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Header file:
/****************************************************************************
** $Id: qt/qwerty.h 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef QWERTY_H
#define QWERTY_H
#include <qwidget.h>
#include <qmenubar.h>
#include <qmultilineedit.h>
#include <qprinter.h>
class Editor : public QWidget
{
Q_OBJECT
public:
Editor( QWidget *parent=0, const char *name="qwerty" );
~Editor();
void load( const QString& fileName, int code=-1 );
public slots:
void newDoc();
void load();
bool save();
void print();
void addEncoding();
void toUpper();
void toLower();
void font();
protected:
void resizeEvent( QResizeEvent * );
void closeEvent( QCloseEvent * );
private slots:
void saveAsEncoding( int );
void openAsEncoding( int );
void textChanged();
private:
bool saveAs( const QString& fileName, int code=-1 );
void rebuildCodecList();
QMenuBar *m;
QMultiLineEdit *e;
#ifndef QT_NO_PRINTER
QPrinter printer;
#endif
QPopupMenu *save_as;
QPopupMenu *open_as;
bool changed;
};
#endif // QWERTY_H
Implementation:
/****************************************************************************
** $Id: qt/qwerty.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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 "qwerty.h"
#include <qapplication.h>
#include <qfile.h>
#include <qfiledialog.h>
#include <qpopupmenu.h>
#include <qtextstream.h>
#include <qpainter.h>
#include <qmessagebox.h>
#include <qpaintdevicemetrics.h>
#include <qptrlist.h>
#include <qfontdialog.h>
#include <qtextcodec.h>
const bool no_writing = FALSE;
static QPtrList<QTextCodec> *codecList = 0;
enum { Uni = 0, MBug = 1, Lat1 = 2, Local = 3, Guess = 4, Codec = 5 };
Editor::Editor( QWidget * parent , const char * name )
: QWidget( parent, name, WDestructiveClose )
{
m = new QMenuBar( this, "menu" );
QPopupMenu * file = new QPopupMenu();
Q_CHECK_PTR( file );
m->insertItem( "&File", file );
file->insertItem( "&New", this, SLOT(newDoc()), ALT+Key_N );
file->insertItem( "&Open...", this, SLOT(load()), ALT+Key_O );
file->insertItem( "&Save...", this, SLOT(save()), ALT+Key_S );
file->insertSeparator();
open_as = new QPopupMenu();
file->insertItem( "Open &As", open_as );
save_as = new QPopupMenu();
file->insertItem( "Sa&ve As", save_as );
file->insertItem( "Add &Encoding", this, SLOT(addEncoding()) );
#ifndef QT_NO_PRINTER
file->insertSeparator();
file->insertItem( "&Print...", this, SLOT(print()), ALT+Key_P );
#endif
file->insertSeparator();
file->insertItem( "&Close", this, SLOT(close()),ALT+Key_W );
file->insertItem( "&Quit", qApp, SLOT(closeAllWindows()), ALT+Key_Q );
connect( save_as, SIGNAL(activated(int)), this, SLOT(saveAsEncoding(int)) );
connect( open_as, SIGNAL(activated(int)), this, SLOT(openAsEncoding(int)) );
rebuildCodecList();
QPopupMenu * edit = new QPopupMenu();
Q_CHECK_PTR( edit );
m->insertItem( "&Edit", edit );
edit->insertItem( "To &Uppercase", this, SLOT(toUpper()), ALT+Key_U );
edit->insertItem( "To &Lowercase", this, SLOT(toLower()), ALT+Key_L );
#ifndef QT_NO_FONTDIALOG
edit->insertSeparator();
edit->insertItem( "&Select Font" , this, SLOT(font()), ALT+Key_T );
#endif
changed = FALSE;
e = new QMultiLineEdit( this, "editor" );
connect( e, SIGNAL( textChanged() ), this, SLOT( textChanged() ) );
// We use Unifont - if you have it installed you'll see all
// Unicode character glyphs.
//
// Unifont only comes in one pixel size, so we cannot let
// it change pixel size as the display DPI changes.
