

        return false;

    return saveFile(fileName);

}

void MainWindow::about()

{

   QMessageBox::about(this, tr("About SDI"),

            tr("The <b>SDI</b> example demonstrates how to write single "

               "document interface applications using Qt."));

}

void MainWindow::documentWasModified()

{

    setWindowModified(true);

}

void MainWindow::init()

{

    setAttribute(Qt::WA_DeleteOnClose);

    isUntitled = true;

    textEdit = new QTextEdit;

    setCentralWidget(textEdit);

    createActions();

    createMenus();

    createToolBars();

    createStatusBar();

    readSettings();

    connect(textEdit->document(), SIGNAL(contentsChanged()),

            this, SLOT(documentWasModified()));

    setUnifiedTitleAndToolBarOnMac(true);

}

void MainWindow::createActions()

{

    newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);

    newAct->setShortcuts(QKeySequence::New);

    newAct->setStatusTip(tr("Create a new file"));

    connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));

    openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);

    openAct->setShortcuts(QKeySequence::Open);

    openAct->setStatusTip(tr("Open an existing file"));

    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

    saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);

    saveAct->setShortcuts(QKeySequence::Save);

    saveAct->setStatusTip(tr("Save the document to disk"));

    connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));

    saveAsAct = new QAction(tr("Save &As..."), this);

    saveAsAct->setShortcuts(QKeySequence::SaveAs);

    saveAsAct->setStatusTip(tr("Save the document under a new name"));

    connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

    closeAct = new QAction(tr("&Close"), this);

    closeAct->setShortcut(tr("Ctrl+W"));

    closeAct->setStatusTip(tr("Close this window"));

    connect(closeAct, SIGNAL(triggered()), this, SLOT(close()));

    exitAct = new QAction(tr("E&xit"), this);

    exitAct->setShortcuts(QKeySequence::Quit);

    exitAct->setStatusTip(tr("Exit the application"));

    connect(exitAct, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()));

    cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);

    cutAct->setShortcuts(QKeySequence::Cut);

    cutAct->setStatusTip(tr("Cut the current selection's contents to the "

                            "clipboard"));

    connect(cutAct, SIGNAL(triggered()), textEdit, SLOT(cut()));

    copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);

    copyAct->setShortcuts(QKeySequence::Copy);

    copyAct->setStatusTip(tr("Copy the current selection's contents to the "

                             "clipboard"));

    connect(copyAct, SIGNAL(triggered()), textEdit, SLOT(copy()));

    pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);

    pasteAct->setShortcuts(QKeySequence::Paste);

    pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "

                              "selection"));

    connect(pasteAct, SIGNAL(triggered()), textEdit, SLOT(paste()));

    aboutAct = new QAction(tr("&About"), this);

    aboutAct->setStatusTip(tr("Show the application's About box"));

    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

    aboutQtAct = new QAction(tr("About &Qt"), this);

    aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));

    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

    cutAct->setEnabled(false);

    copyAct->setEnabled(false);

    connect(textEdit, SIGNAL(copyAvailable(bool)),

            cutAct, SLOT(setEnabled(bool)));

    connect(textEdit, SIGNAL(copyAvailable(bool)),

            copyAct, SLOT(setEnabled(bool)));

}

//! [implicit tr context]

void MainWindow::createMenus()

{

    fileMenu = menuBar()->addMenu(tr("&File"));

//! [implicit tr context]

    fileMenu->addAction(newAct);

    fileMenu->addAction(openAct);

    fileMenu->addAction(saveAct);

    fileMenu->addAction(saveAsAct);

    fileMenu->addSeparator();

    fileMenu->addAction(closeAct);

    fileMenu->addAction(exitAct);

    editMenu = menuBar()->addMenu(tr("&Edit"));

    editMenu->addAction(cutAct);

    editMenu->addAction(copyAct);

    editMenu->addAction(pasteAct);

    menuBar()->addSeparator();

    helpMenu = menuBar()->addMenu(tr("&Help"));

    helpMenu->addAction(aboutAct);

    helpMenu->addAction(aboutQtAct);

}

void MainWindow::createToolBars()

{

//! [0]

    fileToolBar = addToolBar(tr("File"));

    fileToolBar->addAction(newAct);

    fileToolBar->addAction(openAct);

//! [0]

    fileToolBar->addAction(saveAct);

    editToolBar = addToolBar(tr("Edit"));

    editToolBar->addAction(cutAct);

    editToolBar->addAction(copyAct);

    editToolBar->addAction(pasteAct);

}

void MainWindow::createStatusBar()

{

    statusBar()->showMessage(tr("Ready"));

}

void MainWindow::readSettings()

{

    QSettings settings;

    QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();

    QSize size = settings.value("size", QSize(400, 400)).toSize();

    move(pos);

    resize(size);

}

void MainWindow::writeSettings()

{

    QSettings settings;

    settings.setValue("pos", pos());

    settings.setValue("size", size());

}

bool MainWindow::maybeSave()

{

    if (textEdit->document()->isModified()) {

	QMessageBox::StandardButton ret;

        ret = QMessageBox::warning(this, tr("SDI"),

                     tr("The document has been modified.\n"

                        "Do you want to save your changes?"),

                     QMessageBox::Save | QMessageBox::Discard

		     | QMessageBox::Cancel);

        if (ret == QMessageBox::Save)

            return save();

        else if (ret == QMessageBox::Cancel)

            return false;

    }

    return true;

}

void MainWindow::loadFile(const QString &fileName)

{

    QFile file(fileName);

    if (!file.open(QFile::ReadOnly | QFile::Text)) {

        QMessageBox::warning(this, tr("SDI"),

                             tr("Cannot read file %1:\n%2.")

                             .arg(fileName)

                             .arg(file.errorString()));

        return;

    }

    QTextStream in(&file);

    QApplication::setOverrideCursor(Qt::WaitCursor);

    textEdit->setPlainText(in.readAll());

    QApplication::restoreOverrideCursor();

    setCurrentFile(fileName);

    statusBar()->showMessage(tr("File loaded"), 2000);

}

bool MainWindow::saveFile(const QString &fileName)

{

    QFile file(fileName);

    if (!file.open(QFile::WriteOnly | QFile::Text)) {

        QMessageBox::warning(this, tr("SDI"),

                             tr("Cannot write file %1:\n%2.")

                             .arg(fileName)

                             .arg(file.errorString()));

        return false;

    }

    QTextStream out(&file);

    QApplication::setOverrideCursor(Qt::WaitCursor);

    out << textEdit->toPlainText();

    QApplication::restoreOverrideCursor();

    setCurrentFile(fileName);

    statusBar()->showMessage(tr("File saved"), 2000);

    return true;

}

void MainWindow::setCurrentFile(const QString &fileName)

{

    static int sequenceNumber = 1;

    isUntitled = fileName.isEmpty();

    if (isUntitled) {

        curFile = tr("document%1.txt").arg(sequenceNumber++);

    } else {

        curFile = QFileInfo(fileName).canonicalFilePath();

    }

    textEdit->document()->setModified(false);

    setWindowModified(false);

    setWindowFilePath(curFile);

}

QString MainWindow::strippedName(const QString &fullFileName)

{

    return QFileInfo(fullFileName).fileName();

}

MainWindow *MainWindow::findMainWindow(const QString &fileName)

{

    QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();

    foreach (QWidget *widget, qApp->topLevelWidgets()) {

        MainWindow *mainWin = qobject_cast<MainWindow *>(widget);

        if (mainWin && mainWin->curFile == canonicalFilePath)

            return mainWin;

    }

    return 0;

}