qt6windows7/examples/widgets/mainwindows/mdi/mainwindow.cpp
2023-10-29 23:33:08 +01:00

462 lines
15 KiB
C++

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtWidgets>
#include "mainwindow.h"
#include "mdichild.h"
MainWindow::MainWindow()
: mdiArea(new QMdiArea)
{
mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
mdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
setCentralWidget(mdiArea);
connect(mdiArea, &QMdiArea::subWindowActivated,
this, &MainWindow::updateMenus);
createActions();
createStatusBar();
updateMenus();
readSettings();
setWindowTitle(tr("MDI"));
setUnifiedTitleAndToolBarOnMac(true);
}
void MainWindow::closeEvent(QCloseEvent *event)
{
mdiArea->closeAllSubWindows();
if (mdiArea->currentSubWindow()) {
event->ignore();
} else {
writeSettings();
event->accept();
}
}
void MainWindow::newFile()
{
MdiChild *child = createMdiChild();
child->newFile();
child->show();
}
void MainWindow::open()
{
const QString fileName = QFileDialog::getOpenFileName(this);
if (!fileName.isEmpty())
openFile(fileName);
}
bool MainWindow::openFile(const QString &fileName)
{
if (QMdiSubWindow *existing = findMdiChild(fileName)) {
mdiArea->setActiveSubWindow(existing);
return true;
}
const bool succeeded = loadFile(fileName);
if (succeeded)
statusBar()->showMessage(tr("File loaded"), 2000);
return succeeded;
}
bool MainWindow::loadFile(const QString &fileName)
{
MdiChild *child = createMdiChild();
const bool succeeded = child->loadFile(fileName);
if (succeeded)
child->show();
else
child->close();
MainWindow::prependToRecentFiles(fileName);
return succeeded;
}
static inline QString recentFilesKey() { return QStringLiteral("recentFileList"); }
static inline QString fileKey() { return QStringLiteral("file"); }
static QStringList readRecentFiles(QSettings &settings)
{
QStringList result;
const int count = settings.beginReadArray(recentFilesKey());
for (int i = 0; i < count; ++i) {
settings.setArrayIndex(i);
result.append(settings.value(fileKey()).toString());
}
settings.endArray();
return result;
}
static void writeRecentFiles(const QStringList &files, QSettings &settings)
{
const int count = files.size();
settings.beginWriteArray(recentFilesKey());
for (int i = 0; i < count; ++i) {
settings.setArrayIndex(i);
settings.setValue(fileKey(), files.at(i));
}
settings.endArray();
}
bool MainWindow::hasRecentFiles()
{
QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
const int count = settings.beginReadArray(recentFilesKey());
settings.endArray();
return count > 0;
}
void MainWindow::prependToRecentFiles(const QString &fileName)
{
QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
const QStringList oldRecentFiles = readRecentFiles(settings);
QStringList recentFiles = oldRecentFiles;
recentFiles.removeAll(fileName);
recentFiles.prepend(fileName);
if (oldRecentFiles != recentFiles)
writeRecentFiles(recentFiles, settings);
setRecentFilesVisible(!recentFiles.isEmpty());
}
void MainWindow::setRecentFilesVisible(bool visible)
{
recentFileSubMenuAct->setVisible(visible);
recentFileSeparator->setVisible(visible);
}
void MainWindow::updateRecentFileActions()
{
QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
const QStringList recentFiles = readRecentFiles(settings);
const int count = qMin(int(MaxRecentFiles), recentFiles.size());
int i = 0;
for ( ; i < count; ++i) {
const QString fileName = QFileInfo(recentFiles.at(i)).fileName();
recentFileActs[i]->setText(tr("&%1 %2").arg(i + 1).arg(fileName));
recentFileActs[i]->setData(recentFiles.at(i));
recentFileActs[i]->setVisible(true);
}
for ( ; i < MaxRecentFiles; ++i)
recentFileActs[i]->setVisible(false);
}
void MainWindow::openRecentFile()
{
if (const QAction *action = qobject_cast<const QAction *>(sender()))
