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SGI Freeware 2002 November
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SGI Freeware 2002 November - Disc 3.iso
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fw_qt3.idb
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freeware
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Qt
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examples
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action
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application.cpp.z
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application.cpp
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2002-04-08
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304 lines
/****************************************************************************
** $Id: qt/application.cpp 3.0.3 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "application.h"
#include <qimage.h>
#include <qpixmap.h>
#include <qtoolbar.h>
#include <qtoolbutton.h>
#include <qpopupmenu.h>
#include <qmenubar.h>
#include <qtextedit.h>
#include <qfile.h>
#include <qfiledialog.h>
#include <qstatusbar.h>
#include <qmessagebox.h>
#include <qprinter.h>
#include <qapplication.h>
#include <qaccel.h>
#include <qtextstream.h>
#include <qpainter.h>
#include <qpaintdevicemetrics.h>
#include <qwhatsthis.h>
#include <qaction.h>
#include "filesave.xpm"
#include "fileopen.xpm"
#include "fileprint.xpm"
ApplicationWindow::ApplicationWindow()
: QMainWindow( 0, "example application main window", WDestructiveClose )
{
printer = new QPrinter;
QAction * fileNewAction;
QAction * fileOpenAction;
QAction * fileSaveAction, * fileSaveAsAction, * filePrintAction;
QAction * fileCloseAction, * fileQuitAction;
fileNewAction = new QAction( "New", "&New", CTRL+Key_N, this, "new" );
connect( fileNewAction, SIGNAL( activated() ) , this,
SLOT( newDoc() ) );
fileOpenAction = new QAction( "Open File", QPixmap( fileopen ), "&Open",
CTRL+Key_O, this, "open" );
connect( fileOpenAction, SIGNAL( activated() ) , this, SLOT( choose() ) );
const char * fileOpenText = "<p><img source=\"fileopen\"> "
"Click this button to open a <em>new file</em>. <br>"
"You can also select the <b>Open</b> command "
"from the <b>File</b> menu.</p>";
QMimeSourceFactory::defaultFactory()->setPixmap( "fileopen",
fileOpenAction->iconSet().pixmap() );
fileOpenAction->setWhatsThis( fileOpenText );
fileSaveAction = new QAction( "Save File", QPixmap( filesave ),
"&Save", CTRL+Key_S, this, "save" );
connect( fileSaveAction, SIGNAL( activated() ) , this, SLOT( save() ) );
const char * fileSaveText = "<p>Click this button to save the file you "
"are editing. You will be prompted for a file name.\n"
"You can also select the <b>Save</b> command "
"from the <b>File</b> menu.</p>";
fileSaveAction->setWhatsThis( fileSaveText );
fileSaveAsAction = new QAction( "Save File As", "Save &as", 0, this,
"save as" );
connect( fileSaveAsAction, SIGNAL( activated() ) , this,
SLOT( saveAs() ) );
fileSaveAsAction->setWhatsThis( fileSaveText );
filePrintAction = new QAction( "Print File", QPixmap( fileprint ),
"&Print", CTRL+Key_P, this, "print" );
connect( filePrintAction, SIGNAL( activated() ) , this,
SLOT( print() ) );
const char * filePrintText = "Click this button to print the file you "
"are editing.\n You can also select the Print "
"command from the File menu.";
filePrintAction->setWhatsThis( filePrintText );
fileCloseAction = new QAction( "Close", "&Close", CTRL+Key_W, this,
"close" );
connect( fileCloseAction, SIGNAL( activated() ) , this,
SLOT( close() ) );
fileQuitAction = new QAction( "Quit", "&Quit", CTRL+Key_Q, this,
"quit" );
connect( fileQuitAction, SIGNAL( activated() ) , qApp,
SLOT( closeAllWindows() ) );
// populate a tool bar with some actions
QToolBar * fileTools = new QToolBar( this, "file operations" );
fileTools->setLabel( "File Operations" );
fileOpenAction->addTo( fileTools );
fileSaveAction->addTo( fileTools );
