C++/Qt/QMenu
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
QT_BEGIN_NAMESPACE
class QAction;
class QActionGroup;
class QLabel;
class QMenu;
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
protected:
void contextMenuEvent(QContextMenuEvent *event);
private slots:
void newFile();
void open();
void save();
void print();
void undo();
void redo();
void cut();
void copy();
void paste();
void bold();
void italic();
void leftAlign();
void rightAlign();
void justify();
void center();
void setLineSpacing();
void setParagraphSpacing();
void about();
void aboutQt();
private:
void createActions();
void createMenus();
QMenu *fileMenu;
QMenu *editMenu;
QMenu *formatMenu;
QMenu *helpMenu;
QActionGroup *alignmentGroup;
QAction *newAct;
QAction *openAct;
QAction *saveAct;
QAction *printAct;
QAction *exitAct;
QAction *undoAct;
QAction *redoAct;
QAction *cutAct;
QAction *copyAct;
QAction *pasteAct;
QAction *boldAct;
QAction *italicAct;
QAction *leftAlignAct;
QAction *rightAlignAct;
QAction *justifyAct;
QAction *centerAct;
QAction *setLineSpacingAct;
QAction *setParagraphSpacingAct;
QAction *aboutAct;
QAction *aboutQtAct;
QLabel *infoLabel;
};
#endif
#include <QtGui>
#include "mainwindow.h"
MainWindow::MainWindow()
{
QWidget *widget = new QWidget;
setCentralWidget(widget);
QWidget *topFiller = new QWidget;
topFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
infoLabel = new QLabel(tr("<i>Choose a menu option, or right-click to "
"invoke a context menu</i>"));
infoLabel->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
infoLabel->setAlignment(Qt::AlignCenter);
QWidget *bottomFiller = new QWidget;
bottomFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
QVBoxLayout *layout = new QVBoxLayout;
layout->setMargin(5);
layout->addWidget(topFiller);
layout->addWidget(infoLabel);
layout->addWidget(bottomFiller);
widget->setLayout(layout);
createActions();
createMenus();
QString message = tr("A context menu is available by right-clicking");
statusBar()->showMessage(message);
setWindowTitle(tr("Menus"));
setMinimumSize(160, 160);
resize(480, 320);
}
void MainWindow::contextMenuEvent(QContextMenuEvent *event)
{
QMenu menu(this);
menu.addAction(cutAct);
menu.addAction(copyAct);
menu.addAction(pasteAct);
menu.exec(event->globalPos());
}
void MainWindow::newFile()
{
infoLabel->setText(tr("Invoked <b>File|New</b>"));
}
void MainWindow::open()
{
infoLabel->setText(tr("Invoked <b>File|Open</b>"));
}
void MainWindow::save()
{
infoLabel->setText(tr("Invoked <b>File|Save</b>"));
}
void MainWindow::print()
{
infoLabel->setText(tr("Invoked <b>File|Print</b>"));
}
void MainWindow::undo()
{
infoLabel->setText(tr("Invoked <b>Edit|Undo</b>"));
}
void MainWindow::redo()
{
infoLabel->setText(tr("Invoked <b>Edit|Redo</b>"));
}
void MainWindow::cut()
{
infoLabel->setText(tr("Invoked <b>Edit|Cut</b>"));
}
void MainWindow::copy()
{
infoLabel->setText(tr("Invoked <b>Edit|Copy</b>"));
}
void MainWindow::paste()
{
infoLabel->setText(tr("Invoked <b>Edit|Paste</b>"));
}
void MainWindow::bold()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Bold</b>"));
}
void MainWindow::italic()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Italic</b>"));
}
void MainWindow::leftAlign()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Left Align</b>"));
}
void MainWindow::rightAlign()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Right Align</b>"));
}
void MainWindow::justify()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Justify</b>"));
}
void MainWindow::center()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Center</b>"));
}
void MainWindow::setLineSpacing()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Set Line Spacing</b>"));