openFile(action->data().toString());
}
void MainWindow::save()
{
if (activeMdiChild() && activeMdiChild()->save())
statusBar()->showMessage(tr("File saved"), 2000);
}
void MainWindow::saveAs()
{
MdiChild *child = activeMdiChild();
if (child && child->saveAs()) {
statusBar()->showMessage(tr("File saved"), 2000);
MainWindow::prependToRecentFiles(child->currentFile());
}
}
#ifndef QT_NO_CLIPBOARD
void MainWindow::cut()
{
if (activeMdiChild())
activeMdiChild()->cut();
}
void MainWindow::copy()
{
if (activeMdiChild())
activeMdiChild()->copy();
}
void MainWindow::paste()
{
if (activeMdiChild())
activeMdiChild()->paste();
}
#endif
void MainWindow::about()
{
QMessageBox::about(this, tr("About MDI"),
tr("The <b>MDI</b> example demonstrates how to write multiple "
"document interface applications using Qt."));
}
void MainWindow::updateMenus()
{
bool hasMdiChild = (activeMdiChild() != nullptr);
saveAct->setEnabled(hasMdiChild);
saveAsAct->setEnabled(hasMdiChild);
#ifndef QT_NO_CLIPBOARD
pasteAct->setEnabled(hasMdiChild);
#endif
closeAct->setEnabled(hasMdiChild);
closeAllAct->setEnabled(hasMdiChild);
tileAct->setEnabled(hasMdiChild);
cascadeAct->setEnabled(hasMdiChild);
nextAct->setEnabled(hasMdiChild);
previousAct->setEnabled(hasMdiChild);
windowMenuSeparatorAct->setVisible(hasMdiChild);
#ifndef QT_NO_CLIPBOARD
bool hasSelection = (activeMdiChild() &&
activeMdiChild()->textCursor().hasSelection());
cutAct->setEnabled(hasSelection);
copyAct->setEnabled(hasSelection);
#endif
}
void MainWindow::updateWindowMenu()
{
windowMenu->clear();
windowMenu->addAction(closeAct);
windowMenu->addAction(closeAllAct);
windowMenu->addSeparator();
windowMenu->addAction(tileAct);
windowMenu->addAction(cascadeAct);
windowMenu->addSeparator();
windowMenu->addAction(nextAct);
windowMenu->addAction(previousAct);
windowMenu->addAction(windowMenuSeparatorAct);
QList<QMdiSubWindow *> windows = mdiArea->subWindowList();
windowMenuSeparatorAct->setVisible(!windows.isEmpty());
for (int i = 0; i < windows.size(); ++i) {
QMdiSubWindow *mdiSubWindow = windows.at(i);
MdiChild *child = qobject_cast<MdiChild *>(mdiSubWindow->widget());
QString text;
if (i < 9) {
text = tr("&%1 %2").arg(i + 1)
.arg(child->userFriendlyCurrentFile());
} else {
text = tr("%1 %2").arg(i + 1)
.arg(child->userFriendlyCurrentFile());
}
QAction *action = windowMenu->addAction(text, mdiSubWindow, [this, mdiSubWindow]() {
mdiArea->setActiveSubWindow(mdiSubWindow);
});
action->setCheckable(true);
action ->setChecked(child == activeMdiChild());
}
}
MdiChild *MainWindow::createMdiChild()
{
MdiChild *child = new MdiChild;
mdiArea->addSubWindow(child);
#ifndef QT_NO_CLIPBOARD
connect(child, &QTextEdit::copyAvailable, cutAct, &QAction::setEnabled);
connect(child, &QTextEdit::copyAvailable, copyAct, &QAction::setEnabled);
#endif
return child;
}
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"));
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"));
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);
fileToolBar->addAction(saveAct);
const QIcon saveAsIcon = QIcon::fromTheme("document-save-as");
saveAsAct = new QAction(saveAsIcon, tr("Save &As..."), this);
saveAsAct->setShortcuts(QKeySequence::SaveAs);
saveAsAct->setStatusTip(tr("Save the document under a new name"));
connect(saveAsAct, &QAction::triggered, this, &MainWindow::saveAs);
fileMenu->addAction(saveAsAct);
fileMenu->addSeparator();
QMenu *recentMenu = fileMenu->addMenu(tr("Recent..."));
connect(recentMenu, &QMenu::aboutToShow, this, &MainWindow::updateRecentFileActions);
recentFileSubMenuAct = recentMenu->menuAction();
for (int i = 0; i < MaxRecentFiles; ++i) {
recentFileActs[i] = recentMenu->addAction(QString(), this, &MainWindow::openRecentFile);
recentFileActs[i]->setVisible(false);
