Long live Qt 4.5!

1 files changed, 388 insertions, 0 deletions

diff --git a/examples/mainwindows/application/mainwindow.cpp b/examples/mainwindows/application/mainwindow.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+#include <QtGui>
+
+#include "mainwindow.h"
+//! [0]
+
+//! [1]
+MainWindow::MainWindow()
+//! [1] //! [2]
+{
+    textEdit = new QPlainTextEdit;
+    setCentralWidget(textEdit);
+
+    createActions();
+    createMenus();
+    createToolBars();
+    createStatusBar();
+
+    readSettings();
+
+    connect(textEdit->document(), SIGNAL(contentsChanged()),
+            this, SLOT(documentWasModified()));
+
+    setCurrentFile("");
+    setUnifiedTitleAndToolBarOnMac(true);
+}
+//! [2]
+
+//! [3]
+void MainWindow::closeEvent(QCloseEvent *event)
+//! [3] //! [4]
+{
+    if (maybeSave()) {
+        writeSettings();
+        event->accept();
+    } else {
+        event->ignore();
+    }
+}
+//! [4]
+
+//! [5]
+void MainWindow::newFile()
+//! [5] //! [6]
+{
+    if (maybeSave()) {
+        textEdit->clear();
+        setCurrentFile("");
+    }
+}
+//! [6]
+
+//! [7]
+void MainWindow::open()
+//! [7] //! [8]
+{
+    if (maybeSave()) {
+        QString fileName = QFileDialog::getOpenFileName(this);
+        if (!fileName.isEmpty())
+            loadFile(fileName);
+    }
+}
+//! [8]
+
+//! [9]
+bool MainWindow::save()
+//! [9] //! [10]
+{
+    if (curFile.isEmpty()) {
+        return saveAs();
+    } else {
+        return saveFile(curFile);
+    }
+}
+//! [10]
+
+//! [11]
+bool MainWindow::saveAs()
+//! [11] //! [12]
+{
+    QString fileName = QFileDialog::getSaveFileName(this);
+    if (fileName.isEmpty())
+        return false;
+
+    return saveFile(fileName);
+}
+//! [12]
+
+//! [13]
+void MainWindow::about()
+//! [13] //! [14]
+{
+   QMessageBox::about(this, tr("About Application"),
+            tr("The <b>Application</b> example demonstrates how to "
+               "write modern GUI applications using Qt, with a menu bar, "
+               "toolbars, and a status bar."));
+}
+//! [14]
+
+//! [15]
+void MainWindow::documentWasModified()
+//! [15] //! [16]
+{
+    setWindowModified(textEdit->document()->isModified());
+}
+//! [16]
+
+//! [17]
+void MainWindow::createActions()
+//! [17] //! [18]
+{
+    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()));
+
+//! [19]
+    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()));
+//! [18] //! [19]
+
+    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()));
+
+//! [20]
+    exitAct = new QAction(tr("E&xit"), this);
+    exitAct->setShortcut(tr("Ctrl+Q"));
+//! [20]
+    exitAct->setStatusTip(tr("Exit the application"));
+    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
+
+//! [21]
+    cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);
+//! [21]
+    cutAct->setShortcuts(QKeySequence::Cut);
+    cutAct->setStatusTip(tr("Cut the current selection's contents to the "
+                            "clipboard"));
+    connect(cutAct, SIGNAL(triggered()), textEdit, 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()), textEdit, 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()), textEdit, SLOT(paste()));
+
+    aboutAct = new QAction(tr("&About"), this);
+    aboutAct->setStatusTip(tr("Show the application's About box"));
+    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
+
+//! [22]
+    aboutQtAct = new QAction(tr("About &Qt"), this);
+    aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
+    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
+//! [22]
+
+//! [23]
+    cutAct->setEnabled(false);
+//! [23] //! [24]
+    copyAct->setEnabled(false);
+    connect(textEdit, SIGNAL(copyAvailable(bool)),
+            cutAct, SLOT(setEnabled(bool)));
+    connect(textEdit, SIGNAL(copyAvailable(bool)),
+            copyAct, SLOT(setEnabled(bool)));
+}
+//! [24]
+
+//! [25] //! [26]
+void MainWindow::createMenus()
+//! [25] //! [27]
+{
+    fileMenu = menuBar()->addMenu(tr("&File"));
+    fileMenu->addAction(newAct);
+//! [28]
+    fileMenu->addAction(openAct);
+//! [28]
+    fileMenu->addAction(saveAct);
+//! [26]
