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    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 

    44 #include "mainwindow.h"

    45 #include "mdichild.h"

    46 

    47 MainWindow::MainWindow()

    48 {

    49     mdiArea = new QMdiArea;

    50     mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);

    51     mdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

    52     setCentralWidget(mdiArea);

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

    54             this, SLOT(updateMenus()));

    55     windowMapper = new QSignalMapper(this);

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

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

    58 

    59     createActions();

    60     createMenus();

    61     createToolBars();

    62     createStatusBar();

    63     updateMenus();

    64 

    65     readSettings();

    66 

    67     setWindowTitle(tr("MDI"));

    68     setUnifiedTitleAndToolBarOnMac(true);

    69 }

    70 

    71 void MainWindow::closeEvent(QCloseEvent *event)

    72 {

    73     mdiArea->closeAllSubWindows();

    74     if (activeMdiChild()) {

    75         event->ignore();

    76     } else {

    77         writeSettings();

    78         event->accept();

    79     }

    80 }

    81 

    82 void MainWindow::newFile()

    83 {

    84     MdiChild *child = createMdiChild();

    85     child->newFile();

    86     child->show();

    87 }

    88 

    89 void MainWindow::open()

    90 {

    91     QString fileName = QFileDialog::getOpenFileName(this);

    92     if (!fileName.isEmpty()) {

    93         QMdiSubWindow *existing = findMdiChild(fileName);

    94         if (existing) {

    95             mdiArea->setActiveSubWindow(existing);

    96             return;

    97         }

    98 

    99         MdiChild *child = createMdiChild();

   100         if (child->loadFile(fileName)) {

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

   102             child->show();

   103         } else {

   104             child->close();

   105         }

   106     }

   107 }

   108 

   109 void MainWindow::save()

   110 {

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

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

   113 }

   114 

   115 void MainWindow::saveAs()

   116 {

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

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

   119 }

   120 

   121 void MainWindow::cut()

   122 {

   123     if (activeMdiChild())

   124         activeMdiChild()->cut();

   125 }

   126 

   127 void MainWindow::copy()

   128 {

   129     if (activeMdiChild())

   130         activeMdiChild()->copy();

   131 }

   132 

   133 void MainWindow::paste()

   134 {

   135     if (activeMdiChild())

   136         activeMdiChild()->paste();

   137 }

   138 

   139 void MainWindow::about()

   140 {

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

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

   143                "document interface applications using Qt."));

   144 }

   145 

   146 void MainWindow::updateMenus()

   147 {

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

   149     saveAct->setEnabled(hasMdiChild);

   150     saveAsAct->setEnabled(hasMdiChild);

   151     pasteAct->setEnabled(hasMdiChild);

   152     closeAct->setEnabled(hasMdiChild);

   153     closeAllAct->setEnabled(hasMdiChild);

   154     tileAct->setEnabled(hasMdiChild);

   155     cascadeAct->setEnabled(hasMdiChild);

   156     nextAct->setEnabled(hasMdiChild);

   157     previousAct->setEnabled(hasMdiChild);

   158     separatorAct->setVisible(hasMdiChild);

   159 

   160     bool hasSelection = (activeMdiChild() &&

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

   162     cutAct->setEnabled(hasSelection);

   163     copyAct->setEnabled(hasSelection);

   164 }

   165 

   166 void MainWindow::updateWindowMenu()

   167 {

   168     windowMenu->clear();

   169     windowMenu->addAction(closeAct);

   170     windowMenu->addAction(closeAllAct);

   171     windowMenu->addSeparator();

   172     windowMenu->addAction(tileAct);

   173     windowMenu->addAction(cascadeAct);

   174     windowMenu->addSeparator();

   175     windowMenu->addAction(nextAct);

   176     windowMenu->addAction(previousAct);

   177     windowMenu->addAction(separatorAct);

   178 

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

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

   181 

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

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

   184 

   185         QString text;

   186         if (i < 9) {

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

   188                                .arg(child->userFriendlyCurrentFile());

   189         } else {

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

   191                               .arg(child->userFriendlyCurrentFile());

   192         }

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

   194         action->setCheckable(true);

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

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

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

   198     }

   199 }

   200 

   201 MdiChild *MainWindow::createMdiChild()

   202 {

   203     MdiChild *child = new MdiChild;

   204     mdiArea->addSubWindow(child);

   205 

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

   207             cutAct, SLOT(setEnabled(bool)));

