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Header file:
/**************************************************************************** ** $Id: qt/qwerty.h 3.1.2 edited Nov 8 10:35 $ ** ** 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. ** *****************************************************************************/ #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 3.1.2 edited Nov 8 10:35 $ ** ** 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 "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 3.1.2 edited Nov 8 10:35 $ ** ** 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 <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 © 2003 Trolltech | Trademarks | Qt version 3.1.2
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