}
void MainWindow::setParagraphSpacing()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Set Paragraph Spacing</b>"));
}
void MainWindow::about()
{
infoLabel->setText(tr("Invoked <b>Help|About</b>"));
QMessageBox::about(this, tr("About Menu"),
tr("The <b>Menu</b> example shows how to create "
"menu-bar menus and context menus."));
}
void MainWindow::aboutQt()
{
infoLabel->setText(tr("Invoked <b>Help|About Qt</b>"));
}
void MainWindow::createActions()
{
newAct = new QAction(tr("&New"), this);
newAct->setShortcuts(QKeySequence::New);
newAct->setStatusTip(tr("Create a new file"));
connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
openAct = new QAction(tr("&Open..."), this);
openAct->setShortcuts(QKeySequence::Open);
openAct->setStatusTip(tr("Open an existing file"));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
saveAct = new QAction(tr("&Save"), this);
saveAct->setShortcuts(QKeySequence::Save);
saveAct->setStatusTip(tr("Save the document to disk"));
connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
printAct = new QAction(tr("&Print..."), this);
printAct->setShortcuts(QKeySequence::Print);
printAct->setStatusTip(tr("Print the document"));
connect(printAct, SIGNAL(triggered()), this, SLOT(print()));
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
exitAct->setStatusTip(tr("Exit the application"));
connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
undoAct = new QAction(tr("&Undo"), this);
undoAct->setShortcuts(QKeySequence::Undo);
undoAct->setStatusTip(tr("Undo the last operation"));
connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));
redoAct = new QAction(tr("&Redo"), this);
redoAct->setShortcuts(QKeySequence::Redo);
redoAct->setStatusTip(tr("Redo the last operation"));
connect(redoAct, SIGNAL(triggered()), this, SLOT(redo()));
cutAct = new QAction(tr("Cu&t"), this);
cutAct->setShortcuts(QKeySequence::Cut);
cutAct->setStatusTip(tr("Cut the current selection"s contents to the "
"clipboard"));
connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));
copyAct = new QAction(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(tr("&Paste"), this);
pasteAct->setShortcuts(QKeySequence::Paste);
pasteAct->setStatusTip(tr("Paste the clipboard"s contents into the current "
"selection"));
connect(pasteAct, SIGNAL(triggered()), this, SLOT(paste()));
boldAct = new QAction(tr("&Bold"), this);
boldAct->setCheckable(true);
boldAct->setShortcut(tr("Ctrl+B"));
boldAct->setStatusTip(tr("Make the text bold"));
connect(boldAct, SIGNAL(triggered()), this, SLOT(bold()));
QFont boldFont = boldAct->font();
boldFont.setBold(true);
boldAct->setFont(boldFont);
italicAct = new QAction(tr("&Italic"), this);
italicAct->setCheckable(true);
italicAct->setShortcut(tr("Ctrl+I"));
italicAct->setStatusTip(tr("Make the text italic"));
connect(italicAct, SIGNAL(triggered()), this, SLOT(italic()));
QFont italicFont = italicAct->font();
italicFont.setItalic(true);
italicAct->setFont(italicFont);
setLineSpacingAct = new QAction(tr("Set &Line Spacing..."), this);
setLineSpacingAct->setStatusTip(tr("Change the gap between the lines of a "
"paragraph"));
connect(setLineSpacingAct, SIGNAL(triggered()), this, SLOT(setLineSpacing()));
setParagraphSpacingAct = new QAction(tr("Set &Paragraph Spacing..."), this);
setLineSpacingAct->setStatusTip(tr("Change the gap between paragraphs"));
connect(setParagraphSpacingAct, SIGNAL(triggered()),
this, SLOT(setParagraphSpacing()));
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()));
connect(aboutQtAct, SIGNAL(triggered()), this, SLOT(aboutQt()));
leftAlignAct = new QAction(tr("&Left Align"), this);
