| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the examples of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
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| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
| ** "Redistribution and use in source and binary forms, with or without |
| ** modification, are permitted provided that the following conditions are |
| ** met: |
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| ****************************************************************************/ |
| |
| //! [0] |
| #include <QtWidgets> |
| |
| #include "mainwindow.h" |
| //! [0] |
| |
| //! [1] |
| MainWindow::MainWindow() |
| : textEdit(new QPlainTextEdit) |
| //! [1] //! [2] |
| { |
| setCentralWidget(textEdit); |
| |
| createActions(); |
| createStatusBar(); |
| |
| readSettings(); |
| |
| connect(textEdit->document(), &QTextDocument::contentsChanged, |
| this, &MainWindow::documentWasModified); |
| |
| #ifndef QT_NO_SESSIONMANAGER |
| QGuiApplication::setFallbackSessionManagementEnabled(false); |
| connect(qApp, &QGuiApplication::commitDataRequest, |
| this, &MainWindow::commitData); |
| #endif |
| |
| setCurrentFile(QString()); |
| 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(QString()); |
| } |
| } |
| //! [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] |
| { |
| QFileDialog dialog(this); |
| dialog.setWindowModality(Qt::WindowModal); |
| dialog.setAcceptMode(QFileDialog::AcceptSave); |
| if (dialog.exec() != QDialog::Accepted) |
| return false; |
| return saveFile(dialog.selectedFiles().first()); |
| } |
| //! [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] |
| { |
| |
| QMenu *fileMenu = menuBar()->addMenu(tr("&File")); |
| QToolBar *fileToolBar = addToolBar(tr("File")); |
| const QIcon newIcon = QIcon::fromTheme("document-new", QIcon(":/images/new.png")); |
| QAction *newAct = new QAction(newIcon, tr("&New"), this); |
| newAct->setShortcuts(QKeySequence::New); |
| newAct->setStatusTip(tr("Create a new file")); |
| connect(newAct, &QAction::triggered, this, &MainWindow::newFile); |
| fileMenu->addAction(newAct); |
| fileToolBar->addAction(newAct); |
| |
| //! [19] |
| const QIcon openIcon = QIcon::fromTheme("document-open", QIcon(":/images/open.png")); |
| QAction *openAct = new QAction(openIcon, tr("&Open..."), this); |
| openAct->setShortcuts(QKeySequence::Open); |
| openAct->setStatusTip(tr("Open an existing file")); |
| connect(openAct, &QAction::triggered, this, &MainWindow::open); |
| fileMenu->addAction(openAct); |
| fileToolBar->addAction(openAct); |
| //! [18] //! [19] |
| |
| const QIcon saveIcon = QIcon::fromTheme("document-save", QIcon(":/images/save.png")); |
| QAction *saveAct = new QAction(saveIcon, tr("&Save"), this); |
| saveAct->setShortcuts(QKeySequence::Save); |
| saveAct->setStatusTip(tr("Save the document to disk")); |
| connect(saveAct, &QAction::triggered, this, &MainWindow::save); |
| fileMenu->addAction(saveAct); |
| fileToolBar->addAction(saveAct); |
| |
| const QIcon saveAsIcon = QIcon::fromTheme("document-save-as"); |
| QAction *saveAsAct = fileMenu->addAction(saveAsIcon, tr("Save &As..."), this, &MainWindow::saveAs); |
| saveAsAct->setShortcuts(QKeySequence::SaveAs); |
| saveAsAct->setStatusTip(tr("Save the document under a new name")); |
| |
| //! [20] |
| |
| fileMenu->addSeparator(); |
| |
| const QIcon exitIcon = QIcon::fromTheme("application-exit"); |
| QAction *exitAct = fileMenu->addAction(exitIcon, tr("E&xit"), this, &QWidget::close); |
| exitAct->setShortcuts(QKeySequence::Quit); |
| //! [20] |
| exitAct->setStatusTip(tr("Exit the application")); |
| |
| //! [21] |
| QMenu *editMenu = menuBar()->addMenu(tr("&Edit")); |
| QToolBar *editToolBar = addToolBar(tr("Edit")); |
| //! |
| #ifndef QT_NO_CLIPBOARD |
| const QIcon cutIcon = QIcon::fromTheme("edit-cut", QIcon(":/images/cut.png")); |
| QAction *cutAct = new QAction(cutIcon, tr("Cu&t"), this); |
| //! [21] |
| cutAct->setShortcuts(QKeySequence::Cut); |
| cutAct->setStatusTip(tr("Cut the current selection's contents to the " |
| "clipboard")); |
| connect(cutAct, &QAction::triggered, textEdit, &QPlainTextEdit::cut); |
| editMenu->addAction(cutAct); |
| editToolBar->addAction(cutAct); |
| |
| const QIcon copyIcon = QIcon::fromTheme("edit-copy", QIcon(":/images/copy.png")); |
| QAction *copyAct = new QAction(copyIcon, tr("&Copy"), this); |
| copyAct->setShortcuts(QKeySequence::Copy); |
| copyAct->setStatusTip(tr("Copy the current selection's contents to the " |
| "clipboard")); |
| connect(copyAct, &QAction::triggered, textEdit, &QPlainTextEdit::copy); |
| editMenu->addAction(copyAct); |