}
recentFileSeparator = fileMenu->addSeparator();
setRecentFilesVisible(MainWindow::hasRecentFiles());
fileMenu->addAction(tr("Switch layout direction"), this, &MainWindow::switchLayoutDirection);
fileMenu->addSeparator();
//! [0]
const QIcon exitIcon = QIcon::fromTheme("application-exit");
QAction *exitAct = fileMenu->addAction(exitIcon, tr("E&xit"), qApp, &QApplication::quit);
exitAct->setShortcuts(QKeySequence::Quit);
exitAct->setStatusTip(tr("Exit the application"));
fileMenu->addAction(exitAct);
//! [0]
#ifndef QT_NO_CLIPBOARD
QMenu *editMenu = menuBar()->addMenu(tr("&Edit"));
QToolBar *editToolBar = addToolBar(tr("Edit"));
const QIcon cutIcon = QIcon::fromTheme("edit-cut", QIcon(":/images/cut.png"));
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, this, &MainWindow::cut);
editMenu->addAction(cutAct);
editToolBar->addAction(cutAct);
const QIcon copyIcon = QIcon::fromTheme("edit-copy", QIcon(":/images/copy.png"));
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, this, &MainWindow::copy);
editMenu->addAction(copyAct);
editToolBar->addAction(copyAct);
const QIcon pasteIcon = QIcon::fromTheme("edit-paste", QIcon(":/images/paste.png"));
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, this, &MainWindow::paste);
editMenu->addAction(pasteAct);
editToolBar->addAction(pasteAct);
#endif
windowMenu = menuBar()->addMenu(tr("&Window"));
connect(windowMenu, &QMenu::aboutToShow, this, &MainWindow::updateWindowMenu);
closeAct = new QAction(tr("Cl&ose"), this);
closeAct->setStatusTip(tr("Close the active window"));
connect(closeAct, &QAction::triggered,
mdiArea, &QMdiArea::closeActiveSubWindow);
closeAllAct = new QAction(tr("Close &All"), this);
closeAllAct->setStatusTip(tr("Close all the windows"));
connect(closeAllAct, &QAction::triggered, mdiArea, &QMdiArea::closeAllSubWindows);
tileAct = new QAction(tr("&Tile"), this);
tileAct->setStatusTip(tr("Tile the windows"));
connect(tileAct, &QAction::triggered, mdiArea, &QMdiArea::tileSubWindows);
cascadeAct = new QAction(tr("&Cascade"), this);
cascadeAct->setStatusTip(tr("Cascade the windows"));
connect(cascadeAct, &QAction::triggered, mdiArea, &QMdiArea::cascadeSubWindows);
nextAct = new QAction(tr("Ne&xt"), this);
nextAct->setShortcuts(QKeySequence::NextChild);
nextAct->setStatusTip(tr("Move the focus to the next window"));
connect(nextAct, &QAction::triggered, mdiArea, &QMdiArea::activateNextSubWindow);
previousAct = new QAction(tr("Pre&vious"), this);
previousAct->setShortcuts(QKeySequence::PreviousChild);
previousAct->setStatusTip(tr("Move the focus to the previous "
"window"));
connect(previousAct, &QAction::triggered, mdiArea, &QMdiArea::activatePreviousSubWindow);
windowMenuSeparatorAct = new QAction(this);
windowMenuSeparatorAct->setSeparator(true);
updateWindowMenu();
menuBar()->addSeparator();
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"));
}
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());
}
MdiChild *MainWindow::activeMdiChild() const
{
if (QMdiSubWindow *activeSubWindow = mdiArea->activeSubWindow())
return qobject_cast<MdiChild *>(activeSubWindow->widget());
return nullptr;
}
QMdiSubWindow *MainWindow::findMdiChild(const QString &fileName) const
{
QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();
const QList<QMdiSubWindow *> subWindows = mdiArea->subWindowList();
for (QMdiSubWindow *window : subWindows) {
MdiChild *mdiChild = qobject_cast<MdiChild *>(window->widget());
if (mdiChild->currentFile() == canonicalFilePath)
return window;
}
return nullptr;
}
void MainWindow::switchLayoutDirection()
{
if (layoutDirection() == Qt::LeftToRight)
QGuiApplication::setLayoutDirection(Qt::RightToLeft);
else
QGuiApplication::setLayoutDirection(Qt::LeftToRight);
}