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

   209             copyAct, SLOT(setEnabled(bool)));

   210 

   211     return child;

   212 }

   213 

   214 void MainWindow::createActions()

   215 {

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

   217     newAct->setShortcuts(QKeySequence::New);

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

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

   220 

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

   222     openAct->setShortcuts(QKeySequence::Open);

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

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

   225 

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

   227     saveAct->setShortcuts(QKeySequence::Save);

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

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

   230 

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

   232     saveAsAct->setShortcuts(QKeySequence::SaveAs);

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

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

   235 

   236 //! [0]

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

   238     exitAct->setShortcuts(QKeySequence::Quit);

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

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

   241 //! [0]

   242 

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

   244     cutAct->setShortcuts(QKeySequence::Cut);

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

   246                             "clipboard"));

   247     connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));

   248 

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

   250     copyAct->setShortcuts(QKeySequence::Copy);

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

   252                              "clipboard"));

   253     connect(copyAct, SIGNAL(triggered()), this, SLOT(copy()));

   254 

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

   256     pasteAct->setShortcuts(QKeySequence::Paste);

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

   258                               "selection"));

   259     connect(pasteAct, SIGNAL(triggered()), this, SLOT(paste()));

   260 

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

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

   263     connect(closeAct, SIGNAL(triggered()),

   264             mdiArea, SLOT(closeActiveSubWindow()));

   265 

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

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

   268     connect(closeAllAct, SIGNAL(triggered()),

   269             mdiArea, SLOT(closeAllSubWindows()));

   270 

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

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

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

   274 

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

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

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

   278 

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

   280     nextAct->setShortcuts(QKeySequence::NextChild);

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

   282     connect(nextAct, SIGNAL(triggered()),

   283             mdiArea, SLOT(activateNextSubWindow()));

   284 

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

   286     previousAct->setShortcuts(QKeySequence::PreviousChild);

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

   288                                  "window"));

   289     connect(previousAct, SIGNAL(triggered()),

   290             mdiArea, SLOT(activatePreviousSubWindow()));

   291 

   292     separatorAct = new QAction(this);

   293     separatorAct->setSeparator(true);

   294 

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

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

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

   298 

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

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

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

   302 }

   303 

   304 void MainWindow::createMenus()

   305 {

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

   307     fileMenu->addAction(newAct);

   308     fileMenu->addAction(openAct);

   309     fileMenu->addAction(saveAct);

   310     fileMenu->addAction(saveAsAct);

   311     fileMenu->addSeparator();

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

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

   314     fileMenu->addAction(exitAct);

   315 

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

   317     editMenu->addAction(cutAct);

   318     editMenu->addAction(copyAct);

   319     editMenu->addAction(pasteAct);

   320 

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

   322     updateWindowMenu();

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

   324 

   325     menuBar()->addSeparator();

   326 

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

   328     helpMenu->addAction(aboutAct);

   329     helpMenu->addAction(aboutQtAct);

   330 }

   331 

   332 void MainWindow::createToolBars()

   333 {

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

   335     fileToolBar->addAction(newAct);

   336     fileToolBar->addAction(openAct);

   337     fileToolBar->addAction(saveAct);

   338 

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

   340     editToolBar->addAction(cutAct);

   341     editToolBar->addAction(copyAct);

   342     editToolBar->addAction(pasteAct);

   343 }

   344 

   345 void MainWindow::createStatusBar()

   346 {

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

   348 }

   349 

   350 void MainWindow::readSettings()

   351 {

   352     QSettings settings("Trolltech", "MDI Example");

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

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

   355     move(pos);

   356     resize(size);

   357 }

   358 

   359 void MainWindow::writeSettings()

   360 {

   361     QSettings settings("Trolltech", "MDI Example");

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

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

   364 }

   365 

   366 MdiChild *MainWindow::activeMdiChild()

   367 {

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

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

   370     return 0;

   371 }

   372 

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

   374 {

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

   376 

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

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

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

   380             return window;

   381     }

   382     return 0;

   383 }

   384 

   385 void MainWindow::switchLayoutDirection()

   386 {

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

   388         qApp->setLayoutDirection(Qt::RightToLeft);

   389     else

   390         qApp->setLayoutDirection(Qt::LeftToRight);

   391 }

   392 

   393 void MainWindow::setActiveSubWindow(QWidget *window)

   394 {

   395     if (!window)

   396         return;

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

   398 }