source: trunk/examples/mainwindows/mdi/mainwindow.cpp@ 296

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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 (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()) {
        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);