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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">mainwindow.cpp Example File<br /><small><small>mainwindows/recentfiles/mainwindow.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

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** not clear to you.

** 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"

MainWindow::MainWindow()

{

setAttribute(Qt::WA_DeleteOnClose);

textEdit = new QTextEdit;

setCentralWidget(textEdit);

createActions();

createMenus();

(void)statusBar();

setWindowTitle(tr("Recent Files"));

resize(400, 300);

}

void MainWindow::newFile()

{

MainWindow *other = new MainWindow;

other->show();

}

void MainWindow::open()

{

QString fileName = QFileDialog::getOpenFileName(this);

if (!fileName.isEmpty())

loadFile(fileName);

}

void MainWindow::save()

{

if (curFile.isEmpty())

saveAs();

else

saveFile(curFile);

}

void MainWindow::saveAs()

{

QString fileName = QFileDialog::getSaveFileName(this);

if (fileName.isEmpty())

return;

if (QFile::exists(fileName)) {

int ret = QMessageBox::warning(this, tr("Recent Files"),

tr("File %1 already exists.\n"

"Do you want to overwrite it?")

.arg(QDir::convertSeparators(fileName)),

QMessageBox::Yes | QMessageBox::Default,

100

QMessageBox::No | QMessageBox::Escape);

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if (ret == QMessageBox::No)

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return;

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}

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saveFile(fileName);

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}

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void MainWindow::openRecentFile()

108

{

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QAction *action = qobject_cast<QAction *>(sender());

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if (action)

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loadFile(action->data().toString());

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}

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void MainWindow::about()

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{

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QMessageBox::about(this, tr("About Recent Files"),

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tr("The <b>Recent Files</b> example demonstrates how to provide a "

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"recently used file menu in a Qt application."));

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}

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void MainWindow::createActions()

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{

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newAct = new QAction(tr("&New"), this);

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newAct->setShortcut(tr("Ctrl+N"));

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

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

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openAct = new QAction(tr("&Open..."), this);

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openAct->setShortcut(tr("Ctrl+O"));

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

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

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saveAct = new QAction(tr("&Save"), this);

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saveAct->setShortcut(tr("Ctrl+S"));

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

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

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

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

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

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for (int i = 0; i < MaxRecentFiles; ++i) {

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recentFileActs[i] = new QAction(this);

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recentFileActs[i]->setVisible(false);

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connect(recentFileActs[i], SIGNAL(triggered()),

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this, SLOT(openRecentFile()));

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}

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exitAct = new QAction(tr("&Close"), this);

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exitAct->setShortcut(tr("Ctrl+W"));

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exitAct->setStatusTip(tr("Close this window"));

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connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

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

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exitAct->setShortcut(tr("Ctrl+Q"));

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

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

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

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

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

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

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

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

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}

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void MainWindow::createMenus()

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{

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

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fileMenu->addAction(newAct);

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fileMenu->addAction(openAct);

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fileMenu->addAction(saveAct);

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fileMenu->addAction(saveAsAct);

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separatorAct = fileMenu->addSeparator();

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for (int i = 0; i < MaxRecentFiles; ++i)

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fileMenu->addAction(recentFileActs[i]);

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fileMenu->addSeparator();

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fileMenu->addAction(exitAct);

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updateRecentFileActions();

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menuBar()->addSeparator();

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

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helpMenu->addAction(aboutAct);

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helpMenu->addAction(aboutQtAct);

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}

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void MainWindow::loadFile(const QString &fileName)

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{

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QFile file(fileName);

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if (!file.open(QFile::ReadOnly | QFile::Text)) {

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QMessageBox::warning(this, tr("Recent Files"),

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tr("Cannot read file %1:\n%2.")

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.arg(fileName)

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.arg(file.errorString()));

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return;

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}

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QTextStream in(&file);

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QApplication::setOverrideCursor(Qt::WaitCursor);

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textEdit->setPlainText(in.readAll());

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QApplication::restoreOverrideCursor();

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setCurrentFile(fileName);

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

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}

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void MainWindow::saveFile(const QString &fileName)

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{

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QFile file(fileName);

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if (!file.open(QFile::WriteOnly | QFile::Text)) {

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QMessageBox::warning(this, tr("Recent Files"),

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tr("Cannot write file %1:\n%2.")

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.arg(fileName)

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.arg(file.errorString()));

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return;

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}

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QTextStream out(&file);

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QApplication::setOverrideCursor(Qt::WaitCursor);

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out << textEdit->toPlainText();

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QApplication::restoreOverrideCursor();

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setCurrentFile(fileName);

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

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}

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void MainWindow::setCurrentFile(const QString &fileName)

230

{

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curFile = fileName;

232

if (curFile.isEmpty())

233

setWindowTitle(tr("Recent Files"));

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else

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setWindowTitle(tr("%1 - %2").arg(strippedName(curFile))

236

.arg(tr("Recent Files")));

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QSettings settings("Trolltech", "Recent Files Example");

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QStringList files = settings.value("recentFileList").toStringList();

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files.removeAll(fileName);

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files.prepend(fileName);

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while (files.size() > MaxRecentFiles)

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files.removeLast();

244

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settings.setValue("recentFileList", files);

246

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foreach (QWidget *widget, QApplication::topLevelWidgets()) {

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MainWindow *mainWin = qobject_cast<MainWindow *>(widget);

249

if (mainWin)

250

mainWin->updateRecentFileActions();

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}

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}

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void MainWindow::updateRecentFileActions()

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{

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QSettings settings("Trolltech", "Recent Files Example");

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QStringList files = settings.value("recentFileList").toStringList();

258

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int numRecentFiles = qMin(files.size(), (int)MaxRecentFiles);

260

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for (int i = 0; i < numRecentFiles; ++i) {

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QString text = tr("&%1 %2").arg(i + 1).arg(strippedName(files[i]));

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recentFileActs[i]->setText(text);

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recentFileActs[i]->setData(files[i]);

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recentFileActs[i]->setVisible(true);

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}

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for (int j = numRecentFiles; j < MaxRecentFiles; ++j)

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recentFileActs[j]->setVisible(false);

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separatorAct->setVisible(numRecentFiles > 0);

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}

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QString MainWindow::strippedName(const QString &fullFileName)

274

{

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return QFileInfo(fullFileName).fileName();

276

}</pre>

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