//
QFont unifont("unifont",16,50); unifont.setPixelSize(16);
e->setFont( unifont );
e->setFocus();
}
Editor::~Editor()
{
}
void Editor::font()
{
#ifndef QT_NO_FONTDIALOG
bool ok;
QFont f = QFontDialog::getFont( &ok, e->font() );
if ( ok ) {
e->setFont( f );
}
#endif
}
void Editor::rebuildCodecList()
{
delete codecList;
codecList = new QPtrList<QTextCodec>;
QTextCodec *codec;
int i;
for (i = 0; (codec = QTextCodec::codecForIndex(i)); i++)
codecList->append( codec );
int n = codecList->count();
for (int pm=0; pm<2; pm++) {
QPopupMenu* menu = pm ? open_as : save_as;
menu->clear();
QString local = "Local (";
local += QTextCodec::codecForLocale()->name();
local += ")";
menu->insertItem( local, Local );
menu->insertItem( "Unicode", Uni );
menu->insertItem( "Latin1", Lat1 );
menu->insertItem( "Microsoft Unicode", MBug );
if ( pm )
menu->insertItem( "[guess]", Guess );
for ( i = 0; i < n; i++ )
menu->insertItem( codecList->at(i)->name(), Codec + i );
}
}
void Editor::newDoc()
{
Editor *ed = new Editor;
if ( qApp->desktop()->size().width() < 450
|| qApp->desktop()->size().height() < 450 ) {
ed->showMaximized();
} else {
ed->resize( 400, 400 );
ed->show();
}
}
void Editor::load()
{
#ifndef QT_NO_FILEDIALOG
QString fn = QFileDialog::getOpenFileName( QString::null, QString::null, this );
if ( !fn.isEmpty() )
load( fn, -1 );
#endif
}
void Editor::load( const QString& fileName, int code )
{
QFile f( fileName );
if ( !f.open( IO_ReadOnly ) )
return;
e->setAutoUpdate( FALSE );
QTextStream t(&f);
if ( code >= Codec )
t.setCodec( codecList->at(code-Codec) );
else if ( code == Uni )
t.setEncoding( QTextStream::Unicode );
else if ( code == MBug )
t.setEncoding( QTextStream::UnicodeReverse );
else if ( code == Lat1 )
t.setEncoding( QTextStream::Latin1 );
else if ( code == Guess ) {
QFile f(fileName);
f.open(IO_ReadOnly);
char buffer[256];
int l = 256;
l=f.readBlock(buffer,l);
QTextCodec* codec = QTextCodec::codecForContent(buffer, l);
if ( codec ) {
QMessageBox::information(this,"Encoding",QString("Codec: ")+codec->name());
t.setCodec( codec );
}
}
e->setText( t.read() );
f.close();
e->setAutoUpdate( TRUE );
e->repaint();
setCaption( fileName );
changed = FALSE;
}
void Editor::openAsEncoding( int code )
{
#ifndef QT_NO_FILEDIALOG
//storing filename (proper save) is left as an exercise...
QString fn = QFileDialog::getOpenFileName( QString::null, QString::null, this );
if ( !fn.isEmpty() )
(void) load( fn, code );
#endif
}
bool Editor::save()
{
#ifndef QT_NO_FILEDIALOG
//storing filename (proper save) is left as an exercise...
QString fn = QFileDialog::getSaveFileName( QString::null, QString::null, this );
if ( !fn.isEmpty() )
return saveAs( fn );
return FALSE;
#endif
}
void Editor::saveAsEncoding( int code )
{
#ifndef QT_NO_FILEDIALOG
//storing filename (proper save) is left as an exercise...
