252 lines
8.0 KiB
C++
252 lines
8.0 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtGui>
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#include "mainwindow.h"
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MainWindow::MainWindow()
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{
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setAttribute(Qt::WA_DeleteOnClose);
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textEdit = new QTextEdit;
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setCentralWidget(textEdit);
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createActions();
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createMenus();
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(void)statusBar();
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setWindowFilePath(QString());
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resize(400, 300);
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}
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void MainWindow::newFile()
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{
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MainWindow *other = new MainWindow;
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other->show();
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}
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void MainWindow::open()
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{
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QString fileName = QFileDialog::getOpenFileName(this);
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if (!fileName.isEmpty())
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loadFile(fileName);
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}
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void MainWindow::save()
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{
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if (curFile.isEmpty())
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saveAs();
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else
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saveFile(curFile);
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}
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void MainWindow::saveAs()
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{
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QString fileName = QFileDialog::getSaveFileName(this);
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if (fileName.isEmpty())
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return;
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saveFile(fileName);
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}
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void MainWindow::openRecentFile()
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{
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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->setShortcuts(QKeySequence::New);
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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->setShortcuts(QKeySequence::Open);
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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->setShortcuts(QKeySequence::Save);
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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->setShortcuts(QKeySequence::SaveAs);
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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("E&xit"), this);
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exitAct->setShortcuts(QKeySequence::Quit);
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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)
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{
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curFile = fileName;
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setWindowFilePath(curFile);
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QSettings settings;
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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();
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settings.setValue("recentFileList", files);
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foreach (QWidget *widget, QApplication::topLevelWidgets()) {
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MainWindow *mainWin = qobject_cast<MainWindow *>(widget);
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if (mainWin)
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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;
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QStringList files = settings.value("recentFileList").toStringList();
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int numRecentFiles = qMin(files.size(), (int)MaxRecentFiles);
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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)
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{
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return QFileInfo(fullFileName).fileName();
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}
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