leftAlignAct->setCheckable(true);
leftAlignAct->setShortcut(tr("Ctrl+L"));
leftAlignAct->setStatusTip(tr("Left align the selected text"));
connect(leftAlignAct, SIGNAL(triggered()), this, SLOT(leftAlign()));
rightAlignAct = new QAction(tr("&Right Align"), this);
rightAlignAct->setCheckable(true);
rightAlignAct->setShortcut(tr("Ctrl+R"));
rightAlignAct->setStatusTip(tr("Right align the selected text"));
connect(rightAlignAct, SIGNAL(triggered()), this, SLOT(rightAlign()));
justifyAct = new QAction(tr("&Justify"), this);
justifyAct->setCheckable(true);
justifyAct->setShortcut(tr("Ctrl+J"));
justifyAct->setStatusTip(tr("Justify the selected text"));
connect(justifyAct, SIGNAL(triggered()), this, SLOT(justify()));
centerAct = new QAction(tr("&Center"), this);
centerAct->setCheckable(true);
centerAct->setShortcut(tr("Ctrl+E"));
centerAct->setStatusTip(tr("Center the selected text"));
connect(centerAct, SIGNAL(triggered()), this, SLOT(center()));
alignmentGroup = new QActionGroup(this);
alignmentGroup->addAction(leftAlignAct);
alignmentGroup->addAction(rightAlignAct);
alignmentGroup->addAction(justifyAct);
alignmentGroup->addAction(centerAct);
leftAlignAct->setChecked(true);
}
void MainWindow::createMenus()
{
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(newAct);
fileMenu->addAction(openAct);
fileMenu->addAction(saveAct);
fileMenu->addAction(printAct);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
editMenu = menuBar()->addMenu(tr("&Edit"));
editMenu->addAction(undoAct);
editMenu->addAction(redoAct);
editMenu->addSeparator();
editMenu->addAction(cutAct);
editMenu->addAction(copyAct);
editMenu->addAction(pasteAct);
editMenu->addSeparator();
helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
formatMenu = editMenu->addMenu(tr("&Format"));
formatMenu->addAction(boldAct);
formatMenu->addAction(italicAct);
formatMenu->addSeparator()->setText(tr("Alignment"));
formatMenu->addAction(leftAlignAct);
formatMenu->addAction(rightAlignAct);
formatMenu->addAction(justifyAct);
formatMenu->addAction(centerAct);
formatMenu->addSeparator();
formatMenu->addAction(setLineSpacingAct);
formatMenu->addAction(setParagraphSpacingAct);
}
#include <QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow window;
window.show();
return app.exec();
}
Image viewer
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef IMAGEVIEWER_H
#define IMAGEVIEWER_H
#include <QMainWindow>
#include <QPrinter>
QT_BEGIN_NAMESPACE
class QAction;
class QLabel;
class QMenu;
class QScrollArea;
class QScrollBar;
QT_END_NAMESPACE
class ImageViewer : public QMainWindow
{
Q_OBJECT
public:
ImageViewer();
private slots:
void open();
void print();
void zoomIn();
void zoomOut();
void normalSize();
void fitToWindow();
void about();
private:
void createActions();
void createMenus();
void updateActions();
void scaleImage(double factor);
void adjustScrollBar(QScrollBar *scrollBar, double factor);
QLabel *imageLabel;
QScrollArea *scrollArea;
double scaleFactor;
#ifndef QT_NO_PRINTER
QPrinter printer;
#endif
QAction *openAct;
QAction *printAct;
QAction *exitAct;
QAction *zoomInAct;
QAction *zoomOutAct;
QAction *normalSizeAct;
QAction *fitToWindowAct;
QAction *aboutAct;
QAction *aboutQtAct;
QMenu *fileMenu;
QMenu *viewMenu;
QMenu *helpMenu;
};
#endif
#include <QtGui>
#include "imageviewer.h"
ImageViewer::ImageViewer()
{
imageLabel = new QLabel;
imageLabel->setBackgroundRole(QPalette::Base);
imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
imageLabel->setScaledContents(true);
scrollArea = new QScrollArea;
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setWidget(imageLabel);
setCentralWidget(scrollArea);
createActions();
