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** This file is part of the examples of the Qt Toolkit.

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#include <QtGui>

#include "mainwindow.h"

#include "mdichild.h"

MainWindow::MainWindow()

{

    mdiArea = new QMdiArea;

    mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);

    mdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

    setCentralWidget(mdiArea);

    connect(mdiArea, SIGNAL(subWindowActivated(QMdiSubWindow*)),

            this, SLOT(updateMenus()));

    windowMapper = new QSignalMapper(this);

    connect(windowMapper, SIGNAL(mapped(QWidget*)),

            this, SLOT(setActiveSubWindow(QWidget*)));

    createActions();

    createMenus();

    createToolBars();

    createStatusBar();

    updateMenus();

    readSettings();

    setWindowTitle(tr("MDI"));

    setUnifiedTitleAndToolBarOnMac(true);

}

void MainWindow::closeEvent(QCloseEvent *event)

{

    mdiArea->closeAllSubWindows();

    if (mdiArea->currentSubWindow()) {

        event->ignore();

    } else {

        writeSettings();

        event->accept();

    }

}

void MainWindow::newFile()

{

    MdiChild *child = createMdiChild();

    child->newFile();

    child->show();

}

void MainWindow::open()

{

    QString fileName = QFileDialog::getOpenFileName(this);

    if (!fileName.isEmpty()) {

        QMdiSubWindow *existing = findMdiChild(fileName);

        if (existing) {

            mdiArea->setActiveSubWindow(existing);

            return;

        }

        MdiChild *child = createMdiChild();

        if (child->loadFile(fileName)) {

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

            child->show();

        } else {

            child->close();

        }

    }

}

void MainWindow::save()

{

    if (activeMdiChild() && activeMdiChild()->save())

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

}

void MainWindow::saveAs()

{

    if (activeMdiChild() && activeMdiChild()->saveAs())

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

}

void MainWindow::cut()

{

    if (activeMdiChild())

        activeMdiChild()->cut();

}

void MainWindow::copy()

{

    if (activeMdiChild())

        activeMdiChild()->copy();

}

void MainWindow::paste()

{

    if (activeMdiChild())

        activeMdiChild()->paste();

}

void MainWindow::about()

{

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

            tr("The <b>MDI</b> example demonstrates how to write multiple "

               "document interface applications using Qt."));

}

void MainWindow::updateMenus()

{

    bool hasMdiChild = (activeMdiChild() != 0);

    saveAct->setEnabled(hasMdiChild);

    saveAsAct->setEnabled(hasMdiChild);

    pasteAct->setEnabled(hasMdiChild);

    closeAct->setEnabled(hasMdiChild);

    closeAllAct->setEnabled(hasMdiChild);

    tileAct->setEnabled(hasMdiChild);

    cascadeAct->setEnabled(hasMdiChild);

    nextAct->setEnabled(hasMdiChild);

    previousAct->setEnabled(hasMdiChild);

    separatorAct->setVisible(hasMdiChild);

    bool hasSelection = (activeMdiChild() &&

                         activeMdiChild()->textCursor().hasSelection());

    cutAct->setEnabled(hasSelection);

    copyAct->setEnabled(hasSelection);

}

void MainWindow::updateWindowMenu()

{

    windowMenu->clear();

    windowMenu->addAction(closeAct);

    windowMenu->addAction(closeAllAct);

    windowMenu->addSeparator();

    windowMenu->addAction(tileAct);

    windowMenu->addAction(cascadeAct);

    windowMenu->addSeparator();

    windowMenu->addAction(nextAct);

    windowMenu->addAction(previousAct);

    windowMenu->addAction(separatorAct);

    QList<QMdiSubWindow *> windows = mdiArea->subWindowList();

    separatorAct->setVisible(!windows.isEmpty());

    for (int i = 0; i < windows.size(); ++i) {

        MdiChild *child = qobject_cast<MdiChild *>(windows.at(i)->widget());

        QString text;

        if (i < 9) {

            text = tr("&%1 %2").arg(i + 1)

                               .arg(child->userFriendlyCurrentFile());

        } else {

            text = tr("%1 %2").arg(i + 1)

                              .arg(child->userFriendlyCurrentFile());

        }

        QAction *action  = windowMenu->addAction(text);

        action->setCheckable(true);

        action ->setChecked(child == activeMdiChild());

        connect(action, SIGNAL(triggered()), windowMapper, SLOT(map()));

        windowMapper->setMapping(action, windows.at(i));

