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|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/qwerty/qwerty.doc:4 -->
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<title>Simple editor that can load encodings</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Simple editor that can load encodings</h1>
<p>
<hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $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 <<a href="qwidget-h.html">qwidget.h</a>>
#include <<a href="qmenubar-h.html">qmenubar.h</a>>
#include <<a href="qmultilineedit-h.html">qmultilineedit.h</a>>
#include <<a href="qprinter-h.html">qprinter.h</a>>
class Editor : public <a href="qwidget.html">QWidget</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
Editor( <a href="qwidget.html">QWidget</a> *parent=0, const char *name="qwerty" );
~Editor();
void load( const <a href="qstring.html">QString</a>& 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( <a href="qresizeevent.html">QResizeEvent</a> * );
void closeEvent( <a href="qcloseevent.html">QCloseEvent</a> * );
private slots:
void saveAsEncoding( int );
void openAsEncoding( int );
void textChanged();
private:
bool saveAs( const <a href="qstring.html">QString</a>& fileName, int code=-1 );
void rebuildCodecList();
<a href="qmenubar.html">QMenuBar</a> *m;
<a href="qmultilineedit.html">QMultiLineEdit</a> *e;
#ifndef QT_NO_PRINTER
<a href="qprinter.html">QPrinter</a> printer;
#endif
<a href="qpopupmenu.html">QPopupMenu</a> *save_as;
<a href="qpopupmenu.html">QPopupMenu</a> *open_as;
bool changed;
};
#endif // QWERTY_H
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $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 <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qfile-h.html">qfile.h</a>>
#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
#include <<a href="qtextstream-h.html">qtextstream.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qpaintdevicemetrics-h.html">qpaintdevicemetrics.h</a>>
#include <<a href="qptrlist-h.html">qptrlist.h</a>>
#include <<a href="qfontdialog-h.html">qfontdialog.h</a>>
#include <<a href="qtextcodec-h.html">qtextcodec.h</a>>
const bool no_writing = FALSE;
static QPtrList<QTextCodec> *codecList = 0;
enum { Uni = 0, MBug = 1, Lat1 = 2, Local = 3, Guess = 4, Codec = 5 };
<a name="f235"></a>Editor::Editor( <a href="qwidget.html">QWidget</a> * parent , const char * name )
: <a href="qwidget.html">QWidget</a>( parent, name, WDestructiveClose )
{
m = new <a href="qmenubar.html">QMenuBar</a>( this, "menu" );
<a href="qpopupmenu.html">QPopupMenu</a> * file = new <a href="qpopupmenu.html">QPopupMenu</a>();
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( file );
<a name="x371"></a> m-><a href="qmenudata.html#insertItem">insertItem</a>( "&File", file );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&New", this, SLOT(newDoc()), ALT+Key_N );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Open...", this, SLOT(load()), ALT+Key_O );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Save...", this, SLOT(save()), ALT+Key_S );
<a name="x372"></a> file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
open_as = new <a href="qpopupmenu.html">QPopupMenu</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "Open &As", open_as );
save_as = new <a href="qpopupmenu.html">QPopupMenu</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "Sa&ve As", save_as );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "Add &Encoding", this, SLOT(addEncoding()) );
#ifndef QT_NO_PRINTER
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Print...", this, SLOT(print()), ALT+Key_P );
#endif
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Close", this, SLOT(<a href="qwidget.html#close">close</a>()),ALT+Key_W );
<a name="x358"></a> file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Quit", qApp, SLOT(<a href="qapplication.html#closeAllWindows">closeAllWindows</a>()), ALT+Key_Q );
<a name="x386"></a> <a href="qobject.html#connect">connect</a>( save_as, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)), this, SLOT(saveAsEncoding(int)) );
<a href="qobject.html#connect">connect</a>( open_as, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)), this, SLOT(openAsEncoding(int)) );
rebuildCodecList();
<a href="qpopupmenu.html">QPopupMenu</a> * edit = new <a href="qpopupmenu.html">QPopupMenu</a>();
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( edit );
m-><a href="qmenudata.html#insertItem">insertItem</a>( "&Edit", edit );
edit-><a href="qmenudata.html#insertItem">insertItem</a>( "To &Uppercase", this, SLOT(toUpper()), ALT+Key_U );
edit-><a href="qmenudata.html#insertItem">insertItem</a>( "To &Lowercase", this, SLOT(toLower()), ALT+Key_L );
#ifndef QT_NO_FONTDIALOG
edit-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
edit-><a href="qmenudata.html#insertItem">insertItem</a>( "&Select Font" , this, SLOT(<a href="qwidget.html#font">font</a>()), ALT+Key_T );
#endif
changed = FALSE;
e = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this, "editor" );
<a name="x400"></a> <a href="qobject.html#connect">connect</a>( e, SIGNAL( <a href="qtextedit.html#textChanged">textChanged</a>() ), 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.