createMenus();
setWindowTitle(tr("Image Viewer"));
resize(500, 400);
}
void ImageViewer::open()
{
QString fileName = QFileDialog::getOpenFileName(this,
tr("Open File"), QDir::currentPath());
if (!fileName.isEmpty()) {
QImage image(fileName);
if (image.isNull()) {
QMessageBox::information(this, tr("Image Viewer"),
tr("Cannot load %1.").arg(fileName));
return;
}
imageLabel->setPixmap(QPixmap::fromImage(image));
scaleFactor = 1.0;
printAct->setEnabled(true);
fitToWindowAct->setEnabled(true);
updateActions();
if (!fitToWindowAct->isChecked())
imageLabel->adjustSize();
}
}
void ImageViewer::print()
{
Q_ASSERT(imageLabel->pixmap());
#ifndef QT_NO_PRINTER
QPrintDialog dialog(&printer, this);
if (dialog.exec()) {
QPainter painter(&printer);
QRect rect = painter.viewport();
QSize size = imageLabel->pixmap()->size();
size.scale(rect.size(), Qt::KeepAspectRatio);
painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
painter.setWindow(imageLabel->pixmap()->rect());
painter.drawPixmap(0, 0, *imageLabel->pixmap());
}
#endif
}
void ImageViewer::zoomIn()
{
scaleImage(1.25);
}
void ImageViewer::zoomOut()
{
scaleImage(0.8);
}
void ImageViewer::normalSize()
{
imageLabel->adjustSize();
scaleFactor = 1.0;
}
void ImageViewer::fitToWindow()
{
bool fitToWindow = fitToWindowAct->isChecked();
scrollArea->setWidgetResizable(fitToWindow);
if (!fitToWindow) {
normalSize();
}
updateActions();
}
void ImageViewer::about()
{
QMessageBox::about(this, tr("About Image Viewer"),
tr("<p>The <b>Image Viewer</b> example shows how to combine QLabel "
"and QScrollArea to display an image. QLabel is typically used "
"for displaying a text, but it can also display an image. "
"QScrollArea provides a scrolling view around another widget. "
"If the child widget exceeds the size of the frame, QScrollArea "
"automatically provides scroll bars. </p><p>The example "
"demonstrates how QLabel"s ability to scale its contents "
"(QLabel::scaledContents), and QScrollArea"s ability to "
"automatically resize its contents "
"(QScrollArea::widgetResizable), can be used to implement "
"zooming and scaling features. </p><p>In addition the example "
"shows how to use QPainter to print an image.</p>"));
}
void ImageViewer::createActions()
{
openAct = new QAction(tr("&Open..."), this);
openAct->setShortcut(tr("Ctrl+O"));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
printAct = new QAction(tr("&Print..."), this);
printAct->setShortcut(tr("Ctrl+P"));
printAct->setEnabled(false);
connect(printAct, SIGNAL(triggered()), this, SLOT(print()));
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
zoomInAct = new QAction(tr("Zoom &In (25%)"), this);
zoomInAct->setShortcut(tr("Ctrl++"));
zoomInAct->setEnabled(false);
connect(zoomInAct, SIGNAL(triggered()), this, SLOT(zoomIn()));
zoomOutAct = new QAction(tr("Zoom &Out (25%)"), this);
zoomOutAct->setShortcut(tr("Ctrl+-"));
zoomOutAct->setEnabled(false);
connect(zoomOutAct, SIGNAL(triggered()), this, SLOT(zoomOut()));
normalSizeAct = new QAction(tr("&Normal Size"), this);
normalSizeAct->setShortcut(tr("Ctrl+S"));
normalSizeAct->setEnabled(false);
connect(normalSizeAct, SIGNAL(triggered()), this, SLOT(normalSize()));
fitToWindowAct = new QAction(tr("&Fit to Window"), this);
fitToWindowAct->setEnabled(false);
fitToWindowAct->setCheckable(true);
fitToWindowAct->setShortcut(tr("Ctrl+F"));
connect(fitToWindowAct, SIGNAL(triggered()), this, SLOT(fitToWindow()));
aboutAct = new QAction(tr("&About"), this);
connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
aboutQtAct = new QAction(tr("About &Qt"), this);
connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
}
void ImageViewer::createMenus()
{
