419 lines
13 KiB
C++
419 lines
13 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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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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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** 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 The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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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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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//! [0]
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#include <QtWidgets>
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#include "mainwindow.h"
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//! [0]
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//! [1]
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MainWindow::MainWindow()
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: textEdit(new QPlainTextEdit)
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//! [1] //! [2]
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{
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setCentralWidget(textEdit);
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createActions();
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createStatusBar();
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readSettings();
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connect(textEdit->document(), &QTextDocument::contentsChanged,
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this, &MainWindow::documentWasModified);
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#ifndef QT_NO_SESSIONMANAGER
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QGuiApplication::setFallbackSessionManagementEnabled(false);
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connect(qApp, &QGuiApplication::commitDataRequest,
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this, &MainWindow::commitData);
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#endif
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setCurrentFile(QString());
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setUnifiedTitleAndToolBarOnMac(true);
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}
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//! [2]
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//! [3]
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void MainWindow::closeEvent(QCloseEvent *event)
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//! [3] //! [4]
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{
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if (maybeSave()) {
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writeSettings();
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event->accept();
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} else {
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event->ignore();
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}
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}
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//! [4]
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//! [5]
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void MainWindow::newFile()
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//! [5] //! [6]
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{
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if (maybeSave()) {
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textEdit->clear();
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setCurrentFile(QString());
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}
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}
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//! [6]
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//! [7]
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void MainWindow::open()
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//! [7] //! [8]
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{
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if (maybeSave()) {
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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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}
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//! [8]
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//! [9]
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bool MainWindow::save()
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//! [9] //! [10]
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{
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if (curFile.isEmpty()) {
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return saveAs();
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} else {
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return saveFile(curFile);
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}
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}
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//! [10]
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//! [11]
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bool MainWindow::saveAs()
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//! [11] //! [12]
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{
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QFileDialog dialog(this);
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dialog.setWindowModality(Qt::WindowModal);
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dialog.setAcceptMode(QFileDialog::AcceptSave);
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if (dialog.exec() != QDialog::Accepted)
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return false;
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return saveFile(dialog.selectedFiles().first());
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}
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//! [12]
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//! [13]
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void MainWindow::about()
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//! [13] //! [14]
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{
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QMessageBox::about(this, tr("About Application"),
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tr("The <b>Application</b> example demonstrates how to "
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"write modern GUI applications using Qt, with a menu bar, "
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"toolbars, and a status bar."));
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}
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//! [14]
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//! [15]
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void MainWindow::documentWasModified()
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//! [15] //! [16]
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{
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setWindowModified(textEdit->document()->isModified());
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}
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//! [16]
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//! [17]
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void MainWindow::createActions()
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//! [17] //! [18]
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{
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QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
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QToolBar *fileToolBar = addToolBar(tr("File"));
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const QIcon newIcon = QIcon::fromTheme("document-new", QIcon(":/images/new.png"));
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QAction *newAct = new QAction(newIcon, 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, &QAction::triggered, this, &MainWindow::newFile);
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fileMenu->addAction(newAct);
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fileToolBar->addAction(newAct);
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//! [19]
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const QIcon openIcon = QIcon::fromTheme("document-open", QIcon(":/images/open.png"));
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QAction *openAct = new QAction(openIcon, 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, &QAction::triggered, this, &MainWindow::open);
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fileMenu->addAction(openAct);
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fileToolBar->addAction(openAct);
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//! [18] //! [19]
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const QIcon saveIcon = QIcon::fromTheme("document-save", QIcon(":/images/save.png"));
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QAction *saveAct = new QAction(saveIcon, 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, &QAction::triggered, this, &MainWindow::save);
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fileMenu->addAction(saveAct);
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fileToolBar->addAction(saveAct);
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const QIcon saveAsIcon = QIcon::fromTheme("document-save-as");
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QAction *saveAsAct = fileMenu->addAction(saveAsIcon, tr("Save &As..."), this, &MainWindow::saveAs);
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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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//! [20]
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fileMenu->addSeparator();
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const QIcon exitIcon = QIcon::fromTheme("application-exit");
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QAction *exitAct = fileMenu->addAction(exitIcon, tr("E&xit"), this, &QWidget::close);
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exitAct->setShortcuts(QKeySequence::Quit);
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//! [20]
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exitAct->setStatusTip(tr("Exit the application"));
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//! [21]
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QMenu *editMenu = menuBar()->addMenu(tr("&Edit"));
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QToolBar *editToolBar = addToolBar(tr("Edit"));
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//!