//
<a name="x367"></a> <a href="qfont.html">QFont</a> unifont("unifont",16,50); unifont.<a href="qfont.html#setPixelSize">setPixelSize</a>(16);
<a name="x397"></a> e-><a href="qwidget.html#setFont">setFont</a>( unifont );
e-><a href="qwidget.html#setFocus">setFocus</a>();
}
Editor::~Editor()
{
}
<a name="x405"></a>void Editor::<a href="qwidget.html#font">font</a>()
{
#ifndef QT_NO_FONTDIALOG
bool ok;
<a name="x396"></a><a name="x368"></a> <a href="qfont.html">QFont</a> f = QFontDialog::<a href="qfontdialog.html#getFont">getFont</a>( &ok, e-><a href="qtextedit.html#font">font</a>() );
if ( ok ) {
e-><a href="qwidget.html#setFont">setFont</a>( f );
}
#endif
}
void <a name="f236"></a>Editor::rebuildCodecList()
{
delete codecList;
codecList = new <a href="qptrlist.html">QPtrList</a><QTextCodec>;
<a href="qtextcodec.html">QTextCodec</a> *codec;
int i;
<a name="x392"></a> for (i = 0; (codec = QTextCodec::<a href="qtextcodec.html#codecForIndex">codecForIndex</a>(i)); i++)
<a name="x387"></a> codecList-><a href="qptrlist.html#append">append</a>( codec );
<a name="x389"></a> int n = codecList-><a href="qptrlist.html#count">count</a>();
for (int pm=0; pm<2; pm++) {
<a href="qpopupmenu.html">QPopupMenu</a>* menu = pm ? open_as : save_as;
<a name="x370"></a> menu-><a href="qmenudata.html#clear">clear</a>();
<a href="qstring.html">QString</a> local = "Local (";
<a name="x393"></a> local += QTextCodec::<a href="qtextcodec.html#codecForLocale">codecForLocale</a>()->name();
local += ")";
menu-><a href="qmenudata.html#insertItem">insertItem</a>( local, Local );
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "Unicode", Uni );
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "Latin1", Lat1 );
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "Microsoft Unicode", MBug );
if ( pm )
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "[guess]", Guess );
for ( i = 0; i < n; i++ )
<a name="x388"></a> menu-><a href="qmenudata.html#insertItem">insertItem</a>( codecList-><a href="qptrlist.html#at">at</a>(i)->name(), Codec + i );
}
}
void <a name="f237"></a>Editor::newDoc()
{
Editor *ed = new Editor;
if ( qApp-><a href="qapplication.html#desktop">desktop</a>()->size().width() < 450
|| qApp-><a href="qapplication.html#desktop">desktop</a>()->size().height() < 450 ) {
<a name="x413"></a> ed-><a href="qwidget.html#showMaximized">showMaximized</a>();
} else {
ed-><a href="qwidget.html#resize">resize</a>( 400, 400 );
ed-><a href="qwidget.html#show">show</a>();
}
}
void <a name="f238"></a>Editor::load()
{
#ifndef QT_NO_FILEDIALOG
<a name="x365"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>( <a href="qstring.html#QString-null">QString::null</a>, QString::null, this );
<a name="x390"></a> if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() )
load( fn, -1 );
#endif
}
void Editor::load( const <a href="qstring.html">QString</a>& fileName, int code )
{
<a href="qfile.html">QFile</a> f( fileName );
<a name="x363"></a> if ( !f.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_ReadOnly</a> ) )
return;
<a name="x376"></a> e-><a href="qmultilineedit.html#setAutoUpdate">setAutoUpdate</a>( FALSE );
<a href="qtextstream.html">QTextStream</a> t(&f);
if ( code >= Codec )
<a name="x402"></a> t.<a href="qtextstream.html#setCodec">setCodec</a>( codecList-><a href="qptrlist.html#at">at</a>(code-Codec) );
else if ( code == Uni )
<a name="x403"></a> t.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::Unicode );
else if ( code == MBug )
t.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::UnicodeReverse );
else if ( code == Lat1 )
t.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::Latin1 );
else if ( code == Guess ) {
<a href="qfile.html">QFile</a> f(fileName);
f.<a href="qfile.html#open">open</a>(IO_ReadOnly);
char buffer[256];
int l = 256;
<a name="x364"></a> l=f.<a href="qiodevice.html#readBlock">readBlock</a>(buffer,l);
