mainwindow.cpp Example File
mainwindows/mdi/mainwindow.cpp
/****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <QtGui>
#include "mainwindow.h"
#include "mdichild.h"
MainWindow::MainWindow()
{
workspace = new QWorkspace;
setCentralWidget(workspace);
connect(workspace, SIGNAL(windowActivated(QWidget *)),
this, SLOT(updateMenus()));
windowMapper = new QSignalMapper(this);
connect(windowMapper, SIGNAL(mapped(QWidget *)),
workspace, SLOT(setActiveWindow(QWidget *)));
createActions();
createMenus();
createToolBars();
createStatusBar();
updateMenus();
readSettings();
setWindowTitle(tr("MDI"));
}
void MainWindow::closeEvent(QCloseEvent *event)
{
workspace->closeAllWindows();
if (activeMdiChild()) {
event->ignore();
} else {
writeSettings();
event->accept();
}
}
void MainWindow::newFile()
{
MdiChild *child = createMdiChild();
child->newFile();
child->show();
}
void MainWindow::open()
{
QString fileName = QFileDialog::getOpenFileName(this);
if (!fileName.isEmpty()) {
MdiChild *existing = findMdiChild(fileName);
if (existing) {
workspace->setActiveWindow(existing);
return;
}
MdiChild *child = createMdiChild();
if (child->loadFile(fileName)) {
statusBar()->showMessage(tr("File loaded"), 2000);
child->show();
} else {
child->close();
}
}
}
void MainWindow::save()
{
if (activeMdiChild()->save())
statusBar()->showMessage(tr("File saved"), 2000);
}
void MainWindow::saveAs()
{
if (activeMdiChild()->saveAs())
statusBar()->showMessage(tr("File saved"), 2000);
}
void MainWindow::cut()
{
activeMdiChild()->cut();
}
void MainWindow::copy()
{
activeMdiChild()->copy();
}
void MainWindow::paste()
{
activeMdiChild()->paste();
}
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() != 0);
saveAct->setEnabled(hasMdiChild);
saveAsAct->setEnabled(hasMdiChild);
pasteAct->setEnabled(hasMdiChild);
closeAct->setEnabled(hasMdiChild);
closeAllAct->setEnabled(hasMdiChild);
tileAct->setEnabled(hasMdiChild);
cascadeAct->setEnabled(hasMdiChild);
arrangeAct->setEnabled(hasMdiChild);
nextAct->setEnabled(hasMdiChild);
previousAct->setEnabled(hasMdiChild);
separatorAct->setVisible(hasMdiChild);
bool hasSelection = (activeMdiChild() &&
activeMdiChild()->textCursor().hasSelection());
cutAct->setEnabled(hasSelection);
copyAct->setEnabled(hasSelection);
}
void MainWindow::updateWindowMenu()
{
windowMenu->clear();
windowMenu->addAction(closeAct);
windowMenu->addAction(closeAllAct);
windowMenu->addSeparator();
windowMenu->addAction(tileAct);
windowMenu->addAction(cascadeAct);
windowMenu->addAction(arrangeAct);
windowMenu->addSeparator();
windowMenu->addAction(nextAct);
windowMenu->addAction(previousAct);
windowMenu->addAction(separatorAct);
QList<QWidget *> windows = workspace->windowList();
separatorAct->setVisible(!windows.isEmpty());
for (int i = 0; i < windows.size(); ++i) {
MdiChild *child = qobject_cast<MdiChild *>(windows.at(i));
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);
action->setCheckable(true);
action ->setChecked(child == activeMdiChild());
connect(action, SIGNAL(triggered()), windowMapper, SLOT(map()));
windowMapper->setMapping(action, child);
}
}
MdiChild *MainWindow::createMdiChild()
{
MdiChild *child = new MdiChild;
workspace->addWindow(child);
connect(child, SIGNAL(copyAvailable(bool)),
cutAct, SLOT(setEnabled(bool)));
connect(child, SIGNAL(copyAvailable(bool)),
copyAct, SLOT(setEnabled(bool)));
return child;
}
void MainWindow::createActions()
{
newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);
newAct->setShortcut(tr("Ctrl+N"));
newAct->setStatusTip(tr("Create a new file"));
connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);
openAct->setShortcut(tr("Ctrl+O"));
openAct->setStatusTip(tr("Open an existing file"));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);
saveAct->setShortcut(tr("Ctrl+S"));
saveAct->setStatusTip(tr("Save the document to disk"));
connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
saveAsAct = new QAction(tr("Save &As..."), this);
saveAsAct->setStatusTip(tr("Save the document under a new name"));
connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
exitAct->setStatusTip(tr("Exit the application"));
connect(exitAct, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()));
cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);
cutAct->setShortcut(tr("Ctrl+X"));
cutAct->setStatusTip(tr("Cut the current selection's contents to the "
"clipboard"));
connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));
copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);
copyAct->setShortcut(tr("Ctrl+C"));
copyAct->setStatusTip(tr("Copy the current selection's contents to the "
"clipboard"));
connect(copyAct, SIGNAL(triggered()), this, SLOT(copy()));
pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);
pasteAct->setShortcut(tr("Ctrl+V"));
pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
"selection"));
connect(pasteAct, SIGNAL(triggered()), this, SLOT(paste()));
closeAct = new QAction(tr("Cl&ose"), this);
closeAct->setShortcut(tr("Ctrl+F4"));
closeAct->setStatusTip(tr("Close the active window"));
connect(closeAct, SIGNAL(triggered()),
workspace, SLOT(closeActiveWindow()));
closeAllAct = new QAction(tr("Close &All"), this);
closeAllAct->setStatusTip(tr("Close all the windows"));
connect(closeAllAct, SIGNAL(triggered()),
workspace, SLOT(closeAllWindows()));
tileAct = new QAction(tr("&Tile"), this);
tileAct->setStatusTip(tr("Tile the windows"));
connect(tileAct, SIGNAL(triggered()), workspace, SLOT(tile()));
cascadeAct = new QAction(tr("&Cascade"), this);
cascadeAct->setStatusTip(tr("Cascade the windows"));
connect(cascadeAct, SIGNAL(triggered()), workspace, SLOT(cascade()));
arrangeAct = new QAction(tr("Arrange &icons"), this);
arrangeAct->setStatusTip(tr("Arrange the icons"));
connect(arrangeAct, SIGNAL(triggered()), workspace, SLOT(arrangeIcons()));
nextAct = new QAction(tr("Ne&xt"), this);
nextAct->setShortcut(tr("Ctrl+F6"));
nextAct->setStatusTip(tr("Move the focus to the next window"));
connect(nextAct, SIGNAL(triggered()),
workspace, SLOT(activateNextWindow()));
previousAct = new QAction(tr("Pre&vious"), this);
previousAct->setShortcut(tr("Ctrl+Shift+F6"));
previousAct->setStatusTip(tr("Move the focus to the previous "
"window"));
connect(previousAct, SIGNAL(triggered()),
workspace, SLOT(activatePreviousWindow()));
separatorAct = new QAction(this);
separatorAct->setSeparator(true);
aboutAct = new QAction(tr("&About"), this);
aboutAct->setStatusTip(tr("Show the application's About box"));
connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
aboutQtAct = new QAction(tr("About &Qt"), this);
aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
}
void MainWindow::createMenus()
{
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(newAct);
fileMenu->addAction(openAct);
fileMenu->addAction(saveAct);
fileMenu->addAction(saveAsAct);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
editMenu = menuBar()->addMenu(tr("&Edit"));
editMenu->addAction(cutAct);
editMenu->addAction(copyAct);
editMenu->addAction(pasteAct);
windowMenu = menuBar()->addMenu(tr("&Window"));
updateWindowMenu();
connect(windowMenu, SIGNAL(aboutToShow()), this, SLOT(updateWindowMenu()));
menuBar()->addSeparator();
helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
}
void MainWindow::createToolBars()
{
fileToolBar = addToolBar(tr("File"));
fileToolBar->addAction(newAct);
fileToolBar->addAction(openAct);
fileToolBar->addAction(saveAct);
editToolBar = addToolBar(tr("Edit"));
editToolBar->addAction(cutAct);
editToolBar->addAction(copyAct);
editToolBar->addAction(pasteAct);
}
void MainWindow::createStatusBar()
{
statusBar()->showMessage(tr("Ready"));
}
void MainWindow::readSettings()
{
QSettings settings("Trolltech", "MDI Example");
QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
QSize size = settings.value("size", QSize(400, 400)).toSize();
move(pos);
resize(size);
}
void MainWindow::writeSettings()
{
QSettings settings("Trolltech", "MDI Example");
settings.setValue("pos", pos());
settings.setValue("size", size());
}
MdiChild *MainWindow::activeMdiChild()
{
return qobject_cast<MdiChild *>(workspace->activeWindow());
}
MdiChild *MainWindow::findMdiChild(const QString &fileName)
{
QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();
foreach (QWidget *window, workspace->windowList()) {
MdiChild *mdiChild = qobject_cast<MdiChild *>(window);
if (mdiChild->currentFile() == canonicalFilePath)
return mdiChild;
}
return 0;
}