| editToolBar->addAction(copyAct); |
| |
| const QIcon pasteIcon = QIcon::fromTheme("edit-paste", QIcon(":/images/paste.png")); |
| QAction *pasteAct = new QAction(pasteIcon, tr("&Paste"), this); |
| pasteAct->setShortcuts(QKeySequence::Paste); |
| pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current " |
| "selection")); |
| connect(pasteAct, &QAction::triggered, textEdit, &QPlainTextEdit::paste); |
| editMenu->addAction(pasteAct); |
| editToolBar->addAction(pasteAct); |
| |
| menuBar()->addSeparator(); |
| |
| #endif // !QT_NO_CLIPBOARD |
| |
| QMenu *helpMenu = menuBar()->addMenu(tr("&Help")); |
| QAction *aboutAct = helpMenu->addAction(tr("&About"), this, &MainWindow::about); |
| aboutAct->setStatusTip(tr("Show the application's About box")); |
| |
| //! [22] |
| |
| QAction *aboutQtAct = helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt); |
| aboutQtAct->setStatusTip(tr("Show the Qt library's About box")); |
| //! [22] |
| |
| //! [23] |
| #ifndef QT_NO_CLIPBOARD |
| cutAct->setEnabled(false); |
| //! [23] //! [24] |
| copyAct->setEnabled(false); |
| connect(textEdit, &QPlainTextEdit::copyAvailable, cutAct, &QAction::setEnabled); |
| connect(textEdit, &QPlainTextEdit::copyAvailable, copyAct, &QAction::setEnabled); |
| #endif // !QT_NO_CLIPBOARD |
| } |
| //! [24] |
| |
| //! [32] |
| void MainWindow::createStatusBar() |
| //! [32] //! [33] |
| { |
| statusBar()->showMessage(tr("Ready")); |
| } |
| //! [33] |
| |
| //! [34] //! [35] |
| void MainWindow::readSettings() |
| //! [34] //! [36] |
| { |
| QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName()); |
| const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray(); |
| if (geometry.isEmpty()) { |
| const QRect availableGeometry = screen()->availableGeometry(); |
| resize(availableGeometry.width() / 3, availableGeometry.height() / 2); |
| move((availableGeometry.width() - width()) / 2, |
| (availableGeometry.height() - height()) / 2); |
| } else { |
| restoreGeometry(geometry); |
| } |
| } |
| //! [35] //! [36] |
| |
| //! [37] //! [38] |
| void MainWindow::writeSettings() |
| //! [37] //! [39] |
| { |
| QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName()); |
| settings.setValue("geometry", saveGeometry()); |
| } |
| //! [38] //! [39] |
| |
| //! [40] |
| bool MainWindow::maybeSave() |
| //! [40] //! [41] |
| { |
| if (!textEdit->document()->isModified()) |
| return true; |
| const QMessageBox::StandardButton 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); |
| switch (ret) { |
| case QMessageBox::Save: |
| return save(); |
| case QMessageBox::Cancel: |
| return false; |
| default: |
| break; |
| } |
| 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(QDir::toNativeSeparators(fileName), file.errorString())); |
| return; |
| } |
| |
| QTextStream in(&file); |
| #ifndef QT_NO_CURSOR |
| QGuiApplication::setOverrideCursor(Qt::WaitCursor); |
| #endif |
| textEdit->setPlainText(in.readAll()); |
| #ifndef QT_NO_CURSOR |
| QGuiApplication::restoreOverrideCursor(); |
| #endif |
| |
| setCurrentFile(fileName); |
| statusBar()->showMessage(tr("File loaded"), 2000); |
| } |
| //! [43] |
| |
| //! [44] |
| bool MainWindow::saveFile(const QString &fileName) |
| //! [44] //! [45] |
| { |
| QString errorMessage; |
| |
| QGuiApplication::setOverrideCursor(Qt::WaitCursor); |
| QSaveFile file(fileName); |
| if (file.open(QFile::WriteOnly | QFile::Text)) { |
| QTextStream out(&file); |
| out << textEdit->toPlainText(); |
| if (!file.commit()) { |
| errorMessage = tr("Cannot write file %1:\n%2.") |
| .arg(QDir::toNativeSeparators(fileName), file.errorString()); |
| } |
| } else { |
| errorMessage = tr("Cannot open file %1 for writing:\n%2.") |
| .arg(QDir::toNativeSeparators(fileName), file.errorString()); |
| } |
| QGuiApplication::restoreOverrideCursor(); |
| |
| if (!errorMessage.isEmpty()) { |
| QMessageBox::warning(this, tr("Application"), errorMessage); |
| return false; |
| } |
| |
| 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 = curFile; |
| if (curFile.isEmpty()) |
| shownName = "untitled.txt"; |
| setWindowFilePath(shownName); |
| } |
| //! [47] |
| |
| //! [48] |
| QString MainWindow::strippedName(const QString &fullFileName) |
| //! [48] //! [49] |
| { |
| return QFileInfo(fullFileName).fileName(); |
| } |
| //! [49] |
| #ifndef QT_NO_SESSIONMANAGER |
| void MainWindow::commitData(QSessionManager &manager) |
| { |
| if (manager.allowsInteraction()) { |
| if (!maybeSave()) |
| manager.cancel(); |
| } else { |
| // Non-interactive: save without asking |
| if (textEdit->document()->isModified()) |
| save(); |
| } |
| } |
| #endif |