Set up Menu bar with QAction
Foundations of Qt Development\Chapter08\readwriteapplication\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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.
*
*/
#include <QApplication>
#include "sdiwindow.h"
int main( int argc, char **argv )
{
QApplication app( argc, argv );
(new SdiWindow)->show();
QObject::connect( &app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()) );
return app.exec();
}
Foundations of Qt Development\Chapter08\readwriteapplication\sdiwindow.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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.
*
*/
#include <QApplication>
#include <QMenuBar>
#include <QToolBar>
#include <QStatusBar>
#include <QCloseEvent>
#include <QMessageBox>
#include <QTextEdit>
#include <QFile>
#include <QTextStream>
#include <QFileDialog>
#include "sdiwindow.h"
SdiWindow::SdiWindow( QWidget *parent ) : QMainWindow( parent )
{
setAttribute( Qt::WA_DeleteOnClose );
setWindowTitle( tr("%1[*] - %2" ).arg(tr("unnamed")).arg(tr("SDI")) );
docWidget = new QTextEdit( this );
setCentralWidget( docWidget );
connect( docWidget->document(), SIGNAL(modificationChanged(bool)), this, SLOT(setWindowModified(bool)) );
createActions();
createMenus();
createToolbars();
statusBar()->showMessage( tr("Done") );
}
void SdiWindow::closeEvent( QCloseEvent *event )
{
if( isSafeToClose() )
event->accept();
else
event->ignore();
}
void SdiWindow::fileNew()
{
(new SdiWindow())->show();
}
void SdiWindow::helpAbout()
{
QMessageBox::about( this, tr("About SDI"), tr("A single document interface application.") );
}
void SdiWindow::createActions()
{
newAction = new QAction( QIcon(":/images/new.png"), tr("&New"), this );
newAction->setShortcut( tr("Ctrl+N") );
newAction->setStatusTip( tr("Create a new document") );
connect( newAction, SIGNAL(triggered()), this, SLOT(fileNew()) );
openAction = new QAction( tr("&Open"), this );
openAction->setShortcut( tr("Ctrl+O") );
openAction->setStatusTip( tr("Open a document") );
connect( openAction, SIGNAL(triggered()), this, SLOT(fileOpen()) );
saveAction = new QAction( tr("&Save"), this );
saveAction->setShortcut( tr("Ctrl+S") );
saveAction->setStatusTip( tr("Save the document") );
connect( saveAction, SIGNAL(triggered()), this, SLOT(fileSave()) );
saveAsAction = new QAction( tr("Save &As"), this );
saveAsAction->setStatusTip( tr("Save the document as") );
connect( saveAsAction, SIGNAL(triggered()), this, SLOT(fileSaveAs()) );
closeAction = new QAction( tr("&Close"), this );
closeAction->setShortcut( tr("Ctrl+W") );
closeAction->setStatusTip( tr("Close this document") );
connect( closeAction, SIGNAL(triggered()), this, SLOT(close()) );
exitAction = new QAction( tr("E&xit"), this );
exitAction->setShortcut( tr("Ctrl+Q") );
exitAction->setStatusTip( tr("Quit the application") );
connect( exitAction, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()) );
cutAction = new QAction( QIcon(":/images/cut.png"), tr("Cu&t"), this );
cutAction->setShortcut( tr("Ctrl+X") );
cutAction->setStatusTip( tr("Cut") );
cutAction->setEnabled(false);
connect( docWidget, SIGNAL(copyAvailable(bool)), cutAction, SLOT(setEnabled(bool)) );
connect( cutAction, SIGNAL(triggered()), docWidget, SLOT(cut()) );
copyAction = new QAction( QIcon(":/images/copy.png"), tr("&Copy"), this );
copyAction->setShortcut( tr("Ctrl+C") );
copyAction->setStatusTip( tr("Copy") );
copyAction->setEnabled(false);
connect( docWidget, SIGNAL(copyAvailable(bool)), copyAction, SLOT(setEnabled(bool)) );
connect( copyAction, SIGNAL(triggered()), docWidget, SLOT(copy()) );
pasteAction = new QAction( QIcon(":/images/paste.png"), tr("&Paste"), this );
pasteAction->setShortcut( tr("Ctrl+V") );
pasteAction->setStatusTip( tr("Paste") );
connect( pasteAction, SIGNAL(triggered()), docWidget, SLOT(paste()) );
aboutAction = new QAction( tr("&About"), this );
aboutAction->setStatusTip( tr("About this application") );
connect( aboutAction, SIGNAL(triggered()), this, SLOT(helpAbout()) );
