/******************************************************************************** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.**** This file is part of the example classes of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#include <QtGui>#include "mainwindow.h"#include "mdichild.h"MainWindow::MainWindow(){    workspace = new QWorkspace;    setCentralWidget(workspace);    connect(workspace, SIGNAL(windowActivated(QWidget *)),            this, SLOT(updateMenus()));    windowMapper = new QSignalMapper(this);    connect(windowMapper, SIGNAL(mapped(QWidget *)),            workspace, SLOT(setActiveWindow(QWidget *)));    createActions();    createMenus();    createToolBars();    createStatusBar();    updateMenus();    readSettings();    setWindowTitle(tr("MDI"));}void MainWindow::closeEvent(QCloseEvent *event){    workspace->closeAllWindows();    if (activeMdiChild()) {        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()) {        MdiChild *existing = findMdiChild(fileName);        if (existing) {            workspace->setActiveWindow(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()->save())        statusBar()->showMessage(tr("File saved"), 2000);}void MainWindow::saveAs(){    if (activeMdiChild()->saveAs())        statusBar()->showMessage(tr("File saved"), 2000);}void MainWindow::cut(){    activeMdiChild()->cut();}void MainWindow::copy(){    activeMdiChild()->copy();}void MainWindow::paste(){    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);    arrangeAct->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->addAction(arrangeAct);    windowMenu->addSeparator();    windowMenu->addAction(nextAct);    windowMenu->addAction(previousAct);    windowMenu->addAction(separatorAct);    QList<QWidget *> windows = workspace->windowList();    separatorAct->setVisible(!windows.isEmpty());    for (int i = 0; i < windows.size(); ++i) {        MdiChild *child = qobject_cast<MdiChild *>(windows.at(i));        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, child);    }}MdiChild *MainWindow::createMdiChild(){    MdiChild *child = new MdiChild;    workspace->addWindow(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->setShortcut(tr("Ctrl+N"));    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->setShortcut(tr("Ctrl+O"));    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->setShortcut(tr("Ctrl+S"));    saveAct->setStatusTip(tr("Save the document to disk"));    connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));    saveAsAct = new QAction(tr("Save &As..."), this);    saveAsAct->setStatusTip(tr("Save the document under a new name"));    connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));    exitAct = new QAction(tr("E&xit"), this);    exitAct->setShortcut(tr("Ctrl+Q"));    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->setShortcut(tr("Ctrl+X"));    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->setShortcut(tr("Ctrl+C"));    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->setShortcut(tr("Ctrl+V"));    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->setShortcut(tr("Ctrl+F4"));    closeAct->setStatusTip(tr("Close the active window"));    connect(closeAct, SIGNAL(triggered()),            workspace, SLOT(closeActiveWindow()));    closeAllAct = new QAction(tr("Close &All"), this);    closeAllAct->setStatusTip(tr("Close all the windows"));    connect(closeAllAct, SIGNAL(triggered()),            workspace, SLOT(closeAllWindows()));    tileAct = new QAction(tr("&Tile"), this);    tileAct->setStatusTip(tr("Tile the windows"));    connect(tileAct, SIGNAL(triggered()), workspace, SLOT(tile()));    cascadeAct = new QAction(tr("&Cascade"), this);    cascadeAct->setStatusTip(tr("Cascade the windows"));    connect(cascadeAct, SIGNAL(triggered()), workspace, SLOT(cascade()));    arrangeAct = new QAction(tr("Arrange &icons"), this);    arrangeAct->setStatusTip(tr("Arrange the icons"));    connect(arrangeAct, SIGNAL(triggered()), workspace, SLOT(arrangeIcons()));    nextAct = new QAction(tr("Ne&xt"), this);    nextAct->setStatusTip(tr("Move the focus to the next window"));    connect(nextAct, SIGNAL(triggered()),            workspace, SLOT(activateNextWindow()));    previousAct = new QAction(tr("Pre&vious"), this);    previousAct->setStatusTip(tr("Move the focus to the previous "                                 "window"));    connect(previousAct, SIGNAL(triggered()),            workspace, SLOT(activatePreviousWindow()));    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(){    return qobject_cast<MdiChild *>(workspace->activeWindow());}MdiChild *MainWindow::findMdiChild(const QString &fileName){    QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();    foreach (QWidget *window, workspace->windowList()) {        MdiChild *mdiChild = qobject_cast<MdiChild *>(window);        if (mdiChild->currentFile() == canonicalFilePath)            return mdiChild;    }    return 0;}void MainWindow::switchLayoutDirection(){    if (layoutDirection() == Qt::LeftToRight)        qApp->setLayoutDirection(Qt::RightToLeft);    else        qApp->setLayoutDirection(Qt::LeftToRight);}