    }

}

MdiChild *MainWindow::createMdiChild()

{

    MdiChild *child = new MdiChild;

    mdiArea->addSubWindow(child);

    connect(child, SIGNAL(copyAvailable(bool)),

            cutAct, SLOT(setEnabled(bool)));

    connect(child, SIGNAL(copyAvailable(bool)),

            copyAct, SLOT(setEnabled(bool)));

    return child;

}

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()));

//! [0]

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

    exitAct->setShortcuts(QKeySequence::Quit);

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

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

//! [0]

    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()), this, 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()), this, 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()), this, SLOT(paste()));

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

    closeAct->setStatusTip(tr("Close the active window"));

    connect(closeAct, SIGNAL(triggered()),

            mdiArea, SLOT(closeActiveSubWindow()));

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

    closeAllAct->setStatusTip(tr("Close all the windows"));

    connect(closeAllAct, SIGNAL(triggered()),

            mdiArea, SLOT(closeAllSubWindows()));

    tileAct = new QAction(tr("&Tile"), this);

    tileAct->setStatusTip(tr("Tile the windows"));

    connect(tileAct, SIGNAL(triggered()), mdiArea, SLOT(tileSubWindows()));

    cascadeAct = new QAction(tr("&Cascade"), this);

    cascadeAct->setStatusTip(tr("Cascade the windows"));

    connect(cascadeAct, SIGNAL(triggered()), mdiArea, SLOT(cascadeSubWindows()));

    nextAct = new QAction(tr("Ne&xt"), this);

    nextAct->setShortcuts(QKeySequence::NextChild);

    nextAct->setStatusTip(tr("Move the focus to the next window"));

    connect(nextAct, SIGNAL(triggered()),

            mdiArea, SLOT(activateNextSubWindow()));

    previousAct = new QAction(tr("Pre&vious"), this);

    previousAct->setShortcuts(QKeySequence::PreviousChild);

    previousAct->setStatusTip(tr("Move the focus to the previous "

                                 "window"));

    connect(previousAct, SIGNAL(triggered()),

            mdiArea, SLOT(activatePreviousSubWindow()));

    separatorAct = new QAction(this);

    separatorAct->setSeparator(true);

    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()));

}

void MainWindow::createMenus()

{

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

    fileMenu->addAction(newAct);

    fileMenu->addAction(openAct);

    fileMenu->addAction(saveAct);

    fileMenu->addAction(saveAsAct);

    fileMenu->addSeparator();

    QAction *action = fileMenu->addAction(tr("Switch layout direction"));

    connect(action, SIGNAL(triggered()), this, SLOT(switchLayoutDirection()));

    fileMenu->addAction(exitAct);

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

    editMenu->addAction(cutAct);

    editMenu->addAction(copyAct);

    editMenu->addAction(pasteAct);

    windowMenu = menuBar()->addMenu(tr("&Window"));

    updateWindowMenu();

    connect(windowMenu, SIGNAL(aboutToShow()), this, SLOT(updateWindowMenu()));

    menuBar()->addSeparator();

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

    helpMenu->addAction(aboutAct);

    helpMenu->addAction(aboutQtAct);

}

void MainWindow::createToolBars()

{

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

    fileToolBar->addAction(newAct);

    fileToolBar->addAction(openAct);

    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("Trolltech", "MDI Example");

    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("Trolltech", "MDI Example");

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

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

}

MdiChild *MainWindow::activeMdiChild()

{

    if (QMdiSubWindow *activeSubWindow = mdiArea->activeSubWindow())

        return qobject_cast<MdiChild *>(activeSubWindow->widget());

    return 0;

}

QMdiSubWindow *MainWindow::findMdiChild(const QString &fileName)

{

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

    foreach (QMdiSubWindow *window, mdiArea->subWindowList()) {

        MdiChild *mdiChild = qobject_cast<MdiChild *>(window->widget());

        if (mdiChild->currentFile() == canonicalFilePath)

            return window;

    }

    return 0;

}

void MainWindow::switchLayoutDirection()

{

    if (layoutDirection() == Qt::LeftToRight)

        qApp->setLayoutDirection(Qt::RightToLeft);

    else

        qApp->setLayoutDirection(Qt::LeftToRight);

}

void MainWindow::setActiveSubWindow(QWidget *window)

{

    if (!window)

        return;

    mdiArea->setActiveSubWindow(qobject_cast<QMdiSubWindow *>(window));

}