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Diffstat (limited to 'examples/mainwindows/application/mainwindow.cpp')
| -rw-r--r-- | examples/mainwindows/application/mainwindow.cpp | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/examples/mainwindows/application/mainwindow.cpp b/examples/mainwindows/application/mainwindow.cpp new file mode 100644 index 0000000..9a22254 --- /dev/null +++ b/examples/mainwindows/application/mainwindow.cpp @@ -0,0 +1,388 @@ +/**************************************************************************** +** +** 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] |