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Diffstat (limited to 'tests/manual/examples/widgets/application/mainwindow.cpp')
-rw-r--r-- | tests/manual/examples/widgets/application/mainwindow.cpp | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/application/mainwindow.cpp b/tests/manual/examples/widgets/application/mainwindow.cpp new file mode 100644 index 0000000000..fcb5590751 --- /dev/null +++ b/tests/manual/examples/widgets/application/mainwindow.cpp @@ -0,0 +1,306 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include <QtWidgets> + +#include "mainwindow.h" + +MainWindow::MainWindow() + : textEdit(new QPlainTextEdit) +{ + setCentralWidget(textEdit); + + createActions(); + createStatusBar(); + + readSettings(); + + connect(textEdit->document(), &QTextDocument::contentsChanged, + this, &MainWindow::documentWasModified); + +#ifndef QT_NO_SESSIONMANAGER + connect(qApp, &QGuiApplication::commitDataRequest, + this, &MainWindow::commitData); +#endif + + setCurrentFile(QString()); + setUnifiedTitleAndToolBarOnMac(true); +} + +void MainWindow::closeEvent(QCloseEvent *event) +{ + if (maybeSave()) { + writeSettings(); + event->accept(); + } else { + event->ignore(); + } +} + +void MainWindow::newFile() +{ + if (maybeSave()) { + textEdit->clear(); + setCurrentFile(QString()); + } +} + +void MainWindow::open() +{ + if (maybeSave()) { + QString fileName = QFileDialog::getOpenFileName(this); + if (!fileName.isEmpty()) + loadFile(fileName); + } +} + +bool MainWindow::save() +{ + if (curFile.isEmpty()) { + return saveAs(); + } else { + return saveFile(curFile); + } +} + +bool MainWindow::saveAs() +{ + QFileDialog dialog(this); + dialog.setWindowModality(Qt::WindowModal); + dialog.setAcceptMode(QFileDialog::AcceptSave); + if (dialog.exec() != QDialog::Accepted) + return false; + return saveFile(dialog.selectedFiles().first()); +} + +void MainWindow::about() +{ + 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.")); +} + +void MainWindow::documentWasModified() +{ + setWindowModified(textEdit->document()->isModified()); +} + +void MainWindow::createActions() +{ + + 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); + + 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); + + 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")); + + fileMenu->addSeparator(); + + const QIcon exitIcon = QIcon::fromTheme("application-exit"); + QAction *exitAct = fileMenu->addAction(exitIcon, tr("E&xit"), this, &QWidget::close); + exitAct->setShortcuts(QKeySequence::Quit); + exitAct->setStatusTip(tr("Exit the application")); + + 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); + 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")); + + QAction *aboutQtAct = helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt); + aboutQtAct->setStatusTip(tr("Show the Qt library's About box")); + +#ifndef QT_NO_CLIPBOARD + cutAct->setEnabled(false); + copyAct->setEnabled(false); + connect(textEdit, &QPlainTextEdit::copyAvailable, cutAct, &QAction::setEnabled); + connect(textEdit, &QPlainTextEdit::copyAvailable, copyAct, &QAction::setEnabled); +#endif // !QT_NO_CLIPBOARD +} + +void MainWindow::createStatusBar() +{ + statusBar()->showMessage(tr("Ready")); +} + +void MainWindow::readSettings() +{ + 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); + } +} + +void MainWindow::writeSettings() +{ + QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName()); + settings.setValue("geometry", saveGeometry()); +} + +bool MainWindow::maybeSave() +{ + 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; +} + +void MainWindow::loadFile(const QString &fileName) +{ + 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); +} + +bool MainWindow::saveFile(const QString &fileName) +{ + 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; +} + +void MainWindow::setCurrentFile(const QString &fileName) +{ + curFile = fileName; + textEdit->document()->setModified(false); + setWindowModified(false); + + QString shownName = curFile; + if (curFile.isEmpty()) + shownName = "untitled.txt"; + setWindowFilePath(shownName); +} + +QString MainWindow::strippedName(const QString &fullFileName) +{ + return QFileInfo(fullFileName).fileName(); +} + +#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 |