mdichild.cpp

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/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#include <memory>
#include <QtWidgets>
#include <QtGlobal>
#include "mdichild.h"
#include "mainwindow.h"
 
MdiChild::MdiChild()
{
    setAttribute(Qt::WA_DeleteOnClose);
    isUntitled = true;
    layoutIdx = 0;
    renderIdx = 0;
    preview = true;
    applyCairo = false;
    settingsSet = false;
}
 
void MdiChild::newFile()
{
    static int sequenceNumber = 1;
 
    isUntitled = true;
    curFile = tr("graph%1.gv").arg(sequenceNumber++);
    setWindowTitle(curFile + QLatin1String("[*]"));
 
    connect(document(), &QTextDocument::contentsChange,
            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);
  QApplication::setOverrideCursor(Qt::WaitCursor);
  setPlainText(in.readAll());
  QApplication::restoreOverrideCursor();
 
  setCurrentFile(fileName);
 
  connect(document(), &QTextDocument::contentsChange,
          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)
{
    QFile file(fileName);
    if (!file.open(QFile::WriteOnly | QFile::Text)) {
        QMessageBox::warning(this, tr("MDI"),
                             tr("Cannot write file %1:\n%2.")
                             .arg(fileName)
                             .arg(file.errorString()));
        return false;
    }
 
    QTextStream out(&file);
    QApplication::setOverrideCursor(Qt::WaitCursor);
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    out.setCodec("UTF-8");
#endif
    out << toPlainText();
    out.flush();
    QApplication::restoreOverrideCursor();
 
    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()) {
        QMessageBox::StandardButton ret;
        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);
        if (ret == QMessageBox::Save)
            return save();
        else if (ret == QMessageBox::Cancel)
            return false;
    }
    return true;
}
 
void MdiChild::setCurrentFile(const QString & fileName)
{
    curFile = QFileInfo(fileName).canonicalFilePath();
    isUntitled = false;
    document()->setModified(false);
    setWindowModified(false);
    setWindowTitle(userFriendlyCurrentFile() + QLatin1String("[*]"));
}
 
QString MdiChild::strippedName(const QString & fullFileName)
{
    return QFileInfo(fullFileName).fileName();
}
 
bool MdiChild::loadPreview(const QString &fileName)
{
    if (previewFrm == nullptr) {
        previewFrm = std::make_unique<ImageViewer>();
        previewFrm->graphWindow = this;
        QMdiSubWindow *s = parentFrm->mdiArea->addSubWindow(previewFrm.get());
 
        s->resize(600, 400);
        s->move(parentFrm->mdiArea->subWindowList().count() * 5,
                parentFrm->mdiArea->subWindowList().count() * 5);
        previewFrm->subWindowRef = s;
 
    }
    bool rv = previewFrm->open(fileName);
    if (rv)
        previewFrm->show();
    return rv;
}
 
bool MdiChild::firstTime()
{
    return settingsSet;
}