QString fn = QFileDialog::getSaveFileName( QString::null, QString::null, this );
if ( !fn.isEmpty() )
(void) saveAs( fn, code );
#endif
}
void Editor::addEncoding()
{
#ifndef QT_NO_FILEDIALOG
QString fn = QFileDialog::getOpenFileName( QString::null, "*.map", this );
if ( !fn.isEmpty() ) {
QFile f(fn);
if (f.open(IO_ReadOnly)) {
if (QTextCodec::loadCharmap(&f)) {
rebuildCodecList();
} else {
QMessageBox::warning(0,"Charmap error",
"The file did not contain a valid charmap.\n\n"
"A charmap file should look like this:\n"
" <code_set_name> thename\n"
" <escape_char> /\n"
" % alias thealias\n"
" CHARMAP\n"
" <tokenname> /x12 <U3456>\n"
" <tokenname> /xAB/x12 <U0023>\n"
" ...\n"
" END CHARMAP\n"
);
}
}
}
#endif
}
bool Editor::saveAs( const QString& fileName, int code )
{
QFile f( fileName );
if ( no_writing || !f.open( IO_WriteOnly ) ) {
QMessageBox::warning(this,"I/O Error",
QString("The file could not be opened.\n\n")
+fileName);
return FALSE;
}
QTextStream t(&f);
if ( code >= Codec )
t.setCodec( codecList->at(code-Codec) );
else if ( code == Uni )
t.setEncoding( QTextStream::Unicode );
else if ( code == MBug )
t.setEncoding( QTextStream::UnicodeReverse );
else if ( code == Lat1 )
t.setEncoding( QTextStream::Latin1 );
t << e->text();
f.close();
setCaption( fileName );
changed = FALSE;
return TRUE;
}
void Editor::print()
{
#ifndef QT_NO_PRINTER
if ( printer.setup(this) ) { // opens printer dialog
printer.setFullPage(TRUE); // we'll set our own margins
QPainter p;
p.begin( &printer ); // paint on printer
p.setFont( e->font() );
QFontMetrics fm = p.fontMetrics();
QPaintDeviceMetrics metrics( &printer ); // need width/height
// of printer surface
const int MARGIN = metrics.logicalDpiX() / 2; // half-inch margin
int yPos = MARGIN; // y position for each line
for( int i = 0 ; i < e->numLines() ; i++ ) {
if ( printer.aborted() )
break;
if ( yPos + fm.lineSpacing() > metrics.height() - MARGIN ) {
// no more room on this page
if ( !printer.newPage() ) // start new page
break; // some error
yPos = MARGIN; // back to top of page
}
p.drawText( MARGIN, yPos, metrics.width() - 2*MARGIN,
fm.lineSpacing(), ExpandTabs, e->textLine( i ) );
yPos += fm.lineSpacing();
}
p.end(); // send job to printer
}
#endif
}
void Editor::resizeEvent( QResizeEvent * )
{
if ( e && m )
e->setGeometry( 0, m->height(), width(), height() - m->height() );
}
void Editor::closeEvent( QCloseEvent *event )
{
event->accept();
if ( changed ) { // the text has been changed
switch ( QMessageBox::warning( this, "Qwerty",
"Save changes to Document?",
tr("&Yes"),
tr("&No"),
tr("Cancel"),
0, 2) ) {
case 0: // yes
if ( save() )
event->accept();
else
event->ignore();
break;
case 1: // no
event->accept();
break;
default: // cancel
event->ignore();
break;
}
}
}
void Editor::toUpper()
{
e->setText(e->text().upper());
}
void Editor::toLower()
{
e->setText(e->text().lower());
}
void Editor::textChanged()
{
changed = TRUE;
}
Main:
/****************************************************************************
** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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 <qapplication.h>
#include "qwerty.h"
int main( int argc, char **argv )
{
QApplication a( argc, argv );
bool isSmall = qApp->desktop()->size().width() < 450
|| qApp->desktop()->size().height() < 450;
int i;
for ( i= argc <= 1 ? 0 : 1; i<argc; i++ ) {
Editor *e = new Editor;
e->setCaption("Qt Example - QWERTY");
if ( i > 0 )
e->load( argv[i] );
if ( isSmall ) {
e->showMaximized();
} else {
e->resize( 400, 400 );
e->show();
}
}
a.connect( &a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()) );
return a.exec();
}
See also Examples.
| Copyright © 2007 Trolltech | Trademarks | Qt 3.3.8
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