| /**************************************************************************** |
| ** |
| ** 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 |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** 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: |
| ** * Redistributions of source code must retain the above copyright |
| ** notice, this list of conditions and the following disclaimer. |
| ** * Redistributions in binary form must reproduce the above copyright |
| ** notice, this list of conditions and the following disclaimer in |
| ** the documentation and/or other materials provided with the |
| ** distribution. |
| ** * Neither the name of The Qt Company Ltd nor the names of its |
| ** contributors may be used to endorse or promote products derived |
| ** from this software without specific prior written permission. |
| ** |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include <QtWidgets> |
| |
| #include "mdichild.h" |
| |
| MdiChild::MdiChild() |
| { |
| setAttribute(Qt::WA_DeleteOnClose); |
| isUntitled = true; |
| } |
| |
| void MdiChild::newFile() |
| { |
| static int sequenceNumber = 1; |
| |
| isUntitled = true; |
| curFile = tr("document%1.txt").arg(sequenceNumber++); |
| setWindowTitle(curFile + "[*]"); |
| |
| connect(document(), &QTextDocument::contentsChanged, |
| this, &MdiChild::documentWasModified); |
| } |
| |
| bool MdiChild::loadFile(const QString &fileName) |
| { |
| QFile file(fileName); |
| if (!file.open(QFile::ReadOnly | QFile::Text)) { |
| QMessageBox::warning(this, tr("MDI"), |
| tr("Cannot read file %1:\n%2.") |
| .arg(fileName) |
| .arg(file.errorString())); |
| return false; |
| } |
| |
| QTextStream in(&file); |
| QGuiApplication::setOverrideCursor(Qt::WaitCursor); |
| setPlainText(in.readAll()); |
| QGuiApplication::restoreOverrideCursor(); |
| |
| setCurrentFile(fileName); |
| |
| connect(document(), &QTextDocument::contentsChanged, |
| this, &MdiChild::documentWasModified); |
| |
| return true; |
| } |
| |
| bool MdiChild::save() |
| { |
| if (isUntitled) { |
| return saveAs(); |
| } else { |
| return saveFile(curFile); |
| } |
| } |
| |
| bool MdiChild::saveAs() |
| { |
| QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), |
| curFile); |
| if (fileName.isEmpty()) |
| return false; |
| |
| return saveFile(fileName); |
| } |
| |
| bool MdiChild::saveFile(const QString &fileName) |
| { |
| QString errorMessage; |
| |
| QGuiApplication::setOverrideCursor(Qt::WaitCursor); |
| QSaveFile file(fileName); |
| if (file.open(QFile::WriteOnly | QFile::Text)) { |
| QTextStream out(&file); |
| out << 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("MDI"), errorMessage); |
| return false; |
| } |
| |
| setCurrentFile(fileName); |
| return true; |
| } |
| |
| QString MdiChild::userFriendlyCurrentFile() |
| { |
| return strippedName(curFile); |
| } |
| |
| void MdiChild::closeEvent(QCloseEvent *event) |
| { |
| if (maybeSave()) { |
| event->accept(); |
| } else { |
| event->ignore(); |
| } |
| } |
| |
| void MdiChild::documentWasModified() |
| { |
| setWindowModified(document()->isModified()); |
| } |
| |
| bool MdiChild::maybeSave() |
| { |
| if (!document()->isModified()) |
| return true; |
| const QMessageBox::StandardButton ret |
| = QMessageBox::warning(this, tr("MDI"), |
| tr("'%1' has been modified.\n" |
| "Do you want to save your changes?") |
| .arg(userFriendlyCurrentFile()), |
| QMessageBox::Save | QMessageBox::Discard |
| | QMessageBox::Cancel); |
| switch (ret) { |
| case QMessageBox::Save: |
| return save(); |
| case QMessageBox::Cancel: |
| return false; |
| default: |
| break; |
| } |
| return true; |
| } |
| |
| void MdiChild::setCurrentFile(const QString &fileName) |
| { |
| curFile = QFileInfo(fileName).canonicalFilePath(); |
| isUntitled = false; |
| document()->setModified(false); |
| setWindowModified(false); |
| setWindowTitle(userFriendlyCurrentFile() + "[*]"); |
| } |
| |
| QString MdiChild::strippedName(const QString &fullFileName) |
| { |
| return QFileInfo(fullFileName).fileName(); |
| } |