<a name="x391"></a> <a href="qtextcodec.html">QTextCodec</a>* codec = QTextCodec::<a href="qtextcodec.html#codecForContent">codecForContent</a>(buffer, l);
if ( codec ) {
<a name="x395"></a><a name="x373"></a> QMessageBox::<a href="qmessagebox.html#information">information</a>(this,"Encoding",QString("Codec: ")+codec-><a href="qtextcodec.html#name">name</a>());
t.<a href="qtextstream.html#setCodec">setCodec</a>( codec );
}
}
<a name="x401"></a><a name="x398"></a> e-><a href="qtextedit.html#setText">setText</a>( t.<a href="qtextstream.html#read">read</a>() );
<a name="x362"></a> f.<a href="qfile.html#close">close</a>();
e-><a href="qmultilineedit.html#setAutoUpdate">setAutoUpdate</a>( TRUE );
<a name="x407"></a> e-><a href="qwidget.html#repaint">repaint</a>();
<a href="qwidget.html#setCaption">setCaption</a>( fileName );
changed = FALSE;
}
void <a name="f239"></a>Editor::openAsEncoding( int code )
{
#ifndef QT_NO_FILEDIALOG
//storing filename (proper save) is left as an exercise...
<a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>( QString::null, QString::null, this );
if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() )
(void) load( fn, code );
#endif
}
bool <a name="f240"></a>Editor::save()
{
#ifndef QT_NO_FILEDIALOG
//storing filename (proper save) is left as an exercise...
<a name="x366"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>( QString::null, QString::null, this );
if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() )
return saveAs( fn );
return FALSE;
#endif
}
void <a name="f241"></a>Editor::saveAsEncoding( int code )
{
#ifndef QT_NO_FILEDIALOG
//storing filename (proper save) is left as an exercise...
<a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>( QString::null, QString::null, this );
if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() )
(void) saveAs( fn, code );
#endif
}
void <a name="f242"></a>Editor::addEncoding()
{
#ifndef QT_NO_FILEDIALOG
<a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>( QString::null, "*.map", this );
if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() ) {
<a href="qfile.html">QFile</a> f(fn);
if (f.<a href="qfile.html#open">open</a>(IO_ReadOnly)) {
<a name="x394"></a> if (QTextCodec::<a href="qtextcodec.html#loadCharmap">loadCharmap</a>(&f)) {
rebuildCodecList();
} else {
<a name="x374"></a> QMessageBox::<a href="qmessagebox.html#warning">warning</a>(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 <a name="f243"></a>Editor::saveAs( const <a href="qstring.html">QString</a>& fileName, int code )
{
<a href="qfile.html">QFile</a> f( fileName );
if ( no_writing || !f.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_WriteOnly</a> ) ) {
QMessageBox::<a href="qmessagebox.html#warning">warning</a>(this,"I/O Error",
QString("The file could not be opened.\n\n")
+fileName);
return FALSE;
}
<a href="qtextstream.html">QTextStream</a> t(&f);
if ( code >= Codec )
t.<a href="qtextstream.html#setCodec">setCodec</a>( codecList-><a href="qptrlist.html#at">at</a>(code-Codec) );
else if ( code == Uni )
t.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::Unicode );
else if ( code == MBug )
t.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::UnicodeReverse );
else if ( code == Lat1 )
t.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::Latin1 );
<a name="x399"></a> t << e-><a href="qtextedit.html#text">text</a>();
f.<a href="qfile.html#close">close</a>();
<a href="qwidget.html#setCaption">setCaption</a>( fileName );
changed = FALSE;
return TRUE;
}
void <a name="f244"></a>Editor::print()
{
#ifndef QT_NO_PRINTER
if ( printer.setup(this) ) { // opens printer dialog
printer.setFullPage(TRUE); // we'll set our own margins
<a href="qpainter.html">QPainter</a> p;
p.<a href="qpainter.html#begin">begin</a>( &printer ); // paint on printer
<a name="x385"></a> p.<a href="qpainter.html#setFont">setFont</a>( e-><a href="qtextedit.html#font">font</a>() );
<a name="x384"></a> <a href="qfontmetrics.html">QFontMetrics</a> fm = p.<a href="qpainter.html#fontMetrics">fontMetrics</a>();