fileMenu = new QMenu(tr("&File"), this);
fileMenu->addAction(openAct);
fileMenu->addAction(printAct);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
viewMenu = new QMenu(tr("&View"), this);
viewMenu->addAction(zoomInAct);
viewMenu->addAction(zoomOutAct);
viewMenu->addAction(normalSizeAct);
viewMenu->addSeparator();
viewMenu->addAction(fitToWindowAct);
helpMenu = new QMenu(tr("&Help"), this);
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
menuBar()->addMenu(fileMenu);
menuBar()->addMenu(viewMenu);
menuBar()->addMenu(helpMenu);
}
void ImageViewer::updateActions()
{
zoomInAct->setEnabled(!fitToWindowAct->isChecked());
zoomOutAct->setEnabled(!fitToWindowAct->isChecked());
normalSizeAct->setEnabled(!fitToWindowAct->isChecked());
}
void ImageViewer::scaleImage(double factor)
{
Q_ASSERT(imageLabel->pixmap());
scaleFactor *= factor;
imageLabel->resize(scaleFactor * imageLabel->pixmap()->size());
adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
adjustScrollBar(scrollArea->verticalScrollBar(), factor);
zoomInAct->setEnabled(scaleFactor < 3.0);
zoomOutAct->setEnabled(scaleFactor > 0.333);
}
void ImageViewer::adjustScrollBar(QScrollBar *scrollBar, double factor)
{
scrollBar->setValue(int(factor * scrollBar->value()
+ ((factor - 1) * scrollBar->pageStep()/2)));
}
#include <QApplication>
#include "imageviewer.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
ImageViewer imageViewer;
imageViewer.show();
return app.exec();
}
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QList>
#include <QMainWindow>
QT_BEGIN_NAMESPACE
class QAction;
class QMenu;
class QTextEdit;
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
private slots:
void newFile();
void open();
void save();
void saveAs();
void openRecentFile();
void about();
private:
void createActions();
void createMenus();
void loadFile(const QString &fileName);
void saveFile(const QString &fileName);
void setCurrentFile(const QString &fileName);
void updateRecentFileActions();
QString strippedName(const QString &fullFileName);
QString curFile;
QTextEdit *textEdit;
QMenu *fileMenu;
QMenu *recentFilesMenu;
QMenu *helpMenu;
QAction *newAct;
QAction *openAct;
QAction *saveAct;
QAction *saveAsAct;
QAction *exitAct;
QAction *aboutAct;
QAction *aboutQtAct;
QAction *separatorAct;
enum { MaxRecentFiles = 5 };
QAction *recentFileActs[MaxRecentFiles];
};
#endif
#include <QtGui>
#include "mainwindow.h"
MainWindow::MainWindow()
{
setAttribute(Qt::WA_DeleteOnClose);
textEdit = new QTextEdit;
setCentralWidget(textEdit);
createActions();
createMenus();
(void)statusBar();
setWindowTitle(tr("Recent Files"));
resize(400, 300);
}
void MainWindow::newFile()
{
MainWindow *other = new MainWindow;
other->show();
}
void MainWindow::open()
{
QString fileName = QFileDialog::getOpenFileName(this);
if (!fileName.isEmpty())
loadFile(fileName);
}
void MainWindow::save()
{
if (curFile.isEmpty())
saveAs();
else
saveFile(curFile);
}
void MainWindow::saveAs()
{
QString fileName = QFileDialog::getSaveFileName(this);
if (fileName.isEmpty())
return;
saveFile(fileName);
}
void MainWindow::openRecentFile()
{
QAction *action = qobject_cast<QAction *>(sender());
if (action)
loadFile(action->data().toString());
}
void MainWindow::about()
{
QMessageBox::about(this, tr("About Recent Files"),
tr("The <b>Recent Files</b> example demonstrates how to provide a "
"recently used file menu in a Qt application."));
}
void MainWindow::createActions()
{
newAct = new QAction(tr("&New"), this);
newAct->setShortcuts(QKeySequence::New);
newAct->setStatusTip(tr("Create a new file"));
connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
openAct = new QAction(tr("&Open..."), this);