+    fileMenu->addAction(saveAsAct);
+    fileMenu->addSeparator();
+    fileMenu->addAction(exitAct);
+
+    editMenu = menuBar()->addMenu(tr("&Edit"));
+    editMenu->addAction(cutAct);
+    editMenu->addAction(copyAct);
+    editMenu->addAction(pasteAct);
+
+    menuBar()->addSeparator();
+
+    helpMenu = menuBar()->addMenu(tr("&Help"));
+    helpMenu->addAction(aboutAct);
+    helpMenu->addAction(aboutQtAct);
+}
+//! [27]
+
+//! [29] //! [30]
+void MainWindow::createToolBars()
+{
+    fileToolBar = addToolBar(tr("File"));
+    fileToolBar->addAction(newAct);
+//! [29] //! [31]
+    fileToolBar->addAction(openAct);
+//! [31]
+    fileToolBar->addAction(saveAct);
+
+    editToolBar = addToolBar(tr("Edit"));
+    editToolBar->addAction(cutAct);
+    editToolBar->addAction(copyAct);
+    editToolBar->addAction(pasteAct);
+}
+//! [30]
+
+//! [32]
+void MainWindow::createStatusBar()
+//! [32] //! [33]
+{
+    statusBar()->showMessage(tr("Ready"));
+}
+//! [33]
+
+//! [34] //! [35]
+void MainWindow::readSettings()
+//! [34] //! [36]
+{
+    QSettings settings("Trolltech", "Application Example");
+    QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
+    QSize size = settings.value("size", QSize(400, 400)).toSize();
+    resize(size);
+    move(pos);
+}
+//! [35] //! [36]
+
+//! [37] //! [38]
+void MainWindow::writeSettings()
+//! [37] //! [39]
+{
+    QSettings settings("Trolltech", "Application Example");
+    settings.setValue("pos", pos());
+    settings.setValue("size", size());
+}
+//! [38] //! [39]
+
+//! [40]
+bool MainWindow::maybeSave()
+//! [40] //! [41]
+{
+    if (textEdit->document()->isModified()) {
+        QMessageBox::StandardButton ret;
+        ret = QMessageBox::warning(this, tr("Application"),
+                     tr("The document has been modified.\n"
+                        "Do you want to save your changes?"),
+                     QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
+        if (ret == QMessageBox::Save)
+            return save();
+        else if (ret == QMessageBox::Cancel)
+            return false;
+    }
+    return true;
+}
+//! [41]
+
+//! [42]
+void MainWindow::loadFile(const QString &fileName)
+//! [42] //! [43]
+{
+    QFile file(fileName);
+    if (!file.open(QFile::ReadOnly | QFile::Text)) {
+        QMessageBox::warning(this, tr("Application"),
+                             tr("Cannot read file %1:\n%2.")
+                             .arg(fileName)
+                             .arg(file.errorString()));
+        return;
+    }
+
+    QTextStream in(&file);
+    QApplication::setOverrideCursor(Qt::WaitCursor);
+    textEdit->setPlainText(in.readAll());
+    QApplication::restoreOverrideCursor();
+
+    setCurrentFile(fileName);
+    statusBar()->showMessage(tr("File loaded"), 2000);
+}
+//! [43]
+
+//! [44]
+bool MainWindow::saveFile(const QString &fileName)
+//! [44] //! [45]
+{
+    QFile file(fileName);
+    if (!file.open(QFile::WriteOnly | QFile::Text)) {
+        QMessageBox::warning(this, tr("Application"),
+                             tr("Cannot write file %1:\n%2.")
+                             .arg(fileName)
+                             .arg(file.errorString()));
+        return false;
+    }
+
+    QTextStream out(&file);
+    QApplication::setOverrideCursor(Qt::WaitCursor);
+    out << textEdit->toPlainText();
+    QApplication::restoreOverrideCursor();
+
+    setCurrentFile(fileName);
+    statusBar()->showMessage(tr("File saved"), 2000);
+    return true;
+}
+//! [45]
+
+//! [46]
+void MainWindow::setCurrentFile(const QString &fileName)
+//! [46] //! [47]
+{
+    curFile = fileName;
+    textEdit->document()->setModified(false);
+    setWindowModified(false);
+
+    QString shownName;
+    if (curFile.isEmpty())
+        shownName = "untitled.txt";
+    else
+        shownName = strippedName(curFile);
+
+    setWindowTitle(tr("%1[*] - %2").arg(shownName).arg(tr("Application")));
+}
+//! [47]
+
+//! [48]
+QString MainWindow::strippedName(const QString &fullFileName)
+//! [48] //! [49]
+{
+    return QFileInfo(fullFileName).fileName();
+}
+//! [49]