393 lines
11 KiB
C++
393 lines
11 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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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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** You may use this file under the terms of the BSD license 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 Digia Plc and its Subsidiary(-ies) nor the names
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** of its 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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//! [1] //! [2]
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{
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textEdit = new QPlainTextEdit;
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setCentralWidget(textEdit);
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createActions();
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createMenus();
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createToolBars();
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createStatusBar();
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readSettings();
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connect(textEdit->document(), SIGNAL(contentsChanged()),
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this, SLOT(documentWasModified()));
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setCurrentFile("");
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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("");
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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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QString fileName = QFileDialog::getSaveFileName(this);
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if (fileName.isEmpty())
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return false;
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return saveFile(fileName);
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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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newAct = new QAction(QIcon(":/images/new.png"), 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, SIGNAL(triggered()), this, SLOT(newFile()));
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//! [19]
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openAct = new QAction(QIcon(":/images/open.png"), 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, SIGNAL(triggered()), this, SLOT(open()));
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//! [18] //! [19]
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saveAct = new QAction(QIcon(":/images/save.png"), 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, SIGNAL(triggered()), this, SLOT(save()));
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saveAsAct = new QAction(tr("Save &As..."), this);
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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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connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
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//! [20]
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exitAct = new QAction(tr("E&xit"), this);
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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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connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
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//! [21]
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cutAct = new QAction(QIcon(":/images/cut.png"), 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, SIGNAL(triggered()), textEdit, SLOT(cut()));
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copyAct = new QAction(QIcon(":/images/copy.png"), 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, SIGNAL(triggered()), textEdit, SLOT(copy()));
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pasteAct = new QAction(QIcon(":/images/paste.png"), 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, SIGNAL(triggered()), textEdit, SLOT(paste()));
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aboutAct = new QAction(tr("&About"), this);
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aboutAct->setStatusTip(tr("Show the application's About box"));
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connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
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//! [22]
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aboutQtAct = new QAction(tr("About &Qt"), this);
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aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
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connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
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//! [22]
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//! [23]
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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, SIGNAL(copyAvailable(bool)),
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cutAct, SLOT(setEnabled(bool)));
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connect(textEdit, SIGNAL(copyAvailable(bool)),
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copyAct, SLOT(setEnabled(bool)));
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}
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//! [24]
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//! [25] //! [26]
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void MainWindow::createMenus()
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//! [25] //! [27]
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{
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fileMenu = menuBar()->addMenu(tr("&File"));
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fileMenu->addAction(newAct);
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//! [28]
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fileMenu->addAction(openAct);
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//! [28]
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fileMenu->addAction(saveAct);
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//! [26]
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fileMenu->addAction(saveAsAct);
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fileMenu->addSeparator();
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fileMenu->addAction(exitAct);
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editMenu = menuBar()->addMenu(tr("&Edit"));
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editMenu->addAction(cutAct);
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editMenu->addAction(copyAct);
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editMenu->addAction(pasteAct);
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menuBar()->addSeparator();
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helpMenu = menuBar()->addMenu(tr("&Help"));
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helpMenu->addAction(aboutAct);
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helpMenu->addAction(aboutQtAct);
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}
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//! [27]
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//! [29] //! [30]
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void MainWindow::createToolBars()
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{
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fileToolBar = addToolBar(tr("File"));
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fileToolBar->addAction(newAct);
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//! [29] //! [31]
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fileToolBar->addAction(openAct);
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//! [31]
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fileToolBar->addAction(saveAct);
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editToolBar = addToolBar(tr("Edit"));
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editToolBar->addAction(cutAct);
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editToolBar->addAction(copyAct);
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editToolBar->addAction(pasteAct);
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}
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//! [30]
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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("QtProject", "Application Example");
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QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
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QSize size = settings.value("size", QSize(400, 400)).toSize();
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resize(size);
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move(pos);
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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("QtProject", "Application Example");
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settings.setValue("pos", pos());
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settings.setValue("size", size());
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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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QMessageBox::StandardButton ret;
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ret = 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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if (ret == QMessageBox::Save)
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return save();
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else if (ret == QMessageBox::Cancel)
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return false;
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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(fileName)
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.arg(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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QApplication::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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QApplication::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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QFile file(fileName);
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if (!file.open(QFile::WriteOnly | QFile::Text)) {
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QMessageBox::warning(this, tr("Application"),
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tr("Cannot write file %1:\n%2.")
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.arg(fileName)
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.arg(file.errorString()));
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return false;
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}
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QTextStream out(&file);
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#ifndef QT_NO_CURSOR
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QApplication::setOverrideCursor(Qt::WaitCursor);
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#endif
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out << textEdit->toPlainText();
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#ifndef QT_NO_CURSOR
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QApplication::restoreOverrideCursor();
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#endif
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setCurrentFile(fileName);
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statusBar()->showMessage(tr("File saved"), 2000);
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return true;
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}
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//! [45]
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//! [46]
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void MainWindow::setCurrentFile(const QString &fileName)
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//! [46] //! [47]
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{
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curFile = fileName;
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textEdit->document()->setModified(false);
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setWindowModified(false);
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QString shownName = curFile;
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if (curFile.isEmpty())
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shownName = "untitled.txt";
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setWindowFilePath(shownName);
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}
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//! [47]
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//! [48]
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QString MainWindow::strippedName(const QString &fullFileName)
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//! [48] //! [49]
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{
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return QFileInfo(fullFileName).fileName();
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}
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//! [49]
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