openAct->setShortcuts(QKeySequence::Open);
openAct->setStatusTip(tr("Open an existing file"));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
saveAct = new QAction(tr("&Save"), this);
saveAct->setShortcuts(QKeySequence::Save);
saveAct->setStatusTip(tr("Save the document to disk"));
connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
saveAsAct = new QAction(tr("Save &As..."), this);
saveAsAct->setShortcuts(QKeySequence::SaveAs);
saveAsAct->setStatusTip(tr("Save the document under a new name"));
connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
for (int i = 0; i < MaxRecentFiles; ++i) {
recentFileActs[i] = new QAction(this);
recentFileActs[i]->setVisible(false);
connect(recentFileActs[i], SIGNAL(triggered()),
this, SLOT(openRecentFile()));
}
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()));
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);
separatorAct = fileMenu->addSeparator();
for (int i = 0; i < MaxRecentFiles; ++i)
fileMenu->addAction(recentFileActs[i]);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
updateRecentFileActions();
menuBar()->addSeparator();
helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
}
void MainWindow::loadFile(const QString &fileName)
{
QFile file(fileName);
if (!file.open(QFile::ReadOnly | QFile::Text)) {
QMessageBox::warning(this, tr("Recent Files"),
tr("Cannot read file %1:\n%2.")
.arg(fileName)
.arg(file.errorString()));
return;
}
QTextStream in(&file);
QApplication::setOverrideCursor(Qt::WaitCursor);
textEdit->setPlainText(in.readAll());
QApplication::restoreOverrideCursor();
setCurrentFile(fileName);
statusBar()->showMessage(tr("File loaded"), 2000);
}
void MainWindow::saveFile(const QString &fileName)
{
QFile file(fileName);
if (!file.open(QFile::WriteOnly | QFile::Text)) {
QMessageBox::warning(this, tr("Recent Files"),
tr("Cannot write file %1:\n%2.")
.arg(fileName)
.arg(file.errorString()));
return;
}
QTextStream out(&file);
QApplication::setOverrideCursor(Qt::WaitCursor);
out << textEdit->toPlainText();
QApplication::restoreOverrideCursor();
setCurrentFile(fileName);
statusBar()->showMessage(tr("File saved"), 2000);
}
void MainWindow::setCurrentFile(const QString &fileName)
{
curFile = fileName;
if (curFile.isEmpty())
setWindowTitle(tr("Recent Files"));
else
setWindowTitle(tr("%1 - %2").arg(strippedName(curFile))
.arg(tr("Recent Files")));
QSettings settings("Trolltech", "Recent Files Example");
QStringList files = settings.value("recentFileList").toStringList();
files.removeAll(fileName);
files.prepend(fileName);
while (files.size() > MaxRecentFiles)
files.removeLast();
settings.setValue("recentFileList", files);
foreach (QWidget *widget, QApplication::topLevelWidgets()) {
MainWindow *mainWin = qobject_cast<MainWindow *>(widget);
if (mainWin)
mainWin->updateRecentFileActions();
}
}
void MainWindow::updateRecentFileActions()
{
QSettings settings("Trolltech", "Recent Files Example");
QStringList files = settings.value("recentFileList").toStringList();
int numRecentFiles = qMin(files.size(), (int)MaxRecentFiles);
for (int i = 0; i < numRecentFiles; ++i) {
QString text = tr("&%1 %2").arg(i + 1).arg(strippedName(files[i]));
recentFileActs[i]->setText(text);
recentFileActs[i]->setData(files[i]);
recentFileActs[i]->setVisible(true);
}
for (int j = numRecentFiles; j < MaxRecentFiles; ++j)
recentFileActs[j]->setVisible(false);
separatorAct->setVisible(numRecentFiles > 0);
}
QString MainWindow::strippedName(const QString &fullFileName)
{
return QFileInfo(fullFileName).fileName();
}
#include <QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow *mainWin = new MainWindow;
mainWin->show();
return app.exec();
}