filePrintAction->addTo( fileTools );
(void)QWhatsThis::whatsThisButton( fileTools );
// populate a menu with all actions
QPopupMenu * file = new QPopupMenu( this );
menuBar()->insertItem( "&File", file );
fileNewAction->addTo( file );
fileOpenAction->addTo( file );
fileSaveAction->addTo( file );
fileSaveAsAction->addTo( file );
file->insertSeparator();
filePrintAction->addTo( file );
file->insertSeparator();
fileCloseAction->addTo( file );
fileQuitAction->addTo( file );
menuBar()->insertSeparator();
// add a help menu
QPopupMenu * help = new QPopupMenu( this );
menuBar()->insertItem( "&Help", help );
help->insertItem( "&About", this, SLOT(about()), Key_F1 );
help->insertItem( "About &Qt", this, SLOT(aboutQt()) );
help->insertSeparator();
help->insertItem( "What's &This", this, SLOT(whatsThis()),
SHIFT+Key_F1 );
// create and define the central widget
e = new QTextEdit( this, "editor" );
e->setFocus();
setCentralWidget( e );
statusBar()->message( "Ready", 2000 );
resize( 450, 600 );
}
ApplicationWindow::~ApplicationWindow()
{
delete printer;
}
void ApplicationWindow::newDoc()
{
ApplicationWindow *ed = new ApplicationWindow;
ed->show();
}
void ApplicationWindow::choose()
{
QString fn = QFileDialog::getOpenFileName( QString::null, QString::null,
this);
if ( !fn.isEmpty() )
load( fn );
else
statusBar()->message( "Loading aborted", 2000 );
}
void ApplicationWindow::load( const QString &fileName )
{
QFile f( fileName );
if ( !f.open( IO_ReadOnly ) )
return;
QTextStream ts( &f );
e->setText( ts.read() );
e->setModified( FALSE );
setCaption( fileName );
statusBar()->message( "Loaded document " + fileName, 2000 );
}
void ApplicationWindow::save()
{
if ( filename.isEmpty() ) {
saveAs();
return;
}
QString text = e->text();
QFile f( filename );
if ( !f.open( IO_WriteOnly ) ) {
statusBar()->message( QString("Could not write to %1").arg(filename),
2000 );
return;
}
QTextStream t( &f );
t << text;
f.close();
e->setModified( FALSE );
setCaption( filename );
statusBar()->message( QString( "File %1 saved" ).arg( filename ), 2000 );
}
void ApplicationWindow::saveAs()
{
QString fn = QFileDialog::getSaveFileName( QString::null, QString::null,
this );
if ( !fn.isEmpty() ) {
filename = fn;
save();
} else {
statusBar()->message( "Saving aborted", 2000 );
}
}
void ApplicationWindow::print()
{
const int Margin = 10;
int pageNo = 1;
if ( printer->setup(this) ) { // printer dialog
statusBar()->message( "Printing..." );
QPainter p;
if( !p.begin( printer ) ) // paint on printer
return;
p.setFont( e->font() );
int yPos = 0; // y-position for each line
QFontMetrics fm = p.fontMetrics();
QPaintDeviceMetrics metrics( printer ); // need width/height
// of printer surface
for( int i = 0 ; i < e->lines() ; i++ ) {
if ( Margin + yPos > metrics.height() - Margin ) {
QString msg( "Printing (page " );
msg += QString::number( ++pageNo );
msg += ")...";
statusBar()->message( msg );
printer->newPage(); // no more room on this page
yPos = 0; // back to top of page
}
p.drawText( Margin, Margin + yPos,
metrics.width(), fm.lineSpacing(),
ExpandTabs | DontClip,
e->text( i ) );
yPos = yPos + fm.lineSpacing();
}
p.end(); // send job to printer
statusBar()->message( "Printing completed", 2000 );
} else {
statusBar()->message( "Printing aborted", 2000 );
}
}
void ApplicationWindow::closeEvent( QCloseEvent* ce )
{
if ( !e->isModified() ) {
ce->accept();
return;
}
switch( QMessageBox::information( this, "Qt Application Example",
"The document has been changed since "
"the last save.",
"Save Now", "Cancel", "Leave Anyway",
0, 1 ) ) {
case 0:
save();
ce->accept();
break;
case 1:
default: // just for sanity
ce->ignore();
break;
case 2:
ce->accept();
break;
}
}
void ApplicationWindow::about()
{
QMessageBox::about( this, "Qt Application Example",
"This example demonstrates simple use of "
"QMainWindow,\nQMenuBar and QToolBar.");
}
void ApplicationWindow::aboutQt()
{
QMessageBox::aboutQt( this, "Qt Application Example" );
}