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156 lines
6.1 KiB
156 lines
6.1 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial2.doc:11 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>chart/chartform_files.cpp Example File</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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body { background: #ffffff; color: black; }
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--></style>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Grouped Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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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>chart/chartform_files.cpp Example File</h1>
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<pre>#include "canvasview.h"
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#include "chartform.h"
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#include <<a href="qfile-h.html">qfile.h</a>>
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#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <<a href="qprinter-h.html">qprinter.h</a>>
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#include <<a href="qstatusbar-h.html">qstatusbar.h</a>>
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void <a name="f172"></a>ChartForm::load( const <a href="qstring.html">QString</a>& filename )
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{
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<a href="qfile.html">QFile</a> file( filename );
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if ( !file.<a href="qfile.html#open">open</a>( IO_ReadOnly ) ) {
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "Failed to load \'%1\'" ).
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arg( filename ), 2000 );
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return;
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}
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init(); // Make sure we have colours
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m_filename = filename;
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<a href="qtextstream.html">QTextStream</a> ts( &file );
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Element element;
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int errors = 0;
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int i = 0;
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while ( !ts.<a href="qtextstream.html#eof">eof</a>() ) {
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ts >> element;
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if ( element.isValid() )
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m_elements[i++] = element;
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else
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errors++;
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if ( i == MAX_ELEMENTS ) {
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message(
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QString( "Read maximum number of elements (%1)"
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" discarding others" ).arg( i ), 2000 );
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break;
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}
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}
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file.<a href="qfile.html#close">close</a>();
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<a href="qstring.html">QString</a> bad = "";
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if ( errors ) {
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bad = QString( "; skipped " ) + QString::number( errors ) + " bad record";
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if ( errors > 1 )
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bad += "s";
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}
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "Read %1 values from \'%2\'%3" ).
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arg( i ).arg( filename ).arg( bad ), 3000 );
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<a href="qwidget.html#setCaption">setCaption</a>( QString( "Chart -- %1" ).arg( filename ) );
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updateRecentFiles( filename );
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drawElements();
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m_changed = FALSE;
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}
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void <a name="f173"></a>ChartForm::fileSave()
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{
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if ( m_filename.isEmpty() ) {
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fileSaveAs();
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return;
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}
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<a href="qfile.html">QFile</a> file( m_filename );
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if ( !file.<a href="qfile.html#open">open</a>( IO_WriteOnly ) ) {
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "Failed to save \'%1\'" ).
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arg( m_filename ), 2000 );
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return;
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}
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<a href="qtextstream.html">QTextStream</a> ts( &file );
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for ( int i = 0; i < MAX_ELEMENTS; ++i )
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if ( m_elements[i].isValid() )
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ts << m_elements[i];
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file.<a href="qfile.html#close">close</a>();
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<a href="qwidget.html#setCaption">setCaption</a>( QString( "Chart -- %1" ).arg( m_filename ) );
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "Saved \'%1\'" ).arg( m_filename ), 2000 );
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m_changed = FALSE;
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}
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void <a name="f174"></a>ChartForm::fileSaveAsPixmap()
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{
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<a href="qstring.html">QString</a> filename = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(
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QString::null, "Images (*.png *.xpm *.jpg)",
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this, "file save as bitmap",
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"Chart -- File Save As Bitmap" );
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if ( QPixmap::<a href="qpixmap.html#grabWidget">grabWidget</a>( m_canvasView ).
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save( filename,
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filename.<a href="qstring.html#mid">mid</a>( filename.<a href="qstring.html#findRev">findRev</a>( '.' ) + 1 ).upper() ) )
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "Wrote \'%1\'" ).arg( filename ), 2000 );
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else
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "Failed to write \'%1\'" ).
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arg( filename ), 2000 );
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}
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void <a name="f175"></a>ChartForm::filePrint()
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{
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if ( !m_printer )
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m_printer = new <a href="qprinter.html">QPrinter</a>;
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if ( m_printer-><a href="qprinter.html#setup">setup</a>() ) {
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<a href="qpainter.html">QPainter</a> painter( m_printer );
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m_canvas->drawArea( QRect( 0, 0, m_canvas->width(), m_canvas->height() ),
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&painter, FALSE );
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if ( !m_printer-><a href="qprinter.html#outputFileName">outputFileName</a>().isEmpty() )
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<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "Printed \'%1\'" ).
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arg( m_printer-><a href="qprinter.html#outputFileName">outputFileName</a>() ), 2000 );
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}
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}
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</pre><!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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