Viadeo Twitter Google Bookmarks ! Facebook Digg del.icio.us MySpace Yahoo MyWeb Blinklist Netvouz Reddit Simpy StumbleUpon Bookmarks Windows Live Favorites 
Logo Documentation Qt ·  Page d'accueil  ·  Toutes les classes  ·  Toutes les fonctions  ·  Vues d'ensemble  · 

mainwindow.cpp Example File

mainwindows/mdi/mainwindow.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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()));

     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()), 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));
 }
Publicité

Best Of

Actualités les plus lues

Semaine
Mois
Année
  1. « Quelque chose ne va vraiment pas avec les développeurs "modernes" », un développeur à "l'ancienne" critique la multiplication des bibliothèques 94
  2. Apercevoir la troisième dimension ou l'utilisation multithreadée d'OpenGL dans Qt, un article des Qt Quarterly traduit par Guillaume Belz 0
  3. Pourquoi les programmeurs sont-ils moins payés que les gestionnaires de programmes ? Manquent-ils de pouvoir de négociation ? 43
  4. Les développeurs ignorent-ils trop les failles découvertes dans leur code ? Prenez-vous en compte les remarques des autres ? 17
  5. Quelles nouveautés de C++11 Visual C++ doit-il rapidement intégrer ? Donnez-nous votre avis 10
  6. Qt Commercial : Digia organise un webinar gratuit le 27 mars sur la conception d'interfaces utilisateur et d'applications avec le framework 0
  7. 2017 : un quinquennat pour une nouvelle version du C++ ? Possible, selon Herb Sutter 9
Page suivante

Le blog Digia au hasard

Logo

Déploiement d'applications Qt Commercial sur les tablettes Windows 8

Le blog Digia est l'endroit privilégié pour la communication sur l'édition commerciale de Qt, où des réponses publiques sont apportées aux questions les plus posées au support. Lire l'article.

Communauté

Ressources

Liens utiles

Contact

  • Vous souhaitez rejoindre la rédaction ou proposer un tutoriel, une traduction, une question... ? Postez dans le forum Contribuez ou contactez-nous par MP ou par email (voir en bas de page).

Qt dans le magazine

Cette page est une traduction d'une page de la documentation de Qt, écrite par Nokia Corporation and/or its subsidiary(-ies). Les éventuels problèmes résultant d'une mauvaise traduction ne sont pas imputables à Nokia. Qt 4.7-snapshot
Copyright © 2012 Developpez LLC. Tous droits réservés Developpez LLC. Aucune reproduction, même partielle, ne peut être faite de ce site et de l'ensemble de son contenu : textes, documents et images sans l'autorisation expresse de Developpez LLC. Sinon, vous encourez selon la loi jusqu'à 3 ans de prison et jusqu'à 300 000 E de dommages et intérêts. Cette page est déposée à la SACD.
Vous avez déniché une erreur ? Un bug ? Une redirection cassée ? Ou tout autre problème, quel qu'il soit ? Ou bien vous désirez participer à ce projet de traduction ? N'hésitez pas à nous contacter ou par MP !
 
 
 
 
Partenaires

Hébergement Web