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Diffstat (limited to 'examples/mainwindows/sdi/mainwindow.cpp')
| -rw-r--r-- | examples/mainwindows/sdi/mainwindow.cpp | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/examples/mainwindows/sdi/mainwindow.cpp b/examples/mainwindows/sdi/mainwindow.cpp new file mode 100644 index 0000000000..61d63b32ff --- /dev/null +++ b/examples/mainwindows/sdi/mainwindow.cpp @@ -0,0 +1,375 @@ +/**************************************************************************** +** +** 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. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui> + +#include "mainwindow.h" + +MainWindow::MainWindow() +{ + init(); + setCurrentFile(""); +} + +MainWindow::MainWindow(const QString &fileName) +{ + init(); + loadFile(fileName); +} + +void MainWindow::closeEvent(QCloseEvent *event) +{ + if (maybeSave()) { + writeSettings(); + event->accept(); + } else { + event->ignore(); + } +} + +void MainWindow::newFile() +{ + MainWindow *other = new MainWindow; + other->move(x() + 40, y() + 40); + other->show(); +} + +void MainWindow::open() +{ + QString fileName = QFileDialog::getOpenFileName(this); + if (!fileName.isEmpty()) { + MainWindow *existing = findMainWindow(fileName); + if (existing) { + existing->show(); + existing->raise(); + existing->activateWindow(); + return; + } + + if (isUntitled && textEdit->document()->isEmpty() + && !isWindowModified()) { + loadFile(fileName); + } else { + MainWindow *other = new MainWindow(fileName); + if (other->isUntitled) { + delete other; + return; + } + other->move(x() + 40, y() + 40); + other->show(); + } + } +} + +bool MainWindow::save() +{ + if (isUntitled) { + return saveAs(); + } else { + return saveFile(curFile); + } +} + +bool MainWindow::saveAs() +{ + QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), + curFile); + if (fileName.isEmpty()) + return false; + + return saveFile(fileName); +} + +void MainWindow::about() +{ + QMessageBox::about(this, tr("About SDI"), + tr("The <b>SDI</b> example demonstrates how to write single " + "document interface applications using Qt.")); +} + +void MainWindow::documentWasModified() +{ + setWindowModified(true); +} + +void MainWindow::init() +{ + setAttribute(Qt::WA_DeleteOnClose); + + isUntitled = true; + + textEdit = new QTextEdit; + setCentralWidget(textEdit); + + createActions(); + createMenus(); + createToolBars(); + createStatusBar(); + + readSettings(); + + connect(textEdit->document(), SIGNAL(contentsChanged()), + this, SLOT(documentWasModified())); + + setUnifiedTitleAndToolBarOnMac(true); +} + +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())); + + closeAct = new QAction(tr("&Close"), this); + closeAct->setShortcut(tr("Ctrl+W")); + closeAct->setStatusTip(tr("Close this window")); + connect(closeAct, SIGNAL(triggered()), this, SLOT(close())); + + exitAct = new QAction(tr("E&xit"), this); + exitAct->setShortcut(tr("Ctrl+Q")); + 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()), 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())); + + aboutQtAct = new QAction(tr("About &Qt"), this); + aboutQtAct->setStatusTip(tr("Show the Qt library's About box")); + connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt())); + + + cutAct->setEnabled(false); + copyAct->setEnabled(false); + connect(textEdit, SIGNAL(copyAvailable(bool)), + cutAct, SLOT(setEnabled(bool))); + connect(textEdit, SIGNAL(copyAvailable(bool)), + copyAct, SLOT(setEnabled(bool))); +} + +//! [implicit tr context] +void MainWindow::createMenus() +{ + fileMenu = menuBar()->addMenu(tr("&File")); +//! [implicit tr context] + fileMenu->addAction(newAct); + fileMenu->addAction(openAct); + fileMenu->addAction(saveAct); + fileMenu->addAction(saveAsAct); + fileMenu->addSeparator(); + fileMenu->addAction(closeAct); + 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); +} + +void MainWindow::createToolBars() +{ +//! [0] + fileToolBar = addToolBar(tr("File")); + fileToolBar->addAction(newAct); + fileToolBar->addAction(openAct); +//! [0] + 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", "SDI 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", "SDI Example"); + settings.setValue("pos", pos()); + settings.setValue("size", size()); +} + +bool MainWindow::maybeSave() +{ + if (textEdit->document()->isModified()) { + QMessageBox::StandardButton ret; + ret = QMessageBox::warning(this, tr("SDI"), + 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; +} + +void MainWindow::loadFile(const QString &fileName) +{ + + QFile file(fileName); + if (!file.open(QFile::ReadOnly | QFile::Text)) { + QMessageBox::warning(this, tr("SDI"), + 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); +} + +bool MainWindow::saveFile(const QString &fileName) +{ + QFile file(fileName); + if (!file.open(QFile::WriteOnly | QFile::Text)) { + QMessageBox::warning(this, tr("SDI"), + 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; +} + +void MainWindow::setCurrentFile(const QString &fileName) +{ + static int sequenceNumber = 1; + + isUntitled = fileName.isEmpty(); + if (isUntitled) { + curFile = tr("document%1.txt").arg(sequenceNumber++); + } else { + curFile = QFileInfo(fileName).canonicalFilePath(); + } + + textEdit->document()->setModified(false); + setWindowModified(false); + + setWindowTitle(tr("%1[*] - %2").arg(strippedName(curFile)) + .arg(tr("SDI"))); +} + +QString MainWindow::strippedName(const QString &fullFileName) +{ + return QFileInfo(fullFileName).fileName(); +} + +MainWindow *MainWindow::findMainWindow(const QString &fileName) +{ + QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath(); + + foreach (QWidget *widget, qApp->topLevelWidgets()) { + MainWindow *mainWin = qobject_cast<MainWindow *>(widget); + if (mainWin && mainWin->curFile == canonicalFilePath) + return mainWin; + } + return 0; +} |