<a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> metrics( &printer ); // need width/height
// of printer surface
<a name="x379"></a> const int MARGIN = metrics.<a href="qpaintdevicemetrics.html#logicalDpiX">logicalDpiX</a>() / 2; // half-inch margin
int yPos = MARGIN; // y position for each line
<a name="x375"></a> for( int i = 0 ; i < e-><a href="qmultilineedit.html#numLines">numLines</a>() ; i++ ) {
if ( printer.aborted() )
break;
<a name="x378"></a><a name="x369"></a> if ( yPos + fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>() > metrics.<a href="qpaintdevicemetrics.html#height">height</a>() - MARGIN ) {
// no more room on this page
if ( !printer.newPage() ) // start new page
break; // some error
yPos = MARGIN; // back to top of page
}
<a name="x380"></a> p.<a href="qpainter.html#drawText">drawText</a>( MARGIN, yPos, metrics.<a href="qpaintdevicemetrics.html#width">width</a>() - 2*MARGIN,
<a name="x377"></a> fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>(), ExpandTabs, e-><a href="qmultilineedit.html#textLine">textLine</a>( i ) );
yPos += fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>();
}
p.<a href="qpainter.html#end">end</a>(); // send job to printer
}
#endif
}
void Editor::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * )
{
if ( e && m )
e-><a href="qwidget.html#setGeometry">setGeometry</a>( 0, m-><a href="qwidget.html#height">height</a>(), width(), height() - m-><a href="qwidget.html#height">height</a>() );
}
<a name="x404"></a>void Editor::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a> *event )
{
<a name="x360"></a> event-><a href="qcloseevent.html#accept">accept</a>();
if ( changed ) { // the text has been changed
switch ( QMessageBox::<a href="qmessagebox.html#warning">warning</a>( this, "Qwerty",
"Save changes to Document?",
<a href="qobject.html#tr">tr</a>("&Yes"),
<a href="qobject.html#tr">tr</a>("&No"),
<a href="qobject.html#tr">tr</a>("Cancel"),
0, 2) ) {
case 0: // yes
if ( save() )
event-><a href="qcloseevent.html#accept">accept</a>();
else
<a name="x361"></a> event-><a href="qcloseevent.html#ignore">ignore</a>();
break;
case 1: // no
event-><a href="qcloseevent.html#accept">accept</a>();
break;
default: // cancel
event-><a href="qcloseevent.html#ignore">ignore</a>();
break;
}
}
}
void <a name="f245"></a>Editor::toUpper()
{
e-><a href="qtextedit.html#setText">setText</a>(e-><a href="qtextedit.html#text">text</a>().upper());
}
void <a name="f246"></a>Editor::toLower()
{
e-><a href="qtextedit.html#setText">setText</a>(e-><a href="qtextedit.html#text">text</a>().lower());
}
void <a name="f247"></a>Editor::textChanged()
{
changed = TRUE;
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $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 <<a href="qapplication-h.html">qapplication.h</a>>
#include "qwerty.h"
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
<a name="x414"></a> bool isSmall = qApp-><a href="qapplication.html#desktop">desktop</a>()->size().width() < 450
|| qApp-><a href="qapplication.html#desktop">desktop</a>()->size().height() < 450;
int i;
for ( i= argc <= 1 ? 0 : 1; i<argc; i++ ) {
Editor *e = new Editor;
e-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - QWERTY");
if ( i > 0 )
e->load( argv[i] );
if ( isSmall ) {
<a name="x422"></a> e-><a href="qwidget.html#showMaximized">showMaximized</a>();
} else {
e-><a href="qwidget.html#resize">resize</a>( 400, 400 );
e-><a href="qwidget.html#show">show</a>();
}
}
<a name="x416"></a> a.<a href="qobject.html#connect">connect</a>( &a, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), &a, SLOT(<a href="qapplication.html#quit">quit</a>()) );
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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<td>Copyright © 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt 3.3.8</div>
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