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#ifndef QT_NO_CLIPBOARD
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const QIcon cutIcon = QIcon::fromTheme("edit-cut", QIcon(":/images/cut.png"));
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QAction *cutAct = new QAction(cutIcon, tr("Cu&t"), this);
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//! [21]
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cutAct->setShortcuts(QKeySequence::Cut);
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cutAct->setStatusTip(tr("Cut the current selection's contents to the "
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"clipboard"));
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connect(cutAct, &QAction::triggered, textEdit, &QPlainTextEdit::cut);
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editMenu->addAction(cutAct);
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editToolBar->addAction(cutAct);
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const QIcon copyIcon = QIcon::fromTheme("edit-copy", QIcon(":/images/copy.png"));
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QAction *copyAct = new QAction(copyIcon, tr("&Copy"), this);
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copyAct->setShortcuts(QKeySequence::Copy);
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copyAct->setStatusTip(tr("Copy the current selection's contents to the "
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"clipboard"));
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connect(copyAct, &QAction::triggered, textEdit, &QPlainTextEdit::copy);
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editMenu->addAction(copyAct);
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editToolBar->addAction(copyAct);
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const QIcon pasteIcon = QIcon::fromTheme("edit-paste", QIcon(":/images/paste.png"));
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QAction *pasteAct = new QAction(pasteIcon, tr("&Paste"), this);
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pasteAct->setShortcuts(QKeySequence::Paste);
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pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
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"selection"));
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connect(pasteAct, &QAction::triggered, textEdit, &QPlainTextEdit::paste);
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editMenu->addAction(pasteAct);
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editToolBar->addAction(pasteAct);
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menuBar()->addSeparator();
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#endif // !QT_NO_CLIPBOARD
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QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
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QAction *aboutAct = helpMenu->addAction(tr("&About"), this, &MainWindow::about);
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aboutAct->setStatusTip(tr("Show the application's About box"));
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//! [22]
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QAction *aboutQtAct = helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt);
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aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
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//! [22]
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//! [23]
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#ifndef QT_NO_CLIPBOARD
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cutAct->setEnabled(false);
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//! [23] //! [24]
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copyAct->setEnabled(false);
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connect(textEdit, &QPlainTextEdit::copyAvailable, cutAct, &QAction::setEnabled);
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connect(textEdit, &QPlainTextEdit::copyAvailable, copyAct, &QAction::setEnabled);
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#endif // !QT_NO_CLIPBOARD
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}
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//! [24]
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//! [32]
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void MainWindow::createStatusBar()
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//! [32] //! [33]
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{
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statusBar()->showMessage(tr("Ready"));
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}
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//! [33]
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//! [34] //! [35]
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void MainWindow::readSettings()
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//! [34] //! [36]
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{
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QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
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const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
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if (geometry.isEmpty()) {
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const QRect availableGeometry = screen()->availableGeometry();
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resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
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move((availableGeometry.width() - width()) / 2,
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(availableGeometry.height() - height()) / 2);
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} else {
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restoreGeometry(geometry);
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}
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}
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//! [35] //! [36]
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//! [37] //! [38]
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void MainWindow::writeSettings()
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//! [37] //! [39]
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{
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QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
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settings.setValue("geometry", saveGeometry());
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}
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//! [38] //! [39]
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//! [40]
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bool MainWindow::maybeSave()
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//! [40] //! [41]
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{
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if (!textEdit->document()->isModified())
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return true;
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const QMessageBox::StandardButton ret
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= QMessageBox::warning(this, tr("Application"),
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tr("The document has been modified.\n"
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"Do you want to save your changes?"),
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QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
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switch (ret) {
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case QMessageBox::Save:
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return save();
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case QMessageBox::Cancel:
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return false;
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default:
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break;
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}
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return true;
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}
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//! [41]
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//! [42]
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void MainWindow::loadFile(const QString &fileName)
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//! [42] //! [43]
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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("Application"),
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tr("Cannot read file %1:\n%2.")
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.arg(QDir::toNativeSeparators(fileName), file.errorString()));
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return;
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}
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QTextStream in(&file);
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#ifndef QT_NO_CURSOR
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QGuiApplication::setOverrideCursor(Qt::WaitCursor);
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#endif
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textEdit->setPlainText(in.readAll());
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#ifndef QT_NO_CURSOR
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QGuiApplication::restoreOverrideCursor();
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#endif
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setCurrentFile(fileName);
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statusBar()->showMessage(tr("File loaded"), 2000);
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}
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//! [43]
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//! [44]
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bool MainWindow::saveFile(const QString &fileName)
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//! [44] //! [45]
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{
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QString errorMessage;
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QGuiApplication::setOverrideCursor(Qt::WaitCursor);
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QSaveFile file(fileName);
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if (file.open(QFile::WriteOnly | QFile::Text)) {
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QTextStream out(&file);
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out << textEdit->toPlainText();
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if (!file.commit()) {
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errorMessage = tr("Cannot write file %1:\n%2.")
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.arg(QDir::toNativeSeparators(fileName), file.errorString());
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}
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} else {
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errorMessage = tr("Cannot open file %1 for writing:\n%2.")
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.arg(QDir::toNativeSeparators(fileName), file.errorString());
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}
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QGuiApplication::restoreOverrideCursor();
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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
|