aboutQtAction = new QAction( tr("About &Qt"), this );
aboutQtAction->setStatusTip( tr("About the Qt toolkit") );
connect( aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()) );
}
void SdiWindow::createMenus()
{
QMenu *menu;
menu = menuBar()->addMenu( tr("&File") );
menu->addAction( newAction );
menu->addSeparator();
menu->addAction( openAction );
menu->addAction( saveAction );
menu->addAction( saveAsAction );
menu->addSeparator();
menu->addAction( closeAction );
menu->addSeparator();
menu->addAction( exitAction );
menu = menuBar()->addMenu( tr("&Edit") );
menu->addAction( cutAction );
menu->addAction( copyAction );
menu->addAction( pasteAction );
menu = menuBar()->addMenu( tr("&Help") );
menu->addAction( aboutAction );
menu->addAction( aboutQtAction );
}
void SdiWindow::createToolbars()
{
QToolBar *toolbar;
toolbar = addToolBar( tr("File") );
toolbar->addAction( newAction );
toolbar = addToolBar( tr("Edit") );
toolbar->addAction( cutAction );
toolbar->addAction( copyAction );
toolbar->addAction( pasteAction );
}
bool SdiWindow::isSafeToClose()
{
if( isWindowModified() )
{
switch( QMessageBox::warning( this, tr("SDI"),
tr("The document has unsaved changes.\n"
"Do you want to save it before it is closed?"),
QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel ) )
{
case QMessageBox::Cancel:
return false;
case QMessageBox::Save:
return fileSave();
default:
return true;
}
}
return true;
}
void SdiWindow::fileOpen()
{
QString filename = QFileDialog::getOpenFileName( this );
if( filename.isEmpty() )
return;
if( currentFilename.isEmpty() && !docWidget->document()->isModified() )
loadFile( filename );
else
{
SdiWindow *window = new SdiWindow();
window->loadFile( filename );
window->show();
}
}
bool SdiWindow::fileSave()
{
if( currentFilename.isEmpty() )
return fileSaveAs();
else
return saveFile( currentFilename );
}
bool SdiWindow::fileSaveAs()
{
QString filename = QFileDialog::getSaveFileName( this, tr("Save As"), currentFilename );
if( filename.isEmpty() )
return false;
return saveFile( filename );
}
bool SdiWindow::saveFile( QString filename )
{
QFile file( filename );
if( !file.open( QIODevice::WriteOnly | QIODevice::Text ) )
{
QMessageBox::warning( this, tr("SDI"), tr("Failed to save file.") );
return false;
}
QTextStream stream( &file );
stream << docWidget->toPlainText();
currentFilename = filename;
docWidget->document()->setModified( false );
setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) );
return true;
}
void SdiWindow::loadFile( QString filename )
{
QFile file( filename );
if( !file.open( QIODevice::ReadOnly | QIODevice::Text ) )
{
QMessageBox::warning( this, tr("SDI"), tr("Failed to open file.") );
return;
}
QTextStream stream( &file );
docWidget->setPlainText( stream.readAll() );
currentFilename = filename;
docWidget->document()->setModified( false );
setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) );
}
Foundations of Qt Development\Chapter08\readwriteapplication\sdiwindow.h
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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.
*
*/
#ifndef SDIWINDOW_H
#define SDIWINDOW_H
#include <QMainWindow>
class QAction;
class QTextEdit;
class SdiWindow : public QMainWindow
{
Q_OBJECT
public:
SdiWindow( QWidget *parent = 0 );
protected:
void closeEvent( QCloseEvent *event );
private slots:
void fileNew();
void helpAbout();
void fileOpen();
bool fileSave();
bool fileSaveAs();
private:
void createActions();
void createMenus();
void createToolbars();
bool isSafeToClose();
bool saveFile( QString filename );
void loadFile( QString filename );
QString currentFilename;
QTextEdit *docWidget;
QAction *newAction;
QAction *openAction;
QAction *saveAction;
QAction *saveAsAction;
QAction *closeAction;
QAction *exitAction;
QAction *cutAction;
QAction *copyAction;
QAction *pasteAction;
QAction *aboutAction;
QAction *aboutQtAction;
};
#endif // SDIWINDOW_H
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