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-rw-r--r--examples/qwerty/qwerty.cpp354
1 files changed, 354 insertions, 0 deletions
diff --git a/examples/qwerty/qwerty.cpp b/examples/qwerty/qwerty.cpp
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+/****************************************************************************
+**
+** Copyright (C) 1992-2008 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;
+}
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